JPH0710807U - Magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a magnetic head having a structure in which the tip gap portion is not displaced. [Structure] Between the tip gap portions 2b of the core segments 2L and 2R of the plurality of laminated cores 2 ₁ and 2 _{2 which} are divided into two substantially equal sizes and between the adjacent laminated cores 2 ₁ and 2 ₂ . In a magnetic head that concentrates the tip of the interposed shield plate 5 toward the opening 1a of the case 1, a gap portion hole 7c into which the tip gap portions 2b of the core segments 2L and 2R and the tip of the shield plate 5 can be inserted. By fitting the flanged resin cap 7 formed with the above into the tip gap portion 2b, and inserting the opening projection 7a projected from the resin cap 7 into the opening 1a of the case 1, A magnetic head in which the tip gap portion 2b is positioned.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a magnetic head used for a magnetic tape, and more particularly to the internal structure of the magnetic head.

[0002]

[Prior art]

 As is well known, for example, a magnetic head used for a magnetic tape such as an audio tape usually has a built-in laminated core made of, for example, perlomy metal.

FIG. 4 shows a two-channel magnetic head for a magnetic tape, and inside the diaphragm processing case 1 A of the magnetic head, two laminated cores 2 ₁ for each channel shown in FIGS. 5 and 6 are provided. Although 2 ₂ is built in, it is necessary to attach the coil unit 3 A having an outer dimension larger than the thickness of the laminated cores 2 ₁ and 2 _{2 to} the winding portions 2 a of these laminated cores 2 ₁ and 2 ₂ . Therefore, as shown in FIG. 6, each of the conventional laminated cores 2 ₁ and 2 ₂ is divided into _two left and right core segments 2L and 2R divided from the gap, and these core segments 2L and 2R are divided into die-cast molding holders 4L. , 4R are respectively located in the core mounting grooves 4a, 4b on the inner side surfaces of the molding holders 4L, 4R so that the tip gap portions 2b of the laminated cores 2 ₁ , 2 ₂ are made to correspond to the openings 1a of the case 1A. Focus on the opening 4c.

When mounting the core segments 2L and 2R to the molding holders 4L and 4R, the molding cores 4L and 4R are magnetically separated from the laminated cores 2 ₁ and 2 _{2 of} each channel. The two-divided shield plates 5L and 5R are positioned in the shield plate mounting groove 4d on the inner surface. Next, while fitting the bobbin 3a of the coil unit 3A into the winding portions 2a of the core segments 2L and 2R placed in the opposed state, the core segments 2L and 2R and the shield plates 5L and 5R are supported left and right. Butt the molding holders 4L and 4R in the left-right direction. While maintaining the abutting state, both the molding holders 4L and 4R are inserted into the case 1A so that the front end gap portions 2b of the laminated cores 2 ₁ and 2 ₂ are projected from the opening 1a of the case 1A.

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

[0006]

[Problems to be solved by the device]

 However, the assembling accuracy of the conventional magnetic head structure as described above 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 matching relationship between the holders 4L and 4R, as shown in FIG. 7, the left and right tip gap portions 2b are displaced in the vertical direction, the product value is impaired, and the expected magnetic characteristics are obtained. In many cases, it was troublesome to manage for fine adjustment of position and improvement of yield. In view of the problems of the conventional magnetic head as described above, an object of the present invention is to obtain a magnetic head having a structure in which the tip gap portion is not displaced.

[0007]

[Means for Solving the Problems]

 In order to achieve this object, the present invention provides a tip plate gap portion of each core segment of a plurality of laminated cores divided into two substantially equal sizes and a shield plate interposed between the adjacent laminated cores. In a magnetic head that concentrates the tip end toward the opening of the case, a resin cap with a collar having a gap portion hole into which the tip gap portion of the core segment and the tip of the shield plate can be inserted is formed into the tip gap portion. It is proposed that the tip end gap portion is positioned with respect to the opening by inserting the opening protrusion projected from the resin cap into the opening of the case.

[0008]

[Embodiment] Hereinafter, the embodiment of the present invention will be described in detail with reference to FIGS. The illustrated embodiment is an example in which the present invention is applied to a two-channel magnetic head for a magnetic tape. Also in this magnetic head, the laminated cores 2 ₁ and 2 ₂ made of perlomy metal or the like are used as in the conventional case. .

That is, as shown in FIG. 1, the laminated cores 2 ₁ and 2 ₂ of each channel, which are made to have the same width L as the shield plate 5 which will be described in detail later, are bisected into equal-sized and equal shapes from the position of the gap. The left and right core segments 2L and 2R are formed, and these core segments 2L and 2R are fixed to the front surface and the back surface of one shield plate 5 in a laminated 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 material layers are laminated on the front surface and the back surface, but these non-magnetic material layers are different from the shield plate 5. It may be composed of a non-magnetic plate.

As can be seen from FIG. 2, each of the core segments 2L and 2R is composed of a first segment S ₁ and a second segment S ₂ having a substantially equal thickness, and the first segment S ₁ Is composed of a tip gap portion 2b, a side portion 2c, and a winding portion 2a, which are continuously formed in a substantially "U" shape. The second segment S ₂ facing the shield plate 5 is a tip gap portion. 2b and the side portion 2c only. Therefore, the gaps H ₁ and H ₂ shown in FIG. 1 are formed between the winding portion 2a of the first segment S ₁ and the front surface or the back surface of the shield plate 5, so that the first segment S ₁ When the bobbin 3a of the coil unit 3 is fitted in the winding portion 2a, the bobbin 3a on the side facing the shield plate 5 and the corresponding portion of the winding 3c are positioned in the space of the gaps H ₁ and H _2. Even when the coil unit 3 is attached to the winding portion 2a, the core segments 2L and 2R of each channel can be fixed to both surfaces of the shield plate 5 in a laminated state.

When assembling the core segments 2L, 2R and the shield plate 5 with respect to the case 1, a resin cap 7 molded of non-magnetic hard resin such as epoxy resin is attached to the tip gap portions 2b of the core segments 2L, 2R. Further, the laminated body (assembled body) of the core segments 2L and 2R 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. 1, the resin cap 7 has an opening projection 7a corresponding to the opening 1a of the case 1 and a collar 7b which can be applied to the inner surface of the case 1, and the opening projection 7a A gap portion hole 7c having a sectional shape corresponding to the tip gap portion 2b of the core segments 2L and 2R is formed inside.

The holding spring 8 shown in FIG. 1 is formed by bending a single plate material, and includes a pair of forwardly extending members that can be pressed against both side surfaces of the assembled laminated cores 2 ₁ and 2 ₂ . It has a holding arm 8a and elastic legs 8b which can elastically contact the inner surface of the case and hold the core segments 2L, 2R and the shield plate 5 in the state shown in FIGS. Reference numeral "6" in FIGS. 2 and 3 is 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 process. First, the core segments 2L and 2R of each channel in which the coil unit 3 is fitted to the winding portion 2a are laminated and fixed on the front surface and the back surface of the shield plate 5 with an adhesive, respectively. A resin cap 7 is capped on the tip gap portions 2b of the core segments 2L and 2R. Therefore, in this laminating process, by laminating the core segments 2L and 2R on one shield plate 5 and positioning the leading end gap portion 2b by the resin cap 7, important positions of the leading end gap portion 2b and the shield plate 5 are determined. Will be specified.

Next, the assembled core segments 2L and 2R and the shield plate 5 are held by a holding spring 8 and inserted into the case 1 from the back side, and the opening 1a of the case 1 is provided with an opening projection of the resin cap 7. When 7a is inserted, the elastic leg portion of the holding spring 8 elastically contacts the inner surface of the case 1, so that the assembly including the shield plate 5 and the core segments 2L and 2R is held in the state shown in FIGS. 2 and 3. Therefore, the filling resin is injected into the case 1 to be solidified. After that, in the process 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 projections 7a of the resin cap 7 are scraped off and the tip gap portion is opened from the opening 1a of the case 1. A part of 2b is exposed to the outside, and the magnetic head is completed.

Although the 2-channel magnetic head has been illustrated in the above-mentioned conventional description and the above-mentioned embodiment, the present invention can also be applied to a 4-channel magnetic head. Further, although the magnetic head not using the molding holder has been described in the above embodiment, the present invention can be applied to the magnetic head using the molding holder. However, it is needless to point out again that even if a molded holder is used, better results can be obtained by using one shield plate than by using a two-divided shield plate.

[0016]

[Effect of device]

 As is clear from the above description, in the present invention, the resin caps are fitted in the tip gap portions of the plurality of laminated cores, and the opening projections of the resin caps are inserted into the opening of the case. The relationship with the tip gap of the laminated core of the channel is specified, and the relationship between the tip gap and the opening of the case is also stabilized, eliminating the positional deviation between the left and right core segments and improving the product yield. Further, in the structure in which the core segment of each channel is laminated on one shield plate as in the above-mentioned embodiment, the molding holder can be eliminated, and the number of parts can be reduced and the assembly line of the magnetic head can be automated. effective.

[Brief description of 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 magnetic head shown in FIG. 5 with a filling resin removed.

3 is a sectional view taken along line 3-3 of FIG.

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

5 is a sectional view taken along line 5-5 of FIG.

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]

1 Case 1a Opening 2 ₁ , 2 ₂ Laminated core 2L, 2R Core segment 2b Tip gap part 5 Shield plate 7 Resin cap 7a Opening protrusion 7b Collar 7c Gap hole

Claims (1)

[Scope of utility model registration request] 1. An opening of a case is defined by a tip gap portion of each core segment of a plurality of laminated cores divided into two substantially equal and equal shapes and a tip of a shield plate interposed between the adjacent laminated cores. In the magnetic head that concentrates toward
A resin cap with a collar having a gap hole into which the tip gap portion of the core segment and the tip of the shield plate can be inserted is fitted into the tip gap portion, and an opening projection projected from the resin cap is provided on the case. A magnetic head characterized in that the tip gap portion is positioned with respect to the opening by being inserted into the opening.