JPH05298609A - Magnetic head - Google Patents

Abstract

PURPOSE:To enable highly precise positioning and prevent magnetic striction due to strain by providing the core main body of the magnetic head with a projection part for handling. CONSTITUTION:A core 1 which has the projection part 2b on a half piece 2 is fitted to a substrate 7. Namely, a couple of flanks 2c and 2c of the extension part 2b of the half piece 2b are clamped with a couple of clampers 8 and 8 and conveyed to specific positions on the substrate 7, the position of the core 1 is monitored through a video camera and adjusted, and an adhesive is supplied from a nozzle 10 to stick the core 1. The clampers 8 and 8 clamp the flanks 2c and 2c perpendicular to main surfaces 1c and 2c of the extension part 2b, so the core 1 is conveyed to the specific positions horizontally and stably. The extension part 2b is provided at a distance from a window 5 for winding, so even if pressure is applied by the clampers 8 and 8, no magnetic striction is caused at the periphery of the window 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head.

[0002]

2. Description of the Related Art Two magnetic heads (hereinafter referred to simply as "heads") for VTRs (video tape recorders) are used due to the recent increase in recording density and trick play modes such as slow mode and steel mode. Double azimuth heads, in which azimuth heads are installed side by side at a minute interval, are becoming popular. In this type of VTR,
As shown in FIG. 2, the two azimuth heads 71, 71 are aligned and attached to the substrate 7.

In order to convey the head 71 to a predetermined position on the substrate 7 for this attachment, it is done as shown in FIGS. FIG. 11 shows a state in which the head 71 is supported by the vacuum pad 70 by decompression and adsorption. FIG. 12 shows a state in which the head 71 is sandwiched and supported by the pair of movable arms 82, 82 of the handling machine 81.

[0004]

However, in the method of FIG. 11, the head is provided with the window 75 for the winding,
Since the vacuum pad 70 has a small adsorption area, it is difficult to support by adsorption. In the method of FIG. 12, the azimuth head is not a rectangular parallelepiped and the angle of the ridge is not 90 degrees, so it is difficult to reliably hold it. Therefore, the head 71 may be dropped by any of the methods shown in FIGS. 11 and 12, and it is difficult to control minute positions and postures. In particular, in the method of FIG. 12, there is a problem that stress is generated in the core of the head due to the gripping force at the time of clamping, and magnetostriction occurs depending on the material of the core, and further, the gap d between the gaps 74 and 74 shown in FIG. Head 71 with high-performance head) and one arm 82 attached first
However, there is a problem in that the next attachment becomes impossible due to the contact with the.

The present invention has been made in view of the above circumstances, and it is easy to handle regardless of the shape of the head main body, the head position can be accurately controlled with respect to the substrate, and the head main body can be controlled. It is an object of the present invention to provide a magnetic head that does not cause undesired changes in properties such as magnetostriction.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a magnetic head having a core body provided with a protrusion for handling.

[0007]

EXAMPLES Examples of the present invention will be described below.

FIG. 1 is a front view of the azimuth head, and FIG. 2 is a plan view of the same.

In the core 1, one half piece 3 and the other half piece 2 provided with a recess for forming the winding window 5 are joined to each other.
It is joined at a. Both halves 2 and 3 are formed by sintering ferrite powder. A region above the window 5 of the joint surface 1a is the head gap 4, and the head gap 4 is inclined by an angle θ with respect to the vertical direction of the main surfaces 1c, 1c of the core. The angle θ is called the azimuth angle. In this example, the azimuth angle θ is 10 degrees.

Grooves 1b and 1b each having a substantially semicircular shape are provided in regions of the main surfaces 1c and 1c on both sides of the joining surface 1a.
Is filled with glass 6, 6. The glass 6, 6 penetrates the fusion-bonded character into the joint surface 1a, whereby the two halves 2, 3 are joined. The glass 6 also penetrates into the head gap 4. In the core 1, the vertical side surfaces 2a and 3a of FIG. 1 are parallel to the joint surface 1a by the cutting process described later with reference to FIG. 5, and therefore intersect the main surfaces 1c and 1c at a non-perpendicular angle. ..

What should be noted in this example is that the protrusion 2b is extended from the half piece 2 to the right in the figure.

FIG. 3 is a plan view showing a state in which the head is attached to the substrate. The cores 1 and 1 are attached side by side on the substrate 7 with the head gap 4 side protruding. FIG. 4 is a front view seen from the side of the head gaps 4 and 4 in FIG. In these figures, 7a is a through hole for inserting a screw to be attached to the rotary drum. In FIGS. 3 and 4, the glass 6 in FIGS. 1 and 2 is omitted.

The cores 1 and 1 are attached to the substrate 7 as follows. The side surfaces 2c, 2c of the pair of extending portions 2b of the half piece 2 are clamped by a pair of clamping tools 8, 8 indicated by imaginary lines, and the substrate 2 is conveyed to a predetermined position on the substrate 7. Then, the position of the core 1 is inspected and adjusted with a video camera indicated by the phantom line, the adhesive is supplied from the nozzle 10 indicated by the phantom line, and the core 1 is attached to the substrate 7.
The same applies to the other core.

The clamps 8, 8 are the main surfaces 1c, 1 of the extension 2b.
Since it is sandwiched between the side surfaces 2c and 2c perpendicular to c, the core 1 is horizontally and stably sandwiched and safely transported to a predetermined position.
Further, the core 1 is attached to the substrate 7 at an accurate position by inspection with the video camera 9. The accuracy of this position is in μm. Further, the gap between the cores 1 and 1 can be minimized. Further, since the extended portion 2b is provided at a position apart from the winding window 5, even if pressure is applied by the holding tools 8 and 8, magnetostriction does not occur around the window 5 and it can be said that it is satisfactory. It is convenient. Even if the extended portion 2b is damaged, the function of the head is not affected.

Depending on the arrangement of the cores, the extending portion 2b
Alternatively, as shown by an imaginary line, the half piece 3 not provided with the recess for forming the window 5 may be provided with an extending portion 3b on the left side in the drawing, and may be sandwiched by the side surfaces 3c and 3c.

The azimuth angle θ is set as shown in FIG. In addition, the part corresponding to each part in FIG.
The sign with "0" added is attached.

The core body material 11 is formed into a long rod shape in the direction of the head gap 14, and has surfaces 20, 20 inclined by an azimuth angle θ with respect to the direction orthogonal to the head gap 14.
The core 1 of FIG. 1 is obtained by cutting to a predetermined thickness at 20 ... Next, the groove 1b shown in FIGS. 1 and 2 is cut in the main surface 1c, and the groove 1b is filled with the glass 6.

Next, a winding is wound around the window 5 of the core 1 to complete the head, and the head is mounted on the substrate 7 as shown in FIGS. However, the windings are omitted in FIGS. 3 and 4.

FIG. 6 is a sectional view of the rotary head drum mechanism in the video deck.

A rotary shaft 30 is rotatably attached to the fixed drum 24, and a rotary drum 22 having the same diameter as the fixed drum 24 is fixed to the rotary shaft 30 via a flange portion 23. In the gap between the rotary drum 22 and the fixed drum 24, the substrates 7 are screwed to the rotary drum 22 at, for example, four positions in the circumferential direction. The core 1 attached to the substrate 7 is located so that the head gap portion slightly projects outward from the rotary drum 22.

A magnetic core 31 is fixed to the flange portion 23 of the rotary drum 22 by an adhesive 32, 34 in the annular groove of the fixed drum 24 by adhesives 32 and 34, respectively, and is opposed to each other with a gap 29 therebetween. A rotary transformer mechanism is configured by the magnetic cores 31 and 33. In FIG. 6, 25 and 26 are annular recesses provided in the magnetic core, and 27 and 28 are coils. A rotary head drum mechanism is constituted by the above-mentioned parts.

FIG. 7 is a front view of a core according to another example.

In this example, the pair of halves 41A and 41B joined at the joining surface 41a are plates 42A, 42B and 43 made of a pair of non-magnetic materials (eg glass ceramics).
A, 43B and layers 45A, 45A, 45A and 45B, 45B made of a magnetic material (for example, sendust) sandwiched therebetween.
It consists of 45B. Insulating layers 46A, 46A, 46A, 46A and 46B, 46B, 46 are provided between the respective plates and layers described above.
B and 46B intervene.

In FIG. 7, each of the magnetic material layers 45A and 45B is depicted as three layers, but these layers may be appropriately laminated with three or more layers. The core 41 is configured by such a laminated structure. Also in this example, by providing the protrusion 42b, the same effect as in the example of FIG. 1 can be obtained.

The projecting portion of the core may be provided on the right side as shown in FIG. 1 or may be provided on the lower side (on the side opposite to the head gap) as shown in FIG. In FIG. 8, the parts corresponding to those in FIG. 1 are represented by adding reference numerals with “50” added.

The half piece 53 on the side where the window 55 is not provided is provided with a protruding portion 53b extending downward in FIG. Then, a concave portion 58 into which the holding tool 8 is inserted is provided in the substrate 57, and the core body 51
To the substrate 57. Others are shown in FIGS.
The same as in the example.

In FIG. 9, the core is sucked by a vacuum pad,
An example of supporting is shown. In FIG. 9, the parts corresponding to those of FIG.

In this example, the protrusion 62 extending from the half 62.
The b is made large so that the vacuum pad 70 can easily support it by suction. Others are the same as in the example of FIGS.

Although the embodiments of the present invention have been described above, various modifications can be added to the embodiments based on the technical idea of the present invention.

For example, the shape and material of the core may be any other suitable shape and material. The present invention can also be applied to magnetic heads other than VTRs for audio and office equipment.

[0031]

In the magnetic head according to the present invention, since the core body is provided with the protrusion for handling, the handling is reliable and easy, and the position of the magnetic head can be positioned with high accuracy. Moreover, since the undesired change in properties such as magnetostriction caused by the stress caused by handling is limited only to the protrusions, the function as the magnetic head is not adversely affected.

[Brief description of drawings]

FIG. 1 is a front view of a magnetic head core according to an embodiment.

FIG. 2 is a plan view of the same.

FIG. 3 is a plan view of the substrate on which the magnetic head is attached.

4 is a front view seen from the head gap side of FIG. 3. FIG.

FIG. 5 is a perspective view of a magnetic head core material.

FIG. 6 is a sectional view of a rotary head drum mechanism.

FIG. 7 is a front view of a magnetic head core according to another embodiment.

FIG. 8 is a plan view showing how to attach a magnetic head core according to still another embodiment to a substrate.

FIG. 9 is a perspective view of a magnetic head core according to still another embodiment.

FIG. 10 is a plan view of a substrate to which a conventional azimuth head is attached.

FIG. 11 is a front view showing handling of a conventional azimuth head.

FIG. 12 is a front view showing another handling of the same.

[Explanation of symbols]

1, 41, 51, 61 Magnetic head cores 2, 3, 41A, 41B, 52, 53, 62, 63 Core half pieces 2b, 3b, 42b, 52b, 62b Protrusions 4, 44, 54, 64 Head gap 5 , 45, 55, 65 Winding window 11 Core material 20 Cutting surface 21 Rotary head drum mechanism θ Azimuth angle

Claims (1)

[Claims] 1. A magnetic head having a core body provided with a protrusion for handling.