US3596162A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speed control system with comparison of a sawtooth wave with a reference level
Assignee: Sony Corp
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Filing: 1969-05-07
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Granted: 1971-07-27
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Expires: 1989-05-07
Abstract
Abstract A speed control system comprising means for producing a sawtooth wave signal of a frequency corresponding to a frequency-modulated signal relating to the revolution of a rotary member, means for controlling the revolving speed of the rotary member with the sawtooth wave signal and a circuit for changing the inclination of the sawtooth wave.
Inventors
- 👤 Jun Takayama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 18:18
CPC Classifications
H; H02; H02P; H02P7/00; H02P7/06; H02P7/18; H02P7/24; H02P7/28; H02P7/285; H02P7/288; H02P7/2885; Y; Y10; Y10S; Y10S388/00; Y10S388/907; Y10S388/915
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
176 words
A speed system for a rotary member comprising means for generating a sine wave signal that is frequency-modulated in accordance with the rotational speed of said rotary member, means for producing a sawtooth wave signal for each complete cycle of said frequency-modulated sine wave signal with the pitch of each said sawtooth wave signal, and hence the peak voltage thereof, corresponding to the period of the respective cycle of said frequency-modulated signal, means for comparing said peak voltage of each sawtooth wave signal with a reference voltage and for producing a comparison signal in response to said peak voltage being in excess of said reference voltage with said comparison signal corresponding to the extent of said excess, means responsive to said comparison signal for providing a corresponding control signal, means for exertIng a driving force on the rotary member in accordance with said control signal, and means for varying the inclination of said sawtooth wave signal and thereby determining the speed of the rotary member which is to be maintained in correspondence to said reference voltage.
Claim 2
Dependent Claim
176 words
A speed system for a rotary member comprising means for generating a sine wave signal that is frequency-modulated in accordance with the rotational speed of said rotary member, means for producing a sawtooth wave signal for each complete cycle of said frequency-modulated sine wave signal with the pitch of each said sawtooth wave signal, and hence the peak voltage thereof, corresponding to the period of the respective cycle of said frequency-modulated signal, means for comparing said peak voltage of each sawtooth wave signal with a reference voltage and for producing a comparison signal in response to said peak voltage being in excess of said reference voltage with said comparison signal corresponding to the extent of said excess, means responsive to said comparison signal for providing a corresponding control signal, means for exertIng a driving force on the rotary member in accordance with said control signal, and means for varying the inclination of said sawtooth wave signal and thereby determining the speed of the rotary member which is to be maintained in correspondence to said reference voltage.
Claim 3
Dependent Claim
16 words
A speed control system according to claim 10, wherein said rotary member is a DC motor.
Claim 4
Dependent Claim
15 words
A speed control system according to claim 1, wherein said rotary member is a capstan.
Claim 5
Dependent Claim
79 words
A speed control system according to claim 1, wherein said means for producing a sawtooth wave signal includes shaping circuit means shaping said frequency-modulated signal to provide a rectangular wave having a pitch corresponding to the period of said frequency-modulated sine wave, differentiating circuit means differentiating said rectangular wave to provide sets of differentiated pulses at the rise and fall, respectively, of said rectangular wave, and sawtooth wave generating means triggered by one of said sets of differentiated pulses.
Claim 6
Dependent Claim
37 words
A speed control system according to claim 1, wherein said means for providing the control signal further includes pulse width modulating circuit means providing a wave which is pulse width modulated in accordance with said comparison signal.
Claim 7
Dependent Claim
27 words
A speed control system according to claim 5, wherein said pulse width modulating circuit means provides said wave only when said comparison signal exceeds a predetermined level.
Claim 8
Dependent Claim
40 words
A speed control system according to claim 6, wherein said means for providing the control signal further includes integration circuit means integrating the pulse width modulated wave to provide said control signal in the form of a varying DC voltage.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-26 | 1975-01-25 | 1975-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-26 | 1979-01-25 | 1979-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-26 | 1983-01-25 | 1983-07-27 | $7700.00 | Window Closed / Lapsed |