Ricoh PRIPORT VT 2000 Series Service Manual page 41

28 February '91
2.4 CCD (Charge Coupled Device)
RS2
18
OS2
20
OS
2
RS1
5
OS1
3
CCD (16 dots/mm)
Light
Energy
Photo
Diode
This is a solid-state device similar to a photodiode array, but unlike a photo-
diode array, a CCD can read one complete scan line at a time. The CCD
produces an analog signal which is converted into a digital signal for image
processing.
φ1C φ1B
OD
19 17
6
22
φ2C
RS
Shift
Electrode
Shift Register
Storage
Electrde
φ1E
21
13
Shift Registor
Shift Gate
D D D D
31 S1 S2
18 19 20
Shift Gate
Shift Registor
4 10
φ2B φ10 φ20
φ1E, φ2E Clock (Phase 1)
φ10, φ20 Clock (Phase 2)
01B : Final Clock (Phase 1)
02B : Final Clock (Phase 2)
SH : Shift Gate
RS : Reset Gate
OS : Output Transistor source
OD : Output Transistor Drain
SS : Sub-straight (Ground)
IS : Input Source (Test Pin)
IG : Input Gate (Test Pin)
2-14
φ2E
14
D D D D
32 33 34 35
9 15
1 8
SS SS SS
IS
7
SH
12
IG
16