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. 28, 2021
Filed:
Dec. 27, 2019
Applicant:
Keyence Corporation, Osaka, JP;
Inventor:
Hajime Matsuda, Osaka, JP;
Assignee:
KEYENCE CORPORATION, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01C 5/00 (2006.01); G02F 1/139 (2006.01);
U.S. Cl.
CPC ...
G02F 1/1396 (2013.01); G01C 5/00 (2013.01); G02F 2203/48 (2013.01);
Abstract
To miniaturize an illumination device while meeting requirements of angle characteristics of a liquid crystal panel. A light sourceis arranged above an outer end portion side of a liquid crystal panelthat is positioned radially outward of an illumination housing. A relative position between the liquid crystal paneland the light sourceis set such that light emitted from the light sourceis incident within an effective angle range of the liquid crystal panel