Browse Prior Art Database

Deflection Drive System

IP.com Disclosure Number: IPCOM000080184D
Original Publication Date: 1973-Nov-01
Included in the Prior Art Database: 2005-Feb-27
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Moore, RD: AUTHOR

Abstract

This is an electron-beam deflection drive system with improved accuracy and speed. A high-resolution digital-to-analog converter (DAC) is used in place of a conventional current source, registration circuits, retrace amplifier, and integrator amplifier.

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Deflection Drive System

This is an electron-beam deflection drive system with improved accuracy and speed. A high-resolution digital-to-analog converter (DAC) is used in place of a conventional current source, registration circuits, retrace amplifier, and integrator amplifier.

If, for example, a 14-bit DAC is utilized it would resolve a ramp of voltage or current into 214 steps. This is 16,384 steps which is equivalent to 60 ppm resolutions. The DAC would be stepped to count from 0 to 16,383 in equal steps and timed to correspond to the required sweep speed. The time constant of the coil driver and deflection coil is adjusted to smooth the steps to an acceptable level, which is a function of the system requirements.

A further advantage of this deflection technique, is its ability to go directly to any one of the resolvable positions in a given field. This allows the circuitry to be used for registration operations by programming the location of the registration marks, and then by counting up the DAC and sweeping through the registration marks. Sweep speeds are variable by adjusting the counting rate.

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