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:
Apr. 19, 2011
Filed:
Mar. 09, 2009
Chin-tin Hsiao, Jhongli, TW;
Jyh-lih Wang, Jhongli, TW;
Hui-hsin Kao, Jhongli, TW;
Trend Lighting Corp., Jhongli, Taoyuan Hsien, TW;
Abstract
A method for controlling the brightness and increasing uniformity of light generated by Lambertian surface sources has the steps of providing multiple pairs of Lambertian surface sources to produce light emitting on a target surface, each pair of Lambertian surface sources consisting of two Lambertian surface sources; rotating the two Lambertian surface sources of the same pair by a same rotation angle relative to the target surface but in opposite directions; calculating a maximum illumination and a minimum illumination corresponding to the rotation angle; determining whether a ratio of the maximum illumination to the minimum illumination is lower than a threshold; and fixing the Lambertian surface sources at the rotation angle if the ratio is lower than the threshold.