公开(公告)号：DE69329427T2

公开(公告)日：2001-03-01

申请号：DE69329427

申请日：1993-05-24

Applicant: HAMAMATSU PHOTONICS KK

Inventor： NAKAMURA KIMITSUGU ,  HASHIMOTO TAKEO ,  WASHIYAMA HIROAKI ,  KUROYANAGI TOMIHIKO

IPC: H01J43/06 ,  H01J43/20

Abstract: An electron lens electrode (5) for guiding photoelectrons emitted from a photocathode (2) to an electron multiplier section is arranged between the photocathode and the light-incident portion of a sealed container, and an opening (15a) is formed at a portion of the electron lens electrode opposing the light-incident portion. Incident light reaches the photocathode through the opening without being scattered or absorbed at all. The transmittance of light incident on a photomultiplier is improved, and the output waveform is uniformed, resulting in an improved S/N ratio.

公开(公告)号：DE69324325T2

公开(公告)日：1999-09-30

申请号：DE69324325

申请日：1993-10-05

Applicant: HAMAMATSU PHOTONICS KK

Inventor： WATASE YASUSHI ,  KINOSHITA MASAO ,  WATANABE HIROYUKI ,  HASHIMOTO TAKEO ,  IIDA TAKEHIRO ,  WASHIYAMA HIROAKI

IPC: H01J1/34 ,  H01J1/35 ,  H01J40/06 ,  H01J1/32

Abstract: A cathode for photoelectric emission or a cathode for secondary electron emission comprises a thin film made of a material which emits photoelectrons (4) by an incident light (3) or emits secondary electrons by an electron input on a base substrate and of which an average particle size is 200 nm to 2000 nm. It is preferred that the average particle size is nearly equal to an average diffusion length of the particle of excited electron. Further, the average particle size is preferably larger than the mean value of penetration lengths of inputted electrons or incident lights in the particles. Moreover, preferably convexities and/or concavities formed of particles each having the average particle size are formed on all over the surface of a plane of input for the light or electron. Further, it is preferred that the thin film is activated by an alkali metal and is made of compounds of at least one kind of an alkali metals and an antimony metal. Moreover, it is preferred that a layer having high reflectance against lights is inserted between the base substrate and the thin film. Thus, according to the cathode for photoelectric emission or the cathode for secondary electron emission, photoelectrons or secondary electrons are generated effectively and emitted from the cathode for photoelectric emission or the cathode for secondary electron emission.

公开(公告)号：DE69406764D1

公开(公告)日：1997-12-18

申请号：DE69406764

申请日：1994-12-09

Applicant: HAMAMATSU PHOTONICS KK

Inventor： NAKAMURA KIMITSUGU ,  HANAI HIROYUKI ,  HASHIMOTO TAKEO ,  SUZUKI SHINJI ,  WATASE YASUSHI ,  TACHINO MASUMI

IPC: H01J43/20 ,  H01J43/04 ,  H01J43/06 ,  H01J43/28

公开(公告)号：DE69305571T2

公开(公告)日：1997-03-06

申请号：DE69305571

申请日：1993-05-24

Applicant: HAMAMATSU PHOTONICS KK

Inventor： NAKAMURA KIMITSUGU ,  HASHIMOTO TAKEO ,  WASHIYAMA HIROAKI ,  KUROYANAGI TOMIHIKO

IPC: H01J43/06 ,  H01J43/20

Abstract: An electron lens electrode (5) for guiding photoelectrons emitted from a photocathode (2) to an electron multiplier section is arranged between the photocathode and the light-incident portion of a sealed container, and an opening (15a) is formed at a portion of the electron lens electrode opposing the light-incident portion. Incident light reaches the photocathode through the opening without being scattered or absorbed at all. The transmittance of light incident on a photomultiplier is improved, and the output waveform is uniformed, resulting in an improved S/N ratio.

公开(公告)号：DE69324325D1

公开(公告)日：1999-05-12

申请号：DE69324325

申请日：1993-10-05

Applicant: HAMAMATSU PHOTONICS KK

Inventor： WATASE YASUSHI ,  KINOSHITA MASAO ,  WATANABE HIROYUKI ,  HASHIMOTO TAKEO ,  IIDA TAKEHIRO ,  WASHIYAMA HIROAKI

IPC: H01J1/34 ,  H01J1/35 ,  H01J40/06 ,  H01J1/32

Abstract: A cathode for photoelectric emission or a cathode for secondary electron emission comprises a thin film made of a material which emits photoelectrons (4) by an incident light (3) or emits secondary electrons by an electron input on a base substrate and of which an average particle size is 200 nm to 2000 nm. It is preferred that the average particle size is nearly equal to an average diffusion length of the particle of excited electron. Further, the average particle size is preferably larger than the mean value of penetration lengths of inputted electrons or incident lights in the particles. Moreover, preferably convexities and/or concavities formed of particles each having the average particle size are formed on all over the surface of a plane of input for the light or electron. Further, it is preferred that the thin film is activated by an alkali metal and is made of compounds of at least one kind of an alkali metals and an antimony metal. Moreover, it is preferred that a layer having high reflectance against lights is inserted between the base substrate and the thin film. Thus, according to the cathode for photoelectric emission or the cathode for secondary electron emission, photoelectrons or secondary electrons are generated effectively and emitted from the cathode for photoelectric emission or the cathode for secondary electron emission.

公开(公告)号：DE69329427D1

公开(公告)日：2000-10-19

申请号：DE69329427

申请日：1993-05-24

Applicant: HAMAMATSU PHOTONICS KK

Inventor： NAKAMURA KIMITSUGU ,  HASHIMOTO TAKEO ,  WASHIYAMA HIROAKI ,  KUROYANAGI TOMIHIKO

IPC: H01J43/06 ,  H01J43/20

Abstract: An electron lens electrode (5) for guiding photoelectrons emitted from a photocathode (2) to an electron multiplier section is arranged between the photocathode and the light-incident portion of a sealed container, and an opening (15a) is formed at a portion of the electron lens electrode opposing the light-incident portion. Incident light reaches the photocathode through the opening without being scattered or absorbed at all. The transmittance of light incident on a photomultiplier is improved, and the output waveform is uniformed, resulting in an improved S/N ratio.

公开(公告)号：DE69406764T2

公开(公告)日：1998-04-02

申请号：DE69406764

申请日：1994-12-09

Applicant: HAMAMATSU PHOTONICS KK

Inventor： NAKAMURA KIMITSUGU ,  HANAI HIROYUKI ,  HASHIMOTO TAKEO ,  SUZUKI SHINJI ,  WATASE YASUSHI ,  TACHINO MASUMI

IPC: H01J43/20 ,  H01J43/04 ,  H01J43/06 ,  H01J43/28

公开(公告)号：DE69305571D1

公开(公告)日：1996-11-28

申请号：DE69305571

申请日：1993-05-24

Applicant: HAMAMATSU PHOTONICS KK

Inventor： NAKAMURA KIMITSUGU ,  HASHIMOTO TAKEO ,  WASHIYAMA HIROAKI ,  KUROYANAGI TOMIHIKO

IPC: H01J43/06 ,  H01J43/20

Abstract: An electron lens electrode (5) for guiding photoelectrons emitted from a photocathode (2) to an electron multiplier section is arranged between the photocathode and the light-incident portion of a sealed container, and an opening (15a) is formed at a portion of the electron lens electrode opposing the light-incident portion. Incident light reaches the photocathode through the opening without being scattered or absorbed at all. The transmittance of light incident on a photomultiplier is improved, and the output waveform is uniformed, resulting in an improved S/N ratio.