Importance

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Abstract

Disclosed is a system having a vertical position register and a horizontal deflection controller to position an electron beam within a CRT used to project an image onto a photographic medium for printing. When data is being displayed on the CRT, the beam is positioned vertically to the desired color phosphor row and then swept across the face of the CRT while the data is used to modulate the beam. During retrace, the beam is stopped at the center of the CRT and displaced vertically to a home position while waiting for the next dot row of information. The home position is located above the center of the phosphor area so that no leakage occurs if the beam remains in the home position for extended periods. Furthermore, while in the home position at the center of the CRT, the horizontal deflection amplifier dissipates a minimum amount of power.

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First Claim