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:
Jul. 04, 2006
Filed:
Jun. 27, 2003
Masahiro Goto, Shinjuku-Ku, JP;
Hitomu Watanabe, Shinjuku-Ku, JP;
Yoshiki Yoshida, Shinjuku-Ku, JP;
Hiroshi Sekiguchi, Shinjuku-Ku, JP;
Masahiro Goto, Shinjuku-Ku, JP;
Hitomu Watanabe, Shinjuku-Ku, JP;
Yoshiki Yoshida, Shinjuku-Ku, JP;
Hiroshi Sekiguchi, Shinjuku-Ku, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
A projection screencomprises a total reflection prism lensand a lenticular lensprovided on the viewer's side of the total reflection prism lens. The total reflection prism lenshas a plurality of unit prismson its back surface (the outermost plane of incidence) on which imaging light L is incident. Each unit prismhas an apical angle λ that corresponds to the angle between the plane of incidenceand the plane of total reflection, and the apical angles λ of the unit prismsvary with the position of each unit prismon the screen plane. In particular, the unit prismshave apical angles λ varying continuously from 30° to 45° so that the apical angles λ on the side distant from the center O of the concentric circles are greater than the apical angles λ on the side close to this center O.