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CORRECTION OF WOBBLE AND CENTRATION ERRORS IN HOLOGRAPHIC SCANNERS VIA BALANCING TECHNIQUES

IP.com Disclosure Number: IPCOM000024520D
Original Publication Date: 1980-Dec-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 60K

Publishing Venue

Xerox Disclosure Journal

Abstract

In the employment of disk-type holographic scanners, it is known that spinner wobble is the major contributing factor to unwanted cross-scan motion since this device is essentially free of pyramidal error. The cross-scan motion results from tilting of the spinner surface when it wobbles, thus causing a tilting of the deflected beam. It has been shown that reduction of wobble can be achieved if the spinner is connected to the drive motor by means of a flexible or dynamic mounting arrangement which allows the rotating disk to align itself in response to the mechanical forces produced by the rotation.

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XEROX DISCLOSURE JOURNAL

CORRECTION OF WOBBLE AND CENTRATION ERRORS IN HOLOGRAPHIC SCANNERS VIA BALANCING TECHNIQUES Charles J. Kramer

Proposed Classification
U.S. C1. 350/285 Int. Cl. G05d 25/00

In the employment of disk-type holographic scanners, it is known that spinner wobble is the major contributing factor to unwanted cross-scan motion since this device is essentially free of pyramidal error. The cross-scan motion results from tilting of the spinner surface when it wobbles, thus causing a tilting of the deflected beam. It has been shown that reduction of wobble can be achieved if the spinner is connected to the drive motor by means of a flexible or dynamic mounting arrangement which allows the rotating disk to align itself in response to the mechanical forces produced by the rotation.

The concept of this disclosure is to alter the distribution of mass within the disk in such a way that the surface carrying the holographic grating will be oriented in a plane perpendicular to the rotor axis. This alteration of mass can be achieved by machining the disk using a laser balancing method in which an energetic laser is used to remove material from the spinning disk in response to information obtained from balance sensing and surface orienting electronics. It is also understood that other machining techniques such as drilling or electric arc could be used to perform the balancing, surface orienting or centering operations.

Volume 5 Number 6 November/December 1980 61...