JPH03219412A - Magnetic head - Google Patents

Abstract

PURPOSE:To position a magnetic core on a substrate extremely accurately by providing an engagement part which engages a magnetic core with the substrate and positions this core. CONSTITUTION:A recessed part 1c is formed in the reverse surface of a tip part 1a where the magnetic core 2 is fixed and this recessed part 1c is formed rectangularly on the whole so as to form the tip edge of the tip part 1a and two flanks 1d and 1e in an L shape from the tip edge. When the magnetic core 2 is fixed, the reverse surface of the magnetic core 2 is made to abut on the bottom surface of the recessed part 1c of the substrate 1, the rear end surface 2d and one flank 2e of the magnetic core 2 are pressed against the two flanks 1d and 1e of the recessed part 1c, and the magnetic core 2 is engaged with the recessed part 1c, positioned, and fixed by adhesion. Consequently, neither observation nor measurement is required to position the magnetic core 2 and the magnetic core 2 is only engaged with the recessed part 1c and thus positioned extremely easily to facilitate the assembling process of the magnetic core.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to an inductive magnetic head that magnetically records or reproduces information by bringing a magnetic core into sliding contact with a magnetic recording medium, and particularly relates to an inductive magnetic head that magnetically records or reproduces information by bringing a magnetic core into sliding contact with a magnetic recording medium. The present invention relates to a magnetic head in which a magnetic core is adhesively fixed to a substrate.

[Prior Art] This type of magnetic head includes a video magnetic head for a VTR (video tape recorder). FIG. 6 shows a conventional video magnetic head.

In FIG. 6, reference numeral 2 denotes a magnetic core, which is formed from a high permeability magnetic material into a substantially rectangular chip shape, and has a magnetic gap 2a formed at its tip. Also magnetic core 2
A winding window 2b is formed in the magnetic core 2, and a coil winding (not shown) is wound around the magnetic core 2 through this winding window 2b.

Further, in FIG. 6, reference numeral 1 denotes a substrate that supports the magnetic core 2, and the magnetic core 2 is bonded and fixed to the flat lower surface of the tip portion 1a of the substrate 1, which is formed in a protruding trapezoidal shape.

The magnetic core 2 has symbols Lx and L with respect to the tip end 1a of the substrate 1.
It is positioned and bonded at a predetermined position determined by the y dimension. A screw hole 1b is formed in the center of the board 1, and the board 1 is connected to a VT (not shown) through this screw hole 1b.
It is fixed to the rotating cylinder R with screws.

[Problems to be Solved by the Invention] By the way, when determining the fixing position of the magnetic core 2 on the substrate 1 with the above-mentioned conventional video magnetic head, it is necessary to fix the magnetic core 2 on the substrate 1 in different arrow directions y, z, and z, as shown in FIG. Observation lens 10
The position of the magnetic core 2 on the substrate l is observed and measured, and the position of the magnetic core 2 in the x and y directions is adjusted so that the dimensions Lx and Ly shown in FIG. 6 match predetermined values, respectively. There is. Note that in FIG. 7, the images of the magnetic core 2 observed from the directions of arrows y, z, and z' are designated by symbols 11a, llb, and 11b, respectively.
It is indicated by llc. After positioning in this way, the magnetic core 2 is glued and fixed on the substrate 1, and then the position of the magnetic core 2 on the substrate 1 is observed and measured again with the lens 1o to check for defects in the fixing position. There is.

However, in the conventional video magnetic head assembly process, it is difficult to observe, measure, and adjust the position of the magnetic core as described above, and the manufacturing cost increases accordingly. There is a problem in that it is not possible to completely prevent the occurrence of a core fixing position failure, resulting in a poor yield and an increase in manufacturing costs.

SUMMARY OF THE INVENTION An object of the present invention is to enable easy and accurate positioning of the magnetic core on the substrate in this type of magnetic head.

[Means for Solving the Problems 1] In order to solve the above problems, according to the present invention, a structure is adopted in which an engaging portion is provided for engaging and positioning the core.

[Function] According to such a structure, the magnetic core can be easily and accurately positioned simply by engaging the magnetic core with the engaging portion of the substrate.

[Example] Hereinafter, details of embodiments of the present invention will be described with reference to the drawings.

Here, an embodiment of a video magnetic head for a VTR is illustrated, and in the drawings of the embodiment, parts common or corresponding to those in FIGS. 6 and 7 of the conventional example are denoted by common reference numerals.
Explanation of common parts will be omitted.

First Embodiment FIG. 1 shows a positioning structure for a magnetic core of a video magnetic head according to a first embodiment of the present invention.

In Fig. 1, the magnetic core 2 is the same as the conventional example, but the substrate 1 is different from the conventional example, and a recess 1c is formed on the lower surface (upper surface in the figure) of the tip 1a that fixes the magnetic core 2. . The recessed portion 1c is formed into a rectangular shape as a whole so that two L-shaped side surfaces 1d and le are formed from the tip edge of the tip portion 1a and the edge on the near side in the drawing.

Under such a structure, when fixing the magnetic core 2, the lower surface of the magnetic core 2 in the figure is placed on the bottom surface of the recess 1c of the substrate 1, and the rear end surface 2d and one side surface 2e of the magnetic core 2 are placed on the two side surfaces of the recess 1c. 1d and le, the magnetic core 2 is positioned by engaging with the four parts 1c, and the magnetic core 2 is fixed by adhering to the recessed part 1c.

According to such a positioning structure, it is not necessary to observe or measure the position of the magnetic core 2 as in the conventional method in order to position the magnetic core 2, and it is extremely easy to position the magnetic core 2 by simply engaging the magnetic core 2 with the recess 1c. Positioning can be performed and the assembly process of the magnetic head can be simplified. Moreover, the recess 1 in the substrate 1
Since the positions of the side surfaces 1d and 1e of c can be strictly controlled, the magnetic core 2 can be positioned at a predetermined position with high precision, the problem of fixing position failure of the magnetic core 2 can be eliminated, and the yield of magnetic heads can be improved.

Second Embodiment Next, FIG. 2 shows a positioning structure for a magnetic core of a video magnetic head according to a second embodiment of the present invention. As shown in FIG. 2, in this embodiment, the concave portion IC of the substrate l for positioning the magnetic core 2 is formed as a whole so that three U-shaped sides 1d to 1f are formed from the tip edge of the rod portion 1a. It is formed into a rectangle.

Under such a structure, when fixing the magnetic core 2, the lower surface of the magnetic core 2 in the figure is placed on the bottom surface of the four parts 1c of the substrate 1, and the rear end surface 2d and one side surface 2e of the magnetic core 2 are placed on the side surface 1d of the recess 1c. , 1e, or by pressing the rear end surface 2d and the other side surface 2f of the magnetic core 2 against the side surfaces 1d and 1f of the recess 1c to engage and position the magnetic core 2 with the recess IC. It shall be fixed by adhering to the recessed IC.

In this manner, the magnetic core 2 can be easily and accurately positioned in this embodiment as well as in the first embodiment, and the same effects can be obtained. Note that the width W2 of the recess IC and the width W1 of the magnetic core 2
Needless to say, the difference is smaller than the permissible value of the positional deviation of the magnetic core 2.

Third Embodiment Next, FIG. 3 shows the structure of a substrate for positioning the magnetic core of a video magnetic head according to a third embodiment of the present invention. In this embodiment, as shown in FIG.
11 are formed, and by inserting and planting bottles 38 to 3c into the holes 1g to 11, respectively, three protrusions are provided at the tip portion 1a.

Under such a structure, when fixing the magnetic core 2 shown in FIGS. 1 and 2 to the substrate 1 shown in FIG. upper surface), and the rear end surface 2d and one side surface 2e of the magnetic core 2 are placed on the bins 3c and 3.
Press the magnetic core 2 onto the protrusions of bottles 3a and 3b.
C, and the magnetic core 2 is fixed by adhering to the tip portion 1a.

In this way, the magnetic core 2 can be easily and accurately positioned in this embodiment as well as in the first and second embodiments, and the same effects can be obtained.

Fourth Embodiment Next, FIG. 4 shows the structure of a substrate for positioning the magnetic core of a video magnetic head according to a fourth embodiment of the present invention. As shown in FIG. 4, in this embodiment, in addition to the bottles 3a to 3C being implanted on the tip 1a of the substrate 1 as in the third embodiment, two bottles 3d and 3e are also installed as the bottles 3a and 3b. They are implanted at the tip portions 1a facing each other. It is assumed that the interval W2° between the bins 3a, 3b and 3d, 3e is slightly larger than the width W1 of the magnetic core 2.

Under such a structure, when fixing the magnetic core 2 shown in FIG. 2 to the substrate 1 shown in FIG. , magnetic core 2
The rear end surface 2d and one side surface 2e are attached to the bins 3C, 3a and 3b.
or by pressing the rear end surface 2d and the other side surface 2f of the magnetic core 2 against the bins 3c, 3d, and 3e to engage and position the magnetic core 2 with the bins 3a to 3c or 3c to 3e. It is assumed that the core 2 is adhered and fixed to the tip portion 1a.

In this way, the magnetic core 2 can be easily and accurately positioned in this embodiment as well as in the first to third embodiments.
A similar effect can be obtained.

In the third and fourth embodiments described above, a plurality of protrusions are provided on the tip 1a of the substrate 1 using the pins 3a to 3e as engaging portions for positioning the magnetic core 2, but as another embodiment, a fifth As shown in the figure, the protrusion 4 is attached to the tip 1a of the substrate 1.
Alternatively, the magnetic core 2 may be engaged with the protrusion 4 for positioning.

[Effects of the Invention] As is clear from the above description, according to the present invention, a chip-shaped magnetic core is bonded and fixed to a substrate.
In the magnetic head that leaks, we have adopted a structure in which the front board is provided with an engaging part for engaging and positioning the first magnetic core, making it extremely easy and accurate to position the magnetic core with respect to the board. This has the advantage of simplifying the assembly process of the magnetic head, improving yield, and significantly reducing costs.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 show a first embodiment and a second embodiment of the present invention, respectively.
A perspective view of a magnetic core and a substrate showing a magnetic core positioning structure of a video magnetic head according to an embodiment. FIG. 0, FIG. 3, and FIG. 4 show a magnetic core positioning structure according to a third embodiment and a fourth embodiment, respectively. A perspective view of the board,
FIG. 5 is a perspective view of a substrate according to another embodiment, FIG. 6 is a plan view of a conventional video magnetic head, and FIG. 7 is an explanatory diagram of a method for positioning the magnetic core in the conventional head. l...Substrate 1c...Recess 2...Magnetic cores 3a to 3e...Bin (protrusion) 4...Protrusion

Claims (1)

[Claims] 1) In a magnetic head in which a chip-shaped magnetic core is bonded and fixed to a substrate, the substrate is provided with an engaging portion for engaging the magnetic core and positioning the core. A magnetic head characterized by: 2) The magnetic head according to claim 1, wherein a recess is provided in the substrate as the engaging portion. 3) The magnetic head according to claim 1, wherein a convex portion is provided on the substrate as the engaging portion.