| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical scanner capable of easily emitting a light beam to each pixel in an exposure target area of the light beam even if there is no light-emitting timing table.SOLUTION: An optical scanner comprises: a light scanning part 1 that oscillates a reflecting mirror around each axis of first and second axes perpendicular to each other and is formed in a manner capable of applying Lissajous scanning to the light beam within an exposure target area; a phase detection part 2 for detecting an oscillation phase around each axis; a light source part 3 for emitting the light beam to the reflecting mirror; a scan control part 4 for driving the light scanning part 1 by setting oscillation cycles Tand Taround each axis and changing scan amplitude around the second axis for each half cycle of the oscillation cycle Taround the second axis by a fixed amount, so that a scanning line pair S and S, which are approximately parallel to each other in a scanning direction around the first axis, are present on a Lissajous scan trajectory in the half cycle of T; and a light source control part 5 for exposing only a phase section corresponding at the time of scanning the scanning line pair S and S to the light beam from the light source part 3, on the basis of the oscillation phase detected by the phase detection part 2. |
