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. 07, 1985
Filed:
Dec. 22, 1982
Applicant:
Inventors:
Sadatoshi Takahashi, Tokyo, JP;
Sadahiko Tsuji, Kanagawa, JP;
Akira Tajima, Kanagawa, JP;
Toshiaki Asano, Kanagawa, JP;
Setsuo Minami, Kanagawa, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350427 ;
Abstract
A zoom objective comprising four lens groups of which the first three lens groups counting from the object side are movable for zooming, whereby the refractive powers and the conditions of zooming movement of the aforesaid three lens groups are properly specified so as to improve the compactness while still maintaining good correction of aberrations.