SWITCH STRUCTURE OF KEY SHEET MODULE

摘要

PROBLEM TO BE SOLVED: To decrease the price of a key switch module by constructing a switch structure of a key switch module with a one-side circuit substrate without using a both-sides circuit substrate. SOLUTION: This key sheet module comprises a first stationary contact 5 formed on a top surface of an FPC substrate 4, a second stationary contact 6 formed to surround a periphery of the first stationary contact 5 and having a wiring passage 8 for passing a wiring pattern 7 extending from the first stationary contact 5, and a almost dome-shaped movable contact 9 disposed on the second stationary contact 6 to cover an upper part of the first stationary contact 5 and always not contacting with the first stationary contact 5; and further comprises a conductive portion 9a contacting with the second stationary contact 6 at the peripheral portion of the movable contact 9 and a non-conductive portion 9b striding over the wiring passage 8 so as to maintain non-contact with a wiring pattern 7 extending from the first stationary contact 5. COPYRIGHT: (C)2005,JPO&NCIPI