JP2018061068A - Light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a larger rectangular region in a light emission surface in a light emitting device using an area enclosed by a frame body as the light emission surface.SOLUTION: A light emitting device 1 includes: a substrate 10; light emitting elements 20 disposed on the substrate 10; a frame body 30 which is arranged so as to enclose the light emitting elements 20; and a translucent member 40 for sealing an area enclosed by the frame body 30. An inner periphery of the frame body 30 has: at least a pair of two sides 32a, 32b facing each other; and four acute angle parts 50 disposed at both ends of these two sides 32a, 32b in a plan view.SELECTED DRAWING: Figure 1A

Description

  The present disclosure relates to a light emitting device.

  A light emitting diode module having a substrate, a plurality of light emitting diode chips mounted on the substrate, a dam member surrounding the plurality of light emitting diode chips, and a fluorescent layer disposed in a region surrounded by the dam member is known. (See Patent Document 1). The weir member is formed by applying and curing a resin member on the substrate. A region surrounded by the weir member is a light emitting surface of the light emitting diode module, and has a rectangular shape in plan view.

JP 2013-118284 A

  However, the resin member before curing has fluidity. Therefore, according to the above conventional light emitting diode module, the inner corner of the region surrounded by the weir member is supposed to have a right angle, and the area of the light emitting region is reduced by the amount of R.

  The above problem can be solved by, for example, the following means.

  A substrate, a light emitting element disposed on the substrate, a frame disposed so as to surround the light emitting element, and a translucent member that seals a region surrounded by the frame. The inner periphery of the body is a light emitting device having at least one pair of two opposing sides and four acute angle portions respectively disposed at both ends of the two sides in plan view.

  According to the above light-emitting device, in the light-emitting device that uses the region surrounded by the frame as the light-emitting surface, a larger rectangular region can be provided in the light-emitting surface.

1 is a schematic plan view of a light emitting device according to Embodiment 1. FIG. It is a figure which expands and shows the part enclosed with the dotted line in FIG. 1A. 1 is a schematic front view of a light emitting device according to Embodiment 1. FIG. 1 is a schematic side view of a light emitting device according to Embodiment 1. FIG. It is a figure which shows IE-IE cross section in FIG. 1A. FIG. 3 is a schematic plan view illustrating the shape of the inner periphery of the frame body in the light emitting device according to Embodiment 1. It is a figure which expands and shows the part enclosed with the dotted line in FIG. 1F. FIG. 6 is a schematic plan view illustrating the shape of the inner periphery of a frame body in a light emitting device according to Embodiment 2. It is a figure which expands and shows the part enclosed with the dotted line in FIG. 2A. FIG. 6 is a schematic plan view illustrating the shape of the inner periphery of a frame body in a light emitting device according to Embodiment 3. It is a figure which expands and shows the part enclosed with the dotted line in FIG. 3A. FIG. 6 is a schematic plan view illustrating the shape of the inner periphery of a frame body in a light emitting device according to Embodiment 4. It is a figure which expands and shows the part enclosed with the dotted line in FIG. 4A. FIG. 10 is a schematic plan view illustrating the shape of the inner periphery of a frame body in a light emitting device according to Embodiment 5. It is a figure which expands and shows the part enclosed with the dotted line in FIG. 5A. FIG. 10 is a schematic plan view illustrating the shape of the inner periphery of a frame body in a light emitting device according to Embodiment 6. It is a figure which expands and shows the part enclosed with the dotted line in FIG. 6A. FIG. 10 is a schematic plan view illustrating the shape of the inner periphery of a frame body in a light emitting device according to Embodiment 7. It is a figure which expands and shows the part enclosed with the dotted line in FIG. 7A.

[Light Emitting Device 1 According to Embodiment 1]
1A is a schematic plan view of the light emitting device according to Embodiment 1, and FIG. 1B is an enlarged view of a portion surrounded by a dotted line in FIG. 1A. 1C is a schematic front view of the light-emitting device according to Embodiment 1, and FIG. 1D is a schematic side view of the light-emitting device according to Embodiment 1. FIG. FIG. 1E is a cross-sectional view taken along the line IE-IE in FIG. 1A. FIG. 1F is a schematic plan view for explaining the shape of the inner periphery of the frame body in the light emitting device according to Embodiment 1, and FIG. 1G is an enlarged view of a portion surrounded by a dotted line in FIG. 1F. In FIG. 1A, the light-emitting element 20 and the translucent member 40 that seals the light-emitting element 20 are shown in a superimposed manner with a solid line in consideration of visibility. In FIG. 1F and FIG. 1G, illustration of the round R formed at the tip of the acute angle portion 50 is omitted for easy understanding.

  As shown in FIGS. 1A to 1G, the light-emitting device 1 according to Embodiment 1 includes a substrate 10, a light-emitting element 20 disposed on the substrate 10, a frame body 30 disposed so as to surround the light-emitting element 20, A translucent member 40 that seals a region surrounded by the frame 30. As shown in FIG. 1F, the inner periphery P of the frame 30 has at least one pair of opposing two sides 32a and 32b and four acute angle portions 50 respectively disposed at both ends of the two sides in a plan view. Have Details will be described below.

(Substrate 10)
The substrate 10 is configured using an insulating material such as glass epoxy resin, polyimide resin, ceramics, or glass. When using ceramics, it is preferable to use alumina, aluminum nitride, mullite, silicon carbide, silicon nitride, or the like in order to increase the heat resistance of the substrate 10. The shape of the substrate 10 is, for example, a plate shape.

  Conductor wiring can be arranged on the substrate 10. The light emitting element 20 is placed on the conductor wiring disposed on the surface of the substrate 10. Various sizes and shapes of conductor wirings can be selected. Examples of the material for the conductor wiring include metals such as copper, aluminum, gold, silver, tin, platinum, titanium, tungsten, palladium, iron, nickel, and alloys containing these metals. When gold bumps are used for mounting the light emitting element 20, the bonding property between the bumps and the conductor wiring is improved by using gold on the outermost surface of the conductor wiring.

(Light emitting element 20)
The light emitting element 20 is disposed on the substrate 10. Specifically, the light emitting element 20 is disposed on a conductor wiring disposed on the substrate 10. A light emitting diode is preferably used for the light emitting element 20. As the light emitting element 20, a light emitting element having an emission wavelength in an arbitrary region between the ultraviolet region and the infrared region can be appropriately selected according to the purpose. Various semiconductors such as nitride semiconductors (eg, InN, AlN, GaN, InGaN, AlGaN, InGaAlN), III-V group compound semiconductors, II-VI group compound semiconductors on a growth substrate such as a sapphire substrate or a GaN substrate A layered structure including a light emitting layer formed by the above can be used as the light emitting element 20.

  The light emitting element 20 may include, for example, a p-side electrode and an n-side electrode on the same surface side, or may be provided to face each other. The connection method of the light emitting element 20 and the conductor wiring on the board | substrate 10 can be performed by a wire bonding or a flip chip system, for example. In the case of the flip chip method, for example, gold bumps can be used. The number of light emitting elements 20 arranged in the light emitting device 1 may be one or plural. In the case where a plurality of light emitting elements 20 are provided, it is preferable that the plurality of light emitting elements 20 are arranged in an array such as a matrix or a staggered arrangement in order to suppress uneven light emission.

(Frame 30)
The frame 30 is configured using a resin member. For the resin member, a thermosetting resin, a thermoplastic resin, or the like can be used. More specifically, a silicone resin, a modified silicone resin, an epoxy resin, a modified epoxy resin, an acrylic resin, a hybrid resin including at least one of these resins, or the like can be used as the material of the frame body 30. These resin members preferably contain a light reflecting member that reflects the light of the light emitting element 20. Examples of the light reflecting member include TiO ₂ , Al ₂ O ₃ , ZrO ₂ , MgO, and BN.

  Black circles in FIGS. 1F and 1G are attached to facilitate understanding of the two sides 52 and 54 constituting the acute angle portion 50, and do not constitute the shape of the inner periphery P of the frame 30. In addition, the black circle is given for the sake of convenience. In the present embodiment, there is a clear boundary between the two sides 52 and 54 constituting the acute angle portion 50 and the sides 32a, 32b, 34a and 34b. not exist. In addition, the rectangular area X mentioned later means the rectangular area shown with a dotted line in FIG. 1F.

  As shown in FIGS. 1F and 1G, the inner periphery P of the frame 30 has at least one pair of opposing two sides 32a and 32b and four acute angle portions respectively disposed at both ends of the two sides in plan view. 50. That is, the four acute angle portions 50 are respectively arranged outside the four corners of the rectangular region X that is in contact with the pair of opposing two sides 32a and 32b. In this way, the area of the rectangular region X in contact with the pair of opposing two sides 32 a and 32 b can be made closer to the area of the entire region surrounded by the frame body 30. Therefore, in the light emitting device 1 that uses the region surrounded by the frame 30 as the light emitting surface, a larger rectangular region X can be provided in the light emitting surface. The reason is as follows.

  That is, the frame 30 is formed by, for example, continuously discharging an uncured resin material from the tip of the needle of the resin discharge device and curing the discharged resin material. The discharged uncured resin material spreads wet. When a rectangular frame is formed on a flat surface using a resin material, the traveling direction of the needle is changed from one direction to a direction perpendicular thereto at the rectangular corner. In the rectangular corner, the spread of the resin material arranged along one direction and the spread of the resin material arranged along the direction perpendicular thereto are concentrated. Thereby, the inner peripheral corner portion of the frame body tends to have a rounded shape, that is, a so-called round shape. In other words, the inner angle of the region surrounded by the frame body 30 tends to have a round shape.

  Therefore, in the present embodiment, the inner periphery P of the frame 30 is provided with four acute angle portions 50 on the outer sides of the four corners of the rectangular region X in contact with the pair of opposing two sides 32a and 32b. For this purpose, the needle is not changed direction at right angles along the outer edges of the four corners of the rectangular area X, but is moved outside the outer edges of the rectangular area X just before reaching the four corners of the rectangular area X. Turn around outside the four corners. Thereby, the spread of the resin material at the corner portion of the inner periphery P of the frame body 30 is concentrated inside the acute angle portion 50 arranged outside the four corners of the rectangular region X. Therefore, the spread of the resin material at the corner portion of the inner periphery P of the frame body 30 is difficult to reach the inside of the rectangular region X in contact with the pair of opposing two sides 32a and 32b. For this reason, the area of the rectangular region X in contact with the pair of opposing two sides 32 a and 32 b can be made close to the area of the entire region surrounded by the frame body 30. That is, “the area of the rectangular region X in contact with the pair of opposing two sides 32a and 32b / the area of the entire region surrounded by the frame 30” can be made close to 1. Therefore, in the light emitting device 1 that uses the region surrounded by the frame 30 as the light emitting surface, a larger rectangular region X can be provided in the light emitting surface.

  Since the acute angle portion 50 is outside the rectangular region X, whether or not the radius R is formed at the tip of the acute angle portion 50 (in other words, between the two sides 52 and 54; the same applies hereinafter) Does not affect area. However, it is preferable that a radius R is formed at the tip of the acute angle portion 50 as in the present embodiment. In this way, the contact area between the frame 30 made of a resin material and the substrate 10 on which the frame 30 is arranged increases, so that the adhesion between the frame 30 and the substrate 10 is improved.

  The acute angle portion 50 is a part of a region surrounded by the frame body 30. Two sides 52 and 54 constituting the acute angle portion 50 are a part of the inner periphery P of the frame 30. The internal angle d formed by the two sides 52 and 54 constituting the acute angle portion 50 is an acute angle. In other words, in the region surrounded by the frame 30, a portion where the inner angle d formed by the two sides 52 and 54 is an acute angle is referred to as an acute angle portion 50 in the present embodiment.

  Each of the two sides 52 and 54 constituting the acute angle portion 50 may be a straight line, a curved line, or a combination thereof. When the two sides 52 and 54 constituting the acute angle portion 50 are both straight lines, the angle formed by the two straight lines is the inner angle d in the acute angle portion 50. When the two sides 52 and 54 constituting the acute angle portion 50 are one straight line and one curve, the angle formed by one straight line and a tangent at an arbitrary point on one curve is the acute angle portion. The inner angle d is 50. Further, when the two sides constituting the acute angle portion 50 are both curved, the angle formed by the tangents at arbitrary points on the two curves is the inner angle d of the acute angle portion 50. When one or both of the two sides 52 and 54 constituting the acute angle portion 50 is a curve, the value of the inner angle d varies depending on the position where the tangent is drawn on the curve, but no matter where the tangent is drawn, The inner angle d formed by the tangent line is preferably an acute angle. Thereby, in the area surrounded by the frame body 30, the area of the area other than the rectangular area X in contact with the pair of opposing two sides 32a and 32b can be reduced.

  The light emitting device 1 according to this embodiment includes two sets of two opposing sides 32a and 32b and 34a and 34b. Two sets of two opposing sides are curves that are convex toward the inside of the frame 30. In the present embodiment, the two sides 52 and 54 constituting the acute angle portion 50 are also curves that are convex with respect to the inside of the frame body 30.

  Of the two sides 52 and 54 constituting the acute angle portion 50, the side 52 is located on the extension line of the side 32a of the pair of two opposite sides 32a and 32b, and the side 54 is another pair of two sides opposite to each other. It is located on the extension line of the side 34a among 34a, 34b. In this way, the rectangular region X that is in contact with one set of the two opposite sides 32a and 32b is also in contact with the other set of two opposite sides 34a and 34b (that is, the rectangular region X has two sides 32a, In order to make contact with not only 32b but also the two sides 34a and 34b), the area of the rectangular region X can be made larger in the region surrounded by the frame 30.

  It is preferable that the outer periphery Q of the frame 30 has four substantially arc-shaped outer peripheral corners 60 in plan view. The four substantially arcuate outer peripheral corners 60 are arranged corresponding to the acute corners 50 on the inner periphery P of the frame 30. That is, in the present embodiment, the shape of the corner portion of the frame body 30 on the inner periphery P side is the acute angle portion 50, and the shape of the outer periphery Q side is the outer periphery corner portion 60. Usually, in a frame having a rectangular shape in plan view, stress concentrates on the corners of the rectangle. For this reason, peeling of the frame 30 from the substrate 10 tends to occur from the corners of the frame 30. However, if the four outer peripheral corners 60 of the frame 30 are formed in a substantially arc shape, the stress at the corners is relieved. Therefore, the adhesion between the frame 30 and the substrate 10 can be improved.

  Height from the surface of the substrate 10 to the upper end of the frame body 30 (when the frame body 30 is disposed on the surface of the substrate 10 via another member, from the surface of the other member to the upper end of the frame body 30 Basically, the height is preferably uniform. The region surrounded by the frame body 30 is filled with the translucent member 40, but if the height of the upper end of the frame body 30 is uneven, a part of the translucent member 40 leaks from the frame body 30. This is because the shape of the light emitting surface (the upper surface of the translucent member 40) may not be stable due to scooping up the frame 30.

  However, the outer peripheral corner portion 60 of the frame body 30 may be formed higher than other portions of the frame body 30. In this way, it is possible to prevent the light emitting surface from being damaged or soiled when the light emitting device 1 is turned over or stacked. Moreover, when packing the light-emitting device 1, it can suppress that a light emission surface contacts a packing material. In addition, when the internal angle d in the acute angle part 50 is small, when the acute angle part 50 is formed, the locus | trajectory of a needle may overlap partially. Since the resin member discharged from the needle overlaps at the portion where the trajectory of the needle overlaps, the outer peripheral corner portion 60 of the frame 30 can be formed higher than the other portion of the frame 30.

(Translucent member 40)
The translucent member 40 is a member that seals a region surrounded by the frame body 30 in order to protect the light emitting element 20 from dust, moisture, and external force. The translucent member 40 is a member that transmits light from the light emitting element 20.

As the light transmissive member 40, a member having light resistance to the light of the light emitting element 20 is preferably used. Specifically, a silicone resin, an epoxy resin, a urea resin, or the like is preferably used. The translucent member 40 can contain a filler such as a phosphor or a light diffusing material depending on the purpose. The phosphor, for _example, YAG: yellow phosphor _{(Y 3 Al 5 O 12 Ce} ) or silicates and the like, or, CASN (CaAlSiN _3: Eu) and _{KSF (K 2 SiF 6: Mn} ) red phosphor such as Can be mentioned. As the light diffusing material, for example, a material having high light reflectance such as SiO ₂ , TiO ₂ , Al ₂ O ₃ , ZrO ₂ , MgO can be suitably used. For the purpose of cutting undesired wavelengths, for example, organic or inorganic coloring dyes or coloring pigments can be used as fillers.

  As described above, according to the present embodiment, the area of the rectangular region X in contact with the pair of opposing two sides 32a and 32b can be made close to the area of the entire region surrounded by the frame body 30. That is, “the area of the rectangular region X actually formed / the area of the entire region surrounded by the frame 30” can be made close to 1. Therefore, in the light emitting device 1 that uses the region surrounded by the frame 30 as the light emitting surface, a larger rectangular region X can be provided in the light emitting surface.

  Hereinafter, another example of the shape of the inner periphery P of the frame 30 will be described with reference to FIGS. 2A to 7B. 2A, FIG. 3A, FIG. 4A, FIG. 5A, FIG. 6A, and FIG. 7A, a rectangular area indicated by a dotted line indicates a rectangular area X as in FIG. 1F.

[Another example of the shape of the inner periphery P of the frame 30: Embodiment 2]
FIG. 2A is a schematic plan view for explaining the shape of the inner periphery of the frame body in the second embodiment, and FIG. 2B is an enlarged view of a portion surrounded by a dotted line in FIG. 2A. The second embodiment is different from the example described in the first embodiment in that a pair of opposing two sides 32a and 32b have straight portions. According to the second embodiment, the area of the rectangular region X is obtained by overlapping the linear portion of the pair of opposing two sides 32a and 32b with the outer edge of the rectangular region X in contact with the pair of opposing two sides 32a and 32b. Can be made closer to the area of the entire region surrounded by the frame 30.

[Another example of the shape of the inner periphery P of the frame 30: Embodiment 3]
FIG. 3A is a schematic plan view for explaining the shape of the inner periphery of the frame body in the third embodiment, and FIG. 3B is an enlarged view of a portion surrounded by a dotted line in FIG. 3A. The third embodiment is different from the first embodiment in that each of two sets of two opposite sides 32a, 32b, 34a, and 34b has a straight line portion. According to the third embodiment, the linear portions of the two opposing two sides 32a, 32b, 34a, and 34b overlap the outer edge of the rectangular region X that is in contact with the two opposing two sides 32a, 32b, 34a, and 34b. Thus, the area of the rectangular region X can be made closer to the area of the entire region surrounded by the frame body 30.

[Another example of the shape of the inner periphery P of the frame 30: Embodiment 4]
FIG. 4A is a schematic plan view for explaining the shape of the inner periphery of the frame body in the fourth embodiment, and FIG. 4B is an enlarged view of a portion surrounded by a dotted line in FIG. 4A. The fourth embodiment is different from the first embodiment in that the two opposing two sides 32a, 32b, 34a, and 34b have straight portions, and the two sides 52 and 54 constituting the acute angle portion 50 are both straight. To do. Also in the fourth embodiment, similarly to the third embodiment, the linear portions of the two opposing two sides 32a, 32b, 34a, and 34b are rectangles that contact the two opposing two sides 32a, 32b, 34a, and 34b. By overlapping with the outer edge of the region X, the area of the rectangular region X can be made closer to the area of the entire region surrounded by the frame body 30.

[Another example of the shape of the inner periphery P of the frame 30: Embodiments 5 and 6]
FIG. 5A is a schematic plan view for explaining another example of the shape of the inner periphery of the frame body in the fifth embodiment, and FIG. 5B is an enlarged view of a portion surrounded by a dotted line in FIG. 5A. 6A is a schematic plan view for explaining the shape of the inner periphery of the frame body in the sixth embodiment, and FIG. 6B is an enlarged view showing a portion surrounded by a dotted line in FIG. 6A. In the fifth and sixth embodiments, two sets of two opposite sides 32a, 32b, 34a, and 34b have straight portions, and one side 52 of the two sides 52 and 54 constituting the acute angle portion 50 is a straight line, and the other This is different from the first embodiment in that the side 54 is a curve. According to the fifth and sixth embodiments, the area of the rectangular region X in contact with the two opposing two sides 32a, 32b, 34a, 34b can be made closer to the area of the entire region surrounded by the frame body 30. it can. Further, one side 52 (side 54 in the sixth embodiment) of the two sides constituting the acute angle portion 50 is one of a pair of opposing two sides 32a and 32b (side 34a and side 34b in the sixth embodiment). Part. If it does in this way, the number of times of direction change of the needle at the time of forming frame 30 can be decreased.

[Another example of the shape of the inner periphery P of the frame 30: Embodiment 7]
FIG. 7A is a schematic plan view for explaining the shape of the inner periphery of the frame body in the seventh embodiment, and FIG. 7B is an enlarged view showing a portion surrounded by a dotted line in FIG. 7A. The seventh embodiment is different from the first embodiment in that a pair of opposing two sides 32a and 32b has a straight portion, and two sides 52 and 54 constituting the acute angle portion 50 are both straight. Also in the seventh embodiment, the area of the rectangular region X in contact with the pair of opposing two sides 32 a and 32 b can be made closer to the area of the entire region surrounded by the frame body 30.

  Although the embodiments have been described above, these descriptions do not limit the configurations described in the claims.

  The surface light source device using the light emitting device according to the present embodiment is, for example, a projector light source such as a head-up display, an in-vehicle illumination such as a headlight, an illumination light source, a liquid crystal display used for a television receiver or a personal computer. It can be used for backlight units, small liquid crystal displays and mobile phones.

DESCRIPTION OF SYMBOLS 1 Light-emitting device 10 Substrate 20 Light-emitting element 30 Frame body 40 Translucent members 32a and 32b One set of two sides 34a and 34b One set of two sides 50 Acute angle portions 52 and 54 Two sides 60 constituting an acute angle portion Peripheral corner portion P Inner periphery Q of frame body Outer periphery R of frame body R X Rectangular region

Claims (11)

A substrate,
A light emitting device disposed on the substrate;
And a frame body disposed so as to surround the light emitting element,
Inner periphery of the frame body, in a plan view, possess at least one pair of opposing two sides, and four sharp corners, which are respectively arranged at each end of these two sides, and
The frame body has a rectangular area in an area surrounded by the frame body in plan view, at least a part of each of the four sides constituting the rectangular area is in contact with the inner periphery of the frame body, and The four corners constituting the rectangular area are light emitting devices that are separated from the inner periphery of the frame . The frame body has four outer peripheral corner portions arranged corresponding to the four acute angle portions in plan view,
The light emitting device according to claim 1, wherein the outer peripheral corner portion is formed to have a height higher than the other portion of the frame body. At least one light emitting device according to claim 1 or 2 is a curve of the two sides constituting the acute angle portion. The light emitting device according to claim 1 or 2 two sides constituting the acute angle portion are both curved. The light emitting device according to any one of 4 claims 1 tip of the acute angle portion having a radius.   The light-emitting device according to claim 1, wherein each of the two opposing sides of the set includes a straight portion. The inner periphery of the frame has two sets of two opposing sides,
The two sets of two opposing sides each have a straight portion,
The light-emitting device according to claim 1.   The light emitting device according to claim 1, wherein the frame body includes a light reflecting member.   The light emitting device according to claim 1, comprising a plurality of the light emitting elements. The light-emitting device according to claim 1, further comprising a translucent member that seals a region surrounded by the frame. The light-emitting device according to claim 10 , wherein the translucent member contains a phosphor.

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