Browse Prior Art Database

CIRCULATING SCAN MECHANISM

IP.com Disclosure Number: IPCOM000026601D
Original Publication Date: 1992-Dec-31
Included in the Prior Art Database: 2004-Apr-06
Document File: 4 page(s) / 161K

Publishing Venue

Xerox Disclosure Journal

Abstract

In a high speed digital input scanner, both the configuration and implementation of the mechanical hardware place limits on the design. The challenge is to create a scanning mechanism which is capable of moving a sensor device across a fixed document quickly, accurately, and reliably.

This text was extracted from a PDF file.
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XEROX DISCLOSURE JOURNAL

CIRCULATING SCAN MECHANISM Proposed Classification Gregory E. Bell U.S. C1.355/055

Int. C1. G03b 27/52

FIG. I

XEROX DISCLOSURE JOURNAL Vol. 17 No 6 November/December 1992 433

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CIRCULATING SCAN MECHANISM(Cont'd)

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14

FIG. 3

434 XEROX DISCLOSURE JOURNAL Vol17 No 6 November/December 1992

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CIRCULATING SCAN MECHANISM(Cont'd)

In a high speed digital input scanner, both the configuration and implementation of the mechanical hardware place limits on the design. The challenge is to create a scanning mechanism which is capable of moving a sensor device across a fixed document quickly, accurately, and reliably.

In a fixed platen scanning system, a document is placed on a platen surface wherein some form of sensing optics scans beneath it to read the document. When a scan is complete, the reciprocating mechanism retraces its path and prepares for the next scan. Conventional scanning mechanisms are limited in configuration by their function and means of implementation. Specifically, they use full rate and half rate scanning mirror mechanisms.

When moving mirrors are used to maintain a fixed optical conjugate length, they require a return stroke to prepare for the next scan. In a high speed application, the start-stop motion between scans places severe demands upon the motor and electronic motion control system. As speed requirements increase, so do the requirements of each component within the scan mechanism.

The present invention eliminates the scan retrace function by utilizing an amorphous silicon full width sensor bar in place of a scanning mirror, thereby reducing the requirements on the associated drive motor and control system. Figure 1 illustrates a scan mechanism 10, wherein the bidirectional motion of conventional scanning is replaced with a continuous circulating motion 18. The circulating scan mechanism resembles a flattened ferris wheel where the chair remain in an upright position. Scan sensor 12 is mounted to drive belt
14. The scan sensor moves linearly in one direction to scan and then drops away from the platen 16 for its return.

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