| 摘要 |
A composite light source unit including a plurality of semiconductor lasers disposed in a housing, a plurality of collimator optical systems for converting the laser beams to parallel laser beams, respectively, and a combining optical system for combining all the laser beams except one as a group of laser beams having close, parallel optical axes, respectively, extending in a direction different from the direction of said one laser beam, whereby said one laser beam and the group of laser beams are emitted from the housing in different directions. Alternatively, the combining optical system combines the laser beams as a group of laser beams having close, parallel optical axes, respectively, and emits the group of laser beams out of the housing, one of the laser beams emitted out of the housing having a different optical property than that of the other laser beams. Said one laser beam can easily be separated from the other laser beams, and will be used as a synchronizing beam in a scanning device.
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