Photosensitive device read by charge transfer

Details Photosensitive device read by charge transfer Photosensitive device read by charge transfer

1981-02-05

1984-02-07

Murray, Richard

Facsimile and static presentation processing

Facsimile

Recording apparatus

H04N 314

Patent

active

044306725

ABSTRACT:
This device incorporates a photosensitive (1) constituted by a matrix of photosensitive points. Each photosensitive point has a charge reading diode D.sub.1. Metallic connections (C.sub.1 to C.sub.4) connect the reading diodes of the same column to a single diode (D.sub.2), followed by a grid G.sub.2 raised to a constant potential (V.sub.2). The operation of the device involves the repetition of two stages, i.e. stage T.sub.1 and stage T.sub.2. During stage T.sub.1 parasitic charges, due for example to too intense illumination, are transferred from diodes D.sub.1 to diodes D.sub.2 and are removed by a diode (D.sub.5). During stage T.sub.2 the signal charges stored by the points of one line of the matrix are transferred into a memory and then into a charge transfer read register (R.sub.2). The register reads these charges during the following stages T.sub.1 and T.sub.2 until the time when the register receives the charges corresponding to the reading of the following line.

REFERENCES:
patent: 4335405 (1982-06-01), Sakane et al.
IEEE Journal of Solid State Circuits, vol. SC-14, No. 3, Jun. 1979, (N.Y.), R. Koch: "Charge-injection device with CCD readout", pp. 604-608.

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