Key switch
AssigneesCitizen Electronics Co., Ltd., Citizen Watch Co., Ltd.
InventorMasashi Watanabe
Life of this patent
Estimating the term…
Abstract
A key switch includes a base plate, a key top, a pair of link members, and a switch mechanism. The key top is above the base plate. The link members support the key top and operate in an interlocked manner to allow the key top to be lifted and lowered with respect to the base plate. One of the link members includes a projecting portion at a distal end of an arm of the link member. The other one of the link members includes a concave receiving portion at a distal end of an arm of the link member. The projecting portion is rotationally fitted to the concave receiving portion. The switch mechanism is disposed between the base plate and the key top and is configured to open and close a contact portion of an electric circuit in accordance with lifting and lowering operation of the key top.
Claims9
A key switch comprising:
- a base plate;
- a key top above the base plate;
- a pair of link members supporting the key top and configured to operate in an interlocked manner to allow the key top to be lifted and lowered with respect to the base plate;
- and
- a switch mechanism disposed between the base plate and the key top and configured to open and close a contact portion of an electric circuit in accordance with lifting and lowering operation of the key top, the switch mechanism comprising:
- a sheet-shaped switch member disposed on an upper surface of the base plate and comprising a contact portion of an electric circuit;
- a plate-shaped spring member above the contact portion of the electric circuit;
- and
- a housing secured to the base plate and accommodating the plate-shaped spring member.
Dependencies are inferred from the claim text.