The Industry’s First Digital Copier CCD Linear Sensor
with RGB Adjacent 3-Line Plus Monochrome 1-Line 7600-Pixel Sensors
ILX146K
At the same time as demand for digitizing documents is increasing, there
is also rapid progress being made in switching from analog to digital in
copiers. The increasing performance in this area is remarkable.
Due to this background, there is now strong demand for CCDs that can
provide the performance to scan documents with high quality at even
faster speeds.
To respond to these needs, Sony has now developed the ILX146K CCD
linear sensor in which the RGB sensor lines are directly adjacent to each
other.
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Color RGB adjacent 3-line CCD +
monochrome (green) CCD
High-speed transfer
Maximum data rates:
100 MHz (monochrome)
150 MHz (color)
Device Structure
Figure 1 shows the ILX146K block dia-
gram and figure 2 shows the structure of
the vertical transfer block of the color
RGB adjacent 3-line CCD.
The color RGB adjacent 3-line sensor pro-
vides a vertical transfer gate adjacent to
the blue sensor and reads out the charge
collected at the green sensor. By carefully
controlling the drive timing of the read
gate and the vertical transfer gate, the read-
out charge is transferred to individual hori-
zontal registers without any mixing of the
blue and green charge. This allowed Sony
to create an adjacent RGB sensor and
made the following two features possible.
Since the ILX146K also provides a mono-
chrome (green) CCD, the ILX146K can
support high-speed black-and-white
scanning of documents and wide range of
signal processing.
High-Speed Transfer
Maximum Data Rates:
100 MHz (Monochrome),
150 MHz (Color)
Figure 3 shows the structure of the mono-
chrome CCD vertical transfer block.
While the color RGB adjacent 3-line CCD
has a 2-stage horizontal register structure
for each color, the monochrome CCD
adopts a 4-stage structure in the horizon-
tal registers for even faster processing.
Sony applied further refinements to the
color CCD vertical transfer structure, to
allow the signal charge to be divided
among 4 horizontal registers. The signal
charge transferred by the horizontal reg-
isters is transferred a maximum distance
of 7 cm (9.325
µm ×
7,500 pixels) to the
charge to voltage conversion block. Each
of these horizontal registers has a maxi-
mum transfer rate of 25 MHz. This allows
the ILX146K to achieve a maximum data
rate of 100 MHz.
Suppression of Incorrect Color
Registration During Scanning
Mechanical motion is required for docu-
ment scanning using a CCD linear sen-
sor. When spatial read errors (variations
in the read position) in the scan direction
occur during this mechanical motion,
color registration errors occur. Since con-
ventional CCD linear sensors have a wide
spacing between the RGB sensors, the
possibility for read errors to occur is high,
especially during high-speed scanning.
Since the ILX146K, in which the RGB
sensors are adjacent, is resistant to the in-
fluence of spatial errors during scanning,
color displacement is suppressed and it
can support high-quality high-speed scan-
ning.
V
O
I
C
E
The ILX146K adopts a CCD trans-
fer structure that differs from
conventional sensors. We came
up with a lot of new ideas, for
example, in the drive timing, and
as a result were able to create a
CCD linear sensor that features
the 3 RGB lines being adjacent,
which was previously unknown.
This device is optimal for copiers
and other scanner-based end
products that need to operate at
high speed. I strongly recommend
that you consider this device.
φH1-
M
φH2-
M
44 43
φHDG-
M
45
φHH3-
M
46
φHH2-
M
54
φHH1-
M
53
φCHG2
4
φCHG-
M
3
φROG-
M
52
φH2
28
φH1
27
V
OUT-RE
50
V
OUT-RO
49
Output
circuit
Output
circuit
Driver
V
DD
GND V
L
GND
φH1-
M
φH2-
M
φLH-
M
φRS-
M
48 39 47 51
42 41 40 29
Output
circuit
Output
circuit
Output
circuit
Output
circuit
CCD register (G-3)
Driver
37 V
OUT-G3
36 V
OUT-G1
21 V
OUT-G4
22 V
OUT-G2
CCD register (G-1)
Driver
CCD register (G-4)
Driver
Driver
Driver
Driver
CCD register (G-2)
ROG/CHG/CHG2
Sensor (G-
M
)
Monochrome green sensor
56
φH2
55
φH1
CCD register (R-E
VEN
)
CCD register (R-O
DD
)
ROG/CHG
Sensor (R)
Sensor (G)
Sensor (B)
ROG/CHG
CCD register (G-O
DD
)
CCD register (G-E
VEN
)
Driver
Driver
Driver
Driver
Driver
Driver
24
φROG
33
φV1
32
φV2
31
φCHG
25
φHH1
26
φHH2
18
φHH3
17
φHDG
Color RGB adjacent
3-line linear sensor
V
OUT-GO
6
V
OUT-GE
7
V
OUT-BO
8
V
OUT-BE
9
Output
circuit
Output
circuit
Output
circuit
Output
circuit
CCD register (B-O
DD
)
Driver
CCD register (B-E
VEN
)
Driver
1 12 14 13
φRS φLH φH1 φH2
20 11 19 35
V
DD
GND V
L
GND
16 15
φH1 φH2
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Figure 1 Block Diagram
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Table 1 Device Structure
Horizontal register
Horizontal register
Read gate
Sensor
(Red)
Sensor
(Green)
Vertical transfer
gate
Sensor
(Blue)
Sensor
(Red)
Sensor
(Green)
Sensor
(Blue)
Sensor
(Red)
Sensor
(Green)
Sensor
(Blue)
Sensor
(Red)
Sensor
(Green)
Sensor
(Blue)
Sensor
(Red)
Sensor
(Green)
Sensor
(Blue)
Item
Number of effective
pixels
Pixel size
Sensor structure
Number of outputs
Supply voltage
Resolution
Package
Vertical
register
ILX146K
30,400 pixels (7,600 pixels
×
4)
9.325
µm
(H)
×
9.325
µm
(V)
(9.325
µm
pitch)
3 adjacent RGB lines + 1 G line
10 outputs
(2 outputs each for the color RGB lines)
(4 green outputs for the monochrome line)
Dual power supply: 10 V and -3 V
600 DPI (A3)
56-pin DIP (Cer-DIP)
Read gate
Horizontal register
Horizontal register
Horizontal register
Horizontal register
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Figure 2 Vertical Transfer Block Structure (Color RGB adjacent
3-line CCD)
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Table 2 Electrooptical Characteristics
Ta = 25°C, V
DD
= 10 V, V
L
= –3 V, fφ
RS
= 25 MHz, input clock = 5 Vp-p,
light source = 3200K, using a CM-500S (t = 1.0 mm) IR cut filter.
Typ.
Unit
Item
10
R
15
G
V/(lx · s)
Sensitivity
7.5
B
14.5
Monochrome
%
10
Sensitivity nonuniformity
%
10
Adjacent pixel difference
V
1.2 (Min.)
Saturated output voltage
mV
0.4
Dark voltage average
mV
1.0
Dark signal nonuniformity
%
0.1
Image lag
mA
125
Current consumption
50
Maximum operating R, G, B
MHz/color
frequency
100
Monochrome
Horizontal register
Vertical
register
Horizontal register
Horizontal register
Horizontal register
Read gate
Green sensor (monochrome)
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Figure 3 Vertical Transfer Block Structure (Monochrome CCD)
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