Radiant energy – Photocells; circuits and apparatus – Photocell controlled circuit
Patent
1996-11-25
1998-11-17
Le, Que
Radiant energy
Photocells; circuits and apparatus
Photocell controlled circuit
2502141, 250551, 257433, H01J 4014
Patent
active
058379959
ABSTRACT:
A wavelength-portion controllable optoelectronic switch ("Opsistor") capable of rapid switch frequencies fabricated as a monolithic integrated circuit is disclosed. The Opsistor is comprised of two inverse parallel photodiodes in close proximity, preferably on a monolithic silicon substrate, such that the anode of one photodiode is electrically connected via a first conductor to the cathode of the second photodiode, and the cathode of the first photodiode is electrically connected via a second conductor to the anode of the second photodiode. The voltage-phase of the Opsistor is determined by the relative illumination to the Opsistor's two photodiodes and is rapidly switchable. As a receiving device for data signals, the Opsistor receives programming signals from a transmitter light source. By using different wavelength-portion bandwidth pass filters on each of the two Opsistor photodiodes, a OPS-F device is created, and by using a two-wavelength transmitter light source designated as TM2, a TM2/OPS-F system is created capable of high data transmission rates, and high resistance to signal noise. Applications suitable for the Opsistor and TM2/OPS-F system include high speed optocouplers, linear optical position sensors, edge and target detection sensors, image recognition sensors, the basic subunits of optically based state computers, and high resolution optical encoders.
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Chow Alan Y.
Chow Vincent Y.
Chow Alan Y.
Le Que
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