CRT beam deflection system

Details CRT beam deflection system CRT beam deflection system

1992-10-01

1993-08-24

Issing, Gregory C.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315370, 358485, G09G 104, H01J 2956

Patent

active

052392430

ABSTRACT:
Disclosed is a system having a memory mapped deflection to control the position of an electron beam within a CRT used to project a color image onto a photographic medium for printing. A horizontal position counter is incremented at a linear rate, and the counter value is translated, using a translation table stored in memory, into a current used to drive the yoke of the CRT. The translation introduces non-linearities into the output voltage which results in a linear forward sweep across the CRT. A sweep direction signal is used as an address bit of the translation table, to allow an optimized retrace motion profile which results in an improved linear beam motion across the face of the CRT during the forward sweep immediately following retrace.

REFERENCES:
patent: 3809948 (1974-05-01), Chubb
patent: 4314179 (1982-02-01), Tooyama et al.
patent: 4670778 (1987-06-01), Miyakawa
patent: 4754334 (1988-06-01), Krix et al.

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