JPH1093144A - Reflection type light-emitting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflection type light-emitting device which improves the heat radiation property and allows a light to be taken out outside effectively. SOLUTION: Leads 111 , 112 are made wider than the conventional leads to reduce the electric resistance of a lead and the calorific value even by flowing a large current of about 500mA and suppressing the temp. rise of a light- emitting element, because the leads themselves serve as a good radiating means. A reflective surface 13 is made asymmetric to the right and left, whereas the leads 111 , 112 are made wide, such that this surface is divided into about one half 13a at the lead drawing-out side and the other half 13b at the opposite side; the one half 13b is curved to radiate reflected lights outside, and the other half 13a is of a circular columnar shape, to finally take out to the outside also the lights arriving at the half 13a also.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection type light emitting device used as a light source in optical communication.

[0002]

2. Description of the Related Art FIG. 8 shows a general reflection type light emitting diode. FIG. 8 (a) is a plan view seen from the front, and FIG. 8 (b) is a cross section taken along the line yy in FIG. FIG. In the reflective light emitting diode shown in FIG. 8, the light emitting element 110 and the tips of _two leads 111 ₁ and 111 ₂ for supplying current to the light emitting element are sealed with a light transmitting material 112, and the light transmitting material is sealed. 1
12 is molded into a kamaboko shape. Of the surface of the light-transmitting material, a reflection surface 113 is provided on a side facing the light emitting surface of the light emitting element 110, and a radiation surface 1 is provided on a side opposite to the light emitting surface.
14 are formed. The reflective surface is treated by applying metal vapor deposition to the surface of the light-transmitting material 112 in the shape of a semicylindrical shape so as to reflect light reaching the surface from the light-emitting element 110 inside the light-transmitting material again to the inside. .

The reflection surface 113 is formed in a concave columnar shape, and the radiation surface 114 is a substantially rectangular flat surface of about 15 mm × 5 mm. The light emitting element 110 is mounted on the tip of _one lead 111 ₁ with the light emitting surface facing down, and the other lead 111 ₂ is connected to a bonding wire (not shown).
Connected by The lead 1 is connected to the pn junction of the light emitting element 110.
11 _1, 111 when ₂ to supply current from, emit light from the downward of the light emitting surface. This light is reflected by the reflecting surface 113 and emitted from the emitting surface 114 to the outside. By making the shape of the reflection surface a curved surface as shown in FIG. 8, the reflection type light emitting diode has a certain directivity.

[0004]

When a reflection type light emitting diode having the structure shown in FIG. 8 is used for optical communication using infrared light, it is necessary to supply a large current of about 500 mA to the light emitting element. It may be. In such a case, if the lead is thin as shown in FIG. 8, the thermal conductivity is small, and therefore, the calorific value of the lead increases. Further, since the leads are thin, the heat radiation effect via the leads is insufficient. For this reason, when a large current flows through the lead, the temperature of the light emitting element rises, which causes deterioration or destruction of the light emitting element. In order to prevent such heat generation and temperature rise of the light emitting element, it is effective to increase the size of the lead. That is, when the size of the lead is increased, the heat conductivity is increased, so that heat generation is reduced. Further, since the surface area is increased, the heat radiation effect via the lead is also improved. However, in FIG.
Since the light reflected from the reflection surface 113 is on the way to the radiation surface 114 on the leads 111 ₁ and 111 ₂ , the propagation of light is hindered by enlarging the leads.
When the lead is made large, the light extraction efficiency becomes poor.

The present invention has been made based on the above circumstances, and an object of the present invention is to provide a reflection type light emitting device capable of improving heat radiation and efficiently extracting light to the outside. And

[0006]

According to an aspect of the present invention, there is provided a light-emitting device that emits light from a light-emitting surface, a lead portion that supplies a current to the light-emitting device,
A light-transmitting material that seals the light-emitting element and a part of the lead portion, and the light-emitting element formed on a side of the light-transmitting material on which a light-emitting surface of the light-emitting element is opposed to the light-emitting element emits light. A reflection type having a concave columnar reflecting surface that reflects light, and a radiation surface that radiates light to the outside formed on the side of the light transmitting material opposite to the light emitting surface of the light emitting element. In the light emitting device, the lead portion is extended to one side surface of the reflection surface when viewed from the front, and the width of the lead portion is at least about twice as large as the light emitting element. Approximately half of the surface on the side from which the lead portion is extended is formed in a cylindrical shape having an axis as a straight line passing through the light emitting element and substantially parallel to the reflecting surface, and the light emitting element emits light and is reflected by the reflecting surface. Light on the side where the lead portion is not drawn out. Characterized in that it is radiated to the outside from the morphism surface.

According to a third aspect of the present invention, a light emitting element which emits light from a light emitting surface, a lead for supplying a current to the light emitting element, and a part of the light emitting element and the lead are sealed. A light-transmissive material, a concave columnar reflecting surface formed on a surface of the light-transmissive material on a side facing a light-emitting surface of the light-emitting element, and reflecting light emitted by the light-emitting element; In a reflective light-emitting device having a radiation surface for emitting light to the outside formed on the side opposite to the light-emitting surface of the light-emitting element of the surface of the transparent material, the lead portion is viewed from the front. A plane that is drawn out to one side surface side of the reflection surface, the width of the lead portion is at least about twice as large as the light emitting element, and is substantially perpendicular to or slightly inclined with respect to the lead portion. Approximately half of the side from which the lead is pulled out Notch the reflecting surface and the light-transmitting material Ku, characterized in that the plane was a reflection surface.

According to the first aspect of the present invention, since the width of the lead portion is at least about twice as large as that of the light emitting element, heat dissipation is improved and a rise in temperature of the light emitting element can be suppressed. . Also, light emitted from the light emitting element toward about half of the side opposite to the side from which the lead portion is drawn out of the reflecting surface is reflected by this reflecting surface, and from the emitting surface from which the lead portion is not drawn out. Radiated to the outside. On the other hand, light emitted from the light emitting element toward about half of the side from which the lead portion is drawn out of the reflecting surface passes through about half of the reflecting surface through which the lead portion is drawn out, passes through the light emitting element, and passes through the reflecting surface The light emitted from the light emitting element toward the cylindrical reflecting surface is reflected by the reflecting surface, and the light emitting element is provided. Toward the tip of the lead part, and further reflected at the tip of the lead part, reflected at about half of the reflection surface opposite to the side from which the lead part was pulled out, and finally the lead part of the radiation surface Radiated to outside from unextracted side.

According to the third aspect of the present invention, since the width of the lead portion is at least about twice as large as that of the light emitting element, heat radiation is improved and a rise in temperature of the light emitting element can be suppressed. . Further, light emitted from the light emitting element toward about half of the reflection surface on the opposite side to the side from which the lead portion is drawn is reflected by the reflection surface and emitted from the radiation surface to the outside. On the other hand, light emitted from the light emitting element toward the planar reflecting surface is reflected by the planar reflecting surface, and further,
After being reflected by the reflection surface on the side opposite to the side from which the lead portion is pulled out, it is radiated to the outside.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1A and 1B are views showing a reflection type light emitting diode according to a first embodiment of the present invention, wherein FIG. 1A is a plan view seen from the front, and FIG.
It is a sectional view seen from the arrow y. The reflective light emitting diode of FIG.
The light-emitting element 10 and the two leads 11 ₁ and 11 ₂ for supplying current to the light-emitting element are sealed with a light-transmissive material 12 at the tips, and the light-transmissive material 12 is molded into a semicylindrical shape. . Of the surface of the light-transmitting material, a concave cylindrical reflecting surface 13 is formed on the side facing the light emitting surface of the light emitting element 10, and a radiation surface 14 is formed on the side opposite to the light emitting surface. The radiation surface 14 is a substantially rectangular flat surface of about 15 mm × 5 mm. The light emitting element 10 is mounted toward the reflecting surface 13 side light emitting surface to the back surface of one lead 11 ₁ of the front end portion, and the ₂ other leads 11 are connected by bonding wires (not shown). In this specification, an end in the left-right direction in FIG. 1A is referred to as a side surface, and an end in the up-down direction is referred to as an end surface.

In the embodiment shown in FIG.
C11₁And 11_TwoWidth w₁, W_TwoIs widened. Ingredient
Physically, w₁, W_TwoIs sufficiently compared to the light emitting element 10.
The width is at least twice the width of the light emitting element 10 or more.
Therefore, lead 11₁, 11 _TwoThe thermal conductivity of
C 111₁, 111_TwoConsiderably larger than
Even if a large current of about 500 mA flows, the lead itself
Is a good heat radiating means, so that the temperature of the light emitting element 10 rises.
Can be suppressed more effectively than in the case of FIG.

On the other hand, if the leads 11 ₁ and 11 ₂ are formed to have a wide shape as shown in FIG. 1, light reflected on the reflecting surface is blocked by the leads. Therefore, in the embodiment of FIG.
Is divided into about half 13a on the side from which the lead is drawn and about half 13b on the side opposite to the side from which the lead is drawn. The portion 13b has the same shape as that of FIG. 8, for example, the light from the light emitting element 10 is condensed to the outside via the radiation surface 14, the light is spread at a predetermined angle, or the parallel light is emitted. The shape is such that In contrast, 1
The portion 3a passes through the light emitting element 10 and the reflecting surface 13a.
A cylindrical reflecting surface which forms a part of the surface of a cylinder having a straight line substantially parallel to the axis as an axis. That is, in FIG. 1B, the reflection surface 13 is asymmetric on the left and right.

By forming the reflecting surface 13 in such a shape, the light emitted from the light emitting element 10 is emitted to the outside along the following path. First, light reaching the reflective surface 13b from the light emitting element 10 is reflected by the reflective surface 13b,
The light is radiated from the radiation surface 14 to the outside. This route is shown in FIG.
(B) is indicated by a dashed line 17. Then, the light emitted from the light emitting element 10 reaches the reflecting surface 13a, when reflected at 13a, the lead 11 _1, 11 ₂ of the front end portion 15 (FIG. 1
(Shown by diagonal lines in (a)).
The light is reflected again at 5 and goes to the reflection surface 13b. After that, similarly to the light that directly reaches 13b from the light emitting element 10,
The light is reflected by the reflection surface 13b and is emitted from the emission surface 14 to the outside. This path is indicated by a two-dot chain line 18. Thus, by about half 13a of the reflecting surface and the above-mentioned cylindrical surface shape, even if the lead 11 _1, 11 ₂ as wide shape as shown in FIG. 1, the radiation of light to the outside by leads Without being hindered, light can be effectively extracted.

FIGS. 2A and 2B are views showing a reflection type light emitting diode according to a second embodiment of the present invention, wherein FIG. 2A is a plan view as viewed from the front, and FIG. FIG. FIG.
, The same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted. In this embodiment, the light emitting element 1
2 of the light-transmitting material 22 on the side facing the light-emitting surface of FIG.
And notched with a plane substantially perpendicular right half weak to lead 11 _1, 11 ₂ (b), located on the lead 11 _1, 11 ₂ side of the light emitting element 10 substantially perpendicular to the radiating surface 14 A planar reflecting surface 23a was provided. However, this plane is not necessarily lead 11 _1, 11 ₂ to need a vertical, may be inclined slightly. Also, in FIG. 2B, when the notch is cut using the plane, the portions of the leads 11 ₁ and 11 ₂ are left, but if sufficient strength is obtained, the notch may be left without this portion. it can. On the other hand, FIG.
FIG. 1B shows the concave reflecting surface 23b on the left side of FIG.
It has the same shape as the reflection surface 13b on the left side of FIG.

Light reaching the reflecting surface 23b from the light emitting element 10 is reflected by the reflecting surface 23b as shown by a dashed line 27, and is emitted from the emitting surface 14 to the outside. On the other hand, light emitted from the light emitting element 10 and reaching the planar reflecting surface 23a is:
As shown by the two-dot chain line 28, when the light is reflected on the planar reflecting surface 23a, it reaches the reflecting surface 23b, is reflected on the reflecting surface 23b, and is emitted from the emitting surface 14 to the outside. The leads 11 ₁ , 11 are formed by forming the reflecting surface as a flat reflecting surface 23a and a concave reflecting surface 23b as shown in FIG.
_{Even if 2} has a wide shape, the lead does not block light, and the light emitted by the light emitting element 10 can be effectively radiated to the outside.

FIG. 3 is a view showing a reflective light emitting diode according to a third embodiment of the present invention. In FIG. 3, (a) is a plan view seen from the front, and (b) is yy of (a). Arrow sectional view,
(C) is a sectional view taken along the line xx in (a). In this embodiment, a taper as shown in the figure is formed at both ends in the longitudinal direction of the reflection type light emitting diode, and this is formed into the planar reflection surfaces 33a, 33a.
3b. Here, the angle between the planar reflecting surfaces 33a and 33b and the reflecting surface 13 is φ, the distance from the light emitting element 10 to the opposing reflecting surface 13 (to the point S in FIG. 3C) is a, and the reflection from the S point is a. The shortest distance to the intersection of the surface 13 and the planar reflecting surface 33a (33b) is r. In FIG. 3, the same parts as those in FIG. 1 are denoted by the same reference numerals, and description thereof will be omitted.

In the first embodiment shown in FIG. 1, light traveling from the light emitting element 10 toward the end face leaks from both ends of the light transmitting material to the outside, and becomes useless light without contributing to its intended purpose. Therefore, in the present embodiment, by providing the tapered planar reflecting surfaces 33a and 33b as shown in FIG. 3 at both ends in the longitudinal direction, light traveling toward the end surface side is reflected here and emitted from the radiation surface 14. I made it. This route is shown in FIG.
Are indicated by alternate long and short dash lines 36 and 37. This makes it possible to effectively use light traveling in both end directions, which is wasted in the configuration of FIG.

In order for all of the light reflected by the planar reflecting surfaces 33a and 33b to be effectively radiated from the radiation surface 14 to the outside, the incident angle on the radiation surface must be the critical angle θ (θ is the light transmission (Determined by the refractive index of the conductive material). Based on this, the conditions that must be satisfied by φ, r, and a are determined with reference to FIG. 4, FIG. 5, and FIG.

FIG. 4 shows a case where the light emitted from the light emitting element 10 travels in the horizontal direction (vertical direction in FIG. 3C).
When this light is reflected by the planar reflecting surface 33a (33b) and enters the radiation surface 14, the incident angles are P ₁ (in the case of FIG. 4A) and P ₂ (in the case of FIG. 4B). Then, P ₁ = 90 ° −2φ P ₂ = 2φ−90 °. Since both P ₁ and P ₂ must be smaller than θ, P ₁ (= 90 ° −2φ) <θ P ₂ (= −90 ° + 2φ) <θ, and therefore 45 ° −θ / 2 < φ <45 ° + θ / 2 (1)

Next, FIG. 5 shows a case where light emitted from the light emitting element 10 is reflected at an end point on the reflecting surface 13 side on the planar reflecting surface 33a (33b). When the light is reflected at this point and enters the radiation surface 14, the incident angles are P ₃ (in the case of FIG. 5A) and P ₄ (in the case of FIG. 5B). If the angle formed by the perpendicular extending to the point S on the line 13 is Q, then P ₃ = Q−2φ P ₄ = 2φ−Q. Since both P ₃ and P ₄ must be smaller than θ, P ₃ (= Q−2φ) <θ P ₄ (= 2φ−Q) <θ. From this, 2φ−θ <Q <2φ + Q, but since Q does not become larger than 90 °,
The rightmost side does not need to be considered, so that 2φ−θ <Q. By taking the tangent of both sides of this equation and multiplying by a, atan (2φ−θ) <atanQ is obtained. Here, if tanQ = r / a is substituted, atan (2φ−θ) <r (2) Becomes

FIG. 6 shows that the light emitted from the light emitting element 10 is reflected by the flat reflecting surface 33a (33) on the reflecting surface 13.
This is a case where light is reflected at the end point on the b) side. The angle of incidence when the light is reflected at this point and enters the radiation surface 14 is equal to the angle Q between the light emitting element 10 and the perpendicular extending to the point S on the reflection surface 13. Therefore, Q <θ must be satisfied. Taking the tangent of both sides of this equation gives tanQ <tanθ, and substituting tanQ = r / a gives r <atanθ (3). The expressions (1), (2), and (3) are conditional expressions that φ, r, and a of the reflective light-emitting diode of the third embodiment shown in FIG. 3 must be satisfied.

FIGS. 7A and 7B are views showing a reflection type light emitting diode according to a fourth embodiment of the present invention, wherein FIG. 7A is a plan view seen from the front, and FIG. 7B is yy of FIG. It is arrow sectional drawing. 7, the same parts as those in FIG. 1 are denoted by the same reference numerals, and the description thereof will be omitted. In the present embodiment, six leads 41 _1, 41 _2, 41 _3, 41 _4, 41 _5, 41 ₆ is provided, the lead 41 ₁ of these five, 41 _2, 41 _3,
The light emitting elements 40 ₁ , 40 ₂ , 4 are provided at the tips of 41 ₄ , 41 _5.
0 _3, 40 _4, 40 ₅ are mounting. Therefore, it is possible to achieve a brightness several times higher than the case where a single light emitting element is provided. The width of each lead 41 ₁ and the like, compared to the width of such light-emitting elements 40 _1, broadly at least twice.
Each light emitting element is connected in series. Therefore, 6
To function as the original lead of the lead is only leads 41 ₁ and 41 ₆ at both ends, the other leads are functioning only as a mount means and radiation means of the light emitting element.

The reflecting surface 13 of the present embodiment corresponds to the first real surface shown in FIG.
It is formed in the same shape as the embodiment. Therefore, each
Light emitting element 40₁, 40_Two, 40_Three, 40_Four, 40_FiveFrom
Each light emitted is described in connection with FIG.
As described above, the light reaching the reflecting surface 13b is reflected by the reflecting surface 13b.
The light is reflected and radiated from the radiation surface 14 to the outside. Meanwhile, anti
Light reaching the launch surface 13a is reflected at 13a
And lead 41₁, 41 _Two, 41_Three, 41_Four, 41_Five,
41₆To the tip 15 of the lead, and
Reflected toward the reflection surface 13b, and reflected on the reflection surface 13b.
And is radiated from the radiation surface 14 to the outside. this
As shown, about half 13b of the reflection surface is cylindrical
And a large number of leads 41₁, 41_Two, 41
_Three, 41_Four, 41_Five, 41₆Are arranged side by side as shown in FIG.
Lead, the lead blocks the emission of light to the outside
Light can be effectively extracted outside.
Wear.

[0024] As a variation of this embodiment, the shape of the reflective surface in the same manner as the second embodiment (FIG. 2), the light-emitting elements 40 ₁ to
40 ₅ of lacking right slightly less than half cut out of the light emitting surface side of the light transmissive material 12 opposite to the position the lead 41 _{1-41 6} side of the light emitting element 40 _{1-40 5} and the radiation surface 14 substantially perpendicular May be provided. Also in this case, the light from the light emitting element 40 _{1-40 5} reaches the planar reflecting surface, since it is reflected in the planar reflecting surface reaches the reflecting surface, is reflected by the reflecting surface 13b to the outside from the radiation surface 14 Radiated. Therefore, it is possible to effectively radiated to the outside light emitting element 40 _{1-41 5} uttered.

The present invention is not limited to the above embodiments, and various changes can be made within the scope of the invention. For example, in the fourth embodiment of FIG. 7, six leads and five light emitting elements are provided, but other numbers of leads and light emitting elements may be provided. Further, in each of the above embodiments, the reflection type light emitting diode is described. However, the present invention includes not only the diode but also a reflection type light emitting device using other light emitting elements.

[0026]

As described above, according to the first aspect of the present invention, the width of the lead portion is set to at least about 2
Even if a large current is applied to the light emitting element through this lead portion, heat generation is small, and
Since the generated heat can be effectively dissipated through the lead portion, the temperature rise of the light emitting element can be suppressed, and the deterioration and destruction of the light emitting element can be effectively prevented. Also, by forming about half of the concave columnar reflection surface of the reflection type light emitting device on the side from which the lead portion is drawn out into a cylindrical surface with a straight line passing through the light emitting element and substantially parallel to the reflection surface as an axis. The light reflected by the cylindrical reflecting surface is reflected by the tip of the lead portion, and further reflected by the reflecting surface on the side opposite to the side from which the lead portion is pulled out, and emitted to the outside. The emitted light can be effectively extracted to the outside, and the external extraction efficiency is improved.

According to the third aspect of the present invention, since the width of the lead portion is at least about twice as large as that of the light emitting element, even if a large current flows to the light emitting element through the lead portion, heat is generated. Since the generated heat can be effectively dissipated through the lead portion, a rise in the temperature of the light emitting element can be suppressed, and deterioration and destruction of the light emitting element can be effectively prevented. Light emitted from the light emitting element toward the planar reflecting surface is reflected on the planar reflecting surface, further reflected on the reflecting surface on the side opposite to the side from which the lead portion is drawn, and emitted to the outside. Therefore, it is possible to provide a reflection type light emitting device in which light emitted from the light emitting element can be effectively extracted to the outside, and the external extraction efficiency is improved.

[Brief description of the drawings]

FIGS. 1A and 1B are diagrams showing a reflective light emitting diode according to a first embodiment of the present invention, wherein FIG. 1A is a plan view seen from the front, and FIG.
FIG. 3 is a sectional view taken along the line yy in FIG.

FIGS. 2A and 2B are diagrams showing a reflective light emitting diode according to a second embodiment of the present invention, wherein FIG. 2A is a plan view seen from the front, and FIG.
FIG. 3 is a sectional view taken along the line yy in FIG.

FIGS. 3A and 3B are views showing a reflective light emitting diode according to a third embodiment of the present invention, wherein FIG. 3A is a plan view seen from the front, and FIG.
FIG. 4A is a cross-sectional view taken along the line yy in FIG. 4A, and FIG.
It is arrow sectional drawing.

FIG. 4 is a diagram for considering conditions that must be satisfied by φ, r, and a in the third embodiment.

FIG. 5 is a diagram for considering conditions that must be satisfied by φ, r, and a in the third embodiment.

FIG. 6 is a diagram for considering conditions that must be satisfied by φ, r, and a in the third embodiment.

FIGS. 7A and 7B are views showing a reflection type light emitting diode according to a fourth embodiment of the present invention, wherein FIG. 7A is a plan view seen from the front, and FIG.
FIG. 3 is a sectional view taken along the line yy in FIG.

FIG. 8 shows a general reflection type light emitting diode,
FIG. 3A is a plan view as viewed from the front, and FIG.
3 is a sectional view taken along the line y-y of FIG.

[Explanation of symbols]

10, 40 ₁ to 40 ₅ , 110 Light emitting elements 11 ₁ , 11 ₂ , 41 _{1 to} 41 ₆ , 111 ₁ , 111 ₂
Leads 12, 22, 112 Light transmitting material 13, 23a, 23b, 33a, 33b, 113 Reflecting surface 14, 114 Radiating surface 15 Lead tip

Claims (4)

[Claims] A light-emitting element that emits light from a light-emitting surface; a lead that supplies current to the light-emitting element; a light-transmitting material that seals the light-emitting element and a part of the lead; A concave columnar reflecting surface for reflecting light emitted by the light emitting element formed on the side of the surface of the light transmitting element opposite to the light emitting surface of the light emitting element, and the light transmitting material of the surface And a radiation surface for emitting light to the outside formed on the side opposite to the light-emitting surface of the light-emitting element, wherein the lead portion has one side surface of the reflection surface when viewed from the front. And the width of the lead portion is at least about twice as large as that of the light emitting element. About half of the reflective surface from which the lead portion is drawn out passes through the light emitting element and passes through the reflective surface. Formed into a cylindrical surface with a straight line almost parallel to Serial light emitting element is reflected by the reflecting surface emitted by the reflective light emitting device characterized in that it is externally radiated from the radiation surface of the side where the lead portion is not pulled out. 2. A tapered planar reflecting surface is provided at both ends in the linear direction of the reflecting surface, and the inclination of the planar reflecting surface is changed by the light reaching the planar reflecting surface from the light emitting element. 2. The reflection type light emitting device according to claim 1, wherein the radiation surface is not totally reflected but is entirely radiated to the outside. 3. A light-emitting element that emits light from a light-emitting surface, a lead that supplies current to the light-emitting element, a light-transmissive material that seals the light-emitting element and a part of the lead, and the light. A concave columnar reflecting surface for reflecting light emitted by the light emitting element formed on the side of the surface of the light transmitting element opposite to the light emitting surface of the light emitting element, and the light transmitting material of the surface And a radiation surface for emitting light to the outside formed on the side opposite to the light-emitting surface of the light-emitting element, wherein the lead portion has one side surface of the reflection surface when viewed from the front. And the width of the lead portion is at least about twice as large as the light emitting element, and the lead portion is drawn out using a plane that is substantially perpendicular to or slightly inclined with respect to the lead portion. The reflection surface and the light near approximately half of the Notch over material, reflection type light emitting device, characterized in that the plane was a reflection surface. 4. The reflection type light emitting device according to claim 1, wherein a plurality of the light emitting elements and the lead portions are arranged.