Resolution improvement in flying spot scanner

Details Resolution improvement in flying spot scanner Resolution improvement in flying spot scanner

1990-11-06

1992-04-07

Arnold, Bruce Y.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359223, 359900, 359305, 250235, G02B 2608, H01J 516, G02F 111

Patent

active

051033348

ABSTRACT:
An improved flying spot scanner (48, 68) is disclosed, which is particularly applicable to use with a raster output scanner (ROS). The primary scan provided by an ROS is a continuous scan of the optical beam (26) along the scan line (40). The present invention provides a discontinuous pixel-by-pixel scan in the opposite direction to the continuous primary scan. Thus each pixel is positioned statically at its correct location on the photoreceptor (54) during the pixel's duration. At the end of each pixel's duration, the beam snaps rapidly to the position of the next pixel. Use of this invention will form a non-blurred image of each pixel on the photoreceptor (54). The invention uses an optical deflector (50, 70) to drive the beam opposite to the direction of the primary beam scan during each pixel's duration. The optical deflector (50, 70) may be an angle deflector (50) when used in a collimated optical beam (60), or it may be a translation deflector (70) when used in a non-collimated optical beam (72). This invention provides a flying spot scanner (48, 68) in which all the gray scale detail and resolution available in a pixel is preserved, with no smearing or blurring of pixels, independent of the content of adjacent pixels.

REFERENCES:
patent: 4295145 (1981-10-01), Latta
patent: 4314154 (1982-02-01), Minoura et al.
patent: 5018808 (1991-05-01), Meyers et al.

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