JP2014022406A - Light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device which is smaller in size than conventional ones.SOLUTION: The light-emitting device includes a substrate, a plurality of light-emitting elements mounted on the substrate, a first resin surrounding the light-emitting elements, and a second resin separating a region surrounded by the first resin. The substrate has a recess below the first resin. A terminal end of the second resin is housed in the recess and is covered with the first resin.

Description

  The present invention relates to a light emitting device.

  Conventionally, there has been proposed a light emitting device in which a resin frame is provided in an annular shape on a substrate, a portion surrounded by the resin frame is divided into two or more areas by a resin partition, and a light emitting portion is formed in each area. (See Patent Document 1).

JP 2012-4519 A

  However, the conventional light emitting device is still large.

  Therefore, an object of the present invention is to provide a light emitting device that is smaller than the conventional one.

  According to the present invention, the above problem is solved by the following means. That is, a light emitting device including a substrate, a plurality of light emitting elements mounted on the substrate, a first resin surrounding the plurality of light emitting elements, and a second resin separating a region surrounded by the first resin. In the apparatus, the substrate has a recess on the lower side of the first resin, and the second resin has a terminal portion accommodated in the recess and covered with the first resin. This is a light-emitting device.

1 is a schematic perspective view of a light emitting device according to an embodiment of the present invention. It is a figure explaining the formation method of 1st resin and 2nd resin which concern on embodiment of this invention. It is a figure which compares the light-emitting device which concerns on embodiment of this invention, and the light-emitting device which concerns on a comparative example.

  EMBODIMENT OF THE INVENTION Below, the form for implementing this invention is demonstrated, referring attached drawing.

  FIG. 1 is a schematic perspective view of a light emitting device according to an embodiment of the present invention.

  As shown in FIG. 1, a light emitting device 10 according to an embodiment of the present invention includes a substrate 20, a plurality of light emitting elements 30 mounted on the substrate 20 (the light emitting element 30 includes a first sealing member 70 and a first sealing member 70). 2 is not covered in FIG. 1 because it is covered by the sealing member 80.) The first resin 40 surrounding the plurality of light emitting elements 30 and the second resin separating the region surrounded by the first resin 40 50, a first sealing member 70 and a second sealing member 80 covering the plurality of light emitting elements 30, and a wiring pattern 90 connected to the plurality of light emitting elements 30 provided on the substrate 20. Yes. The terminal portion of the second resin 50 is covered with the first resin 40.

  Here, the substrate 20 has a recess 60 below the first resin 40, and a terminal portion of the second resin 50 is accommodated in the recess 60. The reason is as follows.

  That is, in general, when a resin is applied, the resin is discharged from a nozzle and applied onto the substrate. However, since the resin has a certain viscosity, it cannot be immediately separated from the nozzle even after it has been applied in place. For this reason, excess resin adheres to the substrate, and an area on the substrate is wasted correspondingly.

  Therefore, in the light emitting device 10 according to the embodiment of the present invention, the substrate 20 has the recess 60 below the first resin 40. In this way, after stopping the discharge of the second resin from the nozzle, the terminal portion of the second resin 50 can be accommodated in the concave portion 60 (the terminal portion of the second resin 50 is formed in the concave portion 60). It adheres to the inner surface.)

  Accordingly, it is possible to store the excessive resin that has been adhered to the substrate 20 in the conventional case in the concave portion 60, so that the substrate 20 is downsized to provide a light emitting device that is smaller than the conventional one. be able to. In addition, as long as the terminal part of the 2nd resin 50 is accommodated in the recessed part 60, the one part (for example, most advanced part) may protrude from the inside of the recessed part 60.

  Hereinafter, the configuration of each member will be described in detail.

[substrate]
For the substrate 20, for example, ceramics (Al ₂ O ₃ , AlN, or the like), phenol resin, epoxy resin, polyimide resin, BT resin (bismaleimide triazine resin), polyphthalamide (PPA) resin, or the like can be used.

  The shape of the recess 60 included in the substrate 20 is not particularly limited, but the recess 60 preferably has a protrusion (not shown) on its inner surface (for example, the bottom surface of the recess 60). In this way, the end portion of the second resin 50 can be more reliably adhered in the recess 60 due to the resistance caused by the protrusion, so that the resin width of the first resin 40 can be further reduced. Moreover, the recessed part 60 can be provided only in the area | region corresponding to the terminal part of 2nd resin. The outer edge of the recessed part 60 seen from the top should just be larger than the outer edge of a nozzle, and can be made into a square, for example. Further, the depth of the concave portion is 20% or more and 80% or less, preferably 30% or more and 70% or less of the total thickness of the substrate 20 in consideration of the strength of the substrate 20 and the amount of the second resin. More preferably, it can be 40% or more and 60% or less.

[First resin, second resin]
The first resin 40 is a resin that surrounds the plurality of light emitting elements 30, and the second resin 50 is a resin that separates a region surrounded by the first resin 40.

For the first resin 40, for example, a light-reflective resin such as a phenol resin, an epoxy resin, a BT resin, a PPA resin, or a silicon resin containing a reflective member such as TiO ₂ , Al ₂ O ₃ , ZrO ₂ , or MgO is used. Can be used.

  For the second resin 50, for example, a light-reflecting resin or a light-transmitting resin such as a silicon resin, an epoxy resin, or a urea resin can be used.

  When a translucent resin is used for the second resin 50, a light-reflective resin is used for the first resin 40 so that light does not leak from the end portion of the second resin 50, thereby the end portion of the second resin 50. Must be sufficiently coated. In particular, when a part of the plurality of light emitting elements 30 is covered with the second resin 50 made of a translucent resin, the light from the light emitting elements 30 is easily transmitted through the second resin 50, and the end of the second resin 50. If the portion is exposed, the light leaks from it and the appearance is impaired during driving. However, according to the light emitting device 10 according to the embodiment of the present invention, it is possible to sufficiently cover the end portion of the second resin 50 in spite of the first resin 40 having a smaller resin width than the conventional one. Therefore, the light emitting device 10 that is excellent in appearance can be obtained.

  The second resin 50 may contain a colorant, a light diffusing agent, and the like. Further, if a translucent resin is used for the second resin 50, the light in a plurality of regions (a first region 20a, a second region 20b, a third region 20c, and a fourth region 20d, which will be described later) in the second resin 50. Can also be mixed.

  The region surrounded by the first resin 40 includes a first region 20a, a second region 20b, a third region 20c, and a fourth region 20d separated by the second resin 50. In the embodiment of the present invention, the shape of the region surrounded by the first resin 40 is a circle, but it may be a polygon such as a quadrangle, a hexagon, or an octagon. In addition, a mode in which the region surrounded by the first resin 40 is divided into four regions by the second resin 50 will be described. However, the region surrounded by the first resin 40 is divided into two regions by the second resin 50. It can be separated into three regions, or it can be separated into five or more regions.

[Light emitting element]
The light emitting element 30 is mounted in the first region 20a, the second region 20b, the third region 20c, the fourth region 20d, and a gap formed between these regions (a region where the second resin 50 is provided). . As the light emitting element 30, for example, various light emitting diodes that emit light such as blue, blue green, green, and red can be used.

  In the embodiment of the present invention, a light-emitting element that emits blue light is used as the light-emitting element 30 mounted in the first region 20a to the fourth region 20d, and a gap (second resin 50 is provided) generated between the regions. A light emitting element that emits blue-green light is used as the light emitting element 30 mounted in the region.

  The light emitting elements 30 mounted in the first region 20a and the third region 20c are for exciting a first phosphor (not shown) included in the first sealing member 70, and the second region 20b and the second region 20c. The light emitting element 30 mounted in the four regions 20d is for exciting a second phosphor (not shown) included in the second sealing member 80. Further, the light emitting element 30 mounted in the gap (area where the second resin 50 is provided) generated between the areas is for further improving the color rendering properties.

  Note that the above is an example, and in what region the light emitting element that emits light of which color may be mounted may be determined by comprehensively considering luminance, color rendering, and the like of the entire light emitting device.

[Phosphor, sealing member]
The light emitting elements 30 mounted in the first region 20a and the third region 20c are sealed by a first sealing member 70 containing a first phosphor (not shown), and the second region 20b and the fourth region 20d. The light emitting element 30 mounted on is sealed with a second sealing member 80 containing a second phosphor (not shown).

  For example, a YAG phosphor that emits yellow light can be used as the first phosphor (not shown), and a CASN phosphor that emits red light can be used as the second phosphor (not shown). . In this way, since a plurality of phosphors having different emission colors are not mixed in one region, double excitation of the phosphors is suppressed, and a light emitting device with high luminance can be provided. Further, since two types of phosphors (yellow and red) having different emission colors are used as the entire light emitting device, it is possible to provide a light emitting device capable of obtaining a certain color rendering property.

  Silicon resin, epoxy resin, urea resin, or the like can be used as the sealing member of the first sealing member 70 or the second sealing member 80. In addition, you may make these sealing members contain a coloring agent, a light-diffusion agent, etc. Different types of sealing members may be used for the first sealing member 70 and the second sealing member 80.

[Wiring pattern]
As the wiring pattern 90, Au or the like can be used.

[Production method]
FIG. 2 is a diagram illustrating a method for forming the first resin and the second resin according to the embodiment of the present invention.

(First step)
First, as shown in FIG. 2A, the nozzle 100 that discharges the second resin 50 is kept at a certain distance from the substrate 20 from the inside to the outside of the region that is to be surrounded by the first resin 40. Move. As a result, the second resin 50 is applied from the inside to the outside of the region that is to be surrounded by the first resin 40.

(Second step)
Next, as shown in FIG. 2B, the discharge of the second resin 50 from the nozzle 100 is stopped above the recess 60.

(Third step)
Next, as shown in FIGS. 2 (3), (4), and (5), the excess second resin 50 is accommodated in the recess 60 (the excess second resin 50 adheres to the inner surface of the recess 60). ), The second resin 50 is separated from the nozzle 100. At this time, it is preferable that the nozzle is once lowered to the vicinity of the bottom surface of the recess so that the second resin 50 easily adheres to the recess 60. If the outer side surface of the recess 60 has the inclined surface 61, even when the substrate 20 is warped and the nozzle 100 contacts the side surface of the recess 60, the deformation or breakage of the nozzle 100 is alleviated. can do.

(4th process)
And after apply | coating the several 2nd resin 50 on the board | substrate 20 by repeating a 3rd process from a 1st process (At this time, the start end part of the several 2nd resin 50 is connected), FIG. 2 (6). As shown, the first resin 40 is applied onto the substrate 20, and the terminal portion of the second resin 50 is covered with the first resin 40.

[Comparison]
FIG. 3 is a diagram comparing the light emitting device according to the embodiment of the present invention and the light emitting device according to the comparative example, and FIG. 3A shows the light emitting device according to the embodiment of the present invention, and FIG. ) Shows a light emitting device according to a comparative example.

  As shown in FIG. 3, in the light emitting device (a) according to the embodiment of the present invention, the terminal portion of the second resin 50 is accommodated in the recess 60, whereas the light emitting device (b) according to the comparative example. Then, the terminal portion of the second resin 50 is adhered to the substrate 20 for a long time.

  According to the light emitting device (a) according to the embodiment of the present invention, it is possible to reduce the region S where excessive resin is adhered to the light emitting device (b) according to the comparative example. A small light-emitting device can be provided by downsizing.

  As mentioned above, although embodiment of this invention was described, these description is related with an example of this invention, and this invention is not limited at all by these description.

DESCRIPTION OF SYMBOLS 10 Light-emitting device 20 Board | substrate 20a 1st area | region 20b 2nd area | region 20c 3rd area | region 20d 4th area | region 30 Light-emitting element 40 1st resin 50 2nd resin 60 Recess 61 Inclined surface 70 1st sealing member 80 2nd sealing member 90 Wiring pattern 100 Nozzle

Claims (5)

A light emitting device comprising: a substrate; a plurality of light emitting elements mounted on the substrate; a first resin that surrounds the plurality of light emitting elements; and a second resin that separates a region surrounded by the first resin. There,
The substrate has a recess on the lower side of the first resin,
The second resin has a terminal portion housed in the recess and covered with the first resin.
A light emitting device characterized by that.   2. The light emitting device according to claim 1, wherein the first resin is a light reflecting resin, and the second resin is a light transmitting resin.   3. The light emitting device according to claim 2, wherein a part of the plurality of light emitting elements is covered with the second resin.   The light emitting device according to claim 1, wherein the concave portion has a protrusion on an inner surface thereof. The region surrounded by the first resin has a first region and a second region separated by the second resin,
The light emitting device mounted in the first region is sealed by a first sealing member containing a first phosphor,
The light emitting device mounted in the second region is sealed by a second sealing member containing a second phosphor.
The light-emitting device according to claim 1, wherein the light-emitting device is a light-emitting device.

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