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:
Jan. 31, 1989
Filed:
Mar. 20, 1987
Applicant:
Inventors:
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01J / ;
U.S. Cl.
CPC ...
250205 ; 250227 ; 350336 ;
Abstract
An endoscope provided with a stop comprising an annular electrochromic element arranged in an objective lens unit so that the transmittance of the stop is varied in accordance with the amount of light from an object to be observed which has been measured, in order to prevent brightness in a field of view from being rapidly changed when the distance from the distal end portion of the endoscope to the object to be observed is varied.