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. 17, 2018
Filed:
Jul. 11, 2017
Panasonic Intellectual Property Management Co., Ltd., Osaka, JP;
Katsuyuki Doi, Osaka, JP;
Abstract
In a lighting device, a voltage detector outputs a detection voltage with a magnitude corresponding to a magnitude of a DC voltage outputted from a power supply circuit, a state determiner makes determination of whether a light source is in a turned-on state or in a turned-off state, a power controller is configured to control a DC power supplied from the power supply circuit based on a result of the determination by the state determiner, and the state determiner determines, when a value obtained by subtracting the detection voltage from a first reference voltage is equal to or larger than a first threshold value, that the light source is in the turned-off state.