About CIS (contact image sensor)
CIS (contact image sensor) is the key part for kinds of little-body electrograph and printer and others image sensor solution. It transforms the paper image into the electronic image. It is widely used for fax machines, optical flatbed scanners and portable applications (e.g. portable scanner), bar code reader and optical identification technology industry.
Syscan CIS are outstanding in high scanning speed, multi-light source and are ideal for special industry use like financial instruments, Lottery Machine and so on.


Structure and Function:
CIS (contact image sensor) has been intensively used in fax machines for scanning document image and converting it into electronic signals. A CIS comprises a housing, a LED array, a scanning face glass, a lens, and a circuit board. The light source of LED array emits light through the glass onto document. Document reflects light onto the lens permitting it to be further transmitted to the circuit board causing it to produce a series of electronic signals for output.

Application:
Fax machines, optical flatbed scanners and portable applications (e.g. portable scanner), bar code reader and optical identification technology industry.

Advantages:
It can save a lot of time and efforts in assembly and maintenance because a CIS contact sensor is modularized. All the necessary optical elements, such as mirrors, light source and a photoelectric converting device, are included in a compact module. Thus, a CIS module can help to simplify the inner structure of a scanner. Moreover, a CIS contact sensor is smaller and lighter than a CCD line sensor. With a CIS contact sensor, the scanner can be portable with height around 30 mm.


Disadvantage:
The scene depth of a CIS contact sensor is only about 0.3 mm. Based on the structure of a conventional flatbed scanner, it is very difficult to assure a document sheet in focus. Even a small manufacture error or structure distortion will affect the picture quality of the images.

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