Patent ID: 7079171
Filing Date: 2006-07-18
Classification: B41J,H04N

Abstract:
1. A color laser printer producing a color image using a single laser scanning unit, the color laser printer comprising: a lighting unit including first and second laser diodes emitting first beams having a first polarization, third and fourth laser diodes disposed in a different direction from the first and second laser diodes to emit second beams having a second polarization, and a polarization prism transmitting or reflecting the first and second beams depending on a direction of polarization to transmit the first and second beams along the same path; a rotary polygon mirror that reflects the first and second beams transmitted along the same path from the lighting unit; an f-θ lens that focuses the first and second beams reflected by the rotary polygon mirror; first and second polarization beam splitters, each of which transmits or reflects the first and second beams passing through the f-θ lens depending on the direction of the polarization; and first through fourth photoconductive units on which the first and second beams reflected and transmitted through the first and second polarization beam splitters are incident, wherein lengths of optical paths between the f-θ lens and each of the first through fourth photoconductive units are equal to one another.