| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a key switch which reduces the operation sound and excels in quietness while securing clear click feeling and high contact reliability. <P>SOLUTION: A seismic isolation sheet 20 is provided between a circuit board 10 and snap plates 40. Through holes 21 are provided in positions corresponding to each fixed contact 13 on the seismic isolation sheet 20, and each snap plate 40 is provided on a seismic isolation sheet 40 so as to span the through holes 21. Further, a first fixed contact 14 and a second fixed contact 15 are formed on an upper surface 10a of the circuit board 10. The respective fixed contacts have pectinated patterns and the patterns engage with each other so as to have a predetermined gap L3 therebetween. Further, a recessed portion 42, having a flat bottom portion, is provided at a center part of each snap plate 40. The bottom portion of the recessed portion 42 is formed so as to have a diameter which spans at least one tooth line 14b of the first fixed contact 14 and at least one tooth line 15b of the second fixed contact 15 which is located adjacent to the tooth line 14b. <P>COPYRIGHT: (C)2012,JPO&INPIT |
