Optical scan pattern generating arrangement for a laser scanner.

摘要

An optical arrangement (14) in a laser scanner (10) for generating a cross bar X laser light beam scan pattern includes a multi-faceted or -mirrored optical device (36) mounted for rotation about a vertical axis (50). The device (36) has four primary mirrors (38A - D) oriented ninety degrees from one to the next about the vertical axis (50). The primary mirrors (38A - D) are tilted about respective horizontal axes relative to the vertical axis (50) and adapted to receive and reflect a laser light beam as each primary mirror moves successively through a portion of each rotational cycle of the optical device (36). The optical arrangement (14) also includes a multiplicity of secondary mirrors (44-48) disposed in stationary positions relative to one another and to each of the primary mirrors (38A - D) as they move successively through the rotational cycle portion. The secondary mirrors (44-48) are adapted to receive the laser light beam reflected from the primary mirrors (138A - D) and to reflect the same to trace scan lines of the laser light beam scan pattern at different orientations with respect to one another as the primary mirrors (38A - D) move successively through the portion of each rotational cycle.