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:
Mar. 27, 2012
Filed:
Sep. 21, 2009
Yasunori Hiyoshi, Suwa, JP;
Yasunori Hiyoshi, Suwa, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A sensing circuit includes: a data generating section for generating data representing the amount of light received by a plurality of optical detection circuits, which are provided in a detection region, for each unit period on the basis of detection signals output from the plurality of optical detection circuits; a setting section for variably setting a differential unit period number which is the number of unit periods between two unit periods having a difference to be acquired; a difference data generating section for sequentially generating difference data between the data, which is generated by the data generating section in the current unit period, and the data, which is generated by the data generating section in the unit period previous to the current unit period by the differential unit period number, for each of a plurality of the unit periods; and an approach detecting section for detecting whether or not an object is approaching the detection region on the basis of the difference data generated by the difference data generating section.