JPH077486B2 - Magnetic recording device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic recording device capable of recording and reproducing information signals on a magnetic recording medium such as a floppy disk.

[Prior Art] FIG. 4 is a block diagram showing a conventional magnetic recording apparatus. In the figure, 1 is a head on the side 0 side, 2 is a head on the side 1 side, 3 is a head switching circuit for switching heads 1 and 2, 4 is a writing circuit for supplying a writing current to the heads 1 and 2, and 5 is this writing circuit 4 A trigger flip-flop (hereinafter referred to as T-FF) connected to the switch 6, a write signal input to the T-FF5, a write current source 7 to be supplied to the write circuit 4, and 8 of the heads 1 and 2 A track counter for knowing position information, 9 is a step signal, 10 is a track 00 signal for notifying that the heads 1 and 2 are on track 00, 11 is a direction signal indicating the moving direction of the heads 1 and 2, and 12 is a head 1 , 2 is selected, and a side switching signal for giving the side switching information to the head switching circuit 3, 13 is the head 1,
It is an inner / outer side switching signal indicating whether 2 is on the inner side or the outer side.

FIG. 3 shows a sectional view of the heads 1 and 2. In the figure, 1
4 is a magnetic recording medium, 15 is a head piece on the side 1 side, 16
Is a side 1 side slider, 17 is a side 1 side erase head, 18 is a side 1 side read / write head, 19 is a side 0 side headpiece, 20 is a side 0 side slider,
21 is the erase head on the side 0 side, 22 is the read / write head on the side 0 side, and 23 is the above read / write head 1.
It is a track where data is written by 8,22.

FIG. 5 is a waveform diagram of each part when writing is performed.

Next, the operation will be described. First, the side switching signal 12
The head switching circuit 3 selects the head 1 on the side 0 side or the head 2 on the side 1 side. Next, based on the position information of the heads 1 and 2 including the step signal 9, the track 00 signal 10, and the direction signal 11, the track counter 8
The inner / outer switching signal 13
Is given to the write current source 7. The write current source 7 sets a write current according to the inner and outer circumferences by the inner / outer circumference switching signal 13, and the write current is supplied to the write circuit 4. Further, the write signal 6 is divided by T-FF5, and this signal switches the write current in the write circuit 4,
A current flows through the head switching circuit 3 to the selected head 1 or 2. In this case, as shown in FIG.
Whether the side switching signal 12 is "H" or "L", the inner / outer peripheral switching signal 13 changes its state at the track m. Further, as shown in the sectional view of the head in FIG. 3, the positions of the read / write heads 18 and 22 on the side 0 side and the side 1 side are deviated in order to prevent the heads from interfering with each other. When the circumference is switched on the track m as shown in the time chart of FIG. 5, the write current is switched on the side 0 side and the side 1 side at a position displaced by several tracks.

[Problems to be Solved by the Invention]

Since the conventional magnetic recording device is configured as described above, it is not possible to switch the write current between the inner and outer circumferences on the same circumference on the front and back sides of the magnetic recording medium, and it is necessary to set the write current for the inner and outer circumferences by several tracks. The margin of
There is a problem that the write currents of the inner and outer circumferences cannot be optimally set.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a magnetic recording device capable of switching the inner and outer circumferences of a write current on the same circumference on the front and back sides of a magnetic recording medium.

[Means for Solving the Problems]

In the magnetic recording apparatus according to the present invention, the signal for switching the write current between the inner and outer circumferences is generated by shifting the signal by the number of tracks in which the heads are displaced between the front and back sides of the magnetic recording medium.

[Action]

In the present invention, the write currents are generated by shifting the inner / outer peripheral switching signals by the number of tracks in which the heads are offset on the front and back sides of the magnetic recording medium. The inner and outer circumferences can be switched.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. First
The figure shows a magnetic recording apparatus according to an embodiment of the present invention. In the figure, 1 is a side 0 side head, 2 is a side 1 side head, 3 is a head switching circuit for switching the above heads 1 and 2, and 4 is a head 1 Write circuit for supplying write current to 2 and 5
Is T-FF connected to the writing circuit 4, and 6 is the above-mentioned T-FF.
A write signal input to FF5, 7 is a write current source to be supplied to the write circuit 4, 8 is a track counter for knowing position information of the heads 1 and 2, 9 is a step signal, 10 is a track of the heads 1 and 2 Track 0 to tell you that it is at 00
0 signal, 11 is a direction signal indicating the moving direction of the heads 1 and 2, 12 is a side switching signal that selects the heads 1 and 2, and gives side switching information to the head switching circuit 3 and the track counter 8, 13 is the above It is an inner / outer circumference switching signal indicating whether the heads 1 and 2 are on the inner circumference or the outer circumference.

FIG. 2 is a waveform diagram showing an inner / outer peripheral switching state at the time of writing.

Next, the operation will be described. First, the side switching signal 12
From the head switching circuit 3, the side 0 side head or the side 1 side head 2 is selected. Next, depending on the position information of the side switching signal 12, the step signal 9, the track 00 signal 10, and the position signals 1 and 2 of the direction signal 11, whether the respective heads 1 and 2 are on the inner circumference or the outer circumference from the track counter 8, The inner / outer circumference switching signal 13 is given to the write current source 7. The write current source 7 is generated by the inner / outer switching signal 13.
The write current is set by and the write current is supplied to the write circuit 4. Further, the write signal 16 is divided by T-FF5, and this signal switches the write current in the write circuit 4, passes through the head switching circuit 3, and the current flows through the selected head 1 or 2.

Here, as shown in the sectional view of the head in FIG. 3, when the read / write heads 18 and 22 are deviated by 4 tracks on the side 0 side and the side 1 side to prevent mutual interference of the heads,
As shown in the time chart in the figure, the write current can be switched between the inner side and the outer side on the track 0 on the side 0 and on the track m + 4 on the side 1 so that the magnetic recording medium has the same write current on the front and back sides. The inner and outer circumferences can be switched, and the optimum setting of the inner and outer circumference write currents becomes possible.

In the above embodiment, as shown in FIG. 3, the read / write heads are deviated by 4 tracks on the sides 0 and 1, but the deviation may be other than 4 tracks.

Further, in the above-described embodiment, the write current is switched between two stages, the inner circumference and the outer circumference, but the write current may be switched in two steps or more, and the same effect as that of the above embodiment is obtained.

Further, in the above-mentioned embodiment, only the case where only the information signal is recorded has been described, but it is naturally applicable to a magnetic recording / reproducing apparatus which records and reproduces the information signal, and has the same effect as the above-mentioned embodiment.

〔The invention's effect〕

As described above, according to the magnetic recording device of the present invention,
Since the write current can be switched between the inner and outer circumferences on the same circumference on the front and back sides of the magnetic recording medium, the setting of the write currents on the inner and outer circumferences can be optimized.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a magnetic recording apparatus according to an embodiment of the present invention, FIG. 2 is a signal waveform diagram showing the operation of the present invention, and FIG. 3 is used for the present invention. FIG. 4 is a sectional view of the head, FIG. 4 is a block diagram of a conventional magnetic recording apparatus, and FIG. 5 is a signal waveform diagram showing the operation of the conventional example. In the figure, 1 is a side 0 side head, 2 is a side 1 side head, 3 is a head switching circuit, 4 is a writing circuit, and 5 is T.
-FF, 7 is a write current source, and 8 is a track counter.

Claims (1)

[Claims] 1. A magnetic recording apparatus for recording an information signal on a magnetic recording medium, wherein write currents are applied to the heads arranged on both sides of the magnetic recording medium so as to be offset from each other by several tracks. A magnetic recording device characterized in that the tracks for switching the inner and outer rims are made different so that the write current is switched between the inner and outer rims on tracks on the same circumference on both sides of the magnetic recording medium.