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:
Oct. 09, 1984
Filed:
Mar. 05, 1982
Tadashi Kimura, Tokyo, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
An Epidark illumination system wherein an optical member for forming the image of a light source is provided in a dark field light path to illuminate a sample with the light from the image of the light source in order to be able to make a uniform bright illumination with a simple formation. The optical member can be any of a ring-shaped convex lens or concave lens, a ring-shaped multi-element lens made by arranging a plurality of convex lenses or concave lenses in the same plane, a compound cylindrical lens made by concentrically circularly arranging cylindrical lenses, a radial lens and a multi-element lens made by arranging a plurality of concentric ring-shaped lenses so that the surfaces of the lenses may be higher in turn outward from the center. Further, a light collecting lens or a light collecting mirror may be arranged in the dark field light path.