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Electron tube

A technology of electron tubes and electrons, applied in the field of electron tubes, can solve problems such as the reduction of the output of photomultiplier tubes and the deterioration of the sensitivity of the photoelectric surface

Inactive Publication Date: 2005-04-27
HAMAMATSU PHOTONICS KK
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] However, in conventional photomultiplier tubes, the sensitivity of the photoelectric surface deteriorates with prolonged use, resulting in a problem that the output of the photomultiplier tube to incident light decreases.

Method used

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  • Electron tube
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Embodiment Construction

[0023] Next, preferred embodiments of the photomultiplier tube of the present invention will be described together with the drawings. In the description of the drawings, the same reference numerals are attached to the same elements, and overlapping descriptions are omitted. In addition, the dimensional ratios of the drawings do not necessarily match the components described.

[0024] figure 2 It is a cross-sectional view of a photomultiplier tube according to an embodiment of the present invention. The photomultiplier tube is formed by disposing the electron multiplier 24 composed of multistage dynode electrodes 24a to 24n inside the vacuum container 10. The vacuum container 10 is formed by the following parts: a circular light-receiving panel 11 that receives incident light; A cylindrical metal side pipe 12 and a circular stem 13 constituting a base portion are formed on the outer peripheral portion of the light receiving panel 11 .

[0025] A semiconductor photoelectric s...

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Abstract

To prevent the deterioration in sensitivity of the photoelectric surface (20) of an electron tube and maintain stable output for a long time, an ion confinement electrode (22) and an ion trap electrode (23) are provided between the photoelectric surface (20) and a dynode (24a) of a first stage. The potential of the ion confinement electrode (22) is set higher than that of the dynode (24a) of the first stage, while the potential of the ion trap electrode (23) is set equal to or higher than that of the photoelectric surface (20) and lower than that of the dynode (24a) of the first stage. Since the feedback to the photoelectric surface (20) of the positive ions generated in the vicinity of the dynode (24a) of the first stage can be effectively suppressed, the sensitivity of the photoelectric surface (20) is prevented from decreasing, and stable output is maintained for a long time.

Description

technical field [0001] The present invention relates to an electron tube including a photocathode that photoelectrically converts incident light to emit electrons, and an electron multiplication unit that multiplies incident electron flow by secondary electron emission. Background technique [0002] Photomultiplier tubes, a type of electron tube, are widely used in various measurements in the fields of nuclear and high-energy physics and nuclear medicine. [0003] 1( a ) and FIG. 1( b ) show an example of a conventional photomultiplier tube, FIG. 1( a ) is a plan view, and FIG. 1( b ) is a cross-sectional view. The photomultiplier tube shown here is composed of the following components: a circular light-receiving panel 11 that receives incident light; a photoelectric surface 20 that is formed inside the light-receiving panel 11 and whose potential is kept at 0 volts; Electron multiplying unit 24 constituted by (dynode) 24a to 24n. A plurality of dynodes from the first-stag...

Claims

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Application Information

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IPC IPC(8): H01J43/06H01J43/30
CPCH01J43/06
Inventor 下井英树久嶋浩之长谷川宽永井俊光
Owner HAMAMATSU PHOTONICS KK
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