Patent US4297586A successfully refreshed from Google Patents.
US4297586A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photo-electric digital circuit for monitoring strip loop position
Assignee: Individual
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Filing: 1980-02-25
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Granted: 1981-10-27
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Expires: 2000-02-25
Abstract
Abstract Apparatus for monitoring strip loop position, having a plurality of light sources and a corresponding plurality of photo-detectors spaced from each other in the strip loop reservoir on opposite sides of the strip loop path; each photo-detector is connected to the input of a corresponding photocell amplifier which is normally biased to be driven to positive or negative saturation as a function of the input voltage applied to the photocell amplifier. The outputs of all the photocell amplifiers are coupled together through a summing junction to the input of an output amplifier for amplifying the voltage and current signals appearing at the summing junction. Display and/or control means are coupled to the output of the output amplifier.
Inventors
- 👤 John M. Rodgers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:47
CPC Classifications
G; G01; G01P; G01P13/00; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/342
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
161 words
Apparatus for monitoring strip loop position in a strip loop reservoir comprising: a plurality of light sources and a corresponding plurality of photo-detectors spaced from each other on opposite sides of the strip loop path in the strip loop reservoir; a plurality of first amplifying means, each said first amplifying means having its input coupled to a corresponding photo-detector, said first amplifying means being normally biased to be driven substantially to positive or negative saturation as a function of the input voltage applied to said first amplifying means through said corresponding photo-detector, the outputs of said plurality of first amplifying means being coupled together at a summing junction; second amplifying means having its input coupled to the summing junction for amplifying the voltage and current signals appearing at said summing junction; and means coupled to the output of said second amplifying means for remotely visually monitoring the strip loop position as a function of the output of said second amplifying means.
Claim 2
Dependent Claim
161 words
Apparatus for monitoring strip loop position in a strip loop reservoir comprising: a plurality of light sources and a corresponding plurality of photo-detectors spaced from each other on opposite sides of the strip loop path in the strip loop reservoir; a plurality of first amplifying means, each said first amplifying means having its input coupled to a corresponding photo-detector, said first amplifying means being normally biased to be driven substantially to positive or negative saturation as a function of the input voltage applied to said first amplifying means through said corresponding photo-detector, the outputs of said plurality of first amplifying means being coupled together at a summing junction; second amplifying means having its input coupled to the summing junction for amplifying the voltage and current signals appearing at said summing junction; and means coupled to the output of said second amplifying means for remotely visually monitoring the strip loop position as a function of the output of said second amplifying means.
Claim 3
Dependent Claim
48 words
Apparatus according to claim 1, further comprising a plurality of further summing junctions, each comprising one of said photo-detectors and a resistive impedance coupled in series between opposite polarity voltage sources; wherein the inputs of said first amplifying means are coupled to respective ones of said summing junctions.
Claim 4
Dependent Claim
27 words
Apparatus according to claim 1 or 2, wherein each of said first amplifying means comprises an open loop operational amplifier biased to operate in its saturated region.
Claim 5
Dependent Claim
53 words
Apparatus according to claim 3, further comprising a plurality of photo emitting means, each coupled to the output of a corresponding first amplifying means for providing a visual indication of strip loop position and operational status of said first amplifying means as a function of the voltage output of said first amplifying means.
Claim 6
Dependent Claim
20 words
Apparatus according to claim 4, wherein said remote monitoring means comprises a center zeroing voltmeter and a center zeroing ammeter.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-10-26 | 1985-04-27 | 1985-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-26 | 1989-04-27 | 1989-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-26 | 1993-04-27 | 1993-10-27 | $7700.00 | Window Closed / Lapsed |