| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce a contact failure due to foreign substances, by making the foreign substances in an air collecting chamber hard to be sucked into a contact chamber. <P>SOLUTION: A switch device includes a substrate having a fixed contact, and a rubber sheet 13. The rubber sheet 13 has a contact dome portion 19, a moving contact 20, a first recessed portion 21, a second recessed portion 22, a guiding groove 23, a reverse stopping portion 24, and a ventilation groove 25. A contact chamber 26, an air collecting chamber 27, a foreign substance collecting chamber 28, a guiding passage 29, and a ventilation passage 30 are formed between the rubber sheet 13 and the substrate. The guiding passage 29 communicates the air collecting chamber 27 and the foreign substance collecting chamber 28. The ventilation passage 30 communicates the contact dome portion 19 and the guiding passage 29. The moving contact 20 contacts/separates to/from the fixed contact with the elastic deformation of the contact dome portion 19. At that time, the contact chamber 26 breathes, and the foreign substances sucked from the air collecting chamber 27 to the guiding passage 29 are guided by the guiding passage 29 so as to enter the foreign substance collecting chamber 28, and a backflow is prevented by the reverse stopping portion 24. <P>COPYRIGHT: (C)2012,JPO&INPIT |
