JPH08251U - Composite type magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] The present invention provides a composite magnetic head in which the magnetic tape is prevented from directly contacting the magnetic ferrite of the core half to eliminate sliding noise to the magnetic ferrite. The purpose is to provide. [Structure] A core half body 11 composed of a pair of magnetic ferrites,
By abutting 12 together, the gap 17
In the composite magnetic head 10 configured so as to define the above, the upper surface regions 11a and 12a of the core halves 11 and 12 to which the magnetic tapes are abutted are formed by a non-magnetic material, The composite type magnetic head 10 is configured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to, for example, a VTR device for high density recording and a magnetic head of a digital audio tape recorder.

[0002]

[Prior art]

 Conventionally, such a magnetic head is constructed as shown in FIG. 3, for example. In FIG. 3, the magnetic head 1 is composed of a pair of core halves 2 and 3 made of magnetic ferrite. The core halves 2 and 3 have abutting surfaces 4 and 5, respectively. Gap forming portions 4a and 5a and rear joint portions 4b and 5b are formed.

Further, the abutting surfaces 4 and 5 of the core halves 2 and 3 are coated with metal magnetic thin films 6 and 7 which are ferromagnetic materials such as Fe, Al and Si, respectively. As a result, the gap portion 8 including the metal magnetic films 6 and 7 can be configured when they are joined to each other in a butt state.

Further, one core half body 2 is provided with a groove portion 4c on the side of the abutting surface 4 on which a winding is to be wound, and this groove portion 4c is joined to the other core half body 3. Sometimes, by defining the winding window 9, a coil winding (not shown) can be wound around the groove 4c of the core half 2 through the winding window 9.

According to the magnetic head 1 configured as described above, the gap portion 8 defined by the gap forming portions 4 a and 5 a of the core halves 2 and 3 has the magnetic thin film 6 having a relatively high saturation magnetic flux density. , 7 can be adapted to a high coercive force medium.

Therefore, a magnetic tape (not shown) slides along the curved upper surfaces of the cores 2 and 3 of the magnetic head 1 so that magnetic recording is performed on the magnetic tape. The data and so on can be converted into an electric signal by the coil winding and can be reproduced.

[0007]

[Problems to be solved by the device]

 However, in reproducing the data recorded on the magnetic tape in the magnetic head 1 configured as described above, the magnetic tape slides along the upper surfaces of the core halves 2 and 3 of the magnetic head 1. As a result, friction occurs on the upper surfaces of the core halves 2 and 3.

Therefore, when the magnetic tape slides on the magnetic ferrite that constitutes the core halves 2 and 3, sliding noise is generated, which causes C / C in the high frequency region. There is a problem that the N ratio (carrier / noise ratio) is lowered and it becomes difficult to reproduce a wide band.

Further, the magnetic tape comes into contact with the surfaces of the magnetic thin films 6 and 7 made of a ferromagnetic alloy in the area of the gap portion 8, and the core half made of magnetic ferrite in the other areas. Since it comes into contact with the second and third parts, uneven strength is caused due to the difference in strength, and there is also a problem that the magnetic tape cannot reliably come into contact with the surfaces of the core halves 2 and 3.

In view of the above points, the present invention provides a composite magnetic head in which the magnetic tape is prevented from directly contacting the magnetic ferrite of the core half to eliminate sliding noise with respect to the magnetic ferrite. It is intended to be provided.

[0011]

[Means for Solving the Problems]

 According to the present invention, the above object is to provide, in a composite magnetic head, configured so that a pair of magnetic ferrite core halves are butted against each other to define a gap portion. This is achieved by a composite type magnetic head characterized in that the surface area of the magnetic tape of (1) is made of a non-magnetic material.

[0012]

[Action]

 According to the above configuration, since the surface of the core half to which the magnetic tape is to be contacted is covered with the non-magnetic material, the magnetic tape does not directly contact the surface of the core half and Since they come into contact with each other via the magnetic body, they do not come into contact with the magnetic ferrite that constitutes the core half body, so that sliding friction does not occur with respect to the magnetic ferrite, and therefore sliding noise can be eliminated. become.

[0013]

【Example】

 Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings. FIG. 1 shows an embodiment of a magnetic head according to the present invention.

The magnetic head 10 is composed of a pair of core halves 11 and 12 made of magnetic ferrite. The abutting surfaces 13 and 14 of the core halves 11 and 12 have gap forming portions 13 a, respectively. , 14a and rear joints 13b, 14b are formed.

Further, the abutting surfaces 13 and 14 of the core halves 11 and 12 are formed with metal magnetic thin films 15 and 16 which are ferromagnetic materials such as Fe—Al—Si alloys on the surfaces thereof. By doing so, the gap portion 17 including the metal magnetic films 15 and 16 can be formed when they are joined in a butt state.

Further, one core half body 11 is provided with a groove portion 13c on the side of the abutting surface 13 on which the winding is wound, and this groove portion 13c is joined to the other core half body 12. At this time, the winding window 18 is defined so that a coil winding (not shown) can be wound around the groove 13c of the core half 11 through the winding window 18. .

The above-mentioned configuration is similar to that of the conventional magnetic head 1 shown in FIG. 2, but in the magnetic head 10 according to the present invention, the core halves 11 and 12 have magnetic tapes of The upper surface regions 11a and 12a to be brought into contact with each other are configured as a so-called composite substrate made of non-magnetic material such as non-magnetic ferrite, weak magnetic ferrite, glass ceramic or the like, instead of magnetic ferrite.

Here, the magnetic head 10 is manufactured as shown in FIG. That is, as shown in FIG. 2A, the substrate 20 is formed by joining a magnetic substrate 21 made of ferrite and a non-magnetic substrate 22 made of non-magnetic ferrite with a glass material (not shown). Composed. Thereafter, as shown in FIG. 2 (B), the substrate 20 has track grooves 23 and reinforcing grooves 24 formed along the joint portion, and the upper joint surface 20a in the drawing is polished, and then the joint A magnetic thin film 25 is formed on the surface 20a (see FIG. 2C), and subsequently, the track glass 23 and the reinforcing groove 24 are filled with the bonding glass 26, and then the bonding surface 20a is polished again. (See FIG. 2D).

After that, a winding groove 27 is formed on the bonding surface 20a of the substrate 20 and the lower surface facing the bonding surface 20a (see FIG. 2E), and SiO2 or the like is applied to the remaining area of the bonding surface 20a. The gap member 28 is formed, and as shown in FIG. 2F, a core half block 29 in which a plurality of core halves are lined up integrally is completed.

As shown in FIG. 2G, the two core half blocks 29 formed in this way are joined so that their joint surfaces 20 a face each other, and the track grooves 23 are exposed. The tape sliding surface 20b is polished into a cylindrical shape as shown in FIG. 2 (H) and then sliced along the longitudinal direction as shown by the dotted line in FIG. 2 (I). The individual magnetic heads 10 are completed (see FIG. 2 (J)).

The magnetic head 10 according to the present invention is configured as described above, and the gap portion 17 defined by the gap forming portions 13a and 14a of the core halves 11 and 12 has a relatively high saturation magnetic flux density. Due to the presence of the magnetic thin films 15 and 16 having the above, it can be adapted to a high coercive force medium.

As a result, the magnetic tape (not shown) slides along the curved surfaces of the cores 11 and 12 of the magnetic head 10 as a whole, so that the magnetic tape is exposed. The magnetically recorded data or the like can be converted into an electric signal by the coil winding and can be reproduced.

Further, according to the present magnetic head 10, since the surface regions 11a 1 and 12a of the core halves 11 and 12 are made of the non-magnetic material, the surface to which the magnetic tape is abutted is Since the magnetic tape is covered with the non-magnetic material, the magnetic tape does not directly contact the surfaces of the core halves 11 and 12 but the non-magnetic material.

Therefore, the magnetic tape does not directly contact the magnetic ferrite forming the core halves 11 and 12 and does not slide, so that sliding friction does not occur with respect to the magnetic ferrite and the magnetic tape slides. The noise could be eliminated.

Thus, the C / N ratio in the high frequency band can be improved, and wide band reproduction is possible.

At this time, if a material having the same degree of abrasion resistance as the magnetic thin films 15 and 16 is selected as the non-magnetic material, the magnetic thin films 15 and 16 and the upper surfaces of the core halves 11 and 12 are selected. However, the sliding of the magnetic tape does not cause uneven wear, so that a stable contact state of the magnetic tape can be maintained.

[0027]

[Effect of device]

 As described above, according to the present invention, the magnetic tape is prevented from directly contacting the magnetic ferrite of the core half body to eliminate sliding noise to the magnetic ferrite, which is an extremely excellent composite magnetic type. A head could be provided.

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a magnetic head according to the present invention.

2A to 2C are process diagrams sequentially showing a manufacturing process of the magnetic head of FIG.

FIG. 3 is a schematic perspective view showing an example of a conventional magnetic head.

[Explanation of symbols]

 10 magnetic head 11 and 12 core half body 11a and 12a surface area 13 and 14 abutting surface 13a and 14a gap forming part 13b and 14b rear joining part 13c groove part 15 and 16, 25 magnetic thin film 17 gap part 18 winding window 20 substrate 21 Magnetic substrate 22 Non-magnetic substrate 23 Track groove 24 Reinforcing groove 26 Glass for bonding 27 Winding groove 28 Gap material 29 Core half block

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[Procedure amendment]

[Submission date] October 31, 1994

[Procedure Amendment 1]

[Document name to be corrected] Drawing

[Correction target item name] All drawings

[Correction method] Change

[Correction content]

FIG.

[Fig. 2]

[Figure 4]

[Figure 3]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Brief description of the drawing

[Correction method] Change

[Correction content]

[Brief description of drawings]

FIG. 1 is a schematic perspective view showing an embodiment of a magnetic head according to the present invention.

2A to 2C are process diagrams sequentially showing a manufacturing process of the magnetic head of FIG.

3A to 3C are process diagrams sequentially showing a manufacturing process of the magnetic head of FIG.

FIG. 4 is a schematic perspective view showing an example of a conventional magnetic head.

[Explanation of Codes] 10 Magnetic Head 11, 12 Core Half 11a, 12a Surface Area 13, 14 Butt Face 13a, 14a Gap Forming Section 13b, 14b Rear Joining Section 13c Groove 15, 16, 25 Magnetic Thin Film 17 Gap 18 Roll Wire window 20 Substrate 21 Magnetic substrate 22 Non-magnetic substrate 23 Track groove 24 Reinforcing groove 26 Bonding glass 27 Winding groove 28 Gap material 29 Core half block

Claims (1)

[Scope of utility model registration request] 1. In a composite magnetic head constructed so as to define a gap portion by abutting a pair of core halves made of magnetic ferrite, the magnetic tapes of the core halves are brought into contact with each other. The surface region to be formed is characterized by being formed of a non-magnetic material,
Composite magnetic head.