JPH1084137A - Light emitting device and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light emitting device which can increase its light utilization efficiency and light coupling efficiency with an optical fiber, by collecting forward light emitted therefrom. SOLUTION: A resin molded part 15 has a double structure of an inner sealing member 16 and an outer sealing member 17. The inner sealing member 16 is made of transparent resin material having a relatively large refractive index, and is shaped to, e.g. a truncated cone. The outer sealing member 17 is made of transparent or semi-transparent resin material having a relatively small refractive index. Such a light emitting element 13 as an LED is sealed on a side of the inner sealing member 16 having a small area, while an end face of a side of the inner sealing member 16 having a large area is exposed from the outer sealing member 17.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a light emitting device and a method for manufacturing the same. In particular, the present invention relates to a light emitting device in which a light emitting element such as an LED chip is resin-molded, and a method for manufacturing the same.

[0002]

2. Description of the Related Art FIG. 1 is a sectional view showing a structure of a light emitting device A conventionally used. This light emitting device A
Has two leads 1a and 1b. A reflector 2 having a concave spherical shape is formed at the tip of one lead 1a, and a light emitting element 3 such as an LED (light emitting diode) is mounted on the reflector 2 by die bonding. The light emitting element 3 and the other lead 1b are wire-bonded by the Au wire 4. In order to protect the light emitting element 3 and the Au wire 4, the light emitting device A is packaged by being sealed with one kind of transparent sealing member (epoxy resin) 5.

When the light emitting element 3 emits light, the light emitted forward from the light emitting element 3 is extracted from the front surface of the sealing member 5 to the outside. In addition, the light emitted from the light emitting element 3 toward the back and side is reflected forward by the reflector 2, thereby increasing the front luminance of the light emitting device A.

[0004]

However, in the light emitting device A as shown in FIG. 1, since the reflector 2 is relatively small, only a part of the light is directed to the front, and the light is not sealed. There is also light that is totally reflected on the surface of the stop member 5 and travels in the back direction or the side direction, and the light emitted from the light emitting element 3 is emitted from the entire surface of the transparent sealing member 5. For this reason, when trying to use light emitted from one direction of the light emitting device A, light emitted in another direction cannot be used, and the light use efficiency is poor.

In particular, when the light emitting device A is coupled with the plastic optical fiber 6, as shown in FIG.
(Only the core is shown in FIG. 2). The light is emitted to a region outside the core diameter and does not couple with the optical fiber 6, so that the optical coupling efficiency is low, and the coupling efficiency between the light emitting device A and the optical fiber 6 is low. A few percent. For example, in the case of the optical fiber 6 having a core diameter of 1 mm, the optical coupling efficiency was only about 6.5%.

In order to improve the light use efficiency, there is a method in which a metal vapor-deposited film is provided on the outer peripheral surface or the rear surface of the sealing member, and light emitted to the side direction or the rear surface is reflected by the metal vapor-deposited film. However, since the metal deposition film is vulnerable to moisture, it is necessary to cover and cover the metal deposition film with a moisture-impermeable protective film so as not to be exposed. Further, it is necessary to electrically insulate the metal deposition film from the leads and the like. For this reason, there has been a problem that the structure of the light emitting device becomes complicated and manufacturing becomes difficult.

In order to improve the coupling efficiency with the optical fiber, the distance between the light emitting element 3 and the end face of the optical fiber 6 may be shortened, as can be seen from FIG. However, for this purpose, it is necessary to shorten the distance from the light emitting element 3 to the light emitting surface (front surface) of the sealing member 5, so that moisture easily reaches the light emitting element 3 from the front surface of the sealing member 5, The deterioration speed of the light emitting device increases. Therefore, it was practically difficult to shorten the distance from the light emitting element to the front surface of the sealing member.

Further, when an optical fiber and a light emitting device are combined and used, if there is a variation in the position of the light emitting element in the sealing member in the manufacturing process of the light emitting device, etc., the center of the light emitting device (sealing member) and the light Even if the optical axis of the fiber is aligned, the light emitting element and the optical axis of the optical fiber do not match, which causes a reduction in optical coupling efficiency.

The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has as its object to improve the light use efficiency of a light emitting device and to couple a light emitting device to an optical fiber. In such a case, the object is to improve the optical coupling efficiency.

[0010]

The light emitting device according to claim 1, wherein the light emitting element is sealed in a transparent or translucent package and light emitted from the light emitting element is taken out of the package. A sealing member made of a transparent sealing member made of a refractive index material and a transparent or translucent sealing member made of a low refractive index material, and a sealing member made of the low refractive index material outside a sealing member made of the high refractive index material. It is characterized in that a stop member is formed.

In the light emitting device according to the first aspect, since the sealing member made of the low refractive index material is formed outside the sealing member made of the high refractive index material, the light emitting device is made of the high refractive index material. The direction in which light travels can be changed by totally reflecting light from the sealing member toward the boundary surface between the two sealing members. Therefore, by devising the shape of the boundary surface between the sealing member made of the high-refractive-index material and the sealing member made of the low-refractive-index material, light emitted from the light emitting element and reflected at the boundary surface can be collected in one direction. Can be. Accordingly, the amount of light emitted from the light emitting device in one direction can be increased, and most of the light can be extracted from the surface of the light emitting device in one direction, thereby improving the light use efficiency. Can be.

According to a second aspect of the present invention, in the light emitting device, the light emitting element is sealed in a transparent or translucent package, and the light emitted from the light emitting element is taken out of the package. A light-emitting element comprising a transparent sealing member made of a material and a transparent or translucent sealing member made of a low-refractive-index material; It is characterized in that the light is totally reflected at the interface with the sealing member made of a refractive index material and is taken out of the package.

In the light emitting device according to the second aspect, since the sealing member is composed of the sealing member made of the high refractive index material and the low refractive index material, the sealing made of the high refractive index material is used. The direction in which light travels can be changed by totally reflecting light at the interface between the member and the sealing member made of a low refractive index material. Therefore, by devising the shape of the boundary surface between the sealing member made of the high-refractive-index material and the sealing member made of the low-refractive-index material, light emitted from the light emitting element and reflected at the boundary surface can be collected in one direction. Can be. Accordingly, the amount of light emitted from the light emitting device in one direction can be increased, and most of the light can be extracted from the surface of the light emitting device in one direction, thereby improving the light use efficiency. Can be.

Further, in the light emitting device according to the first and second aspects, the efficiency of light utilization is improved to increase the amount of light emitted from the light emitting device in one direction.
By coupling the light emitting device and the optical fiber in this direction, the coupling efficiency between the light emitting device and the optical fiber can be improved.

Further, according to the light emitting device according to the first and second aspects, the sealing member made of resin or the like is at least two-sided.
Due to the heavy structure, the structure is strong against moisture.
Therefore, the durability against humidity is not deteriorated unlike the method using a metal deposition film or the method of shortening the distance between the light emitting element and the front surface of the sealing member.

Further, according to the light emitting device of the first and second aspects, even if the mounting position of the light emitting element varies, the optical coupling efficiency between the light emitting element and the optical fiber does not vary.

According to a third aspect of the present invention, there is provided a method for manufacturing a light emitting device according to the first aspect, wherein the sealing member is formed of a low refractive index material in advance. Disposing a light-emitting element in the hollow interior, injecting a transparent high-refractive-index material into the hollow interior of the sealing member made of the low-refractive-index material; Forming a sealing member made of a material and sealing the light emitting element in a sealing member made of a high refractive index material.

According to the method for manufacturing a light emitting device according to the third aspect, there is little possibility that extra vibration, external force, or molding pressure is applied to the light emitting element in the manufacturing process of the light emitting device. The yield can be improved, and a highly reliable light-emitting device can be obtained.

[0019]

3 (a) and 3 (b) are a sectional view and a front view showing a light emitting device B according to an embodiment of the present invention. In this light emitting device B, a dish-shaped reflector 12 is formed at the tip of one of the plate-shaped leads 11a, and an LED (light emitting diode) chip or an LD (semiconductor laser) is formed on the inner surface of the reflector 12. A light emitting element 13 such as a chip is die-bonded, and the light emitting element 13 and the other lead 11b are connected by a bonding wire 14 such as an Au wire. The light emitting element 13 and the leads 11a,
11b is a resin mold portion 15 having a frustum shape at the tip end and the like.
(The package), and the light emitting element 13 and the bonding wire 14 are protected by the resin mold portion 15.

The resin mold portion 15 has a double structure, and a transparent resin material having a high refractive index (epoxy resin,
A sealing member (hereinafter, referred to as a polycarbonate resin)
The outside sealing member 16 is formed of a transparent or translucent resin material (methacrylic resin, silicon resin, fluororesin, etc.) having a low refractive index so as to wrap the inside sealing member 16. A member (hereinafter, referred to as an outer sealing member) 17 is formed. Inner sealing member 1
Numeral 6 has a frustum shape, and the light emitting element 13 is sealed on the central axis of the inner sealing member 16 in the vicinity of the end face on the small area side, and the end face on the large area side is the light emitting surface ( Front surface) and is exposed from the outer sealing member 17.

The outer sealing member 17 has a substantially frustum shape, a cylindrical shape, or a rectangular tube shape, and leads 11a and 11b extend from an end surface having a larger area. A flange 18 is formed, and the inner sealing member 16 is exposed at the end surface on the side with the smaller area. A notch 19 is provided in a part of the flange 18.
The frustum shape referred to for the inner sealing member 16 and the outer sealing member 17 is not limited to the truncated cone shape as shown in FIG. 3, but may be a truncated pyramid shape. Further, the shape is not limited to the geometrical frustum shape, and may be a shape deformed while substantially maintaining the frustum shape.

As shown in FIG. 3A, the light R emitted forward from the light emitting element 13 is
Is emitted from the front surface. Further, of the light R emitted from the light emitting element 13 in the lateral direction, the light R totally reflected at the boundary surface K between the inner sealing member 16 and the outer sealing member 17 is changed in the traveling direction toward the front. The light is emitted from the front surface of the inner sealing member 16 to the outside. Therefore, conventionally, the light R leaking from the side surface of the light emitting device B can be directed to the front surface of the light emitting device B, and the front surface (light emitting surface) of the light emitting device B
, The light use efficiency of the light emitting device B can be improved.

That is, as shown in FIG. 4, the refractive index of the inner sealing member 16 is n ₁ and the refractive index of the outer sealing member 17 is n _2.
Assuming that the inclination angle of the outer peripheral surface (boundary surface K) of the inner sealing member 16 is γ and the emission angle of light from the light emitting element 13 is θ, if θ ≦ γ + cos ⁻¹ (n ₂ / n ₁ ), The inner sealing member 1 emitted from the light emitting element 13
The light that has reached the boundary surface K between the inner sealing member 16 and the outer sealing member 17 is reflected by the boundary surface K between the two sealing members 16 and 17.
Is emitted from the front surface. Therefore, the amount of light emitted from the front surface of the light emitting device B increases by that much, and the light use efficiency increases.

As described above, since the light use efficiency of the light emitting device A is improved, the optical fiber 20 is disposed in front of the light emitting device B.
Can be increased so that the amount of light incident on the optical fiber 20 from the light emitting device B can be increased, and the optical coupling efficiency between the light emitting device B and the optical fiber 20 can be improved. In particular, as shown by an imaginary line in FIG. 3, the diameter of the open end of the inner sealing member 16 is equal to or smaller than the diameter of the optical fiber 20, and the end surface of the inner sealing member 16 is the end surface of the optical fiber 20. , Almost all of the light emitted from the light emitting device B can be guided to the optical fiber 20, and the optical coupling efficiency can be increased.

Further, the light emitting device B has a double structure of the inner sealing member 16 and the outer sealing member 17, so that the sealing property is improved. Therefore, the light emitting element 13 is hardly deteriorated by the invasion of moisture, and the environmental resistance and durability of the light emitting device B are improved.

Such a light emitting device B is used for a light emitting module for an optical fiber sensor, a photoelectric switch, a light transmitter for an electronic device, a light emitting module for an optical fiber communication, an indicator for an electronic device, and the like. A longer detection distance and longer transmission distance can be achieved, and a high SN ratio can be realized. When used as an indicator light, its visibility is also improved.

Further, when used in a light projecting device such as a photoelectric switch, there is no need for a light projecting lens for improving the directivity, and the cost can be reduced.

In the light emitting device B in which the inner sealing member 16 has a frustum shape, the light emitted from the light emitting element 13 is totally reflected by the boundary surface K between the sealing members 16 and 17. Since the light emission angle at the front surface of the light emitting device B can be reduced, the light emitting device B can have a small emission numerical aperture (NA).

Since the light emitting device of the present invention has the above-mentioned features, the light of the light emitting device B can be used efficiently, and the current injected into the light emitting element can be suppressed.
It is possible to extend the life of the light emitting device B, reduce power consumption, and reduce heat generation.

Further, since the sealing member has a multi-layer structure, light emitting devices of various shapes can be manufactured while maintaining the protection function of the light emitting element.

Next, a method of manufacturing the light emitting device B by molding will be described. First, the shape of the outer sealing member 17 will be described with reference to perspective views, plan views, and cross-sectional views of FIGS. 5A, 5B, and 5C. The outer sealing member 17 has, for example, a cylindrical or frusto-conical outer shape, and has a flange 18 at one end.
The flange 18 has a notch 1
9 are provided. A cylindrical hole 21 and a conical hole 22 are formed at the center of the outer sealing member 17 so as to be continuous, and a flat plate is formed from both side surfaces of the cylindrical hole 21 to some side surfaces of the conical hole 22. Are formed.

FIG. 6 is a sectional view showing the structure of a molding die for molding the outer sealing member 17.
And a lower mold 25. A cavity 26 for forming the outer shape of the outer sealing member 17 is formed in the lower mold 25, and a cylindrical hole 21 and a conical hole 22 for forming a cylindrical hole 21 and a conical hole 22 are formed in the center of the bottom surface in the cavity 26. A projection 27 is formed, and a gate port 28 for injecting a resin is provided on the outer peripheral surface, for example. A plate portion 29 for forming the flat recess 23 is formed on the lower surface of the upper mold 24.
When the upper mold 24 and the lower mold 25 are closed, the inner side surface of the plate portion 29 has a cylindrical hole 21 and a conical hole 22.
(A two-dot chain line in FIG. 6 shows the position of the plate portion 29 when the upper mold 24 is closed). Accordingly, a resin material such as methacrylic resin (PMMA) is injected under pressure into the cavity 26 from the gate port 28 with the upper mold 24 and the lower mold 25 closed, and then the upper mold 24 and the lower mold 25 are closed. The outer sealing member 17 is formed by opening and removing the mold.

The outer sealing member 17 can be injection-molded using methacrylic resin as described above.
As a molding resin material for molding the outer sealing member 17, it is ideal to cast a thermosetting resin having a relatively low refractive index.

FIG. 7A is a partially broken sectional view showing a molding die for molding the inner sealing member 16, and FIG.
Is a partially broken plan view of the lower mold. Lower mold 30
Is formed with a cavity 31 having the same shape as the outer shape of the outer sealing member 17, and a positioning portion 33 having a shape corresponding to the notch 19 of the outer sealing member 17 is provided in the flange forming portion 32 of the opening. ing. A gate port 34 for injecting a resin is provided on the bottom surface of the cavity 31. The upper dies 35, 35 are divided into two, and both upper dies 3
The concave portions 36, 36 for sandwiching the leads 11a, 11b are provided in the opposing portions of 5,5.

When the inner sealing member 16 is to be formed, as shown in FIG.
The outer sealing member 17 formed in advance is inserted into the inside 1 (usually, a large number of pieces are taken simultaneously by one mold, but only one is shown here). At this time, by aligning the notch 19 provided on the flange 18 of the outer sealing member 17 with the positioning portion 33 of the opening of the cavity 31, the direction of the outer sealing member 17 is determined, and the insertion direction of the leads 11a and 11b is changed. Determined in a certain direction. At this time, the gate port 34 faces the conical hole 22 of the outer sealing member 17. Next, after a pair of leads 11a and 11b on which the light emitting element 13 is mounted are inserted and positioned in the cylindrical hole 21 and the concave portion 23 of the outer sealing member 17, FIG.
As shown in the figure, the upper molds 35, 35 are placed on the upper surface of the lower mold 30 and closed, and the leads 11a, 11b are sandwiched and fixed between the concave notches 36, 36 of the upper molds 35, 35, and the upper mold is fixed. The cavity 31 is sealed by the molds 35, 35. In this state, the inner sealing member 16 is molded inside the outer sealing member 17 by injecting a resin material such as polycarbonate resin from the gate port 34, and the light emitting element 13 is sealed by the inner sealing member 16. The light emitting device B manufactured in this manner is taken out of the cavity 31 by opening the upper molds 35, 35, and the respective leads 11a, 11b are separated from the lead frame.

If the outer sealing member 17 is a methacrylic resin, the inner sealing member 16 can be formed by injection molding a polycarbonate resin as described above. If it is made of conductive resin,
Casting molding with an epoxy resin at a mold temperature of about 150 ° C. is also possible.

By manufacturing the light emitting device B as described above, the reliability of the light emitting device B having the two kinds of sealing members 16 and 17 can be improved. That is, unlike the method of the present invention, the light emitting element 13
Is sealed in the inner sealing member 16 and then the outer sealing member 17 is molded on the outside thereof. When the outer sealing member 17 is molded and contracted, a compressive stress is generated in the inner sealing member 16 and the inner light emitting element 13 Will put a great deal of stress on you. Further, the outer sealing member 17 is not formed by itself,
When the lead 7 is integrally formed with the leads 11a and 11b on which the light emitting element 13 is mounted, the light emitting element 13 at the tip of the lead 11a is held in a state of being suspended inside the outer sealing member 17, and thus the outer sealing is performed. During the handling of the member 17, the bonding wire 14 may come off. On the other hand, according to the method of the present invention, there is no fear that a large stress is applied to the light emitting element 13 or the bonding wire 14 comes off, so that the handling in the manufacturing process is simplified and the yield of the light emitting device B is improved. .

When the light emitting device B is manufactured as described above, the inner sealing member 16 is also provided inside the cylindrical hole 21.
Is filled, there is a possibility that light leaks from here, resulting in light loss. However, since this is behind the reflection plate 12,
There is little risk of light leaking.

(Second Embodiment) FIG. 10 is a sectional view showing a light emitting device C according to another embodiment of the present invention. In this light emitting device C, the inner sealing member 16 is formed in a columnar or prismatic shape (that is, it corresponds to the case where γ = 0 in the first embodiment). Also in this case, the light R emitted from the light emitting element 13 is totally reflected at the boundary surface K between the inner sealing member 16 and the outer sealing member 17 and does not spread to the outside without being spread outward.
Propagate inside. Therefore, by making the diameter of the inner sealing member 16 or the light emission opening of the light emitting device C smaller than the diameter of the optical fiber 20, the coupling efficiency with the optical fiber 20 and the light use efficiency can be improved. .

According to the simulation, the light coupling efficiency of the plastic optical fiber 20 having a core diameter of 1 mm was found to be 1% of the light coupling efficiency of the conventional light emitting device A according to the light emitting device C of the present invention. It was .92 times, and significant performance improvement was expected.

In the light emitting device of the present invention,
By adjusting the refractive indices n ₁ and n ₂ of the sealing members 16 and 17 so that the NA (numerical aperture) of the light emitting device becomes equal to the NA of the optical fiber 20, the light emitted from the optical fiber 20 is reduced. The NA can be made constant without depending on the length of the optical fiber 20. For example, since the plastic optical fiber (POF) 20 has NA = 0.5,
Speaking in the embodiment of FIG. 9, selected refractive indexes n _1, n ₂ of Ryofutome members 16 and 17, an optical material such that ^{_{(n 1 2 -n 2 2)}} 1/2 ≒ 0.5 do it.

Further, in the light emitting device of the present invention, the light emitting element 13
Are not aligned even if the center axis of the light emitting device is shifted.
As long as is sealed in the inner sealing member 16, the optical coupling efficiency with the optical fiber 20 does not change or fluctuate. That is, in the embodiment of FIG. 9,
If the light emitting element 13 is inside the inner sealing member 16, even if the light emitting element 13 is located at the center of the inner sealing member 16 as shown by the solid line, the light emitting element 13 is sealed inside as shown by the broken line. Even at a position deviated from the center of the member 16, the position variation of the light emitting element 13 does not pose a problem due to reflection at the boundary surface K.

(Third Embodiment) FIG. 11 is a sectional view showing a light emitting device D according to still another embodiment of the present invention. In this light emitting device D, the inner sealing member 1
6 and the outer sealing member 17 are both formed of a transparent resin, and the light emitting element 13 has a frustum-shaped inner sealing member 1.
6 is sealed inside the outer sealing member 17 on the back surface.

Even when the light emitting element 13 is sealed inside the outer sealing member 17 in this manner, the light emitting element 13
Out of the light emitted into the outer sealing member 17 through the inner sealing member 16 in the same manner as in the first embodiment. The light is totally reflected at the boundary surface K between the inner sealing member 16 and emitted from the front surface of the inner sealing member 16 to the outside.

Therefore, even in such an embodiment,
The use efficiency of light can be improved,
When the optical fiber 20 is connected, the optical coupling efficiency with the optical fiber 20 can be improved.

In this case, it is preferable that the position of the light emitting element 13 is as close as possible to the back surface of the inner sealing member 16. It does not affect the stopping performance.

(Fourth Embodiment) The light emitting area of the light emitting element 13 is not always small enough. When the light emitting area is large, the inner sealing member 16 having a frustum shape is used. The amount of light passing through the boundary surface K without being totally reflected at the boundary surface K between the stop member 16 and the outer sealing member 17 also increases.

In such a case, in the case of the light emitting element 13 having a large light emitting area, it is effective to curve the side surface of the inner sealing member 16. FIG. 12 is a cross-sectional view showing a light emitting device E according to still another embodiment of the present invention, showing an example of such a light emitting device, wherein the rear side surface of the inner sealing member 16 is formed in a parabolic shape. Thus, a curved surface 41 is formed on the boundary surface K. If the boundary surface K between the outer sealing member 17 and the inner sealing member 16 has such a shape,
Since the amount of light emitted from the light emitting element 13 and directed to the side, which can be directed forward, can be further increased, the light use efficiency is further improved. This is particularly effective when the light emitting element 13 having a large light emitting area is used.

(Fifth Embodiment) FIG. 13 is a sectional view showing a light emitting device F according to still another embodiment of the present invention. In this light emitting device F, the inner sealing member 16
A light-collecting element 42 in the form of a convex lens or Fresnel lens is formed on the front surface (light-emitting surface) of the light-emitting device. A light-collecting element portion 4 such as a convex lens shape or a Fresnel lens shape is provided on the front surface of the inner sealing member 16.
2, the divergence of light emitted from the front surface of the inner sealing member 16 to the outside can be suppressed. The formation region of the light-collecting element section 42 may extend to the front surface of the outer sealing member 17. Further, the light-collecting element section 42 may be formed by bonding a convex lens or the like, or may be formed integrally with the inner sealing member 16.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a conventional light emitting device.

FIG. 2 is a schematic explanatory view showing how light is coupled between a light emitting device and an optical fiber in a conventional example.

3A and 3B are a cross-sectional view and a front view showing a light emitting device according to one embodiment of the present invention.

FIG. 4 is a partially broken sectional view for explaining the behavior of light emitted from the light emitting element in the above light emitting device.

FIGS. 5A, 5B, and 5C are a perspective view, a plan view, and a cross-sectional view illustrating a shape of an outer sealing member used in the light emitting device of the above.

FIG. 6 is a partially broken sectional view showing a molding die for molding the outer sealing member of the above.

FIG. 7A is a partially cutaway sectional view showing a molding die for molding an inner sealing member, and FIG. 7B is a partially cutaway plan view of a lower mold thereof.

FIG. 8 is a view showing a molding die (cross section) for molding an inner sealing member, an outer sealing member inserted into the die, and a lead frame on which a light emitting element is mounted.

FIG. 9 is a cross-sectional view showing a state in which a resin is injected into an outer sealing member in a molding die to form an inner sealing member.

FIG. 10 is a sectional view showing a light emitting device according to another embodiment of the present invention.

FIG. 11 is a sectional view showing a light emitting device according to still another embodiment of the present invention.

FIG. 12 is a cross-sectional view illustrating a light emitting device according to yet another embodiment of the present invention.

FIG. 13 is a sectional view showing a light emitting device according to still another embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 13 light emitting element 15 resin molded part (package) 16 inner sealing member 17 outer sealing member K boundary surface between inner sealing member and outer sealing member

Claims (3)

[Claims] 1. A light emitting device in which a light emitting element is sealed in a transparent or translucent package and light emitted from the light emitting element is taken out of the package, wherein the package is a transparent sealing member made of a high refractive index material. And a transparent or translucent sealing member made of a low refractive index material, wherein a sealing member made of the low refractive index material is formed outside the sealing member made of the high refractive index material. Light emitting device. 2. A light-emitting device in which a light-emitting element is sealed in a transparent or translucent package and light emitted from the light-emitting element is taken out of the package, wherein the package is a transparent sealing member made of a high refractive index material. And a transparent or translucent sealing member made of a low-refractive-index material, and light emitted from the light-emitting element, wherein a sealing member made of the high-refractive-index material and a sealing member made of the low-refractive-index material A light emitting device which is totally reflected at a boundary surface between the light emitting device and the package and taken out of the package. 3. A method for manufacturing a light-emitting device according to claim 1, wherein a light-emitting element is disposed in a hollow interior of the sealing member which is pre-formed with a low refractive index material; Injecting a transparent high-refractive-index material into the hollow interior of the sealing member made of the low-refractive-index material, and molding the sealing member made of the high-refractive-index material into the sealing member made of the low-refractive-index material. Sealing the light emitting element in a sealing member made of a refractive index material.