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. 16, 2001
Filed:
Mar. 21, 2000
Hideki Kobayashi, Nakajho-machi, JP;
Kuraray Co., Ltd., Kurashiki, JP;
Abstract
Moire fringes are effectively solved in rear projection screens including a combination of a Fresnel lens sheet and a lenticular lens sheet both having fine lens pitches. In a rear projection screen including a Fresnel lens sheet having a lens pitch of at most 0.12 mm and a lenticular lens sheet having a lens pitch of at most 0.6 mm, the pitch, P,(mm), of the moire fringes that may be given by the Fresnel lenses and the lenticular lenses at a spatial frequency of at least 3/P,is at most 3 mm, the moire pitch, P,(mm), being given by formula (1), P,=1/|n/P,−m/P,| (wherein P,(mm) indicates the smaller one of the Fresnel lens pitch and the lenticular lens pitch, P,(mm) indicates the other one thereof, and n and m each are a natural number satisfying the formula (2), n≦15×P,/P,, and formula (3), m≦15×P,/P,).