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Proceedings Paper

Relationship between fluctuation in mirror radius (within one polygon) and the jitter
Author(s): Hiroshi Horikawa; Iwao Sugisaki; Masaru Tashiro
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Paper Abstract

This paper analyzes the jitter components due to the mirror in a polygon laser scanner. Before the start of analysis, the following hypothesis was adopted. There are two factors in the condition of mirror facets which affect the high-frequency components of jitter; one is the 'radius variation of the mirror' and the other is the 'curve of the mirror facet.' These two factors can possibly be superimposed. Based on this hypothesis, the following experiments were conducted. The 'radius variation of the mirror' and the 'curve of the mirror facet' of a polygon mirror were independently measured for each mirror facet, and the data were converted to jitter values and then added. Also, a general-purpose jitter measuring optical system was constructed, actual jitter was measured, and the high-frequency components were analyzed. From these experimental results, the jitter values for each mirror facet agreed well with synthetic value. It was concluded that the above-mentioned hypothesis is correct. Here, the 'radius variation of the mirror' represents the dynamic indentation and protrusion during the rotation of the polygon scanner. Therefore, it is the overall 'radius variation of the mirror' which includes the variation produced by the deviation of the mirror which is attached to the spindle motor and axial vibration due to rotation in addition to the polygon mirror's static indentation and protrusion. In the present study, in order to measure the 'radius variation of the mirror,' a new 'radius variation measuring device' has been developed. Also, generally, laser printers contain imaging optical systems such as an F(theta) lens, and the 'radius variation of the mirror' is not directly related to jittering. However, the 'radius variation of the mirror' is one of the important parameters of a polygon scanner. By the present analysis and measurement method, one of the factors of jitter, 'the radius variation of the mirror,' has been clearly evaluated.

Paper Details

Date Published: 1 February 1991
PDF: 14 pages
Proc. SPIE 1454, Beam Deflection and Scanning Technologies, (1 February 1991); doi: 10.1117/12.28056
Show Author Affiliations
Hiroshi Horikawa, Copal Electronics Co. Ltd. (Japan)
Iwao Sugisaki, Copal Electronics Co. Ltd. (Japan)
Masaru Tashiro, Copal Electronics Co. Ltd. (Japan)

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

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