JPS615416A - Multi-channel magnetic head - Google Patents

Abstract

PURPOSE:To improve the magnetic efficiency of a multi-channel magnetic head, by providing a recessed groove for winding which is almost vertical to the gap depth direction passing through a winding hole at the surface of the main core facing a spacer and installing winding to the groove. CONSTITUTION:A recessed groove 14 which is almost vertical to the gap depth 13 direction passing through a winding hole 12 is provided in the surface 11 of a main core 2 facing a spacer 1. Winding 4 is wound around the main core 2 and auxiliary core 3 through the winding hole 12 and groove 14. The groove 14 has such a depth that the winding 4 is not projected from the surface 11 when installed. Head chips H1 and H2 composed of the main and auxiliary cores 2 and 3 are bonded to the spacer 1. The back section 15 of the main core 2 is not cut off. Since the main core 2 can be bonded directly to the spacer 1 and it is not necessary to cut off the back section 15, the gap is not widened and the winding is installed in the horizontal direction from the winding hole 12 and, as a result, the magnetic efficiency can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a multi-channel magnetic head used in electronic camera devices and the like. .

(b) Prior Art Research and development of electronic camera devices that store and record still image information on magnetic recording media is progressing. The recorded information is converted into a television signal and displayed on the screen of a television receiver or on a suitable piece of paper. This electronic camera device is basically required to have the same amount of information as a conventional VTR, and the frequency band and relative speed of the recording medium and magnetic head are also 1 to 1.
Since it can be used at 12 MHz and 7 to 9 m/s, a magnetic head with performance similar to that used in VTRs is required.

In addition, in order to obtain images with higher fidelity, this electronic camera device uses a frame recording method, in which signals for two fields of a television signal are specially recorded on two recording tracks, and these are sequentially and repeatedly played back during playback. In this case, since the conventional single-channel magnetic head, which is often used in VTRs, has complex circuits and mechanisms, it is necessary to place head chips for two channels very close together. Moreover, there is a need to develop a two-channel in-line magnetic head that has aligned gaps and minimizes mutual crosstalk.

In order to make the electronic camera device compact, this magnetic head forms a large number of tracks on a small recording medium (for example, a magnetic disk with a diameter of about 47 mm), so the track width must be extremely narrow (for example, 40 to 60 um). Moreover, since the recording medium is of a metal-coated or metal-deposited type for densification, it is necessary to use an Fe-AQ-8i alloy or an amorphous magnetic alloy with a high saturation magnetic flux density.

Incidentally, although various forms of i-channel inline type magnetic heads are described in Japanese Patent Publication No. 55-2647, none of them are recognized as being suitable for electronic camera devices. Although there is no example of the size of the core, from its structure, the contact surface against the magnetic sheet is composed of two cores and a non-magnetic material sandwiched between them, which provides wear resistance. This is because it is recognized as a large-sized device suitable for audio use, etc.

On the other hand, the present applicant has proposed the structure of a multi-channel magnetic head suitable for the above-mentioned electronic camera device in Japanese Patent Application No. 59-4108.

That is, as shown in FIGS. 4 and 5, the proposed magnetic head has a pair of Herad chips (1) of substantially the same shape on both sides of a central shielding spacer (1).
Hl) (Hl), and its head chip (Hl)(H
l) is a main core (2) made of a metal magnetic material such as sendust, and an auxiliary core (3) placed outside this main core.
and a fill (4) attached to the auxiliary core, and the main core (2) has a front gap (5) with a track width of 30u+t and a magnetic pole part (6) facing the front gap (5) with a fixed interval.
) (7) and is adhered to the surface of the spacer (1). The thickness of this main core (2) is 30 mm, which is the same as the track width. The auxiliary core (3) includes a U-shaped magnetic body part (8) made of an oxide magnetic material, and is arranged above the magnetic body part so as to surround the opening side of the magnetic body part (8). a non-magnetic material part (9), and a coil (4) in the center.
It is provided with a through hole (10) for winding.

The vertical part of the magnetic body part (8) is the magnetic leg part of the main core (2)
The horizontal portion of the magnetic body portion (8), which is magnetically coupled to ll□ (6) and (7), short-circuits both magnetic leg portions. A coil (4) can be attached to this horizontal portion using the through hole (10).

The material of the spacer (1) is phosphor bronze, Be-C.
u, molybdenum, etc.

By the way, in the above-mentioned conventional magnetic throat, the main core (2) is
Since the back part of the winding hole (10) is continuously separated from the winding hole (10), there is a drawback that the gap (5) opens during the manufacturing process. Further, since the winding (4) is wound only around the reinforcing core (3), the recording/reproducing efficiency may be reduced depending on the state of the adhesive layer with the main core (2). Furthermore, auxiliary core (3)
Since the winding (4) is applied to the back part of the coil, the efficiency becomes even worse.

(C) Problems to be Solved by the Invention The present invention solves the problem of the main core gap opening in the manufacturing process and the decrease in recording/reproducing efficiency.

(d) Means for solving the problem A concave groove for winding is provided on the surface of the main core that is in contact with the spacer, passing through the winding hole and approximately perpendicular to the gap depth direction, and winding is carried out in the concave groove. did.

(E) Function Since the winding is provided in the groove, the winding does not protrude beyond the surface facing the spacer, and therefore the main core can be directly joined to the spacer. By doing so, it is possible to wind the core including the main core, and to make the winding the tape-contacting side.

(f) Example In the present invention, as shown in FIGS. 1 and 2, the main core (2)
A winding hole (12) is formed on the surface (11) facing the spacer (1).
) is provided with a concave groove (14) perpendicular to the direction of the gap depth (13), and the winding (4) is connected to the main core (2) and the auxiliary core (3) as shown in Fig. 2. The winding hole (1
2) and the concave groove (14). The groove (14)
) shall be formed to have such a depth that it does not protrude beyond the surface (11) when the winding (4) is applied.

A head chip consisting of a main core (2) and an auxiliary core (3) prepared by sandwiching a spacer (1) as shown in Figure 1.
(Hl) (Hl) can be bonded to the spacer (1) with a suitable adhesive. It should be noted that the back portion (15) of the main core (2) is not separated as in the conventional example shown in FIG.

As a specific numerical example, the thickness of the main core (2) is 60 tiles, the depth of the groove (14) is 30-1, and the wire diameter of the winding (4) is 2.
0 to 30-.

A method of manufacturing the above magnetic head is shown in FIG.

In (a) of FIG. 3, 0.7
The main core (2) sliced to a thickness of ~o, smn is pasted on a base (17) having a flat surface (16), and is made into a chip with a thickness of about 0.611111 by lapping and mirror polishing.

Next, as shown in (b), the portion to be wound is grooved to form a groove (14). In this process, the MEEC groove processing method is used to prevent large cutting forces, machining distortion, paring, etc. from occurring on the chip.
A similar result can be obtained by grooving or etching under conditions similar to /@il.

In the next step (C), polishing is performed again to adjust the groove depth to 0.03 mm.

In (d), the surface (11) formed with the groove (14)
is applied to the flat surface (16) and polished to a specified thickness (0,061 m), and then the flat surface (16
) and heat treated, (a') and (b')
1 is a view of the main core (2) when viewed from the -front side, and shows the positional relationship between the winding hole (12) and the groove (14).

In (e), for the zeroth order (f) in which the auxiliary core (3) is attached and joined to the main core (2), the winding (4) is wound so as to be buried in the groove (14).

Finally, in (g), a pair of Herad chips (Hυ (H2)) formed symmetrically with the spacer (1) in between are joined to the spacer (1).

(G) Effects of the Invention According to the present invention, since there is no winding intervening at the joining surface of the main core and spacer, the main core and spacer can be directly attached, and there is no need to separate the back part of the main core. Therefore, there is no possibility that a gap will open during manufacturing.Furthermore, in the present invention, since the winding is applied horizontally rather than downward from the winding hole (12), magnetic efficiency is improved.
^ Moreover, since it is a type 1 winding not only on the auxiliary core but also on the main core, it has the effect of further increasing efficiency.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view of a multi-channel magnetic connector according to the present invention. FIG. 2 is a side view showing a part of the structure, and FIG. 3 is a diagram illustrating a method of manufacturing the magnetic throat shown in FIG. 1. FIG. 4 is a perspective view of a conventional multi-channel magnetic head, and FIG. 5 is an exploded perspective view thereof. (1)...Spacer, (2)...Main core, 4).
... Winding wire, (12) ... Winding hole, (13) ... Gear embedding depth, (14) ... Concave groove, (Hl) (H2)
...head chip.

Claims (1)

[Claims] (1) In a multi-channel head formed by integrating two head chips with a non-magnetic shielding spacer in between, a gap depth is formed through a winding hole on the surface of the main core constituting the head chip that faces the spacer. A multi-channel magnetic head characterized in that a groove is provided substantially perpendicular to the direction, and a wire is wound within the groove.