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What are Contact Image Sensors (CIS)?
Contact Image Sensors (CIS) are a type of image sensor used in optical technology to capture digital images. Unlike traditional image sensors, which are based on charge-coupled devices (CCD) or complementary metal-oxide-semiconductor (CMOS) sensors, CIS technology directly scans the image by coming into physical contact with the object being scanned.
CIS devices consist of an array of light-sensitive elements, also known as pixels or photosites, arranged in a linear pattern. These sensors are typically integrated into devices such as document scanners, fax machines, and even handheld scanning devices.
How do Contact Image Sensors Work?
When a document or object is placed in contact with a CIS module, it emits light from a light source, typically an LED (light-emitting diode). The light interacts with the object’s surface, and the reflected light is captured by the array of light-sensitive elements.
Each photosite within the CIS array captures the intensity of light at a specific point on the object’s surface, converting it into an electrical charge. These electrical charges are then converted into digital data that forms a digital representation of the object or document being scanned.
CIS technology offers several advantages over older scanning technologies. It is generally more compact, energy-efficient, and cost-effective. Due to their compact size, CIS sensors are widely used in portable and space-constrained scanning devices. Additionally, CIS scanners typically have a faster scanning speed, making them suitable for high-speed document scanning applications.
Conclusion
In summary, Contact Image Sensors (CIS) are image sensors used in optical technology to capture digital images. They directly scan an object by physical contact and convert the reflected light into digital data. CIS technology is known for its compact size, energy efficiency, and cost-effectiveness, making it widely adopted in various scanning devices.
Please note that this explanation simplifies the concept for easy understanding, and there may be additional technical aspects and variations in different CIS implementations.
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