H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/65
H04N 9/24 (2006.01)
Patent
CA 1121046
SO1235 ABSTRACT OF THE DISCLOSURE Horizontal scanning rate correction apparatus is pro- vided for beam index color cathode-ray tubes of the type having a screen, an electron gun for projecting an electron beam upon the screen, a plurality of index elements positioned to be struck by the electron beam as it scans across the screen, a deflection device for causing the electron beam to repeatedly scan across the screen in a vertical succession of horizontal lines, and an index signal processing circuit for producing an index signal having a frequency determined by the frequency of the incidence of the electron beam upon the index elements as it scans horizon- tal lines and for controlling color switching circuitry which determines which of a plurality of color signals modulates the intensity of the electron beam. The horizontal scanning rate correction apparatus includes a memory circuit for storing correction values derived from the index signal processing cir- cuit during horizontal scanning by the electron beam and repre- senting the deviation of the horizontal scanning rate from desired scanning rate at each of a plurality of horizontal sampling positions along a horizontal line. The apparatus further includes circuitry for reading the correction values from the memory circuit and for producing a corresponding signal which is supplied to the electron beam deflection device to substan- tially cancel deviations in the horizontal scanning rate. -1-
341124
Hosono Takashi
Isono Katsuo
Mitamura Ichiro
Gowling Lafleur Henderson Llp
Sony Corporation
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