Method and apparatus for correcting image distortions

Details Method and apparatus for correcting image distortions Method and apparatus for correcting image distortions

1983-02-22

1985-05-21

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

H01J 2956

Patent

active

045188980

ABSTRACT:
A method and apparatus are described for improving the geometric fidelity of images reproduced in a charged particle beam device. The beam is deflected across a sensitive medium to form a test image of predetermined configuration. The test image is compared with a reference image and geometric deviations measured, at a number of points, are used to calculate correction signals required to modify the beam deflection to offset the deviations. Circuit adjustments are then made to provide the calculated correction signals. The correction signal adjustments are accomplished in separate non-interactive circuits for each of a plurality of predetermined corrections which only require a one time adjustment.

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patent: 4142132 (1979-02-01), Harte
patent: 4159484 (1979-06-01), Strathman

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