Multiple resolution flying spot raster scanner with rotatable aperture
AssigneeXerox Corporation
InventorsEllis D. Harris, Kevin J. Garcia
Life of this patent
Estimating the term…
Abstract
A rotatable aperture is positioned between the pre-polygon cross-scan cylindrical optical element and the rotating polygon mirror of a laser diode flying spot raster scanner optical system. Rotating the aperture about a line parallel to the axis in the scan plane adjusts the cross-scan resolution of the imaged spot size along the scan line of the raster output scanner optical system.
Claims9
A flying spot raster output scanning optical system for adjusting the resolution of a scan beam along the scan line comprising:
- a laser diode source which emits a coherent light beam,
- collimating means for collimating said emitted light beam,
- first optical means for converging the cross-scan portion of said collimated beam,
- a rotatable aperture for selectively blocking said light beam from said first optical beam,
- means for rotating said rotatable aperture,
- a rotating polygon mirror with a plurality of facets for reflecting said beam from said rotatable aperture
- second optical means for converging the scan and cross-scan portions of the reflected beam to form a scan beam along said scan line, whereby said rotatable aperture adjusts the resolution of said scan beam along said scan line.
The flying spot raster output scanning optical system for adjusting the resolution of a scan beam along the scan line of claim I wherein said rotatable aperture has a rotational symmetry about said line parallel to the axis in the scan plane of said flying spot raster output scanning optical system.
Dependencies are inferred from the claim text.