The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 17, 1987
Filed:
Apr. 02, 1985
Jasper S Chandler, Rochester, NY (US);
David Kessler, Rochester, NY (US);
Edward Muka, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
A laser printer is disclosed which uses a rotating polygon and a cylindrical mirror disposed between the polygon and an image zone. The cylindrical mirror corrects for pyramidal errors in an output image formed on a moving photosensitive member disposed at the image zone by making the operative polygon facet and the image zone optically conjugate in the page scan direction. To change the length of the image in the line scan direction at the image zone, the distance between the polygon and image zone is varied. This is accomplished by moving the cylindrical mirror or by positioning a different cylindrical mirror at a new optical path position. The velocity of the photosensitive member is adjusted to change the length of the output image in the page scan direction. The tilt angle of the cylindrical mirror moved to the new optical path position is changed or the cylindrical mirror is removed from the path and a different cylindrical mirror is inserted at a new optical path position. In either case, at the new image format size, the cylindrical mirror makes the operative polygon facet optically conjugate with the image zone in the page scan direction to correct for pyramidal errors. Anamorphic beam shaping optics are provided which preceed the polygon to form and position the line scan waist so that it is adjacent to the image zone at different line scan lengths, and to change the beam size at the polygon in the page scan direction at different page scan lengths.