Long linear image sensor photosensor array

An a-Si H photosensor array has been successively applied to a long linear image sensor and high-performance area image sensor. A photodiode in which a-Si H is sandwiched between ITO and metal electrodes is used because of its short photoresponse time. In this structure, blocking contacts at both electrodes are necessary to prevent carrier injection from the electrodes. 

A contact linear image sensor can make the equipment compact, because it does not require a high-magnification lens system. The sensor unit consists of an illuminator, a compact optical guide, and the long linear photosensor array, which is, for example, 210 mm long for the iso-A4... 

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