US3885206A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase control system for rotary means
Assignee: Sony Corp
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Filing: 1973-12-12
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Granted: 1975-05-20
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Expires: 1993-12-12
Abstract
Abstract A phase control system for a rotary member is provided which has a device for adjusting the rotation of a rotary member so as to make the rotational speed and rotary phase of the rotary member coincident for a reference frequency signal. The phase control system has a rotational speed control function to lock the rotary phase of the rotary member at the reference frequency signal without especially providing a device which makes the rotational speed of the rotary member coincident with the reference frequency signal.
Inventors
- 👤 Takeshi Hort
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:04
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
217 words
A phase control system for a rotary member comprising: reference signal generating means for generating a reference signal representing a predetermined rotary phase relationship for said rotary member; position signal generating means disposed to sense when said rotary member rotates to predetermined angular positions and to generate first and second position signals in response thereto; square-wave signal generating means for generating a square-wave signal which has a predetermined phase relation with respect to the first position signal generated by said position signal generating means; comparator means for comparing the second position signal generated by said position signal generating means with the square-wave signal, said comparator means exhibiting a first condition when the second position signal is in phase leading relationship with respect to said square-wave signal, a second condition when the second position signal is in phase lagging relationship with respect to said square-wave signal, and a third condition when the second position signal is in a predetermined phase range with respect to said square-wave signal; and control signal generating means for generating a control signal to control the rotation of said rotary member in accordance with the phase relationship between said reference signal and at least one of said first and second position signals and further in accordance with the condition exhibited by said comparator means.
Claim 2
Dependent Claim
217 words
A phase control system for a rotary member comprising: reference signal generating means for generating a reference signal representing a predetermined rotary phase relationship for said rotary member; position signal generating means disposed to sense when said rotary member rotates to predetermined angular positions and to generate first and second position signals in response thereto; square-wave signal generating means for generating a square-wave signal which has a predetermined phase relation with respect to the first position signal generated by said position signal generating means; comparator means for comparing the second position signal generated by said position signal generating means with the square-wave signal, said comparator means exhibiting a first condition when the second position signal is in phase leading relationship with respect to said square-wave signal, a second condition when the second position signal is in phase lagging relationship with respect to said square-wave signal, and a third condition when the second position signal is in a predetermined phase range with respect to said square-wave signal; and control signal generating means for generating a control signal to control the rotation of said rotary member in accordance with the phase relationship between said reference signal and at least one of said first and second position signals and further in accordance with the condition exhibited by said comparator means.
Claim 3
Dependent Claim
36 words
A phase control system according to claim 1 further comprising braking means for controlling the rotation of said rotary member, said braking means being controlled by said control signal generated by said control signal generating means.
Claim 4
Dependent Claim
35 words
A phase control systEm according to claim 1 in which said rotary member is rotated by a motor, said motor being controlled in phase by the control signal generated by said control signal generating means.
Claim 5
Dependent Claim
86 words
A phase control system according to claim 1 wherein said square-wave signal generating means comprises first monostable multivibrator means responsive to the first position signal for producing a first square-wave signal having a frequency equal to the frequency of the first position signal and having a first predetermined pulse width; and second monostable multivibrator means responsive to said first square-wave signal for producing a second square-wave signal having a frequency equal to the frequency of the first position signal and having a second predetermined pulse width.
Claim 6
Dependent Claim
121 words
A phase control system in accordance with claim 4 wherein said comparator means comprises first sampling means responsive to said first square-wave signal and the second position signal for producing a first output signal when said second position signal coincides with said first predetermined pulse witdth and for producing a second output signal when said second position signal does not coincide with said first predetermined pulse width; and second sampling means responsive to said second square-wave signal and the second position signal for producing a third output signal when said second position signal coincides with said second predetermined pulse width and for producing a fourth output signal when said second position signal does not coincide with said second predetermined pulse width.
Claim 7
Dependent Claim
111 words
A phase control system according to claim 5 wherein said control signal generating means comprises coincidence means responsive to said reference signal and said first, second, third and fourth output signals to generate a periodic signal having a frequency equal to the frequency of said reference signal when said second and third output signals coincide, a first level signal when said first and fourth output signals coincide, and a second level signal when said second and fourth output signals coincide; and further sampling means coupled to said coincidence means and said position signal generating means for sampling the signals generated by said coincidence means with said first and second position signals.
Claim 8
Dependent Claim
96 words
A phase control system according to claim 6 wherein said control signal generating means further comprises integrating means coupled to said coincidence means for producing a signal proportional to the time integral of said signals generated by said coincidence means, the signal produced by said integrating means having a limiting value; and wherein said further sampling means comprises a sample-and-hold circuit coupled to said integrating means for sampling the signal produced by said integrating means at sample times established by said first and second position signals and for storing the sampled signal between successive sampling times.
Claim 9
Dependent Claim
52 words
A phase control system according to claim 7 wherein said position signal generating means comprises first and second magnetic pick-up means spaced apart by a predetermined angular amount and positioned proximate the rotary member for sensing the passage of a magnetic element carried by the rotary member as said rotary member rotates.
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) | 1978-05-19 | 1978-11-18 | 1979-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-19 | 1982-11-18 | 1983-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-19 | 1986-11-18 | 1987-05-20 | $7700.00 | Window Closed / Lapsed |