US 6,982,394 B2 | ||
Keysheet module | ||
Hidehiko Ide, Yamanashi (Japan); and Isao Miyashita, Fujiyoshida (Japan) | ||
Assigned to Citizen Electronics Co., Ltd., Yamanashi (Japan) | ||
Filed on Dec. 02, 2004, as Appl. No. 11/1,033. | ||
Claims priority of application No. 2003-407787 (JP), filed on Dec. 05, 2003. | ||
Prior Publication US 2005/0121299 A1, Jun. 09, 2005 | ||
Int. Cl. H01H 13/70 (2006.01) |
U.S. Cl. 200—516 | 4 Claims |
1. A keysheet module having a flexible printed circuit board formed with a plurality of depression switches on an upper surface
thereof, each of the depression switches comprising:
a first fixed contact;
a second fixed contact surrounding the first fixed contact;
a movable contact arranged over the fixed contacts to electrically connect and disconnect the first fixed contact and the
second fixed contact; and
a switch holding sheet arranged on the flexible printed circuit board to cover and hold the movable contact;
wherein an insulating film formed by an insulating paste is formed on the flexible printed circuit board and the insulating
film includes air holes formed to release air trapped in the movable contact; and
wherein a protruding deformation prevention wall is formed in each of the air holes provided in the insulating film to prevent
the switch holding sheet from being deflected into the air holes.
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