Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1993-04-05
1995-06-13
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
340555, G01V 904
Patent
active
054245320
ABSTRACT:
Pulse formers (14) driving respective LEDs (12) are energized by the cells of a shift register (16) which is docked by a clock line (CK), and to whose first cell an initial pulse is applied by a first signal generator (GR). A barrier-end Line (FB) is connected to the output of the shift register and to the input of the first signal generator. The latter resets the shift register cells through a reset line (RS). A plurality of photodiodes (42) facing the LEDs are connected in common to a bus line (BUS) through resistors (47) and electronic switches (44) which are dosed in turn by the cells of a shift register (46) similarly controlled by a second signal generator (GE) in synchronism with the first. The bus line is connected across a voltage supply through resistors (61, 63) and provides a multi-level signal to an evaluator circuit (VAL). The two shift registers, including the associated LEDs or photodiodes, may form blocks connected in cascade.
REFERENCES:
patent: 3970846 (1976-07-01), Schofield et al.
patent: 4749853 (1988-06-01), Salim
patent: 5130532 (1992-07-01), Clemens
patent: 5146081 (1992-09-01), Heikkinen et al.
patent: 5243183 (1993-09-01), Barron, Jr. et al.
patent: 5300768 (1994-04-01), Wakikaido et al.
Mirandola Francesco
Occheto Sergio
Josif Albert
Lee John R.
Modiano Guido
Nelms David C.
REER S.p.A.
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