JP2582096Y2 - Light emitting diode lamp - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting diode lamp using a plurality of light emitting diodes having different emission colors.

[0002]

2. Description of the Related Art In recent years, many improvements have been made to light-emitting diode lamps using light-emitting diodes having different emission colors. Among them, for example, the present applicant has disclosed in
A light emitting diode lamp disclosed in Japanese Patent No. 7569 is shown in a perspective view of FIG. 7 and a sectional view of FIG. In these figures,
The base 31 is made of a metal plate and has a mounting surface and a notch 32 on the upper surface.
And 33 are formed. On the mounting surface, blue light emitting diodes 34, 34, green light emitting diode 35, and red light emitting diode 36 are fixed. A total of six pins are fixed in the notches 32 and 33 with a glass sealant, and each pin is wired to the mounting surface and each light emitting diode. The sealing portion 37 covers each light emitting diode and the base 31.
Is provided. Each light emitting diode is wired with a common cathode.

[0003]

However, the above-mentioned light emitting diode lamp has a disadvantage that the mixing of the luminescent colors is insufficient. The present inventor has investigated the cause, and found that the side surface of the blue light emitting diode 34 is inclined at about 45 degrees with respect to the line connecting the blue light emitting diodes. Therefore, the light emitted in the horizontal direction from the blue light emitting diode 34 is blocked by the green and red light emitting diodes 35 and 36, and only one of the emitted colors becomes strong. Therefore, the color mixing is poor below the light emitting diode lamp. Therefore, when each light emitting diode emits light to display white, as shown in FIG. 8C, only a narrow area of about ± 30 ° at the vertex is displayed, resulting in poor display quality.

[0004] Therefore, the present invention solves such a drawback and provides a light emitting diode lamp with good color mixing as a whole.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of first light-emitting diodes having low luminous efficiency, provided substantially symmetrically with respect to the center of a mounting surface.
The second and third light emitting diodes, which are provided substantially orthogonal to the line connecting the light emitting diodes and are substantially symmetric with respect to the center of the mounting surface, have different emission colors from the first light emitting diode, and have high luminous efficiency, And a sealing portion that covers at least the periphery of the light emitting diode. One side surface of the first light emitting diode is substantially orthogonal to a line connecting the light emitting diodes, and
One side surface of the third light emitting diode is provided so as to be substantially orthogonal to a line connecting the light emitting diodes.

[0006]

As described above, according to the present invention, the first light emitting diodes are arranged such that the side surfaces thereof are substantially perpendicular to the lines connecting the light emitting diodes, and are arranged on a line substantially perpendicular to the line connecting the first light emitting diodes. First and second light emitting diodes are arranged. Therefore, light emitted in the lateral direction from the first light emitting diode having low luminous efficiency is not blocked by the second and third light emitting diodes, so that the light is maintained at high luminance. Therefore, mixing of colors is improved even on the lower side of the light emitting diode lamp.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a plan view of a light emitting diode lamp according to the present embodiment, and FIG. 2 is a cross-sectional view taken along the line AA of FIG.
In these figures, the lead frame 1 is made of a metal plate such as an iron plate, and the lead tongue pieces 2, 3 and
4 and 5, and the other end is formed by press working so as to have terminal portions 6, 7, 8, and 9 bent at substantially right angles to these lead tongue pieces.

The molding resin 10 is made of lead tongue pieces 2, 3, 4, 5,
And molded integrally with a piston or the like using a thermoplastic resin such as polyethylene, polystyrene or ABS, or formed by transfer molding using a thermosetting resin such as epoxy or polyester. Things. The molding resin 10 is formed so as to have a concave cross section open upward, and the lead tongue pieces 2, 3, 4, and 5 are exposed inside the concave portion.

The first light emitting diodes 11 and 12 are blue light emitting diodes made of, for example, silicon carbide (SiC), are fixed on the exposed lead tongue 2 via a silver paste or the like, and are connected to the lead tongue 5 by a thin metal wire. It is wired to. The second light emitting diode 13 is made of, for example, gallium phosphide (GaP) and emits red light having a wavelength of about 700 nm. The second light emitting diode 13 is fixed on the exposed lead tongue 3 and wired to the lead tongue 5. The third light emitting diode 14 is made of, for example, gallium phosphide (GaP),
The light emitting diode emits green light having a wavelength of about 560 nm, and is fixed on the exposed lead tongue 4 and wired to the lead tongue 5. Since the first light emitting diodes 11 and 12 have lower luminous efficiency than the second and third light emitting diodes 13 and 14, two first light emitting diodes 11 and 12 are used to make the luminance of each luminescent color uniform.

The sealing portion 15 is made of, for example, a translucent resin such as an epoxy resin, and covers at least the first, second, and third light emitting diodes 11, 12, 13, and 14 so that the tip has a dome shape. Is formed. Desirably, a resin 16 is provided so as to cover each of the light emitting diodes 11, 12, 13, and 14 and to fill the concave portion of the molding resin 10. The resin 16 is, for example, an epoxy resin mixed with a diffusing agent such as silica gel at a relatively high density. And the sealing portion 15
May be mixed with a relatively low-density diffusing agent. By doing so, monochromatic light from each light emitting diode is well diffused by a high-density diffusing agent near the light emitting source, so that color mixing is improved.

As described above, in this embodiment, the lead tongues 2, 3, 4, 5 of the lead frame 1 and the molding resin 10 are integrally molded. Wiring of light emitting diode lamps in one process,
Because it can be assembled, it can be manufactured by an automatic machine. Therefore, it is easy to manufacture and the manufacturing time per unit is shortened, so that the cost is reduced.

The first light-emitting efficiency having a low luminous efficiency is substantially symmetric with respect to the center of the concave portion of the molding resin 10, that is, the center 17 of the mounting surface.
The light emitting diodes 11 and 12 are arranged such that one side surface of each of the light emitting diodes 11 and 12 is substantially orthogonal to a line connecting the light emitting diodes. The second and third light emitting diodes 13 and 14 having high luminous efficiency are arranged substantially orthogonally to the line connecting the first light emitting diodes 11 and 12 and substantially symmetrically at the center 17 of the mounting surface. One side surface of each of the second and third light emitting diodes 13 and 14 is disposed so as to be substantially orthogonal to a line connecting the light emitting diodes.

By arranging in this manner, light emitted laterally from the first light emitting diodes 11 and 12 having low luminous efficiency is not blocked by the second and third light emitting diodes 13 and 14 and is high. Brightness is maintained. For this reason, the manner of mixing colors is improved even on the lower side of the light emitting diode lamp. Therefore, for example, when each light emitting diode emits light to display white, the white portion is displayed in a wide area of the vertex ± about 50 ° as shown by B, so that the display quality is good.

Further, each of the light emitting diodes 11, 12, 13,
Reference numeral 14 is wired with the anode (anode) shared as shown in the electric circuit diagram of FIG. This is because a suction-type MOS transistor is connected to the cathode of each light-emitting diode, but the suction-type transistor is more general-purpose and has a higher degree of freedom in selecting components. Also, the suction type is lower in cost than the extrusion type.

Next, the manufacture of the light emitting diode lamp of this embodiment will be described with reference to FIGS. As shown in FIG. 4, lead tongue pieces 2, 3, 4, and 5 separated from each other are formed inside the lead frame 1. A plurality of molding resins 10 are provided integrally with each lead tongue. Light emitting diodes 11, 12, 13, 14 are fixed and wired on each lead tongue.

Next, as shown in FIG. 5, a resin 20 is poured into a plurality of containers 19 provided in a casting case 18. The lead frame 1 bent at a predetermined position 21 on the extension of the lead tongue pieces 2, 3, 4, 5 is lowered so that the molding resin 10 is inserted into the container 19. Then, the resin is cured by heating to about 100 to 125 ° C., and the sealing portion 15 is formed around the molding resin 10. Thereafter, the lead frame 1 is lifted, and the lead frame 1 is cut at a predetermined position, thereby completing a light emitting diode lamp.

Next, a light emitting diode lamp according to a second embodiment of the present invention will be described with reference to the sectional view of FIG. The bottom of the molding resin 22 is formed relatively thick. The bottom surface of the sealing portion 23 is formed so as to be located above the bottom surface 24 of the molding resin 22. Other components are the same as those of the light emitting diode lamp of the first embodiment. When this light emitting diode lamp is mounted on the circuit board 25,
Often, the bottom surface of the lamp is placed in contact with the surface of the lamp. Since the bottom surface of the sealing portion 23 is formed by potting, the unevenness of the bottom surface is large, so that it is difficult to maintain the parallelism with the light emitting diode. On the other hand, since the bottom surface 24 of the molding resin 22 has few irregularities and is integrally formed with the lead tongues 2, 3, and 4, the bottom surface 24 of the molding resin is easily maintained in a position parallel to the lead tongue. Therefore, the light emitting diode lamp is maintained at a position substantially perpendicular to the circuit board 25, and the center direction of light emission is easily maintained substantially perpendicular to the circuit board 25.

[0018]

As described above, according to the present invention, the first light emitting diode is arranged so that the side surface thereof is substantially perpendicular to the line connecting the light emitting diodes, and substantially perpendicular to the line connecting the first light emitting diodes. The second and third light emitting diodes are arranged on the line. Therefore, the light emitted laterally from the plurality of first light-emitting diodes having low luminous efficiency is not blocked by the second and third light-emitting diodes, and the light is maintained at a high luminance. The color mixing becomes better on the side. Therefore, when each light emitting diode emits light to display white, the white portion is displayed in a wide area having a vertex of about ± 50 °, and the display quality is good.

According to the present invention, a light emitting diode having a different emission color is mounted on the lead tongue in the concave portion of the molding resin. Therefore, the monochromatic light from each light emitting diode is reflected by the reflection frame formed of the concave portion of the molding resin near the light emitting source and is mixed with each other, so that a color with good mixing can be exhibited. By covering the periphery of the light-emitting diode with a sealing portion containing a high-concentration diffusing agent, monochromatic light is diffused near the light-emitting source, so that the color mixing is further improved, for example, the area of the white display portion is further expanded. .

[Brief description of the drawings]

FIG. 1 is a plan view of a light emitting diode lamp according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is an electric circuit diagram of the light emitting diode lamp according to the first embodiment of the present invention.

FIG. 4 is a view illustrating a manufacturing process of the light emitting diode lamp according to the first embodiment of the present invention.

FIG. 5 is a view illustrating a manufacturing process of the light emitting diode lamp according to the first embodiment of the present invention.

FIG. 6 is a sectional view of a light emitting diode lamp according to a second embodiment of the present invention.

FIG. 7 is a perspective view of a conventional light emitting diode lamp.

FIG. 8 is a sectional view of a conventional light emitting diode lamp.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lead frame 2, 3, 4, 5 Lead tongue piece 10 Molded resin 11, 12 First light emitting diode 13 Second light emitting diode 14 Third light emitting diode 15 Sealing part

Continuation of the front page (56) References JP-A-62-39081 (JP, A) JP-A-4-32890 (JP, A) JP-A-4-137772 (JP, A) JP-A-4-59168 (JP) , U) Japanese Utility Model Showa 51-83277 (JP, U) Japanese Utility Model Showa 60-52643 (JP, U) Japanese Utility Model Showa 5-21458 (JP, U) (58) Fields surveyed (Int. Cl. ⁶ , DB Name) H01L 33/00

Claims (1)

(57) [Scope of request for utility model registration] A plurality of first light emitting diodes having low luminous efficiency provided substantially symmetrically with respect to a center of the mounting surface; and a mounting surface substantially orthogonal to a line connecting the first light emitting diodes. A second light-emitting diode, which is provided substantially symmetrically with respect to the center of the light-emitting diode and has a different emission color from the first light-emitting diode and has a high luminous efficiency
A third light-emitting diode; and a sealing portion covering at least a periphery of the light-emitting diode. One side surface of the first light-emitting diode is substantially orthogonal to a line connecting the light-emitting diodes and the second and third light-emitting diodes. A side surface of the light emitting diode is substantially orthogonal to a line connecting the light emitting diodes.