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:
Jul. 08, 1997
Filed:
Jul. 13, 1995
Hamamatsu Photonics K.K., Hamamatsu, JP;
Abstract
The present invention is to provide a gas discharge tube which is properly lighted to improve the reproducibility of a satisfactory light emission state. The gas discharge tube includes an envelop for accommodating a hot cathode for emitting thermoelectrons, an anode for receiving the thermoelectrons, a focusing electrode having a focusing opening for converging paths of the thermoelectrons, and a discharge shielding member supporting the focusing electrode and the anode, the discharge shielding member further supporting a cathode box for surrounding the hot cathode while being electrically insulated from the focusing electrode. Since a lighting device for the gas discharge tube sets the focusing electrode to a zero or negative potential while an electric field is generated between the hot cathode and the anode, the lighting device will be certainly turned on.