| 摘要 |
A laser beam scanner for scanning primary colors of red, green and blue laser beams on the same scanning plane (P1) includes three sets of a laser light source (104R, 104G, 104B), an acousto-optic modulator (108), an adjustable mirror (110) corresponding to the primary colors, and a polygon mirror (120), an f&thetas; lens (121), and a pair of mirrors (124, 126). One of the mirrors (126) serves as a beam splitter for splitting the laser beams into a first way for introducing the laser beams to the scanning plane (P1) and the second way for introducing a position sensor (201) disposed on a plane (P2) optically conjugated with the scanning plane (P1). The adjustable mirrors (110) are adjusted in a manner so that the red and blue laser beams are to be overlapped on the green laser beam by monitoring the positions of laser beams displayed on a monitor display (204a) sensed by the position sensor (201) . <IMAGE> |
