WO2002031592A1 - Unite optique d"eclairage et ecran de projection comprenant cette unite - Google Patents
Unite optique d"eclairage et ecran de projection comprenant cette unite Download PDFInfo
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- WO2002031592A1 WO2002031592A1 PCT/JP2001/008697 JP0108697W WO0231592A1 WO 2002031592 A1 WO2002031592 A1 WO 2002031592A1 JP 0108697 W JP0108697 W JP 0108697W WO 0231592 A1 WO0231592 A1 WO 0231592A1
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- Prior art keywords
- light
- lens
- emitting surface
- light emitting
- relay
- Prior art date
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- 230000003287 optical effect Effects 0.000 title claims abstract description 270
- 238000005286 illumination Methods 0.000 title claims abstract description 107
- 238000005452 bending Methods 0.000 claims description 17
- 230000005540 biological transmission Effects 0.000 claims description 10
- 230000004907 flux Effects 0.000 claims description 8
- 239000011888 foil Substances 0.000 claims 2
- 239000004973 liquid crystal related substance Substances 0.000 description 20
- 238000010586 diagram Methods 0.000 description 18
- 238000003384 imaging method Methods 0.000 description 12
- 230000000694 effects Effects 0.000 description 6
- 230000004075 alteration Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/74—Projection arrangements for image reproduction, e.g. using eidophor
- H04N5/7416—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal
- H04N5/7441—Projection arrangements for image reproduction, e.g. using eidophor involving the use of a spatial light modulator, e.g. a light valve, controlled by a video signal the modulator being an array of liquid crystal cells
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0028—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed refractive and reflective surfaces, e.g. non-imaging catadioptric systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
- G02B27/095—Refractive optical elements
- G02B27/0955—Lenses
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/005—Projectors using an electronic spatial light modulator but not peculiar thereto
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/12—Picture reproducers
- H04N9/31—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM]
- H04N9/3102—Projection devices for colour picture display, e.g. using electronic spatial light modulators [ESLM] using two-dimensional electronic spatial light modulators
Definitions
- the present invention relates to an illumination optical device that can be used, for example, to illuminate a spatial light modulator, and a projection type device that can project an optical image formed on the spatial light modulator onto a screen by a projection lens.
- the present invention relates to a display device. Background art
- projection display devices using various spatial light modulators have been known as video devices for large screens. These include, for example, using a transmissive or reflective liquid crystal panel as a spatial light modulator, illuminating the liquid crystal panel with a light source, and forming an optical image on the liquid crystal panel in accordance with a video signal supplied from the outside, and projecting it. An optical image is enlarged and projected on a screen by a lens.
- Japanese Unexamined Patent Publication Nos. 3-111806 and 5-3465957 disclose an illumination optical device using an optical integrator and a glass opening. These devices form a light emitting surface similar in shape to the spatial light modulator, and realize high efficiency and high uniform illumination by forming an image on the spatial light modulator using a relay lens or the like. .
- the illumination optical system used in the projection display device may be used for illuminating a reflective spatial light modulation element, or performing off-axis shadowing, etc.
- the illumination light beam may be incident from a direction having a predetermined inclination.
- the illumination light flux imaged on the surface to be illuminated maintains the imaging conditions near the optical axis, but at a position far from the optical axis. In this case, since the imaging conditions are disrupted, it is difficult to efficiently focus light on an effective area on the irradiated surface.
- Scheimpflug's rule which is an imaging condition for an inclined object.
- this condition rule gives an imaging condition for two planes inclined with respect to each other, there is a problem in that a figure is distorted in the inclination direction of the irradiated surface and uneven brightness occurs. It was not a solution, but an essential problem with oblique lighting.
- FIG. 9A shows an example of a basic configuration of a conventional projection display device.
- Conventional projection display devices consist of a lamp 121, a concave mirror 122, a condenser lens 123, a light pulp 1.24, a first lens 125, an intermediate imaging surface 126, and a reflective mirror. 1 2 7, 2nd lens 1 2 8, screen 1 2 9.
- the light emitted from the lamp 122 is condensed by the concave mirror 122 to form a single light beam that is approximately rotationally symmetric with respect to the optical axis.
- the condensing lens 123 illuminates the entire area of the light pulp 124 with this single light beam, and illuminates the light passing through the light pulp 124 with the object-side focal point 125 of the first lens 125. Light is collected near the position a.
- the light valve 124 for example, a transmissive liquid crystal panel is used, and forms an optical image corresponding to a video signal.
- the first lens 125 forms an intermediate imaging surface 126 using light that has passed through the light pulp 12.
- the light condensed by the condenser lens 1 2 3 passes near the focal point 1 25 a position of the first lens 1 25, so that the light converges with the substantially parallel light including the intermediate image plane 1 2 6 Out of the first lens 1 25.
- the light pulp 1 24 and the intermediate image-forming surface 1 26 with respect to the optical axis 1 25 b of the first lens 1 25 form the light of the first lens 125 so as to satisfy the Scheimpflug condition. They are arranged inclined with respect to the axis 125b.
- the reflecting mirror 127 located near the intermediate imaging surface 126 is, for example, a two-dimensional array of minute reflecting surfaces 127a as shown in an enlarged view in FIG. 9 (b). Are used so that the light emitted from the first lens 125 can efficiently enter the second lens 128.
- the second lens 128 re-images the intermediate image plane 126 on the screen 129.
- the intermediate image plane 1 2 6 and the screen 1 2 9 are arranged so as to be inclined with respect to the optical axis 1 2 8 b of the second lens 1 2 8 so as to satisfy the Scheimpnorfe condition. ing.
- the graphic distortion generated by the first lens 125 can cancel the graphic distortion generated by the second lens 126, so that the light valve 122 is provided on the screen 125. 3 It is possible to form an image without conjugate with the optical image on it can. Further, there is an advantage that the loss of light in the optical path from the first lens 125 to the second lens 128 can be reduced by making the emitted light flux of the first lens 125 substantially parallel light.
- the projection-type display device shown in Fig. 9 solves the problem of figure distortion caused by oblique imaging and the problem of brightness gradient due to this, and efficiently guides the light emitted by the lamp onto the screen. This realizes a bright and distortion-free projected image. Therefore, if the above configuration is applied to an illumination optical system, it is possible to efficiently illuminate a spatial light modulation element inclined with respect to the optical axis, but there are the following problems. Specifically, when the Scheimpflug's conditional rule for oblique image formation is repeated twice, the optical axes of the first lens and the second lens are largely refracted, so that an optical path bending means is required. In Fig.
- this is achieved by arranging a micro-reflection mirror array in which micro-reflection mirrors are arranged two-dimensionally in the vicinity of the intermediate image plane, but since the intermediate image plane has a conjugate relationship with the screen. Then, an image of the edge of the micro-reflection mirror is formed on the screen.
- the light on the light pulp which is arranged at an angle to the optical axis of the light source, has a brightness Is asymmetrical with respect to. Since the brightness distribution on the light bulb is approximately reproduced on the screen by the action of the two-time image formation, an image having a brightness distribution asymmetric with respect to the optical axis is formed on the screen. That is, in the conventional illumination optical device or projection display device, There is a problem (second problem) that an image having an asymmetrical brightness distribution is formed on the screen. Disclosure of the invention
- An object of the present invention is to provide an illumination optical device and a projection display device in which an edge portion or the like of a minute reflection mirror of an optical path bending unit is not formed on a screen in consideration of the first problem. Is what you do.
- the present invention provides an illumination optical device and a projection display device in which an image having an asymmetric brightness distribution with respect to the optical axis is not formed on a screen in consideration of the second problem. It is intended to do so.
- a first present invention is an illumination optical device that illuminates an illumination target area that is obliquely inclined with respect to an optical axis, comprising: a light source;
- a relay system a relay optical system, wherein the relay optical system has the first light emitting surface and the second light emitting surface inclined with respect to an optical axis of the relay optical system substantially conjugate to each other;
- the light transmitting element is configured to form a first light emitting surface by calibrating a traveling direction of the incident light beam so that an emitted light beam is effectively incident on the relay optical system, and the first emission surface is the relay.
- An illumination optical device that forms the first emission surface so as to have a brightness gradient in a direction to cancel a brightness gradient generated in an optical system.
- the first illumination optical system includes an optical integrator element that makes a brightness distribution of the collected light flux substantially uniform.
- a third invention is the illumination optical device according to the second invention, wherein the optical integrator element includes a first lens array and a second lens array.
- the light transmission element is a decentered lens decentered with respect to an optical axis of the front illumination optical system, a biconvex lens, a refractive index distribution type lens, plastic
- the illumination optical device according to the first aspect of the present invention which is any one of a spherical lens, a Fresno-lens lens, and a prism element.
- a fifth invention (corresponding to claim 5) is the illumination optical device according to the fourth invention, wherein the eccentric lens has an aspherical surface.
- a sixth aspect of the present invention is the illumination optical device according to the first aspect of the present invention, further comprising an irradiation angle correction element near an incident side of the illuminated area.
- a seventh aspect of the present invention is an illumination optical device for illuminating an illuminated area obliquely inclined with respect to an optical axis,
- a condensing optical system that condenses the light emitted by the light source to form a single light beam and forms a first light emitting surface substantially orthogonal to the optical axis;
- a first relay optical system that forms a second light-emitting surface using light passing through the first light-emitting surface
- a second relay optical system that forms a third light emitting surface on the illuminated area using light passing through the second light emitting surface,
- the first relay optical system, the first light emitting surface and the second light emitting surface inclined with respect to the optical axis of the first relay optical system are substantially conjugate to each other,
- the second relay optical system, the second light emitting surface and the third light emitting surface inclined with respect to the optical axis of the second relay optical system are substantially conjugate to each other,
- the first relay optical system is configured to provide the first light emitting surface with a brightness gradient in a direction to cancel a brightness gradient generated in the second relay optical system to form the second light emitting surface.
- An optical device configured to provide the first light emitting surface with a brightness gradient in a direction to cancel a brightness gradient generated in the second relay optical system to form the second light emitting surface.
- An eighth aspect of the present invention (corresponding to claim 8) is that the optical path bending means for bending an optical path is arranged at least in the vicinity of the first light emitting surface or in the vicinity of the second light emitting surface.
- 7 is an illumination optical device according to the seventh aspect of the present invention.
- the optical path bending means is decentered with respect to the optical axis of the light-collecting optical system forming the first light-emitting surface.
- the eighth embodiment which is one of an eccentric lens, a biconvex lens, a gradient index lens, a plastic aspheric lens, a Fresnel lens, and a prism element decentered with respect to the optical axis of the relay optical system of 2,
- a tenth aspect of the present invention is the illumination optical device according to the ninth aspect of the present invention, wherein the eccentric lens has an aspheric surface.
- the eleventh invention is the illumination optical device according to the seventh invention, wherein an illumination angle correction element is provided near the incident side of the illuminated area.
- a twelfth aspect of the present invention includes an illumination optical device according to any one of the first to sixth aspects of the present invention,
- a spatial modulation element arranged substantially at the same position as the second light-emitting surface, forming an optical image according to the video signal; And a projection lens that projects an optical image of the spatial modulation element.
- claim 13 ⁇ is the illumination optical device according to any one of the seventh to eleventh aspects of the present invention.
- a spatial modulation element disposed substantially at the same position as the third light-emitting surface and forming an optical image according to a video signal
- a fourteenth invention is an illumination optical device according to any one of the seventh to eleventh inventions,
- a spatial light modulator that is disposed substantially at the same position as the first light emitting surface and forms an optical image according to a video signal
- the first relay lens system and the second relay lens system are projection-type display devices that project an optical image of the spatial modulation element onto a screen arranged on the illumination area.
- a fifteenth aspect of the present invention is a rotating mechanism in which color wheels that selectively transmit red, green, and blue light are arranged in a disk shape in the vicinity of the first light emitting surface. Equipped with a mold color wheel,
- a projection display apparatus for driving the spatial light modulation element in a color sequential manner.
- a sixteenth aspect of the present invention (corresponding to claim 16) is that a color wheel that selectively transmits red, green, and blue light is arranged in a disk shape in the vicinity of the second light emitting surface. Equipped with a mold color wheel, A thirteenth projection display device according to the present invention for driving the spatial light modulation element in a color sequential manner.
- FIG. 1 is a schematic configuration diagram illustrating an illumination optical device according to a first embodiment of the present invention.
- FIG. 2 is an optical path diagram for explaining the operation of the decentered lens in FIG.
- FIG. 3 is an optical path diagram for explaining the operation of the relay lens of FIG.
- FIG. 5 is a schematic configuration diagram illustrating an illumination optical device according to a third embodiment of the present invention.
- FIG. 6 is a schematic configuration diagram of an illumination optical device according to the fourth embodiment of the present invention.
- FIG. 7 is a schematic configuration diagram illustrating a projection display device according to a fifth embodiment of the present invention.
- FIG. 8 is a schematic configuration diagram illustrating a projection display device according to a sixth embodiment of the present invention.
- Figure 9 shows (a) is a schematic block diagram showing a configuration example of a conventional projection display device.
- FIG. 3B is a schematic enlarged configuration diagram illustrating a configuration of a minute reflection mirror. Explanation of reference numerals
- FIG. 1 is a diagram showing a configuration of an illumination optical device according to an embodiment of the present invention.
- the illumination optical device includes a lamp 1 as a light source, an ellipsoidal mirror 2, a UV-I cut filter 3, a condenser lens 4, a first lens 5, a second lens 6, a first light emitting surface 8, It comprises an eccentric lens 9 as a light transmission element, a second light emitting surface 10, a relay lens 11 as a relay optical system, a third light emitting surface 12, and an illuminated area 13.
- the optical system from the lamp 1 to the second lens 6 constitutes the front illumination optical system 7.
- the front illumination optical system 7 efficiently condenses the light emitted from the lamp 1 and forms a first light emitting surface 8 having an arbitrary shape. Specifically, the light emitted from the lamp 1 placed near the first focal point F 1 of the ellipsoidal mirror 2 is reflected by the ellipsoidal mirror 2, and the UV-IR filter 3 emits ultraviolet light and infrared light. After the light component is removed, the light is focused near the second focal point F 2 of the ellipsoidal mirror 2.
- the condenser lens 4 is arranged so that its focal position substantially coincides with the position of the second focal point F 2 of the ellipsoidal mirror 2, and transfers the light passing through the second focal point F 2 of the concave mirror 2 along the optical axis 14.
- the light is emitted as light traveling approximately in parallel.
- the first lens 5 condenses the incident parallel light on the second lens 6, and the second lens 6 forms a first light emitting surface 7 that is approximately conjugate with the main plane 5 a of the first lens 5.
- the first light emitting surface 8 is formed so as to be orthogonal to the optical axis 14. Therefore, if the opening of the first lens 5 is appropriately set, the first light emitting surface 8 having a desired shape can be formed.
- the brightness distribution of the first light emitting surface 8 is approximately equivalent to the main plane 5 a of the first lens 5, and the brightness is approximately symmetric with respect to the optical axis 14. Distribution.
- the first light emitting surface 8 has been described as being orthogonal to the optical axis 14, but the present invention is not limited to this, and the first light emitting surface 8 is not necessarily orthogonal to the optical axis 14. You don't have to.
- the brightness distribution of the first light emitting surface 8 has been described as being approximately symmetrical with respect to the optical axis 14.
- the present invention is not limited to this.
- the brightness distribution does not have to be symmetric about the optical axis 14.
- An eccentric lens 9 eccentric to the optical axis 14 of the second lens 6 is arranged near the incident side of the first light emitting surface 8.
- the eccentric lens 9 appropriately refracts the light emitted from the second lens 6 and effectively guides the light to the relay lens 11.
- the first light emitting surface 8 is provided with a brightness gradient that cancels the brightness gradient generated by the relay lens 11, and the second light emitting surface 10 inclined with respect to the optical axis 15 of the relay lens 11 is provided.
- the relay lens 11 uses the light that has passed through the second light emitting surface 10 to form a third light emitting surface 12 that is inclined with respect to the optical axis 15 in a direction opposite to the second light emitting surface 10.
- the illuminated area 13 is illuminated effectively.
- the brightness distribution on the illuminated area 13 is approximately equivalent to the first light emitting surface 8, ie, the main plane 5a of the first lens 5, and has a brightness distribution approximately symmetric with respect to the optical axis.
- FIG. 2 is an optical path diagram for explaining the operation of the eccentric lens 9.
- the decentered lens 9 is an aspherical glass lens having an aspheric surface on the light incident side and a flat outgoing side.
- the light emitted from the second lens 6 is effectively incident on the relay lens 11 and the first light emitting surface 7 Forming a second light emitting surface 10 having a brightness distribution different from c
- the optical axis 21 of the eccentric lens 9 is substantially parallel to the optical axis 15 of the relay lens 11 and is positioned with respect to the optical axis 14 so as to pass near the principal point 6 a of the second lens 6. Properly eccentric.
- the light that has passed through the principal point 6a of the second lens 6 and entered the eccentric lens 9 is emitted as light that travels approximately parallel along the optical axis 15 of the relay lens 11.
- the light that has passed through the second lens can be effectively made incident on the relay lens.
- the eccentric lens 9 imparts a brightness gradient to the first light emitting surface 8 formed on the optical axis 14 of the second lens 6, and forms the second light emitting surface 10 at a position different from that.
- the second light emitting surface 10 is arranged with a predetermined inclination with respect to the optical axis 15 of the relay lens 11, and the first light emitting surface 8, that is, the brightness on the main plane 5 a of the first lens 5. It has a distribution different from the height distribution.
- the parallel luminous flux 20 incident on the first lens 5 is divided at equal intervals, and the divided light beams are denoted as Ll, L2, L3, L4, L5 .
- the light beam L3 corresponds to the optical axis 14 of the second lens 6.
- the intervals between the light beams after division are S1, S2, S3, and S4.
- the distance between the light beams L1, L2, L3, L4, and L5 on the second light emitting surface 10 is If S l ', S 2', S 3 ', and S 4', then S 4 '> S 3'> S 2 '> S 1'.
- Light rays included in S 1 on the main plane 5 a are included in S 1 ′ on the second light emitting surface 10.
- the rays contained in S2, S3, and S4 on the main plane 5a are
- FIG. 3 is an optical path diagram for explaining the operation of the relay lens 11.
- the relay lens 11 forms a third light emitting surface 12 conjugate with the second light emitting surface 10 in the vicinity of the illuminated region 13.
- the second light-emitting surface 10 and the third light-emitting surface 12 are both arranged to be inclined with respect to the optical axis 15 of the relay lens 11.
- the second light emitting surface 10 and the third light emitting surface 12 are arranged at the imaging positions A 1 and A 2 of the relay lens 11, and the extension line 3 of the second light emitting surface 10 is formed. 1 and the extension line 32 of the third light emitting surface 12 intersect at a point O on a line 33 passing through the principal point 11 a of the relay lens 11 and perpendicular to the optical axis 15.
- the second light emitting surface 10 inclined with respect to the optical axis 15 can be imaged on the third light emitting surface 12. This is called the so-called “Scheimpflug relation” and provides necessary and sufficient imaging conditions for an inclined object.
- the light passing from the point P1 through the principal point 11a of the relay lens 11 and reaching the third light emitting surface 12 is defined as L1 '.
- light passing through the principal point 11a of the relay lens 11 from the points P2, P3, P4, and P5 and reaching the third light emitting surface 12 is L2 ', L3', and L4, respectively.
- ', L 5' As shown in Fig. 2, the interval between points is S 4 ' > S 3 ′> S 2 ′> S l ′.
- the focal length of the eccentric lens 9 should be set so that its focal position approximately coincides with the principal point 6a of the second lens 6.
- the amount of eccentricity of the eccentric lens 9 may be set so that the optical axis 21 is substantially parallel to the optical axis 15 of the relay lens 11.
- the eccentric lens 9 imparts a gradient to the brightness distribution of the first light emitting surface 8 formed by the front illumination optical system 7, and the gradient is a brightness gradient generated by the relay lens 11 Is set to approximately cancel out. Accordingly, the brightness distribution of the illuminated area 13 inclined with respect to the optical axis 15 of the relay lens 11 is approximately equal to the brightness distribution of the first light emitting surface 8 formed by the front illumination optical system 7. can do. For example, by forming the first light emitting surface 8 with uniform brightness by the front illumination optical system 7, the brightness distribution of the illuminated area 13 can be made substantially uniform. ' ⁇
- the second light emitting surface of the present embodiment is an example of the first light emitting surface of the present invention
- the third light emitting surface of the present embodiment is an example of the second light emitting surface of the present invention.
- the front illumination optical system of the present invention is not limited to front illumination optical system 7 having the configuration shown in FIG. 1 in the present embodiment.
- the pre-illumination optical system of the present invention only needs to condense the light emitted by the lamp and form a predetermined light emitting surface.
- the first light-emitting surface of the present invention is not limited to the one orthogonal to the optical axis 14 like the first light-emitting surface 10 in the present embodiment, but is always orthogonal to the optical axis 14. It is not necessary. Further, the brightness distribution does not need to be symmetrical with respect to the optical axis 14, and may have an asymmetrical brightness distribution with respect to the optical axis 14. In short, the same effect can be obtained if the eccentric lens is set so as to satisfy the above operation.
- the shape and the amount of eccentricity of the light transmission element of the present invention are not limited to those satisfying the above-described conditions, like the eccentric lens 9 in the present embodiment.
- the light transmission element of the present invention only needs to have an effect of refracting incident light to form a second light emitting surface that can substantially cancel the brightness gradient generated by the relay lens.
- the light transmission element of the present invention is not limited to a light transmission element such as the decentered lens according to the present embodiment that converts outgoing light into parallel light. It is only necessary to provide a desired brightness gradient to the second light emitting surface, reduce the spread of light emitted from the second lens, and make the light enter the relay lens effectively.
- the light transmission element of the present invention is not limited to the eccentric lens 9 in the present embodiment, but may be a biconvex lens, a gradient index lens, a plastic aspheric lens, a Fresnel lens, or the like. In some cases, a prism element or the like can be used. .
- the main plane 5a of the first lens 5 and the second light emitting surface 10 of the present embodiment need not be conjugate. For example, a field stop may be arranged on the exit side of the eccentric lens to form the second light emitting surface.
- the relay optical system of the present invention is not limited to the relay lens 11 of the present embodiment, but, in other words, the relay optical system of the present invention, such as one composed of a plurality of lenses, comprises a second light emitting surface and a second light emitting surface. (3) It is only necessary that the light emitting surface has a conjugate relationship.
- the second light emitting surface 10 is arranged inclined with respect to the optical axis of the relay lens 11, but this is an example of a relay lens in which aberration is sufficiently corrected. Therefore, for example, when a relay lens having a large curvature of field is used, the optimum imaging plane of the relay lens may be set to the second light emitting surface in accordance with the aberration, and in some cases, the second light emitting surface May be arranged perpendicular to the optical axis.
- FIG. 4A is a diagram illustrating a configuration of an illumination optical device according to an embodiment of the present invention.
- the illumination optical device includes a lamp 41 as a light source, a parabolic mirror 42 as a condenser optical system, a UV-IR cut filter 43, and a first optical path bending.
- a first Fresnel lens 44 as an element, a first light emitting surface 45, a first as a first relay lens system]) a ray lens 46, a second Fresnel lens 47 as a second optical path bending element, a second It comprises a second light emitting surface 48, a second relay lens 49 as a second relay lens system, a third light emitting surface 50, and an illuminated area 51.
- the light emitted from the lamp 41 is condensed by the parabolic mirror 42, and the UV-IR cut filter 43 removes ultraviolet light and infrared light components.
- the parallel light incident on the first Fresnel lens is converged to form a first light emitting surface 45.
- the first relay lens 46 makes the first light emitting surface 45 and the second light emitting surface 47 inclined with respect to the optical axis 53 conjugate to each other. Specifically, the first light-emitting surface 45 and the second light-emitting surface 47 are arranged at the image forming positions B 1 and B 2 of the first relay lens 46, and the extension line 55 of the first light-emitting surface 45. An extension line 57 of the second light emitting surface 48 intersects with a point Q on a line 56 passing through the principal point 46 a of the first relay lens 46 and perpendicular to the optical axis 53.
- the second relay lens 49 causes the second light emitting surface 48 and the third light emitting surface 50 inclined with respect to the optical axis 54 to be conjugate to each other.
- the second light-emitting surface 48 and the third light-emitting surface 50 are arranged at the image forming positions C 1 and C 2 of the second relay lens 49, and the extension line 57 of the second light-emitting surface 48 and It intersects the extension line 59 of the third light-emitting surface 50 with the force S and the point Q on the line 58 passing through the principal point 49a of the second relay lens 49 and perpendicular to the optical axis 54.
- FIG. 4 (a) shows an example in which the extension line 56 and the extension line 58 intersect at the same point Q, this is not necessary.
- the first Fresnel lens 44 focuses parallel light emitted from the parabolic mirror 42 on the principal point 46 a of the first relay lens 46, as shown in an enlarged sectional view in FIG. 4B. You. Therefore, the first Fresnel lens 44 is decentered with respect to the optical axis 52 of the parabolic mirror 42. Specifically, the optical axis 44 a of the first Fresnel lens 44 is approximately parallel to the optical axis 52 of the parabolic mirror 42 and passes through the principal point 46 a of the first relay lens 46. Eccentric.
- the second Fresnel lens 47 is used to make the light emitted from the first relay lens 46 effectively enter the second relay lens 49.
- the second Fresnel lens 47 has a focal point on the incident side near the principal point 46a of the first relay lens 46, and a focal point on the exit side having the principal point 49 of the second relay lens 49. It is eccentric so that it is near a. ,
- the inclination of the brightness generated by the second relay lens 49 can be canceled by the inclination of the brightness generated by the first relay lens 46 c.
- the brightness distribution of 0 and the brightness distribution of the first light emitting surface 45 can be made substantially equal.
- the optical path bending means of the present invention is not limited to the shape and the amount of eccentricity which satisfy the above-mentioned conditions as in the first Fresnel lens 44 and the second Fresnel lens 47 in the present embodiment.
- the optical path bending means only needs to have an effect of refracting the incident light to form a second light emitting surface capable of substantially canceling out the brightness gradient generated in the second relay lens.
- the optical path bending means of the present invention is not limited to the first Fresnel lens 44 and the second Fresnel lens 47 of the present embodiment, which are not limited to those for making outgoing light into parallel light, but for making outgoing light into parallel light. In short, the optical path folding of this embodiment is not necessary.
- the bending means may provide a desired brightness gradient to the second light emitting surface, reduce the spread of light emitted from the second lens, and allow the light to be effectively incident on the relay lens.
- the optical path bending means of the present invention is not limited to the first Fresnel lens 44 and the second Fresnel lens 47 in the present embodiment, and the eccentric lens may be a biconvex lens, a gradient index lens, a plastic aspherical surface. A lens, and in some cases, a prism element or the like may be used.
- the first relay optical system of the present invention is not limited to the first relay lens 46 in the present embodiment, but may be constituted by a plurality of lenses. In short, the first relay optical system of the present invention only needs to make the first light-emitting surface and the second light-emitting surface have a substantially cooperative relationship.
- the second relay optical system of the present invention is not limited to the second relay lens 49 in the present embodiment, but may be configured by a plurality of lenses.
- the second relay optical system of the present invention only needs to make the second light emitting surface and the third light emitting surface have a substantially conjugate relationship.
- FIG. 5 is a diagram showing a configuration of an illumination optical device according to an embodiment of the present invention.
- the illumination optical device of the present embodiment includes a lamp 61 as a light source, a parabolic mirror 62, a UV-IR cut filter 63, a first lens array 64, and a second lens array.
- An optical system from the lamp 61 to the auxiliary lens 66 constitutes a front illumination optical system 67.
- the light emitted by the lamp 61 is reflected by the parabolic mirror 62 and converted into light that travels approximately parallel along the optical axis 75.
- the light emitted from the parabolic mirror 62 has its UV and infrared components removed by the UV-IR cut filter 63, and enters the first lens array 64.
- the first lens array 64 is configured by arranging the first lenses 64 two-dimensionally.
- the incident light beam is divided into a plurality of minute light beams, and each of the minute light beams is focused on the second lens array 65.
- the second lens array 65 is configured by arranging the second lens 65 a paired with the first lens 64 two-dimensionally, and expanding or minimizing the minute light beam incident on the corresponding first lens 64 a.
- the first light emitting surface 68 is formed in a superimposed form by reduction. As a result of superimposing a plurality of minute light fluxes having relatively small brightness unevenness and color unevenness, the brightness distribution on the first light emitting surface 68 becomes extremely uniform.
- the auxiliary lens 66 is used to superimpose the light passing through the second lens 65a on the first light emitting surface 68.
- the eccentric lens 69 applies a direction to cancel the brightness gradient generated by the relay lens 71 with respect to the brightness distribution of the first light emitting surface 68.
- a second light-emitting surface 70 having the brightness of 10 nm is formed.
- the second light emitting surface 70 forms a third light emitting surface 72 near the illuminated area 73 by the relay lens 71.
- the brightness distribution of the third light emitting surface 73 is obtained by superimposing the brightness distribution obtained by the plurality of first lenses 64a and the second lenses 65a, it is extremely uniform.
- the second lens array 65 may be configured by arranging the appropriately decentered second lens on the two-dimensional element.
- illumination angle compensation lens 8 1 is a diagram showing a configuration of an illumination optical device according to an embodiment of the present invention is the same as that shown in FIG.
- the irradiation angle correction lens 81 acts on the light that forms the third light emitting surface 72 and emits the incident light as light that travels approximately parallel along the optical axis 74. Therefore, a parallel light beam having a certain angle enters the illuminated area.
- This is effective, for example, when illuminating a spatial light modulation element having different transmittance and reflectance depending on the incident angle of light.
- the aberration generated by the irradiation angle correction lens 81 is preferably corrected by the relay lens 71.
- the illumination optical device can uniformly illuminate the illuminated area inclined with respect to the optical axis with a parallel light beam having a predetermined angle. Can be realized. (Fifth embodiment)
- FIG. 7 is a diagram showing a configuration of a projection display device according to an embodiment of the present invention.
- the projection display device of the present embodiment includes an illumination optical device 91, a reflective liquid crystal panel 92, a projection lens 93, and a screen 94.
- the illumination optical device 91 is the same as the illumination optical device shown in FIG.
- the illumination optical device 91 forms a highly uniform parallel light beam by the operation described in the fourth embodiment, and illuminates the reflective liquid crystal panel 92.
- the reflection type liquid crystal panel 92 forms an optical image by modulating and reflecting incident light according to a video signal.
- the optical image on the reflective liquid crystal panel 92 is projected on a screen 94 by a projection lens 93.
- the projection lens 93 sufficiently corrects the aberration generated by the irradiation angle correction lens 81, and can form an optical image on the reflection type liquid crystal panel 92 on the screen 94 with high resolution.
- the irradiation angle correction lens 81 By arranging the irradiation angle correction lens 81, it is possible to reduce the spread of the light reflected by the reflective liquid crystal panel 92 and make the light enter the projection lens, and thus there is an advantage that the projection lens can be downsized. .
- the opening shape of the first lens 64 a on the first lens array 64 is made substantially similar to the effective display area of the liquid crystal panel 92, it is unnecessary to illuminate the area other than the effective display area of the liquid crystal panel 92. Since the light can be reduced, the contrast of the projected image is improved.
- the illumination angle correction lens 8 1 When illuminating a reflective spatial light modulator, the illumination angle correction lens 8 1 May be a plano-convex lens having a convex surface on the spatial light modulator 92 side. Unnecessary reflected light is prevented from re-entering the spatial light modulator 92, and the contrast is further improved.
- the color wheel may be arranged near the second light emitting surface 70. In the vicinity of the second light emitting surface 70, a parallel light beam having a small width can be formed, so that the wavelength shift due to the incident angle dependence of the color filter is reduced.
- the spatial light modulator of the present invention is not limited to the reflective liquid crystal panel 92 of the present embodiment, but may be a transmissive liquid crystal panel or a mirror-type device that modulates light with a plurality of minute mirrors. Good.
- the spatial light modulation element inclined with respect to the optical axis can be efficiently and uniformly illuminated, so that a bright, high-quality image can be obtained.
- a projection display device can be realized.
- FIG. 8 is a diagram showing a configuration of a projection display apparatus according to an embodiment of the present invention.
- the projection type display device includes an illumination optical device 101, a reflection type liquid crystal panel. It consists of a lens 102, a projection lens 103, a screen 104, and a force.
- the illumination optical device 101 is the same as the illumination optical device shown in FIG.
- the reflective liquid crystal panel 102 is illuminated by a parallel light beam having no brightness gradient formed by the illumination optical device 101.
- An optical image formed on the reflective liquid crystal panel 102 is projected on a screen 104 by a projection lens 103.
- the projection lens 103 has a sufficiently large image circle, and can perform off-axis projection. Thus, oblique projection can be performed without causing distortion on the screen 104.
- the spatial light modulator 102 inclined with respect to the optical axis can be efficiently and uniformly illuminated, so that a bright and high-quality image can be obtained.
- a projection display device that can be obtained can be realized.
- this transmissive liquid crystal panel forms an optical image by modulating incident light according to a video signal and transmitting the modulated light, and the first relay lens 46 and the second relay lens 4 are formed.
- Reference numeral 9 also functions as a projection lens that projects the optical image formed by the liquid crystal panel onto a screen disposed on the third light emitting surface 50.
- an illumination optical device capable of illuminating an illuminated area by condensing well can be realized. Further, it is possible to realize a projection display device capable of displaying a bright image without uneven brightness with high image quality.
- the present invention can provide an illumination optical device and a projection display device in which an edge portion or the like of a minute reflection mirror of an optical path bending unit is not formed on a screen.
- the present invention can provide an illumination optical device and a projection display device in which an image having an asymmetric brightness distribution with respect to the optical axis is not formed on the screen.
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2002534919A JP3680999B2 (ja) | 2000-10-06 | 2001-10-03 | 照明光学装置及びこれを用いた投写型表示装置 |
US10/148,828 US6761457B2 (en) | 2000-10-06 | 2001-10-03 | Optical illumination device and projection display device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2000-307388 | 2000-10-06 | ||
JP2000307388 | 2000-10-06 |
Publications (1)
Publication Number | Publication Date |
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WO2002031592A1 true WO2002031592A1 (fr) | 2002-04-18 |
Family
ID=18787914
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2001/008697 WO2002031592A1 (fr) | 2000-10-06 | 2001-10-03 | Unite optique d"eclairage et ecran de projection comprenant cette unite |
Country Status (4)
Country | Link |
---|---|
US (1) | US6761457B2 (ja) |
JP (1) | JP3680999B2 (ja) |
CN (1) | CN1232882C (ja) |
WO (1) | WO2002031592A1 (ja) |
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JP2006058859A (ja) * | 2004-07-23 | 2006-03-02 | Kazuji Yoshida | 画像表示装置 |
JP2011059317A (ja) * | 2009-09-09 | 2011-03-24 | Mitsubishi Electric Corp | 投写型表示装置 |
JP2011248365A (ja) * | 2011-05-30 | 2011-12-08 | Hitachi Ltd | 投写型映像表示装置 |
JP2018004817A (ja) * | 2016-06-29 | 2018-01-11 | 株式会社リコー | 画像表示装置およびヘッドアップディスプレイシステム |
WO2022019012A1 (ja) * | 2020-07-21 | 2022-01-27 | 浜松ホトニクス株式会社 | 光学装置 |
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KR20030018740A (ko) | 2001-08-31 | 2003-03-06 | 삼성전자주식회사 | 투사 장치 |
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US6793342B1 (en) * | 2003-04-15 | 2004-09-21 | Infocus Corporation | Reduced form factor projection system |
US7055969B2 (en) * | 2004-04-29 | 2006-06-06 | Hewlett-Packard Development Company, L.P. | Reflective optical assembly |
US7399086B2 (en) * | 2004-09-09 | 2008-07-15 | Jan Huewel | Image processing method and image processing device |
WO2006090386A2 (en) * | 2005-02-24 | 2006-08-31 | Vkb Inc. | A virtual keyboard device |
TWI286658B (en) * | 2005-06-20 | 2007-09-11 | Delta Electronics Inc | Light integration module and lamps module for the projector system |
CN100412612C (zh) * | 2005-07-01 | 2008-08-20 | 台达电子工业股份有限公司 | L形光机用双灯架构 |
US7695146B2 (en) * | 2005-10-24 | 2010-04-13 | Hewlett-Packard Development Company, L.P. | Projection assembly |
JP2007193136A (ja) * | 2006-01-19 | 2007-08-02 | Toshiba Corp | 投射型画像表示装置および投射型画像表示システム |
US7507942B2 (en) * | 2006-06-13 | 2009-03-24 | Ricoh Company, Ltd. | Illumination apparatus that suppresses light intensity distribution irregularity and projection-type display apparatus using the illumination apparatus |
US20080151199A1 (en) * | 2006-12-21 | 2008-06-26 | Bao-Gang Wu | Projection display system of quasi-axial optical imagery |
JP2012118382A (ja) * | 2010-12-02 | 2012-06-21 | Panasonic Liquid Crystal Display Co Ltd | 液晶表示装置 |
WO2012090108A1 (en) * | 2010-12-30 | 2012-07-05 | Koninklijke Philips Electronics N.V. | A lens and a lighting apparatus comprising such a lens. |
CN102147532B (zh) * | 2011-03-26 | 2012-06-27 | 电子科技大学 | 一种投影仪用光学引擎 |
DE102011119565A1 (de) * | 2011-05-16 | 2012-11-22 | Limo Patentverwaltung Gmbh & Co. Kg | Beleuchtungsvorrichtung |
DE102013012727B3 (de) * | 2013-08-01 | 2014-07-17 | Jenoptik Optical Systems Gmbh | Verfahren zur Optimierung einer Intensität einer Nutzlichtverteilung |
JP6128008B2 (ja) * | 2013-08-26 | 2017-05-17 | ソニー株式会社 | 投射型表示装置 |
US9686517B2 (en) * | 2014-12-15 | 2017-06-20 | Test Research, Inc. | Optical system and image compensating method of optical apparatus |
JP7122244B2 (ja) * | 2018-12-21 | 2022-08-19 | 株式会社日立エルジーデータストレージ | ヘッドマウントディスプレイ |
US11221545B2 (en) * | 2018-12-26 | 2022-01-11 | Datalogic Usa, Inc. | Distributed focal conjugate multiple indication system for long range applications |
JP7340789B2 (ja) * | 2019-05-29 | 2023-09-08 | パナソニックIpマネジメント株式会社 | 光学系、画像投写装置および撮像装置 |
CN112856329B (zh) * | 2019-11-28 | 2024-02-20 | 扬明光学股份有限公司 | 迎宾灯 |
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Also Published As
Publication number | Publication date |
---|---|
CN1398361A (zh) | 2003-02-19 |
CN1232882C (zh) | 2005-12-21 |
US20030128342A1 (en) | 2003-07-10 |
US6761457B2 (en) | 2004-07-13 |
JP3680999B2 (ja) | 2005-08-10 |
JPWO2002031592A1 (ja) | 2004-02-19 |
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