CRT magnetic field compensation

Details CRT magnetic field compensation CRT magnetic field compensation

1987-11-09

1989-09-05

Yusko, Donald J.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Pulse storing

315370, 313430, H04N 929

Patent

active

048641928

ABSTRACT:
As CRT display is housed in a magnetic shield to reduce the image distortions caused by the external magnetic field produced by an NMR scanner. To further improve image quality, three sets of compensating coils are positioned around the CRT display and inside the shield to produce magnetic fields which offset the effects of the residual external magnetic field components that penetrate the shield or enter through the window in the shield used to view the CRT screen.

REFERENCES:
patent: 2994803 (1961-08-01), Goldberg
patent: 3809889 (1974-05-01), McBroom
patent: 3879633 (1975-04-01), Stark, Jr.
patent: 4316119 (1982-02-01), Cooper
patent: 4556821 (1985-12-01), Cooper

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