JPH01109503A - Magnetic head - Google Patents

Abstract

PURPOSE:To prevent the magnetic saturation and the separation between laminated cores by making a part excluding a sliding surface with a recording medium into a partial magnetic material. CONSTITUTION:A laminated layer core half body 5 is formed by providing a level difference part 8 to remain the all areas of a tape sliding front surface and remove a part with a suitable depth 7. Next, approximately at the all areas of the level difference part 8, a magnetic layer 9 to stick a thin plate such as an amolphous, 'Sendust(R)' or ferrite is provided. Namely, since a magnetic layer material 9 stuck by a sputtering, etc., is combined with a magnetic layer 1 in the half body 5 and widely exists even on auxiliary plates 2 and 3, the magnetic core cross section of the half body 5 is increased, a magnetic resistance is minimized, a magnetic flux is easy to pass through, the magnetic saturation is hard to occur and a sufficient recording characteristic is obtained. The magnetic material layer 9 is firmly combined between the laminated cores of the half body 5 and the intensity to the separation between the laminated layers is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention mainly relates to a structure for preventing magnetic saturation or separation between laminated cores in a VTR magnetic head.

(Prior Art) FIGS. 2A and 2B are explanatory diagrams showing the schematic structure of a conventional multilayer magnetic head. The figure (A) shows a pair of core halves in which a metal magnetic material layer 16 having a thickness approximately equal to the head track width TW, such as an amorphous alloy or Sendust alloy, is laminated with an auxiliary plate 17 made of a non-magnetic material such as glass or ceramic. 18 and the core half 19 are glued together from the vicinity of the winding window 20 with low melting point glass 21, etc., and the head gap g is
This is a laminated magnetic head body 22 formed with.

In such a conventional laminated magnetic head, the magnetic material layer 16 clearly occupies a small amount in the head laminated core.

Further, in VTRs and the like, there is a combination type head in which two heads are used and the distance between the head gaps is set close to each other.

A combination head uses one head for recording and playback,
By dedicating the other side to reproduction only, a reproduced image with less noise can be obtained. Another case is when a combination type head is used to record the image signal and YC separately, or to use the head for each YC signal.

(Problems to be Solved by the Invention) A combination head with a laminated core has a core half 19 consisting of a long tape sliding length Q, and a core consisting of a short tape sliding length Q2, with the gap g as a boundary. Many of them are composed of two halves 18. Therefore, in the case of the half-core core 18 with a short tape sliding length, the magnetic material layer 1 occupies the core half-body 18.
6 had a structure in which the number of cases decreased gradually. Such magnetic material layer 1
The core half 18 with a small number of cores 18 has a problem in that saturation development of the core occurs during high-density recording using a high coercive force tape such as a metal tape, and partial recording is not possible.

Furthermore, the figure (B) shows that in order to prevent such saturation development during recording, there is a structure in which ferrite magnetic plates 23 are laminated from both sides of the metal magnetic material layer 16 in areas other than the tape sliding surface. Although it is effective against saturation, such cores simply laminated via an adhesive have a weak adhesive force between the laminated cores, and peeling between the laminated layers occurs.

This has led to problems such as deterioration of head characteristics and damage to the head structure, resulting in a reduction in quality.

(Means for Solving the Problems) An object of the present invention is to provide a magnetic head that prevents magnetic saturation or separation between laminated cores.

In order to achieve the above object, the present invention provides a magnetic head using a laminated core in which auxiliary plates made of non-magnetic material are laminated on the upper and lower sides of a magnetic layer core. It is made of magnetic material.

(Function) Since the magnetic head according to the present invention has a structure in which the magnetic material is added from the cross section of the laminated core, the cross-sectional area of the magnetic core can be increased.

Therefore, the recording saturation phenomenon of the magnetic cores can be prevented, the laminated cores can be firmly connected, and the peel strength between the laminated cores can be increased.

(Example) Fig. 1(A) shows a pair of auxiliary plates 2 and 3 made of non-magnetic material such as glass or ceramic laminated from above and below a magnetic layer 1 made of amorphous or sendust with a thickness equal to the head track width TW. This is a perspective view of a magnetic head body 6 in which a head gap g is formed between a laminated core half body 4 and a laminated core half body 5, as viewed from the tape sliding front surface F. The tape sliding length Q□ of the laminated core half 4 is overwhelmingly longer than the tape sliding length Q2 of the laminated core half 5.

The laminated core half 5 leaves the entire area of the tape sliding front surface,
A stepped portion 8 is formed by removing a portion of the stepped portion 8 to an appropriate depth 7 in the thickness direction.As shown in FIG. A magnetic material layer 9 is provided by adhering a thin plate of Sendust, ferrite, or the like by adhesion or sputtering. That is, the magnetic layer material 9 deposited by sputtering or the like is combined with the magnetic layer 1 in the laminated core half-hole 5 to form the auxiliary plate 2.3.
Since it is widely present on the upper surface, the cross-sectional area of the magnetic core of the laminated core half 5 is increased, the magnetic resistance is reduced, the magnetic flux is easily passed through, magnetic saturation is difficult to occur, and sufficient recording characteristics can be obtained.

The magnetic material layer 9 deposited by sputtering is firmly adhered from the magnetic layer 1 in the laminated core to the non-magnetic auxiliary plates 2 and 3, so that the laminated core half 5 with a short tape sliding length Q2 is It firmly connects the laminated cores and increases the strength against peeling between the laminated layers.

In the same figure (C), a magnetic material layer 9 is attached from the side surfaces of both core halves forming a spacing gap g to increase the cross-sectional area of the magnetic core 1, improve the recording characteristics, and reduce the magnetic resistance of the head core. This figure shows a magnetic head body 6 that has improved circuit efficiency and is provided with a winding IO.

According to the magnetic head of the present invention as described above, the magnetic layer of the head core can be expanded without increasing the head core width (tape sliding length), and a highly saturated magnetic head can be constructed.

(Embodiment 2) Another embodiment is shown in FIG. A magnetic material layer 1 is formed on the surface 13 of the core halves 4 and 5 from which at least one of the upper and lower auxiliary plates has been removed.
4 is added in the form of a plate or by sputtering. The magnetic material layer that connects both core halves is
In addition to increasing the mechanical bonding strength between the two core halves, it also reduces the recording saturation phenomenon in terms of characteristics, reduces the magnetic resistance of the head body, increases core efficiency, and improves head characteristics.

In addition, in the embodiment of the present invention, for example, FIG. 1(B)
As shown in (D), the magnetic layer 1 in the laminated cores 4 and 5
has a multilayer structure with an insulating layer such as Sio interposed between the layers, the magnetic material layer 9 attached from the laminated cross section of the present invention
It is preferable to provide an insulating layer 15 such as SiO□ also between the two. The insulating layer 15 has the effect of reducing eddy current loss due to high frequencies in the magnetic layer 1 in the laminated core.

(Effects of the Invention) The present invention provides a head body using a laminated core as described above, without changing the core length corresponding to the tape sliding length.
By adding a magnetic layer to the cross section of the laminated core, the cross section of the core can be increased. Therefore, the core saturation phenomenon during recording is prevented and the strength against peeling between the laminated cores is increased. We were able to improve the recording characteristics and magnetic core efficiency of the magnetic head, thereby improving the head characteristics and quality.

[Brief explanation of the drawing]

Figures 1 (A), (B), (C), and (D) are schematic perspective views showing the configuration of a magnetic head according to the present invention, and Figures 2 (A) and (B) are configuration diagrams of a conventional magnetic head. FIG. 1 ... Magnetic layer, 2, 3 ... Auxiliary plate, 4゜5 ・
... Core half body, 6... Magnetic head body. 7... Step depth, 8... Step portion, 9... Magnetic material layer, 10... Winding wire, 11... Gap depth, 12...
... Winding window, 13... Surface from which at least one of the upper and lower auxiliary plates has been removed, 14... Magnetic material layer, 15... Insulating layer. Figure 1 Figure 2 (A) 16ra-f% Village 1 17th draft)

Claims (5)

[Claims] (1) A magnetic head using a laminated core in which the upper and lower sides of the magnetic layer core are laminated with auxiliary plates made of non-magnetic material, characterized in that the portion other than the front surface where it slides with the recording medium is partially made of magnetic material. magnetic head. (2) The magnetic head according to claim (1), wherein the part is a laminated core made of a magnetic material. (3) For the above part, a part of the auxiliary plate made of non-magnetic material is removed,
A magnetic head according to claim 1, wherein the portion is made of a magnetic material. (4) The magnetic head according to claim (1), wherein the magnetic material is plate-shaped. (5) The magnetic head according to claim (1), wherein the magnetic material is a sputtered film layer.