Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1977-01-28
1978-08-08
Wilbur, Maynard R.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315397, H01J 2970, H01J 2972
Patent
active
041059336
ABSTRACT:
A vertical deflection circuit comprises a first transistor, the base of which is impressed with a vertical synchronizing signal so that it is turned on during a vertical blanking period, while it is turned off during a vertical scan period, the collector of which is connected to a constant voltage supply and the emitter of which is connected to a capacitor so that the capacitor is charged to a predetermined voltage during the vertical blanking period. A second transistor has its collector connected to the junction point of the emitter of the first transistor and the capacitor, and the base thereof is connected to another constant voltage supply. Two resistors having a low resistance are inserted in series with a vertical deflection coil and the junction point of the resistors is coupled to the emitter of the second transistor through a feedback resistor. The charge stored in the capacitor during the vertical blanking period is discharged through the second transistor during the vertical scan period. Because of the feedback, the discharge current somewhat decreases at an earlier stage of the scan period as compared with at an intermediate stage and somewhat increases at a later stage, whereby a nonlinearity of the circuit between the capacitor and the deflection coil is compensated for and a vertical deflection current of a saw-tooth wave of high linearity is produced.
REFERENCES:
patent: 3868537 (1975-02-01), Haferl
Blum T. M.
Hitachi , Ltd.
Wilbur Maynard R.
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