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:
Nov. 10, 2009
Filed:
Mar. 29, 2006
Osamu Iwasaki, Shizuoka, JP;
Osamu Iwasaki, Shizuoka, JP;
Fujfilm Corporation, Tokyo, JP;
Abstract
A transparent light guide member comprising a first light guide unit in the form of a transparent plate having a rectangular light emitting plane and a parallel groove formed on a rear surface located opposite from the rectangular light emitting plane and parallel to one side of the rectangular light emitting plane; and a second light guide unit, which is transparent, having a columnar external shape to be accommodated in the parallel groove and containing light-scattering particles. Let Φ be the scattering cross section of the particles, Lthe length of the light guide unitin the direction in which light propagates, Nthe particle density, and Ka compensation coefficient, then a value Φ·L·N·Kthe light guide member assumes is not smaller than 1.1 and not greater than 8.2, and the compensation coefficient Kis not smaller than 0.005 and not greater than 0.1.