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EP0424148A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Image tube device

Assignee: Hamamatsu Photonics KK
•
Filing: 1990-10-18
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Granted: —
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Expires: 2010-10-18
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Abstract

Abstract Electrons emitted from a photocathode (2) in response to incident X-rays are accelerated and focused onto a microchannel plate (MCP) (4). The electrons multiplied by the MCP (4) are converted into a visible light image by a phosphor screen (3). An envelope tube (1) is curved in the middle, and the electrons are deflected by a deflection coil (7) to travel along the curved envelope tube (1) and enter the MCP (4). Even if X-rays are transmitted through the photocathode (2), they are prevented from entering the HCP (4) by the curvature of the tube (1) and electron path and so hardly contribute to the background noise. A limiting aperture ring (8) may further be used to prevent the X-rays being reflected by the inside wall of envelope tube (1) and entering the MCP.

Inventors

  • 👤 Katsuyuki C/O Hamamatsu Photonics K.K. Kinoshita
  • 👤 Tatsuya C/O Hamamatsu Photonics K.K. Matsumura

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 16:43
CPC Classifications
H; H01; H01J; H01J31/00; H01J31/08; H01J31/50; H01J2231/00; H01J2231/50; H01J2231/50005; H01J2231/5001; H01J2231/50031; H01J2231/50036; H01J2231/50057; H01J2231/50063; H01J2231/501; H01J2231/5013; H01J2231/5016; H01J2231/505; H01J2231/5056

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 96 words
An image tube device comprising: photoelectric conversion means (2) for converting incident electromagnetic waves into electrons; acceleration means (5) for accelerating the electrons emitted from the photoelectric conversion means (2) along a direction generally identical to an electromagnetic wave incident direction; and image output means (3) for converting the electrons introduced by the deflection means into an output image; characterized by deflection means (7) for deflecting the accelerated electrons so as to introduce the electrons to an area which is out of reach of electromagnetic waves transmitted from the photoelectric conversion means (2) and travelling straight.
Claim 2
Dependent Claim 96 words
An image tube device comprising: photoelectric conversion means (2) for converting incident electromagnetic waves into electrons; acceleration means (5) for accelerating the electrons emitted from the photoelectric conversion means (2) along a direction generally identical to an electromagnetic wave incident direction; and image output means (3) for converting the electrons introduced by the deflection means into an output image; characterized by deflection means (7) for deflecting the accelerated electrons so as to introduce the electrons to an area which is out of reach of electromagnetic waves transmitted from the photoelectric conversion means (2) and travelling straight.
Claim 3
Dependent Claim 25 words
An image tube device according to claim 1, further comprising means (8) for preventing the transmitted electromagnetic waves from entering the image output means (3).
Claim 4
Dependent Claim 46 words
An image tube device according to claim 2, wherein the preventing means comprises a limiting aperture ring (8) for shielding the electromagnetic waves transmitted from the photoelectric conversion means (2) and reflected by an inside wall of an envelope tube (1) of the image tube device.
Claim 5
Dependent Claim 34 words
An image tube device according to claim 2, wherein the preventing means comprises a straight tube (9) connected to an envelope tube (1) of the image tube device, for receiving the transmitted electromagnetic waves.
Claim 6
Dependent Claim 35 words
An image tube device according to and one of the preceding claims, further comprising an envelope tube (1) which is curved along its length so as to conform to a travelling path of the electrons.
Claim 7
Dependent Claim 32 words
An image tube device according to any one of the preceding claims, further comprising means (6) for focusing the electrons emitted from the photoelectric conversion means (2) onto the image output means.

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