Scanning apparatus and support

Details Scanning apparatus and support Scanning apparatus and support

G - Physics

02

B

88/96

G02B 26/10 (2006.01) G02B 13/00 (2006.01) G02B 13/10 (2006.01) G02B 27/00 (2006.01) G06K 15/12 (2006.01) H04N 1/036 (2006.01) H04N 1/12 (2006.01)

Patent

CA 1297713

ABSTRACT A scanner including a source of coherent or substantially coherent radiation, a radial hologon, a f.THETA. lens and a target. Between the light source and the hologon there are means for forming radiation from the source into a collimated beam having an oblong cross-sectional shape and for directing the beam onto the hologon at a predetermined incident angle and with the long axis of the oblong cross-sectional shape of the beam radial of the axis of rotation of the hologon. Two prisms are provided between the hologon and the lens means for so modifying the cross-sectional shape of the beam that the spot at the target station has a selected shape and orientation. The prisms are mounted in an articulated mount having adjustment means, which allows rotation of the prisms so as to correct both bow in the scan line and incorrect placement of the scan line on the target. Such bow and incorrect placement could be created by a change of the wavelength of the radiation and by the pitch of the grating lines of the hologon being different to nominal.

533796

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