Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1991-10-07
1992-10-06
Bovernick, Rodney B.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359216, G02B 2608
Patent
active
051537664
ABSTRACT:
A postobjective optical scanner comprising a polygonal optical deflector having a plurality of reflecting surfaces each being a curved surface varying in curvature from position to position thereon; and a correcting lens disposed between the polygonal optical deflector and the objective surface on an optical path, and having a rotationally symmetric curved surface of incidence having a cross section having the shape of an arc of a circle with its center on the axis of rotational symmetry, rotationally symmetric with respect to a plane including the axis of rotation of the polygonal optical deflector and perpendicular to the axis of rotational symmetry and having its power in both the feed direction and the scanning direction, and a surface of departure symmetrical with respect to a plane perpendicular to the scanning direction and having its power in the scanning direction. The combined performance of the correcting effects of the polygonal optical deflector and the correcting lens corrects the curvature of image surfaces and f-.theta. characteristics at a high accuracy.
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Patent Abstracts of Japan, vol. 8, No. 237 (P-310) [1674], 30th Oct. 1984; & JP-A-59 113 409 (Koparu Erekutora K.K.) Jun. 30, 1984.
Patent Abstracts of Japan, vol. 10, No. 358 (P-522) [2415], 2nd Dec. 1986; & JP-A-61 156 020 (Ricoh Co., Ltd) Jul. 15, 1986.
Ikumi Tomonori
Iwafune Yasuo
Matsumoto Yasuo
Murakami Kazunori
Bovernick Rodney B.
Phan James
Tokyo Electric Co. Ltd.
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