Light beam scanning device
Device for scanning a light beam at a constant speed
Scanner with reflective pyramid error compensation Patent #: 4247160
ApplicationNo. 06/433340 filed on 10/08/1982
US Classes:359/208, Concave reflector359/218Having six, seven, or eight facets
ExaminersPrimary: Corbin, John K.
Assistant: Gass, Rebecca D.
Attorney, Agent or Firm
International 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.