公开(公告)号：JPH0817388A

公开(公告)日：1996-01-19

申请号：JP14819694

申请日：1994-06-29

Applicant: HAMAMATSU PHOTONICS KK

Inventor： NAKAMURA KOJI ,  SAWARA MASAYOSHI ,  ISHIKAWA ATSUSHI ,  OKUYAMA CHIYOJI ,  TAKEUCHI JUNICHI

IPC: H01J43/20 ,  H01J1/90 ,  H01J9/18 ,  H01J29/02 ,  H01J43/06

Abstract: PURPOSE:To provide an electron tube excellent in the S/N ratio. CONSTITUTION:Black spacers 17 made of ceramics are interposed between supporting electrodes 16 by which a number of dynode 14a are supported individually. The black spacers 17 are formed with the elemental composition of the ceramics such that its MnO content is reduced to 3wt.% or less. Therefore, leakage current that could cause dark current, and abnormal emission during electron multiplication can be reduced, resulting in the enhancement of the S/N ratio of the electron tube.

公开(公告)号：JP2000019255A

公开(公告)日：2000-01-21

申请号：JP18271298

申请日：1998-06-29

Applicant: HAMAMATSU PHOTONICS KK

Inventor： FUJITA YOSHIO ,  SAWARA MASAYOSHI ,  WADA KAZUAKI ,  KOSUGI SHOICHI ,  YOSHIZAWA YUJI

IPC: G01T1/20

Abstract: PROBLEM TO BE SOLVED: To provide a compact and sensitive radiation detector. SOLUTION: The radiation detector 10 is provided with a scintillator 12 for emitting light according to the incidence of radiation, and a photomultiplier 14 for detecting light being emitted from the scintillator 12. The photomultiplier 14 is provided with a main photoelectric surface 18, a side photoelectric surface 20, a focusing electrode 22, and an electron multiplication part 24 in a glass tube 16. The main photoelectric surface 18 is formed on the entire surface of the inner wall of a light incidence surface 16a out of two end faces for constituting the glass tube 16. Also, the side photoelectric surface 20 is formed on the inner wall of a part being adjacent to the peripheral part of the light incidence surface 16a out of the side surface 16b of the glass tube 16. Also, a part that is outside the glass tube 16 and corresponds to the main photoelectric surface 18 and the side photoelectric surface 20 is covered with the scintillator 12.

公开(公告)号：JPH0676785A

公开(公告)日：1994-03-18

申请号：JP22864992

申请日：1992-08-27

Applicant: HAMAMATSU PHOTONICS KK

Inventor： FUJITA YOSHIO ,  ATSUMI YOSHIZUMI ,  SAWARA MASAYOSHI ,  INUZUKA MASAYUKI

IPC: H01J43/06 ,  H01J43/18 ,  H01J43/20

Abstract: PURPOSE:To provide a multi-anode type photomultiplier tube in which crosstalk between dynode lines by leak electrons can be prevented. CONSTITUTION:A photomultiplier comprises a multi-anode type photomultiplier, that is a transparent closed container 1 having plural incidental windows 2 in one end surface, plural photoelectric surfaces 3 formed on the inner side of these incidental windows 2 respectively, and plural lines of dynodes disposed at facing positions to these photoelectric surfaces 3 respectively. A shield means 10 is provided between the adjacent dynode lines 6 to shield leak electrons from the dynodes 7.