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. 12, 2009
Filed:
Feb. 23, 2007
Takashi Shimura, Fujiyoshida, JP;
Takashi Shimura, Fujiyoshida, JP;
Citizen Electronics Co., Ltd., Yamanashi-ken, JP;
Abstract
A backlight unit includes a planar light source member that has a light-emitting surface and that emits light having directivity in a perpendicular direction to the light-emitting surface. An optical member has a light-receiving surface opposed to the light-emitting surface of the planar light source member and a light-emitting surface opposite to the light-receiving surface. The light-receiving surface has a multiplicity of prisms. By the prism action, the optical member emits the light having directivity in the perpendicular direction from the planar light source member as light having directivity in at least two directions on opposite sides of the perpendicular direction. The directions of light directivity are changed by varying the apex angle of the prisms.