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:
Nov. 02, 1976
Filed:
Jan. 28, 1975
Koichi Uchino, Katsuta, JA;
Hideaki Koizumi, Katsuta, JA;
Hitachi, Ltd., , JA;
Abstract
An ampoule shaped electrodeless discharge tube, including a large-diameter portion and a small-diameter portion, is filled with luminous elements and inactive gas. The discharge tube is placed in a housing having a lighting window from which the light emitted by the elements is extracted. A high-frequency coil is wound around the large diameter portion at the middle portion of the discharge tube. A partition wall provided in the housing partitions the housing into a first and a second compartments. The middle portion of the discharge tube and the small diameter portion are placed in the first compartment, while the end portion of the discharge tube opposite to the small-diameter portion is placed in the second compartment, and is cooled with air-flow flowing from the inlet to the outlet, both of which are formed to the housing. When high-frequency power is supplied to the coil, the luminous elements in the discharge tube is excited to luminesce. The light thus emitted is extracted to the exterior, through the lighting window. Unvaporized elements are localized at the portion to be cooled by the air-flow.