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:
Aug. 08, 1978
Filed:
Oct. 08, 1976
Kabushiki Kaisha Suwa Seikosha, Tokyo, JP;
Abstract
A touch sensitive input particularly suited for use with an electronic wristwatch, an electronic calculator or a combination thereof is provided. The touch sensitive input includes a touch sensitive contact connected to the input of a detector circuit, the detector circuit input being normally referenced to a first potential for producing a detector circuit output signal representative of the first potential. Engagement of the touch sensitive contact selectively references the detector circuit input to a second potential and in response thereto produces a detector circuit output signal representative of the second potential. The detector circuit includes at least an MOS or C-MOS input stage. Additional circuitry is provided for eliminating chatter in the output signal produced by the input stage, for preventing the producing of two signals representative of the unintended engagement of more than one touch sensitive contact, and for providing an indication that a touch sensitive contact has been inadvertently engaged.