JP3191079B2 - Magnetic head - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic head, and more particularly, to a magnetic head mounted on a magnetic card reader or the like.

[0002]

2. Description of the Related Art Conventionally, a magnetic head shown in FIG. 5 has been used for a magnetic card reader or the like. As shown in FIG. 5, a conventional magnetic head 50 has a pair of substantially rectangular pillar-shaped holding frames 51,
An outer shell is formed by 52. This magnetic head 5
0 is formed in a cylindrical shape, and two windows 54 and 55 are formed side by side in the width direction around the butting portion of the holding frames 51 and 52 in the upper surface 53. A pair of magnetic cores (hereinafter, referred to as first and second auxiliary cores) 58, 61 and a pair of read magnetic cores (hereinafter, referred to as first and second auxiliary cores) forming magnetic gaps 56, 57 in the windows 54, 55, respectively. 59, 6).
2 are arranged and polished so as to have the same shape as the cylindrical surfaces of the holding frames 2 and 3. Further, a plurality of holes 6 are provided on both sides in the longitudinal direction of the lower portion of the magnetic head 50.
3 are provided, respectively.

FIG. 6 is an exploded perspective view showing a method of manufacturing the magnetic head shown in FIG. As shown in FIG. 5, the magnetic head includes first and second auxiliary cores 58, on which two auxiliary coils (referred to as first and second auxiliary windings) 66, 67 are provided.
61 and first and second lead cores 59 and 62 provided with two lead coils (hereinafter, referred to as first and second lead windings) 68 and 69, respectively, by two gap members 71 and 7.
2 and the magnetic gap 5
6, 57 and the butted first auxiliary core 58
The first lead core 59, the second auxiliary core 61, and the second lead core 62 are inserted into the windows 54, 55 of the holding frames 51, 52, respectively, and the remaining portion is held by the holding frame 5.
After being accommodated in the molds 1 and 52 and filled with a mold resin, the upper surfaces of the holding frames 51 and 52 are polished together with the magnetic gaps 56 and 57 into an arc-shaped cross section.

[0004]

However, the magnetic head is required to be downsized as the magnetic card reader is downsized. Further, the conventional magnetic head having the auxiliary winding has to be large in size.

Further, for the purpose of miniaturization, if the pitch (track pitch) of the two-track magnetic head is reduced,
The dimension 73 between the coils is reduced, and the insulation resistance between the coils, the winding space, the shape of the core, and the like are problematic.

Accordingly, it is an object of the present invention to provide a magnetic head which can be downsized irrespective of a magnetic head having an auxiliary winding.

[0007]

According to the present invention, there is provided a magnetic head comprising:
A magnetic head formed by abutting an auxiliary core and a lead core with each other via a gap material to form a magnetic gap, housed in a holding frame and polishing the magnetic gap portion in an arc shape, wherein an end face of the auxiliary core is A two-track combination magnetic head is formed by abutting a pair of lead cores, each of these lead cores having first and second lead windings for reading, and the auxiliary core has one auxiliary winding. It is characterized in that two tracks can be simultaneously encoded on a magnetic recording medium using lines.

[0008]

[0009]

[0010]

[0011]

According to the present invention, the magnetic head comprises a two-track head, and in order to reduce the track pitch of the two-track head, the auxiliary core is shared by two turns and the winding is also formed by one coil, so that the distance between the coils is reduced. Insulation resistance, winding space and core shape can be reduced.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing a magnetic head according to an embodiment of the present invention. As shown in FIG.
Has an outer shell formed by a pair of substantially prismatic holding frames 2 and 3. The upper surface portion 4 of the magnetic head 1 is formed as a cylindrical surface, and the abutting portions of the holding frames 2 and 3 are centered.
A U-shaped window 5 is formed. Tip portions of a magnetic core (hereinafter, referred to as an auxiliary core) 8 having magnetic gaps 7, 7 ′ in the window portion 5 and magnetic cores for reading (hereinafter, referred to as first and second lead cores) 11, 12. Are formed in the same shape as the cylindrical surfaces of the holding frames 2 and 3. Terminal substrates 14 and 15 having a plurality of holes 13 are provided on both sides in the longitudinal direction of the lower portion of the magnetic head 1.

FIG. 2 is an exploded perspective view showing a method of manufacturing the magnetic head of FIG. As shown in FIG. 2, the magnetic head includes one auxiliary core 8 provided with an auxiliary coil (hereinafter referred to as an auxiliary winding) 16 and first and second lead windings 1.
A pair of first and second lead cores 1 provided with 7, 18
The magnetic gap portions 7 and 7 ′ are abutted with each other via one gap member 6 having the same length as the width of the auxiliary core 16.
Are formed, and the butted auxiliary core 16 and the first and second lead cores 11 and 12 are sandwiched between the windows 5 of the holding frames 2 and 3, and the molding resin is put into the pair of holding frames 2 and 3.
And is polished in an arc shape so that the magnetic gap portions 7 and 7 ′ become vertices.

FIG. 3A is a perspective view showing a central core 11a of the first lead core 11, and FIG.
1 is a perspective view showing a first lead core 11 having a lead winding 17 of FIG. As shown in FIGS. 3A and 3B, the first lead core 11 includes a U-shaped central core 11a, a first lead winding 17 wound on the core, and a first lead core 17a.
And a pair of U-shaped dummy cores 11b for allowing the lead windings 17 to escape. The center core 11a having the lead winding 11 and the dummy core 11b are sandwiched from both sides so that the U-shape is reversed. Although not shown in FIG. 3, the second lead core 12 is configured similarly to the first lead core 11.

FIG. 4 is a top view showing the magnetic flux leakage 24 in the gap when a direct current is applied to the auxiliary winding 16 of the magnetic head 1 of FIGS. For comparison, FIG.
5 shows a magnetic leakage 74 in a gap portion when a direct current is applied to the auxiliary winding of the magnetic head 50 shown in FIGS. 5 and 6.
As shown in FIG. 4, the magnetic leakage of the magnetic head according to the embodiment of the present invention is the same as the magnetic leakage 74 of the conventional magnetic head shown in FIGS. However, in the magnetic head 1 according to the embodiment of the present invention, the pitch 23 between the two gaps is clearly reduced, and the width 19 is also smaller than the width 75 of the conventional magnetic head.
It is smaller than. In the magnetic head 1 according to the embodiment of the present invention, there is no change in the method of use by using two tracks for the auxiliary magnetic core. Further, in the case of the conventional magnetic head, two auxiliary current circuits are required, but in the magnetic head according to the embodiment of the present invention, the auxiliary winding has one auxiliary winding.
Therefore, only one auxiliary current circuit is required. Thereby, the size of the magnetic head can be reduced. When an encode signal is input to the auxiliary winding, it is possible to encode the magnetic medium on two tracks at the same time.

[0017]

As described above, according to the present invention, 2
It is a track combination magnetic head that can provide a miniaturized magnetic head that can simultaneously encode two tracks using one auxiliary core.

[Brief description of the drawings]

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

FIG. 2 is an exploded perspective view showing a method for manufacturing the magnetic head of FIG. 1;

FIG. 3A is a perspective view showing a central core of a read core of the magnetic head of FIG. 1; FIG. 2B is a perspective view illustrating a read core of the magnetic head of FIG. 1.

FIG. 4 is a top view showing magnetic leakage of the magnetic head of FIG. 1;

FIG. 5 is a perspective view showing a magnetic head according to a conventional example.

FIG. 6 is an exploded perspective view showing a method of manufacturing the magnetic head of FIG. 4;

FIG. 7 is a top view showing magnetic leakage of the magnetic head of FIG. 4;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic head 2,3 Holding frame 6 Gap material 7,7 'Magnetic gap part 8 Auxiliary core 11,12 First and second lead core 15 Auxiliary winding 17,18 First and second lead winding

────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-63-231711 (JP, A) JP-A-55-64628 (JP, A) JP-A-3-214407 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) G11B 5/29 G11B 5/17 G11B 5/09 371

Claims (1)

(57) [Claims] A magnetic core formed by abutting an auxiliary core and a lead core with a gap material therebetween to form a magnetic gap, housed in a holding frame and polishing the magnetic gap portion in an arc shape; A pair of the lead cores abut against the end face of the two-track combination magnetic head comprising first and second lead windings for each of these lead cores.
A magnetic head, wherein the auxiliary core includes one auxiliary winding, and two tracks can be simultaneously encoded on a magnetic recording medium using the auxiliary winding.