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:
Oct. 13, 2020
Filed:
Oct. 15, 2019
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Kensuke Nagauchi, Osaka, JP;
Abstract
A semiconductor light source control apparatus includes a semiconductor light source that emits light in accordance with a current, a detection resistor that generates a detection voltage by the current flowing in the semiconductor light source; and a power supply current control apparatus that controls the current flowing in the semiconductor light source based on the detection voltage. The semiconductor light source control apparatus pulse-width-modulates (PWM) the current flowing in the semiconductor light source for respective ones of a plurality of color intervals to adjust brightness and color tone of output light from the semiconductor light source. An amplitude of the current flowing in the semiconductor light source is controlled only in a predetermined color interval when a duty value of the PWM is maximum.