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. 24, 2020
Filed:
Sep. 12, 2018
Applicant:
Ricoh Company, Ltd., Tokyo, JP;
Inventors:
Assignee:
RICOH COMPANY, LTD., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B 3/00 (2006.01); G03B 21/62 (2014.01); G02B 3/04 (2006.01); G02B 3/06 (2006.01); H04N 9/31 (2006.01); G02B 26/08 (2006.01); G02B 27/01 (2006.01); G09G 3/02 (2006.01);
U.S. Cl.
CPC ...
G02B 3/0056 (2013.01); G02B 3/0037 (2013.01); G02B 3/04 (2013.01); G02B 3/06 (2013.01); G02B 26/0833 (2013.01); G02B 27/0101 (2013.01); G03B 21/62 (2013.01); H04N 9/3129 (2013.01); H04N 9/3155 (2013.01); H04N 9/3182 (2013.01); G02B 27/01 (2013.01); G02B 2027/011 (2013.01); G02B 2027/0118 (2013.01); G02B 2027/0145 (2013.01); G09G 3/02 (2013.01);
Abstract
A screen member irradiated with image display light is provided. The screen member includes an optical element having an optical surface configured to reflect or refract light, wherein an absolute value of a local curvature of the optical surface changes in one direction of a plane perpendicular to an optical axis of the optical element, and becomes a local minimum at at least one position.