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. 27, 2001
Filed:
Jun. 16, 1999
Osamu Takahashi, Kanagawa, JP;
Kazuhiko Tsugita, Kanagawa, JP;
Isamu Ogawa, Kanagawa, JP;
Tetuya Kobayashi, Kanagawa, JP;
Isao Masatika, Kanagawa, JP;
Tadashi Maeda, Kanagawa, JP;
Koji Shibata, Kanagawa, JP;
Kenji Hamazaki, Kanagawa, JP;
Hiroaki Nishikawa, Kanagawa, JP;
Other;
Abstract
A discharge lamp lighting device in which dim control can be performed for a discharge lamp continuously and stably in a wide range, and which is simple in circuit configuration and low in price. The discharge lamp lighting device comprises: an inverter (IV) for turning on/off switching elements (Q,, Q,) by an oscillation output signal of an IV control integrated circuit (IC,) to thereby invert a voltage of a DC power supply (E) into high-frequency electric power, a discharge lamp (LA) capable of being lighted by the high-frequency electric power from the inverter (IV), a feedback circuit (FB) having delay time T (unit: second) expressed by 1/f≦T≦1/10,000 when the frequency of the high-frequency electric power is f, the feedback circuit (FB) including a reference value setting means (R,) for setting a reference value, the feedback circuit outputting a voltage for controlling the IV control integrated circuit (IC,) to make the high-frequency electric power equal to the reference value.