Static information storage and retrieval – Radiant energy – Electroluminescent and photoconductive
Patent
1979-01-17
1981-11-10
Hecker, Stuart N.
Static information storage and retrieval
Radiant energy
Electroluminescent and photoconductive
365215, 250205, G11C 1308
Patent
active
043002110
ABSTRACT:
A bistable circuit comprises a light-emitting diode connected in series with a phototransistor and so disposed as to illuminate the latter. When current is flowing--i.e. when the phototransistor conducts--light from the LED keeps the phototransistor conductive, and the circuit can be switched to the non-conductive (OFF) state by interrupting the light path between the LED and the phototransistor. When the circuit is OFF it can be switched to the ON state by external light.
A data-storage device embodying such bistable circuits is also disclosed; a rotatable disc carries a plurality of such circuits at regular spacings adjacent its periphery, and several setting devices at different positions are each operable to illuminate one of the circuits passing the setting device to switch that circuit to the ON state. After passing the several setting devices, each circuit is carried past a sensing device which detects whether the circuit is ON (by detecting whether light is being emitted from the circuit) and thereafter past a stationary shutter so placed as to interrupt the light path of the circuit and hence reset any circuit which is ON to the OFF state.
REFERENCES:
patent: 2742631 (1956-04-01), Rajchman et al.
patent: 3274389 (1966-09-01), Schmermund
patent: 4157481 (1979-06-01), Walton
Fujiwara et al., Photointerrupters, National Technical Report, vol. 22, No. 1, pp. 41-51, 2/76.
Rice et al., ELPC Direct Readin Memory Drum, IBM Tech. Disc. Bul., vol. 3, No. 8, 1/61, pp. 55-56.
Anacker et al., Beam-Operated Memory Cells, IBM Tech. Disc. Bul., vol. 9, No. 6, 11/66, pp. 737-738.
Astrahan, EL-PC Keyboard, IBM Tech. Disc. Bul., vol. 13, No. 3, 8/60, pp. 65-66.
Hecker Stuart N.
Molins Limited
Smith, Jr. John C.
LandOfFree
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