JP2588319Y2 - Magnetic head - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head suitable for use in a digital magnetic recording medium having a square recording current waveform, such as a floppy disk and a hard disk.

[0002]

2. Description of the Related Art Conventionally, a magnetic head has been used for a digital magnetic recording medium such as a floppy disk and a hard disk, in which a recording current waveform is a square wave, and a recording / reproducing coil of the magnetic head is as shown in FIG. Configuration. The operation of this coil is described approximately as follows. First, at the time of recording, the current flowing from the terminal 2c flows toward the terminal 2a or the terminal 2d according to the recorded data, thereby generating an alternating magnetic field required for recording. At the time of reproduction, the reproduction is performed by the terminals 2a and 2d.

In addition, one new terminal is provided between the terminal at both ends of the coil and the terminal at the center, and two new terminals are used at the time of recording, and at the time of reproduction, There has been proposed a coil in which terminals are used for recording and reproduction, such as using terminals at both ends of the coil.

[0004]

However, when a conventional magnetic head is used at a low power supply voltage for reasons such as low power consumption of the apparatus, the rising time t of the recording current shown in FIG. A good recording state cannot be secured on the medium. This problem has become particularly important in recent years, as the frequency has tended to increase.

Therefore, it is necessary to reduce the number of turns of the coil and avoid an increase in the rise time. However, when the number of turns of the coil is reduced, the output voltage at the time of reproduction is also reduced. Therefore, the setting of the number of turns is performed by finding a compromise. Also, in order to obtain good recording despite the long rise time, the dimensions of each part of the head core had to be more precisely finished.

On the other hand, in order to solve these problems, in a coil as described above, that is, in a coil provided with two terminals in addition to a conventional coil, the number of terminals is increased. There are problems that the structure becomes complicated and manufacturing is difficult, and the time and labor for wiring and the like increase.

The present invention has been made in view of such a problem, and has a simple structure. The recording current waveform can be improved by using a coil having a small number of turns at the time of recording, and the number of turns at the time of reproduction can be improved. It is an object of the present invention to obtain a magnetic head capable of securing a high output by using the above coil.

[0008]

SUMMARY OF THE INVENTION The magnetic head of the present invention comprises:
For example, as shown in FIG. 1, the winding start terminal of the coil
And the number of windings from the terminal at the end of the winding of the coil are equal
The terminal is provided in a new center position, and these three terminals are used.
And the number of windings from the terminal at this center position
And the terminal where the number of windings from the terminal at the beginning of winding is equal
With a coil to record using these three terminals
Things. In addition, the magnetic head of the present invention
Number of windings from the terminal at the beginning of winding and the terminal at the end of winding of the coil
From the center position where the number of windings is equal to
Play using the three terminals, and the end of this center position
The number of windings from the terminal and the number of windings from the terminal at the end of winding are equal
A terminal in a new position and record using these three terminals
It has a coil that changes. In addition, the magnetic head of the present invention
The number of windings from the terminal at the beginning of winding of the coil
From the terminal at the end of the
Set up a terminal at the position, play using these three terminals,
And the number of windings from the terminal at this
Terminal at a position approximately equal to the number of windings from the terminal.
Have a coil that records using these three terminals
Things. In addition, the magnetic head of the present invention employs a coil winding.
Number of windings from the first terminal and whether the terminal at the end of the coil
A terminal is provided at a substantially central position where the number of windings is almost equal to
Playback using these three terminals
And the number of windings from the terminal at the position
Terminals are provided at positions almost equal to the number of wires, and these three
It has a coil for recording using a child. Also,
The magnetic head of the present invention has a coil winding terminal and a coil.
The first terminal is provided between the terminals at the end of
And play it back with the first terminal
A second terminal is provided between the three terminals, and these three terminals are used.
And a coil for recording the Also, the present invention
The magnetic head has a coil start terminal and coil end terminal.
A first terminal is provided between the other terminals, and these three terminals
And the first terminal and the end of the winding
A second terminal between the children and use these three terminals
Those having a coil to be recorded.

[0009]

According to the magnetic head of the present invention, a terminal is provided at a central position where the number of windings from the terminal at the beginning of winding of the coil 1 is equal to the number of windings from the terminal at the end of winding of the coil 1, and A magnetic head having a coil 1 provided with a terminal at a position where the number of windings from the terminal at the center and the number of windings from one of the terminals at the beginning and end of the winding is equal to each other, By using coils with different numbers of turns during recording and playback, the recording current waveform can be improved by using coils with a smaller number of turns during recording, and high output by using a coil with a larger number of turns during playback Can be secured. This is particularly effective for a magnetic head used in a digital magnetic recording device such as a floppy disk drive in which the recording current waveform is a square wave.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the magnetic head of the present invention will be described below with reference to FIGS. FIG. 1 shows that a terminal is provided at a central position where the number of windings from the terminal at the beginning of winding of the coil 1 is equal to the number of windings from the terminal at the end of winding of the coil 1, and
This figure shows a magnetic head having a coil 1 provided with a terminal at a position where the number of windings from the terminal at the center and the number of windings from one of the terminals at the beginning and end of the winding are equal. Things.

This coil is the same as the conventional recording / reproducing coil shown in FIG. 4 except that a terminal 2b is provided between terminals 2a and 2c as shown in FIG. Here, the number of windings of the coil between the terminals 2a and 2b and the number of windings of the coil between the terminals 2b and 2c are the same. That is, the terminal 2b is located at the center between the terminals 2a and 2c.

Next, a description will be given of how the terminals are used during recording and reproduction. First, at the time of recording, as shown in FIG. 2, the terminal 2d is opened, and recording is performed using the terminal 2a, the terminal 2b, and the terminal 2c. Next, at the time of reproduction, the wiring is switched, and as shown in FIG.
Is in an open state, and reproduction is performed using the terminals 2a, 2c, and 2d.

From the above, according to the present embodiment, the coil 1
A terminal is provided at a central position where the number of windings from the terminal at the beginning of winding and the number of windings from the terminal at the end of winding of the coil 1 are equal. A magnetic head having a coil 1 having a terminal provided at a position where the number of windings from one of the first terminal and the last terminal is equal to that of the terminal, and using coils having different numbers of windings during recording and reproduction Thus, even when a magnetic head is used at a low power supply voltage, the use of a coil having a small number of turns at the time of recording can shorten the rise time t of the recording current and ensure a good recording state on the medium. At the same time, a high output can be ensured by reproducing using a coil having a large number of turns. This is particularly effective for a magnetic head used in a digital magnetic recording device such as a floppy disk drive in which the recording current waveform is a square wave. Further, since a good recording current is obtained, the dimensional tolerance of the head core can be set wide. Further, it is possible to easily cope with a further reduction in power supply expected in the future. In addition, for the above-described center tap fixed type coil, that is, a conventional coil having terminals at both ends of the coil and the center thereof, a new terminal is provided between the terminal at the beginning of winding and the terminal at the center, In comparison with a coil in which a new terminal is provided between the terminal at the end of winding and the terminal at the center, the number of terminals can be reduced by one in the coil of the present example. Therefore, as compared with the center tap fixed type coil, in the coil of the present example, by reducing the number of terminals, the structure can be simplified and the manufacturing can be facilitated. Can be reduced.

It should be noted that the present invention is not limited to the above-described embodiment, but can adopt various other configurations without departing from the gist of the present invention.

[0015]

[Effects of the Invention] As described above, according to the present invention,
Even when a magnetic head is used at a low power supply voltage, by using a coil having a small number of turns at the time of recording, the rising time t of the recording current can be shortened, and a good recording state can be ensured on the medium, and moreover, High output can be ensured by performing reproduction using a coil having the number of turns. This is particularly effective for a magnetic head used in a digital magnetic recording device such as a floppy disk drive in which the recording current waveform is a square wave. Further, since a good recording current is obtained, the dimensional tolerance of the head core can be set wide. Further, it is possible to easily cope with a further reduction in power supply expected in the future. Also,
For the above-described center tap fixed type coil, that is, a conventional coil having terminals at both ends of the coil and the center thereof, a new terminal is provided between the terminal at the beginning of winding and the terminal at the center, Compared to a coil in which a new terminal is provided between the terminal at the end and the terminal at the center, the number of terminals can be reduced by one in the coil of this example. Therefore, as compared with the center tap fixed type coil, in the coil of the present example, by reducing the number of terminals, the structure can be simplified and the manufacturing can be facilitated. Can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a coil used in the magnetic head of the present invention.

FIG. 2 is a diagram showing terminals used during recording.

FIG. 3 is a diagram showing terminals used during reproduction.

FIG. 4 is an explanatory diagram showing wiring of a conventional recording / reproducing coil.

FIG. 5 is a diagram showing a recording current waveform.

[Explanation of Signs] 1 Coil

Claims (6)

(57) [Scope of request for utility model registration] 1. The number of windings from a terminal at the beginning of winding of a coil,
A terminal is provided at the center position where the number of windings is equal from the terminal at the end of winding of the coil, reproduction is performed using these three terminals, and the number of windings from the terminal at the center position and the terminal at the beginning of winding A magnetic head comprising: a terminal provided at a position where the number of windings is equal to the number of windings; and a coil for recording using these three terminals. 2. The number of windings from a terminal at the beginning of winding of the coil,
A terminal is provided at the center position where the number of windings is equal to the terminal at the end of winding of the coil, reproduction is performed using these three terminals, and the number of windings from the terminal at the center position and the terminal at the end of winding A magnetic head comprising: a terminal provided at a position where the number of windings is equal to the number of windings; and a coil for recording using these three terminals. 3. The number of windings from a terminal at the beginning of winding of the coil,
A terminal is provided at a substantially central position where the number of windings is substantially equal to the terminal at the end of winding of the coil, reproduction is performed using these three terminals, and a winding from the terminal at the substantially central position is provided. A magnetic head comprising: a terminal provided at a position where the number is substantially equal to the number of windings from a terminal at the start of winding; and a coil for recording using the three terminals. 4. The number of windings from a terminal at the beginning of winding of the coil,
A terminal is provided at a substantially central position where the number of windings is substantially equal to the terminal at the end of winding of the coil, reproduction is performed using these three terminals, and a winding from the terminal at the substantially central position is provided. A magnetic head comprising: a terminal provided at a position where the number is substantially equal to the number of windings from a terminal at the end of winding; and a coil for recording using the three terminals. 5. A first terminal is provided between a terminal at the beginning of winding of the coil and a terminal at the end of winding of the coil, reproduction is performed using these three terminals, and the first terminal and the terminal at the beginning of winding are provided. A magnetic head provided with a second terminal between the coils, and a coil for recording using the three terminals. 6. A first terminal is provided between a terminal at the beginning of winding of the coil and a terminal at the end of winding of the coil, reproduction is performed using these three terminals, and the first terminal and the terminal at the end of winding are provided. A magnetic head provided with a second terminal between the terminals and a coil for recording using the three terminals.