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Tuesday, December 19, 2017
Sony Releases a Back-Illuminated Time-of-Flight Image Sensor


Sony has released a back-illuminated, time-of-flight (ToF) image sensor which is 1/2-type, VGA resolution and it delivers improved depth sensing performance.

The company will start shipping sample units in April 2018.
The new sensor is part of Sony's DepthSense lineup, a group of depth-sensing image sensor products with range finding capability, and it is the first product in the lineup to adopt a back-illuminated ToF configuration.

Compact sensors that can provide accurate depth maps are used for various applications such as gesture recognition, object recognition, and obstacle detection, as well as for robotics and drones that require autonomous operations, or virtual reality, augmented reality and mixed reality systems. The small size of the new product was achieved thanks to development of a 10µm square pixel, with highly accurate distance measurement performance from close to far distances, which can be used in a wide range of applications in these fields.

With ToF technology, the distance to an object is measured by the time it takes for light from a light source to reach the object and reflect back to the sensor. ToF image sensors detect distance information for every pixel, resulting in highly accurate depth maps. To further improve accuracy from near to far distances, reflected light must be efficiently received and the signal processing must be executed at a high frame rate.

Sony says that the new sensor which adopts back-illuminated CMOS image sensor architecture allows for more accurate detection of the reflected light because of improved sensor sensitivity. While conventional ToF sensor has difficulty in measuring far distance of approximately 10 meters, the new product comes with a sensitivity raising mode, enabling distance measurement with a high rate of detection at these distances. It is also possible to capture high-precision depth maps in a VGA resolution at close distances of approximately 30 centimeters to 1 meter.

Additionally, because this sensor captures depth maps for each frame, it enables image capture at a higher frame rate than when using a laser to scan the object for distance measurement. This reduces distortion of moving subjects in depth maps.

Sony will offer a software development kit with the sample shipments to make camera development easier.

Model name IMX456QL
Number of effective pixels 640 (H) X 480 (V), 0.307 megapixels
Image size Diagonal 8.0mm (Type 1/2)
Recommended light source wavelength 850nm/940nm
Pixel size 10µmx10µm
Modulation frequency 5~100MHz
Modulation Contrast 0.8
Depth sensing frame rate 120fps
Distance precision at 1 m 6mm


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