Electromagnetic focus apparatus

Details Electromagnetic focus apparatus Electromagnetic focus apparatus

1998-01-07

2000-01-04

Westin, Edward P.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

3153821, 315371, H01J 2958

Patent

active

060113650

ABSTRACT:
The focus coil 14 adjusts the focal point of electron beam which forms raster. The electromagnetic focus apparatus controls the ON/OFF-combinations of the respective switches 42 to 45 in synchronization with the horizontal synchronization signal S1. By this ON/OFF-controlling, the current waveform is formed, which is supplied into the focus coil 14. The microcomputer 55 adjusts the timing of the ON/OFF-controlling of the respective switches 42 to 45 in compliance with the horizontal amplitude value of the electron beam.

REFERENCES:
patent: 3911295 (1975-10-01), Barkow
patent: 4499457 (1985-02-01), Hintze
patent: 4587464 (1986-05-01), Ho et al.
patent: 5381179 (1995-01-01), Perreaut et al.
patent: 5382888 (1995-01-01), Perreaut et al.
patent: 5512804 (1996-04-01), Yamamoto
patent: 5747949 (1998-05-01), Gyoten et al.

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