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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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ILX146K |
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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) |
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Device Structure |
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Figure 1 shows the ILX146K block diagram
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 provides
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 readout
charge is transferred to individual horizontal
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 monochrome
(green) CCD, the ILX146K can
support high-speed black-and-white
scanning of documents and wide range of
signal processing. |
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Suppression of Incorrect Color
Registration During Scanning |
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Mechanical motion is required for document
scanning using a CCD linear sensor.
When spatial read errors (variations
in the read position) in the scan direction
occur during this mechanical motion,
color registration errors occur. Since conventional
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 influence
of spatial errors during scanning,
color displacement is suppressed and it
can support high-quality high-speed scanning. |
High-Speed Transfer
Maximum Data Rates:
100 MHz (Monochrome),
150 MHz (Color) |
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Figure 3 shows the structure of the monochrome
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 horizontal
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 registers
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 maximum
transfer rate of 25 MHz. This allows
the ILX146K to achieve a maximum data
rate of 100 MHz. |
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•••• Ms. INOKUCHI••••
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The ILX146K adopts a CCD transfer
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. |
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See
all articles with figures and tables.  |
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Vol.41 |
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