Hologon deflector system having dispersive optical elements for scan line bow correction, wavelength shift correction and scanning spot ellipticity correction
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United States of America Patent
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Nov 16, 1999
Issued Date -
N/A
app pub date -
Sep 4, 1990
filing date -
Dec 1, 1988
priority date (Note) -
Expired
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Abstract
Bow can be minimized by an auxiliary grating in a post deflection path of the diffracted beam from the hologon which is disposed in non-parallel relationship to the plane of rotation of the hologon. The ellipticity of the spot which generates the scan line and intensity variation in the scan beam can be minimized by using a dispersive element, preferably a prism, between the hologon and the bow compensation grating with its dispersion in a direction opposite to the direction of the dispersion of the hologon and of the auxiliary grating. Another grating before the hologon can be used to correct for wavelength shift induced cross-scan error associated with the dispersion in the hologon and a bow compensation grating following the hologon. A hologon deflector system may incorporate two identical prism elements of essentially the same shape and which are supported on the same body so that scan beam tracking errors associated with movement (vibration) of one of the prisms is compensated by the movement or vibration of the other.
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