JP2734614B2 - Light emitting diode and light emitting diode lamp - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a light emitting diode and a light emitting diode lamp suitable for front-side radiation.

[Conventional technology]

2. Description of the Related Art Conventionally, light emitting diodes and light emitting diode lamps of various structures have been devised in order to improve the radiation efficiency in the front direction. FIG. 8 is a schematic sectional view of a conventional light emitting diode lamp, and FIG. 9 is a schematic sectional view of the light emitting diode. 8 and 9, reference numeral 50 denotes a light emitting diode, 61 denotes a circuit board, and 62 denotes a light transmitting plate. The light emitting diode 50 is formed by a light emitting element 51, lead frames 52 and 53, a wire 54, and a convex lens portion 55 made of a light transmitting resin.

The light emitting element 51 of the light emitting diode 50 is mounted on the top of one lead frame 52 on which a parabolic reflecting mirror 52a is formed, and is electrically connected to the other lead frame 53 by wires 54. Further, the light emitting element 51 and the upper portions of the lead frames 52 and 53 are covered by convex lens portions 55 formed of a light transmitting resin, and the upper end surface of each convex lens portion 55
55a is formed in the shape of a rotating hyperboloid. The light emitting diodes 50 thus formed are alternately turned by the lead frames 52 and 53 as shown in FIG.
The circuit board 61 is electrically connected via a circuit pattern (not shown) provided on the circuit board 61.

In the light emitting diode lamp configured as described above, a part of the light emitted by the light emitting element 51 of each light emitting diode 50 is refracted via the upper end face 55a of the convex lens portion 55, and the central axis of the upper end face 55a. The light is emitted toward the front surface of the light emitting diode 50 by following an optical path parallel to the light emitting diode 50. Also, the light emitting element
A part of the light emitted by 51 is reflected by a parabolic reflector formed on the lead frame 52 and emitted toward the front of the light emitting diode. Therefore, these lights contribute to the luminous intensity in the front direction of the light emitting diode lamp. And
Since the plurality of light emitting diodes 50 are arranged in two different directions on the circuit board 61, the light distribution characteristic of the light emitting diode lamp is such that the viewing angle in the vertical direction is wider than the viewing angle in the vertical direction, for example. Can be.

[Problems to be solved by the invention]

By the way, in the light emitting diode 50 used in the conventional light emitting diode lamp, most of the light emitted by the light emitting element 51 is emitted in the side direction. Part of this is a parabolic reflector formed on the lead frame 52.
Reflected at 52a.

However, since the light emitting element 51 is larger than the reflecting surface 52a, the light emitting element cannot be regarded as a point light source with respect to the reflecting surface 52a, and the reflected light cannot be sufficiently controlled by the reflecting surface 52a. Therefore, of the light emitted by the light emitting element 51 in the side direction, the light that does not reach the parabolic reflecting mirror 52a formed on the lead frame 52 and the light that is not sufficiently controlled by this reflecting mirror are the light of the light emitting diode lamp. The light is wasted without contributing to the luminous intensity in the front direction. For this reason, the conventional light emitting diode lamp has a disadvantage that the light emission efficiency in the front direction is poor.

Further, in the conventional light emitting diode lamp, since the light emitting diodes 50 are mounted on the circuit board 61 by the lead frames 52 and 53, it is not possible to mount the light emitting diodes 50 in exactly the same direction, which causes a problem in manufacturing. there were.
Also, for this reason, the light emitting diodes 50 arranged in the same direction
However, since the central axes are not parallel, there is a disadvantage that the light distribution characteristics of the light emitting diode lamp vary.

Further, in the conventional light emitting diode lamp, since there is an air layer between the light emitting surface of each light emitting diode (the upper end surface 55a of the convex lens portion 55) and the light transmitting plate 62, for example, the light transmitting plate 62 is refracted. When a glass plate with a ratio of 1.5 is used, the light transmitting plate 6
There is a drawback that about 10% of light loss occurs due to the interface reflection between 2 and the air layer.

The present invention has been made based on the above circumstances, can improve the radiation efficiency of light in the front direction,
Moreover, it is an object of the present invention to provide a light emitting diode and a light emitting diode lamp having a wide viewing angle and a small variation in light distribution characteristics.

[Means for solving the problem]

The present invention for achieving the above object, a light-emitting element,
A lead portion for supplying power to the light emitting element, a concave reflecting surface provided on the light emitting surface side of the light emitting element so as to face the light emitting element, and radiating light reflected by the concave reflecting surface to the outside. A radiating surface, and a light transmitting material that fills a space between the concave reflecting surface and the reflecting surface, and the light emitted by the light emitting element is reflected by the concave reflecting surface and then radiated outside from the radiating surface. In the light emitting diode, the light distribution is different between the X-axis direction and the Y-axis direction of the X and Y orthogonal coordinates perpendicular to the central axis of the concave reflecting surface, and the lead portion does not hinder wide-angle light distribution. It is characterized by being drawn out.

Further, the concave reflecting surface may be formed such that a cut surface formed by a plane perpendicular to the central axis becomes elliptical.

Further, the concave reflecting surface may be formed in a rotating surface shape, and a plurality of the light emitting elements may be arranged at regular intervals on a straight line perpendicular to a central axis of the concave reflecting surface.

Further, the light emitting diode may be a light emitting diode lamp in which the light emitting surface of the light emitting diode is formed in a planar shape, and a plurality of the light emitting diodes are attached such that the light emitting surface is in close contact with the light-transmitting mounting body.

According to the present invention, power is supplied to the light emitting element of the light emitting diode from the external connection portion via the lead frame by the above configuration. Then, the light emitting element emits light, and the light emitted by the light emitting element is reflected by the concave reflecting surface. Therefore, for example, the shape of the concave reflecting surface is formed so as to be a two-lobed hyperboloid, the light emitting element is arranged at the focal point of the reflecting surface, and the lead portion has a wide angle with respect to the central axis of the concave reflecting surface. After the light emitted by the light emitting element is diffused and reflected by the concave reflecting surface by extracting the light in a direction that does not hinder the light distribution, the light distributed at a wide angle is directed forward without being obstructed by the shadow of the lead portion. Radiated. Therefore, the light radiated in the wide angle direction by the concave reflecting surface becomes a diffused light having a wide viewing angle with almost no loss.

By forming the concave reflecting surface so that a cut surface formed by a plane perpendicular to the central axis is elliptical, light distribution may be different between the long axis direction and the short axis direction of the concave reflecting surface. it can.

Further, the concave reflection surface is formed in a rotating surface shape, and a plurality of the light emitting elements are arranged at regular intervals on a straight line perpendicular to the central axis of the concave reflection surface, so that the light emitting element may be changed depending on the radiation direction. And light distribution characteristics can be different.

Further, the light emitting diode is formed by forming the light emitting surface of the light emitting diode in a planar shape and mounting the plurality of light emitting diodes so that the light emitting surface is in close contact with a light-transmitting mounting body. Even when a plurality of light-emitting diodes are mounted on the light-transmitting mounting body, the diode lamp can easily align the central axis of each light-emitting diode in a predetermined direction, and furthermore, between the light-transmitting mounting body and the light-emitting diode. Since there is no gap, light loss due to surface reflection of the light-transmitting mounting body can be prevented.

〔Example〕

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 4. 1 is a schematic sectional view of a light emitting diode lamp according to a first embodiment of the present invention, FIG. 2 is a schematic plan view thereof, FIG. 3 is a schematic enlarged bottom view of a light emitting diode used in the present embodiment, FIG. FIG. 4 is a schematic sectional view and an optical path diagram of light emitted from the light emitting element. 1 to 4, reference numeral 1 denotes a light-emitting diode, 2 denotes a circuit board, and 3 denotes a light-transmitting plate to which the light-emitting diode 1 is attached. The light emitting diode 1 includes a light emitting element 11 and lead frames 12 and 13.
, A wire 14 and a light transmissive material 15 and are formed in a substantially plano-convex lens shape. The light transmitting material 15 is glass,
For example, low melting point glass may be used.

The light emitting element 11 of the light emitting diode 1 is mounted on one lead frame 12, and is electrically connected to the other lead frame 13 by wires 14. The light emitting element 11, the wire 14, and the tips of the lead frames 12, 13 are integrally molded with the light transmitting material 15. As shown in FIG. 3, the lead frames 12 and 13 are drawn at an angle of 45 degrees from the X-axis direction to the Y-axis direction and at an angle of 90 degrees. A lower end surface of the light transmitting material 15 facing the light emitting surface of the light emitting element 11 is formed into a two-lobed hyperboloidal shape having the light emitting element 11 as a focal point, for example, an edge of which is elliptical. Mirror processing by plating or metal deposition using silver or silver, etc., a two-lobe hyperboloid concave reflection surface 15a
Are formed. Further, the upper end surface 15b of the light transmitting material 15
Is a radiation surface formed in a plane perpendicular to the central axis Z. When the concave reflecting surface 15a is plated with metal, it is necessary to insulate the lead frames 12 and 13 in order to prevent a short circuit between the lead frames 12 and 13. The X axis indicates the horizontal axis, the Y axis indicates the vertical axis, and the Z axis indicates the central axis of the concave reflecting surface 15a.

Each light emitting diode 1 formed as described above is attached to the lower surface of the light transmitting plate 3. At this time, the light emitting diodes 1 and the light transmissive plate 3 are joined without any gap by, for example, a transparent adhesive. In addition, lead frame 12
Reference numeral 13 is mounted on the circuit board 2 and is electrically connected via a circuit pattern (not shown) provided on the circuit board 2.

According to the above configuration, power is supplied to each light emitting diode 1 by the circuit board 2 and the lead frames 12 and 13 are connected to the wires.
The power is supplied to the light emitting element 11 of each light emitting diode 1 via. Then, the light emitting element 11 emits light, and the light is reflected by the concave reflecting surface 15a arranged opposite to the light emitting surface of the light emitting element 11.
Is reflected by By the way, the light emitting element 11 is disposed at the focal point of the concave reflecting surface 15a, and the concave reflecting surface 15a is
Since the leaves are formed in a hyperboloidal shape, the optical path of the reflected light is diffused and reflected by the concave reflecting surface 15a in the XZ plane direction as shown by the arrow in FIG. On the other hand, in the direction of the YZ plane, the light is slightly diffused and emitted as shown by the arrow in FIG. 4 (b). The reflected light is emitted toward the front through the light transmitting plate 3. Therefore,
The light emitted from the light emitting element 11 can be effectively used as diffused light having a wide viewing angle with almost no loss.

According to the above-described embodiment, the light emitted from the light emitting element 11 can be efficiently radiated to the front direction by the concave reflecting surface 15a, and the light having low directivity in the XZ plane direction, In the direction of the Z plane, the light can be emitted as light having high directivity. Therefore, for example, by arranging a plurality of light emitting diodes 1 vertically and horizontally as shown in FIG. 2, it is possible to provide a light emitting diode lamp in which the viewing angle in the X-axis direction is wider than the viewing angle in the Y-axis direction.

According to the above embodiment, the lead frames 12 and 13
Is not taken out in the X-axis direction, for example, it is taken out in the direction of 45 degrees with respect to the X-axis, so that the influence of shadows of the lead frames 12 and 13 on light in the X-axis direction with weak directivity should be reduced. Can be. Therefore, it is possible to efficiently radiate the diffused light with a wide viewing angle to the outside without hindering the radiation in the X-axis direction (wide angle direction) having weak directivity.

Further, according to the above embodiment, since the upper end face 15b of the light emitting diode 1 is formed in a flat shape, the flat light transmitting plate 3 is formed on the upper end face 15b by, for example, a bonding surface using a transparent adhesive or the like. Can be joined without mixing an air layer into the substrate. Therefore, it is possible to prevent light loss due to interfacial reflection at the bonding surface. Further, since the central axes of the respective light emitting diodes 1 can be easily aligned, it is possible to provide a light emitting diode lamp with less variation in light distribution characteristics.

In the above embodiment, the lead frames 12 and 13 are approximately 90
Although the description has been made of a case where the lead frame 12 and 13 are pulled out so as not to hinder the emitted light in the axial direction having a wide viewing angle, the drawing direction of the lead frames 12 and 13 may be any direction that does not hinder the wide viewing angle. , For example, in opposite directions, or may be drawn in the same direction.

FIG. 5 is a schematic plan view showing a modification of the first embodiment of the present invention. The light emitting diode of this modification is a plurality of light emitting diodes 1 used in the above embodiment and light emitting diodes 1a in which the concave reflecting surface 15a is different in shape and the viewing angle in the X-axis direction is further increased to be alternately arranged. It is. By arranging the light emitting diodes in this manner, light emitting diode lamps having different light distribution characteristics can be easily manufactured. Other functions and effects are the same as those of the above-described embodiment.

In the above embodiment, the case where the light emitting diode 1 is mounted and fixed on the light transmitting plate 3 has been described. However, the light emitting diode 1 is fixed by being inserted into a holder for setting the position of the light emitting diode 1 or the like. By doing
The light transmissive plate 3 does not necessarily have to be used.

Further, in the above embodiment, the case where the plurality of light emitting diodes 1 are simply arranged on the light transmissive plate 3 has been described. However, the light emitting diode 1, the light transmissive plate 3 and the like are integrally housed in an exterior case or the like. It may be one that is incorporated in another device or the like. At this time, a resin or the like is buried around the light emitting diode 1 and the circuit board 2,
What improved heat dissipation may be sufficient.

Further, in the above-described embodiment, the case where the highly permeable attachment body is formed in a flat plate shape is described, but this may be, for example, a semi-cylindrical shape or a semi-circular shape. Thereby, the light distribution characteristics can be adjusted.

Further, in the above embodiment, the case where a plurality of light emitting diodes 1 are arranged has been described, but one set in which a plurality of light emitting diodes 1 are integrally formed is:
A plurality of sets may be arranged.

Further, in the above embodiment, the upper end surface 15b of the light emitting diode 1 is perpendicular to the central axis Z of the concave reflecting surface 15a (X-Y).
Although the case where it is formed (parallel to a plane) has been described, the upper end surface 15b may be formed, for example, inclined with respect to the X axis. Thereby, for example, the viewing angle with respect to the X-axis direction can be further widened.

In addition, in the above embodiment, the light emitting diodes used may be of different emission colors, and by combining such light emitting diodes, a light emitting diode lamp having a multicolor display function may be provided. Furthermore,
As long as each light emitting diode includes a plurality of light emitting elements, light emitting elements having different emission colors may be used.

In the above embodiment, the case where the lead frames 12 and 13 of the respective light emitting diodes 1 are connected by the circuit board 2 has been described. However, when the wiring of the circuit is not complicated, the circuit board 2 is omitted, and The lead frames 12 and 13 of the light emitting diode 1 are directly connected to each other,
You may make it supply electric power directly to 12 and 13.

FIG. 6 is a schematic bottom view of a light emitting diode according to a second embodiment of the present invention, and FIG. 7 is a schematic sectional view thereof. The second embodiment is different from the light emitting diode of the first embodiment in that the concave reflecting surface is formed as a rotating two-lobe hyperboloid,
The two light emitting elements are arranged on a straight line (X-axis) perpendicular to the central axis Z passing through the focal point of the concave reflecting surface 15a of the concave reflecting surface 15a at predetermined intervals with the focal point of the concave reflecting surface 15a as a symmetric point. It is in the point. 6 and 7, 11a and 11b are light emitting elements, 12a, 12b and 13a are lead frames, 14a and 14b are wires, and 15c is a concave reflecting surface formed into a rotating two-lobe hyperboloid. In the second embodiment shown in FIGS. 6 and 7, those having the same functions as those of the first embodiment shown in FIGS. 1 to 4 are denoted by the same reference numerals, and Detailed description is omitted.

According to the above configuration, the light emitting elements 11a and 11b are arranged at predetermined intervals in the X-axis direction, and the concave reflecting surface 15c is
The light emitted by the light emitting elements 11a and 11b is diffused and reflected by the concave reflecting surface 15c, and the upper end surface 15b
Is emitted to the outside through the light-transmitting plate 3, but the light emitted in the X-axis direction has a wider emission angle range than the light emitted in the Y-axis direction and is diffused and emitted. As described above, according to the second embodiment, similarly to the first embodiment, the light emitted from the light emitting elements 11a and 11b is transmitted to the concave reflecting surface 15a.
c, the light can be more efficiently radiated to the front direction, and as the light having weak directivity in the XZ plane direction,
In the −Z plane direction, the light can be emitted as light having high directivity. Other operations and effects are the same as those of the first embodiment.

In the first embodiment, the case where a plurality of light emitting diodes each having an elliptical two-lobe hyperboloid concave reflecting surface having an elliptical edge is arranged, but the light emitting diode used is the second light emitting diode. The light emitting diode of the embodiment and the light emitting diode of the first embodiment having an elliptical edge may be mutually arranged.

In the first and second embodiments, the case where the concave reflecting surface is formed in a hyperboloidal shape has been described.
The concave reflecting surface may have another parabolic or elliptical shape depending on the light distribution characteristics.

〔The invention's effect〕

As described above, according to the present invention, the light emitted from the light emitting element is reflected by the concave reflecting surface so that the viewing angle in a specific direction is widened, and then emitted toward the front, and the lead portion has a wide angle. Since the light is drawn in a direction that does not hinder the light distribution in the direction, it is possible to provide a light emitting diode and a light emitting diode lamp that have a wide viewing angle and can improve radiation efficiency in a wide angle direction.

[Brief description of the drawings]

1 is a schematic sectional view of a light emitting diode lamp according to a first embodiment of the present invention, FIG. 2 is a schematic plan view thereof, FIG. 3 is a schematic enlarged bottom view of a light emitting diode used in the present embodiment,
FIG. 4 is a schematic cross-sectional view and an optical path diagram of light emitted from the light emitting element, FIG. 5 is a schematic plan view showing a modification of the first embodiment of the present invention, and FIG. 6 is a second embodiment of the present invention. FIG. 7 is a schematic sectional view of a conventional light emitting diode lamp, and FIG. 9 is a schematic sectional view of the light emitting diode. 1. Light-emitting diode 2. Circuit board 3. Light-transmitting plate 11.11a / 11b Light-emitting element 12.12a / 12b / 13.13a
Lead frame, 14 / 14a / 14b ... wire, 15 ... light transmissive resin, 15a / 15c ... concave reflective surface, 15b ... radiation surface.

Claims (4)

(57) [Claims] A light-emitting element; a lead portion for supplying power to the light-emitting element; a concave reflecting surface provided on a light-emitting surface side of the light-emitting element so as to face the light-emitting element; A radiation surface that radiates light reflected at the outside, and a light transmitting material that fills a space between the concave reflection surface and the reflection surface,
After reflecting the light emitted by the light emitting element on the concave reflecting surface, the light emitting diode emits light from the emitting surface to the outside, and the X-axis direction of the X and Y orthogonal coordinates perpendicular to the central axis of the concave reflecting surface. The light emitting diode is characterized in that the light distribution is different in the Y-axis direction, and the lead portion is drawn out in a direction that does not hinder wide-angle light distribution. 2. The light emitting diode according to claim 1, wherein the concave reflecting surface has an elliptical cut surface formed by a plane perpendicular to a central axis thereof. 3. The concave reflecting surface is formed as a rotating surface.
And a plurality of the light-emitting elements are arranged at regular intervals on a straight line perpendicular to a central axis of the concave reflecting surface.
A light-emitting diode as described. 4. The light-emitting diode according to claim 1, wherein the light-emitting diode is formed in a planar shape, and a plurality of the light-emitting diodes are attached so that the light-emitting surface is in close contact with the light-transmitting mount. A light-emitting diode lamp according to any one of the above.