X-ray apparatus

Details X-ray apparatus X-ray apparatus

1987-12-16

1989-05-02

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Source

Electron tube

378137, 378207, H01J 3514

Patent

active

048274941

ABSTRACT:
X-ray apparatus of the type in which X-rays are generated by an electron beam impinging on a focal spot on a metal target. Heat from the focal spot is focused onto a lateral effect photodiode, the electrical output of which changes with changes in the position of the focal spot. This output is fed back to the electron beam deflection coils to change the direction of the electron beam and steer it back toward the original, intended position of the focal spot on the target.

REFERENCES:
patent: 2946892 (1960-07-01), Bas-Taymaz
patent: 3955089 (1976-05-01), McIntyre et al.
patent: 4356400 (1982-10-01), Polizzi et al.
patent: 4442539 (1984-04-01), Aichinger et al.
patent: 4464778 (1984-08-01), Goldmann
patent: 4532646 (1985-07-01), Gilbert
patent: 4675891 (1987-06-01), Plessis et al.
"Position Sensing with Lateral Effect Photodiodes", B. O. Kelly, Proc. SPIE, vol. 129, 1977.

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