| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem that a contact part is mechanically operated at the moment of contact by a conventional contact evaluation means to turn electrical contact on/off or to produce an electric field by a piezoelectric element but, when high sensitivity is ready to obtain by this method, erroneous operation increases, irregularity is caused between contacts in a contact sensor when a support is curved, operation itself becomes irregular and no accurate operation is obtained and, in a conventional mechanical switch type contact sensor, transparentization becomes difficult and it is difficult to use transparent glass or plastic itself, for example, in a showcase or the like for the purpose of prevention of crimes. SOLUTION: As remedial measures for the problem, a principle wherein the light guided through a light guide passage is largely attenuated when matter comes into contact with the guide surface of the light guide passage is used to enable simple high sensitivity detection. Further, if a detection part is curved, the contact sensor is operated without causing a problem. The detection part can be made transparent as a whole by making a support transparent. COPYRIGHT: (C)2006,JPO&NCIPI |
