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:
Feb. 19, 2002
Filed:
Oct. 19, 2000
Shinji Okamori, Tokyo, JP;
Shinsuke Shikama, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A prism ( ) comprises a first inner surface ( A) that performs total reflection of all rays ( ) entering from the exterior and allows ON light ( ) to pass therethrough; a second inner surface ( ) that allows the rays ( ) and the ON light ( ) to pass therethrough and performs total reflection of OFF light ( ); and a third inner surface ( ) that allows the ON light ( ) to pass therethrough. A first end ( E ) of the first inner surface ( A) is located in proximity to and above a predetermined point (P) in the second inner surface ( ). The prism ( ) is regarded as a plane parallel plate having a second outer surface ( ) and a third outer surface ( ).