Scanning optical system capable of automatic focusing

Details Scanning optical system capable of automatic focusing Scanning optical system capable of automatic focusing

1992-06-25

1993-06-15

Ben, Loha

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359204, 359216, 250235, 346108, G02B 2608

Patent

active

052204502

ABSTRACT:
A scanning optical system capable of automatic focusing includes a gas laser 10 for emitting writing beam, a polygonal mirror 20 for deflecting and reflecting the rays of light from the gas laser 10, a scanning lens 40 that is telecentric with respect to an image plane 30 and which focuses the deflected rays of light to form an image on the image plane, a focus detector 50 that receives the reflected light from the image plane 30 to detect the state of focusing on the plane by the scanning lens 40, and a focus adjusting unit 60 that brings the scanning lens 40 into focus on the image plane 30 on the basis of the output of the focus detector 50. This optical system can be properly corrected for the image plane in such a way that it will not be out of the depth of focus on account of its waviness, tilting and other phenomena even if the F number of the system is reduced.

REFERENCES:
patent: 4163600 (1979-08-01), Russell
patent: 4321700 (1982-03-01), Russell
patent: 4620089 (1986-10-01), Schlichting et al.
patent: 4733064 (1988-03-01), Ishikawa
patent: 4912487 (1990-03-01), Porter et al.
patent: 5036347 (1991-07-01), Tsunekawa et al.
patent: 5103091 (1992-04-01), Hirose et al.
patent: 5122658 (1992-06-01), Ando

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