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. 08, 2002
Filed:
Jun. 18, 1998
Applicant:
Inventors:
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B 3/00 ;
U.S. Cl.
CPC ...
G02B 3/00 ;
Abstract
An optical element is provided that allows accurate measurement of the shapes of the element and its surfaces which light is bound to strike, a jig is provided for holding the optical element, and an apparatus such as an image pickup apparatus or display apparatus is provided which includes the optical element. This optical element is characterized in that it includes surfaces which light is bound to strike and reference portions indicating the reference positions of the shapes of the surfaces, and the reference portions have curved surfaces defining points corresponding to the reference positions.