Sony Semiconductor Solutions Corporation has commercialized the "IMX294CJK" Type 4/3 back-illuminated CMOS image sensor with approximately 10.71M-effective pixels for the expanding security camera market.
The "IMX294CJK" is the first in-house image sensor for security cameras to adopt the Type 4/3 format, and realizes output of the number of pixels needed for 4K at 120 frame/s (in ADC 10-bit output mode). In addition, use of a large-size pixel achieves SNR1s of 0.14 lx*1, and use of a Quad Bayer pixel structure (see Figure 1) realizes an HDR (High Dynamic Range) function with no time difference, enabling video imaging with a wide dynamic range.
*1: Low illuminance performance index advocated by Sony for image sensors for industrial applications
*2: Scalable Low Voltage Signaling Embedded Clock
* Exmor R is a trademark of Sony Corporation. The Exmor R is a Sony's CMOS image sensor with significantly enhanced imaging characteristics including sensitivity and low noise by changing fundamental structure of Exmor™ pixel adopted column parallel A/D converter to back-illuminated type.
* STARVIS is a trademark of Sony Corporation. The STARVIS is back-illuminated pixel technology used in CMOS image sensors for surveillance camera applications. It features a sensitivity of 2000 mV or more per 1 µm2 (color product, when imaging with a 706 cd/m2 light source, F5.6 in 1 s accumulation equivalent), and realizes high picture quality in the visible-light and near infrared light regions.
The IMX294CJK adopts Type 4/3 as the optical size, and supports various output formats (angle of view) including 10M (3704 × 2778) for aspect ratio 4:3, UHD (3840 × 2160) for 16:9, and 4096 × 2160 for 17:9. In addition, the A/D converter can be selected from 10 bits, 12 bits, and 14 bits according to the application (Table 3).
Exceptional low-illumination performance of SNR1s: 0.14 lx is realized by use of a large-size optical system and by expanding the area per pixel to 4.63 µm. This makes the IMX294CJK ideal for security camera market applications that require low-illumination performance (Photograph 2).
This product realizes high-speed movie imaging with a 4K angle of view at the high frame rate of 120 frame/s, and also enables high-speed imaging at 60 frame/s in HDR drive mode.
In addition, use of our proprietary high-speed serial interface SLVS-EC together with high-speed imaging enables image transfer with few signal lines. This product is also equipped with a general-purpose MIPI (CSI-2) interface, and supports connection with a general-purpose ISP (Image Signal Processor).
The IMX294CJK uses a Quad Bayer structure, and outputs data binned in 2 × 2 pixel units in normal mode. In HDR mode, integration can be divided into long-time integration and short-time integration for each 2 pixels in the Quad array (Figure 1). In this case there is no time difference between long-time integration and short-time integration, which realizes HDR with little blending offset when imaging moving subjects (Photograph 3).
*If the mouse cursor changes over the photo, you can click to see the larger version in a new window.
Condition: 0.2 lx F2.0 (Exposure time 33.3 ms, Internal gain 45 dB (HCG))
Condition: Exposure time (3.2 ms/0.2 ms) blended image
|Output image size||Diagonal 21.63 mm (Type 4/3) aspect ratio 17:9 & 4:3|
|Number of effective pixels||4168 (H) × 2176 (V) approx. 8.93M pixels (aspect ratio 17:9)
3792 (H) × 2824 (V) approx. 10.71M pixels (aspect ratio 4:3)
|Unit cell size||4.63 µm (H) × 4.63 µm (V)|
|Optical blacks||Horizontal||Front: 0 pixels, rear: 0 pixels|
|Vertical||Front: 16 pixels, rear: 0 pixels|
|Input drive frequency||72 MHz (SLVS-EC)
6 to 27 MHz (MIPI CSI-2)
|Output Interface||SLVS-EC (2.304 Gbps / Lane) Max. 8lane
MIPI CSI-2 (1.728 Gbps / Lane) Max. 4lane
|Supply voltage VDD (Typ.)||2.8 V / 1.8 V / 1.2 V|
|Sensitivity (F5.6)||Typ.||1900 mV||1/30s accumulation (HCG)|
|Saturation signal||Min.||970 mV||Tj = 60 °C (LCG)|
|Drive mode||Recommended number of recording pixels||Frame rate
|All-pixel scan (aspect ratio 4:3)||3704 (H) × 2778 (V)||24||14|
|All-pixel scan (aspect ratio 17:9)||4096 (H) × 2160 (V)||60 (SLVS-EC)
|All-pixel scan (aspect ratio 16:9)||3840 (H) × 2160 (V)||60 (CSI-2)||12|
|All-pixel scan (aspect ratio 4:3)||3704 (H) × 2778 (V)||60 (SLVS-EC)
|All-pixel scan (aspect ratio 17:9)
Horizontal/vertical 2/2-line binning
|2048 (H) × 1080 (V)||120 (SLVS-EC)
|All-pixel scan (aspect ratio 17:9)||4096 (H) × 2160 (V)||120 (SLVS-EC)
|HDR-1 (aspect ratio 17:9)||4096 (H) × 2160 (V)||60 (SLVS-EC)
|HDR-2 (aspect ratio 4:3)||3704 (H) × 2778 (V)||30 (SLVS-EC)
|HDR-3 (aspect ratio 17:9)
Horizontal/vertical 2/2-line binning
|2048 (H) × 1080 (V)||60||10|
*Sony Semiconductor Solutions Corporation reserves the right to change products and specifications without prior notice.
The IMX294CJK uses a large-size optical system, which makes it different from our conventional lineup, and we developed it as a road map for future high-end security cameras. This image sensor features exceptional low-illumination performance and is also equipped with an HDR function that provides good performance for moving subjects, making it suitable as a flagship model.
Please consider adopting the IMX294CJK Type 4/3 high-picture-quality CMOS image sensor.
Designers Mr. Isoo , Mr. Takamoto