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:
Mar. 09, 1999
Filed:
Apr. 07, 1997
Applicant:
Inventor:
Hiroyuki Nishida, Hachioji, JP;
Assignee:
Olympus Optical Co., Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G02B / ; G02B / ;
U.S. Cl.
CPC ...
359 15 ; 359385 ; 359599 ;
Abstract
An illumination optical system to be disposed between a light source and a specimen comprises, in order from a light source side, a collector lens, a diffusing plate having a diffusing surface, a light source image projecting lens, and a condenser lens. A field stop is arranged between the diffusing plate and the light source image projecting lens, and an aperture stop is arranged between the light source image projecting lens and the condenser lens. The illumination optical system can attain an ideal numerical aperture and provide uniform and bright illumination light over a predetermined area upon diffusion characteristics on the diffusing surface being adjusted.