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:
Feb. 10, 2015
Filed:
Jul. 10, 2012
Applicants:
Atsushi Imamura, Hyogo, JP;
Takanori Samejima, Hyogo, JP;
Minoru Fukuda, Hyogo, JP;
Inventors:
Assignee:
Ushio Denki Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H05B 37/02 (2006.01); H05B 41/24 (2006.01); H05B 41/288 (2006.01); H05B 41/292 (2006.01);
U.S. Cl.
CPC ...
H05B 41/24 (2013.01); H05B 41/2887 (2013.01); H05B 41/2928 (2013.01); Y02B 20/208 (2013.01); Y02B 20/202 (2013.01);
Abstract
In a lighting apparatus containing a high pressure discharge lamp, an alternating current supplied to the discharge lamp at the time of steady lighting of the frequency (basic frequency) selected from a range between 60 and 1000 Hz and a low frequency having a frequency selected from a range between 5 and 200 Hz lower than the basic frequency is generated alternately. The frequency of the low frequency wave is changed in response to the change of the lighting voltage of the discharge lamp. The supply period of the basic frequency is increased and decreased little by little by every predetermined time.