JP2019004191A - Light emitting device and method for manufacturing the same - Google Patents

Abstract

To provide a light emitting device improved in light extraction efficiency.SOLUTION: A light emitting device 100 includes: a package 2; a light emitting element 1 placed on the package 2; and a translucent member 5 covering the light emitting element 1. The translucent member 5 and the package 2 have a plurality of projections on the top surface 5a and the top surface 4a, respectively. The translucent member 5 contains particles of a translucent first filler 52 with a lower refractive index than the base material 51 of the translucent member 5. A part of particles of the first filler 52 is exposed in the air from the base material 51 of the translucent member 5 at the top surface 5a of the translucent member 5.SELECTED DRAWING: Figure 1C

Description

  The present invention relates to a light emitting device including a light emitting element and a method for manufacturing the same.

Light emitting diodes (LEDs) are used in various applications such as lighting fixtures, personal computers (PCs), television backlights, and large displays. As LED light sources increase in demand for such various applications, demands for improving light output are also increasing.
For example, Patent Document 1 includes a wiring substrate having a recess, a light emitting element accommodated in the recess, and a light transmitting sealing member that seals the light emitting element, and the surface of the light transmitting sealing member is roughened. An optical semiconductor device is disclosed. Patent Document 2 includes a base, a light-emitting element placed on the base, and a sealing member that seals the light-emitting element, and by placing filler particles on the surface side of the sealing member. A light emitting device provided with unevenness is disclosed.

JP 2007-324220 A JP 2012-151466 A

  However, since such a method requires a change in the material and shape of the constituent members, the shape and material of the applicable light emitting device may be limited.

  An object of the embodiment according to the present disclosure is to provide a light emitting device with improved light extraction efficiency and a method for manufacturing the same.

  A light-emitting device according to an embodiment of the present disclosure includes a base, a light-emitting element placed on the base, and a translucent member that covers the light-emitting element, and the translucent member and the base Each has a plurality of protrusions on each upper surface, and the light transmissive member contains particles of a light transmissive first filler having a refractive index lower than that of the base material of the light transmissive member. Part of the particles of 1 filler is exposed from the base material of the translucent member on the upper surface of the translucent member.

  A method for manufacturing a light emitting device according to an embodiment of the present disclosure is a method for manufacturing a light emitting device including a base, a light emitting element mounted on the base, and a translucent member that covers the light emitting element. Then, after the light emitting element is placed on the base, a step of forming the light transmissive member covering the light emitting element, and a blasting process on each upper surface of the light transmissive member and the base In the step of forming the translucent member, the translucent member uses a translucent resin as a base material, and the translucent first has a lower refractive index than the base material. A part of the particles of the first filler is formed on the top surface of the translucent member by forming the resin material containing the filler particles and performing the blasting process. Expose from the base material.

  According to the light emitting device and the manufacturing method thereof according to the embodiment of the present disclosure, it is possible to provide a light emitting device with improved light extraction efficiency.

It is a perspective view which shows the structure of the light-emitting device which concerns on 1st Embodiment. It is a top view which shows the structure of the light-emitting device which concerns on 1st Embodiment. It is sectional drawing which shows the structure of the light-emitting device which concerns on 1st Embodiment, and shows the cross section in the IC-IC line of FIG. 1B. It is sectional drawing which shows a part of translucent member and filler in the light-emitting device which concerns on 1st Embodiment. It is sectional drawing which shows a translucent member and a part of filler in the conventional light-emitting device. In the light-emitting device concerning 1st Embodiment, it is sectional drawing for demonstrating the light reflection in the upper surface of a translucent member and a light shielding member. It is a flowchart which shows the procedure of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is sectional drawing which shows the structure of the package prepared at the package preparation process of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is sectional drawing which shows the light emitting element mounting process of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is sectional drawing which shows the resin supply process of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is sectional drawing which shows the resin hardening process of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is sectional drawing which shows the blasting process process of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is a top view which shows the 1st example of the direction which projects an abrasive | polishing agent in the blasting process process of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is a top view which shows the 2nd example of the direction which projects an abrasive | polishing agent in the blast processing process process of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is a top view which shows the 3rd example of the direction which projects an abrasive | polishing agent in the blasting process process of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is sectional drawing which shows a 1st process in the blasting process process of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is sectional drawing which shows a 2nd process in the blasting process process of the manufacturing method of the light-emitting device which concerns on 1st Embodiment. It is a perspective view which shows the structure of the image display apparatus using the light-emitting device which concerns on 1st Embodiment. It is a disassembled perspective view which shows the structure of the image display apparatus using the light-emitting device which concerns on 1st Embodiment. It is a perspective view which shows the structure of the light-emitting device which concerns on 2nd Embodiment. It is a top view which shows the structure of the light-emitting device which concerns on 2nd Embodiment. It is sectional drawing which shows the structure of the light-emitting device which concerns on 2nd Embodiment, and shows the cross section in the VIIIC-VIIIC line | wire of FIG. 8B. It is a flowchart which shows the procedure of the manufacturing method of the light-emitting device which concerns on 2nd Embodiment.

  Hereinafter, the light emitting device and the manufacturing method thereof according to the embodiment will be described. Note that the drawings referred to in the following description schematically show the present embodiment, and therefore the scale, spacing, positional relationship, etc. of each member are exaggerated, or some of the members are not shown. There may be. Moreover, in the following description, about what attached | subjected the same name and code | symbol, the same or the same member is shown in principle, and detailed description shall be abbreviate | omitted suitably.

<First Embodiment>
[Configuration of light emitting device]
The configuration of the light emitting device according to the first embodiment will be described with reference to FIGS. 1A to 1C.
FIG. 1A is a perspective view showing the configuration of the light emitting device according to the first embodiment. FIG. 1B is a plan view showing the configuration of the light emitting device according to the first embodiment. FIG. 1C is a cross-sectional view showing the configuration of the light emitting device according to the first embodiment, and shows a cross section taken along the line IC-IC in FIG. 1B.

  In addition, in FIG. 1C, the part enclosed with the broken line of the upper surface vicinity of a light-shielding member and a translucent member is each expanded and shown. Moreover, in FIG. 1C, two types of 1st fillers are shown by the circle and the rhombus, and the 2nd filler is shown by the circle. These shapes do not indicate the specific shapes of the corresponding members, but are used for the sake of convenience to distinguish the type of filler particles.

The light emitting device 100 according to the first embodiment includes a base, a light emitting element 1 placed on the base, and a translucent member 5 that covers the light emitting element 1. The translucent member 5 and the base have a concavo-convex shape, that is, a plurality of protrusions, on their upper surfaces. The translucent member 5 contains particles of the first translucent filler 52 having a lower refractive index than that of the base material 51 of the translucent member 5, and some of the particles of the first filler 52 are transparent. The upper surface of the optical member 5 is exposed from the base material 51 of the translucent member 5. The base corresponds to the package 2.
More specifically, the light emitting device 100 has a substantially square shape in plan view, and is disposed in the package 2 having the recess 2a that opens on the upper surface side, the light emitting element 1 mounted in the recess 2a, and the recess 2a. And a translucent member 5 that covers the light emitting element 1. The package 2 includes a lead electrode 3 and a light shielding member 4, and the light emitting element 1 is electrically connected to the lead electrode 3 disposed on the bottom surface of the recess 2 a using a wire 6.

The light emitting element 1 is mounted in the recess 2 a of the package 2. In the present embodiment, three light emitting elements 11, 12, and 13 having different emission colors are mounted in the recess 2a. For example, the emission color of the light emitting element 11 can be blue, the emission color of the light emitting element 12 can be green, and the emission color of the light emitting element 13 can be red.
Hereinafter, the three light emitting elements 11, 12, and 13 may be referred to as “light emitting element 1” unless particularly distinguished from each other.

  The light emitting elements 11, 12, and 13 are die-bonded on the lead electrode 33 disposed at the center of the bottom surface 2b of the recess 2a. In addition, an anode electrode that is one of the electrodes of the light emitting elements 11, 12, and 13 is electrically connected to the lead electrode 34 using the wire 6. Further, the cathode electrode, which is the other electrode of the light emitting elements 11, 12, 13, is electrically connected to any one of the corresponding lead electrodes 31, 32, 33 using the wire 6. That is, the three light emitting elements 11, 12, and 13 are configured to be able to apply voltages independently. Accordingly, the light emitting elements 11, 12, and 13 can be individually turned on, and the luminance levels of the light emitting elements 11, 12, and 13 can be arbitrarily adjusted, and the light emission color and brightness of the light emitting device 100 can be adjusted. It can be changed arbitrarily. Therefore, the light emitting device 100 can be used as one pixel of a color image display device.

The light emitting element 1 used here is not particularly limited in shape, size, semiconductor material, and the like. As the luminescent color of the light emitting element 1, the thing of arbitrary wavelengths can be selected according to a use. The light-emitting elements 11 and 12 that emit blue and green light have an emission wavelength in the near-ultraviolet to visible light region, and are In _X Al _Y Ga _1-XY N (0 ≦ X ≦ 1, 0 ≦ Y ≦ 1, X + Y ≦ 1). The light emitting element which consists of a nitride semiconductor represented by this can be used suitably. As the light emitting element 13 that emits red light, a GaAs, AlInGaP, or AlGaAs based semiconductor can also be used.
In the present embodiment, the light emitting element 1 may have positive and negative electrodes arranged on the same surface side, or may have positive and negative electrodes arranged on different surface sides. When the light emitting element 1 in which positive and negative electrodes are arranged on the same surface side is used, either a face-up mounting type or a face-down mounting type may be used. In addition, when a plurality of light emitting elements 1 are mounted, different mounting types may be mixed.

  Note that the number of light emitting elements 1 mounted in the recess 2a may be one or more, and the combination of light emission colors when the plurality of light emitting elements 1 are mounted, the outer shape of the light emitting elements 1 and the like are appropriately changed. be able to.

  The package 2 includes a lead electrode 3 and a light-shielding member 4, and has a substantially square outer shape in plan view, and is provided with a recess 2a having an opening on the upper surface side. The recess 2 a is a region for mounting the light emitting element 1, and the bottom surface 2 b of the recess 2 a is composed of the lead electrode 3 and the light shielding member 4. Further, the side wall of the recess 2 a is constituted by a light shielding member 4.

The lead electrode 3 is composed of four lead electrodes 31 to 34, and is a wiring for connecting the three light emitting elements 11 to 13 electrically connected via the wire 6 to an external power source.
Each of the lead electrodes 31 to 34 constitutes the bottom surface 2b of the recess 2a, and each of the lead electrodes 31 to 34 extends to the end of the light-shielding member 4 in a plan view and bends downward at the end. The light-shielding member 4 is arranged so as to bend inward along the lower surface of the light-shielding member 4. In the light emitting device 100, the lower surface side is a mounting surface, and the portions of the lead electrodes 31 to 34 that are bent inwardly on the lower surface side of the light shielding member 4 are bonded using a conductive bonding member such as solder. It is a junction.

Further, the portion of the lead electrodes 31 to 34 exposed at the bottom surface 2 b of the recess 2 a is a portion that is electrically connected to the light emitting elements 11 to 13 through the wire 6. The lead electrode 31 is electrically connected to the cathode electrode of the light emitting element 11, the lead electrode 32 is electrically connected to the cathode electrode of the light emitting element 12, and the lead electrode 33 is electrically connected to the cathode electrode of the light emitting element 13. The lead electrode 34 is electrically connected to the respective anode electrodes of the light emitting elements 11 to 13.
Moreover, the lead electrode 33 is arrange | positioned in the center part of the bottom face 2b of the recessed part 2a, and it serves also as the light emitting element arrangement | positioning area | region where the light emitting elements 11-13 are joined using a die-bonding member.

The lead electrode 3 can be formed by punching or bending a flat metal plate. The sheet metal as the raw material is not particularly limited as long as it is used for the lead frame of the light emitting device package. The thickness of the sheet metal is appropriately selected according to the shape and size of the package. For example, a thickness of about 100 to 500 μm is used, and a thickness of 120 to 300 μm is more preferable. Further, as a material for the sheet metal, for example, a Cu-based alloy is used.
In addition, the upper surface of the lead electrode 3 serving as the bottom surface 2b of the recess 2a is subjected to a plating treatment such as Ag, Au, Ni, etc. in order to improve the light reflectivity and / or the bondability with the wire 6 or the die bond member. May be.

The light shielding member 4 is a member that fixes the four lead electrodes 31 to 34 apart from each other and constitutes the side wall of the recess 2a. The light blocking member 4 is made of a material that blocks light without transmitting light, and a light reflecting material that blocks light by reflecting light or a light absorbing material that blocks light by absorbing light is used. It is done.
Specifically, the light-shielding member 4 can be formed using a resin material containing a light-transmitting resin as a base material 41 and a second filler 42 for imparting light-shielding properties as a filler. . In addition, the upper surface 4a of the light-shielding member 4 that is the upper surface of the side wall of the recess 2a has part of the particles of the second filler 42 exposed from the base material 41, and the unevenness caused by the particles of the second filler 42. It has a shape or protrusion.

When a light reflective material is used for the light blocking member 4, the light blocking member 4 transmits light that has been emitted from the light emitting element 1, propagated through the light transmitting member 5 and reached the light blocking member 4. 5 to return to within. Thereby, the light extraction efficiency from the upper surface of the light emitting device 100 can be improved.
When a light absorbing material is used for the light blocking member 4, the light blocking member 4 absorbs light emitted from the light emitting element 1, transmitted through the light transmitting member 5 and incident on the light blocking member 4. . For this reason, light can be emitted only from the upper surface of the light emitting device 100.

  In addition, regardless of whether a light-reflecting material or a light-absorbing material is used for the light-shielding member 4, by providing such a light-shielding member 4, light emission from the light-emitting device 100 is translucent. Since it is limited to the upper surface of the member 5, the light-emitting device 100 having a high contrast between the light-emitting region and the non-light-emitting region and a good so-called “parting ability” can be obtained.

Examples of the resin used for the base material 41 of the light shielding member 4 include a thermoplastic resin and a thermosetting resin.
In the case of a thermoplastic resin, for example, polyphthalamide resin, liquid crystal polymer, polybutylene terephthalate (PBT), unsaturated polyester, and the like can be used.
In the case of a thermosetting resin, for example, an epoxy resin, a modified epoxy resin, a silicone resin, a modified silicone resin, or the like can be used.

When the light-shielding member 4 has light reflectivity, the light-shielding member 4 is formed using a resin material that is provided with light-reflecting material particles as the second filler 42 in the base material 41. can do. Examples of the light reflecting material include TiO ₂ , Al ₂ O ₃ , ZrO ₂ , and MgO.
The inner surface of the recess 2a preferably has a reflectance of 70% or more, more preferably 80% or more in the wavelength range of light emitted from the light emitting element 1. The content of the second filler 42 that is a light reflecting material in the light shielding member 4 may be 5% by mass or more and 50% by mass or less, and preferably 10% by mass or more and 30% by mass or less.
The particle size of the second filler 42 is preferably about 0.1 μm or more and 0.5 μm or less. By setting the particle size of the second filler 42 within this range, the light blocking member 4 can obtain good light reflectivity.
Unless otherwise specified, in this specification, the particle size values of various fillers and abrasives are the values determined by the air permeation method or Fisher-SubSieve-Sizers-No. (FS method).

  The plurality of protrusions on the upper surface 4a of the light-shielding member 4 are preferably formed so as to have an arithmetic average roughness Ra defined by JIS standard B0601: 2013 to be about 0.090 μm or more and 0.210 μm or less. In particular, extraneous light can be scattered more efficiently by setting the upper surface 4a of the light-shielding member 4 to an arithmetic average roughness Ra of 0.130 μm or more.

When the light-shielding member 4 has light absorptivity, the above-described base material 41 is formed using a resin material that is provided with light absorptivity by containing light-absorbing substance particles as the second filler 42. be able to. Examples of the light absorbing substance used for the second filler 42 include black pigments, and more specifically, carbon-based pigments such as carbon black and graphite.
In addition, the particle size and content in the case of using a light-absorbing substance as the second filler 42 can be approximately the same as in the case of using the above-described reflective substance. For example, when carbon black is added as the second filler 42, the amount can be about 1% by mass. Furthermore, for example, about 25% by mass of wollastonite as a reinforcing agent may be added as another filler.

  The light-shielding member 4 includes a resin material that is provided with light reflectivity or light absorption by containing the second filler 42 in the base material 41, a transfer molding method using a mold, an injection molding method, It can be formed by a molding method such as a compression molding method or a coating method such as a screen printing method.

The plurality of protrusions on the upper surface 4 a of the light-shielding member 4 can be formed by subjecting the upper surface 4 a to blast processing and exposing some of the particles of the second filler 42 from the base material 41. That is, the plurality of protrusions on the upper surface 4 a of the light shielding member 4 are preferably formed due to the particles of the second filler 42.
By using the plurality of protrusions formed due to the particles of the second filler 42 having a particle diameter in the above-described range, the specularly reflected light component of the external light reflected by the upper surface 4a of the light-shielding member 4 is satisfactorily reduced. Can do. When the light emitting device 100 is used as a pixel of an image display device, even when external light is irradiated on the image display device, the regular reflection light component of the external light is reduced, so that the pixel does not depend on the observation direction. Can be recognized well.

The translucent member 5 is a sealing member that is provided in the recess 2 a of the package 2 and seals the light emitting element 1.
The translucent member 5 is used to adjust the viscosity of the uncured resin when the translucent resin is formed using the translucent resin as the base material 51, or to impart light diffusibility to the translucent member 5. As a filler, the first filler 52 is contained. Further, the upper surface 5 a of the translucent member 5 has a part of the particles of the first filler 52 exposed from the base material 51, and has an uneven shape, that is, a plurality of protrusions caused by the particles of the first filler 52. doing.

  The first filler 52 contained in the translucent member 5 may be one type, but may contain two types of first fillers 52a and 52b as in the present embodiment, and more than three types. May be. Specifically, the first filler 52a and the first filler 52b may be made of different materials, or may be made of the same material but having different particle sizes and shapes. Good.

Moreover, you may make it the translucent member 5 contain the particle | grains of light absorptive substances, such as carbon black, as another filler to such an extent that translucency is not impaired. By allowing the light-transmitting member 5 to contain an appropriate amount of light-absorbing substance particles, it is possible to suppress emission of regular reflection light from the light extraction surface on the surface of the lead electrode 3 or the like. Thereby, the light distribution characteristic of the emitted light from the light emitting device 100 can be improved.
Furthermore, the translucent member 5 may contain particles such as a phosphor, a color pigment, and a light diffusing substance having a refractive index higher than that of the base material 51 as necessary.

As the base material 51 of the translucent member 5, a thermosetting resin having translucency can be used, and examples thereof include a silicone resin, an epoxy resin, and a urea resin. Further, as the first filler 52, a light transmissive material having a refractive index lower than that of the base material 51 is used. Specific examples of the first filler 52 include SiO ₂ . For example, when an epoxy resin having a refractive index of 1.53 is used as the base material 51, SiO ₂ having a refractive index of 1.46 can be used as the first filler 52.
Moreover, it is preferable that the particle size of the 1st filler 52 shall be about 0.5 micrometer or more and 10 micrometers or less. By setting the particle diameter of the first filler 52 within this range, the specularly reflected light component of external light on the upper surface 5a is efficiently reduced by the plurality of protrusions formed due to the particles of the first filler 52. be able to.
Moreover, it is preferable that content of the 1st filler 52 in the translucent member 5 shall be about 2 mass% or more and 40 mass% or less.

  The plurality of protrusions on the upper surface 5a of the translucent member 5 are preferably formed so as to have an arithmetic average roughness Ra specified by JIS standard B0601: 2013 of about 0.095 μm to 0.220 μm. More preferably, it is 180 μm or less.

Further, by exposing the first filler 52 having a refractive index lower than that of the base material 51 on the upper surface 5a of the light transmissive member 5 which is a light extraction surface of the light emitting device 100, the light transmissive member 5 and light are extracted. The difference in refractive index from air (refractive index of 1.0), which is the medium to be measured, can be reduced. Further, by reducing the refractive index difference at the interface from which light is extracted, the light reflectance at the interface can be reduced. Therefore, the light extraction efficiency to the outside of the light emitting device 100 can be increased. Here, if the refractive index difference between the base material 51 and the first filler 52 is 0.03 or more, the light extraction efficiency of the light emitting device 100 can be increased by exposing the first filler 52.
The details of the mechanism that improves the light extraction efficiency of the light emitting device 100 will be described later.

  Further, by providing a plurality of protrusions on the upper surface 4a of the light-shielding member 4 and the upper surface 5a of the light-transmitting member, which are the upper surfaces of the light emitting device 100, contact is made when the upper surface contacts other members. Thus, tacking (adhesion) of other members can be prevented, and the light emitting device 100 can be easily handled during manufacturing or mounting.

  The wire 6 is a wiring for electrically connecting electronic components such as the light emitting element 1 and the protection element and the lead electrodes 31 to 34. Examples of the material of the wire 6 include metals such as Au (gold), Ag (silver), Cu (copper), Pt (platinum), Al (aluminum), and alloys thereof. It is preferable to use Au excellent in thermal conductivity and the like. In addition, the thickness of the wire 6 is not specifically limited, It can select suitably according to the objective and a use.

[Operation of light emitting device]
Next, the operation of the light emitting device 100 will be described with reference to FIGS. 1C and 2A to 2C.
FIG. 2A is a cross-sectional view illustrating a part of the translucent member and the filler in the light emitting device according to the first embodiment. FIG. 2B is a cross-sectional view illustrating a part of the translucent member and the filler in the conventional light emitting device. FIG. 2C is a cross-sectional view for explaining light reflection on the upper surfaces of the light-transmissive member and the light-shielding member in the light-emitting device according to the first embodiment.
In addition, the upper surface 5a of the translucent member 5 that is a light extraction surface of the light emitting device 100 will be described as being in contact with air.

  By connecting an external power source to the lead electrodes 31 to 34, the light emitting element 1 emits light. The light from the light emitting element 1 propagates through the translucent member 5 and is reflected directly or on the bottom surface or the inner surface of the recess 2a and taken out from the upper surface 5a. On the upper surface 5a, part of the light from the light emitting element 1 is extracted to the outside through the interface between the base material 41 and air. In the portion where the particles of the first filler 52 are arranged in the vicinity of the upper surface 5a, the light from the light emitting element 1 is extracted outside through the interface between the first filler 52 and air.

Here, a case where light is extracted outside through the first filler 52 will be described.
As shown in FIG. 2A, when the surface of the first filler 52 is exposed from the base material 51, the light L1 propagating upward in the translucent member 5 is generated between the first filler 52 and air. It is taken out through the interface.
In addition, as shown in FIG. 2B, when the surface of the first filler 52 is covered with the base material 51, the light L2 propagating upward in the translucent member 5 is generated between the base material 51 and the air. It is taken out through the interface.

In general, when light enters an interface having a refractive index difference, a part of the incident light to the interface is reflected according to the refractive index difference. Assuming that the refractive indexes of two media sandwiching the interface are n ₁ and n ₂ , the reflectance R of light incident perpendicularly to the interface can be expressed by equation (1).
R = (n ₁ −n ₂ ) ² / (n ₁ + n ₂ ) ² (1)

Therefore, when the light extraction surface of the light emitting device 100 is in contact with air, the outermost surface of the upper surface 5a of the translucent member 5 that is the light extraction surface is lower in refractive index than the resin that is the base material 51, that is, The first filler 52 having a smaller refractive index difference from air can reduce light reflection at the interface with air. As a result, the light extraction efficiency of the light emitting device 100 can be increased.
When light propagates from a relatively high refractive index medium to a low refractive index medium, the light is totally reflected at the interface based on Snell's law. By reducing the refractive index difference at the interface between the translucent member 5 and air, the amount of light totally reflected at the interface can be reduced. That is, the light extraction efficiency to the outside can be increased from the viewpoint of reducing total reflection.

  For example, when the light emitting device 100 is used as a pixel of an image display device, illumination light such as a fluorescent lamp may be incident on the upper surface of the light emitting device 100 as external light. When the upper surface of the light emitting device 100 is a flat surface, the upper surface is a glossy surface, and many components of external light are regularly reflected (specular reflection). As shown in FIG. 2C, when the light L3 is incident on the upper surface 5a of the translucent member 5 as external light, most of the light L3 is regularly reflected like the light L5. For this reason, when observing from the direction in which the external light is regularly reflected (the traveling direction of the light L5), the surface of the light emitting device 100 appears brightly under the influence of the specularly reflected light component of the external light. The contrast of light and darkness is reduced. That is, the visibility of the image displayed by the image display device is reduced by the so-called “shine” on the surface.

  Here, by providing a protrusion due to the particle size of the first filler 52 on the upper surface 5a, the light L3 can be diffusely reflected like the light L4. In other words, the specular reflection light component can be reduced. For this reason, even if it observes from the direction in which external light is regularly reflected, the fall of the contrast of the brightness of the emitted light from the light-emitting device 100 can be reduced.

  Note that, similarly to the upper surface 5a of the light transmissive member 5, a part of the light L6 that is external light is regularly reflected on the upper surface 4a like the light L8 on the upper surface 4a of the light shielding member 4. Here, by providing a protrusion due to the particle size of the second filler 42 on the upper surface 4a, the light L6 can be diffusely reflected like the light L7. For this reason, even when observing from the direction in which external light is regularly reflected (the traveling direction of the light L8), it is possible to reduce the decrease in contrast of light and darkness of the light emitted from the light emitting device 100.

  Note that the surface roughness of the upper surface 5a and the upper surface 4a is preferably in the above-described range. If the surface is too rough, the upper surface 5a and the upper surface 4a of the light emitting device 100 may appear cloudy, and the contrast of light and darkness of the light emitting device 100 may decrease instead. By setting the particle diameters of the first filler 52 and the second filler 42 in the above-described range and providing protrusions due to the first filler 52 and the second filler 42 on the upper surface 5a and the upper surface 4a, the surface roughness is obtained. Can be in an appropriate range.

[Method for Manufacturing Light Emitting Device]
Next, a method for manufacturing the light emitting device according to the first embodiment will be described with reference to FIGS.
FIG. 3 is a flowchart showing the procedure of the method for manufacturing the light emitting device according to the first embodiment. FIG. 4A is a cross-sectional view illustrating a configuration of a package prepared in a package preparation process of the light emitting device manufacturing method according to the first embodiment. FIG. 4B is a cross-sectional view illustrating the light emitting element mounting step of the method for manufacturing the light emitting device according to the first embodiment. FIG. 4C is a cross-sectional view illustrating a resin supply process of the method for manufacturing the light emitting device according to the first embodiment. FIG. 4D is a cross-sectional view showing the resin curing step of the method for manufacturing the light emitting device according to the first embodiment. FIG. 4E is a cross-sectional view showing the blasting process of the method for manufacturing the light emitting device according to the first embodiment. FIG. 5A is a plan view illustrating a first example of a direction in which an abrasive is projected in the blasting process of the method for manufacturing the light emitting device according to the first embodiment. FIG. 5B is a plan view showing a second example of the direction in which the abrasive is projected in the blast processing step of the method for manufacturing the light emitting device according to the first embodiment. FIG. 5C is a plan view showing a third example of the direction in which the abrasive is projected in the blast processing step of the method for manufacturing the light emitting device according to the first embodiment. FIG. 6A is a cross-sectional view showing the first step in the blasting treatment step of the method for manufacturing the light emitting device according to the first embodiment. FIG. 6B is a cross-sectional view showing a second step in the blast processing step of the method for manufacturing the light emitting device according to the first embodiment.
4A to 4E, the package 2 shows only the upper surface constituting the bottom surface 2b and the side wall of the recess 2a, and the lower portion is omitted.

In the method for manufacturing the light emitting device 100 according to the first embodiment, after the light emitting element 1 is placed on the package 2, the step of forming the light transmissive member 5 covering the light emitting element 1, the light transmissive member 5, and the package Blasting the top surface of each of the two. In the step of forming the translucent member 5, the translucent member 5 uses a translucent resin as the base material 51, and the particles of the translucent first filler 52 having a refractive index lower than that of the base material 51. It is formed using the contained resin material. A part of the particles of the first filler 52 is exposed from the base material 51 of the translucent member 5 on the upper surface of the translucent member 5 by the step of performing the blast processing.
The manufacturing method of the light emitting device 100 according to the first embodiment includes a package preparation step S11, a light emitting element mounting step S12, a translucent member forming step S13, and a blast processing step S14. Moreover, translucent member formation process S13 contains resin supply process S131 and resin hardening process S132.

The package preparation step S11 is a step of preparing the package 2 having the recess 2a in which the lead electrode 3 is disposed on the bottom surface 2b and the light-shielding member 4 is surrounded as a side wall and opened upward.
Specifically, in this step, first, a lead frame having the outer shape of the lead electrode 3 is formed by punching a sheet metal by press working. Next, the lead frame is sandwiched between upper and lower molds having cavities corresponding to the shape of the light shielding member 4. Next, by injecting a resin material containing the second filler 42 into the resin used as the base material 41 into the cavity in the mold, and solidifying or curing the resin material, the light shielding member 4 is removed from the mold. It is formed integrally with the lead electrode 3. Next, the package 2 is prepared by bending the lead electrode 3 protruding from the side surface of the light shielding member 4 along the side surface and the lower surface of the light shielding member 4.
In the package 2 prepared in this step, the second filler 42 disposed in the vicinity of the upper surface 4 a of the light shielding member 4 is covered with a base material 41.

  The light emitting element mounting step S <b> 12 is a process for mounting the light emitting element 1 in the recess 2 a of the package 2. In this step, the light-emitting elements 1 (11 to 13) are die-bonded on the lead electrodes 33, and each light-emitting element 1 is electrically connected to the corresponding lead electrodes 31 to 34 using the wires 6.

  Translucent member formation process S13 is the process of forming the translucent member 5 which coat | covers the light emitting element 1 in the recessed part 2a, after mounting the light emitting element 1 in the recessed part 2a. As described above, the translucent member forming step S13 includes the resin supply step S131 and the resin curing step S132.

First, in the resin supply step S131, a resin material containing the first filler 52 (52a, 52b) in the uncured resin as the base material 51 is supplied to the recess 2a by a potting method using the dispenser 71, for example. .
Next, in the resin curing step S132, the resin material is cured by heating using a heating device 72 such as a heater or a reflow furnace. Thereby, the translucent member 5 is formed.
In the translucent member 5 formed in this step, the first filler 52 disposed in the vicinity of the upper surface 5 a is covered with the base material 51.

The blast processing step S <b> 14 is a step of performing a blast processing on the upper surface 5 a of the translucent member 5 and the upper surface 4 a of the light shielding member 4. By this step, the first filler 52 disposed in the vicinity of the upper surface 5a and the second filler 42 disposed in the vicinity of the upper surface 4a are exposed, and a protrusion due to the first filler 52 is formed on the upper surface 5a. In addition, a protrusion due to the second filler 42 is formed on the upper surface 4a.
By performing a blasting process so that the first filler 52 and the second filler 42 are exposed, the upper surface 5a and the upper surface 4a are finely roughened, so that the light diffusibility of the upper surface 5a and the upper surface 4a is improved. The antireflection effect can be obtained on the surface.

  The blasting process is preferably performed by a wet blasting method. For example, the blasting process is performed by projecting a slurry in which pure water contains an abrasive 74 from a nozzle 73 onto a surface to be processed. The wet blast method can reduce the impact of the abrasive 74 on the object to be processed as compared to the drive blast method. For this reason, it can be removed by selectively scraping off a relatively soft resin material without damaging the inorganic particles used in the first filler 52 and the second filler 42. Also, the wet blasting method is suitable for fine processing because a smaller diameter abrasive 74 can be used. Therefore, the base material 51 and the base material that cover the surfaces of the first filler 52 and the second filler 42 without forming rough irregularities on the upper surface 5a of the translucent member 5 and the upper surface 4a of the light-shielding member 4. 41 can be removed. Thereby, the particles of the first filler 52 and the particles of the second filler 42 are exposed on the upper surface 5a and the upper surface 4a, respectively, and the protrusions caused by the particles of the first filler 52 and the particles of the second filler 42 are exposed. Can be formed.

Specifically, when removing the base material 51 covering the first filler 52 near the upper surface 5a and the base material 41 covering the second filler 42 near the upper surface 4a, the first filler is removed. It is preferable to perform a blasting process so that 52 and the second filler 42 are not separated from the base material 51 and the base material 41 as much as possible.
Specifically, the particle size of the abrasive 74 is preferably about 3 μm or more and 14 μm or less. Moreover, when using the slurry which contained the abrasive | polishing agent 74 in the pure water by the wet blast method, it is preferable that content of the abrasive | polishing agent 74 in a slurry shall be about 5 volume% or more and 30 volume% or less.
Further, the abrasive 74 is preferably higher in hardness than the base material 51 and the base material 41 to be removed by blast processing, for example, alumina (Al ₂ O ₃ ), silicon carbide (SiC), stainless steel, zirconia ( ZrO ₂ ), glass and the like.

In addition, the projection angle 73a of the slurry containing the abrasive 74 is preferably 15 ° or more and 45 ° or less, and close to 30 ° with respect to the upper surface 5a and the upper surface 4a that are the processing target surfaces. More preferred.
When the abrasive 74 is projected at a projection angle 73a close to perpendicular (90 °) to the processing target surface, the abrasive 74 pierces the base material 41 and the base material 51 and remains in the package 2 after the blast processing. It becomes easy. Further, when the abrasive 74 is projected at a projection angle 73a that is nearly horizontal, the efficiency of removing the base material 41 and the base material 51 by the abrasive 74 may be reduced. Therefore, the base material 51 and the base material 41 can be efficiently removed by setting the projection angle 73a within the above-described range.

  In the wet blast method, the slurry is sprayed from the nozzle 73 of the spray gun together with the compressed air toward the processing target surface. The pressure of the compressed air (gun pressure of the injection gun) at this time has an optimum value depending on the shape of the nozzle 73, the projection angle 73a, the material and shape of the abrasive 74, the particle size, and the like. About 5 MPa.

Further, when the abrasive 74 is projected from only one direction D1 in plan view at the projection angle 73a, the base material 51 on one side (left side in FIG. 6A) of the first filler 52 is removed, and the base on the opposite side is removed. The material 51 tends to remain. For this reason, after projecting the abrasive 74 from the direction D1, it is preferable to change the direction of the nozzle 73 and project the abrasive 74 from the opposite direction (right side in FIG. 6B).
Furthermore, you may make it project the abrasive | polishing agent 74 also from direction D3, D4 orthogonal to direction D1, D2 by planar view. Further, for example, the abrasive 74 may be projected from three directions different from each other by 120 ° in a plan view.
When the abrasive 74 is projected from a plurality of directions, the processing is performed in one direction on the entire upper surface 5a and the upper surface 4a, and then the direction of the nozzle 73 is sequentially changed. In addition, the direction of the nozzle 73 may be changed relative to the light emitting device 100, and the direction of the light emitting device 100 may be changed while the nozzle 73 is fixed.

The upper surface 5a of the translucent member 5 has been described above. However, the upper surface 4a of the light-shielding member 4 is also formed on the upper surface 4a of the light-shielding member 4 by uniformly blasting the entire upper surface of the light emitting device 100. The base material 41 is removed from the surface.
As described above, the light emitting device 100 is manufactured by performing each process.

<Application example>
[Configuration of image display device]
Next, as an application example of the light emitting device 100 according to the first embodiment, an image display device using the light emitting device 100 will be described with reference to FIGS. 7A and 7B.
FIG. 7A is a perspective view illustrating a configuration of an image display device using the light emitting device according to the first embodiment. FIG. 7B is an exploded perspective view illustrating a configuration of an image display device using the light emitting device according to the first embodiment.

  The image display device 200 includes a circuit board 210, a plurality of light emitting devices 100 mounted on the upper surface of the circuit board 210, a protection member 220 that covers the electrodes and wiring portions of the light emitting device 100 and the circuit board 210, and a plurality of light emitting devices. And a frame member 230 provided so as to cover the space between the light emitting devices 100. The image display device 200 uses one light emitting device 100 as one pixel.

  In the image display device 200, nine light emitting devices 100 are mounted on the circuit board 210 in a 3 × 3 matrix, but more light emitting devices 100 may be mounted. Further, for example, by using the circuit board 210 on which the 3 × 3 light emitting device 100 is mounted as one unit and arranging a plurality of units, an image display device having a larger number of pixels may be configured. Good.

  The circuit board 210 is a board for mechanically holding and electrically connecting the plurality of light emitting devices 100. The circuit board 210 is formed in a rectangular flat plate shape. In addition, the circuit board 210 can be specifically configured by a board made of glass epoxy or the like on which a drive control circuit or a communication circuit for driving the light emitting device 100 is mounted.

  The protection member 220 prevents moisture such as rainwater or moisture in the outside air from entering the light emitting device 100. The protective member 220 can be made of a waterproof material such as a silicone resin, and is formed on the circuit board 210 so as to cover the side surface of the light emitting device 100.

The frame member 230 is a member for protecting the circuit board 210 and the protection member 220 on the circuit board 210. The frame member 230 is formed in a rectangular flat plate shape, and has substantially the same area as the circuit board 210. Further, the same number of openings 230 a corresponding to the areas of the individual light emitting devices 100 are formed in the frame member 230. The frame member 230 is disposed such that the upper surface of the light emitting device 100 is exposed from the opening 230a, and is joined to the circuit board 210 by a screw member or the like.
In addition, the frame member 230 can be formed using metal, resin, ceramics, or the like, but it is preferable that the upper surface is roughened so that regular reflection of external light is suppressed.

  As described above, the light emitting device 100 is provided with a plurality of protrusions on the upper surface side, thereby reducing the regular reflection light component of the external light. For this reason, the image display device 200 using the light emitting device 100 as a pixel can reduce the influence of external light and can recognize the brightness and color of the pixel well regardless of the observation direction.

Second Embodiment
[Configuration of light emitting device]
Next, a light emitting device according to a second embodiment will be described with reference to FIGS. 8A to 8C.
FIG. 8A is a perspective view showing a configuration of a light emitting device according to the second embodiment. FIG. 8B is a plan view showing the configuration of the light emitting device according to the second embodiment. FIG. 8C is a cross-sectional view showing the configuration of the light emitting device according to the second embodiment, and shows a cross section taken along line VIIIC-VIIIC in FIG. 8B.
In FIG. 8C, two types of first fillers are indicated by circles and diamonds, the second filler is indicated by circles, and the wavelength converting substance is indicated by pentagons. These shapes do not indicate the specific shapes of the corresponding members, but are used for the sake of convenience to distinguish the type of filler particles.

The light emitting device 100A according to the second embodiment has a rectangular shape in plan view, a package 2A having a recess 2Aa that opens on the upper surface side, a light emitting element 1 mounted in the recess 2Aa, and a recess 2Aa. And a translucent member 5A for sealing the light emitting element 1. The package 2A includes a lead electrode 3A and a light shielding member 4A, and the light emitting element 1 is electrically connected to the lead electrode 3A provided on the bottom surface of the recess 2Aa using a wire 6. In the light emitting device 100A, the protective element 8 is mounted in the recess 2Aa.
The protection element 8 is, for example, a Zener diode, and is an element that protects the light emitting element 1 from destruction due to electrostatic discharge.

  A light emitting device 100A according to the second embodiment includes a package 2A having a different external shape from the package 2 of the light emitting device 100 according to the first embodiment. Further, in the light emitting device 100A, the number of the light emitting elements 1 mounted is one, the protective element 8 is mounted, and the first filler 52 (52a, 52b) is added to the translucent member 5A. In addition to the light emitting device 100, the particles of the wavelength converting substance 53 are contained.

The package 2A is composed of a lead electrode 3A and a light-shielding member 4A, and has a substantially rectangular outer shape in plan view, and is provided with a recess 2Aa having an opening on the upper surface side. The recess 2Aa is a region for mounting the light emitting element 1, and the bottom surface 2Ab of the recess 2Aa is composed of a lead electrode 3A and a light shielding member 4A. Further, the side wall of the recess 2Aa is constituted by a light shielding member 4A.
Further, the lower surface of the package 2A is a flat surface and is provided so that the lead electrodes 31A and 32A are exposed, and the lower surface is a mounting surface of the light emitting device 100A.

The lead electrode 3A includes a flat lead electrode 31A and a lead electrode 32A, and is provided at the bottom of the package 2A so as to be separated from each other. The lead electrodes 31A and 32A are provided with a step at the outer peripheral end so that the lower surface side is recessed, and are configured to be difficult to peel off from the light shielding member 4A.
In the lead electrodes 31A and 32A, a part of the upper surface constitutes the bottom surface 2Ab of the recess 2Aa, the light emitting element 1 is die-bonded on the lead electrode 31A, and the protective element 8 is die-bonded on the lead electrode 32A. Yes. In addition, the light emitting element 1 is electrically connected to the lead electrodes 31 </ b> A and 32 </ b> A via wires 6. The protective element 8 is electrically connected to the lead electrode 32A by die-bonding one electrode provided on the lower surface side, and the other electrode provided on the upper surface side via the wire 6 to the lead electrode 31A. And are electrically connected.

  The light shielding member 4A can be formed using the same material as the light shielding member 4 in the first embodiment, and a part of the particles of the second filler 42 is exposed on the upper surface 4Aa.

The translucent member 5A is provided in the recess 2Aa and seals the light emitting element 1 and the protection element 8. The translucent member 5 </ b> A contains particles of the wavelength conversion material 53 in addition to the first filler 52 (52 a, 52 b) in the base material 51. In the translucent member 5 </ b> A, some of the particles of the first filler 52 are exposed from the base material 51 on the upper surface 5 </ b> Aa. The wavelength converting substance 53 is mainly disposed around the light emitting element 1 and in the vicinity of the bottom surface 2Ab of the recess 2Aa so as not to be exposed from the top surface 5Aa.
In addition, the base material 51 and the 1st filler 52 can use the material similar to the translucent member 5 in 1st Embodiment.

The wavelength converting substance 53 is a phosphor that absorbs part or all of the light from the light emitting element 1 and converts the wavelength by emitting light of different wavelengths.
For example, white light can be generated by combining the light-emitting element 1 that emits blue light and the wavelength conversion material 53 that absorbs blue light and emits yellow light. The wavelength converting material 53 is not limited to one type, and a plurality of types having different emission colors may be used.

As the wavelength converting substance 53, a substance that absorbs light from the light emitting element 1 and converts the wavelength can be used. The wavelength converting substance 53 preferably has a higher specific gravity than the base material 51 of the uncured translucent member 5A at the time of manufacture. If the specific gravity of the wavelength converting material 53 is greater than that of the uncured base material 51, the particles of the wavelength converting material 53 are precipitated when forming the translucent member 5A at the time of manufacture, and the light emitting element 1 and the lead electrode 31A. , 32A near the surface.
By arranging the wavelength converting material 53 in the vicinity of the surface of the light emitting element 1 or the lead electrodes 31A and 32A, the efficiency of wavelength conversion can be increased. In addition, by disposing the wavelength converting substance 53 so as not to be exposed from the upper surface 5Aa, it is possible to suppress deterioration and alteration of the wavelength converting substance 53 due to contact with the outside air.

Specifically, as the wavelength converting substance 53, for example, a YAG phosphor represented by Y ₃ Al ₅ O ₁₂ : Ce, a yellow phosphor such as silicate, or a CASN phosphor represented by CaAlSiN ₃ : Eu And red phosphor such as KSF phosphor represented by K ₂ SiF ₆ : Mn.

[Operation of light emitting device]
In the light emitting device 100A, a part or all of the light from the light emitting element 1 is wavelength-converted by the wavelength conversion material 53 and extracted from the upper surface 5Aa of the translucent member 5A that is a light extraction surface.
In addition, it is possible that at least part of the external light irradiated on the upper surface of the light emitting device 100A is diffusely reflected by the plurality of protrusions provided on the upper surface 5Aa and the upper surface 4Aa, thereby reducing surface “shine”. This is the same as in the first embodiment. Further, the light extraction efficiency is improved by exposing a part of the first filler 52 from the upper surface 5Aa of the translucent member 5A, as in the first embodiment.

[Method for Manufacturing Light Emitting Device]
Next, a method for manufacturing a light emitting device according to the second embodiment will be described with reference to FIGS. 8A to 8C and FIG.
FIG. 9 is a flowchart showing the procedure of the method for manufacturing the light emitting device according to the second embodiment.

  The manufacturing method of the light emitting device 100A according to the second embodiment includes a package preparation step S21, a light emitting element mounting step S22, a translucent member forming step S23, and a blast processing step S24. Moreover, translucent member formation process S23 contains resin supply process S231, wavelength conversion substance sedimentation process S232, and resin hardening process S233.

The package preparation step S21 is a step of preparing the package 2A. Although the shape of the package to be prepared is different, the package 2A can be prepared by the same method as the package preparation step S11 in the first embodiment.
In the package 2A prepared in this step, the second filler 42 arranged in the vicinity of the upper surface 4Aa of the light shielding member 4A is covered with the base material 41.

The light emitting element mounting step S22 is a process of mounting the light emitting element 1 in the recess 2Aa of the package 2A. The light emitting element 1 can be performed by the same method as the light emitting element mounting step S12 in the first embodiment.
In this step, the protective element 8 is also mounted in the recess 2Aa.

  The translucent member forming step S23 is a step of forming the translucent member 5A in the recess 2Aa. As described above, the translucent member forming step S23 includes the resin supply step S231, the wavelength conversion substance sedimentation step S232, and the resin curing step S233. Yes.

  Resin supply process S231 can be performed by the method similar to resin supply process S131 in 1st Embodiment. The resin material supplied into the recess 2 </ b> Aa is prepared such that the uncured base material 51 contains the first filler 52 and the wavelength conversion substance 53. Further, it is preferable that the wavelength conversion material 53 and the base material 51 are selected so that the wavelength conversion material 53 has a specific gravity greater than that of the uncured base material 51.

  The wavelength converting substance sedimentation step S232 is a step of precipitating the wavelength converting substance 53 contained in the resin material after supplying the uncured resin material into the recess 2Aa in the resin supplying step S231. Specifically, this is a step in which the wavelength converting material 53 having a specific gravity larger than that of the uncured base material 51 is allowed to settle by gravity and is left in the vicinity of the surface of the light emitting element 1 or the lead electrodes 311 and 32A.

  Since resin hardening process S233 can be performed similarly to resin hardening process S132 in 1st Embodiment, description is abbreviate | omitted.

Since the blast processing step S24 can be performed in the same manner as the blast processing step S14 in the first embodiment, the description thereof is omitted.
In the case where the wavelength conversion substance 53 is not allowed to settle, the resin curing step S233 is performed immediately after the resin supply step S231.
100A of light-emitting devices can be manufactured by performing the above process.

Next, examples of the present invention will be described.
The light emitting device having the form shown in FIG. 1A and the light emitting device having the form shown in FIG. 8A were each manufactured by the manufacturing method described above. At this time, a plurality of samples were produced by changing the conditions of the blast processing.

(Shape and Material of Light Emitting Device: Sample of First Embodiment)
・ Translucent member:
Base material: Epoxy resin (refractive index 1.53)
First filler: Silica (SiO ₂ ) (refractive index 1.46, particle size 1.5 μm, content 40% by mass)
-Light shielding member (light absorbing member):
Base material: Polyphthalamide resin Second filler: Carbon black (particle size 3 μm, content 1% by mass)
·package:
External dimensions in plan view: 3 mm on each side
Opening diameter of translucent member: 2.6 mm on one side
・ Light emitting element: One blue LED, one green LED, and one red LED

(Shape and material of light emitting device: sample of the second embodiment)
・ Translucent member:
Base material: Silicone resin (refractive index 1.52)
First filling member: silica (SiO ₂ ) (refractive index 1.46, particle size 6 μm, content 15% by mass)
Wavelength converting material: YAG phosphor / light shielding member (light reflecting member):
Base material: Epoxy resin Second filler: TiO ₂ (particle size 0.3 μm, content 17% by mass)
·package:
External dimensions in plan view: long side 3 mm, short side 1.4 mm
Opening diameter of translucent member: long side 2.6 mm, short side 1.0 mm
・ Light emitting element: One blue LED mounted

(Blasting processing conditions: common to samples of each embodiment)
・ Polishing liquid (slurry):
Solvent: Pure water Abrasive: Alumina (Al ₂ O ₃ ) (particle size 3 μm (D50), content 5% by volume)
・ Projection angle: 30 ° / 90 °
・ Projection direction: 1 direction / 2 directions / 4 directions ・ Gun pressure: 0.2 / 0.3 / 0.4 (MPa)
Processing speed: 40 mm / second Under the above conditions, air pressure was applied and the polishing liquid was sprayed from the nozzle in the form of a mist, whereby the upper surface of the sample of the light emitting device was subjected to blast processing.

(Evaluation)
For each sample produced by changing the conditions of the blasting treatment, the light output, the antireflection effect on the upper surface, the surface roughness of the upper surface, and the filler (first filler) when the sample not subjected to the blasting treatment is used as a reference And the presence or absence of dropping of the second filler).
It was confirmed that the sample subjected to the blasting treatment under any condition exposed the filler on the processed surface.
As the gun pressure increased, the amount of exposed filler increased, and in some samples, the filler was removed from the surface. However, under the same conditions, the higher the gun pressure, the higher the light output (luminous flux). It was confirmed. The improvement of the light output is 1 to 2.9% for each sample of the first embodiment, and 0.3 to 0.9% for each sample of the second embodiment.

When the projection angle was 90 °, that is, when the abrasive was projected perpendicularly to the processed surface, the amount of exposed filler was less than when the projection angle was 30 ° when compared with the same gun pressure.
In addition, when the projection angle is 30 °, when projecting from one direction, the filler surface facing the projection direction is exposed, but the opposite surface is behind the filler itself, so It was not exposed. By setting the projection direction to two directions, and further to four directions, the exposure amount of the filler increased, and the exposure amount increased more than when the projection angle was 90 °. It is considered that the abrasive becomes easier to remove the resin by making the projection angle smaller than vertical. The light output of the sample when the projection angle is 90 ° and the gun pressure is 0.4 MPa is the same as the sample when the projection angle is 30 °, the gun pressure is 0.2 MPa, and the projection direction is four directions. It was confirmed that it improved.

Moreover, it was confirmed visually that each sample has an antireflection effect of external light as compared with the sample not subjected to the blast processing.
In each sample, the surface roughness (arithmetic average roughness Ra) of the upper surface was substantially the same as that of the sample not subjected to blast processing. That is, it was confirmed that only the resin covering the surface of the filler was removed without damaging the main body of the translucent member, which is a resin member, with large unevenness by the blast processing.

[Form 1]
A base, a light-emitting element mounted on the base, and a translucent member that covers the light-emitting element, and the translucent member and the base each have a plurality of protrusions on an upper surface thereof. The translucent member contains particles of the first translucent filler having a lower refractive index than the base material of the translucent member, and some of the particles of the first filler are The light-emitting device exposed from the base material of the translucent member on the upper surface of the translucent member.
[Form 2]
The light emitting device according to aspect 1, wherein the base includes a lead electrode and a light-shielding member that fixes the lead electrode.
[Form 3]
The said base comprises the recessed part which has an opening in an upper surface, The said light emitting element is mounted in the said recessed part, The said protrusion is formed in the upper surface of the side wall surrounding the said recessed part, The form 1 or form 2 Light-emitting device.
[Form 4]
The light-emitting device according to any one of Forms 1 to 3, wherein a difference in refractive index between the first filler and the base material of the translucent member is 0.03 or more.
[Form 5]
The light-emitting device according to any one of Embodiments 1 to 4, wherein the light-transmitting member and the light-shielding member use a light-transmitting resin as a base material.
[Form 6]
The light emitting device according to any one of Forms 1 to 5, wherein the protrusions provided on the upper surface of the translucent member are caused by particles of the first filler.
[Form 7]
The first filler may be an air permeation method or Fisher-SubSeve-Sizers-No. 7. The light-emitting device according to aspect 6, wherein the particle size defined by is from 0.5 μm to 10 μm.
[Form 8]
The light emitting device according to any one of Embodiments 1 to 7, wherein an arithmetic average roughness Ra defined by JIS standard B0601: 2013 is 0.095 μm or more and 0.220 μm or less on the upper surface of the translucent member. .
[Form 9]
The light emitting device according to any one of Forms 1 to 8, wherein the first filler is SiO ₂ .
[Mode 10]
The light emitting device according to any one of Forms 1 to 9, wherein a base material of the translucent member is made of a material selected from an epoxy resin and a silicone resin.
[Form 11]
The light-shielding member contains a second filler particle in a resin base material, and a part of the second filler particle is exposed from the base material of the light-shielding member on an upper surface of the light-shielding member. The light emitting device according to any one of Forms 1 to 10, wherein the protrusion provided on the upper surface of the light shielding member is caused by particles of the second filler.
[Form 12]
The translucent member further contains particles of a wavelength converting substance that converts light from the light emitting element into light of a different wavelength,
The light-emitting device according to any one of Forms 1 to 11, wherein the wavelength conversion substance particles are provided so as not to be exposed from a base material of the translucent member.
[Form 13]
A light-emitting device manufacturing method comprising: a base; a light-emitting element placed on the base; and a translucent member that covers the light-emitting element, wherein the light-emitting element is placed on the base. And forming the light-transmitting member, comprising: forming the light-transmitting member that covers the light-emitting element; and performing a blasting process on the upper surfaces of the light-transmitting member and the base. In the step, the translucent member is formed using a translucent resin as a base material and a resin material containing particles of a translucent first filler having a lower refractive index than the base material. A method of manufacturing a light emitting device, wherein a part of the particles of the first filler is exposed from a base material of the light transmissive member on an upper surface of the light transmissive member by performing the blasting process.
[Form 14]
The light emitting device manufacturing method according to mode 13, wherein the base includes a lead electrode and a light-shielding member that fixes the lead electrode.
[Form 15]
The light emitting device manufacturing method according to the thirteenth or fourteenth aspect, wherein the base has a concave portion having an opening on an upper surface, and the light emitting element is placed in the concave portion.
[Form 16]
The particles of the first filler may be air permeation or Fisher-SubSieve-Sizers-No. The method for manufacturing a light-emitting device according to any one of Embodiments 13 to 15, wherein the particle size defined by the above is 0.5 μm or more and 10 μm or less.
[Form 17]
The light-emitting device manufacturing method according to any one of Forms 13 to 16, wherein the blasting process is a wet blasting process in which a slurry containing water and an abrasive is projected.
[Form 18]
The light-emitting device manufacturing method according to a seventeenth aspect, wherein the blasting treatment projects the slurry at an angle of 15 ° or more and 45 ° or less with respect to the upper surface of the translucent member.
[Form 19]
19. The method for manufacturing a light emitting device according to claim 18, wherein the blast processing is performed by sequentially projecting the slurry from two or more different directions in plan view.
[Form 20]
The light-shielding member is formed using a resin as a base material, and using a resin material in which particles of the second filler are dispersed in the base material.
The light emitting device according to any one of Embodiments 13 to 19, wherein a part of the particles of the second filler is exposed from the base material of the light shielding member on the upper surface of the light shielding member by the blasting treatment. Manufacturing method.
[Form 21]
In addition to the particles of the first filler, the translucent member further contains, in the base material of the translucent member, particles of a wavelength conversion substance that converts light from the light emitting element into light of a different wavelength. Formed using resin material,
In the step of forming the translucent member, the uncured resin material containing the first filler particles and the wavelength converting substance particles is supplied into the recess, and the wavelength converting substance particles settle. The manufacturing method of the light-emitting device according to any one of Forms 13 to 20, wherein the resin material is cured after the process.

  A light emitting device according to an embodiment of the present disclosure is used in a backlight light source of a liquid crystal display, various lighting fixtures, a large display, various display devices such as an advertisement and a destination guide, and further in a digital video camera, a facsimile, a copier, a scanner, and the like. It can be used for an image reading device, a projector device, and the like.

1 Light-Emitting Element 11, 12, 13 Light-Emitting Element 2, 2A Package (Base)
2a, 2Aa Recess 2b, 2Ab Bottom surface 3, 3A Lead electrodes 31, 32, 33, 34 Lead electrodes 31A, 32A Lead electrodes 4, 4A Light-shielding members 4a, 4Aa Top surface 4b Notch portion 41 Base material 42 Second filler 5 , 5A Translucent member 5a, 5Aa Upper surface 51 Base material 52, 52a, 52b First filler 53 Wavelength converting substance 6 Wire 71 Dispenser 72 Heating device 73 Nozzle 73a Projection angle 74 Abrasive agent 100 Light emitting device 200 Image display device 210 Circuit Substrate 220 Protection member 230 Frame member 230a Opening

Claims (21)

The base,
A light emitting device mounted on the base;
A translucent member covering the light emitting element,
The translucent member and the base have a plurality of protrusions on their upper surfaces,
The translucent member contains particles of a translucent first filler having a refractive index lower than that of the base material of the translucent member,
The light emitting device in which a part of the particles of the first filler is exposed from a base material of the light transmissive member on an upper surface of the light transmissive member.   The light emitting device according to claim 1, wherein the base includes a lead electrode and a light shielding member that fixes the lead electrode. The base comprises a recess having an opening on the upper surface,
The light emitting element is placed in the recess,
The light emitting device according to claim 1, wherein the protrusion is formed on an upper surface of a side wall surrounding the recess.   4. The light-emitting device according to claim 1, wherein a difference in refractive index between the first filler and a base material of the translucent member is 0.03 or more.   The light-emitting device according to any one of claims 1 to 4, wherein the light-transmitting member and the light-shielding member use a light-transmitting resin as a base material.   The light emitting device according to claim 1, wherein the protrusion provided on the upper surface of the translucent member is caused by particles of the first filler.   The first filler may be an air permeation method or Fisher-SubSeve-Sizers-No. The light-emitting device according to claim 6, wherein the particle size defined by is from 0.5 μm to 10 μm.   The arithmetic mean roughness Ra prescribed | regulated by JIS standard B0601: 2013 is 0.095 micrometer or more and 0.220 micrometer or less, and the upper surface of the said translucent member is described in any one of Claims 1 thru | or 7. Light emitting device. The light emitting device according to claim 1, wherein the first filler is SiO ₂ .   The light emitting device according to any one of claims 1 to 9, wherein a base material of the translucent member is made of a material selected from an epoxy resin and a silicone resin.   The light-shielding member contains a second filler particle in a resin base material, and a part of the second filler particle is exposed from the base material of the light-shielding member on an upper surface of the light-shielding member. The light emitting device according to claim 1, wherein the protrusion provided on the upper surface of the light shielding member is caused by particles of the second filler. The translucent member further contains particles of a wavelength converting substance that converts light from the light emitting element into light of a different wavelength,
The light emitting device according to any one of claims 1 to 11, wherein the wavelength conversion substance particles are provided so as not to be exposed from a base material of the translucent member. A light emitting device comprising: a base; a light emitting element placed on the base; and a translucent member that covers the light emitting element.
Forming the translucent member covering the light emitting element after the light emitting element is placed on the base; and
Blasting the upper surface of each of the translucent member and the base, and
In the step of forming the translucent member, the translucent member uses a translucent resin as a base material, and contains particles of a translucent first filler having a lower refractive index than the base material. Formed using resin material,
A method for manufacturing a light-emitting device, wherein a part of the particles of the first filler is exposed from a base material of the translucent member on the upper surface of the translucent member by performing the blasting process.   The light emitting device manufacturing method according to claim 13, wherein the base includes a lead electrode and a light-shielding member that fixes the lead electrode.   The method of manufacturing a light emitting device according to claim 13 or 14, wherein the base has a concave portion having an opening on an upper surface, and the light emitting element is placed in the concave portion.   The particles of the first filler may be air permeation or Fisher-SubSieve-Sizers-No. The method for manufacturing a light-emitting device according to claim 13, wherein the particle size defined by is from 0.5 μm to 10 μm.   The method for manufacturing a light emitting device according to any one of claims 13 to 16, wherein the blasting process is a wet blasting process in which a slurry containing water and an abrasive is projected.   The light emitting device manufacturing method according to claim 17, wherein in the blast processing, the slurry is projected at an angle of 15 ° or more and 45 ° or less with respect to an upper surface of the translucent member.   The method of manufacturing a light emitting device according to claim 18, wherein the blasting process sequentially projects the slurry from two or more different directions in plan view. The light-shielding member is formed using a resin as a base material, and using a resin material in which particles of the second filler are dispersed in the base material.
20. The method according to claim 13, wherein a part of the particles of the second filler is exposed from the base material of the light shielding member on the upper surface of the light shielding member by the blasting treatment. Manufacturing method of light-emitting device. In addition to the particles of the first filler, the translucent member further contains, in the base material of the translucent member, particles of a wavelength conversion substance that converts light from the light emitting element into light of a different wavelength. Formed using resin material,
In the step of forming the translucent member, the uncured resin material containing the first filler particles and the wavelength converting substance particles is supplied into the recess, and the wavelength converting substance particles settle. 21. The method for manufacturing a light emitting device according to claim 13, wherein the resin material is cured after the curing.

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