Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1996-11-07
1998-07-07
Phan, James
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359207, 359216, 359217, G02B 2608
Patent
active
057777748
ABSTRACT:
A reflection type scanning optical device comprises a rotatable polygonal mirror arranged so that a light beam deflected from the polygonal mirror is separated from the light beam incident thereto, a first curved mirror having a negative power in the main scanning direction to reflect the deflected light beam from the polygonal mirror toward the polygonal mirror, a second curved mirror having a positive power in the main scanning direction to reflect the light beam reflected from the first curved mirror toward the first curved mirror, and a toric lens having a positive power at least in the auxiliary scanning direction to converge the light beam reflected from said second curved mirror and to form a spot on a surface to be scanned.
REFERENCES:
patent: 5220449 (1993-06-01), Kuroda
patent: 5408095 (1995-04-01), Atsuumi et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Phan James
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