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:
Sep. 21, 2010
Filed:
Aug. 08, 2008
Fumio Kokubo, Nara, JP;
Masao Yamaguchi, Saitama, JP;
Fumio Kokubo, Nara, JP;
Masao Yamaguchi, Saitama, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Enplas Corporation, Kawaguchi-shi, JP;
Abstract
A light-emitting device () is arranged such that (x) Rmonotonically decreasing as αincreases, at least in a range of α<π/3, where an intersection of a light axis Z and an emission surface of a light-emitting element () is a reference point; αis an angle between the light axis Z and a straight line that passes through the reference point and an arbitrary point on a light-incoming surface (), and Ris a distance between the reference point and the arbitrary point on the light-incoming surface (); (y) Rmonotonically increasing as αincreases, at least in a range of α<π/3, where αis an angle between the light axis Z and a straight line that passes through the reference point and an arbitrary point on a light-outgoing surface (), and Ris a distance between the reference point and the arbitrary point on the light-outgoing surface (); and (z) Ascatters light without generating uneven brightness on a liquid crystal display panel and has higher scattering ability that is obtained by decreasing a reflectance caused by the Fresnel reflection, where n is a refraction index of a material forming a light flux controlling member (), and A=ΔR/(RΔα), where ΔRis an increment of Rand Δαis an increment of α.