JP2590303Y2 - Sheet switch - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet-like switch, and more particularly to a sheet-like switch which can easily be restored to its original position and turned off even when a high load is removed.

[0002]

2. Description of the Related Art Conventional sheet switches are disclosed in
As shown in JP-A-150517, a conductive material is printed on a film of polyester or the like, and lead wires are drawn out. A pair of upper and lower electrodes is opposed to each other with a small interval and pressed from above and below to bend the film so that both electrodes are bent. Some touch switches are turned on. Further, there has been proposed a switch in which a spacer having a predetermined thickness is interposed between polyester films on which the conductive material is printed. Further, as disclosed in Japanese Patent Application Laid-Open No. 55-133709, there is a type in which two conductive plates are arranged with a pressure-sensitive conductive member interposed therebetween.

[0003]

However, when a conductive material is printed on a resin film, the switch is turned on and off by bending a film of polyester or the like. And there is a problem that it is damaged by overload. In addition, this switch has a problem that, when a heavy load far exceeding the operating load is applied, the polyester film is plastically deformed and the electrodes are brought into close contact with each other, and the restoring property is lost, and the conductive paint is damaged by a compressive force. Was. The present invention solves such a problem, and provides a sheet-like switch that can instantaneously restore the deformation of the electrode plate and switch off even when a heavy load is removed.

[0004]

In the sheet switch according to the present invention, two electrode plates are superposed and interposed between a pair of resin films each having a circuit formed by a conductive member, and the conductive member is connected to each electrode plate. In a sheet-like switch in which a spacer is provided between the electrode plates and a space is provided between the electrode plates, the lengths of the two electrode plates are different, and both ends of one electrode plate are connected to the other. , And the projection is fixed on a resin film provided with the other electrode plate, and one electrode plate is curved so as to be elastically deformed . Further, the present invention includes the sheet-like switch according to claim 1, wherein a reinforcing plate is fixed to the resin film near the electrode plate.

[0005]

In the above-mentioned sheet-like switch, a spacer is sandwiched between electrode plates of different lengths arranged between resin films,
By making both ends of the long electrode plate protrude from the short electrode plate and fixing this protruding portion on the resin film on which the short electrode plate is installed, the long electrode plate is curved and becomes short. It is separated from the electrode plate. Therefore, even if a load is applied to the switch and removed, the long electrode plate is instantaneously separated from the short electrode plate and restored to the original position. Also,
If a reinforcing plate is provided near the electrode plate, a greater load can be applied by dispersing the force applied to the electrode plate.

[0006]

1 is a plan view of a sheet-like switch according to the present invention, and FIG. 2 is a sectional view taken along the line AA of FIG. 1. In the sheet-like switch 1, an elastic and conductive phosphor bronze or the like is used. The electrode plate 2 and the lower electrode plate 3 are arranged in a state of being overlapped between a pair of resin films 4 made of a synthetic resin such as polyester or polyimide. The spacer 5 and the adhesive tape 6 are arranged to form a space 7 in the upper and lower electrode plates 2 and 3. A conductive member 8 such as a conductive paint or a conductive film is attached to the resin film 4 as a circuit, and is in contact with the upper electrode plate 2 and the lower electrode plate 3.

The spacer 5 is made of an insulating resin film such as polyester or polyimide. The thickness of the spacer 5 is a distance between the upper electrode plate 2 and the lower electrode plate 3. A range of 0.5 mm is preferred. 0.
If it is less than 025 mm, the distance between the upper electrode 2 and the lower electrode plate 3 becomes too small, which may lead to a malfunction of the switch. On the other hand, if it exceeds 0.5 mm, the amount of deflection of the upper electrode plate 2 increases, and the operating load of the switch increases.

In the present invention, however, the upper electrode plate 2 is longer than the lower electrode plate 3, and both ends of the upper electrode plate 2 project from the ends of the lower electrode plate 3, and the projections 9, 9 are formed by the lower electrode plate 9. The plate 3 is fixed to the surface of the resin film 4 on which the plate 3 is installed with an adhesive tape 6 or the like. For this reason, the upper electrode plate 2 has a curved shape based on the protrusion 9, and the upper electrode plate 2 located between the spacers 5, 5 is always separated from the lower electrode plate 3. When the upper electrode plate 2 receives a load, it comes into contact with the lower electrode plate 3 to be turned on, and when the load is removed, the upper electrode plate 2 becomes the lower electrode plate 3.
Is instantaneously separated and restored, and the switch is turned off.

FIG. 3 shows another embodiment of the present invention. The basic operation and effect of the switch 1 is the same as that of the switch shown in FIG. 1, but is different from the switch shown in FIG. 1 in that a reinforcing plate 11 is provided near the upper and lower electrode plates 2 and 3.
That is, the reinforcing plate 11 is disposed before and after the upper and lower electrode plates 2 and 3, and is fixed to the resin film 4, and an insulating tape 12 is laminated on the reinforcing plate 11 to insulate it from the conductive member 8. Therefore, when a load is applied to the switch 1, the reinforcing plate 1
1 also carries a load, and the forces applied to the upper and lower electrode plates 2 and 3 are dispersed, so that a larger load can be applied to the switch 1. A plurality of the switches 1 are arranged at regular intervals on the substrate 13 as shown in FIG. 4, for example, and can be used as a sensor capable of detecting a water level, for example.

The effect of the switch of the present invention on the resilience will be described below. This switch is basically the same as the structure shown in FIG. Thickness 175 with conductive paint applied as circuit
Two resin films made of μm polyester are prepared, a lower electrode plate made of a phosphor bronze plate of 8 × 60 × 0.1 mm is fixed to one of the resin films with an adhesive tape, and a conductive paint is brought into contact therewith. Then, 8x75x0.
100 μm thick upper electrode plate made of 1 mm phosphor bronze plate
Spacers made of polyester resin are arranged and fixed at intervals of 40 mm, and are stacked on the lower electrode plate. The portion protruding from the lower electrode plate is fixed on the resin film with an adhesive tape, and the other resin film is fixed on the upper electrode plate. To obtain a switch. The operating load of this switch is 4 g.

On the other hand, in the switch of the comparative example, the lower electrode plate and the upper electrode plate have the same dimensions, and a spacer made of a polyester resin having a single-sided adhesive layer having a thickness of 100 μm is used.
It was arranged and fixed between the upper and lower electrode plates at an interval of 0 mm. The operating load of this switch is 3 g.

These switches have a capacity of 30 kg / 10 cm ×
After applying a load of 10 cm at 60 ° C. all day, the electric resistance value when the load was removed was measured. As a result, the switch of the present example instantaneously had an electric resistance value of 10 MΩ or more, whereas the switch of the comparative example required 5 minutes to reach 10 MΩ.

[0013]

As described above, in the sheet switch of the present invention, a spacer is sandwiched between electrode plates of different lengths arranged between resin films, and both ends of the long electrode plate are connected to the short electrode plate. By fixing this protruding part to the resin film on which the short electrode plate is installed, the long electrode plate is fixed in a curved and elastically deformed state, so that the electrode plates are separated from each other. ing. Therefore, even if a load is applied to the switch and removed, the electrode plate is instantaneously separated and restored to the original position. If a reinforcing plate is provided near the electrode plate, a greater load can be applied by dispersing the force applied to the electrode plate.

[Brief description of the drawings]

FIG. 1 is a plan view of a sheet-like switch according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a plan view of another sheet-like switch according to the present invention.

FIG. 4 is a view showing a state in which a plurality of sheet-like switches according to the present invention are arranged on a substrate at regular intervals.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sheet-shaped switch 2 Upper electrode plate 3 Lower electrode plate 4 Resin film 5 Spacer 7 Space 8 Conductive member 9 Projection 11 Reinforcement plate

Continuing on the front page (72) Inventor Kozo Yokoyama 4-1-1-21 Hamazoedori, Nagata-ku, Kobe Examiner at Mitsuboshi Belting Co., Ltd. Shinichi Nakagawa (56) References JP-A-60-115115 (JP, A) 60-150517 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01H 13/52

Claims (2)

(57) [Scope of request for utility model registration] 1. A method according to claim 1, wherein two electrode plates are overlapped and interposed between a pair of resin films each having a circuit formed of a conductive member, the conductive members are brought into contact with the respective electrode plates, and a spacer is arranged between the electrode plates. In the sheet-like switch in which a space is provided between the electrode plates, the lengths of the two electrode plates are made different, and both ends of one electrode plate are made to protrude from the other electrode plate. The electrode plate is fixed on the resin film on which it is installed , and one electrode plate is curved so as to elastically deform.
A sheet-like switch, characterized in that: 2. The sheet-like switch according to claim 1, wherein a reinforcing plate is fixed to the resin film near the electrode plate.