US3751671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opto-electronic relay
Assignee: Lignes Telegraphiques et Telephoniques LTT SA
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Filing: 1972-07-25
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Granted: 1973-08-07
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Expires: 1992-07-25
Abstract
Abstract An opto-electronic relay comprising an electroluminescent diode fed from unipolar or bipolar telegraph signals and a phototransistor converting the light radiated by the electroluminescent diode into relayed electric signals. Protection means are provided against overload of said diode by too strong input signals. Distortion correction means are also provided for improving the waveform of the relayed signals. The protection means include the series connection of a resistor with said diode and at least one silicon diode and a transistor shunting said diodes, while the distortion correction means include a series R.C. circuit shunting said electroluminescent and protection diodes.
Inventors
- 👤 M Maniere
- 👤 P Thepaut
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:19
CPC Classifications
H; H04; H04L; H04L25/00; H04L25/02; H04L25/20; H04L25/26
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
An opto-electronic relay comprising an electroluminescent diode, means for applying to said electroluminescent diode pulses representing information data, a protection diode shunting said electroluminescent diode and having its forward direction opposite that of the electroluminescent diode, at least a resistor serially connected with both said electroluminescent and protection diodes, a transistor shunting said diodes and having its emitter and base respectively connected to the two ends of said resistor, a phototransistor spaced from said electroluminescent diode to receive optical radiation therefrom and a direct current amplifier connected to said phototransistor.
Claim 2
Dependent Claim
90 words
An opto-electronic relay comprising an electroluminescent diode, means for applying to said electroluminescent diode pulses representing information data, a protection diode shunting said electroluminescent diode and having its forward direction opposite that of the electroluminescent diode, at least a resistor serially connected with both said electroluminescent and protection diodes, a transistor shunting said diodes and having its emitter and base respectively connected to the two ends of said resistor, a phototransistor spaced from said electroluminescent diode to receive optical radiation therefrom and a direct current amplifier connected to said phototransistor.
Claim 3
Dependent Claim
125 words
An opto-electronic relay comprising an electroluminescent diode, means for applying to said electroluminescent diode pulses representing information data, a protection diode shunting said electroluminescent diode and having its forward direction opposite that of the electroluminescent diode, at least a resistor serially connected with both said electroluminescent and protection diodes, a first transistor shunting said diodes and having its emitter and base respectively connected to the two ends of said resistor, a second transistor of conductivity type opposite that of the first transistor, a series circuit including a resistor, a capacitor and said second transistor shunting said electroluminescent and protection diodes and said first transistor, a phototransistor spaced from said electroluminescent diode to receive optical radiation therefrom and a direct current amplifier connected to said phototransistor.
Claim 4
Dependent Claim
125 words
An opto-electronic relay comprising an electroluminescent diode, means for applying to said electroluminescent diode pulses representing information data, a protection diode shunting said electroluminescent diode and having its forward direction opposite that of the electroluminescent diode, at least a resistor serially connected with both said electroluminescent and protection diodes, a first transistor shunting said diodes and having its emitter and base respectively connected to the two ends of said resistor, a second transistor of conductivity type opposite that of the first transistor, a series circuit including a resistor, a capacitor and said second transistor shunting said electroluminescent and protection diodes and said first transistor, a phototransistor spaced from said electroluminescent diode to receive optical radiation therefrom and a direct current amplifier connected to said phototransistor.
References Cited (Backward Citations)
US3371232A
Cited
US3483529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |