| 摘要 |
The optical structure is for correcting aberration generated when laser beam is scanned. The optical structure includes a colimator (2) for adjusting laser beam emitting angle, a focus lenz (3) for condensing laser beam passed through the colimator (2), a rotating polyhedral glass (4) for reflecting the condensed laser beam, and a correction lenz unit including a hologram plate (10) and a convex lenz (6) to focus a laser beam an a drum.
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