JPS5836444B2 - 2-wire non-contact micro switch - Google Patents

Description

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

Conventionally, to add an operation display function to a non-contact microswitch, a package type light emitting element has been used, which has the disadvantage of increasing the number of man-hours and, in particular, taking up space.

It is an object of the present invention to solve the above-mentioned problems and provide a two-wire non-contact microswitch that has various effects by employing a two-wire switching circuit.

One embodiment of this invention will be described below.

First, as shown in FIG. 1, a metal plate is punched out to form the terminal pieces 12 to 15, the locking pieces 16 and 17, and the frame 11.

Each of the terminal pieces 12 to 15 and the locking pieces 16 and 17 are connected to the frame 11 so that they are not punched out or separated.

Further, the locking piece 17 is provided with a hole 171, and the tag locking piece 16 is provided with a groove 161 (see FIG. 5B) and a cut arrow portion 162.

Next, as shown in FIG. 2, the IC pellet 2a is fixed to the locking piece 16, the light emitting diode pellets 2b and 2c are fixed to the terminal pieces 14 and 15, respectively, and the terminals of each pellet are fixed to the terminal pieces 12 to 15. Connect the wires (connect to the terminal piece 12 via the locking piece 16).

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

That is, as shown in FIG. 8, the circuit section 20 includes a photoelectric detection circuit 22, a constant voltage circuit 201 including a smoothing circuit, an SCR 202 shown as an example of a switching element, a constant voltage diode 203, a backflow prevention diode 204, and a display light emitting device. It consists of a diode 206 (consisting of a pellet 2c), current limiting resistors 207 and 208, and a rectifying bridge 209.

The photoelectric detection circuit 22 includes a light emitting diode 221 (pellet 2
2), an amplifier circuit 223, and a level detection circuit 224.

Next, as shown in FIG. 3, pellets 2a, 2b
> 2 c, respectively, so that the transparent resin member 30
a > 30b, 30c, and as shown in FIG. 4, the transparent resin members 30a, 30b, 3
The case 3 is resin-molded so as to include the terminal pieces 12 to 15 and the locking pieces 16 and 17.

After doing this, the frame 11 is cut to separate the case 3 from the frame 11 as shown in FIGS. 5A and 5B.

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

In addition, the transparent resin member 3 0 a t 3 0 b t
3 Q c is exposed on the surface of 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 7H, 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 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 cover 4 has 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 microswitch configured as described above 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 sufficiently bent.

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

At this time, the light beam projected from the light emitting diode 221 (see FIG. 9) passes through the transparent resin member 30b, is reflected on the inner wall surface of the cover 4, and is transmitted through the transparent resin member 30a to the light receiving element 222 (see FIG. 9). ), but the light shielding plate 5 is interposed in this optical path, and the light receiving element 2
22 does not receive light.

Therefore, in FIG. 8, the output of the photoelectric detection circuit 22 becomes rLJ (the circuit configuration is such as this), and S
CR202 is off.

As a result, the terminal strips 12 and 13 are turned off (strictly speaking, as will be described below, the current supplied to the photoelectric detection circuit 22 flows as a leakage current).

However, this is extremely small and can be considered off).

Then, the light emitting diode 206 goes out, and the transparent resin member 30C remains dark, indicating this off state.

On the circuit section 20 side, a voltage as shown in FIG. 10A is generated at point A.

This voltage is dropped by the resistor 207, and a voltage as shown in FIG. 10B is generated at point B.

Therefore, sufficient current for operation can be supplied to the photoelectric detection circuit 22.

In FIGS. 7A and 7B, as the push button 8 is retracted and the spring 6 is bent, the light shielding plate 5 receives clockwise torque and moves downward by a snap action.

Then, the light shielding plate 5 is no longer interposed in the optical path described above, and the light receiving element 222 starts receiving light.

Then, in FIG. 8, the output of the photoelectric detection circuit 22 becomes rHJ, and the SCR 202 is turned on.

As a result, the connection between the terminal pieces 12 and 13 is turned on, and power is supplied to the load L.

At the same time, a current is supplied to the light emitting diode 206 to turn it on, and as a result, the transparent resin member 30C becomes bright, indicating this on state.

On the other hand, on the circuit section 20 side, a voltage as shown in FIG. 11C is generated at point C.

This voltage is dropped by the forward voltage drop by the diode 204, and a voltage as shown in FIG. 11B is generated at point B.

Therefore, in this case as well, sufficient current is supplied to the photoelectric detection circuit 22 for operation.

Therefore, the photoelectric detection circuit 22 is connected to the SCR 202.
When the SCR 202 is turned on or off, it receives power and outputs a detection signal for driving the SCR 202.

In FIGS. 7A and 7H, when the push button 8 is released, the coil spring 6 returns to its undeformed state while pushing up the push button 8 with its own elastic force.

As a result, the light shielding plate 5 receives a counterclockwise torque and moves upward by a snap action 7, and is stopped by the stopper 34.

Then, the light shielding plate 5 will be interposed in the aforementioned optical path again, and the light receiving element 222 will stop receiving light.

Therefore, the terminal strips 12 and 13 are turned off, and the light-emitting diode 206 indicates that the terminal strips 12 and 13 are turned off.

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

Note that the present invention is not limited to the above-mentioned one embodiment.

For example, in the above embodiment, as shown in FIG. 8, a so-called voltage division type two-wire switching circuit is adopted as the circuit structure, but as shown in FIG.
A wire switching circuit may also be used.

That is, instead of the constant voltage diode 203 in FIG. 8, the SCR 210, the constant voltage diode 211, and the resistor 2 are used.
12.

In this case as well, the SCR2
02 can be turned on and off to control the power supply to the load L.

Then, this on/off state can be displayed by the light emitting diode 206.

On the circuit section 20a side, when the SCR 202 is off, the 13th
Voltages as shown in the figure are generated at points A and B, and current is supplied to the photoelectric detection circuit 22.

On the other hand, when the SCR 202 is on, voltages as shown in FIG. 14 are generated at points B and C.

From the time when the anode potential of SCR210 becomes zero, S
This is because the gate current does not flow and the SCR 210 is not triggered until the CR 210 is turned off and the anode potential exceeds the Zener potential ■Z of the voltage regulator diode 211.

Therefore, even in this case, sufficient current can be supplied to the photoelectric detection circuit 22.

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 a slow action, unlike a snap action switch, it is impossible to detect whether the switch is on or off by the feel of the switch when pressed, so there is a strong demand for adding an operation display function, and the effects of the present invention are significant.

As described above with respect to one embodiment, according to the present invention, a non-contact microswitch equipped with an operation display section has conventionally been difficult to provide an indicator window in the case or connect a discrete light emitting diode. Although it was necessary and could not be miniaturized, by incorporating a structure in which semiconductor pellets for dynamic Y and display were also embedded in the case, it was possible to make holes in the display window and connect the die/i-de. This eliminates the need for assembly, reduces assembly man-hours, and allows for a smaller size.

In addition, since the IC pellet employs eight 2-wire switching circuits, the number of external terminal pieces can be reduced, making it possible to create a J-shape, and H'. Wiring work for external loads and power sources is also easy.

Furthermore, since there are two external terminal pieces and two external wires, even if a cable breakage occurs, it is easy to confirm the location of the cable, which improves reliability.

[Brief explanation of the drawing]

1 to 6 are diagrams showing each process of one embodiment of the present invention, and FIGS. 7A and B show a non-contact microswitch according to one embodiment, and FIG. 7A shows a part of the switch. 7B is a partially cutaway side view, FIG. 8 is a block diagram showing the circuit configuration, FIG. 9 is a block diagram showing the photoelectric detection circuit 22 of FIG. 8, Figures 10 and 11 are 8
FIG. 12 is a block diagram showing a modified example, and FIGS. 13 and 14 are waveform diagrams showing waveforms at each point in FIG. 12. 11... Frame, 12-15... Terminal piece, 16, 17... Locking piece, 2 a t 2
d...IC pellet, 2b, 2c...
・Light-emitting diode pellet, 20, 20a...
・Circuit part, 3... Case, 30a, 30b
t 3 0 c...Transparent resin member, 31,3
2...Claw part, 33...Convex part, 34...
...Stopper, 4...Cover 5...
... Light shielding plate, 5a... Movable piece, 6...
Coil spring, 8...Push button.

Claims (1)

[Claims] 1. Includes two plate-shaped terminal pieces arranged on the same plane to connect a power source and a load in series, and a switching element connected to the two terminal pieces to switch between these terminal pieces. and a light receiver connected to the two terminal pieces in parallel with the switching element and outputting a detection signal for receiving power and driving the switching element when the switching element is turned on or off. and a main semiconductor pellet including a circuit section for detecting a received light level, and a main semiconductor pellet that is connected to the two terminal pieces in parallel with the switching element and receives power when the switching element is turned on or off. A light emitting semiconductor pellet constituting an operating light emitting section, an operation display semiconductor pellet constituting an operation display section that performs display operation in response to the current flowing through the switching element, and each of the semiconductor pellets. A transparent or anti-transparent resin member to be molded, a resin member including each of the terminal pieces and each of the resin members and including the main semiconductor pellet, and a resin member including the light projecting semiconductor pellet are exposed on the inner surface side. a case molded with an opaque resin such that a resin member containing a semiconductor pellet for operation display is exposed on the outside; a cover fitted to the case; and a cover provided on the cover and provided with the light emitting a reflective surface that reflects light from the main semiconductor pellet and makes it incident on the main semiconductor pellet; a push button that is attached to the case; and a push button that is attached to the case and covered by the cover; A non-contact switch comprising: a movable member that passes or blocks the reflected light and generates a switching output from the circuit section by moving based on the above.