Claims
- 1. A photomultiplier comprising:
- a transparent closed container including a light entrance portion;
- a reflection type photocathode, provided in said closed container, for emitting photoelectrons in response to an incident light transmitted through said light entrance portion;
- a transparent conductive film formed on an inside wall surface of said light entrance portion of said closed container, a predetermined potential being applied to said film;
- an electron multiplying unit, including plural stages of dynodes, for electron-multiplying said photoelectrons emitted from said reflection type photocathode; and
- an anode for collecting said multiplied electrons.
- 2. A photomultiplier according to claim 1, wherein said transparent conductive film is formed in a manner that chromium is evaporated onto said inside wall surface of said closed container.
- 3. A photomultiplier according to claim 1, further comprising:
- a pad adhered to said inside wall surface of said closed container so as to electrically contact with said transparent conductive film; and
- a terminal electrically contacting with said pad, a part of said terminal being exposed to an outside of said closed container;
- wherein said predetermined potential is applied through said pad and said terminal to said transparent conductive film.
- 4. A photomultiplier according to claim 1, wherein the same negative-polarity potential is applied to said photocathode and said transparent conductive film, a ground potential is applied to said anode, and an appropriate potential which divides a voltage between said negative-polarity potential and said ground potential is applied to each of said dynodes, respectively.
- 5. A photomultiplier according to claim 1, further comprising a shield plate provided at the rear of said photocathode, wherein an end of a light entrance side of said photocathode is fixed to an end of a light entrance side of said shield plate.
- 6. A photomultiplier according to claim 1, further comprising:
- a pair of insulating material substrates for supporting said photocathode, said electron multiplying unit and said anode; and
- a plate spring having a shape extending along a direction of a circumference of said insulating material substrate, a part of said plate spring being fixed to an end of a supporting rod of said dynode constituting said electron multiplying unit, a part of said plate spring contacting with said inside wall of said closed container;
- wherein said supporting rod and said insulating material substrate fixed to the supporting rod are supported by and fixed to said inside wall of said closed container, due to an elastic force of said plate spring toward an outside of said closed container in a direction of a radius of said insulating material substrate.
- 7. A photomultiplier according to claim 6, wherein said transparent conductive film is formed on a side wall of an inside of said closed wall at a area in which said transparent conductive film does not electrically contact with said plate spring, said area including said place corresponding to said light entrance portion.
- 8. A photomultiplier according to claim 1, further comprising:
- a pair of insulating material substrates for supporting said photocathode, said electron multiplying unit and said anode; and
- a spring plate of which two ends are engaged with said insulating material substrates, respectively, a middle portion of said spring plate contacting with said inside wall of said closed container;
- wherein said insulating material substrates are supported by and fixed to said inside wall of said closed container, due to an elastic force of said spring plate toward an outside of said closed container from a longitudinal center axis of said closed container.
- 9. A photomultiplier according to claim 8, wherein said transparent conductive film is formed on the whole of said inside wall surface of said closed container.
- 10. A photomultiplier, comprising:
- a transparent closed container including a light entrance portion;
- a reflection type photocathode, provided in said closed container, for emitting photoelectrons in response to an incident light transmitted through said light entrance portion;
- an electron multiplying unit, including plural stages of dynodes, for electron-multiplying said photoelectrons emitted from said reflection type photocathode;
- an anode for collecting said multiplied electrons; and
- a pair of insulating material substrates for supporting said photocathode, said electron multiplying unit and said anode;
- wherein one supporting rod of a pair of supporting rods for supporting said dynodes of said electron multiplying unit has first and second portions which are separated from each other, and portions of one of said dynodes are at least partially wound around said first and second portions of said one supporting rod.
- 11. A photomultiplier according to claim 10, wherein said one of said dynodes is at least the dynode of a first stage into which said photoelectrons emitted from said photocathode enters directly.
Priority Claims (1)
Number |
Date |
Country |
Kind |
5-309371 |
Dec 1993 |
JPX |
|
Parent Case Info
This application is a continuation of U.S. patent application Ser. No. 08/068,220, filed May 29, 1993, now U.S. Patent No. 5,420,476.
US Referenced Citations (4)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0573194 |
Dec 1993 |
EPX |
5214585 |
Apr 1977 |
JPX |
5318864 |
Jun 1978 |
JPX |
4292843 |
Oct 1992 |
JPX |
Non-Patent Literature Citations (2)
Entry |
European Search Report dated Jul. 5, 1995. |
Patent Abstracts of Japan, vol. 017, No. 104 (E-1328), 3 Mar. 1993, JP A 04 292843 (Hamamatsu Photonics KK) 16 Oct. 1992, abstract. |
Continuations (1)
|
Number |
Date |
Country |
Parent |
68220 |
May 1993 |
|