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:
Jan. 18, 2005
Filed:
Sep. 24, 2002
Applicants:
Yasuhide Iwamoto, Kawasaki, JP;
Satoshi Sano, Kawasaki, JP;
Fumihiko Nakazawa, Kawasaki, JP;
Nobuyasu Yamaguchi, Kawasaki, JP;
Inventors:
Yasuhide Iwamoto, Kawasaki, JP;
Satoshi Sano, Kawasaki, JP;
Fumihiko Nakazawa, Kawasaki, JP;
Nobuyasu Yamaguchi, Kawasaki, JP;
Assignee:
Fujitsu Limited, Kawasaki, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01J 4014 ;
U.S. Cl.
CPC ...
Abstract
The position of a light blocking object is detected not only within a display screen, but also outside the display screen. With the use of the function of detecting the position in a region outside the display screen, it becomes possible to provide virtual buttons in this region and detect dust around a light retro-reflector. Dirt on the light retro-reflector is detected based on the levels of light receiving signals of optical units.