JPH0318243B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a multitrack magnetic head for magnetic recording or reproduction.

[Prior art]

A typical conventional magnetic head consists of a magnetic core 1 and a winding 2 wound around the magnetic core 1, as shown in FIG.
This type of head is constructed by winding the winding 2 around the core 1 in a straight line, or by attaching the winding 2 to the core 1 by winding the winding in advance around a bobbin. However, with either method, it is not only difficult to wind the coil evenly, but also the completed head becomes large due to the space of the coil. Although thin-film magnetic heads are known as small-sized heads, they have drawbacks such as being mechanically weak, difficult to increase magnetomotive force, and having low reproduction output, making it difficult to provide a practical magnetic head. .

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a multitrack magnetic head that can be easily manufactured and miniaturized.

[Structure of the invention]

To achieve the above object, the present invention includes a folded insulating thin plate, a plurality of through holes provided on each folding surface so as to be lined up along the direction in which the folded portion of the insulating thin plate extends, and A plurality of conductor layers are provided in a spiral shape around the plurality of through holes on the surface and connected to form a winding, and a recording or reproducing gap is inserted into the plurality of through holes. The invention relates to a multi-track magnetic head comprising a plurality of magnetic cores.

[Function and effect of the invention]

According to the above invention, by providing a plurality of through holes so as to be lined up along the direction in which the folded portion extends, it becomes easy to arrange a plurality of magnetic cores in the same state, and the assembly of a multi-track magnetic head is facilitated. becomes easier. Furthermore, since the winding can be obtained by providing the conductor layer in a spiral shape, the winding portion can be made smaller and more uniform.

〔Example〕

FIG. 6 shows an insulating flexible thin plate 5 of a multitrack magnetic head according to an embodiment of the present invention. This flexible thin plate 5 has a plurality of folded parts (bending parts). A plurality of (three) through holes 6 are arranged in each folding surface partitioned by the bending portion so as to extend along the bending portion.
are provided for each. Although not shown in FIG. 6, a coil made of a conductive layer is provided in a spiral shape around each through hole 6, and a magnetic core is inserted into each through hole 6 to form a multi-track magnetic head. .

Next, one of the multi-track magnetic heads shown in FIG.
The structure of the track will be explained with reference to FIGS. 2 to 5. As shown in FIG. 2, the magnetic head for one track consists of a magnetic core 1 and a winding portion 3 made of a flexible printed board connected thereto.
Core 1 combines left half 1a and right half 1b,
A gap 4 for recording or reproduction is provided.
The winding portion 3 includes a through hole 6 provided in an insulating flexible thin plate 5, whose thickness is ignored, and a second
A conductor layer serving as a winding wire, which is not shown in the figures and FIG. 3, is provided, and the through hole 6 connects the core
is combined with

A conductor layer 8 having a pattern shown in FIG. 4 is formed on the front surface 7 of the flexible thin plate 5 by printing technology, and a connecting conductor layer 10 is formed on the back surface 9 as shown in FIG. 5.

As is clear from FIG. 3, the flexible thin plate 5 is folded so that peaks are formed alternately, and a through hole 6 is provided in the center of each folded portion 5a to 5f. Note that this through hole 6 is formed in a size that allows the core 1 to be inserted therein. Although the conductor layer 8 on the surface 7 of the flexible sheet 5 is illustrated in FIG.
The width of the conductor layer is 10 μm, the distance between the conductor layers is 5 μm, and each folded portion 5a to 5d is provided with, for example, 100 to 300 turns. Now, in the head shown in FIG. 2, if 100 turns of the conductor layer 8 are provided in one folded part, the number of turns by the conductor layer 8 in the 12 folded parts will be 1200. The conductor layer 8 on the front surface 7 shown in FIG. 10, and further connected to the conductor layer 8 on this surface through the hole b of the second folded portion 5b. That is, in FIG. 2, a and b, c and d, and e and f are electrically connected. Therefore, when a current is passed through the conductor layers 8, 10, the direction of the current changes alternately in the folded portions 5a to 5d as shown by the arrows in the developed view of FIG. That is, current flows clockwise in the first and third folded portions 5a, 5c, and counterclockwise in the second and fourth folded portions 5b, 5d. However, if you fold this as shown in FIGS. 2 and 3 and look at the direction of the current from the same direction, the directions of the current will all be in the same direction.
In FIGS. 2 and 3, for ease of illustration,
Although the bent portion of the flexible thin plate 5 is at an acute angle, it is preferably folded into a U-shape to prevent the connecting conductor layer 10 from being disconnected, the core 1 is inserted into the through hole 6, and the core 1 is inserted into an insulating material such as epoxy resin. The winding portion 3 is integrated into the core 1 by molding.

[Modified example]

The present invention is not limited to the above-described embodiments, and the following modifications are possible, for example.

(A) A spiral conductor layer may also be provided on the back surface 9 of the flexible thin plate 5 and connected to the spiral conductor layer on the front surface 7. Furthermore, a spiral conductor layer 8 is provided on the front surface 7 of the first and third folded portions 5a and 5c in FIG. 4, and a spiral conductor layer 8 is provided on the back surface 9 of the second and fourth folded portions 5b and 5d. It is also possible to provide a configuration in which the controller is provided.

(B) Instead of providing through-holes a to g to connect each other, an insulating layer is provided on the spiral conductor layer 8, and the folded portions 5a to 5d are connected only on the same surface side. It's good to wear. In addition, the conductor layer 8
The spiral direction of each folded portion 5a-5
d and the direction of the current shown by the arrow in FIG. 4 may be obtained by changing the mutual electrical connections.

(C) Some or all of the spiral conductor layers 8 of the folded portions 5a to 5d may be connected in parallel.

[Brief explanation of the drawing]

Figure 1 is a front view of a conventional magnetic head; Figure 2 is a front view of a conventional magnetic head;
3 is a perspective view schematically showing a part of the magnetic head according to an embodiment of the present invention, FIG. 3 is a perspective view schematically showing the winding portion of FIG. 2, and FIG. FIG. 5 is a plan view showing the surface of the thin plate in the wire portion, FIG. 5 is a back view of the thin plate, and FIG. 6 is a perspective view of the winding portion of the multitrack magnetic head. DESCRIPTION OF SYMBOLS 1...Core, 3...Winding part, 4...Gap, 5...Flexible thin plate, 5a-5f...Folding part, 6...Through hole, 7...Surface, 8...
Conductor layer, 9... back surface, 10... conductor layer.

Claims (1)

[Claims] 1. A folded insulating thin plate, a plurality of through holes provided on each folding surface so as to be lined up along the direction in which the folded portion of the insulating thin plate extends, and a spiral shape centered on the through hole on each folding surface. A multi-track magnetic head comprising a plurality of conductor layers respectively provided in the magnetic head and connected to form a winding, and a plurality of magnetic cores each having a recording or reproducing gap inserted through the plurality of through holes. .