Deflector system which produces dual, oppositely directed scanni

Details Deflector system which produces dual, oppositely directed scanni Deflector system which produces dual, oppositely directed scanni

1994-06-24

1996-01-02

Lerner, Martin

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

359211, 359495, 359566, G02B 518, G02B 530, G02B 2610, G02B 2728

Patent

active

054813840

ABSTRACT:
Centered monofacet deflector systems having a dipole laser beam scanning pattern (dual scanning beams which propagate in opposite directions) enables both the scan rate and the scan duty cycle of the scanning system to be doubled over deflectors which produce only one beam. The deflector may be a non-disc plane diffraction grating (NPDG) deflector or a dual reflecting cube (DRC) deflector having polarization sensitive beam splitting characteristics. The input beam polarization contains or is generated to contain orthogonally polarized components which are reflected or diffracted to produce one of the dual scanning beams and a transmitted beam through the element and retroreflected with the proper polarization to be deflected at the element to produce the other scanning beam thereby providing the capability of two simultaneous or sequential scan lines for every revolution of the deflector element. The deflector systems are useful for imaging applications, especially on recording media mounted on the internal surface of a drum.

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G. F. Marshall, Laser Focus World, vol. 27 169, May 1991 "Optical Feedback Overcomes Scan-Line Wobble in Laser Typesetting".

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