Patent US4675752A successfully refreshed from Google Patents.
US4675752A
Expired / Lapsed
US
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Apparatus for recording and/or reproducing video signals
Assignee: Hitachi Ltd
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Filing: 1985-07-30
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Granted: 1987-06-23
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Expires: 2005-07-30
Abstract
Abstract An apparatus for recording and/or reproducing video signals on a magnetic tape wherein a capstan and driving motor are coupled by a belt for driving the tape. The motor is connected to a power supply circuit through a switching circuit and voltage is applied from the switching circuit to the motor for driving the belt and therewith the tape. The motor driving voltage application time is controlled to be substantially equal to an integer multiple of the reciprocal of the resonance frequency of the belt driving system.
Inventors
- 👤 Housei Higashi
- 👤 Takao Terayama
- 👤 Hideo Nishijima
- 👤 Hiroshi Nakamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 05:35
CPC Classifications
G; G11; G11B; G11B15/00; G11B15/18; G11B15/20; G11B15/1808; G11B15/1875
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
113 words
An apparatus for recording and/or reproducing video signals on a magnetic tape, comprising a capstan and a driving motor being coupled by a belt, the motor being connected to a power supply circuit through a switching circuit, means for applying a voltage from said switching circuit to said motor to drive said capstan intermittently, and means for controlling the motor driving voltage application time of the voltage applying means to be set to be substantially equal to an integer multiple of the reciprocal of the resonant frequency of the belt driving system, so as to enable suppression of residual vibration generated in the belt driving system when the magnetic tape is driven intermittently.
Claim 2
Independent Claim
113 words
An apparatus for recording and/or reproducing video signals on a magnetic tape, comprising a capstan and a driving motor being coupled by a belt, the motor being connected to a power supply circuit through a switching circuit, means for applying a voltage from said switching circuit to said motor to drive said capstan intermittently, and means for controlling the motor driving voltage application time of the voltage applying means to be set to be substantially equal to an integer multiple of the reciprocal of the resonant frequency of the belt driving system, so as to enable suppression of residual vibration generated in the belt driving system when the magnetic tape is driven intermittently.
Claim 3
Dependent Claim
37 words
An apparatus as defined in claim 1, wherein the controlling means includes means for detecting a control pulse signal on the magnetic tape, and means for operating said switching circuit according to said set voltage application time.
Claim 4
Dependent Claim
21 words
An apparatus as defined in claim 2, wherein said switching circuit includes contacts for shunting the connection of said motor therewith.
Claim 5
Dependent Claim
27 words
An apparatus as defined in claim 3, wherein the controlling means includes a monostable multivibrator responsive to said control pulse signal for controlling the voltage application time.
Claim 6
Dependent Claim
26 words
An apparatus as defined in claim 2, wherein said switching circuit includes contacts for switching said motor from the start to the damping voltage application side.
Claim 7
Dependent Claim
59 words
An apparatus as defined in claim 5, wherein the controlling means includes a first monostable multivibrator responsive to the control pulse signal for controlling the voltage application time, a flip flop responsive to the signal from said first monostable multivibrator, and a second monostable multivibrator responsive to the signal from the flip-flop for controlling a damping voltage application time.
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) | 1990-06-22 | 1990-12-22 | 1991-06-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-06-22 | 1994-12-22 | 1995-06-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-06-22 | 1998-12-22 | 1999-06-23 | $7700.00 | Window Closed / Lapsed |