US3752935A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic switch device for magnetic recording and reproducing device
Assignee: Canon Inc
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Filing: 1971-01-06
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Granted: 1973-08-14
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Expires: 1991-01-06
Abstract
Abstract An automatic change-over mechanism for a magnetic recordingreproducing device which contains therein an endless magnetic recording medium and which may be additionally connected with a separate conventional magnetic recording-reproducing device without reforming the interior construction thereof. The changeover mechanism basically comprises detector means for detecting an electrical variation appearing at the external terminal of the separate magnetic recording-reproducing device when it is in its reproduce mode, and switching means electrically associated with the detector means and operated thereby to change over the connected recording-reproducing device between its operation mode for transferring the information reproduced by the separate recording-reproducing device and its operation mode for reproducing the transferred information, whereby the magnetic recording-reproducing device connected to the separate one may be auotmatically operable to repeatedly reproduce the transferred information after the separate device has been stopped from its reproducing operation.
Inventors
- 👤 Y Iwawaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:58
CPC Classifications
G; G11; G11B; G11B31/00; G11B15/00; G11B15/02; G11B27/00; G11B27/005; G11B27/007
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
458 words
A magnetic record and reproducing device comprising: input terminals for receiving an electrical signal from a signal generating source; a power amplifier for amplifying the signal applied from said input terminals; a record amplifier connected to said input terminals for amplifying the electrical signal received from said input terminals; an endless tape for recording the signal thereon; a recording and reproducing head for recording said signal on said endless tape and for reproducing the signal previously recorded on the endless tape; an erase head disposed in side-by-side relationship with respect to said recording and reproducing head and upstream in the direction of movement of said endless tape for erasing signals previously recorded on said endless tape; an erasing current generating circuit for generating an erasing current to erase the signals recorded on said endless tape; switch means comprising first, second and third double throw switches ganged together for simultaneous movement, said first switch being switchable to connect to one contact of said second switch to present a reproducing mode, said second switch being switchable to connect said record amplifier and said recording and reproducing head to present a recording mode, and said third switch being switchable to connect said erasing current generating circuit and said erase head; a reproduce-preamplifier for amplifying the signal read out of said endless tape by said recording and reproducing head; means for selectively applying the signal from said reproducing preamplifier to said power amplifier; a transducer connected to said power amplifier for converting the electrical signal to an audio signal; and a control unit responsive to the signal from said signal generating source for controlling said switch means; said control unit comprising, a detector for detecting the presnce and the absence of the signal generated by said signal generating source, means responsive to the presence of the signal detected by said detector for actuating said switch means to switch the device from the reproducing mode to the recording mode responsive to the absence of the signal detected by said detector for actuating said switch means to switch the device from the recording mode to the reproducing mode, said detector comprising: input terminals connectable to a power supply; connecting terminals connected to said input terminals for supplying said signal generating source with a voltage; detecting means connected between said input terminals and said connecting terminals for detecting a current flowing therethrough; a discriminator for generating an output when the current detected by said detecting means is over a predetermined value, thereby detecting whether said signal generating source is in an operating condition, said detecting means comprising, a current transformer having a primary winding connected between one of said input terminals and one of said connecting terminals and a secondary winding connected to said discriminator.
Claim 2
Dependent Claim
458 words
A magnetic record and reproducing device comprising: input terminals for receiving an electrical signal from a signal generating source; a power amplifier for amplifying the signal applied from said input terminals; a record amplifier connected to said input terminals for amplifying the electrical signal received from said input terminals; an endless tape for recording the signal thereon; a recording and reproducing head for recording said signal on said endless tape and for reproducing the signal previously recorded on the endless tape; an erase head disposed in side-by-side relationship with respect to said recording and reproducing head and upstream in the direction of movement of said endless tape for erasing signals previously recorded on said endless tape; an erasing current generating circuit for generating an erasing current to erase the signals recorded on said endless tape; switch means comprising first, second and third double throw switches ganged together for simultaneous movement, said first switch being switchable to connect to one contact of said second switch to present a reproducing mode, said second switch being switchable to connect said record amplifier and said recording and reproducing head to present a recording mode, and said third switch being switchable to connect said erasing current generating circuit and said erase head; a reproduce-preamplifier for amplifying the signal read out of said endless tape by said recording and reproducing head; means for selectively applying the signal from said reproducing preamplifier to said power amplifier; a transducer connected to said power amplifier for converting the electrical signal to an audio signal; and a control unit responsive to the signal from said signal generating source for controlling said switch means; said control unit comprising, a detector for detecting the presnce and the absence of the signal generated by said signal generating source, means responsive to the presence of the signal detected by said detector for actuating said switch means to switch the device from the reproducing mode to the recording mode responsive to the absence of the signal detected by said detector for actuating said switch means to switch the device from the recording mode to the reproducing mode, said detector comprising: input terminals connectable to a power supply; connecting terminals connected to said input terminals for supplying said signal generating source with a voltage; detecting means connected between said input terminals and said connecting terminals for detecting a current flowing therethrough; a discriminator for generating an output when the current detected by said detecting means is over a predetermined value, thereby detecting whether said signal generating source is in an operating condition, said detecting means comprising, a current transformer having a primary winding connected between one of said input terminals and one of said connecting terminals and a secondary winding connected to said discriminator.
Claim 3
Dependent Claim
437 words
A magnetiC recording and reproducing device comprising: input terminals for receiving an electrical signal from a signal generating source; a power amplifier for amplifying the signal applied from said input terminals; a record amplifier connected to said input terminals for amplifying the electrical signal received from said input terminals; an endless tape for recording the signal thereon; a recording and reproducing head for recording said signal on said endless tape and for reproducing the signal previously recorded on the endless tape; an erase head disposed in side-by-side relationship with respect to said recording and reproducing head and upstream in the direction of movement of said endless tape for erasing signals previously recorded on said endless tape; an erasing current generating circuit for generating an erasing current to erase the signals recorded on said endless tape; switch means comprising first, second and third double throw switches ganged together for simultaneous movement, said first switch being switchable to connect to one contact of said second switch to present a reproducing mode, said second switch being switchable to connect said record amplifier and said recording and reproducing head to present a recording mode, and said third switch being switchable to connect said erasing current generating circuit and said erase head; a reproduce-preamplifier for amplifying the signal read out of said endless tape by said recording and reproducing head; means for selectively applying the signal from said reproducing preamplifier to said power amplifier; a transducer connected to said power amplifier for converting the electrical signal to an audio signal; and a control unit responsive to the signal from said signal generating source for controlling said switch means; said control unit comprising, a detector for detecting the presence and the absence of the signal generated by said signal generating source, means responsive to the presence of the signal detected by said detector for actuating said switch means to switch the device from the reproducing mode to the recording mode responsive to the absence of the signal detected by said detector for actuating said switch means to switch the device from the recording mode to the reproducing mode, said signal generating source being another magnetic recording and reproducing device having a first terminal for deriving a potential appearing across a motor and a second terminal for deriving a reproducing output; said control unit comprising a resistor connected across said first terminal and said second terminal, the end which is connected to the second terminal being also connected to ground, and an amplifier circuit for amplifying the signal at said resistor, thereby detecting whether said motor of said other recording and reproducing device operates.
Claim 4
Dependent Claim
437 words
A magnetiC recording and reproducing device comprising: input terminals for receiving an electrical signal from a signal generating source; a power amplifier for amplifying the signal applied from said input terminals; a record amplifier connected to said input terminals for amplifying the electrical signal received from said input terminals; an endless tape for recording the signal thereon; a recording and reproducing head for recording said signal on said endless tape and for reproducing the signal previously recorded on the endless tape; an erase head disposed in side-by-side relationship with respect to said recording and reproducing head and upstream in the direction of movement of said endless tape for erasing signals previously recorded on said endless tape; an erasing current generating circuit for generating an erasing current to erase the signals recorded on said endless tape; switch means comprising first, second and third double throw switches ganged together for simultaneous movement, said first switch being switchable to connect to one contact of said second switch to present a reproducing mode, said second switch being switchable to connect said record amplifier and said recording and reproducing head to present a recording mode, and said third switch being switchable to connect said erasing current generating circuit and said erase head; a reproduce-preamplifier for amplifying the signal read out of said endless tape by said recording and reproducing head; means for selectively applying the signal from said reproducing preamplifier to said power amplifier; a transducer connected to said power amplifier for converting the electrical signal to an audio signal; and a control unit responsive to the signal from said signal generating source for controlling said switch means; said control unit comprising, a detector for detecting the presence and the absence of the signal generated by said signal generating source, means responsive to the presence of the signal detected by said detector for actuating said switch means to switch the device from the reproducing mode to the recording mode responsive to the absence of the signal detected by said detector for actuating said switch means to switch the device from the recording mode to the reproducing mode, said signal generating source being another magnetic recording and reproducing device having a first terminal for deriving a potential appearing across a motor and a second terminal for deriving a reproducing output; said control unit comprising a resistor connected across said first terminal and said second terminal, the end which is connected to the second terminal being also connected to ground, and an amplifier circuit for amplifying the signal at said resistor, thereby detecting whether said motor of said other recording and reproducing device operates.
Claim 5
Dependent Claim
27 words
A magnetic recording and reproducing device according to claim 2, wherein said amplifier circuit comprises a positive amplifier and a negative amplifier connected in a push-pull relation.
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) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |