DE102012205472A1 - Semiconductor lamp e.g. incandescent LED-retrofit lamp, for decorative purposes, has light bulb designed as light conductor for emitted light, and lateral radiating reflector arranged in light bulb and provided with phosphor - Google Patents

Abstract

The lamp e.g. incandescent LED-retrofit lamp (11), has LEDs (12) over-curved by a solid material light bulb (19) i.e. candle-shaped light bulb, and emitting blue primary light (P), yellow secondary light (S1) and red secondary light (S2) outwards. The light bulb is designed as a light conductor for the emitted light. A lateral radiating reflector (23) is arranged in the light bulb and provided with phosphor (L1, L2). The reflector comprises a specular reflecting base surface on which the phosphor is applied. The reflector is provided in a region of a tip of the light bulb. The phosphor is a yellow phosphor and garnet phosphor.

Description

The invention relates to a semiconductor lamp, comprising at least one semiconductor light source, which is arched over by a light emitting to the outside flask. The invention is particularly applicable to retrofit lamps, in particular for decorative purposes.

At lamps equipped with light-emitting diodes as light sources to replace conventional incandescent lamps ("LED retrofit"), the most homogeneous possible light distribution in combination with an omnidirectional radiation pattern is often desired. The arrangement of the light emitting diodes (LEDs) or construction of the lamp while light losses are to be kept low. Use as a decorative bulb with transparent bulb in visible burners is greatly hampered by externally visible elements (LEDs, circuit board, phosphor regions and wiring), and the popular light bulb impression is lost.

Another aspect of the decorative lamp may be a concentrated light source in order to produce as brilliant as possible light reflections (so-called "sparkle"), eg when used in chandeliers. DE 10 2009 051 763 A1 discloses for this purpose a lighting device with at least one light source, at least one at least partially surrounding the at least one light source at least partially transparent piston and at least one base for mechanical support and electrical contacting of the lighting device. The piston has on at least one surface of the piston at least partially a plurality of planar portions. This is usually suppressed by diffused / matted pistons.

In particular, for decorative use retrofit lamps should also, as conventional incandescent lamps, have a compact design as possible.

At higher wattages (for example of P> 3 W), it is necessary to dissipate the waste heat generated by the light-emitting diodes by using heat sinks with the largest possible surface area. However, this can negatively affect the decorative effect, light homogeneity and omnidirectionality.

It is the object of the present invention to at least partially overcome the disadvantages of the prior art and in particular to provide a retrofit lamp of high brilliance with low losses, which has a reduced thermal load.

This object is achieved according to the features of the independent claims. Preferred embodiments are in particular the dependent claims.

The object is achieved by a semiconductor lamp, comprising at least one of a light radiating outwardly radiating flask vaulted semiconductor light source, wherein the piston is configured as a light guide for radiant from the at least one semiconductor light source light and wherein at least one phosphor provided with reflector is arranged ,

By the function of the piston as a light guide, a flexible and large-area light emission can be achieved out of the piston, in particular with a high omnidirectionality, which allows a good approximation to a Lichtabstrahlcharakteristik a conventional light bulb. In addition, only a small-area light coupling surface needs to be provided to the at least one semiconductor light source, giving an impression of a concentrated light source and thus e.g. brilliant light reflections possible. Also, light losses in the formed as an optical fiber pistons are low. Moreover, due to its design as a light pipe, the piston is typically thicker than a conventional, thin-shelled piston, so that it has a better thermal connection (in particular to a housing cooling body holding the piston) and better suitability as a heat dissipation element and a heat sink , which allows use of stronger semiconductor light sources.

The piston can in particular be designed as a TIR body, which uses a total internal reflection for the light conduction of light running in it. The piston may in particular consist of a material which has a higher refractive index (n> 1) than air.

In general, the piston material is not limited and can be used at least as a base material e.g. Plastic, glass or glass ceramic exhibit. The base material may comprise one or more fillers. The piston material is in particular a pourable material.

It is also a development that the piston is a solid body in the sense of a solid. This facilitates production.

It is an alternative development that the piston is filled with a light-conducting liquid, which can act as a light guide. In particular, the piston can have an open or closed cavity which is filled with the liquid. If the cavity is open, For example, it can be closed on one side with the housing heat sink. The provision of liquid can improve thermal coupling and / or heat dissipation. It is advantageous for an effective exchange of light between the liquid and the piston that the liquid and the piston have at least approximately the same refractive index.

It is a further development that the piston is a transparent piston, that is, that a piston material of the piston is a transparent piston material. This allows, for example, brilliant light reflections.

It is also a development that the piston material is a diffusely scattering material, which allows a particularly large-scale and homogeneous coupling. The piston material may be, for example, the type Plexiglas EndLighten Evonik. There is still a possibility that the piston partially or partially contains diffuse scattering material to ensure targeted light extraction at certain points of the piston or z. B. to produce special visual effects.

For example, to achieve a particularly homogeneous impression in the operation of the semiconductor lamp, a combination of the above-described possibilities for light extraction can be used. Thus, e.g. a (fluorescent) reflector and additionally a scattering piston material are used for smoothing a radiation characteristic.

Since, due to the optical fiber effect of the bulb, a certain part of the light emitted by the at least one (phosphor) reflector is guided back towards the at least one semiconductor source, it is advantageous for a high light output to make a region around the at least one semiconductor source reflective, eg with a white or specular reflecting surface.

It is also a development that the at least one semiconductor source is arranged or mounted planar. This facilitates their assembly.

In particular, the piston can have at least one light coupling surface facing the at least one semiconductor light source for coupling light generated by the at least one semiconductor light source. Thus, light emitted by the at least one semiconductor light source can be selectively coupled into the bulb. The at least one light coupling surface can in particular be formed by at least a part of a lower side of the piston.

It is a development that the piston is spaced from the at least one semiconductor light source.

The light input surface may be planar or curved (e.g., domed). The light coupling surface may be smooth or rough (diffused).

The fact that the piston overarching the at least one semiconductor light source may mean, in particular, that the piston at least partially surrounds the at least one semiconductor light source. It may also mean, in particular, that the bulb of the at least one semiconductor light source is optically connected downstream and thus at least a part of the light emitted by the at least one semiconductor light source is coupled into the bulb. In particular, the bulb may "tightly" surround the at least one semiconductor light source, that is, substantially all of the light radiated outwardly from the semiconductor lamp has previously passed through the bulb and consequently no light passes outwardly past the bulb. In particular, at least substantially all of the light emitted by the at least one semiconductor light source may be coupled into the bulb.

By means of the reflector, light in the bulb can be directed out of the bulb, e.g. by falling below an angle of total reflection. This allows a targeted and / or locally differentiated light emission. In addition, the light can emerge concentrated at the reflector and thus give the impression of a concentrated light source, whereby the perceived as attractive "sparkle" effect, z. B. for use in chandeliers o. Ä., Created.

The semiconductor lamp can be designed, in particular, as a retrofit lamp, which at least in its appearance, in particular its outer contour, and its light emission of a conventional lamp is at least similar. In particular, the retrofit lamp may be designed as an incandescent retrofit lamp, in particular for replacing a candle-shaped incandescent lamp, e.g. of the type 'Classic B'.

The lamp, in particular the retrofit lamp, has in particular a rear socket for the mechanical and electrical connection with a suitable socket, for example a lamp or a lighting system. To the base can connect to the front of a (housing) heat sink, which has, for example, a driver cavity for receiving a driver. The driver may convert the electrical signals received from the socket into electrical signals for operation of the at least one semiconductor lamp. At a front side of the heat sink, for example, the at least a semiconductor light source may be arranged and be vaulted or surrounded by the serving as a light guide piston, in particular spaced. The piston can in particular be placed on or attached to the heat sink. In particular, the piston can form a front region of the lamp.

Preferably, the at least one semiconductor light source comprises at least one light-emitting diode. If several LEDs are present, they can be lit in the same color or in different colors. A color may be monochrome (e.g., red, green, blue, etc.) or multichrome (e.g., white). Several light emitting diodes can produce a mixed light, e.g. a white mixed light (color temperature CCT eg 5000 K to 6000 K) or a warm white mixed light (CCT eg between 2700 K and 3000 K). The at least one light-emitting diode may contain at least one wavelength-converting phosphor (conversion LED). The at least one light-emitting diode can be in the form of at least one individually housed light-emitting diode or in the form of at least one LED chip. Several LED chips can be mounted on a common substrate ("submount"). The at least one light emitting diode may be equipped with at least one own and / or common optics for beam guidance, e.g. at least one Fresnel lens, collimator, and so on. Instead of or in addition to inorganic light emitting diodes, e.g. based on InGaN or AlInGaP, organic LEDs (OLEDs, for example polymer OLEDs) can generally also be used. Alternatively, the at least one semiconductor light source may be e.g. have at least one diode laser.

It is particularly advantageous for multiform wavelength / color conversion if the at least one semiconductor light source has or is at least one blue light emitting semiconductor light source, in particular at least one 'blue' LED chip, in particular thin-film LED chip (eg thin GaN). or LED surface spotlight.

Because the at least one reflector is covered with (at least one) phosphor, a higher light yield can be achieved by the spatial separation ("remote phosphor") of the phosphor from the at least one semiconductor light source, since only a small portion of that produced in the phosphor Photons from the semiconductor light source is absorbed directly. In addition, this results in a reduction of a junction temperature of the at least one semiconductor light source, which reduces a thermal load of the semiconductor light source and, for example, allows a reduction of the heat sink.

That at least one reflector is a "phosphor-coated reflector" may in particular include that the phosphor serves as a (diffusely) reflecting substance or diffuser / reflector material. Light incident on the phosphor is typically at least partially wavelength-converted and then emitted in particular isotropically or diffusely. In a partial conversion in which a portion of an incident light is not converted, typically also the unconverted light is diffused. The reflector is thus in particular a diffuse reflector. The reflector may also be referred to as a scattering element or scattering body.

The phosphor may in particular be layered. For example, the phosphor may be present as a filler of a translucent matrix material (e.g., silicone). Alternatively, the phosphor may be present as a ceramic phosphor body, e.g. as a ceramic tile.

In general, several reflectors / scatterers may be present.

It is an embodiment that the piston is a solid material piston. The solid material piston may in particular be a compact, i. not hollow, be a piston. A solid material piston enables a particularly low-loss light guide and a particularly effective thermal connection and dissipation. In addition, a solid material piston is particularly easy to produce.

It is yet another refinement that the at least one semiconductor light source is a semiconductor light source ('converting semiconductor light source') partially converted with at least one phosphor. This allows greater selection and utilization of the light directed onto the reflector, e.g. in terms of color (s).

The at least one phosphor of the semiconductor light source and the at least one phosphor of the reflector may in particular be different. Consequently, mixed light with secondary light components of different spectral ranges can be generated by the semiconductor lamp, which increases an adjustable gamut, e.g. comprising white light with a color temperature CCT between 5000 K and 6000 K or warm white light with a color temperature CCT between 2700 K and 3000 K. In this case, an undesired interaction of the at least one phosphor arranged on the semiconductor light source and the reflector arranged on the at least one phosphor is suppressed , Also, such a thermal load of the semiconductor light source is reduced. In particular, it is possible to leave a more expensive phosphor on the semiconductor light source, whereby significantly less material is needed. Nevertheless one uses the advantage of the separation of the other phosphors.

As a result of the semiconductor light source, which is partially converted by at least one phosphor, it is radiated by both (primary) light emitted by an LED chip and not converted by the at least one phosphor (in particular blue light), and by the at least one phosphor placed thereon (at least one first secondary) light. The semi-converting with the at least one phosphor occupied semiconductor light source thus emits a mixed light with a primary light component and at least one secondary light component.

In principle, at least one semiconductor light source can also be fully converted with phosphor. The phosphor used for the full conversion is preferably in the form of a ceramic conversion element, e.g. a ceramic plate.

It is a development of this that at least one phosphor arranged on the reflector does not react to (first) secondary light which is generated by at least one luminescent substance (with which the semiconductor light source is assigned) arranged on the semiconductor light source. As a result, the light components of the semiconductor lamp can be set in a particularly simple and precise manner. However, at least one phosphor arranged on the reflector may react to primary light emitted by the semiconductor light source and at least partially convert it.

It is still a further development that at least one phosphor arranged on the reflector reacts to (first) secondary light, which is generated by at least one phosphor arranged on the semiconductor light source. In other words, therefore, at least one phosphor arranged on the reflector converts light generated by a phosphor arranged on the semiconductor light source.

It is a particularly preferred development that the semiconductor lamp is adapted to emit white (mixed) light having a low color temperature (for example, between 2500 K and 4000 K, so-called "warm white" light).

In particular, such a warm white light can be achieved by a mixture of blue light, yellow light and red light. This is particularly preferably implementable by (i) a use of a semiconductor light source emitting blue (primary) light, (ii) a yellow light emitting 'yellow' phosphor and (iii) a red light emitting 'red' phosphor. The phosphors can be excited in particular by the blue primary light. Alternatively, for example, the red phosphor may be such that, besides the blue primary light, it can also absorb and convert the yellow (secondary) light of the yellow phosphor. The yellow phosphor emitting in the yellow spectral range can be, for example, a garnet phosphor of the type (Y, Lu, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce ³⁺ , the red phosphor emitting in the red spectral range an Eu-doped nitride of the (Ca, Sr, Ba) AlSiN ₃ : Eu ²⁺ or (Ca, Sr, Ba) 2Si ₅ N ₈ : Eu ²⁺ .

For example, a phosphor layer consisting of one of the two phosphors (in particular the red phosphor) can be applied directly to a blue emitting LED chip, e.g. glued as a ceramic phosphor plate. A resulting first, partial light conversion produces a spectrum with peaks in the blue and red spectral range. This emitted light is guided in the flask to the reflector, where the yellow phosphor is attached, which contributes to the production of the warm white mixed light still lack of color by blue-yellow partial conversion. For red light, the yellow phosphor serves as a non-converting diffuser material. The reflector laterally distributes the generated light homogeneously over the solid angle.

The semiconductor lamp is not limited to this case. For example, it is possible to reverse the order of the phosphors.

It is also an embodiment that the reflector is a substantially laterally radiating reflector. This is particularly desirable in candle-shaped retrofit lamps.

It is a further development that the reflector is a reflector which projects forward from the heat sink via the at least one semiconductor light source and which, in particular, vaulted over the at least one semiconductor light source and thus projects laterally beyond it.

The reflector can in particular expand forward. For this purpose, the reflector may in particular have a conical or cone-like basic shape, for example with a straight-line or curved lateral surface in longitudinal section, in particular with a forwardly reinforcing curvature away from a longitudinal axis of the semiconductor lamp. A tip is preferably aligned in the direction of the at least one semiconductor light source. In particular, such a reflector can distribute light homogeneously over a large solid angle.

It is yet a further embodiment that the reflector has a specularly reflecting base surface (of a main body), on which the at least one phosphor is applied. Thus, absorption losses can be kept low, especially if the at least one phosphor of the reflector is formed only partly converting its thickness and therefore can not meet even wavelength-converted light on the base. An adjustment of a color locus may, for example, take place via an (optical) thickness of the phosphor, in particular via an (optical) thickness of a phosphor layer having the at least one phosphor. The thinner the layer, the higher the remaining portion of the unconverted light. Alternatively or additionally, a degree of conversion may be set via a density of the at least one phosphor.

It is also a favorable for keeping absorption losses that the at least one phosphor, in particular phosphor layer, of the reflector is formed vollkonvertierend across its thickness. As a result, only a small part of the primary light and / or the converted secondary light reaches the base area. In particular, the (optical) thickness of the at least one phosphor, in particular phosphor layer, can have a thickness such that practically no more light strikes the base surface. This embodiment also has the advantage that a reflectivity of the base of the reflector is practically negligible.

It is a preferred embodiment for the simple adjustment of a color locus that the at least one phosphor is present as filler material in a light-permeable matrix material and the matrix material has non-absorbing, non-absorbent scattering particles as further filler material. The scattering particles may be present, for example, as particles of Al 2 O 3 and / or TiO 2, e.g. With an average diameter of about 500 nm. Thus, an average penetration depth of the incident light in the phosphor and thus consequently adjust the color of the light emitted by the semiconductor lamp light.

The phosphor can in particular be applied to a good thermally conductive body of the reflector, in particular as a layer. The main body may for example consist of aluminum.

It is also an embodiment that at least one reflector / scattering element is located in a region of a tip of the piston. This allows a light emission to the outside over the largest length of the piston, which allows a high approximation to a light emission characteristic of a conventional lamp and also a particularly flexible design of the light emission.

In particular, a region of a tip of the piston can be understood to mean a region within a front third of the piston, in particular within a front quarter of the piston, in particular within the front 10% of the length of the piston. However, the at least one light deflection element can in principle also be arranged further back. The reflector may also form an upper end of the piston.

It is an embodiment which is advantageous for providing the light effect known as "sparkling" or "sparkle" in that the reflector extends as far as a side edge of the piston, in particular extends circumferentially. As a result, a particularly effective irradiation of the reflector with guided in the piston, outgoing from the semiconductor light sources light is made possible. In particular, the reflector may form an upper end of the piston. The piston may also extend above the reflector, e.g. to provide enhanced external similarity to a conventional lamp to be replaced, e.g. an incandescent lamp, e.g. of the Classic B type. The reflector can then divide the piston into a (lower) part used for the light pipe and an upper part used for shape similarity.

It is a favorable alternative embodiment for providing a light effect known as "sparkle" that the reflector is completely surrounded by the piston at least on the outside. As a result, a part of the light guided in the bulb, which is generally smaller, can be guided outside the reflector past into a tip of the semiconductor lamp and exit there in a concentrated manner.

It is yet another embodiment which is advantageous for providing a "sparkle effect" that the piston has locally limited, in particular punctiform, impurities on its surface. As a result, the "sparkle" -producing point-shaped light extraction (due to a violation of the condition for total reflection) from the piston predominantly of the light generated by the at least one semiconductor light source (and possibly occupied thereby phosphor) allows. The impurities are preferably distributed over the outer surface of the piston. The impurities may be e.g. as perforations or punctured ruffles.

It is a preferred development for suppressing a color effect of the at least one phosphor arranged on the reflector that scattering particles are provided in the region of the phosphor and / or that the bulb is coated with an optically active layer which reversibly changes a transmittance in the visible region in a temperature-dependent manner. Another possibility is the occupation, in particular coating, of the at least one phosphor of the reflector a dielectric interference filter or with a single-side transmissive mirror.

It is still a development that at least one macro-optical view element is introduced into the piston. A macrooptical view element may, in particular, be understood to mean an element whose shape and optionally color is perceptible. In particular, a macro-optic view element may be a design element, e.g. a specular or diffuse reflecting reflector or scattering body. This embodiment allows the advantage that the piston can be designed with decorative elements and thus a variety of design can be increased.

It is further a development that the at least one macro-optical view element comprises a filament or a filament mimicking element. As a result, in particular a similarity to a conventional incandescent lamp ("light bulb impression") can be increased.

The at least one macro-optical view element can be cast in the piston, for example. The piston can thus consist in particular of such a configuration of a potting material.

It is also an embodiment that in the piston an inner engraving is present. The internal engraving can be used in particular targeted pollution sites are introduced into the piston material. By the internal engraving, a variety of design can be increased, and without physical elements would have to be provided and integrated into the piston. In particular, for an internal engraving, the piston material may be acrylic glass.

It is a development that the inner engraving is a three-dimensional engraving, in particular laser engraving. This allows a design of three-dimensional images.

It is still a development that the inner engraving is a filament or a filament mimicking element. This also makes it possible in particular to increase a similarity to a conventional incandescent lamp.

It is a further embodiment that the piston is a candle-shaped piston. Such candle-shaped pistons are preferably used for decorative purposes, e.g. for candlesticks, and thus can particularly benefit from the invention.

The above-described characteristics, features, and advantages of this invention, as well as the manner in which they will be achieved, will become clearer and more clearly understood in connection with the following schematic description of exemplary embodiments which will be described in detail in conjunction with the drawings. In this case, the same or equivalent elements may be provided with the same reference numerals for clarity.

1 shows a sectional side view of a semiconductor lamp according to a first and a second embodiment;

2 shows a sectional side view of a semiconductor lamp according to a third embodiment; and

3 shows a sectional side view of a semiconductor lamp according to a fourth embodiment.

1 shows a semiconductor lamp in the form of a filament LED retrofit lamp 11 as a replacement for a conventional candle-shaped light bulb. The LED retrofit lamp 11 has a plurality of semiconductor light sources in the form of LED chips designed as LEDs 12 which emit blue primary light P. The light-emitting diodes 12 are planar on a substrate 13 (For example, a ceramic substrate or a printed circuit board) applied and parallel to a longitudinal axis A of the LED retrofit lamp 11 aligned. The light-emitting diodes 12 Thus, their light emits light in a half-space centered in the direction of the longitudinal axis A, ie vertically upwards. In particular, its optical axis may be aligned parallel to the longitudinal axis A.

The substrate 13 lies on a front bearing surface 14 a heat sink 15 which has a driver cavity 16 for receiving a driver (o.Fig.) Has. Backward connects to the heat sink 15 an Edison socket 17 for mechanical and electrical connection to a suitable socket, eg a luminaire. From the light-emitting diodes 12 generated waste heat can at least partially through the substrate 13 on the heat sink 15 be transferred and removed from this.

On a front edge 18 of the heat sink 15 sits a transparent piston 19 with its back edge 20 flat on. The piston 19 vaulted the LEDs 12 and covers at least their upper-side emitter surfaces on the upper side and laterally (laterally) spaced from. The piston 19 has at its the light emitting diodes 12 facing back or bottom 21 one as a light coupling surface 22 serving dome-like or dome-shaped return, in which the light-emitting diodes 12 plunge. As a result, substantially the entire of the light-emitting diodes falls 12 emitted light on the light coupling surface 22 and will be there in the pistons 19 coupled. A possibly occurring small proportion of at the Lichteinkopplungsfläche 22 Reflected light, for example, by a reflective design of the heat sink 15 and / or the substrate 13 be at least partially reflected back, which increases a luminous efficacy. This can be an area next to the light emitting diodes 12 Eg be covered with a highly reflective material (eg distributed in silicone TiO2).

Because the LED retrofit lamp 11 serves as a replacement for a conventional, candle-shaped bulb and the piston 19 correspondingly has a candle-like (not pear-shaped) shape, the heat sink 15 and the pedestal 17 comparatively narrow and is the Lichteinkopplungsfläche 22 concentrated accordingly, but this may be desirable for decorative purposes, especially a high brilliance.

The piston 19 is present as a solid solid and is as a light guide for that of the light emitting diodes 12 radiatable light designed. A light conductivity of the piston 19 can be achieved in particular by a configuration as a total internal reflection (TIR) enabling TIR body, ie, that light in the piston 19 due to a total internal reflection. The embodiment of the piston 19 as a solid body (and not just as a thin shell) has the further advantage that it is suitable for effective heat dissipation and thus can serve as an (additional) heat sink. In particular, due to the comparatively large contact area 18 . 20 with the heat sink 15 can be a large amount of heat from the heat sink 15 be taken and delivered to the outside. This is particularly advantageous in a candle-shaped LED retrofit lamp 11 which has a comparatively small heat sink 15 having.

For defined decoupling of the in the piston 19 running light is in the pistons 19 a light deflecting element in the form of a reflector 23 integrated, eg shed in it. On the reflector 23 thus the light hits a side edge or an outer surface 25 of the piston 19 deflected that there the limit angle of the total internal reflection is exceeded and light from the piston 19 can emerge out.

The reflector 23 is designed as a specular or diffuse reflecting reflector (thus also serves as a scattering body or scattering element), which, for example, a particularly high homogeneity of the Lichtabstrahlmusters can be achieved. The reflector 23 has a trumpet-shaped base body 26 made of aluminum, which is arranged symmetrically to the longitudinal axis A and in the direction of the LEDs 12 converges. The main body 26 Thus, has a longitudinally curved surface 27 on, with increasing distance from the light emitting diodes 12 expands. The reflector 23 extends laterally to a side edge of the piston 19 ,

The main body 26 of the reflector 23 is at least on the lateral surface 27 covered with a layer of phosphor L1, which may have, for example embedded in silicon as a matrix material particles of the phosphor L1. In particular, the phosphor L1 may be a yellow phosphor, for example a garnet phosphor of the type (Y, Lu, Gd) ₃ (Al, Ga) ₅ O ₁₂ : Ce ³⁺ .

When operating the LED incandescent retrofit lamp 11 the LEDs shine 12 blue primary light P from that at the light coupling surface 22 in the pistons 19 is coupled and from the piston 19 to the reflector 23 , or to the phosphor L1, is passed. There, the primary light P is partially converted into yellow first yellow (secondary) light S1, and both the unconverted primary light P and the first secondary light S1 are diffused. This results in a total of a blue-yellow or white mixed light P, S1 from the LED incandescent retrofit lamp 11 radiated.

The reflector 23 is designed so that it is a substantially laterally (in particular in a rear half space) radiating reflector, which may be advantageous for example for upright lamps, eg in chandeliers. The reflector may alternatively be a large-angle, in particular in a rear half-space, radiating reflector, which improves omnidirectionality.

The reflector 23 is also located in a front tip portion of the piston 19 , ie here in a front quarter of a length of the piston 19 , This allows much of the outside surface 25 of the piston 19 be used for light emission.

The piston 19 indicates on its outer surface 25 In addition, locally limited, in particular punctiform, impurities 29 through which predominantly blue primary light P can emerge to produce a "sparkle" effect.

In a second embodiment, the reflector 23 at least on the lateral surface 27 additionally covered with a red phosphor L2, eg with Eu-doped nitride ceramics of the type (Ca, Sr, Ba) AlSiN ₃ : Eu ²⁺ or (Ca, Sr, Ba) ₂ Si ₅ N ₈ : Eu ²⁺ . This can also be incorporated as filler in the silicone matrix. The red phosphor L2 also reacts sensitively to the blue primary light P, which it at least partially converts to the second, red secondary light S2. This results in a total of a blue-yellow-red or warm-white mixed light P, S1, S2 from the LED incandescent retrofit lamp 11 radiated.

2 shows a sectional view of an LED retrofit lamp 31 according to a third embodiment. The LED retrofit lamp 31 is similar to the LED retrofit lamp 11 constructed according to the second embodiment, except that now a second, red phosphor L2 serving as light emitting diode as such blue LED chips 12 partly converting covered and the converting light emitting diodes 32 respectively. 12 , L2 therefore emit blue primary light P and red secondary light S2. The second, red phosphor L2 may in particular be present as a ceramic plate.

The reflector 23 is only equipped with the first, yellow phosphor L1, which is sensitive only to the primary light P, but not sensitive to the second, red secondary light S2 and the second secondary light S2 only scatters. Consequently, here as well, a bluish-yellow-red or warm-white mixed light P, S1, S2 from the LED incandescent retrofit lamp is obtained 11 emitted, but the amount of the red phosphor L2 is less than in the second embodiment.

3 shows a sectional view of an LED retrofit lamp 41 according to a fourth embodiment. The LED retrofit lamp 41 is similar to the LED retrofit lamp 11 constructed according to the second embodiment, except that now the reflector 42 not up to the outer surface 25 of the piston 43 extends but completely from the piston 43 is surrounded. This will edge of the reflector 42 an annular region of the piston 43 through which in the piston 43 guided light, in particular blue primary light P, at the reflector 42 over in one above the reflector 42 located peak area 44 can reach and can be illuminated from there concentrated. Even so, a "sparkle" effect is created. The top section 44 can, especially in contrast to the rest of the piston 43 for more homogeneous light emission from the tip area 44 , be filled with non-absorbent litter material M.

Although the invention has been further illustrated and described in detail by the illustrated embodiments, the invention is not so limited and other variations can be derived therefrom by those skilled in the art without departing from the scope of the invention.

Thus, features of the embodiments can also be mixed or replaced, for example, the LED retrofit lamp 41 According to the fourth embodiment be equipped with two (or more) phosphors.

LIST OF REFERENCE NUMBERS

11

LED retrofit

12

led

13

substratum

14

bearing surface

15

heatsink

16

Treiberkavität

17

Edison socket

18

front edge

19

piston

20

backward edge

21

bottom

22

Lichteinkopplungsfläche

23

reflector

25

outer surface

26

body

27

lateral surface

29

impurity

31

LED retrofit

32

led

41

LED retrofit

42

reflector

43

piston

44

tip area

A

longitudinal axis

L1

yellow phosphor

L2

red phosphor

M

Streumaterial

P

blue primary light

S1

yellow secondary light

S2

red secondary light

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102009051763 A1 [0003]

Claims (13)

Semiconductor lamp ( 11 ; 31 ; 41 ), in particular retrofit lamp, comprising at least one piston (B, S2, S2) radiating outwards ( 19 ; 43 ) vaulted semiconductor light source ( 12 ; 32 ), wherein - the piston ( 19 ; 43 ) as a light guide for the at least one semiconductor light source ( 12 ; 32 ) Abstrahlbares light (P; P, S2) is configured and - in the piston ( 19 ; 43 ) at least one reflector provided with at least one phosphor (L1, L2; L1) ( 23 ; 42 ) is arranged. Semiconductor lamp ( 11 ; 31 ; 41 ) according to claim 1, wherein the piston ( 19 ; 43 ) is a solid material piston. Semiconductor lamp ( 31 ) according to one of the preceding claims, wherein at least one semiconductor light source ( 32 ) a semi-converting with at least one phosphor (L2) occupied semiconductor light source ( 12 ), wherein this at least one phosphor (L2) and the at least one phosphor (L1) of the reflector ( 23 ) are different. Semiconductor lamp ( 11 ; 31 ; 41 ) according to claim 3, wherein the reflector ( 23 ; 42 ) a substantially laterally radiating reflector ( 23 ; 42 ). Semiconductor lamp ( 11 ; 31 ; 41 ) according to one of the preceding claims, wherein the reflector ( 23 ; 42 ) has a specularly reflective base on which the at least one phosphor (L1, L2) is applied. Semiconductor lamp ( 11 ; 31 ; 41 ) according to one of the preceding claims, wherein the at least one phosphor (L1, L2) is present as filling material in a light-permeable matrix material and the matrix material has non-converting scattering particles as further filling material. Semiconductor lamp ( 11 ; 31 ; 41 ) according to one of the preceding claims, wherein the reflector ( 23 ; 42 ) in a region of a tip of the piston ( 19 ; 43 ) is located. Semiconductor lamp ( 11 ; 31 ) according to claim 7, wherein the reflector ( 23 ) to a page margin ( 25 ) of the piston ( 19 ), in particular extends circumferentially. Semiconductor lamp ( 41 ) according to claim 7, wherein the reflector ( 42 ) completely from the piston ( 43 ) is surrounded. Semiconductor lamp ( 41 ) according to any one of the preceding claims, wherein the piston ( 43 ) in a lace area ( 44 ) above the reflector ( 42 ) is filled with scattering particles (M). Semiconductor lamp ( 11 ) according to any one of the preceding claims, wherein the piston ( 19 ; 43 ) on its outer surface ( 25 ) locally limited, in particular punctiform, impurities ( 29 ) having. 12 , Semiconductor lamp ( 11 ; 31 ; 41 ) according to any one of the preceding claims, wherein the piston ( 19 ; 43 ) of the at least one semiconductor light source ( 12 ; 32 ) is spaced and the piston ( 19 ; 43 ) at least one of the at least one semiconductor light source ( 12 ) facing Lichteinkoppelungsfläche ( 22 ) having. Semiconductor lamp ( 11 ; 31 ; 41 ) according to any one of the preceding claims, wherein the piston ( 19 ; 43 ) is a candle-shaped piston.

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