JP2542669B2 - Magnetic head, method of manufacturing the same, and case block for manufacturing magnetic head - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a magnetic head used in a magnetic recording / reproducing apparatus such as a magnetic tape recorder, a method for manufacturing the same, and a case block for manufacturing the magnetic head. Excellent,
The present invention relates to an inexpensive magnetic head that can be miniaturized and has good dimensional accuracy, a method for manufacturing the same, and a magnetic head case block used for manufacturing the same.

[Prior Art] Conventionally, a magnetic head of this type has an exploded perspective view of FIG.
As shown in the sectional views of FIGS. 10A and 10B, an I-shaped core 31 made of a magnetic material and a coil 32 wound around the core 31.
And a C-shaped core 36 that forms two magnetic gaps 35 between the terminals 33 fixed to the lower end of the coil 32 and the core 31 and both sides of the core 31 via gap plates 34.
And the tape sliding contact surface 37 together with the upper surface of the magnetic gap 35.
The front plate 38 is made of a non-magnetic material and constitutes a case 39 for connecting all these members.

The magnetic head described above has the I-shaped core 31
The coil 32 and the terminal 33 are attached to the magnetic gap 35
Is assembled via a gap plate 34 into a magnetic head structure A, and then the magnetic head structure A is made of a synthetic resin case 39.
The front plate 38 having the same hardness as the cores 31 and 36.
Place it on the top surface of case 39, and use adhesive
The tape was fixed to 39, and then the tape sliding contact surface 37 was ground into a predetermined shape and molded as shown in FIG.

Further, as another manufacturing method, there has been known a method in which the case 39, the front plate 38, and the magnetic head are coupled to each other by integral molding using a molding die, followed by polishing into a predetermined shape.

[Problems to be Solved by the Invention] However, in the above-described magnetic heads, magnetic heads are individually prepared, and each magnetic head is inserted in a case made of synthetic resin to manufacture the magnetic heads one by one. However, there is a drawback that productivity is poor and miniaturization is limited.

In particular, in the case of a magnetic head in which the voice track erasing head for VTR and the control track erasing head are integrated, two cores are provided on both sides of the front plate. However, since the shape is complicated, it has been desired to solve the above-mentioned problems as soon as possible.

The present invention has been made in view of the above drawbacks, and an object thereof is to provide a small and robust magnetic head having high dimensional accuracy, a method for manufacturing the magnetic head with high productivity, and a case block used for the same.

[Means for Solving the Problems] In order to solve the above problems, the present invention is directed to a magnetic head in which a sliding surface of a magnetic tape is mainly composed of a core made of a magnetic material and a front plate made of a non-magnetic material. A pair of cores are formed on both sides of the front plate so as to sandwich the front plate, and a partition plate abutting on the back surface of the front plate is provided on the back surface side of the front plate, and the pair of cores are provided. On the back side of the front plate, there is provided a resin-made filling material in which the core, the front plate and the partition plate are integrated.

Next, in the magnetic head of the present invention, the sliding contact surface of the magnetic tape is mainly composed of a core made of a magnetic material and a front plate made of a non-magnetic material, and the front plate is provided on both sides of the front plate. A pair of cores are formed so as to sandwich the core, and a resin-made filler that integrates the core, the front plate and the partition plate is provided on the back side of the pair of cores and the front plate, and the outer edge portion of the filler is provided. The outer plate may be provided so as to sandwich the front plate and the cores on both sides thereof from both sides thereof, and the front plate, the cores on both sides thereof, and the outer plate may be integrated by a filler.

Further, in the manufacturing method of the present invention, the sliding contact surface of the magnetic tape is a manufacturing method of a magnetic head mainly composed of a core made of a magnetic material and a front plate block made of a non-magnetic material. A pair of core blocks having a plurality of magnetic gaps formed adjacent to each other at a predetermined interval and a pair of back core blocks having a plurality of coils formed adjacent to each other at a predetermined interval, and a pair of core blocks on both sides of the front plate block. Also, a back core block is attached to the back side of the pair of core blocks, and each magnetic gap of the core block and each coil of the back core block are aligned and bonded so as to form a U shape as a whole. Forming a magnetic head block body, comprising a pair of wall plates,
An insertion space for inserting the back core material, the core block, and the front plate block is provided between the wall plates, and a plurality of holes aligned with each coil of the back core block are formed adjacent to each of the pair of wall plates. Using a case block, insert a back core block, a core block, and a front plate block into the insertion space of the case block, fill the gap with resin, and then cut along the cut surface passing through the hole with a predetermined cutting width. Then, the case block and the magnetic head block body are cut to manufacture a plurality of magnetic heads.

Further, in the case block of the present invention, a front plate block, a pair of core blocks adjacently formed with a plurality of magnetic gaps at a predetermined interval, and a pair of back cores adjacently formed with a plurality of coils at a predetermined interval. Using a block, a pair of core blocks on both sides of the front plate block, a back core block on the back side of the pair of core blocks, each magnetic gap of the core block and each coil of the back core block. After aligning and adhering so as to form a U shape as a whole, a magnetic head block body is formed, and this magnetic head block body is housed in a case block to fill the gap, and then cut with a cutting width of a predetermined dimension. Is a case block used when manufacturing individual magnetic heads, and is configured by including a pair of wall plates, and a front block is provided between the wall plates. An insertion space in which the back core material, the core block, and the front plate block can be inserted is formed, and an empty space that is aligned with each coil of the back core block and is slightly wider than the cut surface is formed in each of the pair of wall plates. A plurality of holes are formed adjacent to each other.

[Operation] In the magnetic head according to the present invention, since the partition plate in contact with the front plate is provided on the back side of the front plate having the cores on both sides, and these are integrated by the resin filler, The whole is solid, deformation due to resin shrinkage and expansion is prevented, and dimensional accuracy is good. Also, on the outer edge of the filler,
By providing the outer plates so as to sandwich the cores on both sides of the front plate, the end faces of the magnetic head can be accurately defined by these outer plates, and a magnetic head with higher dimensional accuracy can be provided.

In the magnetic head manufacturing method as described above, a core block in which a plurality of cores are continuously arranged in one direction is formed from the plurality of core blocks, the front plate block, and the back core block, and the core block is formed into a case block. A strong block body is manufactured by accommodating it in and filling the gap with resin. A large number of magnetic heads can be manufactured quickly and easily by cutting this block body with a predetermined width on a predetermined cut surface.

Further, according to the magnetic head case block as described above, since the cutting is performed along the holes of the case block at the time of cutting, the outer wall of the holes is cut off, and in the magnetic head, the case block end portion is cut off. The thickness is only the inner wall of the hole. As a result, a small magnetic head is manufactured without reducing the strength of the case block itself.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a magnetic head of an embodiment manufactured by using the method and case block of the present invention. Outer plates 1 and 1 and a central partition plate formed of synthetic resin, an outer plate 1 and a partition. Board 2
The cores 3 and 4, the coils (not shown) housed between the cores 3 and 4, and the back cores 5 and 6 of the cores 3 and 4, and the cores 3 and 4 that are in contact with the partition plate 2 Front plate 7,
Filler 8 such as glass or resin filling between these spaces
It consists of and. The cores 3 and 4 and the front plate 7 are made of materials having similar expansion coefficients.
4 is a combination of magnetic sintered ferrite and front plate 7 is made of non-magnetic ceramic material, or combination of cores 3 and 4 is made of magnetic sintered ferrite and front plate 7 is made of non-magnetic sintered ferrite, or A combination using Si-Al-Fe alloy for the cores 3 and 4 and non-magnetic sintered ferrite or ceramic for the front plate 7 is used. A magnetic gap 9 is formed in each of the cores 3 and 4, and in this example, the gap groove 9a forming the magnetic gap 9 reaches the front plate 7 in order to increase the bonding strength. If only the cores 3 and 4 are obtained, the cores 3 and 4 may be formed.

A method of manufacturing the above magnetic head will be described with reference to FIGS.

First, an upper core block material 14 in which a pair of magnetic gaps 13 in which the gap groove 11 is filled with glass 12 is formed in advance is sliced at a cross section orthogonal to the gap to form an upper core block 14a. Lower core block material 15 and front plate block material (ceramics) 16
Is similarly sliced to form the lower core block 15a and the front plate block 16a. Next, the upper and lower core blocks 1
The joint surfaces of 4a and 15a are ground and bonded to the joint surface of the front plate block 16a via glass or resin (see FIG. 5). On the other hand, as shown in FIG. 6, the back bobbin 20 and the coil 21 and the terminals are preliminarily provided in the back core block 19 in which the tooth portions 17 and 18 which should constitute the back cores 5 and 6 alternately project to form a comb tooth shape. A plurality of coil blocks 20a composed of 22 are alternately fixed, and the coil blocks 20a are bonded to the back surfaces of the upper core block 14a and the lower core block 15a by using glass or resin to form a magnetic head block body as shown in FIG. Make up 23. Then, this is housed in a case block 24 as shown in FIG. The case block 24 includes a top plate (wall plate) 25, a bottom plate (wall plate) 26, and a partition plate 27 between them.
Is connected to the side plate 28 to form a frame shape, and the top plate 25 and the bottom plate 26
The upper core block 14 in the space between the
The a and the lower core block 15a are dimensioned to be inserted together with the coil bobbin 20.

Then, the top plate 25 and the bottom plate 26 are formed with holes 29 having a rectangular cross section that penetrate the front and rear surfaces. Width L of this hole 29
Is a value slightly larger than the cutting width l described later. Next, the space formed between the case block 24 and the magnetic head block body 23 is filled with resin and solidified to form a magnetic head block (not shown). Then, this magnetic head block is cut along a cut surface parallel to the side plate 28 with a predetermined width 1 and the tape sliding contact surface is polished as shown in FIG. A plurality of head structures A are molded. At this time, as shown in the figure, since the cut surfaces come inside both side surfaces of the hole 29, only the inner plate 3 forming the hole 29 remains, which is the outer plate 1 of FIG.
Therefore, the manufactured magnetic head can be made smaller. The above cutting may be carried out by a mechanical wire cutting machine or a slitter machine, and a tape grinding surface (not shown) formed in the shape of a magnetic head is used to simultaneously grind and cut the tape sliding surface. You may do it.

If a non-shrinkable unsaturated resin is used for the filler 8 of the case block, the magnetic properties of the cores 3 and 4 are less deteriorated by the shrinkage and expansion of the resin. Further, since the coefficients of thermal expansion of the cores 3 and 4 and the front plate 7 are approximated to each other, dimensional accuracy can be maintained without deformation due to heat during fusion of glass or resin.

As described above in detail, in this embodiment, the case block is used to form the magnetic head block, so that the manufacturing thereof is quick and easy, and itself is solid. Further, since the partition plate is formed on the case block, the case block is solid, deformation due to contraction / expansion of the resin is prevented, and a magnetic block body with good dimensional accuracy is manufactured, and the resin is filled. Since the amount is small, the work time required for filling and solidifying can be reduced. Further, since holes are formed in the top plate and the bottom plate of the case block, there is an advantage that the product can be downsized while maintaining the strength of the case block.

[Effects of the Invention] As described above, according to the present invention, a partition plate is provided on the back surface side of a front plate having cores on both sides, and these core, front plate and partition plate are integrated with a resin filler. Since the partition plate is present and the core, the front plate and the partition plate are integrated with the resin filling material, the magnetic head itself can be made firm and deformation due to contraction and expansion of the resin filling material can be prevented. This can be prevented by the partition plate, and a magnetic head with high dimensional accuracy can be provided.

Further, in the present invention, an outer plate may be provided on the outer edge portion of the filling material to form the end surface of the magnetic head,
In that case, the end faces of the magnetic head can be accurately defined by these outer plates, and a magnetic head with higher dimensional accuracy can be provided.

The present invention is as described above. For the core and the front plate, one molded product is not prepared in advance for one magnetic head, but a plurality of core blocks and the front plate block are adhered to each other. The back core material is abutted against the core block of No. 1, these are housed in the case block, the gap is filled with resin, and then a large number of magnetic heads are obtained by cutting to a desired size, which is excellent in productivity. It is possible to inexpensively manufacture a large number of magnetic heads having stable quality, size, and shape without waste of materials. Further, a plurality of holes aligned with each coil of the back core block housed in the case block are formed adjacent to each wall plate of the case block,
Since the width of these holes is made wider than the cutting width, the case block, the back core block housed therein, the core block and the front plate block are cut at a predetermined cutting width along the cutting surface passing through the hole. By doing so, a magnetic head can be obtained, and the magnetic head obtained in this case has a size in which only the inner portions of the holes of each wall plate of the case block remain, so that the product can be manufactured while maintaining the above advantages. The size can be further reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing an outline of a magnetic head according to an embodiment of the present invention, FIG. 2 is a perspective view showing a method for manufacturing an upper core block, and FIG. 3 is a perspective view showing a method for manufacturing a lower core block. FIG. 4 is a perspective view showing a method of manufacturing the front plate block,
5 and 6 are perspective views showing a method of manufacturing the magnetic head block body, and FIG. 7 is a perspective view of the magnetic head block body.
8 is a perspective view showing a method of manufacturing a magnetic head block, FIG. 9 is a perspective view showing a method of manufacturing a conventional magnetic head, and FIG. 10 (a) is a sectional view showing a core portion of the conventional magnetic head. FIG. 10 (b) is a sectional view showing a front plate of a conventional magnetic head, and FIG. 11 is a perspective view showing an outline of the conventional magnetic head. 1 ... Outer plate, 2 ... Partition plate, 3,4 ... Core, 5,6 ... Back core, 7 ... Front plate, 8 ... Filler, 9 ... Magnetic gap, 14a ... Upper core Block, 15a …… Lower core block, 16a …… Front plate block, 19 …… Back core block, 2
1 ... Coil, 23 ... Magnetic head block body, 24 ... Case block, 25 ... Top plate (wall plate), 26 ... Bottom plate (wall plate), 27 ... Partition plate, 29 ... Hole, 30 …… Inner plate.

Claims (4)

(57) [Claims] 1. A magnetic head in which a sliding surface of a magnetic tape is mainly composed of a core made of a magnetic material and a front plate made of a non-magnetic material, and a pair of front and back plates sandwiching the front plate. A core is formed, and a partition plate abutting on the back surface of the front plate is provided on the back surface side of the front plate, and the core, the front plate and the partition plate are integrated on the back surface side of the pair of cores and the front plate. A magnetic head characterized in that it is provided with a resin-made filling material. 2. A magnetic head, wherein a sliding surface of a magnetic tape is mainly composed of a core made of a magnetic material and a front plate made of a non-magnetic material, and a pair of front and back plates sandwiching the front plate. The core is formed, and a resin-made filler that integrates the core, the front plate, and the partition plate is provided on the back side of the pair of cores and the front plate, and the front plate and the front plate are provided at the outer edge of the filler. A magnetic head characterized in that an outer plate is provided so as to sandwich the cores on both sides from both sides thereof, and the front plate, the cores and outer plates on both sides thereof are integrated by a filler. 3. A method of manufacturing a magnetic head, wherein a sliding surface of a magnetic tape is mainly composed of a core made of a magnetic material and a front plate made of a non-magnetic material, the front plate block and a plurality of magnetic gaps. A pair of core blocks adjacently formed at a predetermined interval, and a pair of back core blocks having a plurality of coils adjacently formed at a predetermined interval, on both sides of the front plate block, a pair of core blocks, and A back core block is attached to the back side of the pair of core blocks, and each magnetic gap of the core block and each coil of the back core block are aligned and bonded so as to form a U-shape as a whole to form a magnetic head block body. A pair of wall plates, and an insertion space in which the back core material, the core block and the front plate block can be inserted between the wall plates. In each case, a case block in which a plurality of holes aligned with each coil of the back core block are formed adjacently, the back core block, the core block and the front plate block are inserted into the insertion space of the case block, and After the resin is filled, a plurality of magnetic heads are manufactured by cutting the case block and the magnetic head block body with a predetermined cutting width along a cutting surface passing through the holes. Production method. 4. A front plate comprising: a front plate block; a pair of core blocks having a plurality of magnetic gaps formed adjacent to each other at predetermined intervals; and a pair of back core blocks having a plurality of coils formed adjacent to each other at predetermined intervals. A pair of core blocks are provided on both sides of the block, and a back core block is provided on the back side of the pair of core blocks. The magnetic head block body is formed by adhering in a letter shape, and the magnetic head block body is housed in the case block to fill the gaps, and then cut along a cutting width of a predetermined dimension to form individual magnetic head block bodies. A case block used for manufacturing a magnetic head, comprising a pair of wall plates, wherein the back core material and the core are provided between the wall plates. An insertion space into which the lock and the front plate block can be inserted is formed, and a plurality of holes that are aligned with each coil of the back core block and are slightly wider than the cutting width are formed adjacent to each other in the pair of wall plates. A magnetic head case block characterized by being formed.