Controlling The Scanner Motor; Controlling The Motor When Scanning An Image - Canon iR5000i Service Manual

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2.2 Controlling the Scanner Motor

The system used to control the scanner motor is constructed as follows:

The motor driver turns on/off the scanner motor and controls its direction and speed of

rotation in keeping with the signals from the CPU, IPC, and speed control circuit.

Reader controller PCB

When scanning an image, the motor is controlled as follows, thereby controlling the

movement of the No. 1 mirror base unit:

Stream reading position

(start position)

[1] Acceleration. Used to accelerate until the speed most appropriate to the read ratio is

[2] Approach run. Used to ensure that speed stabilizes.

[3] Image read. Used to read the image at a specific speed suited to the read ratio.

[4] Deceleration. Used to enable the scanner to speed down and stop promptly, starting at

the end of the image.

Speed control

Image leading edge

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CANON iR5000i/iR6000i REV.0 JUNE 2001

CHAPTER 2 ORIGINAL EXPOSURE SYSTEM

Travel distance

Scanner motor

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Ir6000i Image reader-a1