Browse Prior Art Database

REFLECTIVE FLAT FIELD OPTICAL SYSTEMS

IP.com Disclosure Number: IPCOM000024061D
Original Publication Date: 1979-Aug-31
Included in the Prior Art Database: 2004-Apr-02
Document File: 2 page(s) / 195K

Publishing Venue

Xerox Disclosure Journal

Abstract

Beams from a laser 2 are imaged via a relay lens 4 and spot-forming optics 6 so as to form beam diameters of the correct size and location near a first cylinder lens 8 after reflection from a folding mirror 9, Cylinder lens 8 acts in the tangential direction (the scan direction) to converge the laser beam to an aerial focus so as to fill the full aperture of a prescan objective (achromatic doublet) lens 10. Operating on-axis, the prescan objective lens reimages the aerial image created by the cylinder lens S at the document plane 12, Located between the prescan objective

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XEROX DISCLOSURE JOURNAL

REFLECTIVE FLAT FIELD OPTICAL

SYSTEMS
D. A. Grafton Wai-Min Liu
H. D. Wolpert

Proposed Classification
U.S. Cl. 350/175 Int. CL G02b 15/02

Beams from a laser 2 are imaged via a relay lens 4 and spot-forming optics 6 so as to form beam diameters of the correct size and location near a first cylinder lens 8 after reflection from a folding mirror 9, Cylinder lens 8 acts in the tangential direction (the scan direction) to converge the laser beam to an aerial focus so as to fill the full aperture of a prescan objective (achromatic doublet) lens 10. Operating on-axis, the prescan objective lens reimages the aerial image created by the cylinder lens S at the document plane 12, Located between the prescan objective

lens and the document plane are a multi-faceted, rotating polygon 14, a field flattening mirror 16, and a second cylindrical lens 18, By scanning onto a field flattening mirror, which is almost flat, the normally curved focal plane of the system is transformed into a flat plane.

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Volume 4 Number 4 July/August 1979 477

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                  XEROX DISCLOSURE JOURNAL 478 Volume 4 Number 4 July/August 1979

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