Transmission type X-ray tube
AssigneeHamamatsu Photonics K.K.
InventorsTsutomu Inazura, Kenji Suzuki
Life of this patent
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Abstract
A transmission type X-ray tube is provided with a ceramic stem fitted with cathode pins; an output window, the lower surface of which is deposited with a target metal; a ceramic bulb provided between the ceramic stem and the output window; and a focusing electrode provided along the inner surface of the ceramic bulb and which lower end is interposed between the upper surface of the ceramic stem portion and the lower end of the ceramic bulb. With this configuration, not only can the size of the X-ray tube be reduced, but mounting of the focusing electrode can also be made easier, thereby simplifying assembly operations.
Claims15
An X-ray tube comprising:
- a ceramic bulb of a tubular configuration extending in an axial direction and having an inner peripheral surface, an outer peripheral surface, a first and, and a second end opposite the first and;
- a stem secured to the first and of said ceramic bulb;
- an output window secured to the second end of said ceramic bulb, said output window having a first surface deposited with a target metal and confronting said stem and a second surface from which X-rays are output, said ceramic bulb, said stem and said output window defining an airtight chamber having an inner space;
- a cathode disposed in the inner space of the airtight chamber;
- a focusing electrode including a tubular portion having an inner peripheral surface and an outer peripheral surface, the tubular portion being disposed in the inner space and along the inner peripheral surface of said ceramic bulb to have a space between the inner peripheral surf ace of said ceramic bulb and the outer peripheral surface of the tubular portion, said focusing electrode further including a lower end portion interposed between said stem and the first end of said ceramic bulb.
Dependencies are inferred from the claim text.