| 摘要 |
A scanner which optically scans n positions, where n>=2, has m light sources which emits p beams, where 1<=m<n and p<=1; a unit which splits each beam into q beams in a sub-scanning direction and forms each beam into a predetermined form, where 2<=q<=n; a deflector having a plurality of planes around a rotation axis and configured to deflect a number of beams equal to (q.m.p) from the m sources which are incident on the deflector; n optical systems which guide n sets of beams deflected to corresponding positions to form light spots; and a selecting unit which selects a path for each of the n sets of beams, wherein the deflector is at least a part of the selecting unit.
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