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:
May. 03, 2016
Filed:
Jul. 10, 2013
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Minoru Fukuda, Himeji, JP;
Atsushi Imamura, Himeji, JP;
USHIO DENKI KABUSHIKI KAISHA, Tokyo, JP;
Abstract
A high-voltage discharge lamp illumination device comprises a pulse generation part which generates pulse waves, and a power supply part which receives a DC voltage and converts the DC voltage into the AC current in correspondence to a frequency of the pulse waves so as to supply the AC current to the lamp. The pulse generation part repeats a cycle of outputting a first pulse wave over a first period, and thereafter outputting a second pulse wave having a lower frequency than the first pulse wave over a second period shorter than the first period. The pulse generation part returns to the cycle after outputting a third pulse wave having a frequency which is further lower than the second pulse wave in place of the second pulse wave, at a predetermined timing.