JPS60185217A - Magnetic head and its production - Google Patents

Abstract

PURPOSE:To improve sliding characteristics with a recording medium by forming only a part close to a working gap like a peak as a magnetic recording medium sliding surface and constituting the surface shape of a surface opposed to a magnetic recording medium so as not to have parallel part with the working gap. CONSTITUTION:Notched grooves 12, 12' for determining track width are formed on positions close to the working gap 11 to form required track width, a reinforcing groove 18 to be charged with a reinforcing/joining material is formed on the joint part of the working gap and the notched grooves 12, 12' and the reinforcing groove 18 are charged with nonmagnetic materials 13, 13', 19 such as glass, ceramics and resin as respective reinforcing and joining materials. Only a part close to the working gap 11 and including the working gap at least is formed as magnetic recording medium sliding surfaces 15a, 15b and both the sides of the sliding surfaces 15a, 15b are formed as shoulder dropped surfaces 17a, 17b respectively. In addition, the border parts 16a, 16b between the recording medium opposed surfaces and the shoulder dropped surfaces are constituted so as not to have parallel parts with the working gap 11.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a magnetic head and a method for manufacturing the same, and provides a magnetic head suitable for recording and reproducing short wavelength signals in VTRs and the like.

(Prior art and its problems) In recent years, in magnetic recording, as the recording density has improved, the separation loss between the head and the magnetic recording medium has become severe, and the sliding contact characteristics between the magnetic head and the recording medium have improved the recording and reproducing characteristics of short wavelength signals. have a major impact on

To solve this problem, a pointed magnetic head with a recording medium sliding surface as small as possible was used.

A method of achieving good sliding contact characteristics with a recording medium is known. For example, as shown in FIG. 1, which is a perspective view of the magnetic head, the recording medium facing surface of the magnetic head 1 is cut off, leaving only the area near the operating gear knob 2, to form a pointed shoulder surface 3a, 3b. A magnetic head has been proposed. Furthermore, in order to narrow the track for the magnetic head for high-density recording, a notch 4 is provided near the 4-operating gap to regulate the track width.
established.

This is filled with a non-magnetic material for reinforcement. 5 is a window for coil winding.

FIG. 2 shows a plan view of the recording medium facing surface of the conventional magnetic head. Here, the recording medium sliding surface 5a,
Boundaries 7a and 71 between 51r and shoulder drop surfaces 3a and 3b:+
acts as a pseudo operating gap.

It has the disadvantage of impairing recording and reproducing characteristics. In particular, the boundary part 7a,
If 7b and the working gap 2 are parallel to each other, there is a drawback that the concours effect is severe.

(the purpose) The object of the present invention is to obviate such drawbacks of the prior art.

It is an object of the present invention to provide a magnetic head that has good sliding contact characteristics with a recording medium and exhibits excellent recording and reproducing characteristics, and to provide an easy manufacturing method thereof.

(Summary) It is formed into a pointed shape with only the area near the operating gap including the knob abutting part as the magnetic recording medium sliding surface, and the surface shape of the surface facing the magnetic recording medium is configured so that there is no parallel part to the operating gap. has been done.

Specifically, the method for manufacturing a magnetic head according to the present invention includes I.
) A pair of rectangular parallelepiped blocks made of magnetic material, +V forming a groove for coil winding on the gap forming side surface of at least one of the blocks, *1) Gap between the pair of blocks after completing step 1) 111) forming a reinforcing material filling groove parallel to the coil winding groove at the end opposite to the gap forming end of the forming side surface; Gap formation ti:ti on one side of the gap formation side K A process in which a notch groove for determining the track width is formed, and the width of the flat part sandwiched by the notch groove becomes i/rack width. xl, iV) After completing step 111), the gap forming side surfaces of the pair of blocks are mirror polished.

Step of forming a non-magnetic layer with a required thickness on at least one gap forming side surface + V) After the gap forming surfaces of the pair of blocks that have completed step iV) are butted against each other and bonded to each other, the pair of tracks is bonded to each other. Step 1: Filling the holes and grooves created by butting the width-determining notch groove and the reinforcing material filling groove with a non-magnetic material to fix and reinforce the blocks to create a joined block 1'l, V
The surface of the joint block facing the magnetic recording medium is cylindrically ground with a predetermined curvature in the direction perpendicular to the working gap, and the joint block has undergone the offset step (Vll) step vi) to obtain the required gap depth. The surface facing the magnetic recording medium is cut into a pointed shape, leaving at least the area near the actuating gear knob including the abutting part of the actuating gap, to form a magnetic recording medium sliding surface of a predetermined length and a shoulder drop surface of a predetermined inclination angle. Steps to form 1. ! i! , a step of cutting the bonded plate at a predetermined position to obtain at least one magnetic head core, and 1x) a step of cutting the bonded plate 07 after completing the VIID process step) to obtain at least one magnetic head core; The method includes the step of polishing the magnetic recording medium facing surface of the magnetic head core to a predetermined curvature in the core thickness direction so that there is no part parallel to the working gap at the boundary with the shoulder drop surface.

(Example) The shape of the magnetic hemet of the present invention and the manufacturing method thereof will be explained in detail below using two examples.

3+a) and tb) are a perspective view and a plan view showing the shape of a magnetic head in an embodiment of the present invention. 10 indicates the entire magnetic head. 12 and 12' are cutout grooves provided in the vicinity of the two working gaps 11 for determining the trunk width in order to form the required trunk width; A reinforcing groove 18 for filling is provided. In addition, the notch groove 12.1
2' and the reinforcing groove 18 are filled with non-magnetic materials 13, 13' and 19, such as glass, ceramic, resin, etc., as reinforcing bonding materials, respectively.

14 is a window for coil winding. Further, FIG. 3(1)) shows an enlarged view of the surface facing the magnetic recording medium. In the present invention, only the vicinity of the actuation gag, including at least the actuation gear knob 11, is used as the magnetic recording medium sliding surface 15a, 15b, and both sides thereof are made into eyebrow-cutting surfaces 17a, 17b, respectively.

Further, a boundary portion 16a between the recording medium facing surface and the dust removal surface.

161] is configured so that it does not have a bulge portion parallel to the working gap 11.

The magnetic head of the present invention can easily obtain good sliding contact characteristics because the recording medium sliding surface is made as small as possible. In addition, since the shape of the boundary between the recording medium sliding surface and the shoulder drop surface is formed so that there is no part parallel to the operating gap, there is no worry about deterioration of recording and reproducing characteristics due to contour effect, and the It is a narrow track magnetic head with excellent recording and reproducing characteristics even for wavelength signals.

Hereinafter, the method for manufacturing the magnetic head of the present invention will be explained in detail with reference to Examples.

Figures 4(a) to 4(a) are explanatory diagrams of each step of the manufacturing method of the present invention.
Shown in January.

1) Cut out a pair of rectangular parallelepiped blocks 20 and 21 made of magnetic material and having a size such that one side substantially corresponds to the side surface of the half of the magnetic head core as shown in FIG. 4(a). The material of the block is high permeability ferrite.

Sendust alloy or a laminate of amorphous magnetic alloy ribbons can be used.

11) As shown in FIG. 4(b), a groove 22 for forming a coil winding window is provided at least at the end of the block 20.21 near the operating gap on one of the operating gear knob forming surfaces.
2. Reinforcement filling groove 23.23 at the end of the actuation gap
' are provided parallel to the groove 22.

111) As shown in FIG. 4(c), blocks 20, 2
] is equal to the required track width, respectively.

By providing a plurality of cutout grooves 26.27 so as to leave flat portions 24.25 that serve as operating gaps, the block 30°3 that constitutes the core half of the narrow track magnetic head is formed.
Superior to 1. Next, mirror polishing of the gap abutment surfaces 28 and 29 is performed.

1v) As shown in FIG. 4(d), a pair of blocks 30
A non-magnetic material such as s HO2+ glass or ceramics is deposited by physical vapor deposition on at least one of the gap abutment surfaces of t!
form 32.

■) As shown in FIG. 4(E), the gap forming surfaces of the pair of blocks 30 and 31, each provided with a gear knob regulation layer 32, are precisely Match well. Due to this butt, the notch grooves 26 of the blocks 30 and 31
Track width regulating groove 3 formed by combining and 27
3. and grooves 23 and 2 in blocks 30 and 31
3/fJ''-Glass or ceramic as a reinforcing bonding material in the rear reinforcing groove 34 formed by combining.

A non-magnetic material 35, 36 such as resin is filled, and the pair of plugs 30 and 31 are mechanically joined and integrated to obtain a head block.

1.) As shown in Fig. 4(f), the tip end surface of the magnetic head block 37, which is formed by joining and integrating as described in step 1 or more, which will be the surface facing the recording medium, is aligned in the direction perpendicular to the 9-operating gap. Cylindrical grinding is performed until a predetermined curvature of 1 (, X is cut by 1) and the desired gyanoso depth is achieved.

For VTR magnetic heads, the 9 curvature Rx is 5 to 15;
It is preferable that the gap depth is 20 to 60 μm. Further, the recording medium facing surface of the magnetic head block 37 which has been subjected to one cylindrical grinding process is cut into a pointed shape leaving only the surfaces 38a and 38b in the vicinity of one working gap to form shoulder drops 39a and 39b. The inclination angle θ of the shoulder drop surface may be about 5 degrees.

In addition, each length of the surfaces 38a and 381) after cutting is 1. ．． 12 is preferably about 10 μr++.

11) As shown in FIG. 4 (G), the pointed magnetic head block 37 is cut across the center of the track width regulating groove 33 filled with reinforcing bonding material as shown by a chain a40. Then, a plurality of head cores having a predetermined thickness '1'w are formed. In some cases, it is cut at an angle of azimuth with respect to the working gap.

Vlii) As shown in FIG.
The recording medium facing surface is polished so as to have a predetermined curvature 1ty in the track width direction (core thickness direction), and the boundary portion 4- between the recording medium sliding surfaces 43a and 431] and the shoulder drop surfaces 39a and 39b is polished. The shapes of 4a and 44-b are designed so that they do not have any part parallel to the operating gear knob 45.
To run away.

The curvature tty may be about 1 to 3.

In this way, the magnetic head according to the present invention shown in FIGS. 3(a) and 3(1)) can be used.

(Effects) As described above, since the magnetic head of the present invention has a magnetic recording medium sliding surface as small as possible compared to conventional magnetic heads, it can easily achieve good sliding contact characteristics with the recording medium. Furthermore, since the shape of the surface facing the recording medium has no part parallel to the working gap, there is no concern about deterioration of recording and reproducing characteristics due to contour effects. Therefore, excellent head performance is achieved especially in recording and reproducing short wavelength signals. Also.

It is easy to manufacture and has high suitability for mass production.

[Brief explanation of the drawing]

1 and 2 are a perspective view and a plan view of a conventional magnetic head, and FIGS. 3(a) and (1)) are a perspective view and an enlarged view of the surface facing a magnetic recording medium of a magnetic head according to the present invention. FIG. 4A is a process explanatory diagram of the manufacturing method of (force to magnetism according to the present invention). 10: Magnetic head, 11, 45: Working gap, 12
．． 12', 33 Nidrak width regulation groove, 13.13
: 19, 35. 36 : Non-magnetic material for reinforcing bonding, 14:
Ko (Rumaki Himado, 1.5a, ], 5b, 43a
, 43b: Recording medium sliding surface, 16a, 16b,
4-4a, 44. b: Boundary part. ], 7a, 17b, 39a, 391): No fallen surface,
18.34: Rear reinforcement + j'J゛+20.2]: A pair of blocks made of magnetic material, 22: Groove for forming coil winding, 23.23': Groove for filling reinforcing material. 24.25: Flat part that becomes the working gap part, 26,2
7: Track width regulating groove Notched groove, 28.29: Gear knob butt surface, 30,3], : Pair of blocks forming core half, 32: Ganop regulation layer, 37:
Magnetic head block, 38a, 38b: Surface near gap, 4o: Magnetic head core cutting section, 41: Cutting heel 42: Henod base. Figure 1 Figure 2 Figure 4 Figure 4

Claims (2)

[Claims] (1) The cross-sectional shape of the magnetic recording medium facing surface is formed into a pointed shape with only the area near the working gap including at least the working gap abutting portion facing the magnetic recording medium, and the surface shape of the magnetic recording medium facing surface is A magnetic head characterized in that it is configured so as to have no working gap and no parallel portion. (2) a step of forming a groove for coil winding on the gap forming side surface of at least one of a pair of rectangular parallelepiped blocks 07 made of iYa material; 11) a gap between the pair of blocks after completing step 1); 111) forming a reinforcing material filling groove parallel to the coil winding groove at the end opposite to the gap forming end of the forming side surface; A step of forming a notch groove for determining the trunk width at the gap forming end of one gap forming side surface, and making the width of the flat part sandwiched by the notch groove equal to the trunk width, 1 ■) Engineering 1'4 fil
) After mirror-polishing the gap-forming side surfaces of the pair of blocks that have been completed, forming a non-magnetic layer of a required thickness on at least one gap-forming side surface; After the gear knob forming surfaces of the pair of blocks are butted against each other and joined together, the holes and grooves formed by the butt of the pair of trunk width determining notch grooves and reinforcing material filling grooves are filled with a non-magnetic material. The blocks are fixed and reinforced. Step of making a joint block: (1) cylindrical grinding of the surface of the joint block facing the magnetic recording medium at a predetermined curvature in a direction perpendicular to the working gear to obtain the required gear knob depth; VN) step; (2) After completing step 1, the magnetic recording medium facing surface of the bonded block is cut into a pointed shape, leaving only the area near the working gap including at least the working gap abutting part, and a predetermined length of the magnetic recording medium sliding surface and a step of forming a shoulder dropping surface with a predetermined inclination angle; ×) There should be no portion parallel to the operating gap at the boundary between the magnetic recording medium sliding surface of the magnetic head core and the debris removal surface. A method of manufacturing a magnetic head, comprising the step of polishing a surface of the magnetic head core facing a magnetic recording medium to a predetermined curvature in the core thickness direction.