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Proceedings Paper

Butterfly line scanner: rotary twin reflective deflector that desensitizes scan-line jitter to wobble of the rotational axis
Author(s): Gerald F. Marshall; Thomas J. Vettese; John H. Carosella
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Paper Abstract

Random jitter of the rotational axis in scanners produces scan-line tracking errors that are unacceptable in the laser typesetting and printing industry. The design of the Butterfly scanning device nullifies scan-line cross-scan tracking errors stemming, in part, from bearing wobble. Terms and expressions associated with types of line scanning systems and reflective rotary scanning devices are defined. The essential features of an Axe-Blade scanner, a two- facet scanning device, and the principles of a Butterfly scanner, a two piece, four-facet scanning device, are described. The symmetry of the Butterfly scanner simplifies its design and construction, its alignment and dynamic balancing; and leads to a compact unit. The design uses commercially available bearings, and achieves scanned beam accuracies in the arcsecond and the subarcsecond ranges that, in general, require gas bearings.

Paper Details

Date Published: 1 February 1991
PDF: 9 pages
Proc. SPIE 1454, Beam Deflection and Scanning Technologies, (1 February 1991); doi: 10.1117/12.28071
Show Author Affiliations
Gerald F. Marshall, Consultant in Optical Design & Engineering (United States)
Thomas J. Vettese, Speedring Systems, Inc. (United States)
John H. Carosella, Speedring Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 1454:
Beam Deflection and Scanning Technologies
Leo Beiser; Gerald F. Marshall, Editor(s)

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