Scanning apparatus

Details Scanning apparatus Scanning apparatus

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 7/10 (2006.01) H04N 1/12 (2006.01)

Patent

CA 1297712

SCANNING APPARATUS ABSTRACT A scanner including a source of coherent or substantially coherent light, a radial hologon, a f.THETA. lens and a target. Between the light source and the hologon there are means for forming light 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. Prismatic means 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. This allows the shape, orientation and size of the beam on the hologon to be optimum for duty cycle of the hologon and for spot size on the target. The prismatic means allows the spot shape and orientation on target to be optimized. The prismatic means tends to introduce undesirable bow into the scan line, therefore the wavelength of the light and the grating factor Image of the hologon are selected to produce an approximately equivalent opposite bow.

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