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:
Aug. 19, 2014
Filed:
Jun. 05, 2012
Toshiro Kimura, Kyoto, JP;
Hideki Soya, Shanghai, CN;
Daijiro Kato, Kyoto, JP;
Shimadzu Corporation, Kyoto-Shi, JP;
Abstract
A lamp drive device L is provided that can both light a lamp and sustain a discharge by applying a trigger voltage while a direct current voltage is supplied from a power supply circuit to the electrodes of lamp before the start of discharge. The device includes a reference amount-of-change storage unit for storing a threshold value T for the amount of change in the electrode voltage before and after start of discharge, a difference calculation unit for calculating the difference (A−B) between the voltage monitor value B after the start of discharge and the voltage monitor value A before the start of discharge, and a lighting status determination unit for determining the lighting status by comparing the difference (A−B) and the threshold value T and making the determination based on the change in voltage before and after the discharge.