JP2013243237A - Light emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting device which facilitates the control of the shape and the thickness of a translucent resin and improves the light extraction efficiency.SOLUTION: A light emitting device 100 includes: a mounting surface 51 on which a light emitting element 10 is mounted; a coating base part 76 which includes a coating base part rear surface 762 formed into an annular shape so as to enclose a periphery of the light emitting element 10 and contacting with the mounting surface 51, a coating base part front surface 761, and a coating base part outer peripheral surface 763; and coating protrusion part 75 including a coating protrusion rear surface 752 formed into an annular shape so as to protrude from the coating base part front surface 761 and contacting with the coating base part front surface 761, a coating protrusion front surface 751, and a coating protrusion outer peripheral surface 753. The coating protrusion outer peripheral surface 753 is positioned at the inner side relative to the coating base part outer peripheral surface 763.

Description

  The present invention relates to a light emitting device having a light emitting element mounted on a substrate and a method for manufacturing the same.

  In recent years, replacement of conventional illumination such as incandescent bulbs and fluorescent lamps with LED (light emitting diode) illumination, which has lower power consumption and longer life than conventional illumination, is progressing. Most of the illumination is white and white LEDs are used.

  There are two ways to obtain white with an LED. The first method is a method of synthesizing the light emission of elements using a plurality of light emitting elements such as red, blue, and green. The second method is a method of synthesizing the light emission of the element and the converted light of the phosphor using a single color light emitting element and the phosphor. In order to reduce costs, many white LEDs employ the latter method (see Patent Documents 1 to 3).

  A light emitting device using a phosphor obtains light of a desired color by covering the light emitting element with a resin containing the phosphor. However, there has been a problem that a desired color cannot be obtained due to a change in the shape and thickness of the resin due to manufacturing variations.

JP 2007-201171 A JP 2010-003994 A JP 2012-015318 A

  In Patent Document 1, the shape and thickness of the resin are stabilized by surrounding the light emitting element with a highly reflective resin formed in a concave shape, in order to solve the problem of uneven color due to variations in the shape and thickness of the resin. However, the concave highly reflective resin needs to be set at least higher than the light emitting element. In addition, considering the variation in the amount of resin, it is necessary to make the concave highly reflective resin higher than the light emitting element. Therefore, there is a problem that light hitting the highly reflective resin increases, reflection loss increases, and light extraction efficiency decreases.

  In Patent Document 2, in response to the problem of color unevenness due to variations in the shape and thickness of the resin and the problem of reduced light extraction efficiency due to the reflection loss, the edge is provided by providing a substantially vertical edge on the outer periphery of the damming portion. Compared to the case where there is no dam, the damming part is lowered. Therefore, the light extraction efficiency is improved while stabilizing the shape and thickness of the resin.

  However, if the edge formation is insufficient, the edge is missing, the dust is attached to the edge, or the resin is excessively supplied due to variations, the resin flows out from the damming part, causing the shape to collapse and the shape and thickness of the resin to be stable. There was a problem of not doing.

  Increasing the contact angle of the resin at the edge and making the resin shape closer to a hemisphere improves the light extraction efficiency. However, in Patent Document 2, in order to make the resin shape closer to a hemisphere, the amount of resin is increased and the contact angle is increased. It is necessary to increase the limit so that it does not flow out of the edge. However, when the amount of resin varies, there is a problem that the resin easily flows out from the damming portion and the shape and thickness of the resin change. Further, in order to prevent this problem, it is necessary to reduce the amount of resin and reduce the contact angle. Thus, there is a problem that the resin shape cannot be made close to a hemispherical shape and the light extraction efficiency is lowered.

  In Patent Document 3, the variation in the amount of resin is within the range that runs on the damming portion, and the shape and thickness of the resin is reduced by allowing the resin to spread to the edge of the damming portion by forming the damming portion with an oil repellent material. Stabilized.

  However, in order to keep the variation in the resin amount within the range on the oil-repellent pattern, an apparatus capable of finely managing the resin amount as compared with the conventional technique is required, resulting in a high cost. Moreover, since the oil repellent component is contained, there is a problem that the reflectance is lowered and the light extraction efficiency is lowered. In addition, the oil repellent pattern has a problem that the contact angle is small and the light extraction efficiency is low.

  An object of the present invention is to facilitate control of the shape and thickness of a resin and to improve light extraction efficiency.

  The light emitting device according to the present invention is a light emitting device having a light emitting surface on which a light emitting element is mounted, and is a first film formed in an annular shape so as to surround the periphery of the light emitting element. A first coating back surface that is in contact with the first coating coating surface, the first coating coating surface facing the first coating coating back surface, and a first coating formed from an outer peripheral edge of the first coating surface to an outer peripheral edge of the first coating back surface. A first film having an outer peripheral surface, and a second film formed in an annular shape so as to protrude from the surface of the first film, the second film back surface being in contact with the surface of the first film; A second coating surface opposite to the second coating back surface, and a second outer peripheral surface formed from the outer peripheral edge of the second coating surface to the outer peripheral edge of the second coating back surface. And the second outer peripheral surface is on the inner side than the first outer peripheral surface. And it is located.

  The light emitting device according to the present invention is a light emitting device having a light emitting surface on which a light emitting element is mounted, and is a first film formed in an annular shape so as to surround the periphery of the light emitting element. A first coating back surface that is in contact with the first coating coating surface, the first coating coating surface facing the first coating coating back surface, and a first coating formed from an outer peripheral edge of the first coating surface to an outer peripheral edge of the first coating back surface. A first film having an outer peripheral surface, and a second film formed in an annular shape so as to protrude from the surface of the first film, the second film back surface being in contact with the surface of the first film; A second coating surface opposite to the second coating back surface, and a second outer peripheral surface formed from the outer peripheral edge of the second coating surface to the outer peripheral edge of the second coating back surface. And the second outer peripheral surface is on the inner side than the first outer peripheral surface. Because it is located, even if the translucent material flows out from the outer peripheral edge of the second coating surface, it can be blocked by the outer peripheral edge of the first coating surface, so that the shape and thickness of the translucent material are stabilized. Thus, a light-emitting device with little color unevenness can be obtained.

1 is a cross-sectional view of a light emitting device 100 according to Embodiment 1. FIG. 2 is a plan view of the light emitting device 100 according to Embodiment 1 as viewed from above. FIG. It is sectional drawing of the light-emitting device 101 for demonstrating the relationship between the contact angle of light, and extraction efficiency. 2 is a cross-sectional view of the light emitting device 100 in which the surface of the substrate 50 of Embodiment 1 is covered with a highly reflective film. FIG. FIG. 3 is an enlarged view of a cross section around a film 70 according to the first embodiment. FIG. 3 is an enlarged view of a cross section around a coating film 70 when the translucent material 80 of Embodiment 1 flows out. It is an enlarged view of the section of the circumference of coat 70 when the 1st damming part and the 2nd damming part are arranged. FIG. 6 is a view showing variations in cross-sectional shape of the coating 70 of the first embodiment. FIG. 6 is an enlarged view of a cross section around a film 70 according to a second embodiment. It is the figure which showed balance of force when a droplet is dripped at the solid surface. It is the figure which showed balance of force when a droplet is dripped at the solid surface which has an edge part. It is the figure which showed the shape of the translucent material 80 when the angle of edge (alpha) 77 changes in Embodiment 2, and the shape of the translucent material 80 when the translucent material 80 increases. It is the figure which showed the variation of the cross-sectional shape of the film 70 of Embodiment 2. FIG. FIG. 6 is a plan view of the light emitting device 103 according to Embodiment 3 as viewed from above. 6 is a cross-sectional view of a light emitting device 103 according to Embodiment 3. FIG. It is an enlarged view of the cross section of the coating 70A and the coating 70B periphery of Embodiment 3. FIG. FIG. 10 is an enlarged view of a cross section around a coating film 70 of a fourth embodiment. FIG. 10 is an enlarged view of a cross section around coatings 70A and 70B of a fifth embodiment. FIG. 10 is an enlarged view of a cross section around a film 70 according to a sixth embodiment. FIG. 20 is an enlarged view of a cross section around coatings 70A and 70B according to a seventh embodiment. FIG. 10 is an explanatory diagram 1 of an etching method according to an eighth embodiment. FIG. 2 is an explanatory diagram 2 of an etching method according to an eighth embodiment. It is the top view which looked at the light-emitting device 110 of Embodiment 10 from the top. (A) is an enlarged view of a cross section passing through the coating base outer peripheral portion 76oL of the tenth embodiment, and (b) is an enlarged view of a cross section passing through the coating base outer peripheral portion 76oH of the tenth embodiment. It is the top view which looked at an example of the light-emitting device 110 of Embodiment 10 from the top. FIG. 40 is a schematic diagram of translucent material 80 as seen from above when translucent material 80 flows out from edge α77 in the tenth embodiment. It is the top view which looked at the light-emitting device 111 of Embodiment 11 from the top. It is the top view which looked at the light-emitting device 112 of Embodiment 12 from the top.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the description of each embodiment, the directions such as “up”, “down”, “left”, “right”, “front”, “back”, “front”, “back” are However, it is not intended to limit the arrangement or orientation of devices, instruments, parts, or the like.

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

  FIG. 1 is a cross-sectional view of the light emitting device 100 of the present embodiment. The light emitting device 100 includes a light emitting element 10, a wire 20, a bonding agent 30, a bump 40, a substrate 50, a circuit pattern 60, a film 70, and a translucent material 80 including a phosphor material. The light emitting element 10 is, for example, an LED (light emitting diode) element, and is mounted on the mounting surface 51 of the substrate 50. Bumps 40 are embedded in the substrate 50. The bump 40 is a material having high thermal conductivity such as copper or aluminum, and is intended for heat dissipation of the light emitting element 10. Examples of the translucent material 80 (also referred to as translucent resin) include organic compounds such as silicone resin and epoxy resin, and inorganic compounds such as low-melting glass.

  FIG. 2 is a plan view of the light emitting device 100 according to the present embodiment as viewed from above. The light emitting element 10 is bonded to the bumps 40 via a bonding agent 30 such as resin, silver paste, or solder. The substrate 50 includes a circuit pattern 60, and the light emitting element 10 is electrically connected to the circuit pattern 60 through the wire 20. The position and shape of the circuit pattern 60 are not specified, and the circuit pattern 60 is not limited to FIG.

  In FIG. 2, the translucent material 80 is omitted. The coating 70 is formed in an annular shape (ring shape) so as to surround the light emitting element 10. The translucent material 80 is formed in a substantially hemispherical shape inside the annular coating 70.

  As shown in FIG. 1, the cross-sectional shape on the outer peripheral side of the coating 70 is stepped. Details of the shape and cross-sectional shape of the coating 70 will be described later.

  FIG. 3 is a cross-sectional view of the light emitting device 101 for explaining the relationship between the contact angle of light and the extraction efficiency. In the light emitting device 101, the light extraction efficiency is improved as the contact angle of the resin covering the light emitting element 10 is increased and the resin shape is made closer to a hemispherical shape. The reason why the light extraction efficiency increases as the contact angle of the resin is increased and the resin shape is made closer to a hemispherical shape will be described with reference to FIG.

  3, components having the same functions as those in FIG. 1 are denoted by the same reference numerals. The light emitting device 101 includes a damming portion 201 for damming the translucent material 80A or the translucent material 80B instead of the coating 70 in FIG. A translucent material 80A having a large contact angle with the damming portion 201 and a translucent material 80B having a small contact angle are shown. The angle formed between the path 11 of light emitted from the light emitting element 10 and the interface of the light transmissive material 80A is defined as angle A, and the angle formed between the path 11 of light emitted from the light emitting element 10 and the interface of the light transmissive material 80B. An angle B is assumed.

  The angle A is smaller than the angle B as shown in FIG. The translucent material 80A having a larger contact angle and a resin shape closer to a hemispherical shape has a smaller incident angle (angle A), less reflected light at the interface, and more light (11A) to be extracted. The extraction efficiency is high. On the other hand, the translucent material 80B having a smaller contact angle has a larger incident angle (angle B), and the reflected light (11B) at the interface increases, so that the light extraction efficiency is lowered. As described above, as the contact angle is increased and the resin shape is made closer to a hemispherical shape, the incident angle of light becomes smaller, reflection at the interface of the translucent resin is reduced, and light extraction efficiency is improved.

  FIG. 4 is a cross-sectional view of the light emitting device 100 in which the surface of the substrate 50 according to the present embodiment is covered with a highly reflective film. In FIG. 4, the mounting surface 51 of the substrate 50 is covered with a coating 71 made of a highly reflective material, and the path of light emitted from the light emitting element 10 at that time is indicated by arrows.

  The light path emitted from the light emitting element 10 is reflected by the light path 14 that passes through the translucent material 80 and directly reaches the outside, and the inner slope 701 that is the inner peripheral surface of the coating 70 through the translucent material 80. The light path 13 that reaches the outside can be divided into the light path 12 that passes through the translucent material 80 and is reflected by the coating 71 and reaches the outside. Further, a light path that passes through the translucent material 80 and is reflected by the coating 71 and further reflected by the inner slope 701 of the coating 70 and reaches the outside is also conceivable. As in the light paths 12 and 13, it is preferable to cover the mounting surface 51 with the coating 71 so that the light colliding with the coating 70 and the coating 71 can be efficiently extracted.

  As shown in FIG. 4, the mounting surface 51 on which the light emitting element 10 of the bump 40 and the substrate 50 is mounted is covered with a highly reflective coating 71 except for a portion where the light emitting element 10 is joined and a contact point of the circuit pattern 60. ing. Examples of the method for forming the coating 71 include transfer, coating, printing, and exposure. For example, a negative photoresist in which the developer at the exposed portion remains, or a positive photoresist from which the developer at the exposed portion is removed. By covering the substrate 50 with the highly reflective coating 71 in this manner, the light absorbed by the substrate as in the light path 12 can be reduced.

  In addition, the light emitting element 10 is preferably positioned higher than the coating 70. That is, the height L1 from the mounting surface 51 to the upper end of the light emitting element and the height L2 from the mounting surface 51 to the upper end of the film have a relationship of L1> L2. Preferably, L2 is preferably about 1/4 to 3/4 of L1.

  By setting the light emitting element 10 to a position higher than the film 70, the light hitting the film 70 like the light path 13 can be reduced, and the light directly coming out of the translucent resin like the light path 14 can be increased. Increasing the amount of light directly coming out of the translucent resin reduces reflection loss, so that the light extraction efficiency can be increased.

  FIG. 5 is an enlarged view of a cross section around the coating 70 of the present embodiment. The coating 70 includes a coating convex portion 75 and a coating base 76. When the film base 76 is defined as a “back surface” in contact with the substrate 50, the circuit pattern 60, or the film 71, the film base 76 has a “surface” that faces the back surface. For convenience of explanation, the light emission direction side is set to the upper side, and the opposite side is set to the lower side.

  The surface of the film base 76 is referred to as a film base surface 761, and the back surface of the film base 76 is referred to as a film base back surface 762. The outer peripheral surface of the coating base 76 stands substantially perpendicular to the mounting surface 51, and this outer peripheral surface is referred to as a coating base outer peripheral surface 763.

  The coating 70 includes a coating convex portion 75 protruding from the coating 76 on the coating base surface 761. The coating convex portion 75 and the coating base portion 76 are formed in an annular shape so as to surround the light emitting element 10. The distance between the outer periphery of the coating convex portion 75 and the center of the light emitting element 10 is a, and the distance between the outer periphery of the coating base portion 76 and the center of the light emitting element 10 is b. a is set smaller than b.

  Regarding the coating convex portion 75, the surface in contact with the coating base portion 76 is referred to as a coating convex portion rear surface 752, and the surface opposite to the coating convex portion rear surface 752 is referred to as a coating convex portion surface 751. The outer peripheral surface of the coating convex portion 75 stands substantially perpendicular to the mounting surface 51, and this outer peripheral surface is referred to as a coating convex portion outer peripheral surface 753.

  An edge is provided on the outer peripheral side on the surface side of the cross section of the coating convex portion 75, the edge is referred to as “edge α77”, and the angle is α. In the edge α77, the edge angle between the coating convex outer peripheral surface 753 and the coating convex surface 751 is α. Further, an edge is provided on the outer peripheral side on the surface side of the cross section of the coating base portion 76, the edge is referred to as “edge β78”, and the angle is β. In the edge β78, the edge angle between the coating base outer peripheral surface 763 and the coating base surface 761 is β.

  As shown in FIG. 5, the translucent material 80 is blocked by the edge α77 in the normal state. The edge α77 is a first damming portion, and the edge β78 is a second damming portion. In this manner, by providing the edge α77 serving as the first blocking portion and the edge β78 serving as the second blocking portion, even when the translucent material 80 flows out from the edge α77, the edge β78 can be blocked. The amount of change in the shape and thickness of the translucent material 80 can be reduced.

  The light-emitting element 10 according to the present embodiment is formed in an annular shape so as to surround the periphery of the light-emitting device 10 mounted on the mounting surface 51 (light-emitting surface), and the film base back surface 762 (first film) that contacts the mounting surface Back surface), coating base surface 761 (first coating surface) facing the coating base back surface 762, and outer periphery of the coating base formed from the edge β78 which is the outer periphery of the coating base surface 761 to the outer periphery of the coating base back surface 762 A coating base 76 (first coating) having a surface 763 (first outer peripheral surface) is provided.

  The light emitting device 100 is formed in an annular shape so as to protrude from the coating base surface 761, and has a coating convex back surface 752 (second coating back surface) that contacts the coating base surface 761 and a coating film facing the coating convex surface back surface 752. A convex surface 751 (second coating surface) and a coating convex peripheral surface 753 (second peripheral surface) formed from the edge α77, which is the outer periphery of the coating convex surface 751, to the outer periphery of the coating convex back surface 752. ). The coating convex outer peripheral surface 753 is located inside the coating base outer peripheral surface 763.

  The coating base 76 has a coating base inner peripheral surface 764 (first coating inner peripheral surface) formed from the inner periphery of the coating base surface 761 to the inner periphery of the coating base back surface 762. And a coating convex inner peripheral surface 754 (first coating inner peripheral surface) formed from the inner peripheral edge of the coating convex surface 751 to the inner peripheral edge of the coating convex back surface 752.

  The coating 70 is an annular inclined surface in which the coating base inner peripheral surface 764 and the coating convex inner peripheral surface 754 are continuously formed so that the ring diameter increases from the mounting surface toward the light emitting direction. A formed inner slope 701 is provided.

  FIG. 6 is an enlarged view of a cross section around the coating 70 when the translucent material 80 of the present embodiment flows out. FIG. 7 is an enlarged view of a cross section around the coating 70 when the first and second blocking portions are arranged. The detail of the effect of the film 70 provided with the 1st blocking part and the 2nd blocking part is demonstrated using FIG.6 and FIG.7.

  FIG. 6 shows a diagram when the translucent material 80 flows out from the edge α77 and is blocked by the edge β78 in the first embodiment. A solid line translucent material 80 </ b> C shows a shape when the translucent material 80 is blocked by the edge α <b> 77 which is the first blocking section. The two-dot chain line translucent material 80D shows a shape in a case where the translucent material 80 flows out from the edge α77 which is the first damming portion and is blocked by the edge β78 which is the second damming portion.

  Moreover, the area | region of the translucent material 80 which flowed out was made into the outflow area A, and the oblique line was drawn. Further, the distance between the light emitting element 80C in the light emitting direction and the light emitting element 10 is c, and the distance between the light transmitting material 80D in the light emitting direction and the light emitting element 10 is d. Further, the distance from the center O of the light emitting element 10 (see FIG. 4) to the edge α77 which is the first blocking part is a1, and the distance from the center O of the light emitting element 10 to the edge β78 which is the second blocking part is b1. It was.

  FIG. 7 is a diagram for comparison, and shows a diagram of the light emitting device 100 in which an edge α77 as a first blocking portion and an edge β78 as a second blocking portion are arranged. A solid line translucent material 80E shows a shape when the amount of the translucent material 80 is blocked by the first blocking section. The two-dot chain line translucent material 80 </ b> F shows a shape in a case where the translucent material 80 flows out of the first damming portion and is blocked by the second damming portion. Moreover, the area | region of the translucent material 80 which flowed out was made into the outflow area | region B, and the oblique line was drawn. Further, e is the distance between the light emitting surface of the translucent material 80E and the light emitting element 10, and f is the distance between the light emitting surface of the translucent material 80F and the light emitting element 10. The distance between the center O of the light emitting element 10 (see FIG. 4) and the edge α77 as the first blocking portion is a2, and the distance between the center O of the light emitting element 10 and the edge β78 as the second blocking portion is b2. .

  When FIG. 6 is compared with FIG. 7, (b1-a1) can be made smaller than (b2-a2), so the outflow region A is smaller than the outflow region B. Therefore, the amount of change (cd) in the thickness of the translucent material 80 in FIG. 6 is smaller than the amount of change (ef) in the thickness of the translucent material 80 in FIG. In this way, by providing the second blocking portion lower than the blocking portion on the outer peripheral side of the blocking portion, the amount of change in the shape and thickness of the transparent material 80 when the transparent material 80 flows out is reduced. can do. In addition, the tolerance of variation in the amount of the translucent material 80 can be increased, and the cost of an apparatus for managing the amount of resin can be reduced. In addition, since the influence of the translucent material 80 flowing out from the edge α77 (first blocking portion) can be reduced, even if the translucent material 80 flows out from the edge α77, the shape of the translucent material 80 is changed. A hemispherical shape can be obtained, and the light extraction efficiency can be improved.

  As shown in FIG. 6, the angle on the inner peripheral side (angle between the mounting surface 51 and the coating base inner peripheral surface 764) on the back surface (the coating base rear surface 762) side of the coating base 76 cross section is the angle X, and the coating convex 75 cross section. Assuming that the angle on the inner peripheral side (the angle between the mounting surface 51 and the coating convex inner peripheral surface 754) on the back surface (the coating convex portion rear surface 752) side is an angle Y, the angle X and the angle Y may be acute. preferable. Further, it is more preferable that the angle X is equal to the angle Y, and the coating convex inner peripheral surface 754 and the coating base inner peripheral surface 764 are continuous. As described above, the inner slope 701 is a surface where the coating convex inner peripheral surface 754 and the coating base inner peripheral surface 764 are continuous. By making the angle X and the angle Y acute, light can be efficiently reflected outside the light emitting device 100 as shown by the path 13 in FIG. 4, and the light extraction efficiency can be improved.

  The coating convex portion 75 and the coating base portion 76 are preferably made of a highly reflective or highly transmissive resin. According to such a configuration, light reflection / transmission loss can be reduced, so that light extraction efficiency can be improved. Examples of the method for forming the coating convex portion 75 and the coating base portion 76 include transfer, coating, printing, exposure, and cutting. For example, a negative photoresist in which the developer at the exposed portion remains, or a positive photoresist from which the developer at the exposed portion is removed.

  FIG. 8 is a diagram showing variations in the cross-sectional shape of the coating 70 of the first embodiment. As shown in FIG. 8, the cross-sectional shape of the coating 70 includes, for example, the cross-sectional shapes shown in FIGS. 8A to 8G other than the shape shown in FIG. 5. The coating convex portion 75 is formed on the coating base surface 761 of the coating base portion 76, and has an edge α77 inside the edge β78 (light emitting element 10 side). The coating convex portion 75 is formed on the coating base surface 761 of the coating base portion 76 and has a shape having an edge α77 inside the edge β78 (light emitting element 10 side). 76, the shape, angle, number of steps, and position of the coating 70 are not specified.

  As described above, the translucent material 80 includes a phosphor material. The material of the phosphor material is not limited, and it is a material that absorbs light and emits light after wavelength conversion. A material that emits light having a longer wavelength is preferable. Further, it is preferable that the phosphor material is uniformly dispersed in the translucent material 80.

  Further, as shown in FIG. 5, the translucent material 80 covers the light emitting element 10 and is filled up to the inside of the edge α77. The translucent material 80 is formed in a hemispherical shape on the light emitting element 10 and in a region surrounded by the coating convex portions 75. Examples of the translucent material 80 include organic compounds such as silicone resin and epoxy resin, and inorganic compounds such as low-melting glass.

  The translucent material 80 is dropped toward the light emitting element 10 in the edge α77 in a liquid state. The dropped translucent material 80 spreads according to gravity. Eventually, the translucent material 80 is blocked by the edge α77 due to surface tension, becomes hemispherical, and solidifies in that state.

  As described above, according to the light emitting device 100 according to the present embodiment, the coating 70 surrounding the light emitting element 10 has the coating convex portion 75 surrounding the light emitting element 10, and the outer peripheral edge of the coating convex portion 75. Since α77 is positioned on the inner side of the outer peripheral edge β78 of the coating base portion 76, the amount of change in the shape and thickness of the translucent material 80 when the translucent material 80 flows out from the edge α77 can be reduced. Can be reduced.

  Further, according to the light emitting device 100 according to the present embodiment, the tolerance of variation in the amount of the light transmissive material 80 can be increased, and the cost of the device for managing the amount of the light transmissive material 80 can be reduced. . Moreover, since the influence when the translucent material 80 flows out from the edge α77 can be reduced, the amount of the translucent material 80 can be increased, and the shape of the translucent material 80 can be made closer to a hemispherical shape. Therefore, the light extraction efficiency can be improved.

  As described above, the light emitting device 100 according to the present embodiment covers at least one or more light emitting elements 10, the mounting surface 51 on which the light emitting elements 10 are mounted, and the mounting surface 51 around the light emitting elements 10. A film (first film) formed in an annular shape so as to surround the light emitting element 10 and a translucent material including a phosphor material covering the light emitting element 10 are provided. In the light-emitting device 100, in the annularly formed film (first film), when the surface in contact with the mounting surface 51 is the first film back surface, the outer peripheral side on the surface (first film surface) side of the first film (Outer periphery) provided with an edge, and the coating has at least one annular convex portion surrounding at least one light emitting element on the coating surface, and the convex portion is convex when the surface in contact with the coating is the back surface. An outer edge on the outer peripheral side of the surface side of the convex portion, the outer peripheral edge on the front surface side of the convex portion is located on the inner side of the outer peripheral edge on the surface side of the coating, and covers the light emitting element The material is filled up to the outer peripheral edge of the convex portion.

  According to the light emitting device 100 according to the present embodiment, the edge on the outer periphery of the convex portion is the first damming portion, and the edge on the outer periphery of the coating is the second damming portion. Even if the light-transmitting material flows out from the edge of the outer periphery of the convex part due to insufficient formation, edge loss, dust adhesion to the edge, excessive supply of light-transmitting material covering the light emitting element due to variation, etc. The outflow range of the translucent material covering the light emitting element can be limited by the edge on the outer peripheral side of the film, and the shape and thickness of the film covering the light emitting element can be stabilized. Therefore, a light emitting device with less color unevenness can be obtained, and manufacturing defects can be reduced. Moreover, the tolerance of the variation in the resin amount can be increased, and the cost of the manufacturing apparatus can be reduced. Moreover, since the influence when the translucent material flows out from the edge can be reduced by controlling the contact angle, the amount of resin can be increased and the resin shape can be made closer to a hemispherical shape. Therefore, the light extraction efficiency can be improved.

Embodiment 2. FIG.
In the present embodiment, the setting of the angles (edge angles) of the edges α77 and β78 described in the first embodiment will be described.

  FIG. 9 is a cross-sectional view around the coating 70 of the present embodiment. The angle of the edge α77 is α, and the angle of the edge β78 is β. At this time, α and β are set such that 90 °> α> β. Thus, by setting β smaller than α, it is possible to reduce the amount of change in the thickness of the translucent material 80 when it flows out from the damming portion. This effect will be described below.

First, the relationship between the edge angle and the contact angle will be described with reference to FIGS. FIG. 10 is a diagram showing the balance of force when a liquid is dropped on the solid surface and the liquid becomes hemispherical. γ _S represents the surface tension of the solid, γ _L represents the surface tension of the liquid, γ _SL represents the interfacial tension between the solid and the liquid, and θ _A represents the angle of the contact angle. γ _S , γ _L , γ _SL , and θ _A can be expressed by the formulas (1) and (2) from Young's formula.
γ _S = γ _L cos θ _A + γ _SL formula (1)
cos θ _A = (γ _S −γ _SL ) / γ _L formula (2)

FIG. 11 is a diagram showing the balance of forces when a liquid is dropped on a solid surface having an edge and the liquid becomes hemispherical. γ _S represents the surface tension of the solid, γ _L represents the surface tension of the liquid, γ _SL represents the interfacial tension between the solid and the liquid, and θ _B represents the angle of the contact angle. The dihedral angle from the surface R1 that is outside the solid top surface and is coplanar with the solid top surface to the slope of the edge portion is S, and the angle from the solid top surface to the slope of the edge portion (also called the edge angle) is T. Then, the sum of S and T is 180 degrees. At this time, Equations (3) and (4) are established as modified types of Young's equation.
γ _S cos _S = γ _SL + γ _L cos θ Formula _B (3)
cos θ _B = (γ _S cos _S −γ _SL ) / γ _L formula (4)

In the equation (4), since 0 degree <S <180 degrees, −1 <cosS <1. Therefore, cos θ _B is always smaller than cos θ _{A in} equation (2). That is, the contact angle is larger when the edge portion is provided than when the edge portion is not provided. Further, as the edge angle T is smaller cosS becomes a small value, cos [theta] _B takes a small value. That is, as the angle of the edge portion (edge angle T) is small, the contact angle theta _B increases. Furthermore, the light extraction efficiency can be further improved by increasing the contact angle and making the shape of the translucent material 80 close to a hemispherical shape. As described above, by making the edges α77 and β78 have acute angles, it is possible to improve the light extraction efficiency as compared with the edge portion in which the edge angles are substantially vertical.

  Next, the relationship between the contact angle and the film thickness of the translucent material 80 will be described with reference to FIGS. FIG. 12 is a diagram showing the shape of the translucent material 80 when the angle of the edge α77 in FIG. 9 is changed and the shape of the translucent material 80 when the translucent material 80 is increased.

  In FIG. 12, a solid line translucent material 80 </ b> C shows a shape in a case where the translucent material 80 is blocked by an edge α <b> 77 having an angle α (α> β) which is the first blocking portion. The distance between the interface of the translucent material 80 in the light emitting direction and the light emitting element 10 is c.

  A two-dot chain line translucent material 80G shows a shape when the translucent material 80 is blocked by an edge α77 having an angle β (α> β) which is the first blocking portion. That is, the translucent material 80G has the shape of the translucent material 80 when the edge angle of the edge α77 is β. Let g be the distance between the light emitting element 10 and the interface of the light transmitting material 80G in the light emitting direction. At this time, g> c. The reason for this will be described below. That is, it will be explained that when the edge angle is smaller, the distance between the interface of the light transmissive material 80 in the light emitting direction and the light emitting element 10 is larger, and the light transmissive material 80 approaches a hemispherical shape.

  The one-dot chain line translucent material 80D flows out from the edge α77 of the angle α that is the first blocking portion, and the edge β78 of the angle β (α> β) that is the second blocking portion. The shape is shown when it is dammed up.

When the contour shape of the translucent material 80 is approximated to a perfect circle, the droplet height h, the contact radius r, and the contact angle θ in FIG.
h = r × tan (θ / 2) Equation (5)

  Since θ <180 °, the smaller the contact angle θ, the smaller the droplet height h. On the other hand, the contact angle θ decreases as the angle of the edge increases from the equation (4). Therefore, c <g from β <α, and the amount of change in the thickness of the translucent material 80 when flowing out from the edge α77 can be reduced.

  Thus, by setting β <α, it is possible to reduce the amount of change in the thickness of the translucent material 80 when it flows out from the edge α77 as compared with the case where β ≧ α. As described above, the edge α77 and the edge β78 are acute angles, and β <α, so that the light extraction efficiency is improved while stabilizing the shape and thickness of the translucent material 80 as compared with the conventional substantially vertical shape. Can be improved.

  FIG. 13 is a diagram showing variations in the cross-sectional shape of the film 70 of the present embodiment. Note that the variations shown in FIGS. 13A to 13G are not limited except for the angles of the edge α77 and the edge β78 of the coating 70. Since no specification is made except for the edge β78, the cross-sectional shape of the coating 70 may be any of FIGS. 13A to 13G, for example.

  As a means for changing the edge angle (edge angle), for example, there is a method of adjusting the wavelength of light to be exposed. Specifically, in the case of a negative type photoresist, if the wavelength of the light to be exposed is shortened, it tends to attenuate, so that light does not reach the deep part, and the formed resist has a trapezoidal shape with the exposure surface as the long side. There are ways to take advantage of.

  As described above, the light emitting device 100 according to the present embodiment is characterized in that the angle of the outer peripheral edge on the surface side of the coating convex portion 75 is larger than the angle of the outer peripheral edge on the surface side of the coating base 76. And That is, the edge angle (second angle) of the edge α77 formed by the coating convex surface 751 and the coating convex outer peripheral surface 753 is the edge angle 78 of the edge β78 formed by the coating base surface 761 and the coating base outer peripheral surface 763. It is larger than the edge angle (first angle). The edge angle (second angle) of the edge α77 and the edge angle (first angle) of the edge β78 are acute angles. Alternatively, it may be a substantially right angle or an obtuse angle (see FIGS. 13A to 13G).

  As described above, according to the light emitting device 100 according to the present embodiment, the translucent material in the case where the translucent material flows out from the outer peripheral edge of the coating convex surface 751 by controlling the contact angle. The amount of change in thickness can be reduced, and color unevenness can be reduced.

Embodiment 3 FIG.
FIG. 14 is a plan view of the light emitting device 103 according to the present embodiment as viewed from above. FIG. 15 is a cross-sectional view around the coating 70A and the coating 70B of the light emitting device 103 according to the present embodiment. FIG. 16 is an enlarged view of a cross section around the coating 70A and the coating 70B of the light emitting device 103 according to the present embodiment. In FIG. 14, the translucent material 80 is omitted.

  FIG. 14 is a diagram corresponding to FIG. 2 described in the first embodiment. FIG. 15 corresponds to FIG. 1 described in the first embodiment. FIG. 16 is a diagram corresponding to FIG. 6 described in the first embodiment. In the light emitting device 103 of the present embodiment, the film 70 is different from the light emitting device 100 of the first embodiment. 14 to 16, components having the same functions as those described in the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

  As shown in FIG. 14 and FIG. 15, specifically, the light emitting device 103 according to the present embodiment is not a film 70, but a film 70 </ b> A formed in an annular shape (ring shape) so as to surround the light emitting element 10. And at least one film 70B formed in an annular shape (ring shape) so as to surround the light emitting element 10 and the film 70A.

  The light emitting device 103 according to the present embodiment is a film 70A (second film) formed in an annular shape so as to surround the periphery of the light emitting element 10, and includes a second film back surface that contacts the mounting surface 51, A coating 70A having a second coating surface facing the second coating back surface and a second outer peripheral surface formed from the outer periphery of the second coating surface to the outer periphery of the second coating back surface is provided. The light emitting device 103 is a coating 70B (first coating) formed in an annular shape so as to surround the coating 70A, and includes a first coating back surface that contacts the mounting surface 51, and a first coating back surface. And a first outer peripheral surface formed from the outer peripheral edge of the first coating surface to the outer peripheral edge of the first coating back surface. The height from the mounting surface 51 to the first coating surface is not more than the height from the mounting surface 51 to the second coating surface.

  Examples of the method for forming the coating 70A and the coating 70B include transfer, coating, printing, and exposure. For example, a negative photoresist in which the developer at the exposed portion remains, or a positive photoresist from which the developer at the exposed portion is removed.

  As shown in FIG. 15, the height L3 of the coating 70A and the height L4 of the coating 70B are preferably lower than the height L1 of the light emitting element 10. In addition, the height L4 of the coating 70B is preferably the same height as the height L3 of the coating 70A or lower than the height L3 of the coating 70A. By making the film 70A and the film 70B lower than the light emitting element 10, light hitting the film 70A and the film 70B can be reduced and light extraction efficiency can be increased.

  FIG. 16 is an enlarged view of a cross section around the coating 70A and the coating 70B. Assuming that the surface of the coating 70A that contacts the substrate 50 is a “back surface”, the edge on the outer peripheral side of the coating 70A is an edge α′77 ′, and the angle is α ′. Further, when the surface of the coating 70B that contacts the substrate 50 is a “rear surface”, the edge on the outer peripheral side of the coating 70B is an edge β′78 ′, and the angle is β ′. At this time, 90 °> α ′> β ′ is set.

  The surface of the coating 70A is a coating surface 751A (second coating surface), the back surface is a coating back surface 752A (second coating back surface), and the outer peripheral surface is a coating outer peripheral surface 753A (second outer peripheral surface). Further, the surface of the coating 70B is a coating surface 761B (first coating surface), the back surface is a coating back surface 762B (first coating back surface), and the outer peripheral surface is a coating outer peripheral surface 763B (first outer peripheral surface). The edge α′77 ′ corresponds to the first damming portion described in the first embodiment, and the edge β′78 ′ corresponds to the second damming portion.

  With the above configuration, when the translucent material 80 flows out from the edge α′77 ′, the amount of change in the thickness of the translucent material 80 can be reduced. This effect will be described with reference to FIG.

  A solid-line translucent material 80C ′ shows a shape when the translucent material 80 is blocked by an edge α′77 ′ having an angle α ′ (α ′> β ′) which is the first blocking portion. . That is, the outer peripheral surface of the coating 70A is the coating outer peripheral surface 753A-1. At this time, the distance between the interface of the translucent material 80 and the light emitting element 10 is c ′.

  A two-dot chain line translucent material 80G ′ shows a shape when the translucent material 80 is dammed at the edge α′77 ′ having an angle β ′ (α ′> β ′) as the first damming portion. ing. That is, the edge angle of the coating 70A (the angle between the coating surface 751A and the coating outer peripheral surface 753A) is β ′, and the outer peripheral surface of the coating 70A is the coating outer peripheral surface 753A-2 (the outer peripheral surface indicated by the dotted line). This is the case. At this time, the distance between the interface of the translucent material 80G ′ and the light emitting element 10 is g ′.

  The one-dot chain line translucent material 80D ′ flows out from the edge α′77 ′ of the angle α ′, which is the first blocking portion, and the angle β ′ (α ′), which is the second blocking portion. The shape in the case of being blocked by the edge β′78 ′ of> β ′) is shown. At this time, since c ′ <g ′ from β ′ <α ′, the amount of change in the thickness of the translucent material 80 when the translucent material 80 flows out from the edge α′77 ′ can be reduced. In this way, by setting β ′ <α ′, the amount of change in the thickness of the translucent material 80 can be reduced as compared with the case where β ′ ≧ α ′.

  Further, by setting 90 °> α ′> β ′, the contact angle can be increased and the shape of the translucent resin can be approximated to a hemispherical shape compared to the case where the edge angle is vertical, so that light extraction is possible. Efficiency can be improved.

  As described above, according to the light emitting device 103 according to the present embodiment, even if the resin flows out from the edge α′77 ′ that is the first damming portion, the edge β′78 becomes the second damming portion. Therefore, the amount of change in the shape and thickness of the translucent material 80 when the translucent resin flows out from the edge α′77 ′ can be reduced, and color unevenness can be reduced. In addition, the tolerance of variation in the amount of the light transmissive material 80 can be increased, and the cost of an apparatus for managing the amount of the light transmissive material 80 can be reduced. Moreover, since the influence when the translucent material 80 flows out from the edge α′77 ′ can be reduced, the amount of the translucent material 80 can be increased and the shape of the translucent resin shape 80 can be made closer to a hemispherical shape. it can. Therefore, the light extraction efficiency can be improved. Furthermore, the amount of change in the thickness of the translucent material 80 when the translucent material 80 flows out can be reduced as compared with the case of β ′ ≧ α ′.

  The light-emitting device 103 according to the present embodiment includes a light-emitting element, a light-emitting surface on which the light-emitting element is mounted, and a first annular ring that covers the light-emitting surface around the light-emitting element and surrounds the light-emitting element. A transparent film including a coating (coating 70A), a second coating (coating 70B) formed in an annular shape so as to surround the light emitting element and the annular coating (coating 70A), and a phosphor material covering the light emitting device. A light-emitting device including a light-emitting material, wherein the first coating includes a first edge on an outer peripheral side on a front surface side of the first coating, and a surface that contacts the light-emitting surface is a first edge. When the surface of the coating is a back surface that is in contact with the light emitting surface, the second coating is provided with a second edge on the outer peripheral side on the surface side of the second coating, and the angle of the first edge is larger than the angle of the second edge, Filling the translucent material up to the first edge; It was.

  As described above, according to the light emitting device 103 according to the present embodiment, the first edge serves as the first damming portion and the second edge serves as the second damming portion. The light-transmitting material flows out of the first edge due to insufficient edge formation, edge loss, dust adhering to the edge, excessive supply of light-transmitting material covering the light-emitting element due to variations, etc. However, the outflow range of the translucent material can be limited by the second edge, and the shape and thickness of the coating covering the light emitting element can be stabilized. Therefore, a light emitting device with less color unevenness can be obtained, and manufacturing defects can be reduced. Moreover, the tolerance of the variation in the resin amount can be increased, and the cost of the manufacturing apparatus can be reduced. Since the influence when the translucent material flows out from the edge can be reduced, the amount of resin can be increased and the resin shape can be made closer to a hemispherical shape. Therefore, the light extraction efficiency can be improved. Further, by controlling the contact angle, it is possible to reduce the amount of change in the thickness of the translucent material when the translucent material flows out from the outer peripheral edge of the convex surface, and to reduce color unevenness. .

Embodiment 4 FIG.
FIG. 17 is an enlarged view of a cross section around the coating 70 according to the present embodiment. The present embodiment is characterized in that the coating convex portion 75 of the light emitting device 100 described in the description of the first and second embodiments is a coating convex portion 75a containing an oil repellent. FIG. 17 is a diagram corresponding to FIG. 5 described in the first embodiment. Components having the same functions are denoted by the same reference numerals, and description thereof is omitted.

  In the embodiment described below, the constituent parts indicating the portions of the film convex portions 75a and 75b and the film base portions 76a and 76b corresponding to the film convex portion 75 and the film base portion 76 described in the first embodiment are as follows. Similar to the coating convex portions 75a and 75b and the coating base portions 76a and 76b, the subscripts a and b are given for description.

  In FIG. 17, the coating 70 includes a coating convex portion 75 a and a coating base portion 76 a. The coating convex portion 75a (second coating) is located at the same position as the coating convex portion 75 and contains an oil repellent. The film base 76a (first film) is located at the same position as the film base 76 and does not contain an oil repellent.

  Of the coating convex portion 75a, it is preferable that only the outer peripheral portion (coating convex portion outer peripheral surface 753a) contains the oil repellent. The oil repellent may be any oil repellent. Moreover, it is preferable that α> β.

  The coating convex portion 75a containing the oil repellent component has a smaller contact angle with the translucent resin than when the oil repellent component is not included. Therefore, according to the light emitting device 100 according to the present embodiment, by including the oil repellent component, the height of the translucent material 80 when it does not flow out from the edge α77 is smaller than when the oil repellent is not included. it can. Therefore, the amount of change in the thickness of the translucent material 80 when the translucent material 80 flows out from the edge α77 can be reduced.

  In addition, since only the outer peripheral side portion of the coating convex portion 75a (the coating convex portion outer peripheral surface 753a) contains the oil repellent, the light hitting the portion containing the oil repellent can be reduced, so that the light extraction efficiency is improved. Can be improved.

  As described above, the light emitting device 100 according to the present embodiment is formed in an annular shape so as to surround the light emitting element, with the annular convex portion (the coating convex portion 75a) surrounding the light emitting element on the surface of the film including the oil repellent. The coating (coating base 76a) is characterized by not containing an oil repellent.

  In the light emitting device 100 according to the present embodiment, when the wettability of the surface of the coating is controlled, the translucent material flows out from the edge α77 on the outer peripheral side of the surface of the coating convex portion 75a and is blocked by the edge β78. The amount of change in the thickness of the translucent material can be reduced, and color unevenness can be reduced. In addition, the use range of the oil repellent can be reduced, and the light extraction efficiency can be improved.

Embodiment 5 FIG.
FIG. 18 is an enlarged view of a cross section around the coatings 70A and 70B of the present embodiment. The present embodiment is characterized in that the film 70A of the light-emitting device 103 described in Embodiment 3 is a film 70Aa containing an oil repellent. FIG. 18 is a diagram corresponding to FIG. 16 described in the third embodiment. Components having the same functions are denoted by the same reference numerals, and description thereof is omitted.

  Further, in the embodiment described below, the constituent parts indicating the portions of the coatings 70Aa and 70Ab and the coatings 70Ba and 70Bb corresponding to the coatings 70A and 70B described in the third embodiment are described as coatings 70Aa and 70Ab and coating 70Ba. , 70Bb, a and b are added and expressed.

  In FIG. 18, the coating 70Aa contains an oil repellent, and the coating 70Ba does not contain an oil repellent. Of the coating 70Aa, it is preferable that only the portion on the outer peripheral side (the coating outer peripheral surface 753Aa) contains the oil repellent. The reason is the same as that described in the fourth embodiment. The oil repellent may be any oil repellent.

  As described above, according to the light emitting device 103 according to the present embodiment, the translucent material 80 when it does not flow out from the edge α′77 ′ as compared with the case where the oil repellent component is not included due to the oil repellent component being included. Can be reduced in height. Therefore, the amount of change in the thickness of the translucent material 80 when the translucent material 80 flows out from the edge α′77 ′ can be reduced.

  As described above, according to the light emitting device 103 according to the present embodiment, the second coating (coating 70A) includes the oil repellent and the first coating (coating 70B) does not include the oil repellent. By controlling the wettability of the translucent material, the translucent material flows out from the second edge (edge α′77 ′) and is blocked by the first edge (edge β′78 ′). The amount of change in thickness can be reduced, and color unevenness can be reduced.

Embodiment 6 FIG.
FIG. 19 is an enlarged view of a cross section around the film 70 of the present embodiment. In the present embodiment, the light emitting device 100 described in the first, second, and fourth embodiments is characterized in that the film base 76 is a film base 76b containing a water repellent. FIG. 19 is a diagram corresponding to FIG. 5 described in the first embodiment and FIG. 17 described in the fourth embodiment. Components having similar functions are denoted by the same reference numerals, and description thereof is omitted. To do.

  In the present embodiment, the coating convex portion 75b does not contain a water repellent, and the coating base portion 76b contains a water repellent. Of the coating base 76b, the inner peripheral surface side (the coating base inner peripheral surface 764b) where the light emitting element 10 is provided preferably does not contain a water repellent. It is possible to reduce the light hitting the portion containing the water repellent agent by including the water repellent agent only in the outer peripheral side portion (the coat base outer peripheral surface 763b) of the coat base portion 76b, so that the light extraction efficiency is improved. This is because it can be improved. In addition, the water repellent agent should just have water repellency.

  As described above, according to the light emitting device 100 according to the present embodiment, the contact angle at the edge β78 when the translucent material 80 flows out can be increased because the film base 76b includes the water repellent component. it can. Therefore, the amount of change in the thickness of the translucent material 80 when the translucent material 80 flows out can be reduced, and the light extraction efficiency can be improved.

  As described above, according to the light emitting device 100 according to the present embodiment, the annular coating convex portion 75b (second coating) surrounding the light emitting element on the mounting surface 51 does not contain a water repellent and surrounds the light emitting element. By controlling the wettability of the surface so that the annular film base 76b (first film) contains a water repellent, the translucent material is removed from the outer peripheral edge of the convex surface. The amount of change in the thickness of the translucent material when it flows out can be reduced, and color unevenness can be reduced.

Embodiment 7 FIG.
FIG. 20 is an enlarged view of a cross section around the coatings 70A and 70B of the present embodiment. The present embodiment is characterized in that the film 70B of the light-emitting device 103 described in Embodiments 3 and 5 is a film 70Bb containing a water repellent. FIG. 20 corresponds to FIG. 16 described in the third embodiment and FIG. 18 described in the fourth embodiment. Components having the same functions are denoted by the same reference numerals, and description thereof is omitted. To do.

  In the present embodiment, the coating 70Ab (second coating) does not contain a water repellent, and the coating 70Bb (first coating) contains a water repellent. Of the coating 70Bb, the inner peripheral surface side (the inner peripheral surface 764Bb) where the light emitting element 10 is provided preferably does not contain a water repellent. In addition, the water repellent agent should just have water repellency.

  As described above, according to the light emitting device 103 according to the present embodiment, the coating 70Bb includes the water repellent component, so that the contact angle at the edge β′77 ′ when the translucent material 80 flows out can be increased. . Therefore, the amount of change in the thickness of the translucent material 80 when the translucent material 80 flows out can be reduced, and the light extraction efficiency can be improved.

  As described above, according to the light emitting device 103 according to the present embodiment, the second coating (coating 70Ab) does not include the water repellent, and the first coating (coating 70Bb) includes the water repellent. By controlling the wettability of the surface, the amount of change in the thickness of the translucent material when the translucent material flows out from the second edge (edge α′77 ′) is reduced, and color unevenness is reduced. be able to.

Embodiment 8 FIG.
FIG. 21 is an explanatory diagram 1 of an etching method in the light emitting device 100 according to the present embodiment. FIG. 22 is an explanatory diagram 2 of the etching method of the light emitting device 100 according to the present embodiment. An etching method of the light emitting device 100 according to this embodiment will be described with reference to FIGS.

  The present embodiment is characterized in that in the light emitting device 100 described in the first, second, fourth, and sixth embodiments, an alkaline solution is applied to the surface of the film base 76 and an etching process is performed. Hereinafter, the procedure of the etching process on the substrate 50 for forming the film base 76 and the film convex part 75 will be described with reference to FIG.

  As shown in FIG. 21A, after forming a circuit pattern 60 on the substrate 50, a negative photoresist 1010 is applied. Further, a mask 1010 is arranged on the negative photoresist 1010 so as not to be exposed to the exposure light 1000 at a place where the film base 76 is to be formed, and is exposed. When exposed, the exposed portion increases the solubility in the developer, and the portion not exposed by the mask 1010 is not dissolved by the developer.

  Next, as shown in FIG. 21B, an alkaline developer 1030 is applied to the photoresist 1010 of the substrate 50, and is left in that state for a certain period of time.

  Thereafter, when the photoresist 1010 dissolved together with the alkaline developer is washed away, the state shown in FIG. As shown in FIG. 21C, a photoresist 1010 at a position where the mask 1010 is disposed is formed as a film base 76.

  Next, as shown in FIG. 21 (d), a positive type photoresist 1050 liquid is applied to the surface of the substrate 50 where the film base 76 is present so that the liquid level of the photoresist 1050 is higher than the film base 76. The substrate 50 is exposed so as not to be exposed to the exposure light 1040 by masking the portion other than the portion where the coating convex portion 75 is to be formed using the mask 1060 so that only the portion where the coating convex portion 75 is to be formed is exposed.

  When exposed, as shown in FIG. 21 (e), the solubility in the developer is reduced at the exposed portion, and the solubility in the developer is increased at the non-exposed portion.

  Thereafter, when the photoresist 1050 is washed away with a developing solution, the state shown in FIG. As shown in FIG. 21 (f), the portion of the photoresist 1050 that has been exposed and not dissolved by the developer remains as the film convex portion 75. Note that the etching process is preferably performed before the light emitting element 10 is mounted.

  Next, a method for increasing the hydrophobicity of the coating base 76 will be described with reference to FIG. By increasing the hydrophobicity of the coating base 76, the contact angle of the translucent resin when the translucent resin is blocked by the edge β78 of the coating base 76 can be increased.

  As shown in FIG. 22, after forming the coating convex portion 75, the portion other than the position where the coating base portion 76 is to be etched is hidden by a mask 1080, and an alkaline solution 1090 is applied and etched. The present embodiment relates to a method for applying the alkaline solution 1090, and does not limit the formation method and material of the coating convex portion 75 and the coating base 76.

  As shown in the present embodiment, by applying an alkaline solution 1090 to the coating base 76 and performing an etching process, a highly hydrophilic portion of the surface of the coating base 76 is eluted. Therefore, the hydrophobicity of the coating base 76 is increased, and the contact angle at the edge β78 of the coating base 76 can be increased. Moreover, since the surface area of the interface between the film base 76 and the translucent material 80 is increased by etching, the contact angle of the translucent material 80 can be increased.

  As described above, the contact angle can be increased and the light extraction efficiency can be improved by applying an alkali solution to at least the surface of the film base 76 and performing an etching process.

  The method for manufacturing the light emitting device 100 according to the present embodiment is formed in an annular shape so as to cover the light emitting element, the light emitting surface on which the light emitting element is mounted, and the light emitting surface around the light emitting element. And a translucent material including a phosphor material that covers the light emitting element, wherein the annularly formed coating is formed on the outer peripheral side of the coating surface when the surface contacting the light emitting surface is the coating back surface. And the coating film is etched with an alkaline solution, and a translucent material covering the light emitting element is filled up to the edge on the outer peripheral side of the convex portion. Thus, according to the method for manufacturing light emitting device 100 according to the present embodiment, the contact angle can be increased without using a water repellent, and the light extraction efficiency can be improved.

  In addition, according to the method for manufacturing light emitting device 100 according to the present embodiment, the annular convex portion surrounding the light emitting element on the surface of the coating is not etched with an alkaline solution, and is annular so as to surround the light emitting element. The thickness of the translucent material when the translucent material flows out from the outer peripheral edge of the convex surface by controlling the surface wettability by etching the coating formed on the surface with an alkaline solution. The amount of change in color can be reduced, and color unevenness can be reduced.

Embodiment 9 FIG.
An etching method of the light emitting device 103 according to this embodiment is described. The present embodiment is characterized in that, in the light emitting device 103 described in the third, fifth, and seventh embodiments, an alkali solution is applied to the surface of the coating 70B and etched. In the following description, reference is made to FIG.

  By applying an alkaline solution to the coating 70B and performing an etching process, a highly hydrophilic portion of the surface of the coating 70B is eluted. Therefore, the hydrophobicity of the coating 70B is increased, and the contact angle can be increased. In addition, since the surface area of the interface between the coating 70B and the translucent material 80 is increased by etching, the contact angle can be increased. Thus, by applying an alkaline solution to at least the surface of the film 70B and performing an etching process, the contact angle was increased, and the translucent resin flowed out of the edge α'77 'and was dammed by the edge β'78'. In some cases, the light extraction efficiency can be improved.

  The light emitting device 103 according to the present embodiment is characterized in that the second film (film 70A) is not etched with an alkaline solution, and the first film (film 70B) is etched. . Thereby, when the translucent material flows out from the second edge (edge α′77 ′), the amount of change in the thickness of the translucent material can be reduced, and color unevenness can be reduced.

Embodiment 10 FIG.
FIG. 23 is a plan view of the light emitting device 110 according to the present embodiment as viewed from above. FIG. 24 is an enlarged view of a cross section around the coating 70 according to the present embodiment, (a) is an enlarged view of a cross section passing through the coating base outer peripheral portion 76 oL, and (b) passes through the coating base outer peripheral portion 76 oH. It is an enlarged view of a cross section. FIG. 25 is a plan view of an example of the light emitting device 110 according to the present embodiment as seen from above. FIG. 26 is a schematic view of the translucent material 80 as seen from above when the translucent material 80 flows out from the edge α77 in the present embodiment.

  In the light emitting device 110 according to the present embodiment, at least two types of portions on the outer peripheral side of the coating convex portion 75 in the coating base portion 76 described in the first, second, fourth, sixth, and eighth embodiments in the circumferential direction. It is characterized by having a height.

  In the light emitting device 110, a portion of the coating base 76 on the outer peripheral side of the coating convex outer peripheral surface 753 is a coating base outer peripheral portion 76o, and the other portion is a coating base inner peripheral portion 76i. The coating base outer peripheral portion 76o is composed of a coating base outer peripheral portion 76oH and a coating base outer peripheral portion 76oL having a plurality of heights. For example, the height T2 of the coating base outer periphery 76oH is higher than the height T1 of the coating base outer periphery 76oL.

  FIG. 24A is an enlarged view of a cross section passing through the coating base outer periphery 76oH, and FIG. 24B is an enlarged view of a cross section passing through the coating base outer periphery 76oL. When the height of the coating base outer peripheral portion 76oL is T1, the height of the coating base outer peripheral portion 76oH is T2, and the height of the coating convex portion 75 is T3, T1 <T2 <T3 is set. As shown in FIG. 23, the coating base outer peripheral portion 76oL and the coating base outer peripheral portion 76oH are formed so as to be alternately arranged in the circumferential direction of the coating 70.

  Next, the effect of the film 70 according to the present embodiment will be described. When the translucent material 80 flows out of the edge α77 due to dust adhesion, edge loss, or the like at a part of the edge α77 where the coating base outer peripheral portion 76oH is on the outer peripheral side, the translucent material 80 is It flows into the coating base outer peripheral portion 76oH on the outer peripheral side. Since there is nothing higher than the coating base portion 76oH and lower than the coating convex portion 75 around the coating base outer peripheral portion 76oH, the outflow of the translucent material 80 is blocked by this single coating base outer peripheral portion 76oH. .

  Further, when the translucent material 80 flows out from the edge α77 due to dust adhering, missing edge, or the like from a part of the edge α77 where the coating base outer peripheral portion 76oL is on the outer peripheral side, the translucent material 80 is moved to the edge α77. Flows into the coating base outer peripheral portion 76oL on the outer peripheral side. Around the coating base outer periphery 76oL, there are two coating base outer peripheral portions 76oH that are higher than the coating base outer periphery 76oL and lower than the coating convex 75. That is, there are two coating base outer peripheral portions 76oH on both sides in the circumferential direction of the coating base outer peripheral portion 76oL.

  Therefore, the translucent material 80 that has flowed out from the edge α77 flows into the two coating base outer peripheral portions 76oH. Since there is nothing higher than the coating base outer peripheral portion 76oH and lower than the coating convex portion 75 around the coating base outer peripheral portion 76oH, the outflow of the translucent material 80 is caused by the surface tension and the one coating base outer peripheral portion 76oL. It is dammed by the two coating bases 76oH.

  As described above, by providing the second damming portions (edge β78) having different heights in the circumferential direction on the outer peripheral side of the first damming portion (edge α77), the outflow range of the translucent material 80 can be reduced. It is possible to limit, stabilize the shape and thickness of the resin, and reduce color unevenness.

  As shown in FIG. 25, the coating base outer peripheral portion 76 o is preferably formed in a shape in which the coating base outer peripheral portion 76 o H is formed in a bow shape along the coating convex outer peripheral surface 753 of the coating convex portion 75. It is preferable that the bow-shaped film base outer peripheral part 76oH is continuously arranged in the circumferential direction, and a substantially triangular film base outer peripheral part 76oL is formed between the adjacent bow-shaped film base outer peripheral parts 76oH. .

  According to the configuration as described above, when the translucent material 80 flows out of the edge α77 due to reasons such as dust adhesion and edge loss in a part of the edge α77 where the coating base outer peripheral portion 76oH is on the outer peripheral side, The translucent material 80 flows into the coating base outer peripheral portion 76oH on the outer peripheral side of the edge α77. The shape of the translucent material 80 at that time is as shown in FIGS. 26A and 26B when viewed from above.

  FIG. 26A is a diagram in the case where the coating base outer peripheral portion 76o has a bow shape along the coating convex outer peripheral surface 753 of the coating convex portion 75. FIG. FIG. 26 (b) shows a case in which fan-shaped film base outer peripheral portions 76oH and film base outer peripheral portions 76oL are alternately arranged along the film convex outer peripheral surface 753 of the film convex 75 instead of the bow shape. FIG. That is, as shown in FIG. 23, the coating base outer periphery 76oH and the coating base outer periphery 76oL are alternately arranged.

  Comparing FIG. 26 (a) and FIG. 26 (b), FIG. 26 (a) is more spherical. Thus, when the shape of the coating base outer peripheral portion 76oH of the coating base outer peripheral portion 76o is made into a bow shape, the translucent material 80 flows out from a part of the edge α77 and is blocked by the coating base outer peripheral portion 76oH portion. However, the translucent material 80 can be damped in a more spherical shape. Therefore, it is possible to improve the light extraction efficiency, stabilize the shape and thickness of the resin, and reduce color unevenness.

  In the light emitting device 110 according to the present embodiment, a portion of the coating film (coating base portion 76) formed in an annular shape so as to surround the light emitting element is located on the outer peripheral side of the convex portion (coating convex portion 75). Therefore, when the translucent material flows out from the second edge (edge α77), the outflow range can be limited, and the translucent material can be limited. It is possible to suppress changes in the shape and thickness of the conductive material and reduce color unevenness.

Embodiment 11 FIG.
FIG. 27 is a plan view of the light emitting device 111 according to the present embodiment as viewed from above. For convenience of explanation, the translucent resin is omitted. In the light-emitting devices 100, 103, and 110 described in Embodiments 1 to 10, a plurality of light-emitting elements 10 may exist inside the coating 70 or the coating 70A.

  As shown in FIG. 27, the light-emitting device 111 according to the present embodiment has a plurality of light-emitting elements 10 mounted in a film 70 formed in an annular shape. In the light emitting device 111, the four light emitting elements 10 are arranged in a circle on the substrate 50. Therefore, the film 70 can be formed in a circular ring shape (ring shape). According to such a configuration, the translucent material 80 can be dropped once, so that productivity can be improved.

Embodiment 12 FIG.
FIG. 28 is a plan view of the light emitting device 112 of the present embodiment as viewed from above. For convenience of explanation, the translucent resin is omitted. In the light emitting devices 100, 103, 110, and 111 described in Embodiments 1 to 10, the shape of the coating 70 or the coating 70A is not circular, and may be any shape such as an ellipse, a rectangle, a rhombus, or a polygon.

  As shown in FIG. 28, the light emitting device 112 according to the present embodiment has a plurality of light emitting elements 10 mounted in a film 70 formed in an elliptical annular shape. In the light emitting device 112, the three light emitting elements 10 are arranged in series on the substrate 50. The coating 70 can be formed in an elliptical annular shape (ring shape). According to such a configuration, the translucent material 80 can be dropped once, so that productivity can be improved. Moreover, since the film 70 can be formed in an arbitrary shape as described above, Embodiments 1 to 11 can be applied to a light source (light emitting element 10) arranged in an arbitrary shape. it can.

Embodiment 13 FIG.
In the present embodiment, the translucent material 80 will be described. In the first to twelfth embodiments, the translucent material 80 may not include a phosphor material. Moreover, the inorganic filler may be included. The inorganic filler is preferably nano silica having a primary particle size of several nm. The inorganic filler is preferably distributed uniformly in the translucent material 80. By not including a phosphor, it can be used when it is not desired to change the wavelength of light, but it is desired to protect the light emitting element and improve the light extraction efficiency. Moreover, by including an inorganic filler, by increasing the viscosity of the translucent material 80, it is possible to adjust the time until it is dropped from the dropping device, and the manufacturing can be facilitated.

  In the light-emitting device described above, the height of the light-emitting element from the light-emitting surface is higher than the height of the coating from the light-emitting surface, so that light hitting the coating can be reduced and light extraction efficiency can be improved.

  In the above-described light-emitting device, the light-transmitting material is any one of a silicone resin, an epoxy resin, and a low-melting glass, and is dropped into the film in a liquid state and blocked by the edge. . Since the translucent material has a high transmittance and a low melting point, it has a high light extraction efficiency and can be easily manufactured.

  Moreover, in the light-emitting device described above, the light-transmitting resin includes an inorganic filler. Therefore, the time until the liquid is dropped from the dropping device can be adjusted, and the manufacturing can be facilitated.

  Further, in the light emitting device described above, the translucent resin is characterized by not including a phosphor material. Therefore, by not including the phosphor, it is not desired to change the wavelength of light, but the light emitting element is protected. It can also be used to improve the light extraction efficiency.

  Although the first to thirteenth embodiments have been described above, the thirteen embodiments may be partially combined. One of these embodiments may be partially implemented.

  10 light emitting elements, 11 light paths, 11A, 11B, 12, 13, 14 paths, 20 wires, 30 bonding agents, 40 bumps, 50 substrates, 51 mounting surfaces, 60 circuit patterns, 70, 70A, 70Aa, 70Ab, 70B , 70Ba, 70Bb, 71 coating, 75, 75a, 75b coating convex, 76, 76a, 76b coating base, 76i coating base inner periphery, 76o, 76oH, 76oL coating base outer periphery, 77 edge α, 78 edge β, 80, 80A, 80B, 80C, 80D, 80E, 80F, 80G Translucent material, 100, 103, 110, 111, 112, 200 Light emitting device, 201 Damping portion, 701 Inner slope, 751 Coating convex surface, 751A Coating Front surface, 752 Coating film back surface, 752A Coating film back surface, 753 Coating film projection outer peripheral surface, 753A 753A-1, 753A-2 Coated outer peripheral surface, 754 Coated convex inner peripheral surface, 761 Coated base surface, 761B Coated surface, 762 Coated base rear surface, 762B Coated back surface, 763 Coated base outer peripheral surface, 763B Coated outer peripheral surface, 764 Coated base Inner peripheral surface, 1000 light, 1010 photoresist, 1020 mask, 1030 alkaline developer, 1040 light, 1050 photoresist, 1060 mask, 1070 developer, 1080 mask, 1090 alkali solution.

Claims (12)

In a light emitting device having a light emitting surface on which a light emitting element is mounted,
A first film formed in an annular shape so as to surround the periphery of the light emitting element, a first film back surface contacting the light emitting surface, and a first film surface facing the first film back surface; A first coating having a first outer peripheral surface formed from an outer peripheral edge of the first coating surface to an outer peripheral edge of the first coating back surface;
A second coating formed in an annular shape so as to protrude from the first coating surface, a second coating back surface contacting the first coating surface, and a second coating facing the second coating back surface And a second coating having a second outer peripheral surface formed from an outer peripheral edge of the second coating surface to an outer peripheral edge of the second coating back surface,
The light emitting device, wherein the second outer peripheral surface is located on an inner side than the first outer peripheral surface. The first coating has a first inner peripheral surface formed from an inner peripheral edge of the first coating surface to an inner peripheral edge of the first coating back surface,
The second coating has a second inner peripheral surface formed from the inner peripheral edge of the second coating surface to the inner peripheral edge of the second coating back surface,
The light emitting device further includes:
The first inner peripheral surface and the second inner peripheral surface are one annular inclined surface formed continuously, and are formed so that the ring diameter increases from the light emitting surface toward the light emitting direction. The light emitting device according to claim 1, further comprising a slope. In a light emitting device having a light emitting surface on which a light emitting element is mounted,
A second coating formed in an annular shape so as to surround the periphery of the light emitting element, a second coating back surface contacting the light emitting surface, and a second coating surface facing the second coating back surface A second coating having a second outer peripheral surface formed from an outer peripheral edge of the second coating surface to an outer peripheral edge of the second coating back surface;
A first coating formed in an annular shape so as to surround the second coating, the first coating back contacting the light emitting surface, and the first coating facing the first coating back A first coating having a surface and a first outer peripheral surface formed from an outer peripheral edge of the first coating surface to an outer peripheral edge of the first coating back surface;
The height from the said light emission surface to the said 1st film surface is below the height from the said light emission surface to the said 2nd film surface, The light-emitting device characterized by the above-mentioned.   The second angle formed by the second coating surface and the second outer peripheral surface is larger than the first angle formed by the first coating surface and the first outer peripheral surface. The light emitting device according to any one of claims 1 to 3.   The light emitting device according to claim 4, wherein the first angle is an acute angle.   The light emitting device according to claim 4, wherein the second angle is an acute angle.   The first coating has at least two kinds of heights from the light emitting surface to the first coating surface in a portion outside the second outer peripheral surface of the first coating. It has, The light-emitting device in any one of Claims 1-6 characterized by the above-mentioned.   The light emitting device according to claim 1, wherein the second film includes an oil repellent, and the first film does not include an oil repellent.   The light emitting device according to claim 1, wherein the second film does not contain a water repellent, and the first film contains a water repellent.   The light emitting device according to claim 1, wherein the first film is etched with an alkaline solution, and the second film is not etched with an alkaline solution.   The light emitting device according to claim 1, wherein a height from the light emitting surface to the surface of the second film is lower than a height from the light emitting surface to the light emitting element. The light emitting device further includes:
A translucent material that changes from a liquid to a solid, dropped as a droplet on the light emitting element in a liquid state, and spreading of the dropped droplet is blocked by the outer peripheral edge of the second coating surface The light-emitting device according to claim 1, comprising a translucent material solidified in a state.

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