JPS6364817B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic recording/reproducing device having a plurality of tape running mechanism sections, and a magnetic recording/reproducing device having a plurality of tape running mechanism sections, in which a playback signal from one of the plurality of mechanism sections can be recorded by another mechanism section. In addition, it is designed to prevent malfunctions when high-speed playback and recording is enabled in order to shorten the recording time.

Conventionally, in magnetic recording and reproducing devices that have multiple built-in mechanisms and are capable of recording (hereinafter referred to as dubbing) the playback signal from one mechanism in another mechanism, tapes have been used to shorten the dubbing time. Some models are equipped with a high-speed dubbing switch that runs at high speed and performs dubbing.

When performing this high-speed dubbing, simply turning on the high-speed dubbing switch will cause the tape running motors in both mechanisms to rotate at high speed, and the tape will be running at the same speed, so this high-speed dubbing will be terminated. Even if the switch
If you forget to turn it off and perform normal recording without knowing it is turned on, the tape will run at high speed, resulting in recording errors.

The present invention has been made to eliminate such conventional drawbacks, and one embodiment thereof will be described below with reference to the drawings.

1 is the first mechanism part that is used for recording when dubbing, and 2 is the second mechanism part that is used for playback when dubbing.
This is the mechanism part.

_M1 is a motor for running the tape of the first mechanism section 1, and _N1 is a rotation speed switching circuit for the motor _M1 . Also, M ₂ is the second mechanism part 2
N 2 is the motor for running the tape, and N ₂ is the motor M ₂
This is a rotation speed switching circuit. When H level voltage is applied to the control terminals a ₁ and a ₂ of these rotational speed switching circuits N ₁ and N ₂ , the motors M ₁ and M ₂ are rotated at normal speed and the tape speed is set at the low rated speed. On the other hand, when an L level voltage is applied to the control terminals a ₁ and a ₂ , the motors M ₁ and M ₂ are rotated at a high speed, and the tape is run at a high rated speed.

_S1 is a first switch that is linked to the recording/playback switching operation of the first mechanism section 1, and the illustrated state is the playback state. S ₂ switches the recording signal source of the first mechanism section 1 between normal recording such as line input or microphone, and so-called dubbing recording, which records the playback signal from the second mechanism section 2. The illustrated state is the normal recording state. _S3 is a third switch that is switched in conjunction with the operation for selecting the tape running speed between normal speed and high speed, and the illustrated state is the normal speed state. Further, S ₄ is the fourth part that is closed when the regeneration operation of the second mechanism part 2 is started.
This is a switch that closes when playback is started directly from a stopped state, or when playback is performed from a stopped state and the playback is performed via a paused state, the playback start operation closes the playback operation. . In other words, it is closed even when paused.

R ₁ to R ₆ are resistors, and D ₁ and D ₂ are diodes.
A series circuit of resistors R ₁ , R ₂ , R ₃ and a series circuit of resistors R ₄ , R ₅ , R ₆ are connected between power supply E and ground, respectively.
The anode of the diode D ₁ is connected to the connection between the resistors R ₁ and R ₂ , and the anode of the diode D ₂ is connected to the connection between the resistors R ₄ and R ₅ . The cathodes of the diodes D ₁ and D ₂ are connected to each other, and a series circuit of first to fourth switches S ₁ to _{S 4} is connected between the cathodes and the ground. The connection between resistors R ₁ and R ₃ (point A) is connected to the control terminal a ₁ of the rotation speed switching circuit N ₁ , and the connection between resistors R ₅ and R ₆ (point B).
is connected to control terminal _a2 of rotation speed switching circuit _N2 .

Note that the resistors R ₁ to R ₆ are connected to the potentials at points A _and B, respectively, when _{the diodes D 1 and D 2 are conductive .} ( _R2
+R ₃ ) = V _D × R ₆ / (R ₅ + R ₆ )} is equal to the L level input potential of the rotation speed switching circuits N ₁ and N ₂ , and when the diodes D ₁ and D ₂ are non-conducting. A
Potential at point and point B {E×R ₃ /(R ₁ +R ₂ +R ₃ )=E
×R ₁ /(R ₄ +R ₅ +R ₆ )} is set to be sufficiently higher than the L-level potential, and the rotation speeds of motors M ₁ and M ₂ are set to normal speed rotation.

With the above configuration, when all the first to fourth switches _S1 to _S4 are turned on, that is, the first mechanism part 1 is in the recording state and the second mechanism part 2 is in the playback state. In addition, when dubbing is selected and high-speed dubbing is selected, the potentials at points A and B are at L level, so the rotation speed switching circuit
Since an L level potential is applied to the control terminals a ₁ and a ₂ of N ₁ and N ₂ , the motors M ₁ and M ₂ are rotated at a high speed, and the tape is run at a high rated speed to perform high-speed dubbing. It will be done.

On the other hand, if even one of the first to fourth switches _S1 to _S4 is OFF, the potentials at points A and B become H level, and motors _M1 and _M2 rotate at normal speed. Because of this, the tape is not run at high speed.

This means, for example, that the first mechanism part 1 is in the recording state, and the second switch S ₂ and the third switch
Even if S ₃ is in the ON state, if the second mechanism section 2 is not in the regeneration state, the fourth switch S ₄ is turned ON.
Therefore, during the recording operation of the first mechanism section 1 alone, the tape is not run at high speed.Therefore, when normal recording is performed with this first mechanism section 1, there is a risk of erroneous recording such as the tape being erroneously run at high speed. is to be prevented.

Note that the first mechanism section 1 may be capable of reproduction, and the second mechanism section 2 may be capable of recording.

As described above, the present invention has a simple configuration that prevents the tape from being erroneously run at high speed when performing normal recording in which a line input signal or microphone signal is recorded using only one mechanism part out of a plurality of mechanism parts. This eliminates this problem and prevents recording mistakes, which is very effective.

[Brief explanation of drawings]

The figure is a circuit diagram showing one embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...First mechanism part, 2... Second mechanism part, _N1 , _N2 ...Rotation speed switching circuit, S1 _~
S ₄ ... Switch, R ₁ to _{R 6} ... Resistance, D ₁ , D ₂ ...
diode.

Claims (1)

[Claims] 1. It has at least a first mechanism section and a second mechanism section that are capable of switching a tape running motor to a normal speed and a high speed, respectively, and switches the first mechanism section to a recording state. A first switch that is switched in conjunction with the operation, a second switch that is switched in conjunction with the operation that selects the recording signal source of the first mechanism section as the playback signal of the second mechanism section, and a third switch that is switched in conjunction with an operation to select a running speed between a normal speed and a high speed; and a fourth switch that is switched in response to an operation to start regeneration of the second mechanism section, the first switch being It is switched by switching the first mechanism section to the recording state, the second switch is switched by selecting the recording signal source of the first mechanism section as the reproduction signal of the second mechanism section, and the third switch is switched. The respective motors are configured to rotate at a high speed only when the tape running speed is switched to a high speed and the fourth switch is switched by a playback start operation of the first mechanism section. A magnetic recording/reproducing device characterized by: