What is the difference between CCD and CIS scanners (printer)?
What's the difference between both imaging systems?
Large format scanners use one of two imaging systems – CCD stands for Charge Coupled Device and CIS stands for Contact Image Sensor
What is CDD in scanners?
A CCD is the same type of imaging sensor found inside a digital camera. CCD uses an actual lens to reduce the full image onto the imaging sensor. This method is great for capturing very high resolution details along with widened color space.
Advantages
Deep Focal range (long working distance). Narrow width can be scanned at ultra-high resolution (however,reduction-lens is expensive).
Disadvantages
Limitation on downsizing because of the necessity of reduction optical path. Optical distortion occurs at the reduction-lens. Divided/splitted scanning might be required for a wide scanning width to avoid the optical distortion of the reduction-lens. In this case, multiple sensor units (lens + CCD) are necessary. CCD element requires high power consumption due to its multiple drive power supplies. Mechanical alignment is required.
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What is CIS in scanners?
A CIS is an integrated module that comprises an illumination system, an optical system and a light-sensing system – all within a single compact component.
Advantages
Small, thin and light-weight. Wide-format scanning, such as A0 size is also easy. No optical distortion due to life-size magnification scanning. Low power consumption (due to single low voltage operation of CMOS sensor). Low power consumption of light-source (contact scanning has less illumination leakage).
Disadvantages
Shallow focus depth (limited working distance).
CIS technology is less expensive than the traditional CCD models, but there can be some trade-offs regarding image quality, especially when scanning aerial photos or maps. Since there are no cameras to calibrate and the sensors are controlled by software, there is much less maintenance with a CIS-based system.
"Both CIS and CCD technologies have their merits, but it is a matter of application regarding which process suits your situation. "
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