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. 18, 2008
Filed:
Mar. 25, 2004
Yuki Katsura, Shinjuku-Ku, JP;
Yuki Katsura, Shinjuku-Ku, JP;
Dai Nippon Printing Co., Ltd., Tokyo, JP;
Abstract
In a diffusion sheet, a plurality of approximately trapezoidal columnar unit lens portionsare disposed such that the long-axis directions thereof are in parallel with each other, and all the surfaces of the unit lens portions, which correspond to the long bottom segmentsof the approximately trapezoidal sections of the unit lens portionsare disposed on a light-incident-side flat surface. Further, light absorbing portionsare disposed in the grooves between adjacent unit lens portionsto absorb and/or shield external light incident from a light outgoing side. In the diffusion sheetarranged as described above, light incident on the unit lens portionsfrom a light incident side is totally reflected on the surfaces corresponding to the side segmentsof the approximately trapezoidal sections vertical to the long-axis direction of the unit lens portions and outgoes from the light outgoing side. In each of the unit lens portionsarranged as described above, the distance h between both the bottom segmentsandof the approximately trapezoidal section is 120% or more to 400% or less of the length p of the long bottom segment(h/p=1.20 to 4.00).