Pressure sensor

Abstract

To improve the detection accuracy of pressing force in a pressure-sensitive sensor. In a pressure-sensitive sensor (3), a pressure-sensitive layer (17) opposes to a first electrode pattern (21A) and asecond electrode pattern (21B) through spaces. The first electrode pattern (21A) has a plurality of first electrodes (31); first coupling portions (33) coupling the plurality of first electrodes (31); and first wiring portions (35) extending from first end portions (37) of the first coupling portions (33). The second electrode pattern (21B) has a plurality of second electrodes (41) alternately disposed with the first electrodes (31), second coupling portions (43) coupling the plurality of second electrodes (41), and second wiring portions (45) extending from second end portions (49) of the second coupling portions (43). The second wiring portion (45) extends so as to make the resistance of a conduction path between an output end of the first wiring portion (35) and an output end of the second wiring portion (45) substantially same in any combination of the first electrode (31) and the second electrode (41), when the first electrode (31) and the second electrode (41) adjacent to each other are electrically conducted through the pressure-sensitive layer (17).

Description

technical field [0001] The present invention relates to a pressure-sensitive sensor, in particular to a pressure-sensitive sensor in which a pressure-sensitive layer and a pair of electrode patterns are oppositely arranged through a space. Background technique [0002] Conventionally, a pressure-sensitive sensor is known as a device having a pressing detection function for detecting a pressing force (for example, refer to Patent Document 1). [0003] The pressure sensor 1 described in Patent Document 1 has a pressure-sensitive thin film 3 and electrodes 41 and 42 , and both face each other with a space therebetween. Figure 11 The electrodes 41, 42 are shown in the shape of comb teeth. When a pressing force is applied, a pair of comb teeth of the electrodes 41 and 42 are connected to each other through the pressure-sensitive film 3 . Thus, the pressure detection unit detects the pressing force based on the resistance values ​​of the electrodes 41 and 42 and the pressure-sen...

AI Technical Summary

Problems solved by technology

[0008] In addition, when the pressing position is different, the length of the conduction path of the electrode wiring may vary greatly regardless of the magnitude of the pressing force.

Therefore, even with the same pressing force, the resistance of the entire conduction path varies depending on the pressing position.

However, in the case of a pressure-sensitive sensor for general membrane switch replacement, since the above-mentioned contact resistance is sufficiently larger than the resistance of the conduction path of the electrode wiring, even if the variation in the resistance of the conduction path of the electrode wiring is ignored, no problem

[0009] On the other hand, in an enlarged pressure-sensitive sensor, since the ratio of the resistance of the conduction path of the electrode wiring increases, the difference may cause a large difference in the resistance detection value with respect to the pressing force.

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