JP2598399Y2 - Magnetic head - 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 used for a magnetic tape, and more particularly to an internal structure of the magnetic head.

[0002]

2. Description of the Related Art As is well known, in a magnetic head used for a magnetic tape such as an audio tape, for example, a laminated core such as a permalloy metal is usually incorporated.

FIG. 4 shows a two-channel magnetic head for a magnetic tape, and two laminated cores 2 ₁ , 2 ₂ for each channel shown in FIGS. 5 and 6 are provided inside a drawing case 1A of the magnetic head. Although there are built, these laminated core 2 _1, the 2 _second winding portion 2a need to attach each large coil units 3A external dimensions than the thickness of the laminated core 2 _1, 2 _2. For this reason, as shown in FIG. 6, each of the conventional laminated cores 2 ₁ and 2 ₂ is divided into _two as left and right core segments 2 L and 2 R divided from a gap.
L, the core mounting groove 4a of the inner side surface of the 4R, by positioning each 4b, and the laminated core 2 _1, 2 ₂ of the tip gap portion 2b, forming holder 4L made to correspond to the opening 1a of the case 1A, the 4R Focus on the opening 4c.

[0004] Then, the forming holder 4L, each against 4R core segment 2L, when mounting the 2R, for magnetic isolation between the laminated core 2 _1, 2 ₂ of each channel shaped holder 4L, 4R inner surface of 2D shield plates 5L and 5R are positioned in the shield plate mounting groove 4d. Next, the winding portions 2a of the core segments 2L, 2R placed in the facing state
The core segments 2L, 2R and the shield plates 5L, 5R are fitted to the bobbin 3a of the coil unit 3A.
The left and right forming holders 4L and 4R supporting the R are abutted in the left and right direction. While maintaining the same butted state, the two molding holders 4L and 4R are inserted into the case 1A and the case 1
Laminate A to the opening 1a core 2 _1, 2 ₂ of the tip gap 2
b is projected.

After that, by filling the inside of the case 1A with an insulating resin, the positional relationship between the laminated cores 2 ₁ and ₂ and the shield plates 5L and 5R is fixed, and the tip protruding from the opening 1a of the case 1A. The tip of the gap 2b is polished, and the external connection terminal 3b of the coil unit 3A is soldered to the terminal plate 6A to complete the magnetic head.

[0006]

However, in the conventional magnetic head structure as described above, the matching relationship between the plurality of core segments 2L, 2R and the shield plates 5L, 5R is obtained by using the pair of forming holders 4L, 4R. Therefore, not only does the number of parts increase, but also the above-described molding holder 4L,
The process of assembling the core segments 2L and 2R and the shield plates 5L and 5R with respect to the 4R is a rather cumbersome process, and is often performed manually, which has a problem that the mass production effect is hardly exhibited. The assembling accuracy of the magnetic head is determined by the processing accuracy and the assembling accuracy of the case 1A and the forming holders 4L and 4R.
If there is an error in the processing accuracy of the 4R or the matching relationship between the two forming holders 4L and 4R, the left and right tip gap portions 2b are displaced in the vertical direction, as shown in FIG. In many cases, characteristic characteristics cannot be obtained, and management for delicate position adjustment and improvement in yield is troublesome. An object of the present invention is to provide a magnetic head having a structure in which the number of parts is small, the assembling process can be automated, and no misalignment occurs in the tip gap, in view of the problems of the conventional magnetic head described above. is there.

[0007]

According to the present invention, a coil unit is fitted to a winding portion of a plurality of laminated cores, and a shield plate is interposed between adjacent laminated cores. In a magnetic head that magnetically separates cores, each core segment of a laminated core divided into two substantially equal-sized shapes is divided into a first segment having a tip gap portion, a side portion, and a winding portion, and a tip gap portion. And a second segment having only a side portion, and laminated, a coil unit is fitted to the winding portion of the first segment, and the second segment faces both sides of the shield plate with the second segment facing the shield plate. A magnetic head in which laminated cores are laminated and fixed is proposed.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of the present invention; FIG. The illustrated embodiment is an example in which the present invention is applied to a two-channel magnetic head for a magnetic tape. In this magnetic head, the laminated cores 2 ₁ , 2 ₂ made of Perlomy metal or the like are also used.
Is used as in the prior art.

That is, as shown in FIG. 1, the laminated cores 2 ₁ , 2 ₂ of each channel formed to have the same width L as the shield plate 5 described in detail later are divided into two equal-sized shapes from the gap position. The core segments 2L and 2R are fixed to the front and back surfaces of the single shield plate 5 in a stacked state prior to assembly with the case 1. Although not shown, the shield plate 5 made of a magnetic material has a clad structure in which non-magnetic layers are laminated on the front and back surfaces, but these non-magnetic layers are separate from the shield plate 5. It may be constituted by a nonmagnetic plate.

As can be understood from FIG. 2, each of the core segments 2L and 2R comprises a first segment S ₁ and a second segment S ₂ having substantially the same thickness, and the first segment S ₁ is substantially It is composed of a tip gap portion 2b, a side portion 2c, and a winding portion 2a which are continuously formed in a "U" shape.
Said second segment S ₂ facing the shield plate 5, it is constituted from only the tip gap portion 2b and the side edge portions 2c.
Accordingly, between the front or back of the first segment S ₁ of the winding portion 2a and the shield plate 5, the gap shown in FIG. 1 H
_1, since H ₂ is formed, the corresponding portion of the first segment when fitting the bobbin 3a of the coil unit 3 to the winding portion 2a of S _1, on the side facing the shield plate 5 bobbin 3a and the winding 3c Since the coil unit 3 is located in the space between the gaps H ₁ and H ₂ , even when the coil unit 3 is attached to the winding portion 2 a, the core segments 2 of each channel are provided on both surfaces of the shield plate 5.
L and 2R can be fixed in a laminated state.

[0011] Core segment 2L, 2 for case 1
When assembling the R and the shield plate 5, a resin cap 7 molded of a nonmagnetic hard resin such as an epoxy resin is mounted on the tip gap portion 2b of the core segments 2L and 2R.
A laminate (assembly) of the core segments 2 </ b> L, 2 </ b> R and the shield plate 5 is inserted into the case 1 while being held by the holding spring 8. That is, as shown in FIG.
The resin cap 7 has an opening protrusion 7a corresponding to the opening 1a of the case 1 and a flange 7b that can be applied to the inner surface of the case 1, and the core segments 2L, 2R are provided inside the opening protrusion 7a. A gap portion hole 7c having a sectional shape corresponding to the tip gap portion 2b is formed.

[0012] The holding spring 8 shown in Figure 1, intended to be bent out of a plate material, a pair of extending forwardly capable pressed against the both side surfaces of the laminated core 2 _1, 2 ₂ assembled A holding arm 8a and an elastic leg 8b capable of elastically contacting the inner surface of the case and holding the core segments 2L, 2R and the shield plate 5 in the state shown in FIGS. 2 and 3 are provided. Reference numeral “6” in FIGS. 2 and 3 denotes a terminal plate for mounting the external connection terminal 3b of the coil unit 3.

Since the magnetic head according to the illustrated embodiment has the above-described structure, it can be assembled in the following steps. First, the core segments 2L and 2R of each channel in which the coil unit 3 is fitted to the winding portion 2a are respectively laminated and fixed on the front surface and the rear surface of the shield plate 5 by using an adhesive. Core segment 2
A resin cap 7 is mounted on the front end gap 2b of the left and right sides 2R. Therefore, in this laminating step, the lamination of the core segments 2L and 2R with respect to one shield plate 5 and the positioning of the tip gap 2b by the resin cap 7 allow
The important position between the tip gap portion 2b and the shield plate 5 is specified.

Next, the assembled core segments 2L,
The 2R and the shield plate 5 are held by the holding spring 8 and inserted into the case 1 from the back side. When the opening protrusion 7a of the resin cap 7 is inserted into the opening 1a of the case 1, the elastic leg of the holding spring 8 is Due to the elastic contact with the inner surface of the case 1, the shield plate 5 and the core segments 2L, 2R
2 and 3 are held in the state shown in FIGS. 2 and 3, the filling resin is injected into the case 1 and solidified.
Thereafter, in the step of soldering the terminal plate 6 to the back side of the case 1 and grinding the entire surface of the case 1, the opening protrusions 7 a of the resin cap 7 are scraped off, and the tip gap portion is removed from the opening 1 a of the case 1. A part of 2b is exposed to the outside, and the magnetic head is completed.

In the above description of the related art and the above embodiment, a two-channel magnetic head is exemplified. However, the present invention can be applied to a four-channel magnetic head. In this case, a two-channel magnetic head is prepared by preparing two assemblies as shown in FIG. 1 and using a shield plate or the like to assemble them inside the case while magnetically isolating these assemblies. Can be manufactured.

[0016]

As is clear from the above description, in the present invention, each core segment is composed of the first segment and the second segment, and the coil unit is fitted to the winding portion of the first segment, and the core segment and the core segment are connected to each other. Since the shield plate and the shield plate are laminated, it is possible to assemble an automatic assembly line without using a precision-formed forming holder. Therefore, according to the present invention, it is possible to reduce the product cost by reducing the number of parts by reducing the number of molding holders and by effecting mass production by automatic assembly. Further, according to the present invention, since the core segments of the laminated core are laminated on both surfaces of one shield plate, the displacement of the leading end gap portion as described with reference to FIG. 7 does not occur, thereby improving the product yield. There is.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a main part of a magnetic head according to the present invention.

FIG. 2 is a sectional view of the same magnetic head shown in FIG.

FIG. 3 is a sectional view taken along line 3-3 in FIG. 2;

FIG. 4 is a partially cutaway overall perspective view of a conventional magnetic head.

FIG. 5 is a sectional view taken along line 5-5 in FIG. 4;

FIG. 6 is an exploded perspective view of the magnetic head.

FIG. 7 is a front view of the assembled magnetic head.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Case 1a Opening 2 ₁ , 2 ₂ Laminated core 2L, 2R Core segment 2a Winding part 2b Tip gap part 2c Side part 3 Coil unit 5 Shield plate S ₁ 1st segment S ₂ 2nd segment

Claims (1)

(57) [Scope of request for utility model registration] 1. A magnetic head in which a coil unit is fitted to a winding portion of a plurality of laminated cores and a shield plate is interposed between adjacent laminated cores to magnetically isolate the laminated cores from each other. Each core segment of the laminated core divided into two equal parts is divided into a first segment having a tip gap portion, a side portion, and a winding portion, and a second segment having only the tip gap portion and a side portion, and laminated. A magnetic head wherein a coil unit is fitted to the winding portion of a first segment, and a laminated core is laminated and fixed on both surfaces of the shield plate in a state where the second segment faces the shield plate.