JPH0327310Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to an illuminated switch that utilizes the phenomenon that oscillation stops when a finger, rubber, etc. touches the surface electrode of an oscillating crystal resonator.

[Prior art] It is relatively easy to make an illuminated push switch due to its horizontal structure, but noise, sparks, and chatter are generated because mechanical contacts are turned on and off by pressing and releasing the push button. Or, contact wear and deterioration are relatively significant. Further, there are problems in that the pressure required for operation is large and the stroke is also long.

[Purpose of the invention] The purpose of the invention is to provide an illuminated switch that operates lightly and accurately with a short stroke and has a long life.

[Summary of the invention] This invention focuses on the fact that the crystal resonator is transparent and that the oscillation stops when the surface electrode is touched during oscillation, and uses transparent electrodes on both sides to maintain transparency. A light emitting diode is mounted on the printed wiring board as an illumination light source and is supported through a support pin that partially serves as a lead and a crystal holder, and has transparent electrodes on both upper and lower surfaces, and the transparent electrode on the upper surface is one. A message film is placed between the crystal oscillators that wrap around the bottom surface at one corner, while a touch sheet made of translucent rubber or the like is placed close to the front side of the crystal oscillator, and the oscillation is generated by pressing the touch sheet. The stop is used as a detection signal for switch operation, and this detection signal is used to turn on or off a switching element such as a transistor.

[Example] Figures 1 to 3 show an example of the present invention, in which 1 is a touch sheet made of transparent rubber or the like;
Reference numeral 2 designates an upper lid formed of a transparent material so as to have an opening 2A on the front surface, and crystal holding pins 2B are provided downwardly in the four corners of the upper lid. The touch sheet 1 is attached to the upper lid 2. 3 is a crystal resonator, and transparent electrodes 3a and 3b are provided on both sides of the crystal resonator. In that case, the transparent electrode 3a on the front (upper surface in the figure)
wraps around the rear surface (bottom surface in the figure) at one corner. Reference numeral 4 designates crystal support pins, and two of the four also serve as leads for the crystal resonator 3, one of which connects to the extension of the transparent electrode 3a that wraps around the rear surface, and the other to the rear transparent electrode 3b. The crystal resonator 3 is held between the upper lid 2 and the presser pin 2B so as not to affect vibration damping.

Reference numeral 5 designates a crystal holder, into which the support pins 4 are embedded, and which are held down by springs 6.

7 is a transparent or translucent spacer, and 8 is a message film in which the use of the switch is written, such as "POWER", which is placed on the spacer 7 and removably sandwiched between the crystal holder 5 and the crystal holder 5. Reference numeral 9 denotes a case body, which includes a receiving portion for the crystal holder 5, a receiving portion for the spacer 7, and a printed wiring board 1.
0 and the upper lid 2, each of which has a crystal holder 5, a spacer 7, and a printed wiring board 1.
0. It is integrated by receiving the upper cover 2.

The printed wiring board 10 is mounted with a light emitting diode 11 as an illumination light source, an oscillation circuit component 12, a circuit component 13 for detecting the presence or absence of oscillation, and is connected to the support pin 4 which also serves as a lead. A lead wire 14 is drawn out through the lid 15. The circuit constituted by this printed circuit board 10 and the mounted components is as shown in FIG.
In the figure, IC ₁ to IC ₄ are inverters, R ₁ to _{R 4} are resistors,
C ₁ to _{C 3} are capacitors; the inverter IC ₁ , resistors R ₁ and R ₂ , capacitors C ₁ and C ₂ , and crystal oscillator 3 constitute an oscillation circuit, and the resistor R ₃ and capacitor C ₃ constitute a time constant circuit. (integrator circuit) is configured and connected between inverter IC ₃ and IC ₄ . This circuit and the inverter IC ₄ at the subsequent stage detect the presence or absence of oscillation as logic levels "0" and "1".

Although not shown, it has a switching element (such as a transistor) that is turned on and off in response to the detection signal.

With the above structure, the oscillation circuit is normally in an oscillating state, and the logic output is "0". Therefore, the switching element is in an off state, and the light emitting diode 11 is turned off.

Next, when the touch sheet 1 is pressed with a finger or the like, the sheet 1 is recessed and enters the opening 2A of the upper lid 2, and touches the front electrode 3a of the crystal resonator 3. This contact stops the oscillation and the output (logical output) of the inverter IC ₄ becomes "1", the switching element turns on, the light emitting diode 11 lights up, and a code indicating the switch use of the message film 8 is embossed on the sheet 1. . In this on state, if the detection signal (logical output) is input to the flip-flop and the output of the flip-flop is used as the driving signal for the switching element, the pressing of the touch sheet 1 is stopped, the oscillation circuit enters the oscillation state, and the output of the inverter IC ₄ is It is persisted even after becomes "0".

After this, when the touch sheet 1 is pressed again, the oscillation is stopped, and as the output of the inverter IC ₄ becomes "1", the output of the flip-flop is inverted and the switching element is turned off. At the same time, the light emitting diode 11 is turned off.

In the above embodiment, the message film 8 is used to display the switch usage.
As shown in the figure, at least one of the electrodes on both sides of the crystal resonator 3 (the front electrode is shown as 3a', the rear electrode is not shown) is made opaque, and display items (for switch use), such as You can also cut out “A”. In this case, the message film 8 becomes unnecessary. Further, in contrast to the above embodiment, the characters of display items become brighter.

[Effect] As described above, according to the present invention, the oscillation stops when the surface electrode of the oscillating crystal oscillator is touched, and the crystal oscillator is transparent. During operation, a touch sheet made of transparent rubber or the like placed close to the front surface is pressed so that it comes into contact with the electrodes of the vibrator, and the presence or absence of oscillation is determined by logical levels "0" and "1".
This turns on the switching element.
Lighting of light emitting diode as off and illumination light source,
Since it is controlled to turn off the light, it can be turned on and off without causing noise or chattering, and has a long life and high reliability. Furthermore, since it is sufficient to touch the rubber touch sheet to the electrodes of the crystal resonator, the pressure required for operation is small and the stroke is also very short. Furthermore, since the crystal resonator is transparent, it is easy to make it an illuminated type, and various messages can be accurately displayed by inserting a message film or forming electrodes on the crystal resonator.

[Brief explanation of the drawing]

Fig. 1 is a partially sectional side view showing an embodiment of the illuminated switch according to the present invention, Fig. 2 is an exploded perspective view of the same, and Fig. 3 is an oscillation circuit in the same embodiment, which detects the presence or absence of oscillation. A circuit, a connection diagram showing a configuration example of a light emitting diode lighting circuit, and FIG. 4 is a perspective view showing a main part of another embodiment of the present invention. 1...Touch sheet, 2...Top lid, 2A...Opening, 3...Crystal resonator, 4...Support pin, 5...
... Crystal holder, 6 ... Spring, 7 ... Spacer, 8 ... Message film, 9 ... Case body, 10 ... Printed wiring board, 11 ... Light emitting diode, IC ₁ to IC ₄ ... Inverter, R ₁ ~ _R4 ……
Resistance, C ₁ to C ₃ ... Capacitor, 3a, 3b...
Transparent electrode, 3a'...opaque electrode (front).

Claims (1)

[Claims for Utility Model Registration] (1) A switch that electrically detects the presence or absence of a switch operation and controls the on/off of a switching element such as a transistor based on this detection signal, which has transparent electrodes on both the upper and lower surfaces. The transparent electrode on the top surface has a crystal oscillator that wraps around to the bottom surface at one corner, a support pin whose part becomes a lead for the surface electrode of this crystal oscillator, and an opening on the front surface. A top cover that holds the crystal resonator between the presser pin on the inner surface and the support pin, a touch sheet made of transparent rubber or the like affixed to the front surface of the top cover, and a crystal presser that holds the support pin via a spring. , a case body integrated with the crystal holder and the top lid, a printed wiring board disposed within the case body, connected to the support pin that also serves as a lead, and from which lead wires are drawn out; With a light emitting diode as an illumination light source mounted on a wiring board, and constituent elements such as an oscillation circuit and an oscillation detection circuit mounted on the printed wiring board,
It constitutes a detection unit that detects the presence or absence of a switch operation, and normally an oscillation circuit including a crystal oscillator is kept in an oscillating state, and when the switch is operated, the touch sheet is pressed to contact the surface electrode of the crystal oscillator, and the accompanying oscillation occurs. While detecting the stop and using the presence or absence of a switch operation as a detection signal, the surface electrode of the crystal oscillator is a transparent electrode, and a message film is removably sandwiched between the light emitting diode and the crystal oscillator. An illuminated switch that displays a message by emitting light. (2) The illuminated switch according to claim 1, wherein the surface electrode of the crystal resonator is an opaque electrode, and a necessary message is hollowed out in the opaque electrode.