JP3338260B2 - Magnetic head and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head in which a core half joined and combined via a gap is housed in a case, and a method of manufacturing the magnetic head.

[0002]

2. Description of the Related Art FIG. 15 is a sectional view showing a conventional magnetic head for reproducing a magnetic tape. The magnetic head shown in FIG. 15 has a pair of core halves 2 and 3 that are joined to each other in a shield case 1. Two sets of core joined bodies in which the core halves 2 and 3 are joined are provided, and one set of core joined bodies is for the R (right) channel and the other set of core joined bodies is L ( Left) For channels. In addition, a shield plate 4 and a shield plate 5 are provided between an R channel core half and an L channel core half provided adjacent to each other in a direction perpendicular to the plane of FIG. Both shield plates 4 and 5 are half, and core half 2
In the gap joint G between the two shield plates 4 and 5
Are joined together.

[0003] Core half 2 and shield plate 4 on the left side of the figure
Is held by a holder 6 formed of a non-magnetic material,
The core half 3 and the shield plate 5 on the right side in the figure are held by a holder 7 also made of a non-magnetic material.
Respective holders 6 and 7 provided on the left and right sides in the figure
Are held together by a clip (not shown) in a combined state, and are housed in the shield case 1. This combination is pressed in the shield case 1 by the leaf spring 8 in the left direction in the figure, and the holders 6 and 7 and the core halves 2 and 3 held by the holders are positioned. In addition, a bobbin 10 around which a coil 9 is wound is extrapolated to a joining portion of the base ends of the core halves 2 and 3,
Terminals 11 provided on the bobbin 10 protrude rearward of the shield case 1.

When the assembly shown in FIG. 15 is completed, the shield case 1 is filled with a resin material such as an epoxy resin, and each component in the shield case 1 is fixed. Then, the front surface of the shield case 1 is polished to form a sliding surface indicated by S. The gap joint G of the core half of each of the R and L channels appears on the sliding surface S.

[0005]

In the conventional magnetic head shown in FIG. 15, one core half 2 and the other core half 3 are held by separate holders 6 and 7, respectively.
And 7 are housed in the shield case 1 in a combined state. Since the right and left holders 6 and 7 are used as described above, the number of parts increases.

Further, in the manufacturing method, in a state where the core half 2 for each channel and the shield plate 4 are incorporated in one holder 6, the gap joint G of each core half 2 is formed.
In addition, the rear end joint g and the shield plate 4 are polished so that they are all on the same plane. The same applies to the other holder 7, where the core half 3 and the shield plate 5 of each channel are held, and the gap joint G and the joint (rear end) g of each core half 3 and the shield plate 5 is polished to be the same surface. Then, a gap material of a non-magnetic material is interposed in the gap joint G, the core halves 2 and 3 are joined, and the holders 6 and 7 are combined.

As described above, in a state where the core halves 2 and 3 on both sides are held and fixed by the holders 6 and 7, respectively, the gap joint G is polished, and then the holders 6 and 7 are combined. Therefore, if the holders 6 and 7 in the shield case 1 are not combined with each other with high accuracy, the core halves 2 and 3 having the flat surfaces polished may be used.
Cannot be reliably joined at the gap joining portion G, and the gap length between the core halves 2 and 3 may vary between channels.

Conventionally, a gap plate made of a non-magnetic material is interposed between the core halves 2 and 3 at the gap joint G. However, this gap plate is expensive, and a jig or the like is required when the gap material is interposed in the gap joint G between the core halves 2 and 3, so that both the component cost and the manufacturing cost are increased. I have. Also, if there is a variation in the thickness of the gap material, the gap length of the gap junction G between the channels tends to vary.

As described above, in the conventional magnetic head, since the core halves are fixed to the holders 6 and 7 and polished for each half, and then bonded, the bonding accuracy at the gap bonding portion varies. Is likely to occur, and because the thickness accuracy of the gap plate tends to vary,
A gap length differs between the channels, and as a result, an output difference easily occurs between the channels. For this reason, conventionally, it is necessary to adjust the reproduction output of each channel by using an individual variable resistor to eliminate the output difference between the channels. This adjustment circuit is required, and an adjustment work is required, which increases the number of steps. .

Recently, without using the gap plate, after polishing the joint of one core half, a non-magnetic material is formed on the polished surface by sputtering or the like, and the gap layer of the non-magnetic material is formed. A method of joining the core halves together via the core has been considered. However, in the one shown in FIG.
The core half and the shield plate for each channel are held and fixed to the holder 6 or 7, and the non-magnetic material is sputtered on the polished surface after planar polishing. Therefore, it is necessary to install not only the core halves but also a holder in the sputtering apparatus, and the number of core halves for which film formation can be completed by the sputtering process is limited, resulting in a poor production yield.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a magnetic head in which the joining accuracy of the core halves is increased so that the accuracy of the gap length at the gap joining portion of the core halves can be increased. It is intended to provide a manufacturing method thereof.

Further, according to the present invention, when a non-magnetic material is deposited on a gap junction of a core half by sputtering or the like, the number of processing of the core half in the sputtering step can be increased, and the deposited non-magnetic material can be formed. It is an object of the present invention to provide a magnetic head and a method of manufacturing the same, in which gap accuracy is improved by using a material, and it is possible to eliminate adjustment of an output difference between channels in a completed magnetic head.

[0013]

Means for Solving the Problems The present invention, first core half and the second core half is paired with each other, a plurality of sets stored in the case, the surface of the case, each set In the magnetic head in which the joining gap of the core halves appears, the first core halves are respectively positioned and installed in the case, and the plurality of second core halves are connected to each other by a connecting member.
The second core half and the linking the second core half
A connecting member is housed in the case, and the connecting member is
It is formed of a leaf spring material and is formed integrally with the connecting member.
The second core half is directly pressed by the spring,
It is characterized by being pressure-bonded to one core half . Preferably, the connecting member has a second core half.
A plurality of springs corresponding to each of the bodies are integrally formed
Individual second core halves with each said spring
Are individually suppressed.

In the above means, since the second core half is directly pressed by the spring and joined to the first core half positioned in the case, the second core half is joined. Can be eliminated, the number of parts can be reduced, and the second core halves are individually joined to the first core halves. Adhesion can be ensured, and joining accuracy at the gap joining portion can be increased.

Further, according to the present invention, a plurality of pairs of first and second core halves are housed in a case, and a joining gap of each pair of core halves appears on the surface of the case. in head, the first core half is placed is positioned within the case each the plurality of second core halves are connected to each other by a connecting member, said second core halves and child
The connecting member for connecting them is housed in a case, and
The second core half is formed by a spring housed in a flexible case.
It is characterized in that the body is directly pressed and joined to the first core half by pressure.

In this magnetic head, the second core halves are connected to each other by a connecting member such as a plate member or a block interposer without using a holder, and each of the second core halves is connected to the first half by a spring. To the core half. Therefore, the individual core halves are joined to each other with high precision, and it is possible to prevent variations in the gap length in the magnetic gap (junction gap).

In the above, the connecting member includes a magnetic material for magnetically shielding between the plurality of second core halves, and the magnetic material is connected to each of the second core halves via a non-magnetic material layer. It is possible that In this configuration, since the connecting member and the shield plate can be shared,
The work of mounting the shield plate becomes unnecessary.

Further, the connecting member is formed by bending a plate material, and each of the connecting members has an individual second
Are connected to each other. In this configuration, the connecting member fits within the interval between the core halves, and the connecting member and the connecting body of the core halves are smaller than those using a conventional holder. Therefore, the number of core halves that can be processed by one sputtering step can be increased when the gap member is formed by sputtering or the like with respect to the connected member and core half.

[0019]

Further, by forming the first core as a C-type core and the second core as an I-type core, the second core half is formed as the first core.
When the two core halves are pressed against each other, the joining of the two core halves is stabilized. That is, if the I-type core is configured to be pressed by a spring,
The distance between the joint surface between the core halves and the point of pressing by the spring is shortened, and the second core half pressed by the spring is stabilized.

In the above, it is preferable to form a gap layer made of a non-magnetic material on the joint surface of the second core half with the first core half. In the present invention, the second
In a state where the core halves are connected alone or in plurals,
Since the gap layer can be formed without using a holder, the number of core halves that can be processed in one film forming step can be increased when the gap layer is formed by sputtering or the like.

[0022]

[0023]

[0024]

[0025]

[0026]

[0027]

[0028]

[0029]

1A and 1B show a magnetic head according to a first configuration example of the present invention. FIG. 1A is a longitudinal sectional view cut along a surface along a sliding direction of a magnetic tape, and FIG. Is B in (A)
FIG. 2 is a cross-sectional view taken along the line B, and FIG. 2 is an exploded perspective view showing the structure of components in the shield case. The magnetic head reproduces (or records) a stereo audio signal recorded on a magnetic tape, and includes a core for an R (right) channel, a core for an L (left) channel, and a core for each channel. The coil for detecting the magnetic field of the above is housed. In addition, the core of each channel is configured as a core joined body in which the first core half and the second core half are joined via a joining gap.

The shield case 21 is made of Fe-Ni-Mo.
It is formed by pressing a magnetic material such as an alloy. Inside the one side plate 21a of the shield case 21, a holder 22 is housed. This holder 2
Reference numeral 2 denotes a die-cast molding made of a non-magnetic alloy material or an injection molding made of a polymer material.

As shown in FIG. 2A, the holder 22 holds a first core half 23L for the L channel and a first core half 23R for the R channel. First
Each of the core halves 23L and 23R is a so-called laminated core in which a plurality of thin plates made of an Fe—Ni—Nb alloy or the like are stacked and fixed to each other. The first core halves 23L and 23R are C-shaped cores. The core half 23L is fitted to the positioning step 22a and the positioning recess 22b formed in the holder 22, positioned and held and fixed,
The other core half 23R is also fitted and positioned and held and fixed to the positioning step 22c and the positioning recess 22d formed in the holder 22.

A shield plate 24 is provided between the first core halves 23L and 23R. Shield plate 24
Is set between the two core halves 23R and 23L and is positioned in the groove 22e formed in the holder 22. This shield plate 24 is made of the same Fe-
A non-magnetic material layer is laminated on both sides of a magnetic metal plate such as a Ni-Mo alloy. Magnetic insulation is achieved by interposing a shield plate 24 between both core halves 23L and 23R. Will be

Each of the core halves 23L and 23R is attached to the holder 2
While being positioned and held at the position 2, it is fixed to the holder 22 with a resin material or the like. Then, in this state, the surface is polished so that the joint surfaces (a) and (b) with the other core half are all on the same plane. In the example shown in FIGS. 1 and 2, the shield plate 24 is provided not only between the first core halves 23L and 23R but also as a second core half 2 described later.
It extends between 5L and 25R. Therefore, the shield plate 24 includes the first core halves 23L and 23R and the second core half 23L and 23R.
After the core halves 25L and 25R are assembled, they are inserted into the shield case 21 later.

As shown in FIG. 2B, the second core halves 25L and 25R are I-shaped cores, and are made of a magnetic material such as the same Fe-Ni-Nb alloy as the first core halves 23L and 23R. It is a laminated core in which thin plates of material are laminated. The core half 25L is for the L channel, and is joined to the first core half 23L. The core half 25R is for the R channel, and is joined to the first core half 23R.

In the present invention, the first core halves 23L and 23L
While the joint surfaces (a) and (b) are planarly polished in a state where R is held by the holder 22, the second core halves 25L and 25R are each used alone as the joint surfaces (c) and (c). (D) is polished, and a gap layer made of a nonmagnetic material such as SiO ₂ is formed on the polished surface (c) by a sputtering process. The polished surface (d) is masked in the film forming step so that the non-magnetic material does not adhere to the polished surface (d). For example, in a state where a plurality of the core halves 25L and 25R are arranged, a plurality of the core halves 25L and 25R are planarly polished so that the joint surfaces (c) and (d) become the same surface, and thereafter, a plurality of cores are arranged. A non-magnetic material is sputtered on the halves 25L and 25R at the same time, and a gap layer is formed on the joint surface (c). Since the core halves 25L and 25R are independently formed with the gap material formed on the joint surface (c),
In one sputtering step, a film forming process can be performed on a larger number of core halves, and the production efficiency of the second core halves can be increased.

In a state where the second core halves 25L and 25R are assembled in the shield case 21 (c).
And (d) are respectively bonded to the bonding surfaces (a) and (b) of the first core halves 23L and 23R. In this connection, the elastic force of the elastic member 26 is used. The resilient member 26 is made of a non-magnetic leaf spring material such as a non-magnetic stainless steel alloy. The resilient member 26 is integrally formed with a spring 26a for pressing the second core halves 25L and 25R against the first core halves 23L and 23R. The spring 26a is connected to the core halves 25L and 2L.
5R and the inner surface of the side plate 21b of the shield case 21. The spring 26a allows the core half 25L to be interposed.
And 25R are repressed from the back to form core halves 23L and 2L.
Pressurized to 3R.

A pair of claws 26b, 26b are formed on both left and right sides of the elastic member 26, respectively. When the resilient member 26 is installed on the back of the core halves 25L and 25R, the claws 26b, 26b on one side
And the claws 26b, 26b on the other side hit the side surfaces of the core half 25R, and the respective core halves 25L and 25R
Is determined. That is, the repression member 2
Reference numeral 6 has a function as a positioning member or a connecting member for positioning the pair of second cores 25L and 25R with each other. The resilient member 26 has two core halves 25L and 2L.
A projection corresponding to the inner surface on the opposite side of 5R may be formed. The positioning portion 26c is provided at the base of the resilient member 26.
Are formed in a U-shape.
By fitting 6 c to the rear end of the other side plate 21 b of the shield case 21, the resilient member 26 is positioned and installed in the shield case 21.

In the magnetic head assembled as shown in FIGS. 1A and 1B, the first core halves 23L and 23L
L-shaped rising portions 23La and 2 at the respective bases of R
A bobbin 27L for the L channel and a bobbin 27R for the R channel are extrapolated to 3Ra. Each bobbin 2
A coil 28 for reproduction (or recording) is wound around 7L and 27R. Reference numeral 29 denotes a terminal protruding from the respective bobbins 27L and 27R to the outside of the shield case 21, and an end of the winding of the coil 28 is connected to the terminal 29.

As described above, the method of manufacturing the magnetic head shown in FIGS. 1 and 2 includes the following steps. A step of incorporating the first core halves 23L and 23R into the holder 22, fixing them with a resin material, and flattening the joint surfaces (a) and (b) of the core halves 23L and 23R; The bonding surfaces (c) and (d) are individually polished on 25L and 25R individually, and the bonding surfaces (c) and (d) of a plurality of core halves 25L and 25R are arranged.
(Or a step of forming a gap layer by sputtering a non-magnetic material on at least the bonding surface (c) (the bonding surface (d) is preferably masked during the film formation));

The holder 22, the assembly of the core halves 23L and 23R, the second core halves 25L and 25R, and the resilient member 26 are put into the shield case 21, and the first core halves 23L and 23R and the second Core half 25L and 2
5R and the second core halves 25L and 25R are pressure-bonded to the first core halves 23L and 23R by the spring 26a of the elastic member 26. With the 23R and the second core halves 25L and 25R housed in the shield case 21, the shield plate 24 is inserted from the opening at the rear end of the shield case 21 and inserted into the groove 22e of the holder 22, Between the core halves 23L and 23R and the core halves 25
Step of inserting between L and 25R, filling the shield case 21 with a resin material and fixing each part in the shield case 21, and then polishing the front surface of the shield case 21 and sliding with the magnetic tape Forming a surface S;

In the completed magnetic head of the present invention, the second
Core halves 25L and 25R are individually joined to the first core halves 23L and 23R, respectively.
L, 25R, and a spring 26a interposed between the inner surface of the shield case 21 and the second core halves 25L, 25L.
R is elastically pressed individually to the first core halves 23L and 23R. Therefore, the second core halves 25L, 25L
The bonding surfaces of the first core halves 23L and 23R polished so that the bonding surfaces (c) and (d) of R are the same surface (a).
(B) The pressure bonding is reliably performed without any one-sided contact. In addition, since a gap layer having a small thickness is formed on the joining surface (c) by sputtering with high accuracy, the gap length of the joining gap G where the joining surfaces (a) and (c) are joined is formed. Can be set with high accuracy. Therefore, a difference in reproduction output between the R channel and the L channel hardly occurs, and a circuit for adjusting a difference in output between channels and an adjustment operation can be eliminated.

Instead of forming the gap layers on the core halves 25L and 25R, the core halves 23L and 23R
And a structure in which a gap plate is interposed between the core halves 25L and 25R, there is an effect that the joining accuracy between the core halves can be increased. As shown in FIGS. 1 and 2, when the second core halves 25L and 25R are I-shaped cores and the core halves are pressurized by a spring 26a,
From the point of application of the pressing force by the spring 26a, the joining surface (c)
The distance to (d) becomes short, and the core half 2
A stable elastic pressurization can be realized without a falling force acting on 5L and 25R.

FIGS. 3 and 4 show a modification of the configuration example shown in FIGS. 1 and 2. FIG. Although FIGS. 3 and 4 show only the second core halves 25L and 25R, the structures of the first core halves 23L and 23R, the holder 22, and other members such as the shield case 21 are not shown. 1 and FIG. FIGS. 3 and 4 show connecting members 31 and 32 connecting the second core halves 25L and 25R.
However, each of the connecting members 31 and 32 also exerts a function as a resilient member for individually repressing each of the core halves 25L and 25R.

The connecting member 31 shown in FIG. 3 is formed of a non-magnetic leaf spring material. This connecting member 31 is a spring 31a whose center is curved in a convex curved shape, and two sets of holding portions 31b, 31b and holding portions 31c, 31
c is formed. The second core half 25L is elastically held by one of the holding portions 31b and 31b,
The other second core half 25R includes holding portions 31c and 31c.
It is held elastically. Connecting member 32 shown in FIG.
Is a spring 32a which is curved in a convex curved shape as a whole, and both ends thereof are respectively fitted in fitting grooves 25La and 25La formed in the core half 25L, and a fitting formed in the core half 25R. It is fitted in the mating grooves 25Ra and 25Ra.

In the embodiment shown in FIGS. 3 and 4, the second core halves 25L and 25R are connected to the connecting member 31 or the connecting member 32.
And are connected to each other and assembled into a shield case 21 shown in FIG. Therefore, the work of assembling into the shield case 21 is easy. Also, when incorporated in the shield case 21, the springs 31a or 32a hit the inner surface of the side plate 21b of the shield case 21, and the cores 25L and 25R are turned into the first core halves 23L and 23R by the deformation of the springs 31a or 32a. On the other hand, it is elastically pressed. Here, in the connecting member 31 shown in FIG. 3, the spring 31a is separated into the core half 25L side and the core half 25R side by the groove 31d. Similarly, in the connecting member 32 shown in FIG. 4, the spring 32a is separated into the core half 25L and the core half 25R by the groove 32b. Due to this spring structure, the core half 25L is used in both FIG. 3 and FIG.
And the core halves 25R are individually pressed against the first core halves 23L and 23R by substantially independent spring forces.
Therefore, due to an error in the press molding accuracy of the connecting members 31 and 32, in the holding state shown in FIGS.
Even if there is a relative displacement between the core half 25R and the core half 25R, the joining surfaces (c) and (d) of the core half 25L and the core half 25R are respectively the first core half 23L and the core half 25R. The surface is securely brought into contact with the bonding surfaces (a) and (b) of the half body 23R and is pressed.

FIG. 5 and FIG. 6 show still another modification of the configuration example shown in FIG. 1 and FIG. In the example shown in FIG. 5, a connecting member 33 that connects the two core halves is provided between the second core half 25L and the second core half 25R. The connecting member 33 is formed by bending a metal plate, and the core halves 25L and 25R are adhered and fixed to the outer surfaces of the side plates 33a and 33b facing each other at an angle. Alternatively, the core half 25L and the core half 25R may be fixed to the connecting member 33 by laser welding.

In the example shown in FIG. 5, when the core half 25L and the core half 25R are connected by the connecting member 33, the joint surfaces (c) and (d) of the core half 25L and the core half 2
The joint surfaces (c) and (d) are non-magnetic with respect to the joint surfaces (c) and (d) while the core halves 25L and 25R are connected. The material is sputtered to form a gap layer. Core half 25
The L and the core half 25R are connected by a small-sized connecting member 33 connecting between them, and the size of the connecting body composed of the core halves 25L and 25R and the connecting member 33 is reduced. Therefore, a gap layer can be formed on a large number of connectors by a single sputtering process, and the number of film formation processes can be increased.

Further, by making the connecting member 33 include a magnetic metal, the connecting member 33 can function as a shield member. However, when the entire connecting member 33 is made of a magnetic material, the magnetic flux of the core half escapes to the connecting member 33. Therefore, the connecting member 33 is mainly composed of a plate made of a magnetic material, and a laminated plate (cladding material) in which a nonmagnetic material layer is laminated on the outer surface to which the core halves 25L and 25R are connected.
Or a nonmagnetic material film formed on the outer surface of a magnetic material plate by sputtering or the like. Alternatively, the connecting member 33 may be formed of a magnetic material, and a separate plate of a thin nonmagnetic material may be interposed between the connecting member 33 and each of the core halves 25L and 25R.

The second core halves 25L and 25R connected to each other as shown in FIG. 5 are connected to the first core half 23L by a spring 26a of an elastic member 26 as shown in FIG. 2B, for example. 23R, the core assembly for the R channel is placed in the shield case 21 in the same manner as shown in FIG.
A core assembly for the channel is formed. After being assembled in the shield case 21 and fixed with a resin material or the like, the front surface of the shield case 21 is polished to form a sliding surface. In FIG.
Indicated by. In the case shown in FIG. 5, if the connecting member 33 is formed of a magnetic material and functions as a shield plate, the first core halves 23L and 23R
The shield plate 24 located between the second core half 25
It is not necessary to extend to the L and 25R sides.

FIG. 6 shows a second core half 25 similar to FIG.
The structure which connected L and 25R with the connection member is shown. In this example, a laminate material 25 in which thin plates of a magnetic material are laminated is bent to form a pair of second core halves 25L and 25R. A connection member 34 formed by bending a sheet metal is provided inside the laminate material 25. For example, the connecting member 34 may be bent in advance into a substantially triangular shape, and the laminate 25 may be bent along the outer surface of the connecting member 34. Alternatively, the laminate 25 and the sheet metal forming the connecting member 34 may be bent. May be laminated and fixed to each other by laser welding or the like, and the laminate 25 and the sheet metal may be bent together to form the shape shown in FIG.

The one shown in FIG. 6 is incorporated into the shield case 21 shown in FIG. 1 and fixed with a resin material, and the sliding surface is polished and separated into the core halves 25L and 25R. The sliding surface is indicated by S in FIG.
When the sliding surface S is polished, the bent portion 34 of the connecting member 34
By leaving a part of the thickness of c, the bent portion 34c of the connecting member 34 is exposed on the sliding surface S of the magnetic head, so that the resin material can be prevented from being exposed, and the adhesion of magnetic powder can be prevented. It will be. When the sliding surface S is polished, the laminate 2
5 is separated into core halves 25L and 25R, and the core halves 25L and 25R come into close contact with the angled side surfaces 34a and 34b of the connecting member 34.

In FIG. 6, the connecting member 34 is formed of a material in which a nonmagnetic material layer is formed on the outer surface of a magnetic material, and the connecting member 34 functions as a magnetic shield member between the core halves 25L and 25R. Is also good. When the connecting member 34 is formed of a non-magnetic material, a shield plate 35 fitted to the connecting member 34 may be separately provided.

FIGS. 7 and 8 show still another embodiment of the present invention. FIG. 7 is a sectional view taken along a plane along the sliding direction of the magnetic tape, and FIG. FIG. 7 and 8 have the same basic structure as those shown in FIGS. 1 and 2, but in FIGS. 1 and 2, the second core half is an I-shaped core. On the other hand, the difference between FIGS. 7 and 8 is that the second core half is a C-shaped core.

As shown in FIG. 7, a first core half 23L is placed in a shield case 41 made of an Fe—Ni—Mo alloy or the like.
And 23R are stored. First core halves 23L and 2
3R is the same as that shown in FIG. 2 (A), in a state where it is held and fixed to a holder 22 made of a non-magnetic material,
And (b) are plane polished. A shield plate 24 is interposed between the two core halves 23L and 23R.

As shown in FIG. 8, the second core half 42L
And 42R are laminated cores in which thin plates of a magnetic material such as an Fe-Ni-Nb alloy are laminated, and the side surfaces are C-shaped (or U-shaped). This second core half 42
L and 42R are individually polished so that the joint surfaces (c) and (d) are the same surface, and the polished surfaces (c) and (d) (at least the polished surface (c)) are made of SiO ₂ or the like. Is sputtered to form a gap layer.
Also in this example, since the gap layer of the nonmagnetic material is formed on each of the core halves 42L and 42R, the number of processes in the film forming process can be increased.

The second core halves 42L and 42R are connected to the first core halves 23L and 42R by an elastic member 43 shown in FIG.
It is resiliently joined to 3R. The elastic member 43 is formed by bending a non-magnetic metal material (a leaf spring material). The resilient member 43 is provided with bent portions 43b and 43e at both ends and holding pieces 43a and 43d extending from the tip of each bent portion. As shown in FIG. 7, the first core halves 23L and 23R are assembled in the shield case 41.
Further, both side surfaces 42La and 42Ra (only 42La is shown in FIG. 8) of the gap junction between the second core halves 42L and 42R are sandwiched by the sandwiching pieces 43a and 43d.

Further, one second core half 42L is positioned between a protruding portion 43c formed on the middle abdomen of the connecting member 43 and the bent portion 43b, and the other second core half 42L is provided. The core half 42R is positioned between the similarly protruded projection 43f and the bent portion 43e. The connecting member 4
3 are formed by bending springs 43g and 43h.
3g and 43h are interposed between the second core half and the inner surface of the shield case 41, and both the second core halves 42L and 42R
Are pressed against the first core half by the springs 43g and 43h, and the joint surfaces (c) and (d) and the first core half 23L,
The joining surface (a) and (b) of 23R are joined. At the base of the connecting member 43, a positioning portion 43i is bent in a U-shape, and as shown in FIG.
i is fitted to the base end of the shield case 41.

In the embodiment shown in FIGS.
Function as a positioning member and a connecting member for positioning the second core halves 42L and 42R with each other, so that the two core halves 42L and 42R
Positioned securely within. Moreover, the second core half 42
Since L and 42R are individually resiliently pressed by springs 43g and 43h and are joined to the first core halves 23L and 23R, the first core halves 23L and 23R and the second core halves 25L and 25R is securely pressed and joined.

As shown in FIG. 7, the first core half 23L,
Bobbins 27L and 27R around which a coil 28 is wound are attached to the joint between the base ends of the 23R and the second core halves 42L and 42R, and each member is fixed in the shield case 41 with a resin material. Then, the tip of the shield case 41 is polished to form the sliding surface S. In the example of FIG. 7, the shield plate 24 is inserted between both the first core halves 23L and 23R and the second core halves 42L and 42R.

FIG. 9 is a sectional view of a magnetic head showing another configuration example of the present invention. FIGS. 10 and 11 show the second core half housed in the shield case in the magnetic head of FIG. It is a perspective view which shows the example of a structure of. In the configuration example shown in FIG. 9, the core half is positioned so as to directly hit the inner surface of the shield case 51. Therefore, a protective layer 51a made of a non-magnetic material is formed on the inner surface of the shield case 51. That is, the shield case 51 is formed by drawing a clad material in which a non-magnetic material is laminated on a magnetic material, or a material in which a non-magnetic material layer is formed on one surface of a magnetic material.

The first core halves 52L and 52R (only 52L is shown in FIG. 9) are I-shaped cores, and are positioned and installed on the inner surface of one side plate 51b of the shield case 51. The core halves 52L and 52R are connected to each other by a connecting member 33 as shown in FIG. 5, for example, and are positioned in the shield case 51 by a positioning protrusion (not shown) formed on the inner surface of the side plate 51b. It has become something.

As shown in FIGS. 10 and 11, the second core halves 42L and 42R are the same as those shown in FIGS. 7 and 8, and are C-shaped laminated cores. In the example shown in FIG. 10, a connecting member 53 of a sheet metal material is interposed between both core halves 42L and 42R. The connecting member 53 is bent in a substantially triangular shape by a sheet metal material, and the second core halves 42L and 42R are fixed to the outer surfaces of both side plates 53a and 53b of the connecting member 53 that have an angle to each other. ing. In FIG. 10, the connecting member 53 is formed of a material in which a non-magnetic material layer is formed on the outer surface of a magnetic material,
The connecting member 53 can be used as a magnetic shield member for the two core halves 42L and 42R.

In the example shown in FIG. 11, the second core half 42
A connecting member 54 interposed between L and 42R is a block of a resin material or a non-magnetic metal material, and the second core halves 42L and 42
R is joined. When the connecting member 54 is made of a non-magnetic material, a groove 54a for positioning the shield plate is formed in the connecting member 54, and a magnetic shield between the core halves 42L and 42R is formed by the shield plate provided in the groove 54a. Is performed. The connection member 54 can be used as a shield member by forming the connection member 54 mainly from a magnetic material and using only the nonmagnetic material layer at the joint with the core halves 42L and 42R.

The connecting body shown in FIGS. 10 and 11 and including the second core halves 42L and 42R and the connecting member 53 or 54 has a joint surface (c) and (d) in this connected state. The surface is polished so as to have the same surface, and a gap layer of a non-magnetic material is formed on the bonding surfaces (c) and (d) by sputtering. The connecting members 53 and 54 are connected to the core halves 42L and 42
Since it is a small one interposed only between R and the connector shown in FIGS. 10 and 11 is also small, the number of processes in one film forming step can be increased.

In FIGS. 10 and 11, the second core halves 42L and 42R are connected by connecting members 53 and 54. The connecting members 53 and 54 are integrally provided with a spring for suppressing pressure. Not formed. Therefore, as shown in FIG. 9, when incorporated in the shield case 51, a leaf spring 55 of a nonmagnetic material is installed on the inner surface of the side plate 51 c of the shield case 51, and the second core half is provided by the leaf spring 55. The bodies 42L and 42R are pressed against the first core halves 52L and 52R. The connection of the core halves 42L and 42R and the connection member 53 or 54 shown in FIG. 10 or 11 is used for the magnetic head having the configuration shown in FIG. It can also be held and pressure-bonded to the C-shaped first core halves 23L and 23R.

[0066]

[0067]

[0068]

[0069]

As described above, according to the present invention, the second core halves are individually pressed by the springs and joined to the first core halves, and the plurality of second core halves are connected to each other. In a state where the two core halves are connected to the first core half by being pressed by a spring and joined to the first core half, the second core half is held in comparison with the conventional case where both core halves are held by the holder. The core half is first
And the gap length can be made more accurate. Further, since the conventional holder for holding and fixing the second core half is not required, the number of parts can be reduced.

Further, by forming a gap layer by forming a non-magnetic material on the joint portion of the second core half, the gap length can be set with higher accuracy, and the output between the channels can be improved. There is no need to adjust the difference. Also,
Since the gap layers are individually formed on the second core halves or are formed in a state of being connected by the connecting member, the number of processing of the core halves in the film forming process can be increased.

[Brief description of the drawings]

FIG. 1 shows a magnetic head of the present invention, wherein (A)
Is a cross-sectional view in a plane along the running direction of the magnetic tape, (B)
Is a cross-sectional view taken along line BB of FIG.

2A is an exploded perspective view showing an assembly of a first core half and a holder shown in FIG. 1, FIG. 2B is an exploded perspective view showing a second core half and a pressing member,

FIG. 3 is a perspective view showing a state in which a second core half is held by a holding portion of a connecting member;

FIG. 4 is a perspective view showing a state in which a second core half is connected by fitting with a connecting member;

FIG. 5 is a perspective view showing a state in which the second core halves are connected by a sheet metal connecting member;

FIG. 6 is a perspective view showing a manufacturing process of the second core half and the connecting member.

FIG. 7 is a sectional view showing a magnetic head having another configuration example.

8 is a perspective view showing a second core half and a resilient member housed in a shield case of the magnetic head shown in FIG. 7;

FIG. 9 is a sectional view showing a magnetic head of still another configuration example;

10 is a perspective view of a second core half and a connecting member housed in the magnetic head shown in FIG. 9;

FIG. 11 is a perspective view of a second core half housed in the magnetic head shown in FIG. 9 and a connecting member having another structure;

FIG. 12 is a sectional view showing a conventional magnetic head.

[Explanation of symbols]

 Reference Signs List 21 shield case 22 holder 23L, 23R first core half 24 shield plate 25L, 25R second core half 26 resilient member 26a spring 27L, 27R bobbin 28 coil 31 connecting member 31a spring 31b, 31c holding member 32 connecting member 32a spring 33 connecting member 34 connecting member 42L, 42R second core half 43 resilient member 43g, 43h spring 53 connecting member 54 connecting member 61 connecting member 61a, 61b positioning protrusion 63 holder 63a, 63b positioning recess

Claims (8)

(57) [Claims] 1. A first core half paired with each other and a second core halves, a plurality of sets stored in the case, the surface of the case, appear bonding gap each pair of core halves In the magnetic head, the first core halves are respectively positioned and installed in the case, and the plurality of second core halves are
A second core half connected to each other by a connecting member;
And the connecting member for connecting the same is housed in a case.
Wherein the connecting member is formed of a leaf spring material;
By the spring formed integrally with the connecting member, the second connector is formed.
The first half is directly pressed and joined to the first core half by pressure.
A magnetic head, characterized in that are. 2. The connecting member has a second core half.
A plurality of springs corresponding to each are integrally formed.
Each said spring separates the individual second core halves individually
2. The magnetic head according to claim 1, wherein the magnetic head is repressed . 3. A pair of first core halves and second core halves.
A plurality of core halves are stored in a case, and the case
Surface, the junction gap of each pair of core halves appears
In the magnetic head, the first core halves each have a case.
Is positioned and installed within the plurality of second core halves
A second core half connected to each other by a connecting member;
And the connecting member for connecting the same is housed in a case.
And the connecting member is provided between a plurality of second core halves.
A magnetic material layer that magnetically shields
Bonded to each second core half via a non-magnetic material layer
And the second housing is provided by a spring housed in the case.
Core half is pressed directly to the first core half
A magnetic head characterized in that: 4. A first pair of core halves and a second pair of
A plurality of core halves are stored in a case, and the case
Surface, the junction gap of each pair of core halves appears
In the magnetic head, the first core halves each have a case.
Is positioned and installed within the plurality of second core halves
A second core half connected to each other by a connecting member;
And the connecting member for connecting the same is housed in a case.
The connecting member is formed by bending a plate material.
Which is sandwiched between the second core halves.
Individual second core halves on the angled surfaces of the connecting members of
The body is joined and the spring stored in the case
The first core half and the second core half is directly repression
A magnetic head characterized by being joined by pressure . 5. A plurality of said second core halves, respectively.
4. The spring is individually repressed by said spring of
4. The magnetic head according to item 4 . 6. Each of the plurality of second core halves includes a front half.
Claim 1 or Claim 2 which is positioned by said connecting member.
6. The magnetic head according to any one of 5 . 7. A first core is C-shaped core, the magnetic head according to any one of claims 1 to 6 the second core is an I-type core. 8. The bonding surface of the first core half body in the second core half body, the magnetic head according to any one of claims 1 to 7 gap layer of a nonmagnetic material is deposited .