Browse Prior Art Database

A GATED OSCILLATOR PARTICULARLY SUITED FOR AOM DRIVERS

IP.com Disclosure Number: IPCOM000024955D
Original Publication Date: 1983-Feb-28
Included in the Prior Art Database: 2004-Apr-04
Document File: 2 page(s) / 97K

Publishing Venue

Xerox Disclosure Journal

Abstract

Acousto Optic Modulators (AOM) used in Raster Output Scanner (ROS) systems are driven by a pulsed high frequency signal. There is here proposed a scheme for driving AOMs which is simpler and uses fewer components than previous designs.

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A GATED OSCILLATOR PARTICULARLY SUITED FOR AOM DRIVERS
Donald C. Wilson

Proposed Classification
U.S. Cl. 332/13 Int. Cl. H03k 7/00

0

-

FIG. I

pvcc

FIG. 2a

TO: AOM

f

27 Volume 8 Number 1 January/February 1983

FIG. 2b

[This page contains 1 picture or other non-text object]

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A GATED OSCILLATOR PARTICULARLY SUITED FOR AOM DRIVERS (Cont'd)

Acousto Optic Modulators (AOM) used in Raster Output Scanner (ROS) systems are driven by a pulsed high frequency signal. There is here proposed a scheme for driving AOMs which is simpler and uses fewer components than previous designs.

When a high frequency signal is applied to an AOM, the laser beam passing through the modulator is deflected. In ROS systems applications, this deflected beam is then used to expose a photoreceptor. In the absence of a signal to the AOM, the laser beam passes undeflected through the modulator and is then terminated into a beam stop. The purpose of the AOM driver is to generate and modulate, in an on/off fashion, the high frequency signal which is applied to the modulator. A video signal is supplied to the driver to provide control of the on/off modulation.

As shown in Figure 1, present driver designs have three major sections. These are;
(1) the oscillator 5 which generates the high frequency or carrier signal and which may be either fixed or swept, (2) the mixer 6 which modulates the carrier in response to the video control signal, and (3) the amplifier 7 which boosts the modulated signal to the required level. Typical circuits presently used consist of a di...