JPS5945624A - Magnetic head - Google Patents

Abstract

PURPOSE:To obtain a magnetic head which is capable of stable record/reproduction even with high recording density and also can be easily produced, by cutting a magnetic head block produced by joining together four pieces of rectangular parallel piped magnetic matters containing grooves on their surfaces opposite to a recording medium. CONSTITUTION:A winding groove is formed longitudinally to the 1st core block 30, and plural grooves 34 having width are provided to a side surface 33 with space (l+m). At the same time, plural grooves 37 of width l are provided to the side surface 36 of the 2nd core block 35 with space (l+m). Plural grooves 40 of width (m) are provided to the side surface 39 of the 3rd head core 38 with space (l+m). A winding groove is provided longitudinally to the 4th core block 41, and at the same time plural grooves 45 of width (m) are formed on the side surface 44 width space l+m. These core blocks 30, 35, 38 and 41 are butted in parallel to each other, and center parts 46 of grooves 34 and 37 are cut in parallel to these grooves. Thus plural magnetic heads are obtained. Such a magnetic head can perform stable record/reproduction even with high recording density and also can be easily produced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] Invention 1c3: This invention relates to a 71 popular head that is capable of stable recording and reproduction, is compact, and easy to manufacture in a high track density magnetic recording device.

[Technical background of the invention and its problems]

2) When creating a recording track and a turbulence by accumulating in the circumferential direction of a circular or plate-shaped disk such as a 1% air disk, if the track width is increased by 1 degree to increase the recording capacity H, the magnetic head will Crossing from adjacent tracks is likely to occur due to misalignment with recording tracks. Therefore, in order to prevent such a problem, conventionally a method has been adopted in which erasing cores are provided on both sides of the recording/reproducing core, and the area near the image edge of the track immediately after all signals are recorded is tunnel erased.

FIG. 1 shows an example of a conventional magnetic head.

Core 1 and core 2, which have approximately the same width as the recording track width, are all combined, a gap 3'fr: for recording and reproduction is provided between them, and an L-shaped non-magnetic magnet with the same width is provided on the opposite side of the gear tool l surface of core 2. The recording/reproducing head element part A is made by joining the body 4 so that the side surfaces of the core 1, the core 2, and the non-magnetic material 4 are all on the same plane, and the core 5 and the core 6 having the same width are all combined, and the erasing is performed between them. A gap f7f is provided for the gap, and a non-magnetic material 8 having the same width as the core 6 is placed on the opposite surface fll11 of the core 6 so that the side surfaces of the core 5, the core 6, and the non-magnetic material 8 are all flat. A pair of bonded erasing head element parts B are respectively provided, and erasing head element parts B' are provided on both sides of the recording/reproducing head element part A, and the core part of each head element part and a non-magnetic material are in contact with each other. Further, a winding hole 9 for winding the recording wire between core 1 and core 2 and a winding winding for winding for erasing between core 5 and core 6 are provided. It has a shape with 10 wire holes.

With this shape, during signal recording, tunnel erasure is performed by the pair of erasing gaps 7 near both edges of the recording track formed by the recording/reproducing gap 3, so that both sides of the recording track are almost The guard band becomes a complete no-signal state, and even if there is a misalignment between the head and the track during playback, crosstalk from adjacent tracks (0) is almost eliminated.
The recording/reproducing head element section and the erasing head element section must be made separately and then joined together, and alignment between the gaps is extremely difficult.
It is. Furthermore, in order to increase the linear recording density and the track width, it is necessary to narrow the gear gap between the recording/reproducing gap 3 and the erasing gap 7 and the track 1 depression. Width f: Must be made narrower or thinner, and as a result, the magnetic resistance of the 1F and 1 paths of the head core becomes too strong9, and sufficient reproduction output voltage cannot be obtained.
Furthermore, there were many drawbacks, such as the fact that many cores were missing during core cutting, making machining extremely difficult.

[Purpose of the invention]

In order to eliminate these drawbacks, the present invention provides four rectangular parallelepiped core blocks each having a plurality of parallel grooves in the width direction facing the medium! By joining the entire magnetic head block and cutting it parallel to the grooves of the commercial head block, it is easy to mold even when the recording density is high, and it is possible to achieve sufficiently stable recording and playback. The drawings are explained below in Note 1.

[Embodiments of the invention]

FIG. 2 shows an embodiment of the present invention, in which a core material 20 is made up of a part of gold for the magnetic path of the recording/reproducing head element section A, and a core material 20 is wound on a surface perpendicular to the magnetic path 21 facing the medium. ■A groove 22 is provided for both sides 11 of the surface facing the medium. The I end is used for the winding wire, and the first helad core is cut in one orthogonal direction. With the core layer forming, the first
Similar to the blade core 20, both 1 of the surface 21 facing the medium
till gi, i is the same as the first core 20 111iv
! The second head core 24, which was cut by the second head core 24, is the recording gear gear formed between the first herad core 20 and the second head core 23, and the gap ill? ri is defined by the core width m of the surface 21 of the first Herad core 20 and the second Herad core 23 that faces the medium. Reference numeral 26 denotes a core 7 that constitutes a part of the magnetic path of the erasing magnetic head element section B. A core 7 having a width of about m in the thickness direction 1 is provided at the center of the surface 2 facing the medium. 3, a core 27 constitutes a part of the magnetic path of the erasing magnetic head element part B, and is provided with a groove 28 for a % line perpendicular to the surface 21 facing the body; , a fourth head core 29 is provided with a groove 26 of approximately m in the vertical direction of the surface in which the wire groove is provided in the center of the surface 2 facing the medium; Insert the core 27 into the groove 2
6 are joined so that they are on the same straight line, a pair of erasing gaps are formed between them, and the gap width 1/2 is equal to the width of the third Herad core 25 and the core 27 of fd↓4. is defined by 1-child 26. Further, the erasing head element %l (with B facing each other's medium) is on the same plane as the recording/reproducing head element part A, and the surface 21 of the recording/reproducing head element part A facing the medium is The second helad core 23 and the third head core 25 are joined so that the convex portion and the i'i'>26 of the erasing head element part B are on the same straight line, and the recording/reproducing gap f24 is , a pair of parallel erasing gaps 29 are formed separated by the thickness of the head core 23 of Era 1 and 2 and the head core 25 of Era 1 and 3.

Fig. 3 1'l: This is a diagram showing the core block removed by cutting out the first herad core 20 of Fig. 2, and 30 is a rectangular parallelepiped magnetic material 11ull and 31 has a winding groove 32. is provided along the length direction, and further on the side surface 33 that intersects the 111111 plane 3 I, along the direction perpendicular to the 1111 plane 31, the first 47t where -1 is l; s 4 is the length This is a first core block in which several pieces of one core block are provided at an interval f (1+m) in the direction.

FIG. 4 is a diagram showing a core block material for cutting out the second herad core 23 of FIG. A second groove 37f having the same width l and the same interval (l+m) in the length direction as the first groove 34 of the first core block: This is the second core block provided.

FIG. 5 is a diagram showing a core block material from which the third Herad core 25 of FIG. 3rd of m
This is a third core block in which a plurality of grooves 40 are provided at intervals of (J+m) in the length direction.

Figure 6 is a diagram showing the core block material for cutting out the fourth herad core 2 feet in Figure 2, and 41 is a diagram showing a winding groove on one side 42 of the rectangular parallelepiped magnetic body. 43 are provided along the length direction, and furthermore, grooves 43 are provided on a side surface 44 perpendicular to the side surface 42 in a direction perpendicular to the side surface 42, have the same width m as the third groove 40, and are spaced at the same intervals in the length direction ( This is a fourth core block provided with a fourth groove 45 of l+m).

FIG. 7 is a diagram showing a magnetic head block obtained by joining the first to fourth core blocks shown in FIGS. 3 to 6, in which the side surface 31 of the first core block 30 and the The first groove 34 and the second groove 37 are on the same straight line, and the side surface 33 is perpendicular to the side surface 36 of the second core block 35.
and surface 36 are on the same plane, and then
The side surface of the core block 35 opposite to the side surface to which the first core block 30 is joined, and the third core block 38
- The side surface perpendicular to the side surface 39 is arranged so that the convex portion formed between the second groove 37 and the third groove 40 are on the same straight line, and the side surface 39 is on the same plane as the surface 36. 1+111 opposite to the i''111 surface to which the second core block 35 of the third core block 38 is joined.
and one side of the fourth core block 41 tlt1 side 42
and the third groove 40 and the fourth groove 45 are on the same straight line,
In addition, the first core block 70 to the fourth core block 4 are joined by milling on each other surface so that the surface 39 and the surface 44 are on the same plane. In order to cut the center part 46 of the first groove 34 and the second groove 37 parallel to the grooves,
A plurality of magnetic heads according to the present invention shown in FIG. 2 can be obtained. In actual manufacturing, the grooves are filled with a non-magnetic material such as glass so that the surface facing the medium is flat.

〔Effect of the invention〕

As explained above, the four
Multiple magnetic heads of the same shape can be made from a magnetic head block made by joining magnetic materials made of wood cubes, and even when the track width is narrowed to increase track density, the groove width and spacing can only be narrowed. It is very easy to manufacture. Furthermore, even if the track width is narrowed, the core width does not need to be narrowed so much that the magnetic resistance of the core's magnetic path does not increase as in conventional magnetic heads. Since the core of the erasing head element does not come into contact with the recording track on the recording medium, the signal recorded on the medium is demagnetized by the coercive force of the core of the erasing head element. Takatora without a problem,
It has various advantages, such as being able to record and reproduce very stably even at low temperatures.

[Brief explanation of drawings]

Fig. 1 is an exploded perspective view showing an embodiment of a conventional magnetic head of this type, Fig. 2 is a perspective view showing an embodiment of a main magnetic head, Figs. FIG. 6 is a perspective view showing an example of each core block constituting the 6D magnetic head according to the present invention. FIG. 2 is a perspective view showing an example of a magnetic head blower. 20.23.25+27...Head Cob, 24...
Recording/reproducing gap, 29... Erasing gap, 22
．． 28...Winding groove, 3o/35/38t4no...
Core block, 34, 37, 40.45... adventure? ? t,
Z,? 313t; , s9, 44... 1lul1 side to interrogate with the medium.

Claims (1)

[Claims] When recording signals on a 9M magnetic recording body, in order to tunnel erase the signals on both edges of the recording track formed by the recording/reproducing gap, a magnetic head having a pair of erasing gears 77'' as well as the recording/reproducing gap is used. A recording and reproducing core that forms the reproducing gear 0 and an erasing core that forms the entire erasing gear are each independently provided, and the recording and reproducing core width is the same as the erasing core width, and the recording and reproducing gear lug width is provided. In order to specify this, steps are provided in the direction perpendicular to the gear at both ends of the medium-facing surface of the recording/reproducing core. Furthermore, in order to define the width of the pair of erasing gaps f, the central part f! of the medium facing surface of the erasing core is defined by the shape. : A front is provided in the vertical direction to the erasing gap with a width that is almost the same as the width of the ML recording/reproducing cow cap, and any part of the cross section perpendicular to the -IU11 plane of the erasing core is made into a gate-shaped IK. Magnetic head featuring 0