Scanner with a post-facet lens system

Details Scanner with a post-facet lens system Scanner with a post-facet lens system

G - Physics

02

B

G02B 26/10 (2006.01) G02B 26/12 (2006.01) G02B 27/00 (2006.01) H04N 1/113 (2006.01)

Patent

CA 2057904

2057904 9114959 PCTABS00007 A scanner (10, 110) includes a light source (11) for producing a light beam (12) and a multifaceted polygon (15) for directing the light beam (12) to a spot on a surface to be scanned, such as the surface of a photoreceptor (13) or a document to be read, that is located at a predetermined location relative to the polygon (15) and for moving the spot across the surface along a scan line (19) of predetermined length. The scanner (10, 110) also includes a post-facet lens system (30, 130) with first and second elements (31, 32, 131, 132) configured to compensate for field curvature and wobble without introducting aberrations by not compensating for scanner non-linearity. The elements may be made of plastic despite sensitivity of its refractive index to temperature changes.

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