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:
Dec. 02, 2003
Filed:
Jun. 18, 2002
Seigo Hasunuma, Gunma, JP;
Hosiden Corporation, Osaka, JP;
Abstract
In a keyboard that comprises a membrane switch sheet having switch portions arranged all over it, a keyboard substrate and a keyboard frame having sandwiched therebetween the membrane switch sheet to provide therein rigidity, and actuators for ON/OFF control of the switch portions through openings made in the keyboard frame, the keyboard substrate and the keyboard frame are each formed by a thin aluminum sheet, the membrane switch sheet has plural through holes, and plural trapezoidal bumps or protrusions formed by stamping the keyboard substrate toward the keyboard frame are inserted through the plural through holes into surface-to-surface contact with the keyboard frame, the plural trapezoidal bumps being spot-welded in their flat top surfaces to the keyboard frame.