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:
May. 04, 2004
Filed:
Mar. 16, 2000
Applicant:
Inventors:
Atsushi Tanaka, Yamato, JP;
Masahide Hasegawa, Yokohama, JP;
Kiwamu Kobayashi, Yokohama, JP;
Masaaki Kanashiki, Yokohama, JP;
Yuichiro Yoshimura, Kamakura, JP;
Katsuyuki Kobayashi, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G09G 5/00 ; G08C 2/100 ;
U.S. Cl.
CPC ...
G09G 5/00 ; G08C 2/100 ;
Abstract
A device has a light-receiving element for receiving light coming from a pointing tool, and a plurality of linear sensors for sensing a beam spot. A controller discriminates if a first signal output from the light-receiving element and a second signal output from the linear sensors are synchronized. A coordinate computation unit outputs a coordinate value corresponding to the beam spot on the basis of the discrimination result.