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Image Sensors

SONY CMOS Image Sensors Overview - Polarized
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Sony Semiconductor Solutions has launched a polarization image sensor (polarization sensor): 3.45µm pixel size with four-directional polarizer which is formed on the photodiode of the image sensor chip. This polarization sensor is targeting the industrial equipment market.  In addition to capturing brightness and color, this image sensor can also capture polarization information that cannot be detected by a normal image sensor. This polarization sensor can be used in many applications in the industrial field, such as inspection when visibility and sensing are difficult.

CMOS - Polarized Image Sensors from SONY 

With conventional types of polarization sensors, the polarizer is attached on top of the on-chip lens layer (Fig.2), however with Sony Semiconductor Solutions’ polarization sensor the polarizer is formed on chip under the on-chip lens layer (Fig.3). A shorter distance between the polarizer and the photodiode improves the extinction ratio*5 and the incident angle dependence. 


Since the polarizer is formed during the semiconductor process, form and formulation of polarizer, uniformity, mass productivity and durability are excellent compared to conventional polarization sensors. Furthermore, Sony Semiconductor Solutions’ Polarization sensor is covered with an anti-reflection layer which helps to reduce reflectance and avoids poor flare and ghost characteristics.

Device Structure
Image Sensor Characteristics
Basic Drive Mode

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SONY Technology Guide

For directional polarizer is formed on the image sensor

 

Sony Semiconductor Solutions’ polarization sensor can capture a four directional polarization image in one shot by the four directional polarizer (Fig.1). It can calculate the direction and degree of polarization (DoP) based on the intensity of each directional polarization. Together with subsequent signal processing, it can capture the polarization information in real time.

Polarizer is formed on chip under the on-chip lens layer​

With conventional types of polarization sensors, the polarizer is attached on top of the on-chip lens layer (Fig.2), however with Sony Semiconductor Solutions’ polarization sensor the polarizer is formed on chip under the on-chip lens layer (Fig.3). A shorter distance between the polarizer and the photodiode improves the extinction ratio*5 and the incident angle dependence. 
Since the polarizer is formed during the semiconductor process, form and formulation of polarizer, uniformity, mass productivity and durability are excellent compared to conventional polarization sensors. Furthermore, Sony Semiconductor Solutions’ Polarization sensor is covered with an anti-reflection layer which helps to reduce reflectance and avoids poor flare and ghost characteristics.

Global Shutter Function​

Industrial applications require imaging of fast-moving objects. However, existing CMOS image sensors are unable to accurately identify fast-moving objects, due to the focal plane distortion, which is caused by the rolling shutter function. The IMX250MZR/MYR, IMX253MZR/MYR address this issue by providing an analog memory inside each pixel and realizing the global shutter function to enable high-picture-quality without focal plane distortion.

High Frame Rate​

The column-parallel A/D conversion technology of Sony's CMOS image sensors is used to realize high-speed imaging of up to 163.4frame/s (ADC 8 bit) for the IMX250MZR/MYR, 68.3frame/s (ADC 8 bit) for the IMX253MZR/MYR. Increasing processing speed for industrial applications.


ROI mode and trigger mode

The IMX250MZR/MYR, IMX253MZR/MYR are equipped with variety of functions necessary for industrial applications, such as ROI Mode and Trigger Mode. ROI Mode crops required areas, and up to 8 × 8 = 64 locations can be set with IMX250MZR/MYR. In addition to setting the 8 × 8 = 64 locations, IMX250MZR/MYR provides greater freedom for specifying regions and allows overlap of specified regions. Various exposure methods are provided for trigger mode, which controls the exposure time using an external pulse.

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