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:
Apr. 20, 1999
Filed:
May. 29, 1997
Hidenori Miyamoto, Urayasu, JP;
Hiroshi Wakabayashi, Yokohama, JP;
Nikon Corporation, Tokyo, JP;
Abstract
Disclosed is a lens barrel capable of restraining an error of an inter-lens spacing accuracy in a lens frame down to several .mu.m or under. The lens barrel has a plurality of lenses, and a lens frame for holding these lenses at predetermined intervals to make optical axes of the lenses coincident. Provided are at least three steel balls contiguous to lens surfaces, facing to each other, of the two lenses among those lenses. The three steel balls are disposed so that the centers of the steel balls are positioned on the same circumference about the lens optical axis. The steel balls are in contact with substantially trisected portions along an inner peripheral surface having an inside diametrical dimension smaller than a maximum inside diameter portion formed in the lens frame. The lens frame is provided with wall portions for regulating motions of the steel balls in the circumferential and radial directions.