JPH03104008A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve the characteristic by joining the rear end parts of cores of a read coil and a write coil, and providing a magnetic resistor to the head part. CONSTITUTION:When a prescribed current flows through a read coil 3 in order to read the stored information of a storing medium by a magnetic head 11, a leaked magnetic field for reading near a gap 15 is leaked from a first core 12 and flows through a magnetic resistor 14 to a second core 13. When a prescribed current flows to a write coil 15 in order to record storing information in the storing medium, one part of the leaked magnetic field near the gap 15 is leaked from the resistor 14 and the other part is leaked directly from the core 12. Thus, since the leaked magnetic field near the gap 15 is made larger at the time of writing rather than at the time of reading, the both reading and writing characteristics are improved.

Description

[Detailed Description of the Invention] [Summary] The present invention relates to the structure of a magnetic head that writes desired information to a storage medium such as a magnetic tape or a magnetic card, and reads information recorded on a storage medium, with improvements in writing and reading characteristics. A second core, around which a writing coil is wound, is connected to a rear end of a first core around which a reading coil is wound, and the rear end of a second core, around which a writing coil is wound, is connected to the rear end of the first core, and is opposed to the tip of the first core. A magnetoresistive element made of a flux density member with a flux density t% higher than that of the second core is provided at the tip of the second core, and the write magnetic flux generated when a predetermined current is passed through the write coil is saturated. A read/write gap is formed between the magnetoresistive body formed in this manner and the tip of the first core.

[Industrial application field]

The present invention relates to a magnetic head for writing desired information to a storage medium such as a magnetic tape or a magnetic card, and for reading information recorded on the storage medium, and particularly to a single-gap magnetic head that performs writing and reading in one gap. relating to something.

[Conventional technology]

FIG. 3 shows the main structure of a conventional single-gap magnetic head. The magnetic head 1 has a first core 2 around which a read coil 3 is wound, and a second core around which a write micro-coil 5 is wound.
It is equipped with core 4 of. The rear end (lower end) of the second core 4 is joined to the rear end (lower end) of the first core 2 .

The tip of the first core 2 and the tip of the second core 4 have an appropriate length δ. Opposed read/write gap 6
is formed.

Such a magnetic head 1 reads recorded information on a storage medium (not shown) by a leakage magnetic field near the gap 6 when a predetermined current is passed through the coil 3, and when a predetermined current is passed through the coil 5, information recorded in a storage medium (not shown) is read by a leakage magnetic field near the gap 6. Desired information can be recorded on a storage medium (not shown) by the leakage magnetic field.

In general, it is desirable that the gap length (δ), which is determined by the recording wavelength, the structure of the storage medium, etc., be larger during writing, which is performed while erasing already recorded signals, than when reading the recording of the storage medium. .

Therefore, in the single-gap magnetic head 1, the gap length δ. is set to an intermediate value between the optimum value from the write characteristics and the optimum value from the read characteristics.

[Problem to be solved by the invention]

As explained above, the conventional magnetic head 1 has a gap length δ at an intermediate value between the write characteristics and the read characteristics. There was a problem in that both the writing characteristics and the reading characteristics were sacrificed to some extent in order to set .

[Means to solve the problem]

According to FIG. 1, which shows an embodiment of the magnetic head of the present invention, which aims to improve write characteristics and read characteristics, the rear end portion of the l-th core 12 around which the read coil 3 is wound (
The rear end (lower end) of the second core 13 around which the writing coil 5 is wound is joined to the lower end of the second core 13, which is opposite to the end of the first core 12. is provided with a magnetic resistor 14 made of a material with a lower magnetic flux density than the second core 13, and is formed such that the write magnetic flux generated when a predetermined current is passed through the write coil 5 is saturated. It is characterized in that a read/write gap l5 is formed between the first core 12 and the tip end thereof.

[Effect]

According to the above means, the leakage magnetic field during reading when a predetermined current is passed through the write coil leaks from the first core and enters the magnetoresistive element, so that the effective read gap length is the length between the magnetoresistive element and the l-th core. This corresponds to the gap facing the tip. On the other hand, a part of the leakage magnetic field during writing when a predetermined current is passed through the write coil leaks from the magnetoresistive element and enters the first core, and the other part leaks from the second core and enters the first core. Because it enters the core, the apparent gap length for writing is larger than the opposing gap between the magnetoresistive element and the tip of the first core.

As a result, the leakage magnetic field near the gap becomes larger during writing than during reading, and both the reading and writing characteristics of the magnetic head are improved.

〔Example〕

Embodiments of the magnetic head according to the present invention will be described below with reference to the drawings.

FIG. 1 is a main structural diagram of a magnetic head according to an embodiment of the present invention, and FIG. 2 is an explanatory diagram of a leakage magnetic field of the magnetic head shown in FIG. 1.

In FIG. 1, a single-gap magnetic head 11 that performs reading/writing using one gap has a writing coil 5 wound around the lower end of a first U-shaped core l2 around which a reading coil 3 is wound. Second U-shaped core 13
The lower ends of are joined.

The first core 12 and the second core 13 are made of Si, Aj2,
A core 13 is made of a ferromagnetic material such as Sendust, which is a ternary alloy of Fe, and faces the tip (upper end) of the core 12.
A magnetoresistive element l4 made of permalloy, ferrite, or the like, which is a material with a lower magnetic flux density than the core 13, is provided on the inner end surface of the tip (upper end) of the core 12, and the resistance part 14 is connected to the tip of the core 12.
A gap 15 is formed between the two.

Such a magnetic resistor 14 has a core 13 having a magnetic permeability of 3, for example.
When using sendust of about 0000, the magnetic permeability is 8
Vermalloy of approximately 0.000% is deposited on the tip of the core 13 by means such as vapor deposition.

The length δ1 of the gap 15 is set to, for example, 20 μm in accordance with the reading characteristics of the magnetic head 11, and the length δ1 of the coil 5 is set to 20 μm, for example.
The thickness t of the magnetoresistive element 14 at which the write magnetic flux reaches a saturated state when a predetermined current is applied to the magnetoresistive element 14 is, for example, about 20 μm.

In such a magnetic head l1, when a predetermined current is passed through the reading coil 3 in order to read storage information of a storage medium (not shown) by a leakage magnetic field near the gap l5, the leakage magnetic field for reading near the gap 15 is as shown in FIG. stomach)
As shown by the arrow in FIG.

When a predetermined current is passed through the write coil 5 in order to record storage information on a storage medium (not shown) by the leakage magnetic field near the gap 15, the write leakage magnetic field near the gap 15 is as shown in FIG. 2 (0). As shown by the arrow, a part leaks from the magnetic resistor 14, and the other part leaks from the first magnetic resistor 14.
leaks directly from the core 12.

[Effects of the Invention] As described above, according to the present invention, the leakage magnetic field near the gap becomes larger during writing than during reading, and has the effect that both the reading characteristics and writing characteristics of the magnetic head are improved.

[Brief explanation of drawings]

Fig. 1 is a diagram showing the main structure of a magnetic head according to an embodiment of the present invention, Fig. 2 is an explanatory diagram of the leakage magnetic field of the magnetic head shown in Fig. 1, and Fig. 3 is a main composition diagram of a conventional single-gap magnetic head. The composition is . In the figure, 3 is a read coil, 5 is a write coil, 1l is a magnetic head, 12 is a first core, 13 is a second core, 14 is a magnetoresistive element, I5 is a gap, and t is the thickness of the magnetoresistive element. and δ1 is the length of the gap. Good 1 mouth (A) (Rono 1st Old 12th Show V Manpu fake...D's 2 leaks; Death Ship i3 World's Kozuki 5th Tsuki Atsushi) $ 2 Mouth

Claims (1)

[Claims] Wound first core (12) of reading coil (3)
The rear end of the second core (13) around which the writing coil (5) is wound is joined to the rear end of the first core (12).
) is provided at the tip of the second core (13) opposite to the tip of the write coil. (5
) is provided with a read/write gap (15 ) is formed.