Patent ID: 6836280
Filing Date: 2004-12-28
Classification: B41J,G02B

Abstract:
In a laser scanning unit comprising a housing, a scanning assembly including a scanning device, a laser diode for generating a laser beam, a collimation assembly for substantially collimating said laser beam and a pre-scan structure comprising a pre-scan lens carrier including a pre-scan lens supported for movement relative to said housing, an alignment structure for aligning said pre-scan lens carrier comprising:a beam splitter located along the path of a laser beam originating from said laser diode and passing through said collimation assembly and said pre-scan lens, said beam splitter forming said laser beam into first and second beam portions; and first and second sensors for sensing a spot size of each of said first and second beam portions, a desired position for said pre-scan lens carrier is determined based on said spot sizes of said first and second beam portions.