JP2006108363A - Housing of light emitting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To suppress the manufacturing cost of the housing of a light emitting device and realize wide-angle light from the light emitting device. <P>SOLUTION: The housing 10 of the light emitting device has a plurality of guides 24 provided with gaps 25 around an opening 21 which are directed outwardly from the opening 21 and fixed in a state wherein their sides are inclined in the direction of the center of the opening 21. The guides 24 consist of a plurality of support members 22 whose one ends are fixed to the circumference of the opening 21 and locking members 23 for fixing the other ends of the support members. The gap 25 defined by the spacing between the support members 22 is made to have such an area that a transparent resin 30 in the liquid phase before curing applied there does not exude externally due to the surface tension thereof. Consequently, the transparent resin 30 can be projected externally from the housing 20 by one time injection thereof without adding the manufacturing process for processing the transparent resin 30, and the light from the light emitting device 1 disposed on the bottom of the opening 21 can be radiated upward from the opening and can be radiated from the side surface of the guide by using the transparent resin as a medium. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an envelope of a surface mount type light emitting element.

  A light-emitting diode (hereinafter referred to as LED) is a light-emitting element that forms a PN junction on a compound semiconductor wafer such as InGaAlP or GaN, and emits visible or near-infrared light through a forward current. It is widely applied to communication, measurement, control, etc.

  Generally, a package (hereinafter referred to as an envelope) is required for a light emitting element such as an LED. As an example, an envelope of a surface mount type light emitting element having a configuration as shown in the perspective view of FIG. (For example, refer to Patent Document 1).

  The envelope 50 in the figure includes a housing 20 having an opening 21, the light emitting element 1 disposed on the bottom surface of the opening 21, a transparent resin 30 filled from the bottom to the top of the opening 21, Is provided. The transparent resin 30 is potted in a liquid state, and then heated and cured. Although the viscosity in the liquid phase is high, the surface of the transparent resin 30 becomes almost flat due to gravity. On the bottom surface of the opening 21, the light emitting element 1 is mounted on one pole 11 of a lead frame having two poles with a conductive material such as silver paste. Further, a gold wire 3 is stretched from the upper electrode of the light emitting element 1 on the other pole 12 of the lead frame.

  Here, an LED is used as the light emitting element 1, and an epoxy resin is used as the transparent resin 30. The casing 20 is made of thermoplastic PPA (polyphthalamide) resin. The casing 20 as shown in FIG. 7 is molded by injecting PPA resin fluidized by heating into a cold mold (injection molding method).

  On the other hand, when a light emitting element such as an LED is applied to an automobile meter cluster or the like as an in-vehicle LED lamp, in order to cause the light emitting element to emit light at a wide angle as much as possible with a single envelope, it is widely used by a diffusion plate. It is necessary to illuminate the object evenly across.

FIG. 8 shows a spatial radiation pattern of the light emitting device shown in FIG. According to the figure, since the refractive index of the epoxy resin is about 1.5, upward radiation is dominant due to the difference in refractive index with air. Thereby, the light of the light emitting element has directivity characteristics such that the full width at half maximum of the radiation angle θ is about 110 degrees.
JP 2003-163378 A

  However, in the configuration of the envelope of the conventional surface mount type light emitting element as shown in FIG. 7, the surface of the transparent resin 30 is flattened in the liquid phase, so that the radiation angle of light as shown in FIG. There is a limit to the spread of. On the other hand, when the surface of the cured transparent resin is processed using an optical method, or when a transparent resin having an appropriate raised shape is attached to the surface of the transparent resin, a wide angle of light is realized. However, there is a problem that a separate manufacturing process is required for this purpose, resulting in an increase in manufacturing cost.

  In view of such problems, the present invention suppresses an increase in manufacturing cost of the envelope of the light emitting element and realizes a wide angle of light of the light emitting element.

  The envelope of the light-emitting element according to the first aspect of the present invention includes a housing having an opening, a light-emitting element disposed on the bottom surface of the opening, the periphery of the opening facing the outside of the opening, and the side A guide having a plurality of gaps fixed in a state where the portion is inclined toward the center of the opening, and a transparent resin filled from the bottom of the opening to the top of the guide, and provided in the guide The gap is characterized in that the transparent resin does not exude to the outside due to surface tension in the liquid phase before the transparent resin is cured.

  According to the present invention, the envelope of the light emitting element includes a plurality of gaps that are fixed around the periphery of the opening so as to face the outside of the opening and the side portions are inclined toward the center of the opening. By having a guide, the transparent resin can be protruded outside the housing by a single injection without adding a manufacturing process for processing the transparent resin, and from the light emitting element arranged at the bottom of the opening. This light can be emitted from the upper direction of the opening and the side surface of the guide using a transparent resin as a medium.

  Furthermore, the guide provided in the envelope of the light emitting device according to the first aspect of the present invention includes a plurality of support portions whose one ends are fixed around the opening portion, and a fastening portion that fixes the other end of the support portion. The gap provided in the guide is preferably in a range in which the transparent resin does not bleed out due to surface tension in the liquid phase before the transparent resin is cured, and the gap is defined by the interval between the support portions. It is desirable.

  Further, the guide provided in the envelope of the light emitting element according to the first aspect of the present invention includes a plurality of guides having one end fixed to the periphery of the opening in a state where the width direction of the one end is aligned with the opening radial direction. The gap formed in the support and provided in the guide is preferably in a range where the transparent resin does not bleed out due to surface tension in the liquid phase before the transparent resin is cured. It is desirable that the width of the other end is shorter than the width, and the gap is defined by the interval between the support portions.

  According to the envelope of the light emitting element of the present invention, an increase in manufacturing cost can be suppressed and a wide angle of light of the light emitting element can be realized.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a perspective view showing the configuration of the envelope of the light emitting element according to the first embodiment. The envelope 10 shown in FIG. 1 includes a housing 20 having an opening 21, the light emitting element 1 disposed on the bottom surface of the opening 21, and the side of the opening 21 around the opening 21. The guide 24 having a plurality of gaps 25 a, 25 b, 25 c... (Hereinafter collectively referred to as 25) fixed in a state where the portion is inclined toward the center of the opening 21, and the guide 24 from the bottom of the opening 21. Transparent resin 30 filled up to the top. Here, the guide 24 has an annular shape that fixes a plurality of support portions 22 a, 22 b, 22 c... (Hereinafter collectively referred to as 22) having one end fixed around the opening 21 and the other end of the support portion 22. The gap 25 provided in the guide 24 is defined by the interval between the support portions 22. On the bottom surface of the opening 21, the light emitting element 1 is mounted on one pole 11 of a lead frame having two poles with a conductive material such as silver paste. Further, a gold wire 3 is stretched from the upper electrode of the light emitting element 1 on the other pole 12 of the lead frame. Here, an LED is used as the light emitting element 1, and a PPA (polyphthalamide) resin that is white thermoplastic that reflects under conditions close to perfect diffuse reflection is used for the housing 20. The transparent resin 30 is an epoxy resin.

  FIG. 2 is a cross-sectional view showing the configuration of the envelope of the light emitting element according to the first embodiment. The same components as those in FIG. 1 are denoted by the same reference numerals, and the description already given is omitted. As shown in the figure, the transparent resin 30 injected into the opening 21 reaches the upper part of the guide 24, and a flat surface is formed on the upper part. Here, since the gap 25 provided in the guide is defined in a sufficiently small range as the interval between the support portions 22, even if it is a liquid phase before curing, the transparent resin 30 remains on the side portion of the guide. It does not ooze out from the outside.

  FIG. 3 is a spatial radiation pattern for the light emitting device according to the first embodiment. The light emitted from the light emitting element disposed on the bottom surface of the opening is emitted from the upper surface of the flat transparent resin 30 formed on the upper portion of the guide and also from the side surface of the guide. Therefore, the radiation angle θ has a directional characteristic such that the full width at half maximum is about 160 degrees, and the emission angle of the light emitting element can be widened as compared with the conventional surface-mounted radiation pattern of FIG. .

  Therefore, according to the first embodiment, a plurality of envelopes of the light emitting element are fixed around the opening so as to face the outside of the opening and the side portions are inclined toward the center of the opening. A guide having a gap is provided, and the guide is composed of a plurality of support portions whose one ends are fixed around the opening and a fastening portion for fixing the other end of the support portion. In the liquid phase before curing, the range in which the transparent resin does not bleed out due to surface tension is defined by the interval between the support parts, so that a single injection can be performed without adding a manufacturing process for processing the transparent resin. Transparent resin can be projected outside the housing, and light from the light emitting element placed at the bottom of the opening can be emitted from the top of the opening and the side of the guide using the transparent resin as a medium It becomes. As a result, an increase in manufacturing cost can be suppressed and a wide angle of light of the light emitting element can be realized.

  In the first embodiment, an annular member is used for the fastening portion 23 that fixes the other end of the support portion 22 of the guide 24. However, the present invention is not limited to this. If it is the structure which has the function to fix the support part of the guide 24, you may use a polygon-shaped member for a fastening part, for example.

[Second Embodiment]
FIG. 4 is a perspective view showing the configuration of the envelope of the light emitting element according to the second embodiment. The envelope 40 shown in the figure has the same housing 20 as that of the first embodiment, the light emitting element 1, the opening 21 around the opening 21, and the side of the opening 21. A guide 28 having a plurality of gaps 26 a, 26 b, 26 c... (Hereinafter collectively referred to as 26) fixed in an inclined state in the center direction, and a transparent filled from the bottom of the opening 21 to the top of the guide 24 And resin 30. The difference from the first embodiment is that the guide 28 has a plurality of support portions 27a, 27b, and 27c each having one end fixed to the periphery of the opening in a state where the width direction of the one end matches the opening radial direction. ... (hereinafter collectively referred to as 27). The gap 26 provided in the guide 28 is defined by the interval between the support portions 27. Similarly, the light emitting element 1 is mounted on the bottom surface of the opening 21 on one electrode 11 of a lead frame having two electrodes with a conductive material such as silver paste. Further, a gold wire 3 is stretched from the upper electrode of the light emitting element 1 on the other pole 12 of the lead frame. Here, an LED is used as the light emitting element 1, and an epoxy resin is used as the transparent resin 30. The casing 20 is made of thermoplastic PPA (polyphthalamide) resin. The casing 20 shown in FIG. 4 is integrally formed with the support portion 27 by injecting and molding PPA resin fluidized by heating into a cold mold.

  FIG. 5 is a cross-sectional view showing the configuration of the envelope of the light emitting element according to the second embodiment. Here, the same components as those in FIG. 4 are denoted by the same reference numerals, and the description already given is omitted. As shown in the figure, the transparent resin 30 injected into the opening 21 reaches the upper part of the guide 28, and a flat surface is formed on the upper part. Here, since the gap 26 provided in the guide 28 is defined in a sufficiently small range as the interval between the support portions 27, even if it is a liquid phase before curing, the transparent resin 30 is not There is no oozing out from the side.

  Further, in the present embodiment, as shown in FIG. 5, the width L2 at the other end is shorter than the width L1 at the one end of the support portion 27 constituting the guide 28. With such a configuration, at the time of molding of the casing 20 by the above-described injection molding method, a thermoplastic resin fluidized by heating is injected into a cold mold to take a mold, and then the thermoplastic resin This is because the side portion of the guide can be formed by causing the support portion 27 to fall down toward the center of the opening portion 21 in accordance with the cooling.

  FIG. 6 shows a spatial radiation pattern of the light emitting device according to the second embodiment. The light emitted from the light emitting element arranged on the bottom surface of the opening is emitted from the upper surface of the flat transparent resin 30 formed on the upper part of the guide and also from the side part of the guide. Has a directional characteristic such that the full width at half maximum of the radiation angle θ is about 160 degrees, and compared with the conventional surface-mount radiation pattern of FIG. You can see that

  According to the second embodiment, with respect to the guide provided in the envelope of the light emitting element, a plurality of one end portions thereof are fixed around the opening portion in a state where the width direction of the one end portion is aligned with the opening radial direction. In addition to defining the range where the transparent resin does not bleed to the outside due to surface tension in the liquid phase before curing of the transparent resin, the guide is configured with the support portion. The width of the other end portion is shorter than the width of one end portion of the supporting portion. As a result, the structure of the mold used when molding the casing by the injection molding method can be made simpler, and the guide and the casing can be made from the thermoplastic resin fluidized by heating in a single process. Can be formed integrally, so that in addition to the effects of the first embodiment, an increase in manufacturing cost accompanying an increase in the number of manufacturing steps can be further suppressed.

It is sectional drawing which shows the structure of the envelope of the light emitting element which concerns on 1st Embodiment. It is a perspective view which shows the structure of the envelope of the light emitting element which concerns on 1st Embodiment. It is a spatial radiation pattern of the light emitting element which concerns on 1st Embodiment. It is sectional drawing which shows the structure of the envelope of the light emitting element which concerns on 2nd Embodiment. It is a perspective view which shows the structure of the envelope of the light emitting element which concerns on 2nd Embodiment. It is a spatial radiation pattern of the light emitting element which concerns on 2nd Embodiment. It is a perspective view which shows the structure of the envelope of the conventional surface mount type light emitting element. It is the spatial radiation pattern of the light emitting element in the envelope of the conventional surface mount type light emitting element.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Light emitting element, 3 ... Gold wire, 10 ... The envelope of the light emitting element which concerns on 1st Embodiment, 11 ... One pole of a lead frame, 12 ... The other pole of a lead frame, 20 ... Housing | casing, DESCRIPTION OF SYMBOLS 21 ... Opening part of envelope, 22 ... Support part which supports transparent resin, 23 ... Ring-shaped fastening part which fixes support part, 24 ... Guide which consists of support part and annular-shaped fastening part, 25 ... Gap of guide , 26 ... guide gaps, 27 ... support portions for supporting the transparent resin, 28 ... guides made up of a plurality of support portions, 30 ... transparent resin, 40 ... the envelope of the light emitting device according to the second embodiment, 50 ... A conventional surface-mounted light emitting device envelope,

Claims (3)

A housing with an opening;
A light emitting device disposed on a bottom surface of the opening;
A guide provided with a plurality of gaps that are fixed to the periphery of the opening in a state in which the opening is directed to the outside of the opening and the side is inclined toward the center of the opening;
A transparent resin filled from the bottom of the opening to the top of the guide;
Have
The gap provided in the guide is in a range where the transparent resin does not bleed out due to surface tension in the liquid phase before the transparent resin is cured. The guide has a plurality of support portions each having one end fixed around the opening;
A fastening part for fixing the other end of the support part;
Consists of
The envelope of the light emitting device according to claim 1, wherein the gap is defined by an interval between support parts. The guide is composed of a plurality of support portions around which the one end portion is fixed in a state where the width direction of the one end portion is aligned with the opening radial direction.
2. The envelope of the light emitting device according to claim 1, wherein the support portion has a width at the other end shorter than a width at the one end, and the gap is defined by an interval between the support portions.