Photosensor actuating device

Claim 2

A photosensor driving system used for sequentially driving a plurality of photosensitive elements disposed in an array with output lines thereof forming a common output line connected to a common load resistor, the system comprising a plurality of pulse output lines each operationally coupled to each of said photosensitive elements, and pulse means for initially providing all of said pulse output lines with a pulse signal having a duration only sufficient to erase electric charges stored in said photosensitive elements and for providing after a predetermined period for storage of electric charges each of said photosensitive elements in a sequential order with a pulse signal having a duration only sufficient to read out optical information stored in respective ones of said photosensitive elements.

Claim 3

A photosensor driving system according to claim 1, wherein there is further included means which are operationally coupled to the common output line of said photosensitive elements for producing a short pulse to bring the potential of said output line to zero in synchronization with the start of said pulse for erasing electric charge.

Claim 4

A photosensor driving system according to claim 1, wherein said pulse means comprises a clock pulse generating circuit, a start pulse generating circuit having an input selectively connectable with said clock pulse generating circuit, an electric charge erasing time setting circuit connected to an output of said start pulse generating circuit and providing an output, an electric charge storing time setting circuit having an input connected to the output of said electric charge erasing time setting circuit and providing an output, a gate circuit having inputs connected to said clock pulse generating circuit and said electric charge storing time setting circuit and providing an output, a pulse width setting circuit having inputs connected to said gate circuit and said start pulse generating circuit, counter means having inputs connected to the pulse width setting circuit and said start pulse generating circuit, a sequential pulse generating circuit having inputs connected to said counter means, said pulse width setting circuit and said electric charge erasing time setting circuit and providing an output, and a set-reset circuit having inputs connected to set start pulse generating circuit and set counter means and an output connected to an input of said gate circuit.