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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.
I I 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 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.
High-Speed Transfer Maximum Data Rates: 100 MHz (Monochrome), 150 MHz (Color)
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 m x 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.
Suppression of Incorrect Color Registration During Scanning
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.
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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.
H1-M H2-M 44 43 HDG-M 45 HH3-M 46 HH2-M 54 HH1-M 53 CHG2 4 CHG-M 3 ROG-M 52 H2 28 H1 27 VOUT-RE 50 VOUT-RO 49
Output circuit Output circuit Driver
VDD GND VL GND H1-M H2-M LH-M RS-M 48 39 47 51 42 41 40 29
Output circuit Output circuit Output circuit Output circuit
CCD register (G-3)
Driver
37 VOUT-G3 36 VOUT-G1 21 VOUT-G4 22 VOUT-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 H2 55 H1
CCD register (R-EVEN) CCD register (R-ODD) ROG/CHG Sensor (R) Sensor (G) Sensor (B) ROG/CHG CCD register (G-ODD) CCD register (G-EVEN)
Driver Driver Driver Driver Driver Driver
24 ROG 33 V1 32 V2 31 CHG 25 HH1 26 HH2 18 HH3 17 HDG
Color RGB adjacent 3-line linear sensor
VOUT-GO 6 VOUT-GE 7 VOUT-BO 8 VOUT-BE 9
Output circuit Output circuit Output circuit Output circuit
CCD register (B-ODD)
Driver
CCD register (B-EVEN)
Driver
1 12 14 13 RS LH H1 H2
20 11 19 35 VDD GND VL GND
16 15 H1 H2
I Figure 1 Block Diagram I 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 x 4) 9.325 m (H) x 9.325 m (V) (9.325 m 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
I Figure 2 Vertical Transfer Block Structure (Color RGB adjacent 3-line CCD)
I Table 2 Electrooptical Characteristics
Ta = 25C, VDD = 10 V, VL = -3 V, fRS = 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)
I Figure 3 Vertical Transfer Block Structure (Monochrome CCD)

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