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:
May. 15, 2012
Filed:
Aug. 08, 2008
Fumio Kokubo, Osaka, JP;
Fumio Kokubo, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A light-emitting device () includes: a light-emitting element (); and a light flux controlling member () for controlling light emitted from the light-emitting element (), the light flux controlling member () has (i) a light-incoming surface () which the light emitted from the light-emitting element () enters and (ii) a light-outgoing surface (), and the following equation (1) is satisfied where r is a length, from a light axis Z of the light-emitting device (), of a plane that is provided at a certain distance from the light flux controlling member () in a direction parallel to the light axis Z so as to be perpendicular to the light axis Z, φis an angle between the light emitted from the light-emitting element () and the light axis, P(φ) is a light distribution property of the light-emitting element (). This provides a light-emitting device that scatters light without generating uneven brightness on a liquid crystal display panel, reduces a reflectance caused by the Fresnel's reflection, and has an improved scattering ability.