Mirror Carriage Drive Mechanism - Oki MC860 Maintenance Manual

Oki Data CONFIDENTIAL

2.3.2.3 Mirror carriage drive mechanism

<Carriage A>
• Scanner performs the function of irradiating the lamp light uniformly over a document
while moving its position, and also of inputting the reflected light to the mirror carriage
B via the mirror A. The mirror carriage A is driven by the two timing belts which are
driven by the FBS motor.
Scanner moves at the scan speed corresponding to the respective magnification
ratios that are set with reference to the standard scanning speed.
• Home position of the mirror carriage A is the position where the home sensor is
located. The home sensor position is the reference position of the scanning operation.
<Carriage B>
• The mirrors B and C are fixed to the holder with the relative angle of 90 degrees. The
reflected light from the mirror A is input to the CCD device via the mirrors B and C,
and lens.
• The mirror carriage B is driven by the FBS motor using a timing belt and pulley. The
light path length between the document and the lens is maintained to a constant
value as the mirror carriage B moves at a half speed of the mirror carriage A.
43967002TH Rev.1
5
4
3
2
1
13
1 APS sensor
2 BIS sensor
3 Carriage B
4 BSS sensor (beam sensor)
5 FBS motor
6 Inverter
7 Lens
2. Theory of Operation
6
7
8
9
10
11
12
8 CCD PCB
9 Carriage A
10 Lamp
11 Mirror A
12 Home sensor
13 Mirror B, Mirror C
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