Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-07-05
1998-06-09
Dzierzynski, Paul M.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359206, 359207, 359662, 347258, G02B 2608
Patent
active
057643997
ABSTRACT:
A scanning (f.theta.) lens includes first, second, third, and fourth lenses, respectively having negative, positive, positive, and negative power in at least the main scanning directions. The lenses are arranged in order from a polygon mirror to a drawing surface. The Abbe number of the fourth lens is less than 40. In a further refinement, the Abbe number of the fourth lens subtracted from half the difference between the Abbe numbers of the second and third lenses is greater than 20. In another refinement, the scanned surface side surface of the first lens element is a cylindrical surface having negative power only in the auxiliary scanning direction, and the scanned surface side surface of one of the second or third lens elements is a toric surface having greater positive power in the auxiliary scanning direction than in the main scanning direction.
REFERENCES:
patent: 4527858 (1985-07-01), Takahasi et al.
patent: 4756583 (1988-07-01), Morimoto
patent: 5270851 (1993-12-01), Makino et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Dzierzynski Paul M.
Schuberg Darren E.
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