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. 05, 1994
Filed:
Jun. 25, 1992
Masayu Higuchi, Hachioji, JP;
Yuichi Torikoshi, Shiroyama, JP;
Hiroshi Terada, Mitaka, JP;
Takeshi Ito, Hachioji, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A lens barrel of the present invention directly detects the lens-to-lens spacing between a focusing lens and another lens, whose position relative to the focusing lens exerts the largest influence upon a focused condition, by a measurement detector and, depending on an output indicative of the measured spacing, a controller drives the focusing lens through a driver to a proper in-focus condition. Accordingly, a very valuable advantage results in that a focusing position error of the focusing lens group, which has been encountered in the prior art, can be avoided to enable effective and high-accuracy focusing operation and control through a simplified structure.