Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1998-11-10
2000-10-17
Phan, James
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359205, 359206, 359216, G02B 2608
Patent
active
061340405
ABSTRACT:
A laser scanning system includes a light source for scanning a modulated beam from a laser diode, a collimator lens for forming the beam from the light source into parallel beam, a slit for partially passing the required parallel beam passed through the collimator lens for scanning, a cylinder lens for converging the parallel beam passed through the slit in a sub scan direction, a polygonal rotating mirror rotated at high speed for deflecting the incident beams parallel in a scan direction and converged in the sub scan direction while going through the cylinder lens in the state of having a prescribed view of angle, and a scanning lens system for allowing the beams incident after being deflected by the polygonal rotating mirror to form an image on the scanned surface by converging the incident beams in the scan and sub scan directions, in which two first scanning lens and second scanning lens of a plastic substance constitute the scanning lens system, a first surface of the first scanning lens is formed of a coaxially aspherical surface, a second surface of the first scanning lens and third and fourth surfaces of the second scanning lens are formed of an aspherical toric surface having a rotating axis in the scan direction, and the shape around the optical axis of the scanning lens is to be concave, convex, convex and concave from the first surface in the scan direction and to be concave, convex, concave and convex in the sub-scan direction.
REFERENCES:
patent: 4639072 (1987-01-01), Itoh et al.
patent: 5488502 (1996-01-01), Saito
patent: 5541760 (1996-07-01), Iizuka
patent: 5715079 (1998-02-01), Ono
patent: 5838479 (1998-11-01), Shiraishi
Rim Cheon Seoq
Yi Jong Su
Phan James
Samsung Electro-Mechanics Co.
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