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:
Feb. 01, 1994
Filed:
Jan. 27, 1992
James K Chan, Rancho Palos Verdes, CA (US);
Other;
Abstract
Low-cost devices for touch control by using a matrix of discrete composite switch contacts in close proximity, and x and y terminal measurable parameter such as resistance for touch position sensing and encoding. When a touch position is touched, the corresponding composite switch contacts simultaneously short a proportional portion of the x and y terminal resistance. These terminal resistance values are then converted to digital x and y cordinates of the touched position by A/D converters. Also, that the resistance between the last position sensing conductor and the ground return is three to five times larger than the resistance between all the other position sensing conductors of the first and second sheet eliminates the occasional error of detecting the normally untouched state as a touched state.