JP2011187896A - Light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a light emitting device that has small coloration of the surface thereof caused by a member for converting a light emission color of a light source. <P>SOLUTION: The light emitting device 10 includes an LED package 20 as a light source, an LED substrate 30 on which the LED package 20 is mounted, and a reflector 40 which controls a projection direction of light of the LED package 20. Then the light emitting device 10 is provided with the color conversion member 60, which converts the color (color temperature) of the light from the LED package 20, in an opening region 43 of the reflector 40 substantially at right angles to an opening surface 42 of the reflector 40. Specifically, the color conversion member 60 is provided removably in the opening region 43 by slits 41 provided in the reflector 40 so as to be substantially perpendicular to the opening surface 42 of the reflector 40. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a light emitting device. In particular, the present invention relates to a light-emitting device applicable to a lighting fixture or a display fixture using a light-emitting diode (LED; Light Emitting Diode).

  As a light emitting device using LEDs with variable color temperature, for example, a light emitting device surface on which a plurality of LED light emitting units having a first phosphor region are arranged in a planar shape is matched with the light emission characteristics of each light emitting unit. The structure which provides 2 fluorescent substance area is disclosed (for example, refer patent document 1).

JP 2007-273877 A

  In the configuration of Patent Document 1, since a plurality of second phosphor regions are exposed on the front surface, it is necessary to allow joints used as boundaries between them, and further, a reflector provided around the first phosphor region Since the second phosphor region is arranged so as to cover the light source, there is no mechanism for controlling the light distribution of the light emitting device, and when it is desired to change the device light distribution, a large-sized distribution is provided so as to cover the entire second phosphor region. There is a problem that it is necessary to provide a light control member, and the apparatus becomes large. In general, the phosphor material application region is colored by some color (the body color of the material) when the phosphor is excited by natural light. However, in the configuration of Patent Document 1, the first phosphor region is very small. Since the entire second phosphor region tends to be colored instead of the region, the appearance of the apparatus has a problem that the entire surface region appears colored even when the light is extinguished.

  An object of this invention is to provide the light-emitting device with few surface coloring by the member which converts the luminescent color of a light source, for example.

A light emitting device according to one embodiment of the present invention includes:
A light source that emits light;
A reflector that has an aperture surface, reflects light emitted from the light source, and emits the light from the aperture surface;
A sheet-like color conversion member for converting the color of light emitted from the light source, the sheet surface being substantially perpendicular to the opening surface of the reflector on a side closer to the light source than the opening surface of the reflector. And a color conversion member installed in the device.

  According to one aspect of the present invention, since the color conversion member of the light-emitting device is installed so that the sheet surface is substantially perpendicular to the opening surface of the reflector, the light-emitting device with less coloration of the surface by the color conversion member Can be provided.

(A) It is a disassembled perspective view of the light-emitting device concerning Embodiment 1, (b) It is AA sectional drawing of (a). 2A is a top view of the LED package according to Embodiment 1, and FIG. 2B is a cross-sectional view taken along line BB in FIG. (A) It is a perspective view of the light-emitting device concerning Embodiment 2, (b) It is an enlarged view of a hook part vicinity.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1A is an exploded perspective view of the light emitting device 10 according to the present embodiment, and FIG. 1B is a cross-sectional view taken along line AA of FIG. 2A is a top view of the LED package 20 according to the present embodiment, and FIG. 2B is a cross-sectional view taken along the line BB in FIG.

  1A and 1B, the light emitting device 10 includes twelve LED packages 20 as light sources that emit light. 2A and 2B, an LED package 20 includes an LED chip 21 and an LED package substrate 22 such as a resin or ceramic that mounts the LED chip 21 or a metal base, and an epoxy or silicone mixed with a phosphor. The LED sealing resin 23 is used. In the figure, a die bond material, a Y bond material, and the like are omitted for simplification. The LED chip 21 emits substantially blue-violet, substantially blue, or substantially blue-green light of about 380 to 480 nm (nanometers). The light from the LED package 20 is emitted from the region of the LED sealing resin 23 (circular region in FIG. 2A), and the one-dot chain line in FIG. 2B becomes the optical axis Y of the LED package 20. .

  When a blue LED is used as the LED chip 21, the phosphor contained in the LED sealing resin 23 includes a yellow component (light component having a peak wavelength of 530 to 590 nm) excited by the emission wavelength of the LED chip 21. Those having an emission spectrum are used. The emission color of the blue LED chip 21 and the excitation emission color of the phosphor are approximately complementary colors, and in this case, white light is generated as the light of the LED package 20.

  The LED package 20 is mounted on an LED substrate 30 on which a conductive pattern that enables power supply from the outside is formed. For example, an inexpensive glass epoxy substrate is used as the LED substrate 30. Alternatively, a metal substrate such as aluminum having a surface insulation or a ceramic substrate is used for the high power LED package 20.

  The light emitting device 10 further includes a reflector 40 having high reflectivity and having a light distribution control function, and a sheet-like color conversion member 60 that converts the color of light emitted from the LED package 20. The reflector 40 is provided so as to surround the periphery of each LED package 20. Each reflector 40 has an opening surface 42, reflects the light emitted from the corresponding LED package 20, and emits the light from the opening surface 42. Each reflector 40 has a slit 41 for holding the color conversion member 60. The color conversion member 60 is detachably provided in the opening region 43 so as to be substantially perpendicular to the opening surface 42 of the reflector 40 by a slit 41 provided in the reflector 40. That is, the color conversion member 60 is located closer to the slit 41 of the reflector 40 such that the sheet surface is substantially perpendicular to the opening surface 42 of the reflector 40 on the side closer to the LED package 20 than the opening surface 42 of the reflector 40. Installed freely. For this reason, when the light-emitting device 10 is viewed from the irradiation surface side when the color conversion member 60 is attached, the light-emitting device 10 that has excellent design properties and is less likely to be colored by the color conversion member 60 even when turned off. be able to. In addition, the light distribution by the reflector 40 can be generally maintained, and the irradiation area can be efficiently irradiated with light.

  The color conversion member 60 is excited by light emitted from the LED package 20 and emits light of a predetermined color (that is, excited by light emitted from the LED package 20 to emit different light) and a light diffusion filler. A plate-like member kneaded in a resin material such as silicone as a base material. The thickness of the color conversion member 60 is practically 100 μm (micrometer) to 3 mm (millimeter).

  1A and 1B, the light emitting device 10 includes three color conversion members 60. The reflector 40 has a slit 41 corresponding to each color conversion member 60. Specifically, the reflector 40 has slits 41 (three slits 41 when one row is one) parallel to three rows in the longitudinal direction of the light emitting device 10. The color conversion member 60 can be inserted into and removed from each of the slits 41 of the reflector 40. For this reason, the color conversion member 60 can be attached and detached easily.

  On the surface of the light emitting device 10, a translucent surface cover 50 is detachably installed so as to cover the opening surface 42 of the reflector 40. The front cover 50 is a flat plate made of resin or glass, or a plate material having fine unevenness for light distribution control on the front or back surface.

  With the above configuration, in the present embodiment, the reflector 40 disposed at a position corresponding to the LED package 20 reflects the light from the LED package 20 in a predetermined direction and is attached to the opening surface 42 of the reflector 40. The light is emitted through the surface cover 50. At this time, the color conversion member 60 is provided in the opening region 43 substantially parallel to the optical axis Y of the LED package 20. For this reason, a part of the light emitted from the LED package 20 reaches the color conversion member 60 directly or via the reflector 40 and undergoes wavelength conversion. As a result, light in which the light of the LED package 20 and the light converted in wavelength by the color conversion member 60 are mixed can be extracted from the light emitting device 10.

  As described above, in the present embodiment, the plurality of color conversion members 60 can be held substantially perpendicular to the opening surface 42 in the opening region 43 by the slits 41 provided in the reflector 40 and can be detached. . Further, by changing the type and the number of the color conversion members 60, light having an arbitrary color temperature can be easily extracted. Further, since the color conversion member 60 is provided substantially perpendicular to the opening surface 42 of the reflector 40 (preferably perpendicular), when the light emitting device 10 is viewed from the irradiation surface side, the color conversion is performed even when the light is turned off. It is possible to easily obtain the light-emitting device 10 that is difficult to see the coloring due to the member 60 and has excellent design properties. Furthermore, when the color conversion member 60 is provided in parallel to the opening surface 42 of the reflector 40, the light distribution arranged by the reflector 40 is disturbed because the phosphor of the color conversion member 60 functions as a diffusing material. In the embodiment, since the color conversion member 60 is provided substantially perpendicularly to the opening surface 42, the light distribution by the reflector 40 can be substantially maintained, and the irradiation region can be efficiently irradiated with light. .

  In the present embodiment, since the phosphor that converts the color temperature by the wavelength conversion is used for the color conversion member 60, the color temperature can be efficiently changed as compared with the case where the color temperature is converted by absorption of a coloring material or the like. Can be converted.

  Further, since the surface cover 50 is provided on the opening surface 42, the light emitted from the LED package 20 is agitated in the opening region 43 by reflection by the reflector 40 and reflection such as surface reflection by the surface cover 50, and color conversion is performed. The ratio of the light reaching the member 60 increases, and the light color can be converted efficiently. Furthermore, since the stirring of light proceeds, the light emitting device 10 with less color unevenness can be obtained.

  Note that the material and shape of each constituent member in the present embodiment is merely an example, and the present invention is not limited to this, and can be implemented with appropriate modifications.

  For example, in the example shown in FIGS. 1A and 1B, the light emitting device 10 includes twelve LED packages 20, but may include only one LED package 20, or 2-11. Or 13 or more.

  In the example shown in FIGS. 1A and 1B, the light emitting device 10 includes twelve LED packages 20, and the concave portion of the reflector 40 is configured to correspond to each LED package 20. May be configured to surround all the LED packages 20 as one recess. Or you may comprise so that one recessed part may surround the one or several LED package 20 as a recessed part of a different number from the number of LED packages 20. FIG.

  Further, in the example shown in FIGS. 1A and 1B, the light emitting device 10 includes three color conversion members 60, but may include only one color conversion member 60, or 2 One or four or more sheets may be provided. Further, the light emitting device 10 may include a color conversion member 60 separated so as to correspond to one or a plurality of LED packages 20. For example, when the light emitting device 10 includes the color conversion member 60 corresponding to one LED package 20 and one concave portion of the reflector 40, the slits 41 of the reflector 40 are provided only on one side, not on both sides of the concave portion of the reflector 40. Only one end of the color conversion member 60 may be supported by the slit 41. At this time, the width of the slit 41 is made substantially the same as the thickness of the color conversion member 60 so that the slit 41 can fix the color conversion member 60 only on one side. The shape of the other end of the color conversion member 60 (the side opposite to the side inserted into the slit 41) may be a shape along the concave portion of the reflector 40. Thereby, light color can be converted evenly on both sides of the concave portion of the reflector 40. In the present embodiment, for example, by appropriately selecting the type and number of color conversion members 60 used for each LED package 20, light emission that suppresses deterioration in quality such as color unevenness due to variations in color of the LED package 20 is suppressed. Device 10 can be obtained.

  In the example shown in FIGS. 1A and 1B, the reflector 40 has the slit 41 in the longitudinal direction of the light-emitting device 10, but may have the slit 41 in the short direction. However, you may have in both a longitudinal direction and a transversal direction. In the case where the reflector 40 has the slits 41 in both the longitudinal direction and the short direction of the light emitting device 10, the slits 41 may be changed depending on the direction or the corresponding LED package 20 (that is, depending on the position). The number, width, depth, shape, etc. may be changed. By adopting such a configuration, it is possible to install different types (types) of color conversion members 60 in different modes (number, direction, etc.) depending on the application.

  Furthermore, in the example shown in FIGS. 1A and 1B, the LED packages 20 are arranged in one row. However, the arrangement method is not limited to this, and for example, the LED packages 20 are arranged in two rows or three or more rows. Alternatively, they may be arranged in a ring shape or any other shape. In accordance with this, the position, size, shape, and the like of the reflector 40, its slit 41, and the color conversion member 60 are appropriately changed. For example, assume that a plurality of LED packages 20 are arranged in a ring shape. In this case, for example, the same number of reflectors 40 are arranged in a ring shape to correspond to the LED package 20 on a one-to-one basis. Each reflector 40 is provided with a slit 41 so as to form a ring shape as a whole. The slits 41 are arranged in, for example, three rows as in the present embodiment, and for example, one color conversion member 60 can be inserted and removed from each. Even in the case where a plurality of LED packages 20 and corresponding reflectors 40 are arranged in a ring shape as in this example, the slits 41 can be provided in the linear direction. When the slits 41 are arranged in a plurality of rows, they may all be provided in the same direction (the plurality of slits 41 are arranged in parallel to each other). Or you may provide in a radial direction (it arrange | positions so that the some slit 41 may go to a center by planar view).

  The color conversion member 60 is not limited to a sheet mixed with a phosphor, and may be a material in which a colorant that absorbs light in an arbitrary wavelength range such as a pigment system or a dye system is mixed with a base material such as a resin. Further, the shape of the color conversion member 60 is not limited to a rectangular shape, and for example, a projection or the like may be provided for each position corresponding to the slit 41. In this case, it is easy to attach the color conversion member 60 by causing the protrusions or the like to be caught behind the slit 41, and the attached color conversion member 60 is less likely to be displaced in the longitudinal direction of the light emitting device 10. (There is no such thing as sliding on its own).

  As described above, in the present embodiment, the light emitting device 10 includes the LED package 20 that is a light source, the LED substrate 30 on which the LED package 20 is mounted, and the reflector 40 that controls the light emission direction of the LED package 20. Is provided. In the light emitting device 10, a color conversion member 60 that converts the color (color temperature) of light from the LED package 20 is provided in the opening region 43 of the reflector 40 substantially perpendicularly to the opening surface 42 of the reflector 40. Yes. By adopting such a configuration, the color (color temperature) of the light from the LED package 20 can be converted while the light distribution of the light emitting device 10 by the reflector 40 is substantially maintained. Further, the coloring of the light emitting device 10 due to the color conversion member 60 can be reduced. That is, in the light emitting device 10 using LEDs, the light color can be easily changed by using a detachable member, and the light emitting device 10 with high light controllability and design can be obtained.

Embodiment 2. FIG.
In the present embodiment, differences from the first embodiment will be mainly described.

  FIG. 3A is a perspective view of the light emitting device 15 according to the present embodiment, and FIG. 3B is an enlarged view of the vicinity of the hook portion 46 provided in the light emitting device 15. The light emitting device 15 can be equipped with the same surface cover 50 as in the first embodiment, but is omitted in the drawing.

  In this embodiment, as shown in FIGS. 3A and 3B, the slit 47 of the reflector 45 is not provided to the end of the reflector 45 on the exit surface (opening surface 42) side, and the end of the color conversion member 60 is hooked. A hooking portion 46 for holding is provided. The hook 46 is provided only above the slits 47 at both ends of the reflector 45. When the color conversion member 60 is attached, the color conversion member 60 is slid in one direction as shown by an arrow C in FIG. 3A, inserted into the slit 47 on one side, and then slid a certain amount in the opposite direction. It is also inserted into one slit 47.

  As described above, in the present embodiment, the reflector 45 has the hook portion 46 for hooking the end portion of the color conversion member 60 on the end portion of the slit 47 on the side close to the opening surface 42. The color conversion member 60 is inserted into the slit 47 of the reflector 45 and is further slid onto the hook portion 46 of the reflector 45 by sliding. Note that a hooking portion 46 is provided only above the slits 47 at both ends in the longitudinal direction of the light emitting device 15, and the other slits 41 are the same as those in the first embodiment.

  In the present embodiment, by providing the hooking portion 46, when the light emitting device 15 is installed with the irradiation surface facing downward (on the ceiling or the like), the color conversion member 60 is prevented from dropping when the front cover 50 is removed. be able to. Therefore, the safety of the light emitting device 15 is improved. Further, by providing a gap between the surface cover 50 and the color conversion member 60, it is possible to prevent the color conversion member 60 from being seen on the surface cover 50 when the light emitting device 15 is viewed from the irradiation surface side. Therefore, the design of the light emitting device 15 is also improved.

  Note that the material and shape of each constituent member in the present embodiment is merely an example, and the present invention is not limited to this. As described in the description of the first embodiment, the material can be changed as appropriate. It is.

  In the present embodiment, as in the first embodiment, the shape of the color conversion member 60 is not limited to a rectangular shape, and for example, a protrusion or the like may be provided at one or both ends in the longitudinal direction of the color conversion member 60. . In this case, the color conversion member 60 can be attached by inserting only the protrusions or the like into the slit 47 and hooking the hooks 46 instead of the entire end of the color conversion member 60. Therefore, the length of the slit 47 can be shortened.

  As mentioned above, although embodiment of this invention was described, you may implement combining 2 or more embodiment among these. Alternatively, one of these embodiments may be partially implemented. Or you may implement combining two or more embodiment among these partially.

  10, 15 Light emitting device, 20 LED package, 21 LED chip, 22 LED package substrate, 23 LED sealing resin, 30 LED substrate, 40, 45 reflector, 41, 47 slit, 42 opening surface, 43 opening region, 46 hook part 50 Surface cover, 60 color conversion member.

Claims (7)

A light source that emits light;
A reflector that has an aperture surface, reflects light emitted from the light source, and emits the light from the aperture surface;
A sheet-like color conversion member for converting the color of light emitted from the light source, the sheet surface being substantially perpendicular to the opening surface of the reflector on a side closer to the light source than the opening surface of the reflector. And a color conversion member installed on the light emitting device. The reflector has a slit for holding the color conversion member,
The light emitting device according to claim 1, wherein the color conversion member can be inserted into and removed from the slit of the reflector. The reflector further includes a hook portion for hooking an end portion of the color conversion member on an end portion of the slit close to the opening surface.
3. The light emitting device according to claim 2, wherein the color conversion member is inserted into a slit of the reflector and is further slid to be hooked on a hook portion of the reflector.   The light emitting device according to any one of claims 1 to 3, wherein the light emitting device includes a plurality of the color conversion members. The light emitting device includes a plurality of the color conversion members,
The reflector has a plurality of the slits,
4. The light emitting device according to claim 2, wherein each of the color conversion members can be inserted into and removed from each of the slits of the reflector.   The light emitting device according to claim 1, wherein the color conversion member includes a phosphor that emits different light when excited by light emitted from the light source. The light emitting device further includes:
The light-emitting device according to claim 1, further comprising a surface cover that has translucency and is installed so as to cover an opening surface of the reflector.

Images