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. 14, 1989
Filed:
Oct. 16, 1987
Yoshihiro Shimada, Tokyo, JP;
Tadafumi Fujihara, Tokyo, JP;
Chikara Nagano, Tokyo, JP;
Katsuo Tsukamoto, Sendai, JP;
Olympus Optical Co., Ltd., Tokyo, JP;
Abstract
A schlieren optical device using diode emitting monochromatic light as spot light source so as to have a compact and light-weight design, low calorific power, and low power consumption, and assure high reliability. In said optical device, imaging lens consists of a pair of lens groups arranged with an airspace reserved therebetween, knife edge consists of a light-shielding coating arranged on the surface of one of said lens groups and the other lens group is displaceable along the optical axis. Said optical device comprises a schlieren optical system and an optical system of a transmission type of microscope having optical axes perpendicularly intersecting with each other at the position of a sample, or a pair of schlieren optical systems and an optical system of a transmission type of microscope having optical axes perpendicularly intersecting with one another.