(19)
(11) EP 0 658 919 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
23.08.1995 Bulletin 1995/34

(43) Date of publication A2:
21.06.1995 Bulletin 1995/25

(21) Application number: 94309210.6

(22) Date of filing: 09.12.1994
(51) International Patent Classification (IPC)6: H01J 43/04, H01J 43/28
(84) Designated Contracting States:
DE FR GB

(30) Priority: 09.12.1993 JP 309371/93

(71) Applicant: HAMAMATSU PHOTONICS K.K.
Shizuoka-ken (JP)

(72) Inventors:
  • Nakamura, Kimitsugu
    Hamamatsu-shi, Shizuoka-ken (JP)
  • Hanai, Hiroyuki
    Hamamatsu-shi, Shizuoka-ken (JP)
  • Hashimoto, Takeo
    Hamamatsu-shi, Shizuoka-ken (JP)
  • Suzuki, Shinji
    Hamamatsu-shi, Shizuoka-ken (JP)
  • Watase, Yasushi
    Hamamatsu-shi, Shizuoka-ken (JP)
  • Tachino, Masumi
    Hamamatsu-shi, Shizuoka-ken (JP)

(74) Representative: Whitten, George Alan et al
R.G.C. Jenkins & Co., 26 Caxton Street
London SW1H 0RJ
London SW1H 0RJ (GB)


(56) References cited: : 
   
       


    (54) Photomultiplier


    (57) There is provided a photomultiplier in which a transmittance of an incident light and a photosensitivity is high and a hysteresis characteristic is excellent. Therefore, in the present invention, a photocathode 16, dynodes 17a to 17c and an anode 18 are supported between insulating material substrates 12a and 12b provided in a glass bulb 11. A transparent conductive film 19 is formed on an inside wall surface of a light entrance portion 15. The transparent conductive film 19 electrically contacts with a pad 20 which is led through a terminal 14 to the outside. The same potential as the photocathode 12 is applied through the pad 20 to the transparent conductive film 19. The incident light directly impinges on the photocathode 16 through the glass bulb 11 and the transparent conductive film 19 at a place corresponding to the light entrance portion 15. As a result, the incident light reaches the photocathode 12 with not being interfered at all, and the transmittance of the incident light is improved. Since a predetermined potential is applied to the transparent conductive film 19, the change of the potential of the inside wall surface of the glass bulb 11 is performed at high speed, and the hysteresis becomes extremely small.






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