Image tube circuit

Details Image tube circuit Image tube circuit

1985-10-24

1987-02-24

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

358217, H01J 2956

Patent

active

046459839

ABSTRACT:
An apparatus for controlling the deflection of an electron beam in an image pick-up tube of the type including a target screen, an electron gun for generating the electron beam, and a deflection device for causing the generated electron to scan the target screen includes a circuit for generating a saw-tooth signal having a first portion for causing the beam to scan a raster or effective image area on the target screen at a first scan velocity and a second portion for causing the beam to scan an over-scan area on the target screen outside of the raster image area at a second scan velocity faster than the first scan velocity, a circuit for changing the average level of the second portion of the saw-tooth signal relative to that of the first portion of said saw-tooth signal, and a circuit for supplying the output of the level changing circuit to the deflection device so that the electron beam is defocused on the over-scan area of the target screen for fully scanning such over-scan area.

REFERENCES:
patent: 4439713 (1984-03-01), Nakamura et al.

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