No.

Name

No.

Name

1

Polygon Mirror

4

1st mirror

2

Lens 1

5

Dust Prevention Glass

3

Lens 2

-

-

The operation of the LD unit is synchronized with the paper feed timing. The laser beams fire through the cylindrical lens (where the beams are corrected), onto the facets of the polygon mirror (main scan writing), through lens 1 and lens 2, onto the 1st mirror, and finally through the dust protector glass onto the drum below.

  • The polygon mirror motor is the single motor that rotates the polygon mirror with 6 reflecting facets around its edge.
  • Each facet on the edge of the rotating polygon mirror reflects 40 beams simultaneously onto the photo conductive surface of the drum.

  • The speed of rotation of the polygon mirror motor for the models listed in the table below is the same for OHP transparency, thick paper, and normal paper.

    Model

    rpm

    RICOH Pro 8200S

    29156

    RICOH Pro 8210S/8210Y

    29528

    RICOH Pro 8220S/8220Y

    30236