X-ray image tube and manufacture thereof
AssigneeKabushiki Kaisha Toshiba
InventorsTakashi Noji, Junichi Takahashi, Yuuichi Murakoshi
Life of this patent
Estimating the term…
Abstract
An X-ray image tube according to the present invention has a whole evacuated envelope comprising an metallic input window through which X-rays pass, a metallic frame to which the metallic input window is welded, a hollow cylinder portion, an output window, etc., and the metallic input window and the metallic frame are hermetically welded to each other by ultrasonic welding. By means of such a construction, an X-ray image tube which can suppress occurrence of distortion of an electronic lens formed in the evacuated envelope, and a manufacturing method thereof is realized.
Claims24
An X-ray image tube comprising:
- an evacuated envelope comprising,
- a metallic input window allowing penetrating X-rays,
- a metallic frame hermetically sealed with the metallic input window at a peripheral portion of the metallic input window by means of ultrasonic welding;
- an input screen located directly to the inner surface of the metallic input window or closely thereto of being fixed to another substrate, converting the X-rays into electrons,
- an electron-passing-through electrode permitting the electrons emitted out of the input screen to pass through, and
- an output screen obtaining an optical or electrical output signal in compliance with receiving the electrons coming via the electron-passing-through electrode.
A manufacturing method of an X-ray image tube comprising, an evacuated envelope containing a metallic input window allowing penetrating X-rays and a metallic frame hermetically sealed with a peripheral portion of the metallic input window,
- an input screen located directly to the inner surface of the metallic input window of the evacuated envelope or closely thereto being fixed to a substrate, converting the X-rays into electrons,
- an electron-passing-through electrode permitting the electrons emitted out of the input screen to pass through, and
- an output screen obtaining an optical or electrical output signal in compliance with receiving the electrons coming via the electron-passing-through electrode, wherein
- the hermetically sealing of the peripheral portion of the metallic input window to the metallic frame is carried out by means of ultrasonic welding.
Dependencies are inferred from the claim text.