Image tube circuit

Details Image tube circuit Image tube circuit

H - Electricity

04

N

355/13

H04N 3/16 (2006.01) H04N 5/228 (2006.01)

Patent

CA 1246243

ABSTRACT OF THE DISCLOSURE 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 is disclosed. The apparatus includes a circuit for generating a saw-tooth signal having a first portion for causing the beam to scan a raster 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 changing circuit to the deflection device whereby the electron beam on the over-scan area of the target screen is defocused.

493625

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