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:
Mar. 01, 1977
Filed:
May. 01, 1975
Applicant:
Inventor:
Ryusho Hirose, Machida, JA;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350184 ; 350 39 ; 350176 ; 350183 ; 350196 ;
Abstract
A zoom lens device comprises a zooming section including a group of focusing lenses, a group of variator lenses and a group of compensator lenses, and a relay section for focusing the light beam from the zooming section. The zoom lens device permits its zooming section alone to be interchanged with another zooming section. By fitting this other zooming section to the relay section, the zoom lens device having different magnification, and so on can be obtained. The light beam from this other zooming section is substantially equal in aberration and image forming conditions to the light beam from the original zooming section.