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:
Nov. 29, 2016
Filed:
Sep. 19, 2014
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
To avoid accelerated progression of deterioration of a semiconductor laser, an LED, and the like to extend their lives while adjusting a balance of a plurality of colors, such as R, G, and B, by feedback control, a deterioration controllable monochromatic light source module is configured to: calculate a substantial upper limit Iu, determine an operation coefficient hx based on a deterioration coefficient dx, perform feedback control of the output current Ix of each drive circuit, and output a light intensity detection signal to the outside. An integrating control circuit calculates a monochromatic light intensity sum σ by a sum of light intensity detection signals from the monochromatic light source modules belonging to the same wavelength band and determines a light intensity target signal so that a ratio of the monochromatic light intensity sum σ to the monochromatic light source modules in different wavelength bands is a predetermined ratio.