| 摘要 |
In a light scanning system, a semiconductor laser outputs a laser beam which diverges with a beam divergence angle. A condensing/scanning optical system condenses the laser beam and causes the laser beam to scan a predetermined surface-to-be-scanned. The distance between the beam waist of the laser beam and the surface-to-be-scanned as measured in the direction of the optical axis of the condensing/scanning optical system is set larger as the beam divergence angle of the laser beam as emitted from the semiconductor laser increases so that the beam diameter of the laser beam on the surface-to-be-scanned is constant irrespective of the beam divergence angle of the laser beam as emitted from the semiconductor laser.
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