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. 10, 1999
Filed:
Jan. 14, 1998
Masayasu Yamashita, Shizuoka, JP;
Atsushi Toda, Shizuoka, JP;
Koito Manufacturing Co., Ltd., Tokyo, JP;
Abstract
A discharge lamp lighting circuit which, when a discharge lamp is removed from a connecting member such as a socket or the like and the discharge lamp is judged unlighted, stops the power supply to the discharge lamp to thereby prevent ill effects caused by the wrong detection of connecting condition detect means used to detect a connecting condition between the discharge lamp and connecting member. The discharge lamp lighting circuit comprises lighting control which supplies an electric power to a discharge lamp through a given connecting member (such as a socket or the like) and controls the lighting of the discharge lamp, a lighting condition detector which is used to detect the lighted or unlighted condition of the discharge lamp, a connecting condition detector which detects whether the discharge lamp is connected to the connecting member or not, and a power supply control which controls the supply of power to the discharge lamp. When the power supply control receives from the connecting condition detector a signal indicating that the discharge lamp is removed from the connecting member and also receives from the lighting condition detector a signal indicating that the discharge lamp is in the unlighted condition, the power supply to the discharge lamp is stopped.