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:
Aug. 23, 2011
Filed:
Apr. 07, 2009
Applicants:
Takao Endo, Tokyo, JP;
Yuzo Nakano, Tokyo, JP;
Hayato Takeuchi, Tokyo, JP;
Inventors:
Assignee:
Mitsubishi Electric Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/10 (2006.01); G02B 27/44 (2006.01); G02B 3/08 (2006.01);
U.S. Cl.
CPC ...
Abstract
A transparent screen is constructed in such a way that a plurality of Fresnel prismseach of which is smaller than a plurality of Fresnel prismsand has a shape approximately similar to that of each of the plurality of Fresnel prismsare arranged in a sawtooth shape on a non-light incidence surface portion of a Fresnel lenson a light incidence side to which any image light PB applied from a projectoris not applied directly because blocked by a Fresnel prismplaced frontwardly.