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:
Nov. 02, 1999
Filed:
Aug. 07, 1997
Toshiyuki Toyofuku, Hachioji, JP;
Yasuo Isashi, Sagamihara, JP;
Fuminori Ueno, Hachioji, JP;
Shigeo Hayashi, Okaya, JP;
Olympus Optical Co., Inc., Tokyo, JP;
Abstract
A photographic lens unit having a stepping motor to drive a cam ring that has a cam portion for driving a counter-cam portion of a lens frame for automatic focus of photographic lenses, and projections for driving a diaphragm. The cam ring is rotated for moving the counter-cam portion in an optical-axis direction with the counter-cam portion in contact with the cam portion. Automatic focus of the photographic lenses and photometry are carried out. Thereafter, the cam ring is further rotated so that the projection can bring the diaphragm to an aperture-narrowing state. The cam ring is then rotated reversely for moving the photographic lenses to an automatic focus position. Photographic operations are then carried out. After photography is completed, the diaphragm is reset by moving the counter-cam portion. The photographic lens unit is thus brought to a ready state for subsequent photography. According to this photographic lens unit, since the driven part enabling automatic focus and the diaphragm can be driven by a simple driving mechanism, the structure of the photographic lens unit can be simplified and a space occupied by the photographic lens unit can be limited.