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:
May. 16, 2006
Filed:
Aug. 20, 2002
Applicants:
Minoru Niigaki, Hamamatsu, JP;
Shoichi Uchiyama, Hamamatsu, JP;
Hirofumi Kan, Hamamatsu, JP;
Inventors:
Assignee:
Hamamatsu Photonics K.K., Shizuoka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 40/06 (2006.01);
U.S. Cl.
CPC ...
Abstract
In the polycrystal diamond thin film in accordance with the present invention, the average particle size is at least 1.5 μm and, in a Raman spectrum obtained by Raman spectroscopy, a peak intensity near a wave number of 1580 cmhas a ratio of 0.2 or less with respect to a peak intensity near a wave number of 1335 cm. The photocathode and electron tube in accordance with the present invention comprise the polycrystal diamond thin film as a light-absorbing layer.