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Proceedings Paper

Design and evaluation of molded plastic laser-scanning optics using a concave f-theta mirror
Author(s): Akiyoshi Hamada; Muneo Kuroda
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Paper Abstract

A laser scanning optics module for use with a compact laser printer has been developed. This optics module features an f-theta concave mirror made from precision molded plastic rather than polished glass and which gives 300 dots per inch resolution. Compared with Minolta's previous compact laser printer, the size of the module has been reduced by forty percent and the production costs of the module have been halved. The reduction in size is achieved both by providing a forty percent wider scanning angle than that used previously and by using the concave f-theta mirror to reflect the scanning beam back in the direction from which it came. The production costs have been reduced by replacing the three glass lenses used in the previous module with two molded plastic elements of a single concave f- theta mirror and a single toroidal lens. It was calculated by using simulation software, and subsequently verified in practice, that even when submitted to a temperature increase of forty degrees centigrade from the normal, the performance of this optics module is ensured. Because of the different rates of expansion between the module and the optical elements themselves as the temperature increases, plate springs are used to hold the elements in place, thus eliminating any strain on the optical surfaces. During the test, the spot diameters and the scanning line position of the optics were found to have the same degree of variation as the glass elements which had previously used.

Paper Details

Date Published: 1 August 1990
PDF: 12 pages
Proc. SPIE 1254, Optical Hard Copy and Printing Systems, (1 August 1990); doi: 10.1117/12.19845
Show Author Affiliations
Akiyoshi Hamada, Minolta Camera Co., Ltd. (Japan)
Muneo Kuroda, Minolta Camera Co., Ltd. (Japan)

Published in SPIE Proceedings Vol. 1254:
Optical Hard Copy and Printing Systems
Victor A. Files; David Kessler, Editor(s)

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