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公开(公告)号：FR2513830B1
公开(公告)日：1986-11-28
申请号：FR8216220
申请日：1982-09-27
Applicant: SONY CORP
Inventor： SONODA MADAKAZU , TERAJIMA TAKASHI , OZAWA MINORU
IPC: G11B15/18 , G11B15/20 , G11B15/467 , G11B15/48 , G11B15/54 , H02P3/08 , H02P7/06 , H02P23/00 , H02P5/16 , H04N5/782
Abstract: A control circuit for a DC capstan motor used for driving a tape having control signals thereon is adapted for accurate stopping of the tape during intermittent-motion operation. A frequency generator coupled to the motor generates a frequency signal whose frequency is proportional to the motor's speed. A position signal generating circuit generates a position value that increments by steps upon occurrences of the frequency signal. A clamp circuit clamps the position value to a clamping level upon detection of the control signals. A brake start signal generator provides a brake start pulse signal when the position value exceeds a predetermined threshold, and this brake start pulse signal is used to commence braking of the motor. In order to permit accurate stopping in both forward and reverse directions, the clamping circuit provides one clamping level when a forward mode is selected and another clamping level when a reverse mode is selected.
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公开(公告)号：DE3235446A1
公开(公告)日：1983-05-11
申请号：DE3235446
申请日：1982-09-24
Applicant: SONY CORP
Inventor： SONODA MASAKUZU , TERAJIMA TAKASHI , OZAWA MINORU
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公开(公告)号：FR2513830A1
公开(公告)日：1983-04-01
申请号：FR8216220
申请日：1982-09-27
Applicant: SONY CORP
Inventor： SONODA MADAKAZU , TERAJIMA TAKASHI , OZAWA MINORU
IPC: G11B15/18 , G11B15/20 , G11B15/467 , G11B15/48 , G11B15/54 , H02P3/08 , H02P7/06 , H02P23/00 , H02P5/16 , H04N5/782
Abstract: A control circuit for a DC capstan motor used for driving a tape having control signals thereon is adapted for accurate stopping of the tape during intermittent-motion operation. A frequency generator coupled to the motor generates a frequency signal whose frequency is proportional to the motor's speed. A position signal generating circuit generates a position value that increments by steps upon occurrences of the frequency signal. A clamp circuit clamps the position value to a clamping level upon detection of the control signals. A brake start signal generator provides a brake start pulse signal when the position value exceeds a predetermined threshold, and this brake start pulse signal is used to commence braking of the motor. In order to permit accurate stopping in both forward and reverse directions, the clamping circuit provides one clamping level when a forward mode is selected and another clamping level when a reverse mode is selected.
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公开(公告)号：GB2108718B
公开(公告)日：1985-10-30
申请号：GB8227311
申请日：1982-09-24
Applicant: SONY CORP
Inventor： SONODA MASAKAZU , TERAJIMA TAKASHI , OZAWA MINORU
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公开(公告)号：GB2108717B
公开(公告)日：1985-07-10
申请号：GB8227310
申请日：1982-09-24
Applicant: SONY CORP
Inventor： SONODA MASAKAZU , TERAJIMA TAKASHI , OZAWA MINORU
Abstract: A control circuit for a DC capstan motor used for driving a tape having control signals thereon is adapted for accurate stopping of the tape during intermittent-motion operation. A frequency generator coupled to the motor generates a frequency signal whose frequency is proportional to the motor's speed. A position signal generating circuit generates a position value that increments by steps upon occurrences of the frequency signal. A clamp circuit clamps the position value to a clamping level upon detection of the control signals. A brake start signal generator provides a brake start pulse signal when the position value exceeds a predetermined threshold, and this brake start pulse signal is used to commence braking of the motor. In order to permit accurate stopping in both forward and reverse directions, the clamping circuit provides one clamping level when a forward mode is selected and another clamping level when a reverse mode is selected.
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Patent Agency Ranking
公开(公告)号：AU8870682A
公开(公告)日：1983-03-31
申请号：AU8870682
申请日：1982-09-24
Applicant: SONY CORP
Inventor： SONODA MASAKAZU , TERAJIMA TAKASHI , OZAWA MINORU
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公开(公告)号：FR2519817A1
公开(公告)日：1983-07-18
申请号：FR8216221
申请日：1982-09-27
Applicant: SONY CORP
Inventor： SONODA MASAKAZU , TERAJIMA TAKASHI , OZAWA MINORU
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公开(公告)号：GB2108718A
公开(公告)日：1983-05-18
申请号：GB8227311
申请日：1982-09-24
Applicant: SONY CORP
Inventor： SONODA MASAKAZU , TERAJIMA TAKASHI , OZAWA MINORU
Abstract: A control circuit for a DC capstan motor used for driving a tape having control signals thereon is adapted for accurage stopping of the tape during intermittent-motion operation. A frequency generator coupled to the motor generates a frequency signal whose rate is proportional to the motor's speed. A position signal generating circuit generates a position value that increments by steps upon occurrences of the frequency signal. A clamp circuit clamps the position value to a clamping level upon detection of the control signals. A brake start signal generator provides a brake start pulse signal when the position value exceeds a predetermined threshold, and this brake start pulse signal is used to commence braking of the motor. In order to permit accurate stopping in both forward and reverse directions, the clamping circuit provides one clamping level when a forward mode is selected and another clamping level when a reverse mode is selected.
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公开(公告)号：DE3235445A1
公开(公告)日：1983-05-05
申请号：DE3235445
申请日：1982-09-24
Applicant: SONY CORP
Inventor： SONODA MADAKAZU , TERAJIMA TAKASHI , OZAWA MINORU
IPC: G11B15/18 , G11B15/20 , G11B15/467 , G11B15/48 , G11B15/54 , H02P3/08 , H02P7/06 , H02P23/00 , H04N5/782
Abstract: A control circuit for a DC capstan motor used for driving a tape having control signals thereon is adapted for accurate stopping of the tape during intermittent-motion operation. A frequency generator coupled to the motor generates a frequency signal whose frequency is proportional to the motor's speed. A position signal generating circuit generates a position value that increments by steps upon occurrences of the frequency signal. A clamp circuit clamps the position value to a clamping level upon detection of the control signals. A brake start signal generator provides a brake start pulse signal when the position value exceeds a predetermined threshold, and this brake start pulse signal is used to commence braking of the motor. In order to permit accurate stopping in both forward and reverse directions, the clamping circuit provides one clamping level when a forward mode is selected and another clamping level when a reverse mode is selected.
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公开(公告)号：CA1194991A
公开(公告)日：1985-10-08
申请号：CA411954
申请日：1982-09-22
Applicant: SONY CORP
Inventor： SONODA MASAKAZU , TERASHIMA TAKASHI , OZAWA MINORU
IPC: G11B15/18 , G11B15/20 , G11B15/467 , G11B15/48 , G11B15/54 , H02P3/08 , H02P7/06 , H02P23/00 , G11B15/28
Abstract: A control circuit is used during slow or stop-motion playback operation of a video tape device to drive video tape intermittently. In order to avoid errors in the stopping position of the tape, a pulse width modulated (PWM) signal is provided to a motor controller circuit associated with the capstan motor of the video tape device. A frequency signal generator coupled to this motor generates a frequency signal that varies with the capstan motor speed, and this frequency signal is provided to a retrigger monostable multivibrator which generates a PWM signal whose duty ratio changes in proportion to the capstan motor speed. A drive pulse generator and a brake pulse generator provide drive start and brake start signals, respectively, when it is desired to commence and stop movement of the tape. A drive circuit, including the retrigger monostable multivibrator, receives the drive start signal, the brake start signal, and the frequency signal to generate the PWM signal which is supplied to the motor controller circuit. The frequency signal is selected to have a pulse rate several tens of times the ripple frequency of the motor's torque ripple characteristic so that inaccuracies in stopping position of the motor are eliminated.
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