JPS62287529A - Photoelectric type key 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 3. Detailed Description of the Invention [Technical Field to Which the Invention Pertains] The present invention relates to a photoelectric pushbutton switch used in an electronic control circuit of a vending machine or the like.

[Prior art and its problems]

As a pushbutton switch for vending machines and the like, the one shown in Figure 5 is conventionally known. In FIG. 5, a push button 2 is provided in the opening of the case 1 by fitting into the opening, and a return spring is provided between the push button 2 and the partition wall 1a provided in the middle of the case 1 on the inner end surface of the case 1. 3 is placed. Also, in the back of case L, each terminal 4 is inserted through case 1.
, 5 and 6 are arranged side by side, one ends of both terminals 4 and 6 are fixed contacts 4a and 6a, respectively, a leaf spring 7 is attached to one end of the terminal 5, and a switching movable contact 7a is fixed to the tip thereof, It is designed to switch between both fixed contacts 4a and 6H. A partition wall 1 is provided between the push button 2 and the tip of the leaf spring 7.
A movable intermediate member 8 is provided through the protrusion 2a of the push button 2, and the intermediate member 81! The movable contact 7a is moved by pressing the tip of the leaf spring 7 via the contact point 7a.

When the push button 2 is pressed against the return spring 3, the leaf spring 7 curves and the movable contact 7a changes from the fixed contact 6a to the fixed contact 4a.
Switch to . When the push button 2 is released, it returns to its original position under the force of the return spring 3, so that the movable contact 7a switches from the fixed contact 4a to the fixed contact 6a.

The intermediate member 8 returns to the position shown in the figure under the bias of the leaf spring 7.

When this pushbutton switch is installed in a vending machine, depending on how the pushbutton is pressed, the leaf spring vibrates and the movable contact chattering, causing the movable contact to repeatedly contact the fixed contact two or more times. When controlling high-speed operating electronic circuits with such contacts.

The disadvantage is that the number of times the contacts connect and disconnect is reflected in the operation of the electronic circuit, which is inconvenient.

[Purpose of the invention]

The present invention does not cause contact chattering.

The object of the present invention is to provide a pushbutton switch that can be used in circuits that operate at high speed.

[Summary of the Invention] The main points of the present invention are a light-emitting element, a light-receiving element that receives light emitted from the light-emitting element and conducts electricity, and a light-receiving element that is moved by a push button to block light between the light-emitting element and the light-receiving element. Although it is a push-button switch, the contact part is electronically opened and closed to eliminate contact chatter and enable stable switch operation. Note that the same effect can be obtained even if the light shielding plate is a reflecting plate that reflects the light from the light emitting element and causes it to enter the light receiving element, and this reflecting plate allows the light from the light emitting element to enter or deflects the light from the light receiving element.

[Embodiments of the invention]

Embodiments of the present invention will be described below based on the embodiments shown in FIGS. 1 to 4. In FIG. 1, the pushbutton switch is fitted into an opening of a case 1 and has a pushbutton 2, similar to the conventional pushbutton switch.

A return spring 3 is provided between the inner end surface of the case 1 of the push button 2 and the partition wall 1a. However, this pushbutton switch differs greatly from conventional pushbutton switches in that it has no mechanical contacts and is instead a photoelectric switch.

In other words, the case l is separated from the push button 2 side by the partition wall 1a.
A light emitting diode 9 and a phototransistor 10 are lined up at the back, and arranged so that the light emitted by the light emitting diode 9 is incident on the phototransistor 10. When the push button 2 is pressed, a light shielding plate 1 provided on the inner end surface of the case of the push button 2 blocks the light emitting diode 9 and the phototransistor 10 through the slit lb of the partition wall la.

When the phototransistor 10, which is always in the on state by receiving the light from the light emitting diode 9, presses the push button 2, the light shielding plate 11 blocks the light entering the phototransistor 10 from the light emitting diode 9, so the phototransistor 10 is switched to the off state. Wow. In other words, a photoelectric on/off circuit can be configured, and with this configuration, even if the push button vibrates to some extent, the phototransistor will not turn on or off unless the push button is firmly pressed.

Figure 2 shows a light shield with a reflector instead of a light shield.

The light emitting surface of the light emitting diode 9 and the light receiving surface of the phototransistor 10 are arranged at an angle of about 150 degrees. Case 1,
Push button 2) The return spring 3 is the same as that shown in FIG. is provided.

In the flexible state, the light from the light emitting diode is reflected by the reflection plate 13 and enters the phototransistor 10, and the phototransistor 10 is turned on, but when the push button 2 is pressed, the reflection plate 13 approaches the light emitting diode 9 and the phototransistor 10. Since the light is too strong, the focus becomes blurred and the amount of light incident on the phototransistor 10 decreases, so the phototransistor 10 is turned off. It is also possible to have a configuration in which a small amount of light enters the phototransistor at all times, and when a push button is pressed, a large amount of light from the light emitting diode 9 is reflected by the reflector plate 13 and enters the phototransistor 10. In this case, the suppression of pushbutton 2 and the phototransistor 1
The relationship between on and off of 0 is opposite to that in FIG.

Figures 3 and 4 are examples of photoelectric applications of small pushbutton switches called microswitches.

In FIG. 3, one end of a leaf spring 14 is fixed to the case 1, and a push button 2 fixed to the other end protrudes outside the case 1.

Since the light emitting diode 9 and the photodiode are arranged side by side in a direction perpendicular to the plane of the paper, the photodiode is not shown in FIG. The light shielding plate 11 is provided at the center in the length direction of the leaf spring 14, and is configured such that when the push button 2 is pressed, the light shielding plate 11 is inserted between the light emitting diode 9 and the photodiode (the light shielding plate 1). The transistor is always in the on state because it receives light, and when the push button 2 is pressed, it changes to the off state.

Fig. 4 shows a case in which a reflector is provided in place of the light shielding plate in Fig. 3, and the case 1% push button 2) leaf spring] 4 is arranged exactly the same as in Fig. 3, but the light emitted from the light emitting diode 9. The surface and the light receiving surface of the phototransistor 10 are arranged at an angle of approximately 120 degrees from each other, and the constant reflection plate 13 reflects the light from the light emitting diode 9 and makes it incident on the phototransistor 10, turning the phototransistor 10 on. However, when the push button 2 is pressed, the angle of the reflection plate 13 changes and the light from the light emitting diode 9 no longer enters the phototransistor 10, so the phototransistor 10 is turned off. Of course, it is also possible to reverse the relationship between pressing the push button 2 and turning on/off the phototransistor 10.

〔Effect of the invention〕

As described above, according to the present invention, the mechanical contacts at the on/off portion of the switch are replaced with electronic switching elements, so the photoelectric pushbutton switches are free from chattering and can be made compact.

It is suitable as a pushbutton switch for operating a single circuit that operates at high speed, such as a switch in a vending machine.

[Brief explanation of drawings]

1 to 4 each show an embodiment of a photoelectric pushbutton switch according to the present invention, and FIG. 1 is a side view showing an embodiment of a switch using a light shielding plate. Fig. 2 is a side cross-sectional view showing one embodiment of a switch using a reflector, Figs. The figures are cross-sectional views showing examples using reflectors, and Figure 5 shows an example of a conventional pushbutton switch. 11 is a cross-sectional view of FIG. 2°°° push button, 9°°° light emitting diode, 10...
・Phototransistor, 1]...Light shielding plate%13...Reflecting plate. Ka-Shichizo Figure 1 Figure 2 Figure 5

Claims (1)

[Scope of Claims] 1) A light-emitting element, a light-receiving element that receives light emitted from the light-emitting element and conducts the light, and is moved by a push button to block or pass light between the light-emitting element and the light-receiving element. A photoelectric pushbutton switch, characterized in that it is equipped with a light shielding plate. 2) In the photoelectric pushbutton switch according to claim 1, the light shielding plate is a reflecting plate that reflects the light from the light emitting element and makes it enter the light receiving element, and this reflecting plate reflects the light from the light emitting element to the light receiving element. A photoelectric pushbutton switch characterized by allowing or deflecting light into an element.