Image recording sensor

Details Image recording sensor Image recording sensor

1987-10-15

1989-01-10

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

35821327, H01J 4014

Patent

active

047975628

ABSTRACT:
The invention relates to an image recording sensor (1) with a plurality of photodetectors (15) in a matrix arrangement. The photodetectors (15) are here integrated components of cells (2), which through address lines (PX, PY) can be coupled for the definition of cell addresses. Each cell has at least one capacitor (C1, C2), in which the photocharge of the photodetector (15) can be stored. The resulting capacitor voltage (U1) is compared in a comparator (17) with a reference voltage (U.sub.REF, U2). The comparator is succeeded by an output circuit (18) for the output of a signal to the address lines upon the occurrence of a positive comparison result. All cells (2) can be driven via an external control circuit (4) with groups of common control and check signals. With such image recording sensor (1) no intensity values per picture element are output but only the addresses of the picture elements of interest, in which the intensity value has exceeded a given level, i.e., the intensity equivalent of the reference voltage (U.sub.REF, U2).

REFERENCES:
patent: 4505574 (1985-03-01), Kurata et al.
patent: 4638354 (1987-01-01), Denimal

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