JP2003249685A - Holder for light emitting element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a circuit board fitting type light emitting element holder capable of effectively preventing a light emitting element such as an LED from back leakage light. <P>SOLUTION: The holder is provided with a bottom 11 integrally formed by molding a plastic material having elasticity, a back leakage light preventing wall l2 erected from the bottom 11, a pair of elastic holding hooks 14A, 14B oppositely erected from the bottom 11, and fixing legs 15 for fixing a circuit board 30 pendent from the bottom 11 to fixing holes. The wall 12 is formed like a C-shape practically covering the rear face of the light emitting element 20, and has insertion grooves 13 for inserting lead wires 21A, 21B of the light emitting element 20. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a holder, for example, a holder for a light emitting element that holds the light emitting element at a predetermined position on a circuit board or the like.

[0002]

2. Description of the Related Art A light emitting element such as a light emitting diode (LED) or a laser diode (LD) is an electro-optical converter that outputs light by passing (inputting) a current. Such a light emitting element is widely used as an indicator (indicator or display), various sensors, etc. in electronic devices or electronic application devices.

In order to arrange such a light emitting element in an electronic device or an electronic device and control lighting, extinction or blinking by a driving circuit, it is generally held at a predetermined position on a circuit board.
For that purpose, a holder that is self-supportingly attached to the circuit board is used. Such a holder is generally formed by a plastic mold (molded product). That is, the light emitting element is soldered to the circuit board while being held by the holder that is attached to the circuit board in a self-supporting manner, and is driven and controlled by the drive circuit.

A conventional example of such a holder for a light emitting device is, for example, "LED holder, Japanese Patent Laid-Open No. 9-231486.
Optical base and photoelectric smoke detector using these ". FIG. 3 is a side view of such a conventional light emitting element holder (hereinafter, also referred to as “LED holder” in some cases). This LED holder 1 is composed of a holder body 1d, a leg portion 1f, a hook portion 1e of the leg portion, an LED insertion opening 1a, a light emitting hole 1b and an LED insertion hole portion 1c, and an LED 2 having a plurality of lead wires 2a. Is L of the holder body 1d
The ED insertion hole 1c is inserted and fixed (held) from the left side to the right side in the drawing. The LED holder 1 is fixed to the circuit board 4, and the lead wire 2a of the LED 2 is inserted into the through hole of the circuit board 4 and soldered.

A drive circuit (not shown) is formed on the circuit board 4 so as to control the LED 2 to be turned on, turned off or blinked. By using such an LED holder 1, the LED 2 is held in a predetermined position with respect to the circuit board 4,
It is possible to emit the output light in a predetermined direction.

[0006]

Next, the problems of the conventional holder for a light emitting device as described above will be described with reference to FIGS. 4 (A) to 4 (C). FIG. 4A is a simplified cross-sectional view showing the relationship between the conventional holder 1, LED 2 and circuit board 4 as shown in FIG. LE, which is the light emitting part of the LED 2 as shown in the figure
When the D body is inserted into the LED insertion hole portion 1c from one side and held, the light emitting portion of the LED 2 is substantially surrounded, and thus it is possible to emit light in a predetermined direction. However, FIG.
As indicated by the diagonal lines in (B), rear leak light leaking to the rear of the LED 2 is diffused. Since such backward leakage light is often undesirable, it is necessary to prevent it by some means.
Therefore, for example, as shown in FIG. 4C, it is necessary to provide a light shielding rib 6 for preventing rear leakage light on the panel 5 or the like for fixing the circuit board 4 (or on the circuit board 4 itself).

Such a light-shielding rib 6 not only requires an additional component arranged in a predetermined positional relationship with the LED holder 1, but also occupies a relatively large space. Therefore, not only does the cost increase due to the additional parts and the management and assembly thereof, but also a dead space is generated, which becomes a factor to prevent miniaturization of the electronic device or the electronic application device.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and provides a holder for a light emitting element which can easily prevent or shield rear leakage light of the light emitting element without providing additional parts. The purpose is to provide.

[0009]

In order to solve the above-mentioned problems, the holder for a light emitting device according to the present invention has the following characteristic structure.

(1) In a holder for a light emitting element, which is drivably connected by a drive circuit provided on a circuit board and is held substantially parallel to the surface of the circuit board, rear leak light leaking from the rear of the light emitting element. A light emitting element holder integrally provided with a rear leakage light prevention wall for preventing light.

(2) The rear leak light prevention wall is formed so as to substantially cover the rear surface of the light emitting device.
Holder for light emitting device.

(3) The holder for a light emitting device according to the above (1) or (2), wherein a groove or an opening for inserting a lead wire of the light emitting device is formed in the rear leak light prevention wall.

(4) The holder for a light emitting element according to the above (1), (2) or (3), which further has at least one pair of elastic holding hooks integrally formed and holds the main body of the light emitting element.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION The structure and operation of a preferred embodiment of a holder for a light emitting device according to the present invention will be described in detail below with reference to the accompanying drawings.

First, FIG. 1 shows a preferred embodiment of a holder for a light emitting device according to the present invention. FIG. 1 (A) is a plan view of the light emitting element holder 10, and FIG. 1 (B) is a side view seen from the direction of arrow B in FIG. 1 (A). The light emitting element holder 10 is preferably integrally molded with a suitable light-impermeable engineering plastic material having sufficient elasticity.

This light-emitting element holder 10 has a bottom surface (or base) 11 arranged in contact with the surface of a circuit board (not shown in FIG. 1), and a substantially C standing upright from the bottom surface 11.
(Or U-shaped) rear leakage light prevention wall 12 and bottom surface 11
A pair of elastic holding hooks 14 standing up from opposite sides of the
A-14B. The rear leakage light prevention wall 12 is formed with a pair of grooves 13 through which a pair of lead wires 21A-21B (described later) of the light emitting element 20 are inserted. Also, the bottom surface 11
A fixed position (direction) of the pair of elastic fixing legs 15 that hang down from substantially the center and the light emitting element holder 10 formed at the ends
It has a decision boss 16.

The light emitting element holder 10 is self-supportingly mounted on a circuit board having two openings.
One of the two openings of the circuit board is a relatively large mounting hole into which the pair of fixing legs 15 of the light emitting element holder 10 are inserted. The other opening is relatively small and the positioning boss 1
6 is inserted to define the mounting direction of the light emitting element holder 10 to the circuit board. As is apparent from FIGS. 1B and 1C, the pair of fixed legs 15 are formed to face each other with a sufficient distance, and have a protruding portion on the outer side. When inserting the fixed leg 15 of the light emitting element holder 10 into the mounting hole of the circuit board,
The outer protrusion contacts the inner wall of the mounting hole to flex the fixed legs 15 inward. However, when the fixing leg 15 is completely inserted into the mounting hole of the circuit board, the fixing leg 15 is elastically restored so that the end of the projecting portion engages with the outer edge of the mounting hole of the circuit board, so that the light emitting element holder 10 is mounted on the circuit board. Is fixed in a predetermined position and in a predetermined direction.

In FIG. 1C, the light emitting element holder 10 has an L
FIG. 6 is an enlarged view showing a state in which a light emitting element 20 such as an ED is held. That is, FIG. 1C is a side view of the light emitting element holder 10 shown in FIG. As shown in the figure, the main body of the light emitting device 20 includes a bottom surface 11 of the light emitting device holder 10 and a pair of elastic holding hooks 14A.
Securely held by -14B.

Next, FIG. 2 is an explanatory view showing the relationship among the light emitting element holder 10, the light emitting element 20 and the circuit 30 according to the present invention. FIG. 2A shows a light emitting element holder 10 and a light emitting element 20 held by the light emitting element holder 10.
FIG. 3 is a top view showing a state in which is fixed to the circuit board 30.
As shown, the lead wires 21A-21B of the light emitting element 20
Is bent at a substantially right angle outside the rear leak light prevention wall 12 and inserted into the through hole 31 of the circuit board.

FIG. 2B is a view of the light emitting element 20 held by the light emitting element holder 10 as seen from the rear side. As shown in the figure, the height of the rear leakage light prevention wall 12 of the light emitting element holder 10 is substantially equal to the diameter of the rear end portion of the light emitting element 20. In addition, the lead wires 21A-21B of the light emitting element 20 are
It is inserted into the groove 13 formed in the rear leak light prevention wall 12. With such a configuration, the rear end of the light emitting element 20 substantially covers the rear end of the light emitting element holder 10. Therefore, the rear leakage light of the light emitting element 20 is substantially blocked by the rear leakage light prevention wall 12 of the light emitting element holder 10.

FIG. 2C shows a holder 10 for a light emitting element.
And circuit board 30 of light emitting element 20 held by this
FIG. 3 is a cross-sectional view of a step parallel to the plane of FIG. As shown by an arrow P in the figure, the main body of the light emitting element 20 has an elastic holding hook 14A.
It is elastically held by -14B. In addition, the light emitting element 2
In order to hold 0 in the light emitting element holder 10, the light emitting element 2
All that is required is to align the 0 lead wire 21A-21B with the groove 13 and push the body between the pair of elastic retaining hooks 14A-14B.

The configuration and operation of the preferred embodiment of the holder for a light emitting device according to the present invention have been described above in detail. However, such an embodiment is merely an example of the present invention and does not limit the present invention in any way. Those skilled in the art can easily understand that various modifications and changes can be made according to a specific application without departing from the scope of the present invention. For example, in the above-mentioned embodiment, the light emitting element holder for holding one light emitting element such as an LED having a pair of lead wires has been described. However, the invention can also be applied to a holder of a light emitting element including two or more light emitting elements of the same or different emission colors, with necessary modifications. Further, by making the inner surface of the rear leakage light prevention wall a mirror surface or a light reflecting surface, it is possible to reflect the rear leakage light of the light emitting element to the front and use the rear leakage light of the light emitting element.

[0023]

As can be understood from the above description, the holder for a light emitting device of the present invention has the following notable practical effects. That is, it is possible to effectively prevent the backward leakage light of the light emitting element. Further, since it is not necessary to provide a separate light-shielding rib or the like, it is possible to reduce costs and eliminate dead spaces and the like. Furthermore, by making the inner surface of the rear leak light prevention wall a reflective surface, it is possible to positively utilize the rear leak light.

[Brief description of drawings]

FIG. 1 is a view showing a preferred embodiment of a holder for a light emitting device according to the present invention.

FIG. 2 is a diagram showing the relationship between the light emitting element holder, the light emitting element, and the circuit board shown in FIG.

FIG. 3 is a configuration diagram of a conventional LED holder.

FIG. 4 is a diagram illustrating a problem of a conventional LED holder.

[Explanation of symbols]

10 Light emitting element holder 11 Bottom 12 Back leakage light prevention wall 13 Lead wire insertion groove 14 Elastic holding hook 15 Fixed leg 20 light emitting element 21 Lead wire of light emitting element 30 circuit board

Claims (4)

[Claims] 1. A holder for a light emitting element, which is drivably connected by a drive circuit provided on a circuit board and is held substantially parallel to the surface of the circuit board, wherein rear leakage light leaking from the rear of the light emitting element is prevented. A light emitting element holder, characterized in that a rear leak light prevention wall for preventing light leakage is integrally provided. 2. The holder for a light emitting device according to claim 1, wherein the rear leak light prevention wall is formed to substantially cover a rear surface of the light emitting device. 3. The holder for a light emitting device according to claim 1, wherein the rear leakage light prevention wall is formed with a groove or an opening through which a lead wire of the light emitting device is inserted. 4. The holder for a light emitting element according to claim 1, further comprising at least one pair of elastic holding hooks formed integrally with each other to hold the main body of the light emitting element therebetween.