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. 13, 2015
Filed:
Feb. 01, 2008
Masahiro Goto, Mihara, JP;
Daijiro Kodama, Mihara, JP;
Junichi Sawanobori, Minami Alps, JP;
Akiko Goto, Kuki, JP;
Hiroshi Yamamoto, Kawaguchi, JP;
Wataru Tokuhara, Okazaki, JP;
Masahiro Goto, Mihara, JP;
Daijiro Kodama, Mihara, JP;
Junichi Sawanobori, Minami Alps, JP;
Akiko Goto, Kuki, JP;
Hiroshi Yamamoto, Kawaguchi, JP;
Wataru Tokuhara, Okazaki, JP;
Dai Nippon Printing Co., Ltd., Shinjuku-Ku, JP;
Abstract
An optical sheet is incorporated in a direct type surface light source device including a light source and is configured to allow light emitted from the light source to exit after changing a travel direction of the light. The optical sheet has a light exiting side lens part including unit lenses juxtaposed to one another and each unit lens is convex toward a light exiting side. A light scattering layer, configured to scatter the light, is provided to each unit lens. The light scattering layer extends along a light exiting side surface of each convex unit lens and constitutes the light exiting side surface of the unit lens. A thickness of the light scattering layer around an apex portion of each unit lens is greater than the thickness of the light scattering layer around each end portion of the unit lens.