Patent US3363875A successfully refreshed from Google Patents.
Patent US3689157A successfully refreshed from Google Patents.
US3689157A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring the relative movement between an object and the environment of the object
Assignee: INST MIKROVAGSTEKNIK
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Filing: 1969-11-26
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Granted: 1972-09-05
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Expires: 1989-11-26
Abstract
Abstract A device for measuring the relative movement between an object and the environment of the object comprises a signal source, two scanning devices, arranged to generate two signals derived from a signal from the signal source, a delay device and a comparison circuit connected to the two scanning devices, one through the delay device on the input side and to a control circuit on the output side. The control circuit is arranged to control some part of the device with a control signal so that the two signals tend to coincide. Further the device has a correction circuit, the input side of which is connected to speed sensing means, which is independent of the control circuit, and the output side of which is connected to the control circuit. The correction circuit is arranged to influence the control circuit so that the control signal, at least at velocities near zero, has a limited variation range around a value corresponding to the speed indicated by the independent speed sensing means.
Inventors
- 👤 Ingvar Andermo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:08
CPC Classifications
G; G01; G01P; G01P3/00; G01P3/64; G01P3/80; G01P3/806
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
232 words
A device for measuring the relative movement of an object with respect to its environment comprising a signal source for generating a primary signal, two scanning devices, displaced from each other by a predetermined distance along the direction of motion of the object, for generating two similar signals derived from said primary signal, said two similar signals being time displaced as a function of the displacement between said scanning devices and the relative velocity of the movement, a two-input comparison circuit having an output for generating a signal related to the difference in the signals received at the two inputs, means for connecting one of said scanning devices to one of the inputs of said comparison circuits, delay means for connecting the other of said scanning devices to the other input of said comparison circuit, velocity indicating means connected to the output of said comparison cIrcuit, control means having an input connected to the output of said comparison circuit and having an output for transmitting a control signal to said delay means for constraining the signals received at the inputs of said comparison circuit toward equality, an independent speed sensing means and an output connected to said control means for limiting the value of the control signal transmitted by said control means to a limited range of values about a value related to a speed sensed by said independent speed sensing means.
Claim 2
Independent Claim
232 words
A device for measuring the relative movement of an object with respect to its environment comprising a signal source for generating a primary signal, two scanning devices, displaced from each other by a predetermined distance along the direction of motion of the object, for generating two similar signals derived from said primary signal, said two similar signals being time displaced as a function of the displacement between said scanning devices and the relative velocity of the movement, a two-input comparison circuit having an output for generating a signal related to the difference in the signals received at the two inputs, means for connecting one of said scanning devices to one of the inputs of said comparison circuits, delay means for connecting the other of said scanning devices to the other input of said comparison circuit, velocity indicating means connected to the output of said comparison cIrcuit, control means having an input connected to the output of said comparison circuit and having an output for transmitting a control signal to said delay means for constraining the signals received at the inputs of said comparison circuit toward equality, an independent speed sensing means and an output connected to said control means for limiting the value of the control signal transmitted by said control means to a limited range of values about a value related to a speed sensed by said independent speed sensing means.
Claim 3
Dependent Claim
55 words
A device according to claim 1 wherein said independent speed sensing means includes said one of said scanning devices, and a frequency analyzing means connected in series therewith for transmitting a signal which is proportional to the frequency of the signals from said one scanning device at least for frequencies less than a predetermined frequency.
Claim 4
Dependent Claim
71 words
A device according to claim 1 wherein said control means comprises an integrating circuit and said correction means comprises a two-input signal subtracting circuit, one of the inputs being connected to the output of said integrating circuit, the other of the inputs being connected to said independent speed sensing means, and a unidirection signal conducting device connecting the output of said signal subtraction circuit to the input of said integrating circuit.
Claim 5
Dependent Claim
26 words
A device according to claim 3 wherein a voltage-limiting circuit connects the output of said integrating circuit to said one input of said signal subtraction circuit.
Claim 6
Dependent Claim
80 words
A device according to claim 1 wherein said control means comprises an integrating circuit having an input for receiving signals from said comparison circuit and an output, a two-input signal adder circuit having an input connected to the output of said integrating circuit, a second input connected to said independent speed sensing means and an output, and an analog-to-frequency converter having an input connected to the output of said signal adder circuit and an output for transmitting the control signal.
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) | 1975-09-05 | 1976-03-06 | 1976-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-05 | 1980-03-06 | 1980-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-05 | 1984-03-06 | 1984-09-05 | $7700.00 | Window Closed / Lapsed |