JPH0568034U - Sheet switch - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a sheet-like switch in which the electrode plate is instantly restored to the original position and the switch is turned off even when a high load is removed. [Structure] Two electrode plates 2 and 3 are superposed and interposed between a pair of resin films 4 and 4 in which a circuit is formed by a conductive member 8, and the conductive member 8 is brought into contact with each electrode plate 2 and 3. The sheet-like switch 1 has a spacer 5 arranged between the electrode plates 2 and 3 and a space 7 provided between the electrode plates. Here, the two electrode plates 2 and 3 have different lengths, and both ends of the long electrode plate 2 project from the short electrode plate 3, and the projecting portions 9 install the short electrode plate 3. It is fixed on the resin film 4 thus prepared.

Description

[Detailed description of the device]

[0001]

[Industrial application]

 The present invention relates to a sheet-like switch, and more particularly to a sheet-like switch which can be easily restored to its original position and turned off even if a high load is removed.

[0002]

[Prior Art]

 A conventional sheet-like switch is, as shown in Japanese Patent Laid-Open No. 60-150517, printed with a conductive material on a film of polyester or the like, and lead wires are drawn out. There is one in which the film is bent by pressing to bring both electrodes into contact with each other to turn on the switch. Also, a switch has been proposed in which a spacer having a predetermined thickness is interposed between polyester films printed with the conductive material. Further, as disclosed in JP-A-55-133709, there is one in which two conductive plates are arranged with a pressure-sensitive conductive member interposed therebetween.

[0003]

[Problems to be solved by the device]

 However, when a conductive film is printed on a resin film, the film such as polyester is bent to turn the switch on and off, so if the number of times is repeated, the film inevitably becomes fatigued, and Had the problem of being damaged by overload. In addition, this switch has the problem that when a heavy load far exceeding the operating load is applied, the polyester film plastically deforms and the electrodes are in close contact with each other and the restorability is lost, and the conductive paint is damaged by compressive force. there were. The present invention solves such a problem, and provides a sheet-like switch capable of instantly restoring the deformation of the electrode plate and turning off the switch even when a high load is removed.

[0004]

[Means for Solving the Problems]

 In the sheet-like switch of the present invention, two electrode plates are superposed and interposed between a pair of resin films having a circuit formed of a conductive member, and the conductive member is brought into contact with each electrode plate and the electrode In a sheet-shaped switch in which a spacer is arranged between plates and 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 projected from the other electrode plate. The projection is fixed on the resin film on which the other electrode plate is installed. The present invention also includes the sheet-like switch according to claim 1, wherein a reinforcing plate is fixed to the resin film near the electrode plate.

[0005]

[Action]

 In the above-mentioned sheet-shaped switch, spacers are sandwiched between electrode plates arranged between resin films and having different lengths, and both ends of the long electrode plate are projected from the short electrode plate, and these projecting parts are made into short films. By fixing on the resin film on which the electrode plate is installed, the long electrode plate is curved and separated from the short electrode plate. Therefore, even if a load is applied to the switch and the load is removed, the long electrode plate is instantly separated from the short electrode plate and restored to its original position. Also, if a reinforcing plate is installed near the electrode plate, the force applied to the electrode plate can be dispersed and a larger load can be applied.

[0006]

【Example】

 FIG. 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 upper electrode plate 2 such as phosphor bronze having elasticity and conductivity is used. The lower electrode plate 3 and the lower electrode plate 3 are arranged in a state of being stacked between a pair of resin films 4 made of a synthetic resin such as polyester or polyimide. A spacer 5 and an 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, and the thickness thereof is a distance between the upper electrode plate 2 and the lower electrode plate 3, which is 0.025 to 0. A range of 0.5 mm is preferred. If it is less than 0.025 mm, the gap between the upper electrode 2 and the lower electrode plate 3 becomes too small, which may lead to malfunction of the switch. If it exceeds 0.5 mm, the amount of bending of the upper electrode plate 2 becomes large, and the operating load of the switch becomes large.

Therefore, in the present invention, the upper electrode plate 2 is longer than the lower electrode plate 3, both ends of the upper electrode plate 2 project from the ends of the lower electrode plate 3, and the projecting portions 9, 9 are lower electrodes. 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. Therefore, the upper electrode plate 2 has a curved shape with the projecting portion 9 as a reference, and the upper electrode plate 2 located between the spacers 5 and 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 turn on the switch, and when the load is removed, the upper electrode plate 2 instantly separates from the lower electrode plate 3 and restores to turn off the switch.

FIG. 3 is 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 the reinforcing plate 11 is installed near the upper and lower electrode plates 2 and 3 and is different from the switch shown in FIG. That is, the reinforcing plate 11 is arranged before and after the upper and lower electrode plates 2 and 3 to be fixed to the resin film 4, and the insulating tape 12 is laminated on the reinforcing plate 11 to insulate the conductive member 8. Therefore, when a load is applied to the switch 1, the reinforcing plate 11 also carries the load and the force applied to the upper and lower electrode plates 2 and 3 is dispersed, so that a larger load can be applied to the switch 1. The switch 1 can be used as a sensor capable of sensing the water level, for example, by arranging a plurality of switches 1 on the substrate 13 at regular intervals as shown in FIG.

The effect of the resilience of the switch of the present invention will be confirmed below. This switch is basically the same as the structure shown in FIG. Prepare two resin films made of polyester with a thickness of 175 μm with conductive paint applied as a circuit, and fix the lower electrode plate made of a 8 × 60 × 0.1 mm line bronze plate to one resin film with adhesive tape. At the same time, the conductive paint is brought into contact. Then, an upper electrode plate made of a phosphor bronze plate of 8 × 75 × 0.1 mm is placed and fixed with spacers made of a polyester resin having a thickness of 100 μm spaced at an interval of 40 mm, and the spacers are stacked on the lower electrode plate and projected from the lower electrode plate. The formed part was fixed on the resin film with an adhesive tape, and the other resin film was covered with 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 spacers made of polyester resin with a single-sided adhesive layer having a thickness of 100 μm are provided at upper and lower electrodes with a space of 40 mm. It was placed and fixed between the plates. The operating load of this switch is 3 g.

After applying a load of 30 kg / 10 cm × 10 cm to these switches at 60 ° C. for one day, the electrical resistance value when the switches were removed was measured. As a result, the electrical resistance value of the switch of this example instantly exceeded 10 MΩ, but it took 5 minutes for the switch of the comparative example to reach 10 MΩ.

[0013]

[Effect of the device]

 As described above, in the sheet-like switch of the present invention, the spacers are sandwiched between the electrode plates arranged between the resin films, and the both ends of the long electrode plate are projected from the short electrode plate. By fixing the protruding part to the resin film on which a short electrode plate is installed, the long electrode plate is curved and fixed, so that the electrode plates are separated. Therefore, even if a load is applied to the switch and the load is removed, the electrode plate instantly separates and restores its original position. Also, if a reinforcing plate is installed near the electrode plate, the force applied to the electrode plate can be dispersed and a larger load can be applied.

[Brief description of 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-shaped switch according to the present invention.

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

[Explanation of symbols]

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

Front page continuation (72) Keiji Morikami 4-1-21, Hamazoe-dori, Nagata-ku, Kobe Mitsuboshi Belt Co., Ltd. (72) Kozo Yokoyama 4-1-21, Hamazoe-dori, Nagata-ku, Kobe Hoshi Belt Co., Ltd.

Claims (2)

[Scope of utility model registration request] 1. A pair of resin films, each of which has a circuit formed of a conductive member, are superposed with two electrode plates interposed therebetween to bring the conductive member into contact with each electrode plate, and a spacer is arranged between the electrode plates. In a sheet-shaped switch having a space between the electrode plates, the two electrode plates have different lengths, and both end portions of one electrode plate are projected from the other electrode plate, and the projecting portion is the other. A sheet-shaped switch characterized in that it is fixed on a resin film on which the electrode plate is installed. 2. The sheet-shaped switch according to claim 1, wherein a reinforcing plate is fixed to the resin film in the vicinity of the electrode plate.