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:
Oct. 08, 2002
Filed:
Jun. 25, 2001
Applicant:
Inventors:
Assignee:
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 7/44 ;
U.S. Cl.
CPC ...
H01J 7/44 ;
Abstract
A high pressure discharge lamp is provided with an arc tube and a starter. The starter includes a ferroelectric ceramic capacitor element with non-linear characteristics an a semiconductor switching element, connected in parallel to the arc tube. A pulse stopping thermally-actuated switch is connected in series to the ferroelectric ceramic capacitor element and is operated to OFF by heating of a heating resistor in a non-lighted state of the lamp. Without accompanying reduction of a starting function due to a temperature rise of the ferroelectric ceramic capacitor element, a safety function against a non-lighted state of the lamp is provided.