Browse Prior Art Database

SCAN CARRIAGE POSITION SENSOR

IP.com Disclosure Number: IPCOM000026283D
Original Publication Date: 1991-Feb-28
Included in the Prior Art Database: 2004-Apr-05
Document File: 2 page(s) / 92K

Publishing Venue

Xerox Disclosure Journal

Abstract

Figure 1 is a side view of scan system 10 while Figure 2 is a top view of scan system 10. One of the major functions of scan system 10 is to move the optical scan components under the original document being scanned while limiting image motion. Typically, a carriage 12 is designed to house the optical elements and is driven by cables 14 at one or both ends.

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XEROX DISCLOSURE JOURNAL

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SCAN CARRIAGE POSITION SENSOR
Daniel W. Costanza

Proposed Classification US. C1.355/235
Int. C1. G03g 15/28

10 - 7

-

- 10

18 l-y a M

FIG. 2

XEROX DISCLOSURE JOURNAL - Vol. 16, No. 1 January/February 1991 39

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

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SCAN CARRIAGE POSITION SENSOR(Cont'd)

Figure 1 is a side view of scan system 10 while Figure 2 is a top view of scan system 10. One of the major functions of scan system 10 is to move the optical scan components under the original document being scanned while limiting image motion. Typically, a carriage 12 is designed to house the optical elements and is driven by cables 14 at one or both ends.

In many cases, scan system 10, as shown, is driven by a servo system that includes an encoder 20 mounted to a servo motor 18. Encoder 20 is used by the servo system to measure the motion of motor 18. The servo system monitors the error between an encoder signal from encoder 20 and a reference command signal thus, attempting to drive the resulting error to a value of zero. In actuality, the optics system mounted inside carriage 12 is the component whose motion must be controlled accurately. Therefore, by having controlled the motion of servo motor 18 via the servo controller, the mechanical drive system must be designed to move the optical elements inside carriage 12 in response to servo motor 18 without accumulating errors that will exceed the allowable motion limits. In orde...