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. 11, 1998
Filed:
Dec. 27, 1994
Applicant:
Inventors:
Mitsujiro Konno, Hoya, JP;
Shinya Matsumoto, Machida, JP;
Toshikazu Takayama, Hachioji, JP;
Takayuki Suzuki, Hachioji, JP;
Akira Hasegawa, Akishima, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
359739 ; 359708 ;
Abstract
An optical system for endoscopes which comprises a stop having a variable aperture and is configured so as to produce spherical aberration for preventing an image surface thereof from being shifted in a direction opposite to the object side by narrowing the aperture of the stop, whereby the optical system is free from insufficiency in brightness and degradation in resolution thereof on a side farther from the optical system within a depth of field thereof, and has another side of the depth of field brought close to the optical system.