Canon fax basic 2000 Manuale Di Servizio

READING SECTION

3–12

3.2.1 Multi-chip type

The radiated light emitted from the LED array is reflected by the docu-

ment, and passes through the rod lens array to be received by the photo-

transistor array.

Fig. 3-13   Multi-chip Type (cross-section view)

The sensor circuit board has a built-in driver circuit for amplifying the out-

put of the received light, and the output of that driver circuit is converted to

serial data to be transmitted to the system controller.

Fig. 3-14   Multi-chip Type

Reflected light

Reading surface

Radiated light

Document feed direction

Guide mylar sheet

LED circuit board

LED array
(light-emitting section)

Contact glass

Rod lens array

Sensor circuit board

Photo-transistor array
(light-receiving section)

Sensor

driv

er1

Sensor

driv

er2

Analog/ser

ial

output

Reading

star

t signals

Sensor

driv

er3

Sensor

driv

er4

Cloc

k signal

Sensor

dr

ive

voltage

Document

Reflected

light

Sensor

Control

circuit