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. 28, 2006
Filed:
Sep. 25, 2001
Tomoyoshi Yamashita, Kanagawa, JP;
Yasuko Hayashi, Kanagawa, JP;
Tomoyoshi Yamashita, Kanagawa, JP;
Yasuko Hayashi, Kanagawa, JP;
Mitsubishi Rayon Co., Ltd., Tokyo, JP;
Abstract
The index of refraction of a light guide () for transmitting light outputted from a primary light source () is ng, and the light guide () has a light input end face (), a light output surface from which the transmitted light is outputted, and a back surface opposed to the light output surface. A leaky ray modulator () is provided to at least either the light output surface or the back surface. The leaky ray modulator () has a composite layer () provided on the light output surface or the back surface and composed of first refractive index regions () having a refractive index n(ng>n) and second refractive index regions () having a refractive index n(n>n) and a third refractive index layer () provided on the composite layer () and having a refractive index n(n>n). A reflecting plate () is provided adjacent to the back surface of the light guide ().