Contact Image Sensor (CIS) Technology

CIS technology is widely adopted for high-precision imaging applications.

When scanning objects with a traditional CCD (Charge Coupled Device) linear image sensor, an external optical lens assembly is required, which may introduce image distortions such as pincushion distortion — especially when scanning large-format documents.

By contrast, CIS-based scanning delivers distortion-free imaging without such optical aberrations.

A Contact Image Sensor (CIS) is a compact imaging sensor widely used in flatbed scanners, operating in near-direct contact with the target object.

CCD, another common scanner sensor technology, relies on a system of mirrors to direct light toward a fixed sensing element.

CIS-enabled scanners are significantly more compact than CCD-based units, consume roughly one-tenth of the power, and are ideally suited for portable, low-power devices, often operating directly via USB power.

AOS Optics delivers professional, customized technical solutions for CIS-based systems.

We tailor optical and sensor-integrated designs to your application requirements, and fine-tune relevant parameters to ensure full compatibility with your system software.

CIS image sensors have gained extensive adoption thanks to their superior performance advantages.

Key application areas include:

Industrial measurement: ultrasonic level meters, automatic vacuum packaging machines, pressure sensors.

Financial equipment: currency counters, money exchangers, banknote validators, lottery identifiers.