H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/61
H04N 9/12 (2006.01) H04N 9/64 (2006.01)
Patent
CA 1065471
AUTOMATIC BEAM CURRENT LIMITER Abstract of the Invention An amplifier for combining color difference signals with luminance signals and for driving a color image reproducing device includes first and second tran- sistors of opposite conductivity type. Color difference signals are coupled to the base of the first transistor. The emitter of the first transistor is direct current coupled to the emitter of the second transistor. Luminance signals are coupled to the base of the second transistor. Color signals developed at the collector of the first transistor are coupled to the image reproducer. A clamping circuit operates during the horizontal retrace interval to clamp the emitter of the first transistor to a voltage to control the operating point of the amplifier. The voltage is related to the magnitude of the electron beam current drawn by the image reproducer in a manner such that after a predetermined amount of beam current has been drawn, the generation of the electron beam is in- creasingly inhibited with increasing beam current. Since the amplifier which is controlled is supplied with both luminance and chrominance signals, excessive beam currents due to chrominance signals, as well as luminance signals, are inhibited.
251669
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