Patent ID: 7773314
Filing Date: 2010-08-10
Classification: G02B

Abstract:
1. A laser pre-scan assembly, comprising: a first laser diode for emitting a first laser beam having a first beam center axis and a second laser diode for emitting a second laser beam having a second beam center axis, said first beam center axis and said second beam center axis being separated from one another by a first distance in a process direction; a first collimation assembly comprising a first collimation lens having a first optical axis and causing said first laser beam to converge in a scan direction and in the process direction; a second collimation assembly comprising a second collimation lens having a second optical axis and causing said second laser beam to converge in the scan direction and in the process direction, said first optical axis being separated from said second optical axis by a second distance in the process direction; and a pre-scan lens configured to further converge said first laser beam and said second laser beam in the process direction and direct said first and second laser beams onto or near a common point on a surface of a scanner mirror, wherein said first collimation lens and said second collimation lens are positioned relative to said first laser diode and said second laser diode such that said first distance is greater than said second distance so that said first collimation lens directs said first laser beam inwardly in the process direction toward said pre-scan lens and said second collimation lens directs said second laser beam inwardly in the process direction toward said pre-scan lens; wherein a distance in a focus direction between said first laser diode and said first collimation lens is greater than a distance defined by a focal length of said first collimation lens and a distance in the focus direction between said second laser diode and said second collimation lens is greater than a distance defined by a focal length of said second collimation lens.