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. 13, 2007
Filed:
Oct. 21, 2004
Tomoko Mochizuki, Hamamatsu, JP;
Minoru Niigaki, Hamamatsu, JP;
Toru Hirohata, Hamamatsu, JP;
Kuniyoshi Mori, Hamamatsu, JP;
Tomoko Mochizuki, Hamamatsu, JP;
Minoru Niigaki, Hamamatsu, JP;
Toru Hirohata, Hamamatsu, JP;
Kuniyoshi Mori, Hamamatsu, JP;
Hamamatsu Photonics K.K., Shizuoka, JP;
Abstract
Provided are a photocathode plate capable of stably achieving a high sensitive property, and an electron tube using such a photocathode plate. In a photomultiplier tube, an insulating layeris formed between a semiconductor electron emission layerin a photocathode plateA, and a first electrodeelectrically connected to an electron releasing portion. This insulating layerpermits the photocathode plateA to be cleaned by heat cleaning at a high temperature, in a stage before formation of an active layeron an exposed region of the semiconductor electron emission layerin the electron releasing portion. This makes it feasible to effectively clean the exposed region of the semiconductor electron emission layerin the electron releasing portionand to stabilize the physical properties of the exposed region. In consequence, a higher sensitive property can be stably achieved in the photocathode plateA and in the photomultiplier tubeusing the photocathode plateA.