JPS58171710A - Magnetic head - Google Patents

Abstract

PURPOSE:To constitute a head for recording and reproducing, by butting one of both ends of a wide U-shaped core, where a coil is wound, and that of a narrow similar core to each other through a magnetic gap material and butting two auxiliary cores to said both cores. CONSTITUTION:One of both ends of a wide U-shaped core 1 where a coil 6 is wound and that of a narrow core 3 where a coil 7 is wound are butted to each other through a magnetic gap material 9. Auxiliary cores 8 and 8 are butted to one end of the core 1 through the magnetic gap material 9, and they are butted to the core 3 overall through a magnetic gap material 10. At a recording time, the gap 9 formed by cores 1, 3, and 8 is used to impress a signal through the coil 6; and at a reproducing time, only the magnetic gap between cores 1 and 3 is used to read out the signal from the coil 7. Thus, the polishing face is reduced in the production, and the head for recording and reproducing where the characteristics for reproducing is excellent is constituted.

Description

[Detailed Description of the Invention] This relates to a magnetic head that has both functions. - Conventional magnetic heads in magnetic recording are used for recording.

Often created separately for playback. Dual gap type heads are also used, which are assembled into one head for recording and playback.

Due to the complexity of the structure, etc., it becomes expensive.

Some of Dual Ga and Petizo can be manufactured relatively cheaply, and only core combinations are available.

Shown in Figure 1. In FIG. 1, to the abutting portions 11 and 12 of the U-shaped core 1 to which the winding 6 is applied, indicated by the dashed line,
The plate-shaped core 2 is brought into contact with the abutting portion 11 on the - side with the magnetic gap material 4 interposed therebetween, and then a relatively wide U-shaped core with a winding 7 is placed on the back side of the plate-shaped core 2. 3 to one of the abutting portions 13 while sandwiching the magnetic gap material 5 thereto.

A magnetic head having two long magnetic gaps D for recording (given by 4) and a short magnetic gap D for reading (given by 5) is obtained.

The reason why the recording gap is wider than the reproduction gap is to prevent reproduction accuracy from being degraded even when the recording medium is displaced in the direction perpendicular to the running direction, that is, in the width direction of the magnetic head.

In this structure, since the magnetic gaps are far apart, it is difficult to bring a stiff magnetic medium such as a magnetic card into close contact with both magnetic gaps. Ru. Furthermore, during recording, there is a drawback that recording is performed in a phase-shifted state even in the reproducing magnetic gap. Also, in manufacturing, cores 1 and 2. Since the abutting surfaces of cores 2 and 3 need to be flat, the abutting surface of core 1 with core 2 and the abutting surface of core 2 with core 1 are used.

It is necessary to polish four surfaces: the abutting surface of the core 2 with the core 3, and the abutting surface of the core 3 with the core 2, which is complicated.

The present invention eliminates these drawbacks and provides a magnetic head that is easy to manufacture and has both recording and reproducing functions, in which one magnetic gap is used as a recording gap and the negative part is used as a reproducing gap. This is what I am trying to do.

The present invention has a first core having a U-shaped cross section and a first winding in the center thereof, and a second core having a U-shaped cross section and having a narrower width than the first core in the center thereof. a second core provided with a winding and abutted against the first core so as to form a loop-shaped magnetic path; and a second core of the first core.
an auxiliary core abutted against the first core on both sides of the abutment surface with the core; and an auxiliary core abutted against the first core on both sides of the abutment surface with the core; a first magnetic gap material disposed extending therefrom between the first core and the auxiliary core;

a second magnetic gap material disposed between the second core and the auxiliary core; the magnetic gap material provides a magnetic gap having a width of the first core for magnetic flux passing through the first core; The magnetic head is characterized in that a part of the magnetic gap corresponds to the magnetic gap for the magnetic flux passing through the second core.

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention shown in the drawings will be described in detail below.

With reference to FIGS. 2 and 3 showing embodiments of the present invention,
A first core 1 with a first winding 6 provided thereon.

A relatively narrow second core 3 with a second winding 7 is
A first magnetic gap material 9 is interposed between one abutting portion, and the second core 3 is abutted against each other to form a loop-shaped magnetic path.
A rod-shaped auxiliary core 8 is brought into close contact with the second magnetic gap material 10 on both sides.

At this time, the other surface of the auxiliary core 8 is the aforementioned first magnetic gap material 9.
It is also brought into contact with the first core 1 via both end portions, and similarly forms a loop-shaped magnetic path.

To the magnetism configured in this way, 1 wide 7. #1111+ is written on the first winding 6 applied to the first core 1 of
', by flowing Mt, recording is performed in the magnetic gap 9 of 1 width of the 1 wide first core 1, and during reproduction (i), the output is taken from the second wire 7, The reproducing function can be achieved by the core width of the second core 3.

That is, during recording, the magnetic flux from the wide first core 1 forms a closed magnetic path passing through both the narrow second core 3 and the auxiliary cores 8 on both sides of the narrow second core 3. So 2
The magnetic gap spanning the entire width of the wide first core 1 contributes to the recording operation, but during reproduction, the magnetic flux interlinking with the second winding 7 for reproduction is transmitted through the narrow second core 3. The magnetic flux that is picked up by the wide first core 1 and the auxiliary core 8 does not interlink with the second winding 7 for reproduction. Only a portion of it is used. Note that a second magnetic gap material 10 is interposed so that the magnetic flux picked up by the wide first core 1 and the auxiliary core 8 does not flow into the narrow second core 3 for reproduction.

As described above, according to the present invention, one magnetic gap can be shared for recording and reproduction, and the recording width is made larger than that for reproduction, so that reproduction can be performed even when the magnetic head is shifted in the width direction during reproduction. The first matched through 9 with reduced precision
Since the butt assembly can be performed by polishing only the abutting portions of the I71, the second core 3, and the auxiliary core 8, the head can be manufactured at a lower cost than conventional dual gap type magnetic heads.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a dual-gap type magnetic head from X. FIG. 2 is a perspective view showing one embodiment of the present invention, and FIG. 3 is an exploded perspective view thereof. ]...First core, 3...Second core, 6,7...
・First and second windings, 8... Auxiliary core, 9.10
...first and second magnetic gap materials.

Claims (1)

[Claims] 1. A first winding having a U-shaped cross section and having a first winding in the center thereof.
a core having a U-shaped cross section, a narrower width than the first core, and a second winding in the center thereof, the core being located at the center of the abutting surface of the first core. and a second core abutted against the first core to form a loop-shaped magnetic path. two auxiliary cores abutted against each other to form a loop-shaped magnetic path with the first core on both sides of the abutment surface of the first core with the second core;
a first magnetic gap material disposed between the first and second cores and extending from there between the first core and the auxiliary core at one of the abutting portions of both ends of the core; 2
a second magnetic gap material disposed between the core and the auxiliary core, and the first and second magnetic gap materials allow magnetic flux passing through the first core to be directed to the first core. A magnetic head characterized in that a magnetic gap having a width is provided, and a portion of the magnetic gap serves as a magnetic gap for magnetic flux passing through the second core.