Optical: systems and elements – Deflection using a moving element
Patent
1993-02-23
1995-08-01
Ben, Loha
Optical: systems and elements
Deflection using a moving element
359218, 359488, 359584, G02B 2608
Patent
active
054384460
ABSTRACT:
A uniform reflectance mirror deflector of an optical scanner for scanning a light beam onto an image object or a receiving medium. The scanner includes a rotatable polygon-shaped mirror having a plurality of planes reflective mirror facets for deflecting and thereby scanning the beam through a predetermined angle while rotating and thereby varying the angle of incidence of the light beam on the deflector. In order to achieve relative uniformity of reflectance and avoid intensity variations in the reflected beam, a protective optical coating layer is selected to have a thickness which minimizes variation in reflectance over the range of angular displacement of the mirror in relation to the light source during its rotation. The thickness of the protective coating layer uniformly applied over the entire surface of each facet of the polygon-shaped mirror is determined by calculating the reflectance of P-polarized and S-polarized incident radiation components at a predetermined wave length of incident radiation over a range of protective coating film thicknesses of between 0 and one wave length and over the range of angles of incidence. Coating thicknesses in this range are selected in accordance with the resulting demonstrated relative uniformity of reflectance.
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Patent Abstracts of Japan, vol. 9, No. 24 (P-331) 31 Jan. 85 & JP-A-59168411 (Hitachi) 22 Sep. 84.
Ben Loha
Eastman Kodak Company
Noval William F.
Phan James
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