JPS5816570B2 - non-contact switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a non-contact switch that can display an operation using a light emitting element.

A non-contact switch uses a switching circuit instead of a mechanical contact, and conventionally, this switching circuit has been constructed by mounting individual components on a printed circuit board.

Therefore, a non-contact switch is constructed by housing this printed circuit board in a case and electrically connecting it to a terminal piece protruding from the case through a lead wire or the like.

However, such a configuration requires an extremely large number of assembly steps, and there are limits to miniaturization.

In recent years, with the development of integrated circuit technology, it has been considered to form switching circuits on integrated circuits instead of using printed circuit boards to reduce assembly man-hours and downsize.

Furthermore, since the switching operation of a non-contact switch is performed within an electronic circuit, the operating state cannot normally be perceived, and therefore is displayed using a light emitting element.

However, conventionally, it is common to use a light emitting diode housed in a single package, so even if the circuit is integrated as described above, this light emitting diode must be attached externally, and the connection work is required. was complicated.

Moreover, if the light emitting diode was provided separately from the integrated circuit, it would be necessary to provide a display window and mounting holes in the case, which would be an obstacle to miniaturization. .

This invention goes one step further in the direction of simplifying and miniaturizing the manufacturing process through integrated circuits, and minimizes the size of a type of non-contact switch that uses light emitting elements to indicate operation, while also minimizing the number of assembly steps. The aim is to reduce the amount of data to a minimum, and provides a concrete structure for this purpose.

A non-contact switch according to the present invention includes at least three plate-shaped terminal pieces arranged on the same plane, a main semiconductor pellet connected to the terminal pieces and forming a light receiving part and a main circuit part, and a main semiconductor pellet connected to the terminal pieces. A light projecting semiconductor pellet constituting a light projecting section, an operation display semiconductor pellet 1 connected to the terminal piece and constituting an operation display section, and a transparent or translucent resin molded containing each of the semiconductor pellets. parts and
A resin member that includes each of the terminal pieces and each of the resin members, a resin member that includes the main semiconductor pellet, and a resin member that includes the semiconductor pellet for light projection is exposed on the inner surface side, and a resin member that includes a semiconductor pellet for operation display. a case molded with an opaque resin so that it is exposed on the outside; a cover fitted to the case; and a cover provided on the cover to reflect light from the light emitting semiconductor pellet to a reflective surface that is incident on the semiconductor pellet; and a reflective surface that is attached to the case and covered by the cover, and that moves based on external operation to pass or block the reflected light and generate a switching output from the circuit section. A movable member.

Therefore, miniaturization and reduction of assembly man-hours can be promoted to the utmost, and since the operation display semiconductor pellet constituting the operation display section is provided, the operation of the switch can be easily checked when the switch is used.

An embodiment of the present invention will be explained below.

First, as shown in FIG. 1, terminal pieces 11 to 15, locking pieces 16 and 17, and frame 10 are formed by punching out one metal plate.

Each of the terminal pieces 11 to 15 and the locking pieces 16 and 17 are punched out so as to be connected to the frame 10 so that they cannot be separated.

Further, the locking piece 17 is provided with a hole 171, and the locking piece 16 is provided with a hole 171.
A groove 161 (see FIG. 5B) and a notch 162 are provided in the groove 161 (see FIG. 5B).

Next, as shown in FIG.
, 2c are fixed to each other, and the terminals of each pellet are connected to the terminal pieces 11 to 15.

In this way, a circuit section 20 as shown in FIG. 8, for example, is constructed.

That is, as shown in FIG. 8, the circuit section 20 includes a light emitting diode 21 (corresponding to the pellet 2b) and a phototransistor 22 that transmit and receive light, a transistor 23 connected to the phototransistor 22 in Darlington,
Transistors 24 and 25 forming a Schmitt circuit that shape the received light output generated from the emitter of the transistor 23, a transistor 28 that generates a switching output according to the output generated at the collector of the transistor 25, and a transistor 28 that generates a switching output according to the output generated at the collector of the transistor 25. A transistor 26 causes a display light emitting diode 27 (corresponding to the pellet 2c) to blink.

Note that the terminals 01 to 03 are connected to terminal pieces 11 to 13, respectively.

Next, as shown in FIG. 3, pellets 2a.

Transparent resin member 30 including 2b and 2c, respectively.
a t 30 b t 3 Q c is molded, and as shown in FIG. 4, this transparent resin member 30a.

30b, 30C1 terminal pieces 11-15 and locking piece 16.
The case 3 is molded with an opaque resin so as to include the case 17.

After doing this, the frame 10 is cut and the case 3 is separated from the frame 10 as shown in FIGS. 5A and 5B.

Then, as shown in FIG. 6, the locking pieces 16 and 17 are bent.

Note that the transparent resin member 30a. 3Qb and 30C are exposed on the surface of the case 3.

Next, a light shielding plate 5 and a coil spring 6 are attached to this case 3.

That is, as shown in FIGS. 7A and 7B, while locking the spring hook 61 of the coil spring 6 in the hole 51 of the light shielding plate 5,
The other spring hook 62 is locked into the hole 171 (see FIG. 6) of the entire locking piece 17.

Then, one end of the light shielding plate 5 is engaged with the groove 161 of the locking piece 16.

At this time, the light shielding plate 5 receives a counterclockwise torque from the coil spring 6 and is stopped by a stopper 34 provided on the convex portion 33 of the case 3.

After the light shielding plate 5 and the coil spring 6 are attached to the case 3 in this way, the cover 4 with the push button 8 attached to the hole 42 is placed over the case 3.

This bar 4 is provided with claws 31 and 3 provided on the side of the case 3.
2 (see FIG. 5B) to prevent it from coming off.

Next, the operation of the non-contact switch configured in this way will be explained.

In FIGS. 7A and 7H, when the push button 8 is pressed, the push button 8 is retracted and the coil spring 6 is deflected.

In addition, since the locking piece 16 is provided with a notch 162,
The spring 6 can be bent in ten trays.

Initially, when the deflection is small, the light shielding plate 5 receives a counterclockwise torque and is stopped by the stopper 34.

At this time, the light i projected from the light emitting diode 21 (see FIG. 8) passes through the transparent resin member 30b, is reflected on the inner wall surface of the cover 4, passes through the transparent resin member 30a, and passes through the phototransistor 22 ( However, since the light shielding plate 5 is interposed in this optical path, the phototransistor 22 does not receive the light.

Therefore, in FIG.
is off, transistor 2'3 is off, so that transistor 24 is off, transistor 25 is on, and transistors 26, 28 are both off.

Therefore, between the terminals 01.02, that is, the terminal piece 11.1
2 is off, and the light emitting diode 27 indicates this by turning off.

That is, in FIG. 7B, the transparent resin member 30c is dark.

゛In Figures A and B of Fig. T, as the push button 8 is retracted and the spring 6 is bent, the five-ringed light-shielding plate receives clockwise torque and moves downward with a snap action.

Then, the light shielding plate 5 is no longer interposed in the optical path, and the phototransistor 22 starts receiving light.

'Then, in FIG. 8, the phototransistor 22 is on and the transistor 23 is also on, and as a result, the transistor 24 is on and the transistor 25 is off.

Both transistors 26 and 28 are then turned on.

Therefore, between the terminals o1 and o2, that is, the terminal pieces 11,
12 is turned on, and the light emitting diode 21 lights up to indicate this.

That is, in FIG. 7B, the transparent resin member 30c becomes brighter.

, 5, ``In Figures 7A and 7H, when the pressure on the push button 8 is released, the coil spring 6 returns to its undeflected cramming state while pushing up the push button 8 with its own elastic force. .

As a result, the light shielding plate 5 receives the torque in the counter-rotating direction and moves to the actual force by a snap action, and is stopped by the stopper 34.

Then, this light shielding plate 5 will be interposed in the aforementioned optical path again, and the phototransistor 22 will stop receiving light.

However, between the terminals 01 and 02, that is, the terminal piece 11°1
2 is turned off, and the light emitting diode 27 displays this as off.

That is, the transparent resin member 30c becomes dark.

In addition to the above embodiments, the following configurations are possible.

For example, instead of the circuit section 20 shown in FIG. 8, a circuit section 20a shown in FIG. 9 may be used.

This circuit section 2Qa has a light emitting diode 21 connected in parallel to a pair of light receiving circuits (corresponding to the IC pellet 2a) consisting of a phototransistor 22, transistors 23 to 25°28, etc. Since the structure of the series (series) and the front is the same as that shown in FIG. 8, corresponding numbers are assigned to corresponding parts and description thereof will be omitted.

Further, in the above embodiment, the movable part is driven by snap action, but it may be driven by slow action.

In the case of slow action, unlike in the case of snap action, it is not possible to detect whether the switch is on or off based on the feeling of compression, so there is a strong demand for adding an action display function.
The effects of the present invention are remarkable, and as described in the embodiments, according to the present invention, a non-contact switch equipped with an operation display section has conventionally provided a display window in the case or a discrete light emitting diode. By creating a structure in which the semiconductor pellet for operation display is also embedded in the case, there is no need to drill holes in the display window or connect light emitting diodes, reducing assembly man-hours. It is possible to downsize while reducing the amount of electricity.

−

[Brief explanation of the drawing]

1 to 6 are diagrams showing each process of an embodiment of the present invention, and FIGS. 7A and 7B show a non-contact switch according to an embodiment. Figure 7B is a partially cutaway plan view, Figure 8 is a partially cutaway side view, and Figure 8 is the circuit section 2.
FIG. 9 is a circuit diagram showing a modified example. "10...Frame, 11 to 15...
Terminal piece, 14a, '15a... Electrode, 16, 1
7... Locking piece, 2a... IC let, 2b, 2c... Light emitting diode pellet, 3
...Case, 30a, 30b. 30c...Transparent resin member, 31, 32...
...Claw sound -33... Convex portion, 34... Stopper, 4... Cover, 5... Light shielding plate, 5a... Movable piece, 6... Coil spring, 8... Push button.

Claims (1)

[Claims] 1. At least three plate-shaped terminal pieces arranged on the same plane, a main semiconductor pellet connected to the terminal pieces to constitute a light receiving section and a main circuit section, and a main semiconductor pellet connected to the terminal pieces to constitute a light projecting section. A semiconductor pellet for light projection, a semiconductor pellet for operation display connected to the terminal piece and forming an operation display section, a transparent or translucent resin member molded including each of the semiconductor pellets, each of the terminal pieces and A resin member including each of the resin members and the main semiconductor pellet and a resin member including the light projecting semiconductor pellet are exposed to the inner surface, and a resin member including the operation display semiconductor pellet is exposed to the outer surface. a case molded with an opaque resin in such a manner, a cover fitted to the case, and a cover provided on the cover to reflect light from the light projecting semiconductor pellet and make it incident on the main semiconductor pellet. a reflective surface, and a movable member that is attached to the case and covered by the cover and that moves based on an external operation to pass or block the reflected light and generate a switching output from the circuit section. A non-contact switch characterized by having: