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An optical scanner that performs scanning by deflecting plural light beams using a single deflector. The optical scanner includes plural pre-scanning optical systems configured to emit the plural light beams and each including a light source. A first of the pre-scanning optical systems emits a first

An optical scanner that performs scanning by deflecting plural light beams using a single deflector. The optical scanner includes plural pre-scanning optical systems configured to emit the plural light beams and each including a light source. A first of the pre-scanning optical systems emits a first of the light beams to be deflected by the deflecting unit. A second of the pre-scanning optical systems emits a second of the light beams and is disposed in the position different from a position of the first pre-scanning optical system in a rotational axis direction of the deflector.

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The invention claimed is: 1. An optical scanner that performs scanning by deflecting plural light beams using a single deflector, comprising: plural pre-scanning optical systems configured to emit the plural light beams, each pre-scanning optical system including a light source, wherein a first of

The invention claimed is: 1. An optical scanner that performs scanning by deflecting plural light beams using a single deflector, comprising: plural pre-scanning optical systems configured to emit the plural light beams, each pre-scanning optical system including a light source, wherein a first of the pre-scanning optical systems is configured to emit a first of the light beams to be deflected by the deflector, a second of the pre-scanning optical systems is configured to emit a second of the light beams and is disposed in a position different from a position of the first pre-scanning optical system in a rotational axis direction of the deflector, and the first and second pre-scanning optical systems are further configured to emit the first and second light beams parallel to each other. 2. The optical scanner as claimed in claim 1, wherein the first and second pre-scanning optical systems are plane symmetric. 3. The optical scanner as claimed in claim 2, further comprising: a floor wall between light paths of the first and second light beams; wherein the first and second pre-scanning optical systems excluding the light sources are disposed on the floor wall. 4. The optical scanner as claimed in claim 3, wherein the floor wall is connected and fixed to an optical housing which optical housing serves as a casing. 5. The optical scanner as claimed in claim 4, wherein the light source is press fitted in a fitting hole or a fitting groove as a light source attachment portion in the optical housing. 6. The optical scanner as claimed in claim 4, wherein each of the pre-scanning optical systems includes a collimator lens that is bonded by a light-curing adhesive to a collimator lens attachment portion in the floor wall after adjusting a position of the collimator lens in the collimator lens attachment portion. 7. The optical scanner as claimed in claim 4, wherein each of the pre-scanning optical systems includes a cylindrical lens that is bonded by a light-curing adhesive to a cylindrical lens attachment portion in the floor wall after adjusting a position of the cylindrical lens in the cylindrical lens attachment portion. 8. The optical scanner as claimed in claim 4, wherein each of the pre-scanning optical systems includes an aperture; and the aperture of the first pre-scanning optical system and the aperture of the second pre-scanning optical system have a unitary structure. 9. The optical scanner as claimed in claim 8, wherein the aperture is press fitted into an aperture attachment portion as a fitting groove in the floor wall. 10. The optical scanner as claimed in claim 4, wherein each of the pre-scanning optical systems includes an aperture integrally molded with the floor wall. 11. The optical scanner as claimed in claim 4, wherein the floor wall is fixed onto the optical housing by a reinforcing rib to maintain a relative position of the light sources with respect to the collimator lenses, the cylindrical lenses, and the apertures. 12. The optical scanner as claimed in claim 1, wherein the light source includes a multibeam light source that emits plural parallel laser beams. 13. An image forming apparatus comprising: the optical scanner of claim 1.