The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 09, 1998
Filed:
May. 13, 1996
Pin-Chien Liao, Taoyuan, TW;
Acer Pheripherals, Inc., Taoyuan, TW;
Abstract
A membrane switch including a plurality of upper dot-pads and a plurality of lower dot-pads is provided to enhance the operational sensitivity while avoiding unexpexted actuation of membrane switch is provided. The plurality of upper dot-pads are provided during the print process of the top switch-pad and distributed to surround the top switch-pad. A plurality of lower dot-pads corresponding the plurality of upper dot-pads are provided during the print process of the bottom switch-pad and distributed to surround the bottom switch-pad. Each of the plurality of upper dot-pads has a lower-edge and each of the plurality of lower dot-pads has an upper-edge. As the top membrane is free of an external force, the lower-edge of top switch-pad is spaced from the upper-edge of bottom switch-pad by a first dimension greater than a second dimension by which the lower-edge of each upper dot-pad is spaced from the upper-edge of each lower dot-pad. The top switch-pad contacts with the bottom switch-pad following the contact of the plurality of upper dot-pads with the plurality of corresponding lower dot-pads as the top membrane is deformed by the external force thereby making a better actuation sensitivity of the membrane switch.