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. 10, 2009
Filed:
Dec. 08, 2004
Yasuhiro Takahashi, Saitama-ken, JP;
Ryuji Ohmuro, Tochigi-ken, JP;
Tetsuo Sakanaka, Kanagawa-ken, JP;
Yasuhiro Takahashi, Saitama-ken, JP;
Ryuji Ohmuro, Tochigi-ken, JP;
Tetsuo Sakanaka, Kanagawa-ken, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A free space optics communication apparatus which performs optical axis correction with high accuracy is disclosed. The free space optics communication apparatus of the present invention includes a first light receiving element and a second light receiving element, a light converging optical system which converges a light flux incident from the outside to form a spot of the light flux on each of light receiving surfaces of the first and second light receiving elements, and information producing section which combines outputs from the first and second light receiving elements to produce information on positions of the spots. The spots formed on the light receiving surfaces of the first and second light receiving elements have a point-symmetrical relationship.