JPH0341289Y2 - - Google Patents

Description

[Detailed Description of the Invention] (a) Field of Industrial Application The present invention relates to a so-called double cassette, which is equipped with two independent magnetic recording and reproducing devices within the same housing.

(b) Prior art The so-called double cassette, which is equipped with two independent magnetic recording and reproducing devices in the same housing, can be configured with the same circuit at the time of design, so the signal level can be unified; Even when a magnetic tape signal reproduced by one magnetic recording/playback device is used as a recording input signal for another magnetic recording/playback device, high-quality tape editing is possible with almost no deterioration in sound quality, making it popular.

However, a conventional tape editing device (dubbing device) of this type is known from Japanese Utility Model Application Publication No. 51-46312, but this type of dubbing device has a playback button of a first magnetic recording/playback device and a second button. A connecting mechanism is provided for pressing the playback button and the recording button of the magnetic recording/playback device at the same time. However, such a coupling mechanism is required only during dubbing, and is unnecessary in normal conditions, making it mechanically complicated and undesirable.

Also, since a double cassette originally has two independent magnetic recording and playback devices,
It has naturally been considered that when one magnetic recording/reproducing device finishes its operation, the other magnetic recording/reproducing device can be operated continuously in a preset operating mode. There are various continuous operation devices of this type, and one that has been mechanically solved is one that uses the rotation stop mechanism of the reel shaft of one magnetic recording and reproducing device to supply power to the drive motor of the other magnetic recording and reproducing device. be.

Also, the circuit solution was published in Tokuko Sho 54-2565.
It is publicly known in the publication No. And this kind of special public service 1977-
Publication No. 2565 discloses a second switch that is controlled by a recording or playback position or a stop position that supplies driving power to the mechanism drive motors of each of a first magnetic recording and playback device and a second magnetic recording and playback device. a first magnetic recording device, which is controlled by the recording or playback position or stop position of one of the magnetic recording and playback devices;
A switch is connected in series to the other mechanism drive motor, and when one magnetic recording/playback device stops operating, the first switch closes and supplies drive power to the other magnetic recording/playback device, allowing it to operate continuously. Since there is no mechanical means for detecting the stoppage of one magnetic recording and reproducing device and operating the other magnetic recording and reproducing device, continuous reproduction can be easily performed.

However, even if the respective second switches are pressed to perform tape editing, dubbing cannot be performed because the first switch of one of the magnetic recording and reproducing devices is open.

(c) Purpose of the invention The present invention was made in view of the above points, and it is possible to connect the first magnetic recording and reproducing device to the second magnetic recording and reproducing device without using any mechanical connection means.
The first and second magnetic recording and reproducing devices are magnetic recording and reproducing devices that can perform dubbing and can operate continuously in a preset operating mode of the other magnetic recording and reproducing device when one magnetic recording and reproducing device stops operating. This problem was solved by means of one-way conduction between the mechanism drive motors.

(d) Structure of the invention The present invention drives the first and second mechanism drive motors simultaneously or alternately by means of one-way conduction means provided between the function switch and the first and second mechanism drive motors. It is configured to do so.

(e) Embodiment FIG. 1 is a circuit diagram of a magnetic recording and reproducing device in which the present invention is implemented. 2A and 2B are flowcharts showing the operation of FIG. 1. F1 is the power supply (+
Movable contact 1 connected to B ₁ ), fixed contact 2,
3, when the movable contact 1 is switched to the fixed contact 2, the dubbing operation mode is set, and when the movable contact 1 is switched to the fixed contact 3, the continuous operation mode is set. SA can be turned on and off by operating any operation button other than the pause button on the first magnetic recording/playback device.
This is the first switch that is turned off.It is turned off when the stop button is pressed or when the automatic stop device that automatically returns to the stop position at the end of the tape is activated, and other operations (PLAY, FF, REW, etc.) turn it on. .
MA is a motor for driving the mechanism of the first magnetic recording and reproducing device, and is installed between the fixed contact 2 and the ground.
Power is supplied by turning on the first switch SA.
Similarly, SB is the first switch that is turned on and off by operating the operation buttons other than the pause button of the second magnetic recording and playback device, and MB is the motor for driving the mechanism of the second magnetic recording and playback device, and the fixed contact 3 and the ground, and when the first switch SB is turned on, the circuit between the fixed contact 3 and the motor MB is closed.

S1 is a second switch that is turned on and off by the movement of a head member (not shown) of the second magnetic recording and reproducing device, and its movable contact P1 is fixed when the second magnetic recording and reproducing device is in constant speed mode such as playback and recording. Contact P
In other modes, the contact is switched to the fixed contact P3 side as the head member (not shown) moves away from the magnetic tape. That is, the second
Switch S1 is in constant speed mode and the first fixed contact P2
In modes other than the position and constant speed modes, the fixed contact P3 assumes the second position.

Next, 4 and 5 are diodes which are one-way conduction means, and diode 5 connects the anode to the first motor.
It is connected between MA and the first switch SA, and its cathode is connected between the fixed contact 3 and the second switch SB.
The diode 4 has an anode connected to the fixed contact P3 of the second switch S1, and a cathode connected between the fixed contact 2 and the first switch SA.

Next, the control structure of the playback/recording circuit (P/R) of the first and second magnetic recording/playback devices using the control device S for the first and second mechanism drive motors MA, MB described above will be explained.

Reference numeral 6 designates a reproduction magnetic head of the first magnetic recording and reproducing device, 7 a reproduction equalizer circuit, 8 a recording and reproducing magnetic head of the second magnetic recording and reproducing device, and 9 a reproduction equalizer circuit. The magnetic tape playback signals from the playback equalizer circuits 7 and 9 are sent to the subsequent Dolby circuit 12 via coupling capacitors 10 and 11.
The signal is input to the amplifier circuit 13, which amplifies the signal up to the input level. The amplifier circuit 13 is composed of two NPN transistors 14 and 15 whose collectors are commonly connected and connected to a power supply (+B ₂ ), and the amplifier circuit 13 is composed of two NPN transistors 14 and 15 whose collectors are connected in common and connected to a power supply (+B 2 ). A magnetic tape reproduction signal is input from its emitter to the Dolby circuit 12 via coupling capacitors 16 and 17. As is well known, the Dolby circuit 12 includes a playback amplifier and a recording amplifier. 18 is a line out terminal for a magnetic tape reproduction signal. The output of the recording amplifier built into the Dolby circuit 12 is supplied via line C to a recording output circuit 19 that performs recording compensation, and then to the recording/reproducing magnetic head 8.

20 is a recording changeover switch of the second magnetic recording and reproducing device.

Muting transistors 21 and 22 select the input of magnetic tape playback signals of the first and second magnetic recording and playback devices to the amplifier circuit 13, and are provided after the coupling capacitors 10 and 11. The base of the muting transistor 22 is connected to the cathode of the diode 4 via line a, and the base of the muting transistor 21 is connected to the fixed contact P2 of the first switch S1 via line b. Further, a switching transistor 23 for switching the muting transistor 21 is connected between the line a and the line b. switching transistor 23
The base of is connected to line a through resistor r,
Moreover, the collector is connected to line b, and the emitter is grounded.

The operation of the present invention having such a configuration will be explained according to the flowchart shown in FIGS. 2A and 2B.

[] When the function switch F1 is in the dubbing operation mode position: See the flowchart in Figure 2A.

At this time, if the first magnetic recording and reproducing device is not operated in any way, the first switch SA is
Since it is in the OFF state, the power supply (+B ₁ ) is not connected to the second motor MB via diode 5, so even if the first switch SB is operated, the first switch will not be connected.
SB is simply turned on.

[-1] When the first switch (SB) is OFF and the first switch SA is turned on: When the first switch SA is ON, the power (+B ₁ ) is supplied to the motor MA via the function switch F1 and the first switch SA. is supplied to When an "H" signal is generated on line a, the muting transistor 22 is activated, and the magnetic tape playback signal of the second magnetic recording/playback device is grounded and is not input to the amplifier 13. Therefore, when the first switch SA is turned on during the playback operation of the first magnetic recording/playback device, the magnetic tape playback signal played back by the playback magnetic head 6 is transmitted to the transistor via the playback equalizer circuit 7 and the coupling capacitor 10. After being amplified at 14, the signal is extracted from the emitter, decoded by the Dolby circuit 12 via a coupling capacitor 16, and then supplied to the line out terminal 18. In addition, when the first magnetic recording/playback device is operated other than PLAY, the first switch SA is activated in response.
Turns on and operates in the selected mode.

[-2] When the first switch SA is turned on, the first switch SB is turned on (a) When the second magnetic recording/playback device is operated for playback or recording The first switch SB is turned on and the first switch SB is turned on. The movable contact P1 of the second switch S1 is switched to the fixed contact P2 by movement of a head member (not shown). The power supply voltage (+B ₁ ) is applied to the first switch SB, the second motor MB and the second switch S1 via the diode 5.
supplied to Fixed contact P2 of second switch S1
Line b becomes "H" through the signal. However, since the line a is "H", the switching transistor 23 is activated, the "H" signal on the line b is grounded, and the muting transistor 21 is cut off and does not operate.

Therefore, the magnetic tape playback signal of the first magnetic recording and playback device is generated at the line out terminal 18, and sound is emitted, but even though the second magnetic recording and playback device is in the playback mode, the amplifier circuit 13 Since the signal is muted before the input of the line-out terminal 18, it does not occur at the line-out terminal 18. During the recording operation of the second magnetic recording/playback device, the recording selector switch 20 is switched to the recording side, so the magnetic tape signal played back by the first magnetic recording/playback device is amplified by the recording amplifier built in the Dolby circuit 20. After that, the signal is supplied to the recording output circuit 19 via line c, and is recorded on a magnetic tape (not shown) of the second magnetic recording/reproducing device.

(b) When the first switch SB is operated when the second magnetic recording/playback device is in an operation mode other than playback or recording: At this time, the second switch S1 is not switched and the movable contact P1 is closed to the fixed contact P3. Therefore, the output "H" is not generated on line b and the muting transistor 21 is not activated, but only the muting transistor 22 is activated, and the line out terminal 18 is connected to the magnetic tape playback of the first magnetic recording/playback device. A signal is being generated. but,
Since power is supplied to the second motor MB via the diode 5 and the first switch SB, the second magnetic recording/playback device operates in an operation mode other than playback or recording, such as fast forwarding or rewinding.

[-3] When the first switch SA is turned on in an operation mode other than playback: (c) When the second magnetic recording/playback device is operated for playback or recording: The movable contact P1 of the second switch S1 is a fixed contact. P
Switches to 2. Although the line b goes to the "H" level, the line a remains at the "H" level, so the switching transistor 23 is activated, dropping the "H" level of the line b to the ground potential. As a result, muting transistor 21 is not activated and muting transistor 22 is activated. Therefore, when the second magnetic recording/playback device is operated for playback or recording, the mechanism performs the playback and recording operations, but the magnetic tape playback signal is muted before inputting to the amplifier circuit 13, so that no input signal is input to the Dolby circuit 12. No signal provided.

(d) When the second magnetic recording/playback device is operated other than playback or recording: The movable contact P1 of the second switch S1 is replaced by the fixed contact P1.
It remains switched to 3. The first and second mechanisms therefore operate in respective modes of operation.

[-4] When the first switch SB is turned on, when the first switch SA is turned on (e) Dubbing operation When the first switch SB is turned on by recording operation before turning on the first switch SA, dubbing operation becomes. This will be explained below. At this time, the first switch SB
When is turned on by the recording operation of the second magnetic recording and reproducing device, the recording changeover switch 20 is switched to the recording side contact R in conjunction with this recording operation. Furthermore, due to the movement of the head member (not shown), the contact point P1 of the second switch S1
is switched to fixed contact P2.

Next, by operating the first magnetic recording and reproducing device, the first
When switch SA is turned on, the first motor MA
is driven, and the diode 5 and the first switch
A second motor MB is driven via SB.
At this time, the power supply voltage (+
B ₁ ) are applied simultaneously, so the first and second mechanisms are activated simultaneously. In addition, when the first switch SA is turned on, the power supply voltage (+B ₁ ) is supplied to the diode 5 and the second switch S1, so line b becomes "H" level, but line a becomes "H" level.
level, so the switching transistor 23
is activated, and line b is grounded to the "L" level. As a result, only the magnetic tape playback signal from the first magnetic recording/playback device is input to the amplifier circuit 13.

The magnetic tape reproduction signal reproduced by the reproduction magnetic head 6 is amplified by the transistor 14 via the reproduction equalizer circuit 7 and the coupling capacitor 10. The amplified reproduction signal is input to the Dolby circuit 12 via the coupling capacitor 16. The playback signal decoded by the Dolby circuit 12 is output to the line out terminal 18, and the sound is emitted by a speaker (not shown).

On the other hand, the playback signal amplified by the recording amplifier built in the Dolby circuit 12 is subjected to recording compensation in the recording output circuit 19, and then input to the recording/playback magnetic head 8, where it is recorded onto a magnetic tape (not shown).

(f) The first switch SB is turned on by operations other than recording.
When: At this time, when the first switch SA is turned ON, power (+B ₁ ) is supplied to the second motor MB via diode 5 and the first switch SB, and in each operation mode of the first switch SB. The second magnetic recording and reproducing device is driven.

Note that when the first switch SB is turned on for playback operation, the second magnetic recording/playback device performs playback operation, but since the muting transistor 22 is operating, the magnetic tape playback signal from the recording/playback magnetic head 8 is is not input to the amplifier circuit 13. However, although it is not clearly stated in the flowchart,
When function switch F1 is switched to the terminal 3 side in this state, line a goes to "L" level.
The line b becomes "H" level, the muting transistor 21 is activated, and the magnetic tape playback signal of the first magnetic recording/playback device is muted,
The magnetic tape playback signal from the second magnetic recording/playback device is input to the amplifier circuit 13 and supplied to the Dolby circuit 12, so that the magnetic tape playback signal from the second magnetic recording/playback device is now emitted. be done.
When the function switch F1 is switched to the terminal 2 side again, the power supply voltage (+B ₁ ) of the first magnetic recording/reproducing device is supplied to the first mechanism drive motor MA via the first switch SA. Therefore, the first magnetic recording and reproducing device enters the reproducing state and emits sound. Therefore, by operating both magnetic recording and reproducing devices and switching the function switch F1, the magnetic tape reproduction signal of one of the magnetic recording and reproducing devices can be listened to as appropriate.

[] When the function switch F1 is in the continuous operation mode position: At this time, the operation of the first magnetic recording and reproducing device is controlled by the position of the contact P1 of the second switch S1 of the second magnetic recording and reproducing device. .

[-1] When the contact P1 of the second switch S1 is switched to the fixed contact P2: Continuous operation When the contact P1 of the second switch S1 is switched to the fixed contact P2, that is, the first switch SB is regenerated Or when it is turned on during a recording operation.
At this time, since no "H" signal is generated on line a, the muting transistor 22 is not activated. Further, power (+B ₁ ) is supplied to line b via the first switch S1, line b is at "H" level, and muting transistor 21 is activated. Therefore, the amplifier circuit 13
is supplied with a magnetic tape playback signal from the second magnetic recording/playback device.

The operation will be explained. This operation is performed before turning on the playback or recording operation of the first switch SB or
This is achieved by turning on the first switch SA after turning it on.

That is, when the contact P1 of the second switch S1 is switched to the fixed contact P2, the first motor
Power is not supplied to MA even if the first switch SA is turned on, but if the first switch SA is turned on in advance to close the circuit between the diode 4 and the first motor MA, the first magnetic recording/playback device is activated. When the automatic stop device automatically stops at the end of the tape, the head member of the second magnetic recording/reproducing device (not shown) is separated from the magnetic tape, and the contact P1 of the first switch S1 is activated.
This is achieved by switching to the fixed contact P3.

When the automatic stop device of the first magnetic recording/playback device is activated or stopped, the contact P of the second switch S1
1 switches to fixed contact P3, the power supply (+B ₁ )
is supplied to the diode 4 via the second switch S1. The first motor via the first switch S4
MA is driven. Line a becomes "H" level. Muting transistor 22 is activated. The magnetic tape playback signal of the second magnetic recording and playback device is muted. Muting transistor 21 is inoperative. In other words, the first switch SA is activated by the playback operation of the first magnetic recording/playback device.
When turned ON, playback starts continuously when the second magnetic recording/playback device plays or the recording operation stops.

If the first switch SA is turned on for an operation other than playback, when the second magnetic recording and playback device is stopped, the first magnetic recording and playback device is operated in a set operation mode other than playback.

[-2] When the contact P1 of the second switch S1 is switched to the fixed contact P3: At this time, the power (+B ₁ ) is supplied to the first switch SA via the diode 4, so the first
When the switch SA is turned on, power (+B ₁ ) is supplied to the first motor MA, and the first motor MA operates in the operated mode of the first magnetic recording/reproducing device.

Simply put, when the second magnetic recording and reproducing device is fast forwarding and rewinding, the first magnetic recording and reproducing device can be operated and operated independently.

(f) Effects of the invention As described above, the present invention provides a power source, a function switch selectively connected to the power source for selecting dubbing mode and continuous mode, and a first function switch each having a mechanism driving motor. and a second magnetic recording/playback device, and the first and second magnetic recording/playback devices each have a device that can be turned on/off by an operation other than a pause operation.
The first magnetic recording/playback device side connects one side to the dubbing mode terminal of the function switch, the other side to the mechanism drive motor, and the second magnetic recording/playback device side connects one side to the dubbing mode terminal of the function switch. to the continuous mode terminal of the switch.
a first switch, the other of which is connected to a motor for driving the mechanism, and a first position that is a recording or playback position of the head member of the second magnetic recording and playback device, and a second position that is other than the recording or playback position; a second switch having a fixed contact connected to the continuous mode terminal of the function switch;
a switch, a first one-way conduction means having one side connected to the dubbing mode terminal of the function switch and the other side connected to the second position terminal of the second switch, and one side connected to the first magnetic recording and reproducing device side. a second one-way conduction means connected between the first switch and the first mechanism drive motor, and the other one connected to the fixed terminal of the second switch;
One-way conduction means connects the first switch on the first magnetic recording/reproducing device side to the power source via the second position terminal of the second switch when switching the function switch to continuous mode; The second one-way conduction means causes the first switch of the second magnetic recording and reproducing device to be connected to the first switch of the second magnetic recording and reproducing device by ON control of the first switch of the first magnetic recording and reproducing device when switching the dubbing mode of the function switch. Since the power supply is connected, a one-way conduction means is simply provided between the function switch and the mechanism drive motor, so there are fewer parts and the structure is simple.
This type of magnetic recording and reproducing device can be expected to perform various operations and is extremely effective.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a magnetic recording/playback device that is an embodiment of the present invention, and Fig. 2A explains the operation of the magnetic recording/playback device shown in Fig. 1 when the function switch is switched to the dubbing mode side. FIG. 2B is a flowchart illustrating the operation when the function switch is switched to the continuous mode. F1... Function switch, 1... Movable contact, 2, 3... Fixed contact, 4, 5... One-way conduction means (diode), SA... First switch of the first magnetic recording and reproducing device, SB...First switch of the second magnetic recording/playback device, S1...Second switch, P1...Movable contact, P2...Fixed contact at recording or playback position, P3...Fixed position other than recording or playback Contact, S...Motor control device,
P/R... Recording and playback circuit.

Claims (1)

[Scope of utility model registration request] a power source; a function switch selectively connected to the power source for selecting a dubbing mode or a continuous mode; first and second magnetic recording and reproducing devices each having a mechanism driving motor;
and a second magnetic recording/playback device, which are controlled ON/OFF by operations other than the pause operation, and the first
On the side of the magnetic recording/playback device, one side is connected to the dubbing mode terminal of the function switch, and the other side is connected to the motor for driving the mechanism, and on the side of the second magnetic recording/playback device, one side is connected to the continuous mode terminal of the function switch. a first switch, the other of which is connected to a motor for driving the mechanism, and a first position that is the recording or playback position of the head member of the second magnetic recording and playback device, and a second position that is other than the recording or playback position. a second switch responsively switched and having a fixed contact connected to a continuous mode terminal of said function switch, one end connected to a dubbing mode terminal of said function switch and the other end connected to a second position of said second switch; a first one-way conduction means connected to the terminal; one side connected between the first switch on the side of the first magnetic recording and reproducing device and the first mechanism driving motor; and the other side connected to the fixed terminal of the second switch. a second one-way conduction means connected to the first one-way conduction means, and when the function switch is switched to a continuous mode, the first magnetic A first switch on the recording/playback device side is connected to the power source, and a second one-way conduction means controls the first switch of the first magnetic recording/playback device to turn ON when switching the dubbing mode of the function switch. A magnetic recording and reproducing device, wherein the power source is connected to a first switch of the second magnetic recording and reproducing device.