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. 24, 2012
Filed:
Feb. 02, 2009
Tomokazu Suzuki, Shizuoka, JP;
Tomoyuki Ichikawa, Shizuoka, JP;
Tomokazu Suzuki, Shizuoka, JP;
Tomoyuki Ichikawa, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A discharge lamp lighting circuit is capable of preventing the discharge lamp from going out unexpectedly. The discharge lamp lighting circuit includes a DC-AC inverter which receives a power source voltage, boosts and converts the power source voltage into AC and supplies AC electric power to the discharge lamp. A control circuit sends a long cycle signal when the discharge lampis started. The cycle of the long cycle signal is longer than a frequency at the time of steady lighting. The control circuit sends a steady drive signal, which is a frequency at the time of steady lighting, to the DC-AC inverter. A cycle of the long cycle signal is set according to at least one of the power source voltage, the temperature of the discharge lamp lighting circuit or the extinguishing time.