JPH02239411A - Magnetic head - Google Patents

Abstract

PURPOSE:To improve performance and mass productivity by forming back bars for recording, reproducing and erasing of L-shaped parts, joining the back bars to the central leg part of an E-shaped composite core member on the surfaces to face the leg parts at both ends and joining the back bars to the leg parts at both ends of the side faces orthogonal with the opposite surfaces. CONSTITUTION:The back bar 10 for recording and reproducing is spanned between the ends of the J-shaped leg 1 and the I-shaped leg 2 and the end face 10a of the L-shaped back bar 10 is joined to the surface of the I-shaped leg 2 to face the J-shaped leg 1. The side face 10b of the back bar 10 is joined to the side face orthogonal with the opposite surface of the J-shaped leg 1. The back bar 11 for erasing is made into the same constitution and is spanned between the ends of the J-shaped leg 4 and the I-shaped leg 5. The spacing equiv. to the width of the central leg part is, therefore, provided eventually between the two back bars 11 and 12. The generation of crosstalks between the head side for recording and reproducing and the head side for erasing and the possibility of the deterioration of the recording and reproducing characteristics are eliminated and the work for mounting the back bars is simplified. The high- performance magnetic head is efficiently and easily obtd. in this way.

Description

DETAILED DESCRIPTION OF THE INVENTION <<Industrial Application Field>> The present invention relates to improvement of a magnetic head used in, for example, a magnetic disk device.

<<Prior Art>> A typical structure of a magnetic head for a magnetic disk device is shown in FIG. In this structure, a U-shaped recording/reproducing core 3 is formed by combining a J-shaped leg 1 and an L-shaped leg 2, and a U-shaped recording/reproducing core 3 is formed by combining a J-shaped leg 4 and an I-shaped leg 5 in the same way. The I-shaped leg 2 of the recording/reproducing core 3 and the I-shaped leg 5 of the erasing fan 6 are joined to form an E-shaped composite core member 13 as a whole.

A recording/reproducing gap G2 is formed on the combined surface of the J-shaped leg 1 and the I-shaped leg 2, and a recording/reproducing coil 7 is wound around the J-shaped leg 1. Similarly, an erasing gap G2 is easily formed by combining the J-shaped leg 4 and the I-shaped leg 5, and the erasing coil 9 is formed in the J-shaped leg 4.
is wound. In addition, a thin spacer (not shown) made of a non-magnetic material such as ceramic or glass is interposed between the joint surface of the I-shaped leg 2 of the recording/reproducing core 3 and the I-shaped leg 5 of the erasing core 6, so that the two are magnetically connected. are separated.

When viewed from the surface side of the gaps Gl and G2 in contact with the recording medium, a recording/reproducing back bar 10 as a yoke is bridged and joined to the rear end portions of the J-shaped leg 1 and the I-shaped leg 2; With shape foot 4! Back bar 1 for erasing on the rear end of the leg 5
1 are bridged and connected. A closed magnetic circuit for recording and reproduction is formed by the back bar 10.
1 forms a closed magnetic circuit for erasing.

The assembly process of this elliptical magnetic head will be briefly explained. First, assemble the E-shaped composite core member 13,
This is combined with a slider (not shown) to form an integral part. Next, the coils 7 and 9 are attached to the J-shaped legs 1 and 4 of this integral part.

Thereafter, back bars 10 and 11 are bonded to the rear end of each leg using magnetic adhesive. The back bars 10 and 11 may be separately bonded to the composite member 13, but generally, in order to simplify the assembly process, the back bars 10 and 11 are bonded to a hard adhesive layer of non-magnetic material such as glass. They are joined in advance to form one continuous prismatic column via a magnetically separated spacer, and this is joined to the composite core member 13 in one step.

<<Problems to be Solved by the Invention>> In the magnetic head of the conventional structure described above, when joining the connected back bars 10 and 11 to the composite core member 13, the bonding surface of the back bars 10 and 11 (the It is necessary to precisely match the joint surface of the 1-shaped leg 2 and the I-shaped leg 5 (the above-mentioned smoothing part), which makes the assembly process very complicated and causes a decrease in yield. It had become. If the joint surfaces of the I-shaped legs 2 and 5 and the joint surfaces of the back bars 10 and 11 do not exactly match, crosstalk may occur due to leakage of magnetic flux between the recording/reproducing head section and the erasing head section. As the talk increases, the recording/reproducing characteristics deteriorate and the symmetry of the recording/reproducing signal deteriorates.

The crosstalk will be explained in detail. When the erasing fill 9 is excited, the J-shaped leg 4 - the erasing back bar 11 → the I-shaped leg 5
→Magnetic flux flows through the closed circuit of erasing gap G2-J-shaped leg 4. However, if the end of the erasing back bar 11 overlaps the recording/reproducing I-shaped leg 2, the J-shaped leg 4→erasing back bar 11→■-shaped leg 2→recording/reproducing back bar 1
0-J type leg 1 - recording/reproducing gap Gl-1 type leg 2-1
A relatively large leakage magnetic flux also flows through the closed circuit from the shaped leg 5 to the elimination gap G2 to the J shaped leg 4.

Note that a similar crosstalk phenomenon occurs even if the positional deviation of the bonding surfaces is reversed.

This invention has been made in view of the above-mentioned conventional problems, and its purpose is to facilitate the joining of the back bar to the E-shaped composite core member, and to improve the crosstalk and recording/reproducing characteristics. It is an object of the present invention to provide a magnetic head which is high in performance and can be mass-produced without causing deterioration of the magnetic head.

<Means for Solving the Problems> Accordingly, in the present invention, the recording/reproducing back bar and the erasing back bar are each independent approximately L-shaped parts, and are attached to the central leg of the E-shaped composite core member. This has a structure in which a back bar is joined to the surfaces facing the leg portions at both ends, and the back bar is joined to the side surfaces perpendicular to the facing surfaces for the leg portions at both ends.

<<Function>> The record reproducing back bar and the erasing back bar are joined to the E-shaped composite core member so as to sandwich the central leg part thereof, and are separated by the width of the central leg part. . Therefore, crosstalk through the back bar does not occur, and the magnetic circuit on the recording/reproducing side and the magnetic circuit for erasing are well separated. It shows the configuration of the head. The composite core member 13 is the same as the conventional one shown in FIG.
A U-shaped erasing core 6 is constructed by combining the L-shaped legs 2 and the I-shaped legs 5, and the L-shaped legs 2 and 1-shaped legs 5 are joined via a substrate such as glass to form an E-shaped core as a whole. It consists of two parts. Further, the recording and reproducing coil 7, the erasing coil 9, the recording and reproducing gap Gl, and the erasing gap G2 are also the same as in FIG.

The embodiment shown in FIG. 1 differs from the conventional example shown in FIG. 2 in the form of the recording/reproducing back bar 10 and the erasing back bar 11 and the structure in which they are joined to the composite core member 13.

As clearly shown in the figure, each of the back bars 10 and 11 is formed in the shape of a rectangular column bent at a right angle into an L shape, and unlike in the past, the back bars 10 and 11 are not joined to each other. not present.

The recording/reproducing back bar 10 is a yoke spanning between the ends of the J-shaped leg 1 and the I-shaped leg 2. The J-shaped leg 1 and the I-shaped leg 2 are prismatic, and the end face 10a of the L-shaped back bar 10 is joined to the surface of the J-shaped leg 2 facing the J-shaped leg 1.
A side surface 10b of the back bar 10 is joined to a side surface of the shaped leg 1 that is perpendicular to the opposing surface.

The erasing back bar 11 has the same configuration, J-shaped leg 4 and ■-shaped leg 5.
spanned between the ends of the The edge 11a of the back bar 1 is joined to the I-shaped leg 5 facing the J-shaped leg 4, and the side surface 1lb of the back bar 11 is joined to the side surface of the J-shaped leg 4 that is perpendicular to the opposing surface. There is.

Therefore, the end surface 10a of the back bar 10 and the back bar 1
1, and the back bars 10 and 11 are spaced apart by the width of the I-shaped legs 2 and 5.

<<Effects of the Invention>> As described in detail above, in the magnetic head according to the present invention, the recording/reproducing back bar and the erasing back bar are arranged so as to sandwich the end of the central leg of the E-shaped composite core member from both sides. are joined, and there is a gap equal to the width of the center leg between both back bars, so crosstalk between the recording/playback head side and the erasing head side is prevented via the back bar, as in the conventional case. This eliminates the possibility of occurrence of phenomena or deterioration of recording/reproducing characteristics. Furthermore, since there are no problems associated with the accuracy of the mounting position of the back bar as in the prior art, the work of mounting the back bar to the E-shaped composite core member becomes extremely simple. In other words, high-performance magnetic heads can be mass-produced efficiently and easily.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a schematic structure of a magnetic head according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a schematic structure of a conventional magnetic head. tab Section I 1...J-shaped leg 2...
・・・I-shaped leg 3・・・・・・Recording/playback core 4
......J-shaped leg 5...I-shaped leg 6...Erasing core 7...
... Recording and reproducing coil 9 ... Erasing coil 10 ... Recording and reproducing back bar 11 ...
- Erasing bag bar 13... Composite core member G1... Recording/reproduction gap G2... Erasing gap

Claims (1)

[Claims] A composite core member in which one b of the two prismatic legs a and b of the recording/reproducing core and one c of the two prismatic legs c and d of the erasing core are joined to form an E-shape as a whole. , a back bar e serving as a yoke spanning between the ends of the two legs a and b, and a back bar serving as a yoke spanning between the ends of the two legs c and d. In the magnetic head having a bar f, the back bar e is formed in a substantially L-shape, and is joined to a surface of the leg b facing the leg a, and the back bar e is joined to the surface of the leg b facing the leg a. The back bar f has a substantially L-shape, is joined to a surface of the leg c facing the leg d, and is perpendicular to the facing surface of the leg d. A magnetic head characterized by being joined to the side surface of the magnetic head.