JP6180101B2 - Light emitting device - Google Patents

Description

  The present invention relates to a light emitting device.

  There is a light emitting device in which a correlated color temperature is changed by covering a light source such as an LED with a phosphor-containing resin or the like. As the phosphor-containing resin, for example, a resin previously formed into a sheet shape is used.

JP 2008-53590 A JP 2008-235824 A JP 2011-249573 A

When the correlated color temperature of the light emitted from the light source varies, or when it is desired to manufacture a plurality of types of light emitting devices that emit light having different correlated color temperatures, it is necessary to change the amount of the phosphor.
When using a phosphor-containing resin that has been molded into a sheet in advance, it is necessary to prepare a plurality of types of sheets having different phosphor contents or to process the sheet.
When using a phosphor-containing resin that is not molded in advance, the amount of the phosphor can be changed by changing the amount of the resin, but it may be difficult to accurately control the amount of the resin.

  An object of the present invention is to easily set a correlated color temperature of light emitted from a light emitting device to a desired correlated color temperature, for example.

  The light emitting device according to the present invention includes a light source and a cover portion, and the cover portion includes a plurality of convex portions on the inside, is formed of a transparent material, and covers the light source, and the transparent cover And a resin containing a phosphor, which is provided around the plurality of convex portions.

  According to the light emitting device of the present invention, the correlated color temperature of the light emitted from the light emitting device can be easily set to a desired correlated color temperature.

FIG. 3 is a perspective view showing an appearance of lighting apparatus 10 according to Embodiment 1. FIG. 3 is a front view illustrating a structure of the light emitting module 12 according to the first embodiment. FIG. 3 is a three-view diagram (a front view, a side view, and a plan view) showing a structure of the light emitting unit 23 in the first embodiment. FIG. 3 is a three-view diagram (a front view, a side view, and a plan view) showing a structure of a light source 31 in the first embodiment. FIG. 4 is a four-side view (a front view, a side view, a plan view, and a bottom view) showing the structure of the cover 34 in the first embodiment. Sectional drawing which shows the structure of the cover part 34 in Embodiment 1. FIG. Sectional drawing which shows the structure of the cover part 34 in Embodiment 1. FIG. FIG. 6 is a diagram for explaining a correlated color temperature of light emitted from the light emitting unit in the first embodiment. FIG. 6 shows a manufacturing process of the cover portion 34 in the first embodiment. FIG. 5 is a diagram showing a manufacturing process of the cover part 34 in the first embodiment.

Embodiment 1 FIG.
The first embodiment will be described with reference to FIGS.

  FIG. 1 is a perspective view showing the appearance of the illumination device 10 in this embodiment.

The illumination device 10 includes, for example, a housing 11, a light emitting module 12, and a lighting device (not shown).
The housing 11 has, for example, a substantially rectangular parallelepiped box shape and has an opening.
The light emitting module 12 is built in the housing 11. The light emitting module 12 has a light emitting unit (see FIG. 2). The light emitting unit emits light by power supplied from the lighting device. Light emitted from the light emitting unit is radiated to the outside through the opening of the housing 11.

  FIG. 2 is a front view showing the structure of the light emitting module 12 in this embodiment.

The light emitting module 12 (light emitting device) includes, for example, a heat radiating member 21 and a plurality of electric wires 22a to 22j (hereinafter sometimes simply referred to as “electric wires 22”. And a plurality of fixing members 24.
The light emitting units 23a to 23i are, for example, arranged linearly and adjacent to each other with almost no gap. In addition, the structure arrange | positioned along with planar shape may be sufficient as the light emission units 23a-23i.
One end of the electric wire 22a (wiring) is electrically connected to the light emitting unit 23a. The other end of the electric wire 22a is electrically connected to the lighting device. The electric wire 22b is electrically connected between the light emitting unit 23a and the light emitting unit 23b. The electric wire 22c is electrically connected between the light emitting unit 23b and the light emitting unit 23c. The electric wire 22d is electrically connected between the light emitting unit 23c and the light emitting unit 23d. The electric wire 22e is electrically connected between the light emitting unit 23d and the light emitting unit 23e. The electric wire 22f is electrically connected between the light emitting unit 23e and the light emitting unit 23f. The electric wire 22g is electrically connected between the light emitting unit 23f and the light emitting unit 23g. The electric wire 22h is electrically connected between the light emitting unit 23g and the light emitting unit 23h. The electric wire 22i is electrically connected between the light emitting unit 23h and the light emitting unit 23i. One end of the electric wire 22j is electrically connected to the light emitting unit 23i. The other end of the electric wire 22j is electrically connected to the lighting device. Thereby, the light emission units 23a-23i are electrically connected in series.
The fixing member 24 is, for example, a screw. The fixing member 24 fixes the light emitting unit 23 in close contact with the heat radiating member.
The heat radiating member 21 radiates heat generated in the light emitting unit 23. The heat radiating member 21 is, for example, a heat sink. The heat radiating member 21 may be the casing 11 of the lighting device 10 itself.

  FIG. 3 is a three-view diagram (a front view, a side view, and a plan view) showing the structure of the light-emitting unit 23 in this embodiment.

The light emitting unit 23 (light emitting device) includes, for example, a light source 31 and a cover portion 34.
The light source 31 emits light by power supplied from the lighting device.
The cover part 34 (holder) covers the light source 31.

  FIG. 4 is a three-view drawing (front view, side view, plan view) showing the structure of the light source 31 in this embodiment.

The light source 31 is, for example, an LED light source of a COB (Chip on Board) package in which a plurality of LED chips are directly mounted on the substrate 311. The light source 31 includes, for example, a substrate 311, a light emitting unit 312, two printed wirings 313 a and 313 b, two connection units 314 a and 314 b, and a frame 315.
The substrate 311 is a printed wiring board, for example, and is formed of a material having high thermal conductivity.
The frame 315 is provided on the surface of the substrate 311 so as to surround the light emitting unit 312. The frame 315 is made of silicon, for example.
The light emitting unit 312 emits light. The light emitting unit 312 includes a plurality of LED elements (not shown) and a phosphor layer (not shown). The plurality of LED elements are bonded on the substrate 311. The plurality of LED elements are electrically connected in series or in parallel. The plurality of LED elements are connected by, for example, gold wire or flip chip mounting. The plurality of LED elements emit blue light, for example. The phosphor layer is formed, for example, by filling a resin containing a yellow phosphor inside the frame 315 and curing the resin. The phosphor layer covers the plurality of LED elements. The phosphor contained in the phosphor layer is excited by the light emitted from the plurality of LED elements and emits fluorescence. The light emitting unit 312 emits pseudo white light in which light emitted from a plurality of LED elements and fluorescence emitted from a phosphor are mixed.
The connection part 314 is a part to which the electric wire 22 is connected. The connection part 314 is a pad which solders the electric wire 22, for example. Alternatively, the connection unit 314 may be a connector that connects the electric wires 22. The connection unit 314 inputs electric power supplied from the lighting device via the connected electric wire 22. The connection part 314 is provided outside the frame 315.
The printed wiring 313a electrically connects the connection unit 314a and the LED element of the light emitting unit 312. The printed wiring 313b electrically connects the connection portion 314b and the LED element of the light emitting portion 312.

FIG. 5 is a four-view diagram (a front view, a side view, a plan view, and a bottom view) showing the structure of the cover portion 34 in this embodiment.
FIG. 6 is a cross-sectional view showing the structure of the cover portion 34 in this embodiment.
This figure shows the AA cross section shown in FIG.
FIG. 7 is a cross-sectional view showing the structure of the cover portion 34 in this embodiment.
This figure shows a BB cross section shown in FIG.

  The cover part 34 (cover material) includes, for example, a transparent cover 45 and a phosphor resin 41.

The transparent cover 45 is formed of a transparent material such as acrylic, polycarbonate, silicone, or glass. The transparent cover 45 covers the light source 31. The transparent cover 45 includes, for example, a front part 51, four side parts 52a to 52d, four flange parts 53a to 53d, four claw parts 55a to 55d, and a plurality of convex parts 56.
The front part 51 has a substantially rectangular plate shape. The cover part 34 is disposed so that the front part 51 is substantially parallel to the substrate 311 of the light source 31.
The side surface portion 52a has a substantially rectangular plate shape. One side of the side part 52 a is connected to one side of the front part 51. The side part 52 a is substantially perpendicular to the front part 51. The side part 52a has the electric wire insertion part 521a. The electric wire insertion part 521a is a notch for allowing the electric wire 22 to pass therethrough.
The side part 52b is a substantially rectangular plate shape. One side of the side surface part 52 b is connected to one side of the front part 51. The side part 52b is opposed to the side part 52a. The side part 52b is substantially perpendicular to the front part 51 and is substantially parallel to the side part 52a. The side part 52b has the electric wire insertion part 521b. The electric wire insertion part 521b is a notch for allowing the electric wire 22 to pass therethrough.
The side part 52c has a substantially rectangular plate shape. The side part 52c has one side connected to one side of the front part 51, the other side connected to one side of the side part 52a, and the other side connected to one side of the side part 52b. The side surface portion 52c is substantially perpendicular to the front surface portion 51 and the side surface portions 52a and 52b.
The side part 52d has a substantially rectangular plate shape. The side part 52d has one side connected to one side of the front part 51, the other side connected to one side of the side part 52a, and the other side connected to one side of the side part 52b. The side surface portion 52d faces the side surface portion 52c. The side surface portion 52d is substantially perpendicular to the front surface portion 51 and the side surface portions 52a and 52b, and is substantially parallel to the side surface portion 52c.

The collar portion 53a has a substantially rectangular plate shape. One side of the collar portion 53a is connected to one side of the side surface portion 52a. The flange portion 53 a is substantially perpendicular to the side surface portion 52 a and is substantially parallel to the front surface portion 51. The collar portion 53a has a fixed engagement portion 531a. The fixed engagement portion 531 a is a notch that engages with the fixed member 24.
The collar portion 53c has a substantially rectangular plate shape. One side of the collar portion 53c is connected to one side of the side surface portion 52a. The collar portion 53c is substantially flush with the collar portion 53a. The flange portion 53a and the flange portion 53c are separated by a wire insertion portion 521a.
The collar portion 53b has a substantially rectangular plate shape. One side of the collar portion 53b is connected to one side of the side surface portion 52b. The collar part 53b is substantially flush with the collar part 53a and the collar part 53c. The collar portion 53b has a fixed engagement portion 531b. The fixed engagement portion 531 b is a notch that engages with the fixed member 24.
The collar portion 53d has a substantially rectangular plate shape. One side of the collar portion 53d is connected to one side of the side surface portion 52b. The collar part 53d is substantially flush with the collar part 53a, the collar part 53b, and the collar part 53c. The flange portion 53b and the flange portion 53d are separated by a wire insertion portion 521b.

  The claw portion 55 is a protrusion that contacts the substrate 311 of the light source 31 and presses the light source 31 against the heat radiating member 21. For example, the claw portion 55 has a substantially triangular prism shape. The claw portion 55a is provided inside the side surface portion 52a. The claw portion 55b is provided inside the side surface portion 52b. The claw portion 55c is provided inside the side surface portion 52c. The claw portion 55d is provided inside the side surface portion 52d.

  The convex portion 56 is a protrusion provided inside the front portion 51. The plurality of convex portions 56 are regularly or irregularly distributed over the substantially entire surface of the front portion 51 and arranged in a planar shape. The shape of the convex part 56 is hemispherical, for example. In addition, the shape of the convex part 56 is not restricted to a hemispherical shape, For example, other shapes, such as truncated cone shape, may be sufficient.

  The phosphor resin 41 (resin) is formed of a resin containing, for example, a red or yellow phosphor inside the transparent cover 45. The phosphor resin 41 is provided so as to surround the periphery of the plurality of convex portions 56. In addition, the convex part 56 may have a configuration in which the top part is exposed in an island shape from the phosphor resin 41 as in this example, or the convex part 56 is buried in the phosphor resin 41. Also good.

  FIG. 8 is a diagram for explaining the correlated color temperature of the light emitted by the light emitting unit 23 in this embodiment.

  The phosphor contained in the phosphor resin 41 is excited by the blue light emitted by the LED element among the mixed light emitted by the light source 31 and emits fluorescence. Thereby, the light emitting unit 23 emits light having a correlated color temperature lower than the mixed light emitted by the light source 31.

Like the light 61, the light radiated to the outside through the convex portion 56 without passing through the phosphor resin 41 has a correlated color temperature as radiated by the light source 31.
Like the light 62, the light emitted outside through the phosphor resin 41 without passing through the convex portion 56 has a correlated color temperature lower than the light emitted by the light source 31.
Like the light 63, the light emitted outside through the phosphor resin 41 and the convex portion 56 has a correlated color temperature lower than the light emitted by the light source 31. However, as compared with the light 62, the layer of the fluorescent resin resin 41 passing therethrough has a higher correlated color temperature due to the thinner layer.

  The light emitted from the light emitting unit 23 is a mixed light of these lights.

As the number of the convex portions 56 increases, and as the size of the convex portions 56 increases, the light 61 is radiated to the outside through the convex portions 56 without passing through the phosphor resin 41 as in the light 61. The proportion of light increases. For this reason, the correlated color temperature of the light emitted from the light emitting unit 23 is relatively high.
Conversely, the smaller the number of convex portions 56 and the smaller the size of the convex portions 56, the light 62 does not pass through the convex portions 56 and passes through the phosphor resin 41 to the outside. Increases the proportion of light emitted. For this reason, the correlated color temperature of the light emitted from the light emitting unit 23 is relatively low.

  For example, as the light emitted from the light emitting unit 23, “bulb color”, “warm white”, “white”, “daylight” defined in Japanese Industrial Standard “Classification by Fluorescent Lamp Light Source Color and Color Rendering” (JIS Z9112: 2004) In order to obtain “white” or “daylight” light, a light source 31 that emits light having a correlated color temperature higher than the desired light is used. Thereby, the light emission unit 23 which has a desired light source color can be manufactured.

  Further, for example, if the light source 31 of “daylight color” is covered with a cover portion 34 having a large number of convex portions 56 or a large size of the convex portions 56, “day white” or “white” light emission is performed. The unit 23 can be obtained, and if the cover part 34 having a small number of convex parts 56 or a small size of the convex parts 56 is covered, the light emitting unit 23 of “warm white” or “bulb color” can be obtained. Can do.

Further, there is some variation in the correlated color temperature of the light emitted from the light source 31.
Therefore, when the correlated color temperature of the light source 31 is relatively high, the number of the convex portions 56 is increased or the size of the convex portions 56 is increased. On the contrary, when the correlated color temperature of the light source 31 is relatively low, the number of the convex portions 56 is reduced or the size of the convex portions 56 is reduced.
Thereby, the correlated color temperature of the light emitted from the light emitting unit 23 can be made substantially uniform.

  FIG. 9 is a diagram showing a manufacturing process of the cover portion 34 in this embodiment.

The cover part manufacturing process 70 includes, for example, a color measurement process 71, a convex calculation process 72, a convex formation process 73, and a resin formation process 74.
In the color measurement step 71, the light source 31 to which the cover portion 34 is to be attached is turned on, and the correlated color temperature or chromaticity coordinates are measured.
In the convex portion calculating step 72, the number and size of the convex portions 56 to be provided on the cover portion 34 are calculated based on the result measured in the color measuring step 71.
In the convex portion forming step 73, the convex portion 56 is formed inside the front portion 51 of the transparent cover 45 based on the result calculated in the convex portion calculating step 72.
In the resin forming step 74, the phosphor resin 41 is formed inside the transparent cover 45 on which the convex portions 56 are formed in the convex portion forming step 73.

  FIG. 10 is a diagram showing a manufacturing process of the cover portion 34 in this embodiment.

  The transparent cover 45 ′ is a part for manufacturing the transparent cover 45. The transparent cover 45 ′ is different from the transparent cover 45 in that it does not have the convex portion 56 and the inside of the front portion 51 is flat.

  In the convex portion forming step 73, the convex portion 56 is formed and cured with a transparent material such as transparent silicon inside the front portion 51 of the transparent cover 45 'to manufacture the transparent cover 45.

  In the resin forming step 74, a predetermined amount of phosphor resin 41 containing a predetermined amount of phosphor is poured into the transparent cover 45 and cured to manufacture the cover portion 34.

  As described above, the convex portion 56 is provided inside the transparent cover 45, and the phosphor resin 41 is provided around the convex portion 56, whereby the correlation color temperature of the light emitted from the light emitting unit 23 is correlated with the correlation of the light emitted from the light source 31. Lower than the color temperature. Thereby, the light emission unit 23 which radiates | emits the light of various correlation color temperature can be manufactured easily.

  In addition, the correlated color temperature and chromaticity coordinates of the light emitted from the light source 31 are measured, and the number and size of the convex portions 56 are adjusted based on the measurement result, thereby correlating the light emitted from the light source 31. The correlated color temperature of the light emitted from the light emitting unit 23 can be made substantially uniform by absorbing the temperature variation.

  In order to adjust the correlated color temperature of the light emitted from the light emitting unit 23, the amount of the phosphor 56 is not adjusted, the amount of the phosphor contained in the phosphor resin 41 is adjusted. Since the size is adjusted, it is relatively easy to adjust the correlated color temperature, and the manufacturing cost of the light emitting unit 23 can be suppressed.

  Further, when a COB package is used as the light source 31, the light emitting unit 312 is smaller than the substrate 311 because the connection unit 314 and the like are provided around the light emitting unit 312. For this reason, when a plurality of light sources 31 are arranged side by side, a gap is formed between the light emitting units 312. However, when the cover portion 34 covers the light source 31, the entire front portion 51 of the transparent cover 45 becomes a light emitting surface. Since the cover part 34 covers the whole substrate 311 or at least the light emitting part 312 and the connecting part 314 and is arranged adjacent to each other with almost no gap, the light emitting surfaces appear to be connected without gaps.

  Further, since the transparent cover 45 is fixed to the heat radiating member 21 with the light source 31 sandwiched between it and the heat radiating member 21, and the light source 31 is pressed against the heat radiating member 21, the light source 31 can be brought into close contact with the heat radiating member 21. The heat generated in can be efficiently radiated.

  The material of the convex portion 56 may be different from the material of the transparent cover 45 ′, but by using the same material as the transparent cover 45 ′, light attenuation at the boundary between the convex portion 56 and the front portion 51 can be achieved. It can be suppressed and desirable.

  The configuration described above is an example, and other configurations may be used. For example, a configuration in which a configuration of a non-essential part is replaced with another configuration may be used.

  DESCRIPTION OF SYMBOLS 10 Illuminating device, 11 housing | casing, 12 light emission module, 21 heat dissipation member, 22 electric wire, 23 light emission unit, 24 fixing member, 31 light source, 311 board | substrate, 312 light emission part, 313 printed wiring, 314 connection part, 315 frame, 34 cover Part, 41 phosphor resin, 45 transparent cover, 51 front part, 52 side part, 521 electric wire insertion part, 53 collar part, 531 fixed engagement part, 55 claw part, 56 convex part, 61-63 light, 70 cover part Manufacturing process, 71 Color measurement process, 72 Convex part calculation process, 73 Convex part formation process, 74 Resin formation process.

Claims (6)

A light source and a cover,
The cover part
A plate-shaped front part, a side part surrounding the periphery of the front part, and a plurality of convex parts provided on the inner side of the front part, formed of a transparent material that does not contain a phosphor, and the light source A transparent cover to cover,
A light-emitting device comprising: a resin that is provided from the inner surface of the front portion to a certain height around the plurality of convex portions inside the front portion and contains a phosphor. 2. The light emitting device according to claim 1, wherein a top portion of each of the plurality of convex portions is exposed from the resin, or a top portion is buried in the resin. 3. The light emitting device according to claim 1, wherein the plurality of convex portions gradually increase in cross-sectional area in a cross section parallel to the inner surface of the front portion from the top toward the front portion.   The plurality of convex portions are provided with at least one of a size and a number determined based on correlated color temperature or chromaticity coordinates of light emitted from the light source. 4. The light emitting device according to any one of 1 to 3. The light emitting device has a plurality of the light sources and the same number of the cover portions as the light sources,
Each of the above light sources
A light emitting unit that emits light;
A connection portion that is located around the light emitting portion and connected to a wiring that supplies power for causing the light emitting portion to emit light to the light source;
The plurality of light sources are arranged in a linear shape or a planar shape,
Each said cover part is provided adjacent to the other cover part which covers the said other light source located next to the said corresponding light source, covering the said light emission part and the said connection part of the said corresponding light source. The light emitting device according to claim 1, wherein the light emitting device is a light emitting device. The light emitting device has a heat radiating member that radiates heat generated by the light source,
The said transparent cover is fixed to the said heat radiating member, pinching | interposing the said light source between the said heat radiating members, The said light source is pressed against the said heat radiating member, The said any one of Claim 1-5 characterized by the above-mentioned. The light-emitting device of description.

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