2JN
2-1-7
(2) Image scanner unit (ISU)
The image scanner unit consists of an exposure lamp, four mirrors, a lens, a CCD PWB, and so on. Also an inverter PWB
for driving the exposure lamp and a home position sensor for detecting the home position of the image scanner unit are
incorporated.
The original on the contact glass is exposed to the light of the exposure lamp that is reflected by the ISU reflector. The
image is input through reflection by the four mirrors and through the ISU lens to the CCD image sensor on the CCD PWB.
The CCD image sensor scans one row of the image in the main scan direction, converts it to electric signals, and outputs
them to the control PWB. Then the image scanner unit is moved in the sub scan direction along the sliding rod, and the
CCD image sensor scans the next row of the image in the main scan direction. The operation described above is repeated
for scanning the overall image of the original. If a document processor (DP) is used, the image scanner unit stops at the
position of the DP contact glass and scans sequentially one row of the image on the original in synchronization with the
moving timing of the original in the sub scan direction by driving the DP.
Figure 2-1-11Image scanner unit (ISU)
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(1) Lamp mount
(2) ISU housing
(3) ISU reflector
(4) Exposure lamp
(5) Mirror A
(6) Mirror B
(7) Mirror C
(8) Mirror D
(9) ISU lens
(10) CCD PWB
(11) Inverter PWB
(12) Home position sensor
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