Method of correcting curvature of image surface and optical beam

Details Method of correcting curvature of image surface and optical beam Method of correcting curvature of image surface and optical beam

1996-09-19

1998-09-15

Phan, James

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359205, 359207, 359212, 359213, 359214, 359216, G02B 2608

Patent

active

058087745

ABSTRACT:
In an optical beam scanning apparatus in which an optical beam from a light source impinges upon a deflecting system and a deflected optical beam from said deflecting system scans a surface-to-be-scanned through a scanning lens in a main scanning direction, with a curvature of image surface correction method of the present invention, curvature of image surface is reduced without improving the surface accuracy of the scanning lens. A lens holder (14) is freely movable on an optical base (3) along a guide (15). When an adjustment screw (16) is manipulated, the lens holder (14) is moved so that a collimator lens (12) is moved along an optical axis (OA) and positioned. As the collimator lens (12) is moved, the degree of parallel of an optical beam which is emitted toward a galvanometer (30) is changed and the shape of an image surface is adjusted, so that the image surface is positioned within the depth of focus of the optical beam scanning apparatus over an entire scanning range. Hence, it is possible to perform drawing with an excellent image quality.

REFERENCES:
patent: 4547038 (1985-10-01), Mori
patent: 4941719 (1990-07-01), Hisada et al.
patent: 5054866 (1991-10-01), Tomita et al.
patent: 5134511 (1992-07-01), Shiraishi et al.
Patent Abstracts of Japan, vol. 13, No. 007 (P-810) 10 Jan. 1989; JP-A-63 216018, Sep. 8, 1988.
Patent Abstracts of Japan, vol. 8, No. 038, (P-255), 18 Feb. 1984; JP-A-58 190920, Nov. 8, 1983.

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