JPS63140404A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To prevent the generating of data destruction and to obtain a good overwriting characteristic by absorbing an inductive voltage to occur at other coil side for recording and reproducing when a recording current is fed to one side coil for recording and reproducing from a recording and reproducing circuit. CONSTITUTION:When recording currents i1 and i2 flow at one side coil 4 for recording and reproducing, a magnetic field for recording occurs at a head core 3 where the coil 4 for recording and reproducing is wound, and a prescribed signal is recorded at a recording medium 1. The leaking part of a magnetic field for recording to occur simultaneously is interlinked with other coil 12 for recording and reproducing, a diode pair 18 is serially connected to a damping resistance 16 while an inductive voltage e1 occurs by this, the inductive current to flow at the coil 2 for recording and reproducing is limited by these diodes, and the inductive magnetic field to occur at other head core 11 is made smaller. Thus, the recording surface of the recording medium 1 does not come to the data destruction, and by increasing the recording current to flow at the coil for recording and reproducing, the overwriting characteristic can be made good.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device (hereinafter referred to as FDD) using, for example, a narrow gap head.

[Prior Art] FIG. 4 is a diagram showing a recording/reproducing circuit in a conventional magnetic recording/reproducing device. In the figure, (1) is the recording medium, (
2) is one Herad slider, (3) is a head core disposed on the Herad slider (2), (4) is a recording/reproducing coil wound around the head core (3), (
5) shows the center tap of the recording/reproducing coil (4), (6) is one terminal of the recording/reproducing coil (4), and (7) is the other terminal of the recording/reproducing coil (4). It is. (8) is a magnetic energy absorbing resistor (hereinafter referred to as a "dump resistor") connected between the terminals (6) and (8) of the above-mentioned recording/reproducing coil (4), and (9) is the above-mentioned recording/reproducing coil (4). This is a recording/reproducing circuit to which the terminals (6) (8) of the coil (4) and the center tap (5) are connected. On the other hand, (10) is the other head slider, (11) is the head core disposed on the hent slider (10), (12) is the recording/reproducing coil wound around the herad core (11), ( 13) is the recording/reproducing coil (1)
2), (14) is one terminal of the recording/reproducing coil (12), and (15) is the other terminal of the recording/reproducing coil (12). (16)
is the terminal (14) of the recording/reproducing coil (12) mentioned above.
(15) is a dump resistor connected between the terminals (14) and (15) of the recording/reproducing coil (12) mentioned above.
and a center tap (13) are also respectively connected to the recording/reproducing circuit (9). (il) (i2) is
The recording current (i3) flowing through the recording/reproducing coil (4) is the induced current induced between the terminals (14) and (15) of the recording/reproducing coil (12) by the recording current (il) (i2). .

FIG. 5 is a waveform diagram showing the current waveform of each part illustrated in the above-mentioned No. 4 @. In FIG. 5, (11) is one terminal (6) of the recording/reproducing coil (4) as described above. ), the recording current (12) is the recording current flowing through the recording/reproducing coil (4).
), (el) is the induced voltage induced in the other recording/reproducing coil (12),
(i3) is the above-mentioned induced current flowing due to this induced voltage (el).

Next, a double-sided access FD with the configuration shown in Figure 4
The operation of the recording/reproducing section in D will be explained. When the recording current shown in FIG. 5 flows through one of the recording and reproducing coils (4), a recording magnetic field (not shown) is applied to the head core (3) around which the recording and reproducing coil (4) is wound. ) is generated, and a predetermined signal is recorded on the recording medium (1) by this recording magnetic field.

At the same time, the leakage portion of the recording magnetic field generated above interlinks with the other recording/reproducing coil (12), thereby generating an induced voltage (el) as shown in FIG. A limited induced current (i3) flows. When the induced current (i3) flows through this recording/reproducing coil (12), a magnetic field corresponding to the induced current (i3) is generated in the other Herad core (11) around which this recording/reproducing coil (12) is wound. This generated magnetic field may cause overwriting on the side of the recording medium (1) opposite to the side on which recording is to be performed, and in severe cases, data may be destroyed on the opposite recording side. There is.

[Problems to be Solved by the Invention] Conventional magnetic recording and reproducing apparatuses have been configured as described above, so that the recording and reproducing apparatus corresponding to the recording surface of the recording medium on which overwriting is performed in order to improve the overwriting modulation characteristics. If the write current is increased, data will be destroyed by overwriting on the recording surface opposite to the above recording surface, and in order to prevent such data destruction, it is necessary to suppress the increase in the write current flowing to the recording/reproducing coil. In this case, there was a problem that the single overwrite characteristics deteriorated.

This invention was made to solve the above-mentioned problems, and aims to provide a magnetic recording/reproducing device that does not cause data destruction and has good overwriting characteristics.

[Means for Solving the Problems] The magnetic recording and reproducing device according to the present invention has a magnetic recording and reproducing device that, when a recording current is supplied from a reproducing circuit to one of the recording and reproducing coils, causes the recording and reproducing coils to perform recording on the other recording and reproducing coil. This device is characterized by being provided with an induced voltage absorbing means for absorbing the induced voltage generated on the reproduction coil side.

[Function] The induced voltage absorbing means in this action absorbs the induced voltage generated on the side of the other recording/reproducing coil when a recording current is supplied from the recording/reproducing circuit to one of the recording/reproducing coils. It is.

[Example 1] An example of the present invention will be described below with reference to the drawings. In FIG. 1, (1) to (6) are the same as those shown in FIG. 4 described above, and their explanation will be omitted. (17) are connected in parallel with each other with opposite polarities, and are connected in series with the dump resistor (8) to one terminal (
6) and the other terminal (7) of the recording/reproducing coil (4).
This is an induced voltage absorbing means, that is, a diode pair, connected between the Similarly to the above, (18) is a dump resistor (
16) is an induced voltage absorbing means, that is, a diode pair, connected in series.

In FIG. 2, (11) to (i3) (el) are the same as in FIG. Further, FIG. 3(a) shows the characteristics of the diode, and FIG. 3(b) shows the characteristics of the diode pair.

Next, the operation of the apparatus having the configuration shown in FIG. 1 will be explained. In FIG. 1, when the recording current (11) (12) shown in FIG. 2 flows through one of the recording/reproducing coils (4), the head core (3) around which the recording/reproducing coil (4) is ) A recording magnetic field (not shown) is generated, and a predetermined signal is recorded on the recording medium (1) by this recording magnetic field. The leakage portion of the recording magnetic field generated at the same time interlinks with the other recording/reproducing coil (12), thereby generating an induced voltage (el) as shown in FIG.

By the way, the dump resistor (16) has a diode pair (1
8) are connected in series, and the above diode pair (
The characteristics of the diode forming 18) are shown in Figure 3(a).
As shown in the figure, the above diode pair (1
The characteristics of 8) are as shown in FIG. 3(b).

Therefore, the induced current flowing in the recording/reproducing coil (2) is limited by these diodes, as shown in FIG. 2 (i3). Therefore, the other Heradcore (11
) also becomes smaller, and this herad core (
Data on the recording surface of the magnetic medium (1) corresponding to 1) will not be destroyed. Therefore, the overwriting characteristics can be improved by increasing the recording current flowing through the recording/reproducing coil. Although the above embodiment has been described using one diode pair, a plurality of diode pairs may be used depending on the induced voltage, and the same effects as in the above embodiment can be obtained.

[Effects of the Invention] As described above, according to the present invention, when a recording current is supplied from the recording/reproducing circuit to one of the recording/reproducing coils, the induced voltage generated in the other recording/reproducing coil is reduced. Since the magnetic recording device is configured to absorb this, it is possible to obtain a magnetic recording/reproducing device that does not cause data destruction and has good overwriting characteristics.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a recording/reproducing section of a magnetic recording/reproducing device according to an embodiment of the present invention, FIG. 2 is a waveform diagram showing waveforms of each part of the device illustrated in FIG. 1, and FIG. 1 is a characteristic diagram of a diode used in the device shown in FIG. 1, FIG. 4 is a circuit diagram showing a recording/reproducing section of a conventional magnetic recording/reproducing device, and FIG. 5 is a diagram showing each part of the device shown in FIG. 4. FIG. In the figure, (1) is a magnetic recording medium, (3) is a helad core, (4) is a recording/reproducing coil, (8) is a dump resistor,
(9) is a recording/reproducing circuit, (11) is a head core, (12)
) is the recording/reproducing coil, (16) is the dump resistor, (17
) (18) is a diode pair (induced voltage absorbing means). Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (1)

[Claims] two magnetic heads that face each other via a magnetic recording medium capable of recording on both sides, each having a recording/reproducing coil, and respectively performing recording, reproducing, and erasing on the magnetic recording medium; In the magnetic recording and reproducing apparatus, the magnetic recording and reproducing circuit is equipped with a recording and reproducing circuit that supplies a recording current for recording on the magnetic recording medium to each of the recording and reproducing coils. 1. A magnetic recording and reproducing apparatus, comprising an induced voltage absorbing means for absorbing an induced voltage generated in the other recording and reproducing coil when a recording current is supplied to one of the recording and reproducing coils.