JPS6292207A - Magnetic head and its manufacture - Google Patents

Abstract

PURPOSE:To reduce remarkably the magnetic path length by providing a winding groove within the track width working region in providing a winding to a magnetic head and exposing a part of the winding to the track width working groove so as to approach the winding to the head gap. CONSTITUTION:Magnetic cores 1, 2 whose tip is projected are overlapped, a winding 6 is provided between them to form a magnetic head while being clipped by a nonmagnetic base 8. In forming the head, a comb-shaped magnetic core 2' is bonded at first to a nonmagnetic base 8' and a winding groove 4 is engraved at the inner side of a joint 2'' of a core 2'. Then track width working grooves 10-10'' are formed to the front side face of the bonding block, the face opposing to the gap is ground to eliminate the distortion generated at the track width working by heat treatment. Then the winding 6 is wound at the peripheral of the rear projection 5 of the core 2', the side is covered by the other nonmagnetic base 8, the base 8 and the core 2' are cut off along the center line of the grooves 10-10'' to form individual heads.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to the structure and manufacturing method of a magnetic head for a video head for VT technology, a video head for an electronic camera, and the like.

(B) Prior Art The present invention relates to a magnetic head in which a pair of core halves forming a head are joined to a non-magnetic substrate at their respective outer sides, and a pair of core halves forming a head are connected to a non-magnetic substrate. The present invention relates to the structure and manufacturing method of heads arranged side by side in the relative transfer direction to form heads. An example of this type of head is disclosed in Japanese Patent Laid-Open No. 60-147912 (in-line head for electronic still cameras (advanced structure and manufacturing method).

FIG. 5 shows a conventional example of a video recorder that is similar to, but different from, this. In FIG. 3, fi+ +
21 is a core half made of a highly permeable material such as sendust or ferrite, which is joined to the non-magnetic substrate (7) and (8) such as ceramic glass on the outside, and the core halves are connected to each other at the gap surface. (3) and/<TsukuCore are joined at the joint surface (5) to form the head of a closed magnetic circuit. In addition, the winding coil (6) has a core half (2
) and the protrusion (9) provided in the back core portion of the core piece 2. The squeeze part (If) made parallel to the relative transition direction of
(2) and is generally formed much smaller than the width WBC of the back portion of the head magnetic core.

FIG. 4 (al and (bl) are an internal view and a side view of the video head seen from above. The shaded area indicates a non-magnetic plate part.

FIG. 5 shows a conventional method of manufacturing the video head. (2) in Fig. 5(a) shows the front part (
2) It has a connected comb-like shape. This magnetic plate is bonded to the non-magnetic substrate (8) (Fig. 5(b)). As shown in Fig. 5(C), a groove (4) is provided, a convex region (9) is formed at the rear of the magnetic plate, and the winding is formed around this convex region (via this groove (4)). (6) is formed. Next, Fig. 5(b) is formed.
1 and similar parts are joined in a predetermined position as shown in FIG. 5(d). Although not shown in the figure, a gap spacer is installed at the front of the pair of magnetic plates to form a gap (3).
This is done by one person or by vapor deposition, etc. Next, as shown in Figure 5 (tel 10) (101), grooves are formed so as to leave a width W~C in the front part of the joined body. The front connecting portion (2) connecting the rear rectangular protrusions of the comb-shaped magnetic body (2) shown in Figure 5 (a) (bl) is cut and the magnetic body is separated. The broken line part (
By cutting and separating this joined body along line 11), the head is completed as shown in FIG.

T,! → Problems to be solved by the invention In the conventional structure, the track width was processed after the winding was formed, so in order to prevent the winding coil from breaking due to the track width processing, the groove width L for the winding coil was changed (Fig. 3). 4) in Figure (b) had to be increased.

Therefore, the magnetic path length of the core becomes long, resulting in a decrease in output such as reproduction sensitivity of the head.

In the conventional manufacturing method, track grooves and the like are processed after the core halves are joined. Therefore, it is difficult to remove machining distortion during track groove machining, resulting in a decrease in the sensitivity of the head.

B) Means for solving the problem A structure in which the winding groove is accommodated within the area for processing the head track width, and the winding portion is further exposed in the groove for processing the track width.

Track width processing is performed in a process before forming the winding portion.

After the track width machining is completed, the core is heat treated to remove machining distortion.

(e) Function: The width of the groove for the winding coil can be formed small, so the magnetic path length of the core is shortened, and the winding is brought closer to the gear, improving head efficiency.

Processing distortion is removed, the magnetic properties of the core are improved, and the efficiency of the head is improved.

(F) Embodiment FIG. 1 shows the structure of the present invention, and FIGS. 2(a) and 2(b) show a configuration diagram and a side view thereof as seen from above.

In the present invention, the width of the winding groove (4) is so small that the winding wire (6) can be inserted into the groove with almost no margin in its cross section. As a result, the groove part is located in the machined groove (10) (10) area of the cross section or the track width of the core, and further (
This winding (6) has the track width machined grooves (10) (10)
It has a structure that protrudes into the area.

FIG. 6 shows a part of a manufacturing example of the head of the above embodiment. In head manufacturing according to the present invention, ffJ5 (b)
), the winding groove 4 is formed inside the connecting part (2) of the comb-shaped magnetic core using the same method as before (conventionally, the rear end surface of the groove is formed inside the connecting part (2) of the comb-shaped magnetic core). ) was located further back than ). Then form it into a surface. In this case, if (1) and (7)) of the other comb-shaped magnetic core and non-magnetic substrate that form the head (Fig. The occurrence of misalignment can be completely prevented. After completing this track width machining, the gap surface is polished and heat treated to remove the machining distortion of the magnetic core that occurred during the track width machining. If the magnetic core material is, for example, sendust material, the removal of this processing strain is almost completed by raising the temperature to about 700° C. or higher in a vacuum or in a 5" hydrogen atmosphere. After the heat treatment is completed, a gap spacer film is formed. Next, wind the wire around the protrusion (5) provided at the rear of the magnetic core (2), align the track positions of the two wires, and bond with an organic adhesive such as epoxy resin or glass.Finally. Make the first cut at the predetermined position.
Complete the head as shown. In this embodiment, a part of the winding is exposed in the track width processing groove, but since it is located at least below the contact surface with the head medium, a protective layer can be easily formed with resin, glass, etc., which is particularly useful in practical use. No problems arise. Figure 6 ((l) shows a part of the manufacturing process of another embodiment of the present invention. In this case, the track width machining is shown in Figure 6 (
Based on the shape of a), only the magnetic core or the vicinity of the gap of the magnetic core is processed by ultrasonic machining, electric discharge machining, or photolithography. Next, by forming a head in the same manner as in the above-described embodiment, a head having a shape as shown in FIG. 7 will be formed. In the structure of this example, the coil winding (
6) is exposed from the track width processed portion of the magnetic core, but is sandwiched on both sides by two non-magnetic substrates, making the head highly reliable in practice. ′! In Figure 66 (d), the track width is processed only at a depth from the sliding surface of the head medium (equivalent to the head and gap depth length), step 14, and the core is separated using the same method as in Figure 6 (C). In this example, the head has the structure shown in FIG. It is easy to obtain, and the winding is protected by a non-magnetic substrate, so it has high practical reliability.

(g) Effects of the invention The head winding section can be brought closer to the head gap, the magnetic path length of the herad core can be made much shorter, and distortion during track width processing can be removed, improving the core efficiency of the head. , recording and reproducing efficiency can be greatly improved.

[Brief explanation of drawings]

FIG. 1 is an external view of the magnetic head of the present invention, FIG. vI62 is an explanatory view thereof, and FIG. 3 is an external view of a conventional magnetic head.
FIG. 4 is an explanatory diagram thereof. FIG. 5 is a diagram showing a conventional manufacturing method, and FIG. 6 is a diagram showing a part of the head manufacturing method of the present invention. FIGS. 7 and 8 are diagrams showing other embodiments of the present invention. (1 bar 2)...Core half, (6)...Winding, (7H
81...Nonmagnetic substrate, (9)...Protrusion, +101(
1■...Groove.

Claims (2)

[Claims] (1) A pair of core halves forming a head are each joined to a non-magnetic substrate on one outer surface, and a winding is placed on a convex portion provided at the rear of one of the core halves. In a magnetic head having a structure in which a pair of core halves and a nonmagnetic substrate are arranged side by side in the direction of relative movement with the recording medium, the track width of the magnetic head is determined by each core half or the nonmagnetic substrate. a groove formed from the front surface of the magnetic head parallel to a direction of relative movement of the bonded body with the recording medium, and configured such that a convex portion provided on the one core half is included in this groove. magnetic head. (2) A pair of core halves forming the head are each joined to a non-magnetic substrate on one outer surface, and a winding is arranged on a convex portion provided at the rear of one of the core halves, and A magnetic head having a structure in which a pair of core halves and a nonmagnetic substrate are arranged side by side in the direction of relative movement with a recording medium, and the track width of the magnetic head is set by each core half or a nonmagnetic substrate. A groove is formed from the front surface of the magnetic head parallel to the direction of relative movement of the body plate and the bonded body to the recording medium, and a convex portion provided on the one core half is included in this groove. In a method of constructing a magnetic head configured as described above, a comb-shaped magnetic core is bonded to a non-magnetic substrate so that the connecting portion thereof is located at the front to form a bonding block, and the connecting portion is left in the connecting portion. A winding groove is formed, and then a track width processing groove is cut from the front of the joint block in a direction perpendicular to the winding groove, and then heat treatment is performed to remove processing distortion. A method of manufacturing a magnetic head, comprising the step of forming a gap spacer film.