Vertical deflection circuit
AssigneeRedactron Corporation
InventorFrancis C. Marino
Life of this patent
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Abstract
A vertical deflection circuit which vertically deflects the electron beam of a cathode ray tube in response to vertical synchronizing pulses comprises a vertical deflection coil having one end connected to a reference voltage source and the other end connected to a first and second current generating means. The first current generating means generates a current having a repetitive sawtooth waveform which is in synchronism with vertical synchronizing pulses; and the second current generating means generates a constant current whose amplitude is selectively adjustable to control the vertical starting position of the electron beam of the cathode ray tube.
Claims11
Vertical deflection circuit for vertically deflecting the electron beam of a cathode ray tube in response to vertical synchronizing pulses comprising a vertical deflection coil, a reference voltage source connected to one end of said vertical deflection coil, a first current generating means connected to the other end of said vertical deflection coil, for generating a current having a repetitive sawtooth waveform in synchronism with the vertical synchronizing pulses, and a second current generating means, connected to the other end of said vertical deflection coil, for generating a constant current whose amplitude is selectively adjustable in order to control the vertical starting position of the electron beam of the cathode ray tube.
Dependencies are inferred from the claim text.