JPS61208708A - Illumination type push button switch - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of the Invention The present invention relates to an illuminated push button switch that is disposed on, for example, a dash board of an automobile and is used for various operation commands.

(B) Background of the Invention Conventionally, in an illuminated push button switch formed to emit light using an illuminating element such as an LED, the above-mentioned LED
In order to limit the current flowing to the pushbutton switch, a current limiting resistor is connected to the substrate, for example, outside the push button switch.

Therefore, when installing a pushbutton switch on an operation panel, etc., it is necessary to connect a current limiting resistor to the board outside the switch in addition to wiring to the switch, which reduces wiring work efficiency. It had some bad problems.

(c) Purpose of the Invention The purpose of the present invention is to provide an illuminated push button switch that can improve wiring workability when installing the switch by arranging a current limiting resistor inside the switch. shall be.

(D) Summary of the Invention This invention provides a lighting device in which a current limiting resistor is interposed between a lead terminal of a lighting element located inside a switch and a pressure contact terminal inside the switch connected to the lead terminal. It is characterized by being a type push button switch.

(E) Effects of the Invention According to this invention, a resistor for current limiting is interposed between the above-mentioned lead terminal and pressure contact terminal inside the switch, so that when the switch is installed, This eliminates the need to separately connect the resistor to a substrate, etc., and has the effect of improving wiring workability.

(f) Examples of the invention An embodiment of the present invention will be described in detail below based on the drawings.

The drawings show an illuminated pushbutton switch, and in FIG. 1, 1 is a pushbutton unit, 2 is an LED holder unit, 3 is a switch base unit, and 4 is a bottomed rectangular cylindrical switch housing made of synthetic resin.

The above-mentioned push button unit 1 includes a push button 5 made of synthetic resin, and a transparent or milky white thin resin plate attached to the central opening 6 of the push button 5 by adhesive means as shown in FIGS. 2 to 4. It is formed from a diffuser plate 7 and a symbol filter 8.

Further, semi-cylindrical plate spring mounting legs 9, 9 are integrally formed on the lower surface of the longitudinal center of the push button 5, and these mounting legs 9 are integrally formed.
．． A metal plate spring 10, which will be described later, is fixed to the lower end of 9 by thermal caulking means made of resin.

Furthermore, engaging claws 13.13 are integrally formed at symmetrical positions on the lower surface corners of the push button 5, and these engaging claws 13.13 are integrally formed.
13 is engaged with a locking portion 12.12 of the LED holder 11, which will be described later, so as to be able to move up and down as shown in FIG.

The aforementioned LED holder unit 2 is formed from an LED 14 for operation display as a lighting element, an LED 15 for night illumination as a lighting element, and an LED holder 11 made of synthetic resin.

This LED holder 11 has an LED storage wall 1 in the center of its upper surface.
6 is provided protrudingly, and the above-mentioned LED 14.1 is mounted on this storage wall 16.
5, and a recess 17 in the longitudinal center of the holder 11 for inserting the aforementioned plate spring mounting legs 9, 9.
．． 17 is formed.

Furthermore, engaging claws 18 and 18 are integrally formed at symmetrical positions on the lower surface corners of the LED holder 11, and these engaging claws 18 and 18 are integrally formed.
．． Locking portion 21.2 of the switch base 20, 18 of which will be described later.
1 as shown in FIG.

As shown in FIG. 1, the aforementioned LEDs 14 and 15 each have a pair (7) of IJ-domain terminals 14a, 14b, and 15a.

As shown in FIG. 5, the bent portion of one of the lead terminals 14a, 15a on the anode side in the above-mentioned LED holder 11 has a vertical concave engagement groove 40 and a lower mounting table. 41 and a vertical partition wall 43 having a mounting portion 42 on the lower surface thereof.

Then, each of the above-mentioned holding parts 44.45 has a chopper ED14.1.
Resistors 46 and 46 for current limiting are inserted and held as shown in Figure 6.

As shown in FIG. 5 and FIG. 6, the above-mentioned resistor 46 has a printed resistor 48 placed at the center of one side of a rectangular thin plate-shaped substrate 47,
A metal conductive piece 49 is provided bent in an inverted shape from the other side of the board 47 toward one side, and the conductive piece 49 and the printed resistor 48 are soldered to one side of the board 47.
It is a resistor formed in the form of a thin plate as a whole.

The resistor 46, 46 formed in this way is connected to the lead terminals 14a, 15a of the LED 14°15 located inside the switch, and the lead terminals 14a, 15, as shown in No. 6ti@.
It is interposed between pressure contact terminals 29a and 30a, which will be described later, which are connected to a.

By the way, the above-mentioned leaf spring 10 has two spring pieces 23 and 24 cut and raised on the leaf spring body 22 having a U-shaped cross section, and these spring pieces 23 and 24 are set at a predetermined position in order to obtain a sufficient switching stroke. After bending the length downward and drilling holes 25.25 at both ends in the longitudinal direction of the leaf spring body 22, and inserting the bottles on the lower surface of the leaf spring mounting legs 9, 9 into the holes 25.25. This bottle is attached to the lower surface of the push button 5 by heat caulking.

As shown in FIG.
It is always in contact with the center of the top surface.

The switch base unit 3 described above is composed of a switch base 20 made of synthetic resin and a switch mechanism 26.

This switch mechanism 26 includes fixed terminals 27 to 32, which will be described below, each inserted into the switch base 20.
and a conductive reversing spring 19 corresponding to a movable terminal disposed on the terminal 28.

The above-mentioned terminals 27 to 32 are as follows. That is, the output terminal 27 located at the lower center of the above-mentioned reversing spring 19, the input terminal 28, 28 always in contact with the lower circumferential surface of the reversing spring 19, the first external lead-out terminal 29 electrically connected to this terminal 28, and the above-mentioned a second external lead-out terminal 30 electrically connected to the output terminal 27; a third external lead-out terminal 31 provided at a position opposite to the above-mentioned first external lead-out terminal 29; A fourth external lead-out terminal 32 is formed by inserting into the switch base 20 described above.

A first external lead-out terminal 29 serves as a common terminal on the input side.
and the second external lead-out terminal 30 serving as a common terminal on the output side.

30a is the aforementioned resistor 46.46 printed resistor 48°48
are in constant pressure contact with each other.

In addition, each of the rising pressure contact terminals 31a and 32a of the third external lead-out terminal 31 and the fourth external lead-out terminal 32 is connected to each LE mentioned above.
Lead terminals 14b and 15b on the cathode side of D14.15
are in direct pressure contact with each other at all times.

In addition, the above-mentioned total of four external lead-out terminals 29.30°31.
32 is the opening 33 on the bottom surface of the switch housing 4 mentioned above.
The above-mentioned switch base 20 is fixed to the switch housing 4 by thermal caulking using the through holes 34 provided in the bottom surface thereof.

Further, spring pieces 35 are integrally formed at four lower outer corner portions of the switch housing 4, and these spring pieces 35 and the upper flange portion 36 are used to attach the housing 4 to an operation panel or the like. It is configured as follows.

The operation of the push button switch configured in this way will be explained.

Under normal conditions in which the push button 5 is not pressed down, the push button unit 1 is positioned in the illustrated state due to the spring force of the leaf spring 10.

Therefore, when the above-mentioned push button unit 1 is pressed down, the push button 5 is moved downward, and the plate is pressed down.

The leaf springs 10 attached to the spring attachment legs 9 are pressed down in conjunction with this.

The leaf spring body 22, which has a cross-sectional shape, absorbs this operating load, but when the operating load exceeds a predetermined value, the spring pieces 23 and 24 press the center of the reversing spring 19 at the bottom, and this reversing spring 19 is reversed. Then, the input terminal 2 is connected via the reversing spring 19.
8 and the output terminal 27, the switch mechanism 26 is turned on, and the LED 14 for operation display is made to emit light. In addition, the LED 5 for nighttime display always emits light.
To stop the light emission of l5, use another switch (
(not shown).

By the way, the lead terminal 14a of the above-mentioned LEDl4.15
, 15a and the pressure contact terminals 29a, 30a connected to the lead terminals 14a, 15a, a resistor 46° 46 for limiting the current to the LED 14.15 is interposed, so that
When a push button switch is arranged on an operation panel or the like, there is no need to separately connect a resistor to a board or the like outside the switch as in the conventional case, and wiring workability can be improved.

Moreover, since the resistor 46 described above is constructed by applying a printed resistor 48 to a thin plate-like substrate 47, the resistor 46 itself can be miniaturized and can be compactly incorporated inside the switch. .

FIG. 7 shows another embodiment in which a resistor 46.46 made of carbon-containing SIR rubber is disposed in the resistor holding portion 44.45, and the lead terminals 14a, 15a of the LED l4.
and the press-contact terminals 29a, 30a are formed so as to be connected via the resistor 46, 46 made of conductive rubber.

With this configuration, by adjusting the amount of carbon contained in the conductive rubber, the resistance value can be varied, for example, 1
It is possible to adjust the resistance between .Omega.

Since the embodiment shown in FIG. 7 has the same functions and effects as the previously described embodiment, the same parts in FIG. 7 as in FIG. omitted.

To summarize, inside the switch, between the lead terminals 14a, 15a and the pressure contact terminals 29a, 30a,
Since the resistor 46, 46 for current limiting is provided, there is no need to separately connect the resistor to the board, etc. outside the switch when installing the switch, which has the effect of improving wiring work efficiency. .

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is an exploded perspective view of an illuminated push button switch, and FIG.
FIG. 3 is a longitudinal cross-sectional view of the illuminated push button switch; FIG. 3 is a cross-sectional view of the illuminated push button switch in the width direction; FIG. FIG. 5 is an exploded perspective view showing a resistor interposed structure, FIG. 6 is a vertical sectional view of the main part of FIG. 5, and FIG. 7 is an exploded perspective view showing another embodiment of the resistor. 14.15...LED 14a, 14b, 15a, 15b/IJ-do terminal 29
a, 30a... Pressure contact terminal 46... Resistor

Claims (1)

[Claims] 1. An illuminated push button switch in which a lighting element having a pair of lead terminals is housed inside the switch, and a lead terminal of the lighting element located inside the switch and a connection to the lead terminal. An illuminated push button switch with a current limiting resistor interposed between the pressure contact terminal inside the switch.