JP2658090B2 - Magnetic recording / reproducing device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic recording / reproducing apparatus using an electronically controlled rotary head type auto reverse mechanism.

Conventional technology In the mechanism where the recording pause state cannot be obtained while the magnetic tape and the head are in contact due to mechanical restrictions, the conventional method of separating the magnetic tape and the head while applying the erase current and the bias current, or using the erase current Either a method in which the bias current is cut off and the magnetic tape and the head are separated afterward has been adopted. However, in the former case, noise in the audible range is recorded on the magnetic tape, and in the latter case, if such an operation is performed on a pre-recorded magnetic tape, a part that is not erased remains.
A so-called unerased residue occurs. These both cause unpleasant noise when the magnetic tape is reproduced, and impair the quality of the magnetic recording / reproducing apparatus. As a countermeasure for this, a short rewind state is set during the recording pause operation, the magnetic tape is returned before the noise recording part, and the noise recording part is erased when the recording pause state is released and the recording state is resumed. A method of recording a signal has also been devised.

Problems to be Solved by the Invention However, in this method, since the tape diameter is different at the beginning and end of the magnetic tape, the tape is returned to the immediately preceding recording part necessary when the above-mentioned rewinding operation is performed. Was in danger of erasing it.

The present invention relates to a mechanism in which a magnetic tape and a head are separated from each other in a recording pause state due to a restriction on a mechanism design, and noise recorded on the magnetic tape when the head is separated from the magnetic tape while an erasing current and a bias current are applied. Is to be erased.

Means for Solving the Problems In order to solve the above-mentioned problems, in the present invention, when the recording pause operation in the normal rotation direction is performed, the reproduction is set to the reverse playback state for a certain period of time, and then the recording is automatically stopped in the normal rotation direction. Control to return to normal. When a recording pause operation in the reverse direction is performed, normal reproduction is performed in the reverse direction, and then the recording is automatically controlled to a recording pause state in the reverse direction.

According to this configuration, when the magnetic tape is separated from the head while the erasing current and the bias current are being applied from the recording state, noise remaining on the tape is removed by a reproducing operation in the opposite running direction for a predetermined time. When the recording pause state is released and the recording state is resumed, the residual noise portion on the tape can be erased and a new signal can be recorded.

FIG. 1 shows an embodiment of the mechanism control circuit according to the present invention. In FIG. 1, 1 is a rotary head type electronically controlled auto-reverse mechanism, 2 is a control circuit such as a microcomputer or a gate array, etc., 3, 4, 5, 6, 7, 8, and 9 are rewind, reverse playback, and stop, respectively. , Forward playback, fast forward, record, and pause. Reference numeral 10 denotes an oscillation circuit for supplying an erase current and a bias current. Oscillation and oscillation stop are controlled by the above-mentioned control circuit. FIG. 2 shows a main part of a rotary head part of an auto-reverse mechanism used in the present invention. Reference numeral 11 denotes a mechanical substrate, and 12 denotes a magnetic tape. Show. Reference numeral 13 denotes a rotating head block on which an erasing head 14 and a recording / reproducing head 15 are mounted, and about 1 in both directions of arrows F and R in the figure.
It is configured to rotate 80 degrees. A stopper 16 is provided at one location on the circumference of the rotating head block 13. The azimuth in the forward direction is adjusted by rotating the azimuth screw 17 in the forward direction as shown in the figure, and the azimuth screw 18 is adjusted in the reverse direction. Configuration.

FIG. 3 is a flowchart showing a processing procedure of mechanism control and control of an erase current and an oscillator for bias current according to the present invention. If the pause operation is performed in the forward rotation recording state, the process proceeds to processing 20 with YES in judgment 19, and the mechanism is brought into a stopped state in which the magnetic tape and the head are separated by control of a solenoid or the like. Next, in step 21, the oscillator is stopped, and in step 22, the mechanism is also subjected to reverse reproduction under control of a solenoid or the like, and the magnetic tape is slightly rewound. At step 23, the mechanism returns to the stop state, and at 24, oscillation starts again. At 25 as it is, the mechanism is set to pause normal recording, and at decision 26, the recording operation is awaited. When a recording operation such as operating the pause button again is performed, the mechanism starts normal recording at 27.

The processing for temporarily stopping in the reverse recording state can be similarly expressed by 28 to 36.

FIG. 4 shows an example of a bias oscillation circuit for supplying an erasing current and a bias current to the erasing head winding 39, the L channel winding 37 and the R channel winding 38 of the recording / reproducing head, and an example of a control circuit therefor. Reference numeral 40 denotes an oscillation transistor, which constitutes a collector-tuned anti-coupling oscillation circuit using the transistor TR ₁ and connects the base of the power supply control transistor TR ₂ to the control input terminal 4.
And a method of controlling via the transistor TR ₃ than 1. That is, if 41 is at a high potential, TR ₃ and TR ₂ conduct and oscillate, and when 41 changes to the ground potential, oscillation stops. The control input terminal 41 is controlled by the control circuit 2 such as the microcomputer shown in FIG. 1 according to the flowchart shown in FIG.

In the flowchart of FIG. 3, a slight delay time may be provided from YES in the judgment 19 to the processing 20. In this case, when the necessary signal recording is completed and the pause operation is performed immediately, the rewind to the recording section when rewinding as reverse reproduction in steps 22 and 23 and the danger of erasing this part in step 27 can be avoided. Steps 20 and 21 may be reversed. If the oscillation is stopped before the magnetic tape is separated from the head, an unerased portion will be produced. However, since the unerased portion is erased in a subsequent process, no problem occurs.

Effect of the Invention According to the present invention, the unpleasant noise remaining on the magnetic tape in a configuration in which the head is separated from the magnetic tape due to the restriction of the configuration of the mechanism when the recording is temporarily stopped is eliminated by the next recording disclosure by utilizing the feature of the auto reverse mechanism. The effect of maintaining the dignity of the high-end audio equipment is very large. Also, because of the electronic control mechanism of the microcomputer or the like, there is no need to add special electronic components only by adding or changing a program a little, and the industrial effect is great.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a magnetic recording / reproducing apparatus according to the present invention, FIG. 2 is a configuration diagram of a rotary head portion of the apparatus, and FIG. 3 is a processing procedure of mechanism control and oscillation circuit control of the apparatus. FIG. 4 is a circuit diagram showing an example of a bias oscillation circuit of the device. 1 ... Rotating head type auto reverse mechanism, 2 ...
... Control circuit by microcomputer or the like, 3 ... Rewind operation switch, 4 ... Reverse reproduction operation switch, 5 ...
Stop operation switch, 6: Forward rotation operation switch, 7:
... Fast forward operation switch, 8 ... Recording operation switch, 9 ...
... Pause operation switch, 10 ... Bias oscillation circuit.

Claims (1)

(57) [Claims] 1. A rotary head type electronically controlled auto-reverse mechanism, wherein a magnetic tape and a head are separated at the time of a recording pause, and an erasing current and a bias current when a pause operation is performed from a recording state in a normal rotation direction. After the power is turned off, it is set to the reverse playback state for a certain period of time, and then the recording is paused in the normal rotation direction.If the pause operation is performed from the recording state in the reverse direction, the erase current and bias current are cut off and the normal rotation is played for a certain time. A magnetic recording / reproducing apparatus comprising: means for controlling a state in which the recording state is temporarily stopped in a reverse direction after the state is set.