US3913022A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integrator control circuit
Assignee: AFP ACQUISITION Corp
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Filing: 1974-07-01
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Granted: 1975-10-14
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Expires: 1994-07-01
Abstract
Abstract A control circuit, for automatically controlling chemical replenishment in a chemical-containing automatic film processor, includes an integrator circuit which receives signals related to the image density in a sheet of image bearing material being transported through the processor. The signal currents are integrated for a predetermined time interval, and upon elapse of said predetermined time interval a reference current source having a polarity opposite to that of the signal current is coupled to the input of the integrator to reduce the output of the integrator toward a reference level. A circuit is provided for generating a control signal which effects replenishment throughout the time period required to reduce the output of the integrator to the reference level.
Inventors
- 👤 Minoru Kinoshita
- 👤 Osami Taniuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 23:07
CPC Classifications
H; H03; H03K; H03K7/00; H03K7/08; G; G03; G03D; G03D3/00; G03D3/02; G03D3/06; G03D3/065
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
156 words
An integrator control circuit comprising signal integrator means, means coupling a signal to be integrated to the input of said integrator means, a reference source having a polarity opposite to that of said signal, timer means operative, upon elapse of a predetermined time interval subsequent to commencement of said signal integration, for connecting said reference source to the input of said integrator means to reduce the output of said integrator means toward a reference level, and means for generating a control signal during the time period between the elapse of said predetermined time interval and the subsequent reduction of said integrator means output to said reference level, whereby the duration of said control signal is dependent upon the output level of said integrator means when said predetermined time interval elapses, and is also dependent upon the magnitude of any signal present at the input of said integrator means subsequent to elapse of said predetermined time interval.
Claim 2
Dependent Claim
156 words
An integrator control circuit comprising signal integrator means, means coupling a signal to be integrated to the input of said integrator means, a reference source having a polarity opposite to that of said signal, timer means operative, upon elapse of a predetermined time interval subsequent to commencement of said signal integration, for connecting said reference source to the input of said integrator means to reduce the output of said integrator means toward a reference level, and means for generating a control signal during the time period between the elapse of said predetermined time interval and the subsequent reduction of said integrator means output to said reference level, whereby the duration of said control signal is dependent upon the output level of said integrator means when said predetermined time interval elapses, and is also dependent upon the magnitude of any signal present at the input of said integrator means subsequent to elapse of said predetermined time interval.
Claim 3
Dependent Claim
28 words
The circuit of claim 1 including control means responsive to the coupling of said signal to the input of said integrator means for rendering said integrator means operative.
Claim 4
Dependent Claim
47 words
The circuit of claim 2 wherein said integrator means includes an integrating capacitor, said control means including a shorting switch connected across said capacitor, and signal detector means responsive to the presence of said signal at the input of said integrator means for opening said shorting switch.
Claim 5
Dependent Claim
44 words
The control circuit of claim 1 including control means jointly responsive to the absence of said signal at the input of said integrator means and to the presence of said reference level at the output of said integrator for rendering said integrator means inoperative.
Claim 6
Dependent Claim
98 words
The control circuit of claim 4 wherein said integrator means including an integrating capacitor, said control means comprising a first level detector having its input connected to the input of said integrator means, a second level detector having its input connected to the output of said integrator means, an OR circuit having inputs connected to the outputs of said first and second level detectors, and a relay connected to the output of said OR circuit, said relay including a pair of contacts connected across said integrating capacitor for selectively shorting said capacitor to render said integrator means inoperative.
Claim 7
Dependent Claim
68 words
The control circuit of claim 1 including means responsive to the presence of a signal in excess of said reference level at the output of said integrator means for activating said timer means, and a control relay coupled to the output of said timer means operative, upon elapse of said predetermined time interval, to close a circuit connecting said referenCe source to the input of said integrator means.
Claim 8
Dependent Claim
32 words
The control circuit of claim 6 wherein said control means is further operative, upon elapse of said predetermined time interval, to close a further circuit operative to initiate an external control function.
References Cited (Backward Citations)
US3419784A
Cited
US3593010A
Cited
US3654560A
Cited
US3818204A
Cited
US3862408A
Cited
US3836791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-13 | 1979-04-14 | 1979-10-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-13 | 1983-04-14 | 1983-10-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-13 | 1987-04-14 | 1987-10-14 | $7700.00 | Window Closed / Lapsed |