JPH02782B2 - - Google Patents

Description

[Detailed description of the invention] Industrial applications The present invention relates to a magnetic recording/reproducing device.

Conventional structure and its problems Conventionally, in order to record an information signal using a cassette deck, the recording command push button was first pressed to activate only the amplification system such as the recording amplifier, and the recording level was set to an appropriate value while monitoring the recording signal. and after this,
A recording command push button and a tape constant speed running command push button are pressed to bring the magnetic head into contact with the magnetic tape, operate a bias oscillation circuit, and run the tape at a constant speed to perform a recording operation. There is.

In the above-mentioned conventional configuration, when the recording command push button and the tape constant speed running command push button are pressed to instruct a recording operation, the magnetic head does not operate until the normal oscillation state is reached after bias oscillation is started. In order to prevent recording with poor electrical characteristics due to contact with the tape, the start point of bias oscillation is brought forward, and after sufficient oscillation output due to normal oscillation operation has been applied to the magnetic head, this magnetic head is The head was supposed to be in contact with the tape. This configuration has the disadvantage that the magnetic head to which a sufficient bias oscillation output is applied comes into contact with the tape, and click noise is recorded on the tape.

To overcome this drawback, it would be possible to activate the bias oscillation circuit after the magnetic head comes into contact with the tape, and such a proposal has been made, but this method does not make it possible to speed up the start-up of the recording operation. .

OBJECTS OF THE INVENTION It is an object of the present invention to make the start-up of a recording operation as early as possible and to prevent click noise from being recorded at the beginning of recording.

Structure of the Invention The present invention includes a push button for recording commands, a push button for tape constant speed running commands, a push button for temporary stop commands, an amplifier,
A head board drive means for advancing a head board on which a magnetic head is mounted, a tape constant speed running drive means for running the tape at a constant speed, and a bias oscillation circuit for supplying a bias current to the magnetic head. When the pause command push button is pressed, only the head board drive means is operated to move the magnetic head forward, and when the recording command push button is pressed in the stopped state, the amplifier, head board drive means, The bias oscillation circuit is activated and the magnetic head is advanced to the same position as when the pause command push button was pressed. When the tape run command push button is pressed in this state, the tape constant speed drive means is activated and the tape is moved forward. The object of the present invention is to provide a magnetic recording/reproducing device which is constructed so that the magnetic head is run at a constant speed, and which has a quick start-up in the recording operation and which hardly records click noise.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the figure, 1 is a push button switch for tape constant speed running command, 2 is a push button switch for temporary stop command,
3 is a push button switch for recording commands, and 4 is a push button switch for stopping commands. Each of these push button switches 1~
4 is a non-locking type, and is turned on only while operating force is applied. 5 is a first flip-flop circuit for storing tape constant speed running commands, 6 is a second flip-flop circuit for storing pause memory, and 7 is a third flip-flop circuit for storing recording commands. , the third flip-flop circuits all operate in negative logic.

One contacts of the push button switches 1 to 4 are all grounded, and the other contact of the push button switch 1 for tape constant speed running command is connected to the set terminal S of the first flip-flop circuit 5 and the diode 8. It is connected to the reset terminal R of the second flip-flop circuit 6 via the cathode and anode.

The other contact point of the push button switch 2 for temporary stop command is connected to the set terminal S of the second flip-flop circuit 6, and is connected to the set terminal S of the second flip-flop circuit 6 through a diode 9.
It is connected to the reset terminal R of the flip-flop circuit 5. The other contact of the recording command push button switch 3 is connected to the set terminal S of the third flip-flop circuit 7 and also to the set terminal of the second flip-flop circuit 6 via a diode 10.

The other contact of the stop command push button switch 4 is connected to the reset terminal R of the third flip-flop circuit 7 via a diode 11, to the reset terminal R of the second flip-flop circuit 6 via a diode 12,
It is connected to the reset terminal R of the first flip-flop circuit 5 via a diode 13.

The first and second flip-flop circuits 5 and 6
The output terminal Q of is connected to the control circuit 14. 1
Reference numerals 5 and 16 denote constant speed tape running drive means and head board drive means which are operated by control signals from the control circuit 14, and when the Q output of the first flip-flop circuit 5 is input to the control circuit 14, The two driving means 15 and 16 operate together,
When the Q output of the second flip-flop circuit 6 is input, only the head board driving means 16 is configured to operate.

The constant speed tape running drive means 15 works to press the pinch roller against the capstan by the force of a plunger or motor, for example, and the head board drive means 16 moves the head board on which the magnetic head is mounted by the force of a plunger or motor. It is moved forward by force, and its specific configuration will be omitted since it is not directly related to the present invention.

17 is a light emitting diode for indicating tape constant speed running (for displaying playback); 18 is a light emitting diode for indicating a pause; and 19 is a light emitting diode for recording. These light emitting diodes are turned on by a signal from the control circuit 14. It's getting old. 20 is a recording signal input terminal, 21 is a recording/reproducing amplifier, and 22 is an output terminal, from which a recording monitor output is output during recording, and a reproduction signal is output during reproduction. The recording/reproducing amplifier 21 is composed of an amplifier 21a and relay changeover switches S ₁ , S ₂ , and S ₃ , and the relay changeover switches S ₁ , S ₂ , and S ₃ are interlocked by the output of the delay circuit 14 a of the control circuit 14 . can be switched. In the regeneration state, the relay changeover switches S ₁ , S ₂ , and S ₃ are connected to terminals S _{1b and} S 3 , respectively, as shown by solid lines in FIG.
A reproduction signal from a magnetic head 23 connected to S _2b and S _3b and used for both recording and reproduction is outputted from an output terminal 22 via a relay changeover switch S ₁ , an amplifier 21a, and a relay changeover switch S ₃ . On the other hand, in the recording state, the relay changeover switches S ₁ , S ₂ , and S ₃ are connected to the terminals S _1a , S _2a , and S _3a , respectively, as shown by the broken lines, and the signal is applied to the recording signal input terminal 20 . The recorded signal is output as a recording monitor output from the output terminal ₂₂ from the terminal S1a of the relay changeover switch _S1 via the relay changeover switch _S3 , and is outputted as a recording monitor output from the output terminal 22 of the relay changeover switch _S1 , the amplifier 21a, and the relay changeover switch S1.
It is supplied to the magnetic head 23 via _S2 . The amplifier 21a can be composed of an operational amplifier and an auxiliary circuit, and the equalization characteristics and gain during recording and reproduction can be switched by the auxiliary circuit.

As described above, the recording and reproducing amplifier 21 changes into the reproducing state according to the output of the delay circuit 14a of the control circuit 14.
Recording states are mutually switched. For example, the Q output of the third flip-flop circuit 7 is connected to the control circuit 14.
After a certain period of time determined by the delay circuit 14a, the recording/reproducing amplifier 21 is switched to a recordable state, and its output is sent to the magnetic head 2.
3 is applied.

The magnetic head 23 and the erase head 24 are connected to the output end of a bias oscillation circuit 25. The control end 25a of this bias oscillation circuit 25 is grounded via a transistor 26, and the output of the third flip-flop circuit 7 is connected to the base of this transistor 26 through a delay circuit 27 consisting of resistors R ₁ and R ₂ and a capacitor C. It is now being supplied through.

The operation of the above embodiment will now be explained.
First, when the tape constant speed running command push button switch 1 is pressed from a stopped state, the first flip-flop circuit 5 is set and the level of its output terminal Q is inverted from "L" to "H". This "H" level is inputted to the control circuit 14 as the Q output of the first flip-flop circuit 5 mentioned above, and the output of the control circuit 14 puts the apparatus into a constant tape running operation state. At this time, the light emitting diode 17 for indicating tape constant speed running is lit. Note that when the tape constant speed running command push button switch 1 is pressed, a reset input is given to the second flip-flop circuit 6.
The constant speed tape running drive means 15 and the head board drive means 16 remain in operation.

Further, when the temporary stop command push button switch 2 is pressed in the stopped state, the second flip-flop circuit 6 is set and the level of its output terminal Q is inverted from "L" to "H". This "H" level is input to the control circuit 14 as the Q output of the second flip-flop circuit 6 mentioned above, and the head board driving means 1
6 is activated to move the head board forward, the magnetic head on the head board comes into contact with the tape, and enters a standby state ready for the next operation (for example, constant speed running operation). At this time, the temporary stop display light emitting diode 18 lights up. Even if the first flip-flop circuit 5 is set, a reset input is applied to the first flip-flop circuit 5 when the pause command push button switch 2 is pressed.

Next, the pause command push button switch 2 is pressed to bring the magnetic head into contact with the tape, which is the standby state (tape constant speed running state), and then the pause command push button switch 2 is pressed to change the standby state (tape constant speed running state). In the same state), when the push button switch 1 for tape constant speed running command is pressed, the level of the output terminal Q of the first flip-flop circuit 5 changes from "L" to "H".
At the same time, a reset input is applied to the second flip-flop circuit 6 via the diode 8, and the level of the output terminal Q of the second flip-flop circuit 6 is inverted from "H" to "L". When these outputs are input to the control circuit 14, the head board driving means 16, which was already in operation, remains in its operating state, and the tape constant speed running drive means 15 enters its operating state, so that the tape is in a constant speed running state. Transition. At this time, the light emitting diode 18 for temporary stop display
is turned off, and the light emitting diode 17 for indicating tape constant speed running is turned on.

As is clear from the above description, in the apparatus of this embodiment, when a tape constant speed operation is performed from a stopped state, tape constant speed running is immediately performed, and when a temporary stop operation is performed while the tape is running at a constant speed, tape running is stopped. The stopped magnetic head enters a temporary state when it comes into contact with the tape, and the tape continues to run at a constant speed in either this paused state or the paused state created by performing a pause operation from the stopped state. When the command push button switch 1 is pressed, the temporary stop state is canceled and the tape runs at a constant speed.

Next, the case where the recording command push button switch 3 is pressed from the stopped state will be explained using the timing chart of FIG. 2.

When the recording command push button switch 3 is pressed at time _t0 , the third flip-flop circuit 7 is set by the recording command A, and the level of its output terminal changes from "H" to "L". At the same time, a second flip-flop circuit 6 is connected via a diode 10.
is set and its output terminal Q goes to the "H" level. As a result, from time _t0 , head board driving means 1
6 starts to be driven, but the magnetic head 23 actually comes into contact with the tape at time _t9 , which will be described later. Note that the tape does not run and remains stopped until the next command B is input.

At the time _t0 , the set output from the output terminal Q of the third flip-flop circuit 7 is output to the control circuit 14.
is input. Therefore, due to the action of the delay circuit 14a, the recording/reproducing amplifier 21 is switched to the recording state as described above at time _t1 after a certain period of time. Note that after time _t1 , recording monitoring becomes possible through the output of the output terminal 22.

Furthermore, the "L" level output from the output terminal of the third flip-flop circuit ₇ , which is output at the time t0, is supplied to the base of the transistor 26 via the delay circuit 27, and is determined by the time constant of the delay circuit 27. After a certain period of time delay, the transistor 26 changes from on to off, and the bias oscillation circuit 25 changes at time t ₂
The operation starts at (t ₁ < t ₂ ). This bias oscillation circuit 25 starts operating (oscillating) at _t2 , but it takes time to reach a normal oscillation state. The time when this normal oscillation state is reached is _t3 . In this embodiment, the magnetic head 23 is brought into contact with the tape by the head board driving means ₁₆ , which is started at the time t0, at time _t9 , and the bias oscillation circuit 25 is brought into a normal oscillation state at the oscillation start time _t2 . It is set during the time t ₃ (t ₂ < t ₉ < t ₃ ). Note that the magnetic head 23 comes into contact with the tape at time _t9 ;
At _t9 , the bias oscillation output is not sufficiently large, so no click noise is recorded on the tape.

To explain only the operating state in accordance with the above time, when the recording command push button switch 3 is pressed at time _t0 , the recording/reproducing amplifier 21 is switched to the recording state at time _t1 after a delay time by the delay circuit 14a. Furthermore, after a delay time by the delay circuit 27 from time t ₀ , the bias oscillation circuit 25 starts oscillating at time t ₂ . Next, the magnetic head 23 on the head board, which had started moving forward from time _t0 , comes into contact with the tape at time _t9 . Thereafter, at time _t3 , the bias oscillation circuit 25 enters a normal oscillation state and applies a sufficient bias output to the magnetic head 23. In this case, both the temporary stop display light emitting diode 18 and the recording display light emitting diode 19 are lit.

The state after the above time _t3 , that is, the tape remains stationary without running, the magnetic head 23 is in contact with the tape, the bias oscillation circuit 25 is in a normal oscillation state, and the recording/reproducing amplifier 21 is switched to record. When the tape constant speed running command push button switch 1 is pressed at time _t4 in the standby state where recording and monitoring are also possible, the second flip-flop circuit 6 is reset by the tape constant speed running command B and Since the first flip-flop circuit 5 is set, the tape starts running at a constant speed, and the apparatus enters the recording operation state.

When the stop command push button switch 4 is pressed at time _t5 in this recording operation state, all the flip-flop circuits in the set state are reset by the stop command C, and the apparatus is brought to a halt state. In this case, the bias output is delayed by a certain period of time due to the action of the delay circuit 27 and becomes 0 at time _t6 . The switching of the recording and reproducing amplifier 21 to the reproducing state is also carried out at time _t7 with a certain time delay due to the action of the delay circuit 14a. and time t ₈
At this point, the magnetic head 23 completely returns to the stop position.

In this way, in the apparatus of this embodiment, when the recording command push button switch 3 is operated, the recording/reproducing amplifier 21 and the bias oscillation circuit 25 are activated sequentially at time _t1 and _t2 , and the head board is temporarily stopped at time _t9 . When the magnetic head 23 and the tape are brought into contact with each other, recording can be monitored in this state and the recording standby state is set. Next, when the push button switch 1 for commanding tape constant speed running is operated, the tape is immediately pressed. The startup of the recording operation is accelerated so that the recording operation starts normally. Moreover, the output of the bias oscillator 25 is delayed by a certain period of time from the recording command A (time t ₀ ), and gradually rises from time _{t 2} after the magnetic head 23 is switched to the recording side at time t 1 . t ₅ ), and then at time t ₆
Recording/reproducing amplifier 2 at time t ₇ after becoming 0 at
1 can be switched to the playback side. Therefore, when the magnetic head 23 and the tape come into contact at time _t9 , the bias oscillation circuit 25 starts oscillating at time _t2 but does not generate sufficient output, so a large click noise is recorded on the tape. never be done. Further, when the recording/reproducing amplifier 21 is switched to the recording side or the reproducing side (time t ₁ ,
_t7 ), the magnetic head 23 is not in contact with the tape, so even if pulse-like noise occurs during this switching, it will not be recorded on the tape as click noise.

FIG. 3 shows an example of the development of the apparatus of the above embodiment, which is suitable for starting a recording operation using a timer. Here flip-flop 5,
6 and 7 operate with negative logic, similar to those shown and explained in FIG. 30 is a timer recording switch, which enables timer recording when turned on. Reference numeral 28 denotes a switch that is turned off for a certain period of time after the power is turned on only during timer recording.This switch 28 causes the circuit 29 to output one pulse at the "L" level for a predetermined period of time from the time the power is turned on, and then outputs one pulse at the "H" level. It turns on after returning to . Note that the switch 28 remains on when the timer recording is not performed.

In the case of timer recording, that is, when the power is turned on to the device with the switch 30 closed, the flip-flop circuits 5 and 7 are connected to the diode 3 by the circuit 29.
Since it is pulled to the "L" level via signals 1 and 32, it is set and enters the recording operation state. At this time, the switch 28 remains off for a certain period of time when the power is turned on, and then turns on (after the output of the circuit 29 reaches the "H" level), so the second flip-flop circuit 6 is set. It will never be in a suspended state. It goes without saying that the functions of the diode 10 and the switch 28 in the above embodiment can be easily achieved by using software using a microcomputer or the like. Further, in the above embodiment, the temporary stop position and the constant speed running position (playback position) of the head are explained in the same way, but it goes without saying that the temporary stop position may be a position slightly retracted from the tape.

Effects of the Invention According to the magnetic recording/reproducing apparatus of the present invention, by operating only the recording command push button, the head board enters the recording standby state in which it moves forward, and it is also possible to monitor the recording signal.
In addition, the bias oscillation circuit is also activated, especially after the bias oscillation circuit starts oscillating.
By bringing the tape into contact with the magnetic head until a normal oscillation state is reached, large click noises are not recorded on the tape. In addition, by simply operating the recording command push button, the head board moves forward and enters the recording standby state, so that by the time the next tape running command is issued, the bias oscillation circuit has already reached normal oscillation operation, preventing any pinch. Recording can be started with a slight mechanical action such as pressing the roller against the capstan, and the start-up characteristics at the start of recording can be greatly improved. Furthermore, it has various effects such as being able to monitor recording by operating only the recording command push button, and being able to start recording by simply operating the tape constant speed running push button, improving operability. Obtainable.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing one embodiment of the present invention, Figure 2 is a circuit diagram showing an embodiment of the present invention.
The figure is a timing chart explaining the operation, and FIG. 3 is a circuit diagram showing another embodiment of the present invention. 1...Push button switch for tape constant speed running command, 2
...Push button switch for temporary stop command, 3...Push button switch for recording command, 4...Push button switch for stop command, 5-7...Flip-flop circuit, 14...
Control circuit, 21... Recording/reproducing amplifier, 25...
...Bias oscillation circuit, 30...Timer recording switch.

Claims (1)

[Claims] 1 A push button for recording commands, a push button for commanding tape constant speed running, a push button for temporary stop command, an amplifier, a head board driving means for advancing the head board on which the magnetic head is mounted, and a push button for running the tape at constant speed. A constant speed tape running drive means is provided, and a bias oscillation circuit supplies a bias current to the magnetic head, and when the pause command push button is operated in a stopped state, the magnetic head is moved to a position where the magnetic head contacts the tape. Only the head board driving means is actuated to move the tape forward and the head board driving means is temporarily stopped, and when the tape constant speed running command push button is operated in the stopped state, both the tape constant speed running driving means and the head board driving means are actuated. When the tape constant speed running command push button and the recording command push button are operated, the tape constant speed running driving means, the head board driving means, the amplifier and the bias oscillation circuit are operated, and the recording state is set. In a magnetic recording/reproducing device configured such that when the above-mentioned pause command push button is operated in this playback state or recording state, the playback pause state or recording pause state is set, in which only the record command push button is operated in the stopped state. When this happens, after the amplifier is switched to the recordable state, the bias oscillation circuit starts operating and the output gradually rises.At the same time, the magnetic head activates the pause command push button. The head board driving means is operated so that the magnetic head is advanced to the same position as when the magnetic head was operated, and the bias oscillation circuit is brought into normal oscillation operation after the magnetic head and tape come into contact. After the operation, when the tape constant speed running command push button is operated, the tape constant speed running driving means is activated to set the tape to a recording state in which the tape is running at a constant speed, and when a stop operation is performed from this recording state, the bias oscillation circuit is activated. 1. A magnetic recording and reproducing apparatus, comprising a control means for controlling the operation of the amplifier so that the amplifier is switched to a reproducing enabled state after stopping its operation.