The Charge Coupled Device (CCD) has been widely used in full page scanner applications for many years. Since the length of a CCD is about one inch, a concave reduction lens is requred to focus the image ofa standard A4 size page of8.5 inches width on the CCD. This results in a bulky assembly. Moreover, the whole assembly needs to be moved by a high power stepping motor, which suffers from a non-smooth movement causing distortion in the image.A contact type image sensor (CIS) module is designed to solve the aforementioned problem. The dimensions of an A4 size CIS module is only 18 x 18 x 224 mm. The module has all the elements required to capture an image. These are: ( 1) a hybrid image sensor board (which consists ofa linear silicon butted image sensor array, an operational amplifier, and passive components); (2) an LED light source; (3) a one to one selfoc lens; (4) a cover glass and (5) an aluminum case to house all of the above components. The hybrid image sensor board is fabricated by butting many silicon image sensor chips end-to-end on top ofa ceramic substrate to achieve the desired length.Since the image sensor chip is silicon, the module can be operated at high clock rates with low noise characteristics. A resolution of200 and 400 dots per inch (dpi) are designed and developed for facsimile and scanner applications. The CIS device description, operation and performance will be presented in this paper.

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