Scanner optics with no cross scan field curvature
Patent 4512625 Issued on April 23, 1985. Estimated Expiration Date: 
October 8, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
October 8, 2002. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesLight beam scanning device Device for scanning a light beam at a constant speed Scanner with reflective pyramid error compensation Patent #: 4247160 InventorAssigneeApplicationNo. 06/433340 filed on 10/08/1982US Classes:359/208, Concave reflector359/218Having six, seven, or eight facetsExaminersPrimary: Corbin, John K.Assistant: Gass, Rebecca D. Attorney, Agent or FirmInternational ClassesH04N 1/113 (20060101)G02B 27/00 (20060101) G02B 26/12 (20060101) AbstractA lens system is described which allows a scan spot in a flying spot scanning system on the image surface to be focused in the cross scan plane and at the same time correcting field curvature distortion. The use of a first lens element having negative power in the scan direction and a second lens element having positive power in the cross scan plane on the front surface and positive power in scan plane on the rear surface allows a light from a laser to be reflected from a rotating polygon to be reflected from a concave cylindrical mirror onto a xerographic or other photosensitive surface.Other References
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