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:
Sep. 19, 1978
Filed:
Nov. 05, 1976
Applicant:
Inventor:
Takeshi Muryoi, Chigasaki, JP;
Assignee:
Nippon Kogaku K.K., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350187 ; 350184 ;
Abstract
The disclosure describes a zoom lens barrel capable of macro-photography on which a special switch ring is provided. The switch ring is externally operable and has a cam slot comprising zooming portion and macro portion. The zoom portion is shaped to allow either of a compensator lens group or a variator lens group to move toward the direction of the optical axis of lens whereas the macro portion is so shaped not to allow it. Upon the rotation of the switch ring, a direct switchover from zooming portion to macro portion is made so as to permit macro-photography at any desired focal length.