Patent ID: 6856439
Filing Date: 2005-02-15
Classification: G02B

Abstract:
1. A tandem-type laser scanning apparatus comprising: a deflector for deflecting a first laser beam and a second laser beam in a main scanning direction by reflecting the laser beams simultaneously with a single surface, the first and second laser beams fulfilling the following conditions: where α represents an angle that a principal ray of the first laser beam makes with a main scanning plane when the first laser beam is incident on the deflector; and β represents an angle that a principal ray of the second laser beam makes with the main scanning plane when the second laser beam is incident on the deflector; and a scanning optical system for directing the deflected first and second laser beams to separate scanned surfaces corresponding thereto in such a way that the scanned surfaces are individually scanned with the laser beams focused thereon; wherein the scanning optical system includes: