IMAGE SENSOR

摘要

An image sensor for a tightly-coupled document reader in a facsimile transmitter has a plurality of mutually parallel columns (11,12) of sensors (31,32) to form rows of sensors at right angles to the columns. The rows have respective common electrodes (4) and terminals (5). A switch is provided for cyclically switching between the columns (11,12) while switches enable selective connection to an output of a single non-defective sensor in each row so that a scanned document portion can give rise to a signal in each row even when some of the sensors are defective. Alternatively all the columns may have a common first electrode and the sensors may have respective second electrodes to enable selective connection to outputs.