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:
Apr. 08, 1997
Filed:
Apr. 28, 1994
Hiroyuki Kyushima, Hamamatsu, JP;
Koji Nagura, Hamamatsu, JP;
Yutaka Hasegawa, Hamamatsu, JP;
Eiichiro Kawano, Hamamatsu, JP;
Tomihiko Kuroyanagi, Hamamatsu, JP;
Akira Atsumi, Hamamatsu, JP;
Masuya Mizuide, Hamamatsu, JP;
Hamamatsu Photonics K.K., Shizuoka-ken, JP;
Abstract
A photomultiplier is constituted by a photocathode and an electron multiplier having a typical structure in which a dynode unit having a plurality of dynode plates stacked in an incident direction of photoelectrons, an anode plate, and an inverting dynode plate are sequentially stacked. Through holes for injecting a metal vapor are formed in the inverting dynode plate to form secondary electron emitting layers on the surfaces of dynodes supported by the dynode plates, and the photocathode. With this structure, the secondary electron emitting layers are uniformly formed on the surfaces of the dynodes. Therefore, variations in output signals obtained from anodes can be reduced regardless of the positions of the photocathode.