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:
Aug. 20, 1996
Filed:
Jan. 21, 1994
Applicant:
Inventors:
Hiroshi Tsuyuki, Tokyo-to, JP;
Akira Kikuchi, Tokyo-to, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo-to, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61B / ;
U.S. Cl.
CPC ...
600175 ; 600176 ; 600173 ; 600160 ; 359239 ;
Abstract
An objective optical system for endoscopes comprising a plurality of lens components and an aperture stop, and configured so as to permit adjusting a distance to an object to be observed simply by exchanging a lens component disposed in the vicinity of the aperture stop with another lens component having a focal length different from that of the lens component disposed in the vicinity of the aperture stop. This objective optical system for endoscopes can have an optimum depth of field by changing a diameter of the aperture stop along with the exchange of the lens component disposed in the vicinity of the aperture stop.