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:
Dec. 02, 2003
Filed:
Feb. 25, 2002
Yasuo Yonezawa, Zushi, JP;
Nikon Corporation, Tokyo, JP;
Abstract
In order to provide a microscope episcopic illumination device and a microscope therewith having simple structure, having an aperture diaphragm and a field stop, and being capable of setting optimum light source magnification in accordance with change of an image surface size required for from eyepiece observation to TV observation. The microscope episcopic illumination device has a light source, a collector lens, an aperture diaphragm, a light source image forming lens portion for forming an image of the light source in the vicinity of the aperture diaphragm, pupil relay lens groups for re-forming the image of the light source formed in the vicinity of the aperture diaphragm in the vicinity of a pupil surface of an objective lens, and a field stop. The lens portion is a lens system with a variable finite focal distance, and varies a projection magnification of a ratio of the re-formed image of the light source in the vicinity of the pupil surface to the light source by changing the focal distance thereof.