公开(公告)号：JPH05325877A

公开(公告)日：1993-12-10

申请号：JP13678192

申请日：1992-05-28

Applicant: HAMAMATSU PHOTONICS KK

Inventor： NAKAMURA KOJI ,  HASHIMOTO NAGAO ,  WASHIYAMA HIROAKI ,  KUROYANAGI TOMIHIKO

IPC: H01J43/06 ,  H01J43/20

Abstract: PURPOSE:To enhance the transmittance of light incident on a photomultiplier tube, make output waveforms uniform and enhance S/N ratio. CONSTITUTION:An electron lens electrode 11 for guiding toward a photomultiplying portion 3 photoelectrons released from a photoelectric cathode 2 is disposed between the photoelectric cathode 2 and the light incident portion 5 of a sealed container 1, and an opening 11a is provided in the portion of the electron lens electrode 11 opposite to the light incident portion 5. The opening 11a permits incoming light to reach the photoelectric cathode 2 without undergoing scattering or absorption, etc., at all.

公开(公告)号：JPH07161334A

公开(公告)日：1995-06-23

申请号：JP30937193

申请日：1993-12-09

Applicant: HAMAMATSU PHOTONICS KK

Inventor： NAKAMURA KOJI ,  HANAI HIROYUKI ,  HASHIMOTO NAGAO ,  SUZUKI SHINJI ,  WATASE YASUSHI ,  TATENO MASUMI

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

Abstract: PURPOSE:To provide a photomultiplier, in which the light transmittance of incident light and photoelectric sensitivity are high, and the hysteresis characteristic is excellent. CONSTITUTION:Insulator base boards 12a, 12b are provided on the inside of a glass bulb 11, and a photoelectric negative electrode 16, dinodes 17a-17c for multiplying emitted photoelectrons in order, and a positive electrode 18 for collecting output signals, are supported between the insulator base boards 12a and 12b. A transparent conductive film 19 is formed on the inner wall surface of a light incident part 15. The transparent conductive film 19 is in electrical contact with a pad 20 adhered to the inner wall surface of the light incident part 15, and the pad 20 is guided to the outside through a terminal 14. The same electric potential as that of the photoelectric negative electrode 16 is given to the transparent conductive film 19. The incident light directly enters the photoelectric negative electrode 16 through the glass bulb 11 of the light incident part 15 and the transparent conductive film 19.

公开(公告)号：JP2003223863A

公开(公告)日：2003-08-08

申请号：JP2003046485

申请日：2003-02-24

Applicant: HAMAMATSU PHOTONICS KK

Inventor： NAKAMURA KOJI ,  HASHIMOTO NAGAO ,  WASHIYAMA HIROAKI ,  KUROYANAGI TOMIHIKO

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

Abstract: PROBLEM TO BE SOLVED: To improve the transmittance of light incident on a photomultiplier, and to uniform the output waveform, thereby improving the S/N ratio. SOLUTION: In a side-on type photomultiplier, a flat plate electron lens electrode 11 for guiding photoelectrons emitted from a photocathode 2 to an electron multiplier section 3 is arranged between the photocathode 2 and a light-incident portion 5 of a hermetic container 1, and an opening 11a is provided at a portion of this electron lens electrode facing the light-incident portion 5. By this opening 11a, incident light reaches the photocathode 2 without being scattered or absorbed at all. COPYRIGHT: (C)2003,JPO

公开(公告)号：JPH06119872A

公开(公告)日：1994-04-28

申请号：JP26623592

申请日：1992-10-05

Applicant: HAMAMATSU PHOTONICS KK

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

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

Abstract: PURPOSE:To provide a cathode for emitting a photoelectron or a secondary electron, incorporating improved quantum efficiency. CONSTITUTION:Many grains 5c composed of a compound of cesium metal, sodium metal, potassium metal and antimony metal, are made to grow for deposition on a nickel electrode plate 5b covered with an aluminum metal layer 5a. The mean grain size of the grains 5c is 500nm. Also, the height of the grains 5c at both projected and recessed sections is approximately 1,000nm, while a gap between the grains 5c at the projected section and other grains 5c at the recessed section is 1,000nm. In this case, polarizing characteristics for light incident on photoelectric surface are effectively eliminated, and incident light or primary electrons are almost absorbed by the grains 5c forming the first and second layers on the surface. According to this construction, electrons excited and generated from the grains 5c can emit photoelectrons or secondary electrons.