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. 31, 2007
Filed:
Mar. 14, 2003
Applicants:
Kazuhito Shimoda, Kanagawa, JP;
Toshitaka Kawashima, Kanagawa, JP;
Inventors:
Kazuhito Shimoda, Kanagawa, JP;
Toshitaka Kawashima, Kanagawa, JP;
Assignee:
Sony Corporation, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G03B 21/60 (2006.01); G02B 1/10 (2006.01);
U.S. Cl.
CPC ...
Abstract
A projection screen and method of manufacturing provides clear images regardless of the brightness of the environment within which the projection screen is used. The projection screen includes an optical thin film comprised of a multilayer dielectric having alternating high reflectance layers for light in a particular wavelength and high transmittance for visible light except in particular wavelength ranges. The thickness of each of the dielectric multilayer is determined so that the optical thin film forms a band-pass filter.