Automatic closed loop scaling and drift correcting system and me

Details Automatic closed loop scaling and drift correcting system and me Automatic closed loop scaling and drift correcting system and me

1986-05-01

1989-03-14

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358 67, 358 69, H01J 2956, H04N 924

Patent

active

048127132

ABSTRACT:
Reference beam deflection command values are assigned to respective pinholes at two diametrically opposite corners of a cathode ray screen. The pinholes sense actual beam position by transmitting light via respective fiberoptic cables to a detector arrangement remote from the electrostatic fields at the screen. Command values corresponding to actual beam alignment with the pinholes are determined and compared to the preselected reference beam deflection values, to produce corrections required to compensate for image scaling and/or center drift errors. With stroke type image generation, special beam search patterns are generated in the vicinity of the pinholes to activate the detector arrangement.

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