JP2018195778A - Light emitting device - Google Patents

Abstract

To provide a light emitting device capable of efficiently extracting light emitted from a light emitting element and to make it possible to prevent light extracted from the light emitting device from generating color unevenness.SOLUTION: The light emitting device includes: a substrate 1; a plurality of light emitting elements 2 mounted on the substrate 1; and a resin body 3 containing a fluorescent substance for integrally sealing the plurality of light emitting elements 2. In the resin body 3, a V-shaped groove 4 surrounding each light emitting element 2 in a circle is formed. A resin sealing body 5 for sealing each light emitting element 2 in the inner area surrounded by the V-shaped groove 4 is formed. Each of the resin sealing bodies 5 has an upper surface 5a with the light emitting element 2 as a center and a peripheral side surface 5b as a tapered surface.SELECTED DRAWING: Figure 1A

Description

  The present invention relates to a light emitting device having a plurality of light emitting elements.

  A light-emitting device having a light-emitting diode (LED) element as a light-emitting element is used as, for example, a mobile terminal such as a smartphone or a flash light-emitting device for photographing. Further, it is used in various display devices as a light emitting device for a backlight of a color display device. Furthermore, the light-emitting device which has an LED element is mounted also in the indoor lighting fixture and the outdoor lighting fixture. In recent years, light emitting devices having LED elements are also used in lighting fixtures such as in-vehicle lamps and projectors that require high luminance.

  In a light emitting device that requires high luminance, a necessary light flux is obtained by mounting a plurality of LED elements on a substrate (see, for example, Patent Document 1). In this light emitting device, a plurality of LED elements are arranged on an upper surface of a substrate, and the plurality of LED elements are integrally sealed with a flat light transmitting portion made of a resin body, and a central portion having a high lens height is formed on the flat light transmitting portion A lens and a peripheral lens having a low lens height are formed.

Japanese Patent Laid-Open No. 2006-146452

  In the light emitting device of Patent Document 1, a plurality of LED elements are sealed with a flat light-transmitting portion whose upper surface is flat. Therefore, when the light emitted from each LED element is wavelength-converted by the planar light transmitting portion and extracted from the upper surface, the light is equalized on the upper surface of the planar light transmitting portion due to a difference in refractive index between the planar light transmitting portion and the lens. Part is reflected. As a result, the light extraction efficiency from the planar light transmitting part is lowered. Further, the light emitted from the LED element has various distances until it is extracted from the upper surface of the planar light transmitting portion. As a result, in order to extract white light from the planar light transmitting portion, when a yellowish fluorescent material is mixed in the planar light transmitting portion, the distance from the top surface of the planar light transmitting portion to the light is extracted. Long light may appear yellowish, causing uneven color.

  One object of the light emitting device according to the present invention is to efficiently extract light emitted from the light emitting element. Another object of the present invention is to prevent uneven color in light extracted from the light emitting device.

  A light-emitting device according to the present invention includes a substrate, a plurality of light-emitting elements mounted on the substrate, and a resin sealing body containing a phosphor that seals the plurality of light-emitting elements. A plurality of sealing bodies are provided for each light emitting element, and each resin sealing body has an upper surface centering on the light emitting element and a tapered surface provided on the periphery of the upper surface.

  The light-emitting device according to an embodiment of the present invention includes a resin body containing a phosphor that integrally seals a plurality of light-emitting elements, and the resin body has a concave groove that surrounds each light-emitting element in a circular shape. Each of the resin sealing bodies is formed and formed in an inner area surrounded by the concave grooves. The concave groove may have a substantially V-shaped cross section, and each of the resin sealing bodies may be formed in a truncated cone shape or a dome shape.

  Moreover, in the light-emitting device which concerns on other embodiment of this invention, you may have a some resin sealing body and the resin body containing the white pigment with which it fills between each resin sealing body. .

  According to the light emitting device of the present invention, a plurality of light emitting elements are sealed with a resin sealing body for each light emitting element, and each resin sealing body is provided on the upper surface around the light emitting element and the periphery of the upper surface. Therefore, the light emitted from the light emitting element is easily extracted from the upper surface and the tapered surface of the resin sealing body. Therefore, the light extraction efficiency from the resin sealing body can be increased.

  In addition, according to the light emitting device of the present invention, since the periphery of the resin sealing body is surrounded by the concave groove, the light emitted from the light emitting element is substantially equidistant from the upper surface and the taper of the resin sealing body. Removed from the surface. That is, most of the light emitted from the light emitting element travels through the resin sealing body by substantially the same distance and is extracted outside. As a result, no color unevenness occurs in the light extracted from the resin sealing body.

  Furthermore, according to the light emitting device according to the present invention, since it has a plurality of resin sealing bodies and a resin body containing a white pigment filled between the resin sealing bodies, Part of the emitted light is reflected by the resin body containing the white pigment. As a result, the light emitted from the light emitting element can be taken out efficiently.

It is a top view of the light-emitting device concerning a 1st embodiment of the present invention. It is II sectional drawing of FIG. 1A. It is sectional drawing which shows one modification of a V-shaped groove. It is sectional drawing which shows the other modification of V-shaped groove. It is a top view of the light-emitting device concerning a 2nd embodiment of the present invention. It is II-II sectional drawing of FIG. 2A. It is a top view of the light-emitting device concerning a 3rd embodiment of the present invention. It is a III-III sectional view of Drawing 3A. It is a top view of the light-emitting device concerning a 4th embodiment of the present invention. It is IV-IV sectional drawing of FIG. 4A. It is a top view of the light-emitting device concerning a 5th embodiment of the present invention. It is VV sectional drawing of FIG. 5A.

  Hereinafter, embodiments of a light emitting device according to the present invention will be described in detail with reference to the drawings. The drawings schematically represent the light emitting device of the present invention. These actual dimensions and dimension ratios do not necessarily match the dimensions and dimension ratios in the drawings. In addition, duplicate descriptions may be omitted as appropriate, and the same symbols may be assigned to the same members. Furthermore, it should be noted that the technical scope of the present invention is not limited to the embodiments described below, but extends to the invention described in the claims and equivalents thereof.

(First embodiment)
1A and 1B show a light emitting device 10 according to a first embodiment of the present invention. The light emitting device 10 includes a rectangular substrate 1, a plurality of light emitting elements 2 mounted on the upper surface of the substrate 1, and a resin body 3 that integrally seals the plurality of light emitting elements 2.

  The substrate 1 is an insulating substrate made of glass epoxy resin, and a circuit pattern (not shown) is formed on the upper surface thereof. A plurality of light emitting elements 2 are mounted on the upper surface 1 a of the substrate 1. In FIG. 1, four light emitting elements 2 are shown for convenience. As the light emitting element 2, a chip type LED element may be used. The light emitting element 2 has a light emitting surface on the upper surface 2 a side, and the lower surface 2 b is bonded to the substrate 1. The light emitting element 2 may have a first element electrode and a second element electrode on the lower surface 2b. The light emitting element 2 may be electrically connected to the electrode of the substrate 1 with two metal leads.

  A resin body 3 that integrally seals the plurality of light emitting elements 2 is provided on the substrate 1. The resin body 3 can be formed of an epoxy resin or a silicon resin. The resin body 3 may contain a phosphor. For example, YAG (yttrium, aluminum, garnet) can be used as this phosphor when white light is extracted. In addition to YAG, various types of phosphors can be used. The resin body 3 is formed in a circular shape in plan view so as to surround the four light emitting elements 2. The height of the upper surface 3a of the resin body 3 is not particularly limited as long as it is high enough to hide the upper surface 2a of the light emitting element 2.

  A concave groove 4 is formed in the resin body 3 so as to surround each light emitting element 2. The concave groove 4 is provided in a circle around the light emitting element 2. In this embodiment, the concave groove 4 is composed of a V-shaped groove 4 having a substantially V-shaped cross section. The V-shaped groove 4 has a pair of opposed slopes 4a and 4b. Both the element-side inclined surface 4a and the outer inclined surface 4b are linearly formed. A resin sealing body 5 for sealing each light emitting element 2 is formed in the inner area surrounded by the V-shaped groove 4. The resin sealing body 5 has an upper surface 5 a centering on the light emitting element 2 and a peripheral side surface 5 b surrounding the light emitting element 2, and the peripheral side surface 5 b is a slope 4 a on the element side of the V-shaped groove 4. And in common. Thus, the resin sealing body 5 is formed in a truncated cone shape by the circular upper surface 5 a and the slope 4 a on the element side of the V-shaped groove 4. In the resin sealing body 5, the peripheral side surface 5 b common to the element-side inclined surface 4 a of the V-shaped groove 4 forms a tapered surface at the periphery of the upper surface 5 a. In this embodiment, a tapered surface is formed not only on the periphery of the upper surface 5a but also on the entire peripheral side surface 5b. The height of the upper surface 5 a of the resin sealing body 5 may be the same as the height of the upper surface 3 a of the resin body 3. Moreover, the upper surface 5a of the resin sealing body 5 is flat and smooth. The pair of inclined surfaces 4a and 4b forming the V-shaped groove 4 is not limited to a straight line. For example, as shown in FIG. 1C, the slope 4a 'on the element side of the V-shaped groove 4' can be formed in an arc shape, and the outer slope 4b 'can be formed in a straight line. At this time, a dome-shaped resin sealing body 5 ″ is formed above the light emitting element 2. Also, as shown in FIG. 1D, a flat bottom surface 4d can be provided at the bottom of the V-shaped groove 4 ''. At this time, a truncated cone-shaped resin sealing body 5 is formed above the light emitting element 2.

  The depth and shape of the V-shaped groove 4 are not particularly limited. In this embodiment, the depth of the V-shaped groove 4 is such that the deepest bottom portion 4 c is slightly above the upper surface 1 a of the substrate 1. Therefore, a part of the peripheral side surface 2c between the periphery of the upper surface 2a and the periphery of the lower surface 2b of the light emitting element 2 is covered within the range of the slope 4a on the element side of the V-shaped groove 4. It is desirable that the depth of the V-shaped groove 4 extends to the side position of the peripheral side surface 2 c of the light emitting element 2. Further, the V-shaped angle of the V-shaped groove 4 is not particularly limited.

  In the light emitting device 10 according to this embodiment, the plurality of light emitting elements 2 are sealed by the resin sealing body 5 surrounded by the V-shaped groove 4 for each light emitting element 2. And since the peripheral side surface 5b of the resin sealing body 5 is a taper surface of a predetermined angle, the light radiate | emitted from the light emitting element 2 is easily taken out from the peripheral side surface 5b of the resin sealing body 5, and is equivalent to resin. The light extraction efficiency from the sealing body 5 can be increased.

  Further, in the light emitting device 10 according to this embodiment, since the periphery of the resin sealing body 5 is surrounded by the V-shaped groove 4, the light emitted from the light emitting element 2 has a substantially equal distance. 5 is taken out from the upper surface 5a and the peripheral side surface 5b. That is, most of the light emitted from the light emitting element 2 travels through the resin sealing body 5 by substantially the same distance and is extracted outside. As a result, the color extracted from the resin sealing body 5 does not cause uneven color.

(Second Embodiment)
FIGS. 2A and 2B show a light emitting device 20 according to a second embodiment of the present invention. The light emitting device 20 has the same configuration as the light emitting device 10 in the first embodiment except that the lens 6 is disposed on the upper surface 5a of the resin sealing body 5 that seals the light emitting element 2. Therefore, detailed description is abbreviate | omitted by using the same code | symbol in drawing.

  The lens 6 is a hemispherical convex lens having a curved upper surface 6a. The lens 6 is formed transparent with silicon resin or the like. The lens 6 is disposed on the upper surface 5 a of the resin sealing body 5 so that the top 6 b of the lens 6 is positioned immediately above the light emitting element 2. An outer peripheral portion 6 c that is a part of the lens 6 is disposed in the V-shaped groove 4. As a result, the upper part of the resin sealing body 5 and the V-shaped groove 4 surrounding the periphery thereof is covered with a hemispherical lens 6.

  Therefore, in the light emitting device 20 according to this embodiment, the same operational effects as the light emitting device 10 according to the first embodiment can be obtained, and light extracted from the upper surface 5a and the peripheral side surface 5b of the resin sealing body 5 can be obtained. There is an effect of condensing upward with a lens.

(Third embodiment)
3A and 3B show a light emitting device 30 according to a third embodiment of the present invention. The light emitting device 30 has the same configuration as that of the light emitting device 20 in the second embodiment, except that the shape of the lens 6 ′ disposed on the upper surface 5 a of the resin sealing body 5 that seals the light emitting element 2 is different. Therefore, detailed description is abbreviate | omitted by using the same code | symbol in drawing.

  The lens 6 ′ is disposed only on the upper surface 5 a of the resin sealing body 5, and is not disposed in the V-shaped groove 4 like the lens 6 in the second embodiment. The lens 6 ′ is a hemispherical convex lens having a curved upper surface 6 a ′. The lens 6 'is formed transparent with silicon resin or the like. The lens 6 ′ is disposed on the upper surface 5 a of the resin sealing body 5 so that the top 6 b ′ of the lens 6 ′ is positioned immediately above the light emitting element 2.

  Therefore, in the light emitting device 30 according to this embodiment, the same operational effects as those of the light emitting device 10 according to the first embodiment can be obtained, and the light extracted from the upper surface 5a of the resin sealing body 5 can be further extracted from the lens 6 ′. It has the effect of concentrating and condensing.

  In the first embodiment, the second embodiment, and the third embodiment described above, the case where the V-shaped groove 4 is provided in the resin body 3 that seals the plurality of light emitting elements 2 has been described. Applies even if the cross-sectional shape is other than a substantially V-shaped cross-section.

(Fourth embodiment)
4A and 4B show a light emitting device 40 according to a fourth embodiment of the present invention. Similar to the light emitting device 10 in the first embodiment, the light emitting device 40 includes a rectangular substrate 1 and a plurality of light emitting elements 2 mounted on the upper surface 1 a of the substrate 1. The plurality of light emitting elements 2 are sealed with a resin sealing body 5 ′ containing a phosphor for each light emitting element 2. Moreover, the white frame 7 is arrange | positioned between each resin sealing body 5 '. The white frame 7 is obtained by mixing a white pigment in a resin body such as a transparent silicon resin or epoxy resin. The white frame 7 has a property of reflecting light emitted from the light emitting element 2. Titanium oxide can be used as the white pigment. In addition, detailed description is abbreviate | omitted by using the same code | symbol for the same structural member as the light-emitting device 10 in 1st Embodiment.

  The resin sealing body 5 ′ includes an upper surface 5a ′ covering the upper side of the light emitting element 2, a peripheral side surface 5b ′ covering the peripheral side surface 2c of the light emitting element 2, a peripheral edge of the upper surface 5a ′, and an upper peripheral edge of the peripheral side surface 5b ′. And a tapered surface 5c for connecting the two. In this embodiment, the resin sealing body 5 ′ has a top surface 5 a ′ and a peripheral side surface 5 b ′ formed in a circular shape in plan view.

  In addition to being provided between the plurality of resin sealing bodies 5 ′, the white frame 7 may be formed so as to surround the outer periphery of the plurality of resin sealing bodies 5 ′. In this embodiment, like the resin body 3 in the first embodiment, it is formed in a circular shape in plan view so as to surround the periphery of each resin sealing body 5 ′ sealing the four light emitting elements 2. Yes. The height position of the upper surface 7a of the white frame 7 is the same as the height position of the upper end of the peripheral side surface 5b 'of the resin sealing body 5'. That is, the taper surface 5 c of the resin sealing body 5 ′ is exposed from the white frame 7.

  Accordingly, in the light emitting device 40 according to this embodiment, since the periphery of the resin sealing body 5 ′ is surrounded by the white frame 7, a part of the light emitted from the light emitting element 2 is reflected by the white frame 7. Further, since the tapered surface 5c is formed on the periphery of the upper surface 5a ′ of the resin sealing body 5 ′, the light emitted from the light emitting element 2 is transmitted to the upper surface 5a ′ and the tapered surface 5c of the resin sealing body 5 ′. The light extraction efficiency can be increased from the resin sealing body 5 ′.

  Further, in the light emitting device 40 according to this embodiment, since the periphery of the resin sealing body 5 ′ is surrounded by the white frame 7, the light emitted from the light emitting element 2 has a substantially equal distance. It is taken out from the upper surface 5a 'of 5' and the tapered surface 5c. That is, most of the light emitted from the light emitting element 2 travels through the resin sealing body 5 'by substantially the same distance and is extracted outside. As a result, no color unevenness occurs in the light extracted from the resin sealing body 5 ′.

(Fifth embodiment)
5A and 5B show a light emitting device 50 according to a fifth embodiment of the present invention. The light emitting device 50 is the same as the light emitting device 40 in the fourth embodiment except that a convex lens 6 ″ is arranged on the upper surface 5a ′ of the resin sealing body 5 ′ that seals the light emitting element 2. Consists of configuration. Therefore, detailed description is abbreviate | omitted by using the same code | symbol in drawing.

  The lens 6 ″ is a hemispherical convex lens whose upper surface 6 a ″ has a curved surface, like the lens 6 ′ in the third embodiment. The lens 6 ″ is formed transparent with silicon resin or the like. The lens 6 ″ is disposed on the upper surface 5 a ′ of the resin sealing body 5 ′ so that the top portion 6 b ″ of the lens 6 ″ is positioned immediately above the light emitting element 2.

  Therefore, in the light emitting device 50 according to this embodiment, the same effect as the light emitting device 40 according to the fourth embodiment can be obtained, and the light extracted from the upper surface 5a ′ of the resin sealing body 5 ′ can be further lensed. There is an effect of concentrating and condensing with 6 ″.

DESCRIPTION OF SYMBOLS 1 Substrate 1a Upper surface of substrate 2 Light emitting element 2a Upper surface of light emitting element 2b Lower surface of light emitting element 2c Peripheral side surface of light emitting element 3 Resin body 3a Upper surface of resin body 4, 4 ', 4''Concave groove (V-shaped groove)
4a Element-side slope 4b Outside slope 4c V-groove bottom 4d V-groove bottom 5,5 ', 5''Resin sealing body 5a, 5a' Resin sealing body top surface 5b, 5b 'Resin sealing Body peripheral surface 5c Tapered surface 6, 6 ', 6 "Lens 6a, 6a', 6a" Lens upper surface 6b, 6b ', 6b "Lens top 6c Lens outer periphery 7 White frame 7a White frame Upper surface 10, 20, 30, 40, 50 Light emitting device

Claims (7)

In a light-emitting device comprising a substrate, a plurality of light-emitting elements mounted on the substrate, and a resin sealing body containing a phosphor that seals the plurality of light-emitting elements,
A plurality of the resin sealing bodies are provided for each light emitting element, and each resin sealing body has an upper surface centered on the light emitting element and a tapered surface provided on the periphery of the upper surface.   A resin body containing a phosphor that integrally seals a plurality of light emitting elements is provided, and the resin body is formed with a concave groove surrounding the periphery of each light emitting element in a circular shape, and each of the above-described inner areas surrounded by the concave grooves A light emitting device having a resin sealing body.   The light emitting device according to claim 2, wherein the concave groove has a substantially V-shaped cross section, and each of the resin sealing bodies is formed in a truncated cone shape or a dome shape.   4. The light emitting device according to claim 2, wherein a depth of the concave groove extends to a lateral position of a peripheral side surface of the light emitting element.   The light-emitting device according to claim 1, comprising a plurality of resin sealing bodies and a resin body containing a white pigment filled between the resin sealing bodies.   The light emitting device according to claim 1, wherein a lens is disposed on an upper surface of the plurality of resin sealing bodies.   The light emitting device according to any one of claims 2 to 4, wherein lenses are disposed on upper surfaces of the plurality of resin sealing bodies and the concave grooves.

Images