The scanning mirror is a
The laser beams from No. 1 reflection mirror are arranged to be parallel beams by the curved mirror and passed to No. 3 reflection mirror. The laser beams reflected by No. 3 reflection mirror are passed through No. 2 cylinder lens to the photoconductor drum.
No. 2 cylinder lens corrects deflection of laser beams due to varia- tions in the duplex scanning mirror installing angle, and leads the stable laser beams for each line to the photoconductor drum.
Part name | Function |
|
|
Laser diode | The laser power is controlled by the |
| APC (Auto Power Control) circuit. In |
| addition, the paper empty sensor is |
| provided. |
| The laser diode radiates 780nm infrared |
| semiconductor laser beams under |
| control of the laser control PWB. |
|
|
Collimator lens | The collimator lens arranges laser |
| beams radiated from the laser diode to |
| be parallel beams and converges them |
| on the photoconductor drum. |
|
|
No. 1 cylindrical lens | Adjusts the direction of the laser beams. |
|
|
Scanning motor/ | Used to rotate the scanning mirror. |
Scanning mirror | Started by the drive signal (PMD_) from |
| the PCU. The RPM is controlled by the |
| clock signal (PMCLK_). The motor RPM |
| is 11811 RPM. |
|
|
| The scanning mirror is |
| mirror, and it reflects laser beams. By |
| this operation, 6 lines of printing is made |
| for one rotation of the scanning motor. |
|
|
No. 1 mirror | This mirror reflects laser beams to the |
| curved mirror. |
|
|
Laser beam sensor | Used to detect laser beams to make |
PWB (Start position | horizontal synchronization. |
detection PWB) | The photo sensor on the PWB detects |
| laser beams to generate SYNC signal. |
|
|
No. 2 mirror (Curved | Laser beams are scanned by the |
mirror) | scanning mirror. But the dot interval of |
| laser beams radiated onto the |
| photoconductor differs at the center and |
| at the corners. This mirror corrects this |
| difference to provide even dot interval of |
| laser beams. For this reason, it is of |
| curved structure. |
|
|
No. 3 mirror | This mirror passes the laser beams |
| reflected from the curved mirror to the |
| photoconductor mirror. |
|
|
No. 2 cylindrical lens | This lens is used to correct laser beam |
| deflection due to variations in the |
| scanning mirror angle. |
|
|
D. Image process section
(1) Outline
This section is composed of the photoconductor section, the develop- ing section, the transfer/separation section. Images formed by laser beams formed by the scanner (Writing) section are converted into a latent electrostatic images, which are formed into visible images by toner development. The toner images are transferred onto paper.
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