US4605884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control unit
Assignee: Canon Inc
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Filing: 1985-02-01
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Granted: 1986-08-12
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Expires: 2005-02-01
Abstract
Abstract A control unit for a movable member comprises a motor for driving the movable member, a speed detector for detecting a rotating speed of the motor, a reference signal generator, amplifiers of different gains for amplifying a signal representing a phase difference between a speed signal from the speed detector and a reference signal from the reference signal generator, a selector for selecting one of the outputs of the amplifiers in accordance with the velocity signal and the reference signal, and a driver for driving the motor by the selected amplifier output.
Inventors
- 👤 Ken Miyagi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:43
CPC Classifications
H; H02; H02P; H02P23/00; H02P23/18; H02P23/186; Y; Y10; Y10S; Y10S388/00; Y10S388/90; Y10S388/902
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
187 words
A control unit comprising: a motor; speed detection means for detecting a rotating speed of said motor and for producing a velocity signal; reference signal generating means for generating a reference signal; means for producing an output in response to the result from phase comparison of the velocity signal from said speed detection means and the reference signal to regulate the speed of said motor; first amplified signal output means for amplifying a signal corresponding to the output from said producing means at a first gain to produce a first driving signal; second amplified signal output means for amplifying a signal corresponding to the output from said producing means at a second gain different from the first gain to produce a second driving signal; means for driving said motor in accordance with the first or second driving signal; and changing means for applying only the first driving signal to said driving means during the start of said motor and changing from the first driving signal to the second driving signal when the rotating speed of said motor reaches a predetermined stage after the start of said motor.
Claim 2
Dependent Claim
187 words
A control unit comprising: a motor; speed detection means for detecting a rotating speed of said motor and for producing a velocity signal; reference signal generating means for generating a reference signal; means for producing an output in response to the result from phase comparison of the velocity signal from said speed detection means and the reference signal to regulate the speed of said motor; first amplified signal output means for amplifying a signal corresponding to the output from said producing means at a first gain to produce a first driving signal; second amplified signal output means for amplifying a signal corresponding to the output from said producing means at a second gain different from the first gain to produce a second driving signal; means for driving said motor in accordance with the first or second driving signal; and changing means for applying only the first driving signal to said driving means during the start of said motor and changing from the first driving signal to the second driving signal when the rotating speed of said motor reaches a predetermined stage after the start of said motor.
Claim 3
Dependent Claim
38 words
A control unit according to claim 1 wherein said changing means changes from the first driving signal to the second driving signal in response to the result from phase comparison of the velocity signal and the reference signal.
Claim 4
Dependent Claim
33 words
A control unit according to claim 2 wherein said changing means includes an integrator for producing an integrated output in response to a phase difference between the velocity signal and the reference signal.
Claim 5
Dependent Claim
64 words
A control unit according to claim 1 wherein said changing means changes from the second driving signal to a third driving signal produced by said first amplified signal output means when said motor reaches a set speed in the start of said motor and said means for driving is arranged to drive said motor in accordance with the first, second or third driving signal.
Claim 6
Dependent Claim
135 words
A control unit for a movable member comprising: a motor for driving said movable member; detection means for detecting a rotating speed of said motor and for producing a detection output; means for comparing the detection output with a reference signal to generate an error signal; drive means for providing driving signals to said motor to regulate the speed of the motor in accordance with the error signal, said drive means including first and second drivers connectable to said motor for providing different level driving signals to drive said motor; and changing means for connecting only said first driver to said motor during the start of said motor and changing from said first driver to said second driver when the rotating speed of said motor reaches a predetermined stage after the start of said motor.
Claim 7
Dependent Claim
135 words
A control unit for a movable member comprising: a motor for driving said movable member; detection means for detecting a rotating speed of said motor and for producing a detection output; means for comparing the detection output with a reference signal to generate an error signal; drive means for providing driving signals to said motor to regulate the speed of the motor in accordance with the error signal, said drive means including first and second drivers connectable to said motor for providing different level driving signals to drive said motor; and changing means for connecting only said first driver to said motor during the start of said motor and changing from said first driver to said second driver when the rotating speed of said motor reaches a predetermined stage after the start of said motor.
Claim 8
Dependent Claim
46 words
A control unit for a movable member according to claim 5 further comprising reference signal generating means for generating the reference signal, wherein said drive means drives said motor in accordance with an output representing a phase difference between the reference signal and the detection output.
Claim 9
Dependent Claim
50 words
A control unit for a movable member according to claim 6 wherein each of said first and second drivers has an amplifier of different gain from each other, each amplifier amplifying a signal in accordance with the output representing the phase difference between the reference signal and the detection output.
Claim 10
Dependent Claim
34 words
A control unit for a movable member according to claim 6 or 7 wherein said changing means changes said drivers in accordance with the phase difference between the reference signal and the detection output.
Claim 11
Dependent Claim
24 words
A control unit for a movable member according to claim 5 wherein said movable member is a scanning member for scanning an original sheet.
Claim 12
Dependent Claim
36 words
A control unit for a movable member according to claim 5 wherein said changing means changes the second driver to the first driver when said motor reaches a set speed in the start of said motor.
Claim 13
Dependent Claim
32 words
A control unit for a movable member in accordance with claim 5, wherein the driving signals provided to said motor to regulate the speed thereof are in proportion to the error signal.
Claim 14
Dependent Claim
132 words
A control unit for a movable member comprising: detection means for detecting movement of said movable member and for producing a detection output; control means having first, second and third control modes for controlling said movable member in response to the detection output of said detection means to regulate an operation of the movable member; and changing means for providing only the first control mode during the start of said movable member, changing from the first control mode to the second control mode of said control means when the operation of said movable member reaches a first stage after the start of said movable member and changing from the second control mode to the third control mode when said movable member reaches a second stage after the start of said movable member.
Claim 15
Dependent Claim
132 words
A control unit for a movable member comprising: detection means for detecting movement of said movable member and for producing a detection output; control means having first, second and third control modes for controlling said movable member in response to the detection output of said detection means to regulate an operation of the movable member; and changing means for providing only the first control mode during the start of said movable member, changing from the first control mode to the second control mode of said control means when the operation of said movable member reaches a first stage after the start of said movable member and changing from the second control mode to the third control mode when said movable member reaches a second stage after the start of said movable member.
Claim 16
Dependent Claim
46 words
A control unit for a movable member according to claim 12 wherein said control means includes first and second drivers for driving said movable member and said changing means changes said drivers in response to said detection output to change control modes of said control means.
Claim 17
Dependent Claim
47 words
A control unit for a movable member according to claim 13 further comprising reference signal generating means for generating a reference signal, wherein said control means controls said movable member in response to an output representing a phase difference between the reference signal and the detection output.
Claim 18
Dependent Claim
32 words
A control unit for a movable member according to claim 14 wherein said changing means changes said drivers in response to the phase difference between the reference signal and the detection output.
Claim 19
Dependent Claim
46 words
A control unit for a movable member according to claim 14 or 15 wherein said drivers each has an amplifier of different gain from each other for amplifying a signal in accordance with the output representing the phase difference between the reference signal and detection output.
Claim 20
Dependent Claim
24 words
A control unit for a movable member according to claim 12 wherein said movable member is a scanning member for scanning an original sheet.
Claim 21
Dependent Claim
24 words
A control unit for a movable member according to claim 12 wherein said third control mode is the same as said first control mode.
References Cited (Backward Citations)
US3176208A
Cited
US3309597A
Cited
GB1386961A
Cited
US3706923A
Cited
US3708737A
Cited
US3911343A
Cited
US4238716A
Cited
US4284940A
Cited
US4374350A
Cited
US4338555A
Cited
US4366422A
Cited
US4375609A
Cited
US4453118A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-11 | 1990-02-10 | 1990-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-11 | 1994-02-10 | 1994-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-11 | 1998-02-10 | 1998-08-12 | $7700.00 | Window Closed / Lapsed |