Methods and apparatus for post-assembly custom fine-tuning of an electron beam characteristic in a cathode ray imaging tube
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United States of America Patent
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Nov 14, 1989
Grant Date -
N/A
app pub date -
Nov 10, 1988
filing date -
Nov 10, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An internal electrostatic field-generating, beam-controlling element in a cathode ray tube is formed by depositing an initially continous layer of resistive material on a substrate and applying a voltage differential across the coating to generate a field-generating current therethrough during operation of the tube. After completion of tube assembly and sealing of the tube envelope, the element is custom fine-tuned by projecting an externally-originating laser beam through the envelope wall to selectively remove portions or areas of the resistive material, thereby predeterminately distorting the electrostatic field and selectively changing the effect of the field on the imaging electron beam. This procedure readily enables both correction of perceived deficiencies in and intentional modifications to one or more characteristics of the electron beam.
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