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. 27, 2004
Filed:
May. 29, 2002
Hiroshi Suzuki, Tokyo, JP;
Kohei Teramoto, Tokyo, JP;
Yoshihiro Ashizaki, Tokyo, JP;
Shinsuke Sikama, Tokyo, JP;
Hiroshi Sekiguchi, Tokyo, JP;
Tadahiko Ryuugou, Tokyo, JP;
Kuniko Kojima, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A Fresnel lens has a plurality of pitch areas in which a plurality of hybrid type prism portions are arranged. Each hybrid type prism portion has a refraction type prism portion and a total reflection type prism portion. In the refraction type prism portion, a ray of incident light Li of an incident angle “an” is refracted twice and goes out as a ray of outgoing light Lo of an outgoing angle “f”. In the total reflection type prism portion, a ray of incident light Li of the incident angle “a” is refracted, totally reflected and refracted in that order and goes out as a ray of outgoing light Lo parallel to the ray of outgoing light Lo