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:
Jun. 09, 2015
Filed:
May. 13, 2013
Panasonic Corporation, Osaka, JP;
Abstract
The controller changes an applied time (ON-time) of a DC voltage while keeping an intermittent period in which the DC voltage is supplied intermittently constant, when adjusting an average value of currents to a predetermined reference value or more, and changes a stopped time (OFF-time) of the DC voltage together with the intermittent period while keeping the applied time constant, when adjusting the average value to a value less than the predetermined reference value. Therefore, the lighting device can reduce variation in emission color compared with the conventional lighting device adopting DC Dimming Method, and can reduce variation in amount of light compared with the case where ON-time is changed until the dimming level reaches a lower limit. As a result, the lighting device can modulate light even at a low dimming level while reducing variation in emission color and variation in amount of light.