United States Patent (19) 11 Patent Number: 5,838,480 Mcintyre Et Al
USOO583848OA United States Patent (19) 11 Patent Number: 5,838,480 McIntyre et al. (45) Date of Patent: Nov. 17, 1998 54) OPTICAL SCANNING SYSTEM WITH D. Stephenson, “Diffractive Optical Elements Simplify DIFFRACTIVE OPTICS Scanning Systems”, Laser Focus World, pp. 75-80, Jun. 1995. 75 Inventors: Kevin J. McIntyre, Rochester; G. Michael Morris, Fairport, both of N.Y. 73 Assignee: The University of Rochester, Primary Examiner James Phan Rochester, N.Y. Attorney, Agent, or Firm M. Lukacher; K. Lukacher 57 ABSTRACT 21 Appl. No.: 639,588 22 Filed: Apr. 29, 1996 An improved optical System having diffractive optic ele ments is provided for Scanning a beam. This optical System (51) Int. Cl. ............................................... GO2B 26/08 includes a laser Source for emitting a laser beam along a first 52 U.S. Cl. .......................... 359/205; 359/206; 359/207; path. A deflector, Such as a rotating polygonal mirror, 359/212; 359/216; 359/17 intersects the first path and translates the beam into a 58 Field of Search ..................................... 359/205-207, Scanning beam which moves along a Second path in a Scan 359/212-219, 17, 19,563, 568-570,900 plane. A lens System (F-0 lens) in the Second path has first 56) References Cited and Second elements for focusing the Scanning beam onto an image plane transverse to the Scan plane. The first and U.S. PATENT DOCUMENTS Second elements each have a cylindrical, non-toric lens. One 4,176,907 12/1979 Matsumoto et al. .................... 359/217 or both of the first and second elements also provide a 5,031,979 7/1991 Itabashi.
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