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:
Oct. 14, 2008
Filed:
Feb. 25, 2005
Tetsu Ohishi, Hiratsuka, JP;
Hiroki Yoshikawa, Hiratsuka, JP;
Koji Hirata, Yokohama, JP;
Daisuke Imafuku, Fujisawa, JP;
Tetsu Ohishi, Hiratsuka, JP;
Hiroki Yoshikawa, Hiratsuka, JP;
Koji Hirata, Yokohama, JP;
Daisuke Imafuku, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Images that are bright even on the periphery of a transmissive screen are obtained by reducing reflection loss of the screen when the screen incident angle of the image light entering the upper left and right ends of the screen increases. Incident-side prisms (), each having at least a plane-of-incidence (c) onto which light comes in, an exit face (d) from which the light that has come in from the plane-of-incidence exits after being refracted, and a refractive face (e) on which the light that has exited from the exit face is refracted and then guided to the image-viewing side of the Fresnel lens sheet (), are provided in the range where the incident angle of the incoming light becomes equal to or greater than approximately 40 degrees.