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:
Dec. 10, 1996
Filed:
Apr. 21, 1994
Applicant:
Inventor:
Hitoshi Mukaiya, Yokohama, JP;
Assignee:
Canon Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359687 ; 359684 ; 359708 ;
Abstract
A rear focus type zoom lens including, in succession from the object side, a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit of positive refractive power having a stop, the third lens unit having at least two positive lenses and a negative lens which is most adjacent to the image plane side, and a fourth lens unit of positive refractive power consisting of a positive lens and a negative lens, the second lens unit and the fourth lens unit being moved to effect zooming, the fourth lens unit being moved to effect focusing.