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:
Apr. 19, 2011
Filed:
Jun. 28, 2007
Chota Matsumoto, Tondabayashi, JP;
Hiroshi Yuuki, Kobe, JP;
Chota Matsumoto, Tondabayashi, JP;
Hiroshi Yuuki, Kobe, JP;
Other;
Shinko Seiki Company, Limited, Kobe-Shi, Hyogo, JP;
Abstract
An unpolarized light beam emitted from a target presenting light source () is collimated by a collimator lens (), and is made to be incident on a target presenting liquid crystal shutter (), while an unpolarized light beams emitted from a background presenting light source () is collimated by a collimator lens (), and is made to be incident on a background presenting liquid crystal shutter (). The liquid crystal shutters () have shutter patterns which are reverses to each other. The target and background light beams emerging from said liquid crystal shutters () are combined with each other, together with their polarization states, by a half prism () acting as combining means. The resultant unpolarized light beam resulting from the combining is projected through a magnifying optical system () onto an eye to be examined. Since an unpolarized light beam is projected onto the eye, reliable examination, unaffected by polarization, can be realized.