JP2554628Y2 - Daymer control device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dimmer control device for adjusting the illuminance of a vehicle-mounted panel.

[0002]

2. Description of the Related Art FIGS. 3 and 4 are explanatory views of a conventional dimmer control device. FIG. 3 is a plan view, and FIG.
It is sectional drawing of the A line.

In these figures, reference numeral 1 denotes a circuit board, 2 denotes a circuit element mounted on the board 1, and 3 denotes a circuit element 2 on the circuit board 1 which is fixed to the circuit board 1 by mounting legs 4 so as to cover the circuit element 2. The heat radiating plate 5 is a light guide made of an insulator mounted on the circuit board 1 and includes a white upper wall 5a, a side wall 5b, and a rear wall 5c. After the mounting leg 6 is inserted into the mounting hole 7 of the circuit board 1, the tip is fixed by heat staking. 8 is the upper wall 5a, the side wall 5b,
A lamp 9 enclosed by the rear wall 5c and mounted on the socket 8a on the circuit board 1 is a knob for circuit adjustment mounted on the circuit board 1.

The above-described components such as the light guide 5 and the heat radiating plate 3 are assembled as a single unit on the circuit board 1 and then housed in a case 10.
And a part of the knob 9 is exposed from the lid 11, and the lamp 8 faces a display window 12 provided on the lid 11. Reference numeral 13 denotes a through-hole provided on the front surface of the display window 12.

The rotation of the knob 9 adjusts the illuminance of the dimmer control device, and the light of the lamp 8 is reflected by the upper wall 5a, the side wall 5b, and the rear wall 5c of the light guide 5, and moves toward the display window 12. The vehicle travels straight, passes through the light transmitting body 13 and passes outward, so that the position of the knob 9 can be confirmed even at night.

[0006]

The light guide 5 is attached to the circuit board 1 by inserting the tip of the attachment leg 6 into the attachment hole 7 of the circuit board 1 as described above. Since it is fixed by caulking, an inspection of the caulking state and management of the caulking temperature are necessary for mounting without looseness by vibration, and there is a problem that workability is poor and cost is increased.

SUMMARY OF THE INVENTION The present invention is to solve the above-mentioned conventional problems, and an object of the present invention is to easily attach a light guide to a circuit board, and to cause backlash due to vibration after the attachment. It is an object of the present invention to provide a dimmer control device that can be securely fixed without any problem.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a light source fixed to a circuit board on which circuit elements are mounted, and a light source fixed to the circuit board, and A light guide that reflects the light to the display window, a heat radiator mounted on a circuit board and radiating heat generated from the circuit element, and a dimmer control device having a knob for circuit adjustment; An extension is provided on a part of the face plate to reach the upper wall of the light guide, and the extension presses the upper wall of the light guide.

[0009]

According to the above construction, in one operation of fixing a heat sink provided with an extension extending in advance on the upper surface of the light guide onto the circuit board, the extension is simultaneously positioned at a predetermined position on the upper wall of the light guide. Is pressed in the direction of the circuit board, so that the light guide is securely positioned and fixed without any play due to the mounting leg at the tip thereof.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a plan view, and FIG. 2 is a sectional view taken along the line BB of FIG. Note that the same parts as those of the conventional example shown in FIGS. 3 and 4 are denoted by the same reference numerals, and redundant description will be omitted.

The difference between the present invention and the conventional device lies in the structure for attaching the light guide 5 to the circuit board 1. This will be described in detail below.

The light guide 5 includes an upper wall 5a, a side wall 5b, and a rear wall 5c.
At the ends of the side wall 5b and the rear wall 5c, three mounting legs 6 are provided, and on the upper wall 5a of the light guide 5,
A projection 14 is provided at a position above the center of gravity of a portion surrounded by the three mounting legs 6, while the heat sink 3 reaches the upper wall 5 a of the light guide 5 from one end of the upper surface plate 15. Extension 1
6 are provided. In order to fix the light guide 5 to the circuit board 1, in a state where the three mounting legs 6 of the light guide 5 are inserted into the mounting holes 7 of the circuit board 1, the mounting legs 4 of the heat sink 3 are attached. What is necessary is just to crimp on the circuit board 1.

In this manner, the extension 16 of the heat sink 3 presses the projection 14 provided on the upper wall 5a of the light guide 5 downward (toward the circuit board 1), and the side wall 5b of the light guide 5 The end of the rear wall 5c is pressed against the circuit board 1, and the light guide 5 is positioned and fixed at a predetermined position on the circuit board 1.

The mounting of the light guide 5 of the present invention on the circuit board 1 has the above-described configuration. According to the present invention, the light guide 5 is extended to reach the upper wall 5a of the light guide 5 in advance. In addition to providing the projection 16, the projection 1 is provided at a predetermined position on the upper wall 5 a of the light guide 5.
If the mounting legs 4 are provided, the mounting legs 6 of the light guide 5 are inserted into the mounting holes 7 of the circuit board 1, and the mounting legs 4 of the heat sink 3 are simply swaged to the circuit board 1. 5 can be positioned at a predetermined position of the circuit board 1 and can be securely fixed without causing backlash due to vibration.

Therefore, the crimping state inspection step and the crimping temperature management which are conventionally required are not required, and the circuit board 1 of the light guide 5 is formed by one operation of crimping the heat sink 3 to the circuit board 1. Since it can be fixed at the same time, the work efficiency can be improved and the cost can be reduced as compared with the related art.

As shown in FIGS. 1 and 2, the light guide 5
By providing the skirt portion 17 on the peripheral edges of the end portions of the side wall 5b and the rear wall 5c, the gap generated between the end portions of the side wall 5b and the rear wall 5c and the surface of the circuit board 1 can be completely closed,
Unnecessary light from the lamp 8 can be prevented from leaking to the outside.

[0018]

As described above, according to the present invention, the circuit board of the light guide is pressed by pressing a predetermined position of the upper wall of the light guide with the extension provided on a part of the heat sink. It is possible to perform positioning and secure fixing, and it is possible to omit the inspection process of the caulking state and management of the caulking temperature required when fixing by the conventional heat caulking, so the work efficiency is improved compared to the past, This has the effect of reducing costs.

[Brief description of the drawings]

FIG. 1 is a plan view of the dimmer control device of the present invention.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a plan view of a conventional dimmer control device.

FIG. 4 is a sectional view taken along line AA of FIG. 3;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circuit board 2 Circuit element 3 Heat sink 5 Light guide 5a Upper wall 8 Light source (lamp) 9 Knob 12 Display window 14 Projection 16 Extension

Claims (1)

(57) [Scope of request for utility model registration] A light source fixed to a circuit board on which a circuit element is mounted, a light guide positioned and fixed to the circuit board, and reflecting the light of the light source to guide it to a display window; A radiator for radiating heat generated from the circuit element, and a dimmer control device having a knob for circuit adjustment, a part of an upper plate of the radiator, an extension reaching the upper wall of the light guide. A dimmer control device, wherein the upper portion of the light guide is pressed by the extension.