CN104076493A - Projector - Google Patents

Projector Download PDF

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Publication number
CN104076493A
CN104076493A CN201410198649.9A CN201410198649A CN104076493A CN 104076493 A CN104076493 A CN 104076493A CN 201410198649 A CN201410198649 A CN 201410198649A CN 104076493 A CN104076493 A CN 104076493A
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CN
China
Prior art keywords
lens
projection
screen
projection arrangement
image
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201410198649.9A
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Chinese (zh)
Other versions
CN104076493B (en
Inventor
林明坤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qisda Optronics Suzhou Co Ltd
Qisda Corp
Original Assignee
Qisda Optronics Suzhou Co Ltd
Qisda Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qisda Optronics Suzhou Co Ltd, Qisda Corp filed Critical Qisda Optronics Suzhou Co Ltd
Priority to CN201410198649.9A priority Critical patent/CN104076493B/en
Priority to CN201610352738.3A priority patent/CN105911678B/en
Publication of CN104076493A publication Critical patent/CN104076493A/en
Application granted granted Critical
Publication of CN104076493B publication Critical patent/CN104076493B/en
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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses

Abstract

The invention provides a projector which is used for projecting an image onto a screen. The projector comprises a light source used for providing light, an imaging unit used for receiving the light, and a projection lens arranged between the imaging unit and the screen to project the light onto the screen, wherein the projection lens comprises a first lens assembly and a second lens assembly, the first lens assembly is close to the screen and comprises a first lens, a second lens and a third lens, the first lens, the second lens and the third lens all have negative diopters, the first lens is an aspherical lens close to the screen, the second lens is located between the first lens and the third lens, the second lens assembly has a positive diopter and is close to the imaging unit, the effective focal distance of the projection lens is f, the focal distance of the first lens assembly is f[G1], the focal distance of the first lens is f[L1], the focal distance of the second lens is f[L2], the focal distance of the third lens is f[L3], 0.75<=/f[G1]//f<=1.28, and the relationship between f[L1], f[L2] and f[L3] meets the inequation as described in the specification.

Description

Projection arrangement
Technical field
The invention provides a kind of projection arrangement, espespecially a kind of projection arrangement with short out-of-focus projection camera lens.
Background technology
Along with scientific and technological progress, projector is commonly used to show image data in meeting bulletin.In order to coordinate the place size of meeting room, ultrashort Jiao's the projection lens advantage easily that is easy to carry and focuses with it becomes the market mainstream gradually.Tradition projection lens is to utilize secondary imaging technology to reach short burnt effect, yet its cost is expensive, therefore how to design the short out-of-focus projection camera lens of the cheap and tool volume production advantage of a kind of cost, is just one of developing goal of related optical camera lens industry.
Summary of the invention
The invention provides a kind of projection arrangement with short out-of-focus projection camera lens, to address the above problem.
On the one hand, the invention provides a kind of projection arrangement, be used for projecting image to screen, this projection arrangement includes:
Light source, provides light;
Image-generating unit, receives this light; And
Projection lens, is arranged between this image-generating unit and this screen, and in order to project this light to this screen, this projection lens comprises:
First lens group, contiguous this screen, this first lens group comprises and has negative dioptric first lens, the second lens and the 3rd lens, and this first lens is for being close to the non-spherical lens of this screen, and these second lens are between this first lens and the 3rd lens; And
The second lens combination, has positive diopter and contiguous this image-generating unit;
Wherein, the effective focal length of this projection lens is f, and the focal length of this first lens group is f g1, the focal length of this first lens is f l1, the focal length of these the second lens is f l2, the focal length of the 3rd lens is f l3, and 0.75≤| f g1|/f≤1.28, | 1 f L 1 + 1 f L 2 | > | 1 f L 3 | .
Preferably, the effective focal length f of this projection lens also meets the restriction of 5.0mm≤f≤7.0mm.
Preferably, the focal distance f of this first lens group g1also meet-8mm≤f g1the restriction of≤-4mm.
Preferably, rear Jiao of this projection lens is f bfl, and 18mm≤f bfl≤ 32mm.
Preferably, this projection lens is non-telecentric system.
Preferably, the 3rd lens are biconcave lens.
Preferably, this second lens combination comprises the 4th lens and the 5th lens, the non-spherical lens that the 4th lens are glass material, and the 5th lens are the balsaming lens between the 4th lens and this image-generating unit.
Preferably, the 5th lens are cemented doublet or the single element lens with achromatism function.
Preferably, this projection lens also comprises the 3rd lens combination, and the 3rd lens combination is arranged between this first lens group and this second lens combination, the focusing lens group that the 3rd lens combination is this projection lens.
Preferably, the lens numbers of this projection lens is more than or equal to 8 and be less than or equal to 12.
The present invention designs the projection lens of a non-telecentric system, usings the first lens of non-spherical lens as projection lens.The present invention utilizes non-spherical lens to be modified to the optical aberrations such as image distortion, aberration, not only can effectively improve the image quality of projection arrangement, more can significantly reduce the lens numbers of projection lens, to meet price and the volume production advantage of product.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the projection arrangement of the embodiment of the present invention;
Fig. 2 is the part-structure schematic diagram of the projection arrangement of the embodiment of the present invention;
Fig. 3 to Fig. 7 is that the projection lens of the embodiment of the present invention is in the configuration schematic diagram of different first lens groups;
Fig. 8 is each lens aberration simulation drawing of the projection lens of the embodiment of the present invention;
Fig. 9 is filed curvature and the image deformation simulation drawing of the projection lens of the embodiment of the present invention;
Figure 10 is the lateral chromatic aberration simulation drawing of the projection lens of the embodiment of the present invention;
Figure 11 is the modulation transfer function simulation drawing of the projection lens of the embodiment of the present invention.
Embodiment
For making that object of the present invention, structure, feature and function thereof are had to further understanding, hereby coordinate embodiment to be described in detail as follows.
Refer to Fig. 1, the schematic diagram of the projection arrangement 10 that Fig. 1 is the embodiment of the present invention.Projection arrangement 10 is used for projecting image to screen 12.Projection arrangement 10 comprises light source 14, image-generating unit 16, projection lens 18, filter unit 20 and reflecting element 22.Light source 14 output light, filter unit 20 receives light and light is filtered into a plurality of coloured light, and the light after filter unit 20 is processed is reflected element 22 reflections and is received by image-generating unit 16.Image-generating unit 16 receives from a plurality of coloured light of reflecting element 22 and is delivered to projection lens 18.Projection lens 18 is arranged between image-generating unit 16 and screen 12, by the ray cast from image-generating unit 16 to screen 12.At digit optical, process (DLP tM) in projector, filter unit 20 is colour wheel, image-generating unit 16 is digital minitype reflector (Digital Micromirror Device, DMD), reflecting element 22 is concave mirror.In liquid crystal projector, filter unit 20 is optical filters, and reflecting element 22 is mirror surfaces, and image-generating unit 16 is liquid crystal panels.
Refer to Fig. 2, the part-structure schematic diagram of the projection arrangement 10 that Fig. 2 is the embodiment of the present invention.Projection lens 18 comprises first lens group 24 and the second lens combination 26.First lens group 24 adjacent screens 12 (being thing side), the contiguous image-generating unit 16 (as side) of the second lens combination 26.First lens group 24 has negative diopter and in order to divergent rays.The second lens combination 26 has positive diopter and in order to polymerization light.First lens group 24 comprises and has negative dioptric first lens 28, the second lens 30 and the 3rd lens 32.First lens 28 is non-spherical lenses of adjacent screen 12 (thing side), and the second lens 30 are between first lens 28 and the 3rd lens 32, and first lens 28 and the second lens 30 can be meniscus lens.
In order to take into account cost of manufacture and the structural design of projection lens 18, the present invention is limited to projection lens 18 and the focal length ratio of first lens group 24 within the scope of special value.For instance, the effective focal length of projection lens 18 is f, and the focal length of first lens group 24 is f g1, the numerical value of effective focal length f meets the restriction of 5.0mm≤f≤7.0mm conventionally, and effective focal length f and focal distance f g1ratio be preferably 0.75≤| f g1|/f≤1.28.
Refer to Fig. 3 to Fig. 7, Fig. 3 to Fig. 7 is the focal distance f of fixing effective focal distance f, the second lens combination 26 g2, the 3rd lens combination 38 focal distance f g3situation under, the first lens group 26 of projection lens 18 has different focal distance f g1configuration schematic diagram.Table 1 is enumerated several and is implemented aspect, and the effective focal length f of projection lens 18 is 6mm, the focal distance f of the second lens combination 26 and the 3rd lens combination 38 g2, f g3be respectively 23.027mm and 22.42mm, the focal distance f of first lens group 24 g1meet-8mm≤f of variation range g1the restriction of≤-4mm; According to effective focal length f and focal distance f g1different proportion, can analyze the total length and the rear burnt f that learn projection lens 18 bfl.
Table 1
Total length (mm) 130 115 94 94.06 96.517
f(mm) 6 6 6 6 6
f G1(mm) -4 -5 -6 -7 -8
f G2(mm) 23.027 23.027 23.027 23.027 23.027
f G3(mm) 22.42 22.42 22.42 22.42 22.42
f bfl(mm) 17.615 20 24 30.9 31.9
As shown in Figure 3, if ratio is less than lower limit (example: f g1=-4mm, during f=6, | f g1|/f=0.67,0.67 is less than lower limit 0.75), the total length of projection lens 18 is longer, and rear burnt f bflcorresponding too short, easy and projection arrangement 10 other elements interference, can cause the design and fabrication cost of projection lens 18 to improve.As shown in Figure 7, if ratio is greater than the upper limit (example: f g1=-8mm, during f=6, | f g1|/f=1.33,1.33 are greater than the upper limit 1.28), the total length of projection lens 18 is shorter, rear burnt f bflcorresponding long, need control aberration compared with multicomponent, not only can improve the design and fabrication cost of projection lens 18, and two lens combination 24,26 configured and are closely easy to focusing process and produce constructive interference and damage.As shown in Figures 4 to 6, ratio meet 0.75≤| f g1| the restriction of/f≤1.28, the total length of projection lens 18 and rear burnt f bflcan be controlled in proper range.Wherein, the rear burnt f of projection lens 18 bflscope be preferably 18mm≤f bfl≤ 32mm.
In addition, the present invention further designs the 3rd lens 32 and has larger refractive power (refractive power), for example: the focal length of first lens 28 is f l1, the focal length of the second lens 30 is f l2, the focal length of the 3rd lens 32 is f l3, and so, first lens 28 and the second lens 30 do not need to form higher surperficial curvature, and first lens 28 and the second lens 30 are easily produced, and then reduce the holistic cost of projection lens 18.Wherein, the better biconcave lens that can be of the 3rd lens 32.
The second lens combination 26 can comprise the 4th lens 34 and the 5th lens 36.The second lens combination 26 can comprise the 4th lens 34, the 5th lens 36, the 6th lens 40 and the 7th lens 42.The 4th lens 34 are preferably the non-spherical lens of glass material, to meet resistant to elevated temperatures actual demand.The 5th lens 36 are for being arranged on the balsaming lens between the 4th lens 34 and image-generating unit 16.The better cemented doublet (doublet lens) that can be of the 5th lens 36, as shown in Figure 2; Or also replaceable for having the single element lens of achromatism function, its application aspect is looked closely design requirement and determines, and in this, chats no longer in detail bright.Projection lens 18 also comprises the 3rd lens combination 38, the three lens combination 38 and is arranged between first lens group 24 and the second lens combination 26.The 3rd lens combination 38 is the focusing lens group of projection lens 18.The 3rd lens combination 38 comprises the 8th lens 44 and the 9th lens 46 conventionally, and so its eyeglass quantity can be not limited to shown in Fig. 2 embodiment.
In embodiments of the present invention, projection lens 18 has ten lens, wherein comprise two non-spherical lenses (first lens 28 and the 4th lens 34) and eight spherical lenses (the second lens 30, the 3rd lens 32, the 5th lens 36, the 6th lens 40, the 7th lens 42, the 8th lens 44 and the 9th lens 46, wherein the 5th lens 36 are the cemented doublet that two eyeglass gummeds form).Table 2 has been enumerated the better parameter value of each lens of projection lens 18.In table 2, the value of " distance " represents that the surface of corresponding these row is to the surperficial spacing of next column, the i.e. spacing of this row minute surface and next column minute surface.
Table 2
In other embodiments of the invention, projection lens 18 also can design by eight lens and form.Wherein the 3rd lens combination 38 can only comprise the 8th lens 44 (i.e. the 9th lens 46 omit need not), and the 5th lens 36 of the second lens combination 26 are separately replaced by a non-spherical lens (not being shown in figure).Therefore, the lens numbers of projection lens 18 of the present invention is no less than eight, and at the most can not more than ten because the inner space of projection lens 18 is limited two; In other words, the lens numbers of projection lens 18 is preferably more than or equal to 8 and be less than or equal to 12.
Refer to Fig. 8 to Figure 11.Fig. 8 is each lens aberration (ray aberration) simulation drawing of the projection lens 18 of the embodiment of the present invention.Fig. 9 is filed curvature (field curvature) and image deformation (distortion) simulation drawing of the projection lens 18 of the embodiment of the present invention.Figure 10 is lateral chromatic aberration (lateral color) simulation drawing of the projection lens 18 of the embodiment of the present invention.Figure 11 is modulation transfer function (modulation transfer function, the MTF) simulation drawing of the projection lens 18 of the embodiment of the present invention.In Fig. 8, figure (a) represents respectively the optical aberration analog image of first lens～nine lens of projection lens 18 to figure (i).From above-mentioned graphic analysis, projection lens 18 of the present invention has effectively been adjusted aberration, the out of focus of each camera lens, and obtain good control at aspects such as image deformation, filed curvature and lateral chromatic aberrations, according to modulation transfer function simulation drawing, can learn that projection lens 18 of the present invention has splendid performance in contrast contrast and sharpness.
Traditional short out-of-focus projection camera lens is easily having serious aberration near picture edge.The present invention designs the projection lens of a non-telecentric system, usings the first lens of non-spherical lens as projection lens.The present invention utilizes non-spherical lens to be modified to the optical aberrations such as image distortion, aberration, not only can effectively improve the image quality of projection arrangement, more can significantly reduce the lens numbers of projection lens, to meet price and the volume production advantage of product.
The present invention is described by above-mentioned related embodiment, yet above-described embodiment is only for implementing example of the present invention.Must be pointed out that, the embodiment having disclosed does not limit the scope of the invention.On the contrary, the change done without departing from the spirit and scope of the present invention and retouching, all belong to scope of patent protection of the present invention.

Claims (10)

1. a projection arrangement, is used for projecting image to screen, it is characterized in that, this projection arrangement includes:
Light source, provides light;
Image-generating unit, receives this light; And
Projection lens, is arranged between this image-generating unit and this screen, and in order to project this light to this screen, this projection lens comprises:
First lens group, contiguous this screen, this first lens group comprises and has negative dioptric first lens, the second lens and the 3rd lens, and this first lens is for being close to the non-spherical lens of this screen, and these second lens are between this first lens and the 3rd lens; And
The second lens combination, has positive diopter and contiguous this image-generating unit;
Wherein, the effective focal length of this projection lens is f, and the focal length of this first lens group is f g1, the focal length of this first lens is f l1, the focal length of these the second lens is f l2, the focal length of the 3rd lens is f l3, and 0.75≤| f g1|/f≤1.28, | 1 f L 1 + 1 f L 2 | > | 1 f L 3 | .
2. projection arrangement as claimed in claim 1, is characterized in that, the effective focal length f of this projection lens also meets the restriction of 5.0mm≤f≤7.0mm.
3. projection arrangement as claimed in claim 1, is characterized in that, the focal distance f of this first lens group g1also meet-8mm≤f g1the restriction of≤-4mm.
4. projection arrangement as claimed in claim 1, is characterized in that, rear Jiao of this projection lens is f bfl, and 18mm≤f bfl≤ 32mm.
5. projection arrangement as claimed in claim 1, is characterized in that, this projection lens is non-telecentric system.
6. projection arrangement as claimed in claim 1, is characterized in that, the 3rd lens are biconcave lens.
7. projection arrangement as claimed in claim 1, it is characterized in that, this second lens combination comprises the 4th lens and the 5th lens, the non-spherical lens that the 4th lens are glass material, and the 5th lens are the balsaming lens between the 4th lens and this image-generating unit.
8. projection arrangement as claimed in claim 7, is characterized in that, the 5th lens are cemented doublet or the single element lens with achromatism function.
9. projection arrangement as claimed in claim 1, is characterized in that, this projection lens also comprises the 3rd lens combination, and the 3rd lens combination is arranged between this first lens group and this second lens combination, the focusing lens group that the 3rd lens combination is this projection lens.
10. projection arrangement as claimed in claim 9, is characterized in that, the lens numbers of this projection lens is more than or equal to 8 and be less than or equal to 12.
CN201410198649.9A 2014-05-13 2014-05-13 Projection arrangement Active CN104076493B (en)

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CN201410198649.9A CN104076493B (en) 2014-05-13 2014-05-13 Projection arrangement
CN201610352738.3A CN105911678B (en) 2014-05-13 2014-05-13 Projection arrangement

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108267846A (en) * 2015-08-28 2018-07-10 苏州佳世达光电有限公司 Projection lens and projection arrangement
CN110361834A (en) * 2019-06-28 2019-10-22 福建福光股份有限公司 A kind of low distortion, the wide-angle lens of high relative illumination and its working method

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109212727B (en) * 2017-07-07 2021-04-06 中强光电股份有限公司 Projector and projection lens

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090015933A1 (en) * 1999-07-31 2009-01-15 Ho Young Choi Projection lens system
CN101354478A (en) * 2007-07-23 2009-01-28 扬明光学股份有限公司 Focus fixing lens
US20120314303A1 (en) * 2011-06-09 2012-12-13 Hon Hai Precision Industry Co., Ltd. Projection lens
CN103064175A (en) * 2011-10-24 2013-04-24 扬升照明股份有限公司 Projection lens
JP2013120393A (en) * 2011-12-07 2013-06-17 Kofukin Seimitsu Kogyo (Shenzhen) Yugenkoshi Projection lens

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20090015933A1 (en) * 1999-07-31 2009-01-15 Ho Young Choi Projection lens system
CN101354478A (en) * 2007-07-23 2009-01-28 扬明光学股份有限公司 Focus fixing lens
US20120314303A1 (en) * 2011-06-09 2012-12-13 Hon Hai Precision Industry Co., Ltd. Projection lens
CN103064175A (en) * 2011-10-24 2013-04-24 扬升照明股份有限公司 Projection lens
JP2013120393A (en) * 2011-12-07 2013-06-17 Kofukin Seimitsu Kogyo (Shenzhen) Yugenkoshi Projection lens

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108267846A (en) * 2015-08-28 2018-07-10 苏州佳世达光电有限公司 Projection lens and projection arrangement
CN110361834A (en) * 2019-06-28 2019-10-22 福建福光股份有限公司 A kind of low distortion, the wide-angle lens of high relative illumination and its working method
CN110361834B (en) * 2019-06-28 2021-08-10 福建福光股份有限公司 Wide-angle lens with low distortion and high relative illumination and working method thereof

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Publication number Publication date
CN104076493B (en) 2016-08-17
CN105911678B (en) 2019-03-19
CN105911678A (en) 2016-08-31

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