JPH03252911A - Thin-film magnetic head - Google Patents

Abstract

PURPOSE:To decrease the man-hours for assembly of the above head to a rotary cylinder even in the case of constitution of a rotary head cylinder device of a multichannel type by providing plural head forming parts projected by a prescribed distance from the outer peripheral surface of the rotary cylinder and forming a main head part thereon. CONSTITUTION:The plural main head parts 15 are formed on a common substrate 1. The substrate 1 is fixed to the prescribed position of the rotary cylinder 9 at the time of assembly to the rotary cylinder 9, by which the plural main head parts 15 formed on the substrate 1 are simultaneously installed to the prescribed positions 14 projected by the prescribed distance S from the outer peripheral surface of the rotary cylinder 9. The assembly is, therefore, completed simply by mounting the substrate 1 having the main head parts 15 corresponding to the number of channels to the rotary cylinder 9 even in the case of constitution of the rotary head cylinder device of the multichannel type. The man-hours for assembly are drastically decreased in this way.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a magnetic head installed in a rotating head cylinder device such as a video tape recorder (VTR), and more specifically to a magnetic head manufactured by thin film forming technology. This invention relates to thin film magnetic heads.

(Prior Art) As shown in FIG. 5, a thin film magnetic head is manufactured by forming a lower magnetic layer (20), a gap spacer ( 30), a coil conductor layer (50), an upper magnetic layer (40), and an insulating layer (60) were formed, and a protective plate (80) was further fixed on the insulating layer (60) via a bonding layer (7). A magnetic gap portion is formed in the opposing portion of the lower magnetic layer (20) and the upper magnetic layer (40). The magnetic head is fixed to the outer periphery of a rotating cylinder (9) with a sliding surface (13) that contacts the recording medium protruding a small distance S from the outer periphery of the rotating cylinder (9).

According to the thin film magnetic head, a multi-channel magnetic head can be constructed by providing a plurality of main head sections including a lower magnetic layer (20), an upper magnetic layer (40), etc. on the upper surface of a single substrate. (For example, JP-A-1-119911 (G1
1B5/31) ).

(Problem to be Solved) In a rotating head cylinder device installed in a VTR, at least two magnetic heads are arranged with a phase difference of 180 degrees, and the recording density is increased by so-called azimuth recording. Furthermore, in recent years, as many as 16 magnetic heads have been arranged on the same circumference in a common rotating cylinder.

In this case, it is necessary to position and fix a large number of magnetic heads each with a predetermined protrusion amount, resulting in a problem that a large number of man-hours are required for assembly.

Therefore, it is being considered to equip a rotary head cylinder device with a thin film magnetic head that can easily be multi-channeled.

However, in conventional thin-film magnetic heads, at most several main heads are formed on a common substrate at small intervals according to the track pitch. When deploying parts at predetermined intervals,
There is still a problem in that a plurality of thin film magnetic heads with different substrates must be installed separately, which still requires a large number of assembly steps.

An object of the present invention is to provide a thin-film magnetic head having a plurality of main head sections on a common substrate, and to reduce the number of man-hours required for assembling the cylinder compared to the conventional method even when configuring a multi-channel rotary head cylinder device. It is an object of the present invention to provide a thin film magnetic head that can reduce the number of times.

(Means for Solving the Problems) In the thin film magnetic head according to the present invention, the substrate (1) includes:
When attached to the rotating cylinder (9), the center of gravity is at or near the center of rotation of the cylinder, and around the center of gravity, there are rotating cylinders at multiple locations including at least both ends of the diameter line of the rotating cylinder (9). Cylinder (9
) A plurality of head forming portions (14) projecting from the outer peripheral surface by the predetermined distance S, and a main head portion (15) is formed on the upper surface of each head forming portion.

(Functions and Effects) In manufacturing the above thin film magnetic head, a common substrate (1)
The process of forming a plurality of main head parts (15) on the top can be easily realized by a thin film forming process that is substantially the same as the conventional one.

Furthermore, when assembling to the rotating cylinder (9), by fixing the substrate (1) at a predetermined position on the rotating cylinder (9), the plurality of main heads (15) formed on the substrate (1) can be assembled. At the same time, it is installed at a predetermined position protruding from the outer peripheral surface of the rotating cylinder (9) by a predetermined distance S.

Therefore, even when configuring a multi-channel rotary head cylinder device, the substrate (1) equipped with the main head portion (15) according to the number of channels is connected to the rotary cylinder (9).
As assembly is completed simply by attaching it to the holder, the number of assembly steps can be significantly reduced compared to conventional methods.

(Examples) Examples are provided to explain the present invention, and should not be construed as limiting the invention described in the claims or reducing its scope.

Figures 1 and 2 show two main heads (15) (15)
The figure shows a thin film magnetic head of the simplest configuration, comprising a strip-shaped substrate (1) slightly longer than the diameter of a rotating cylinder (9). The substrate (1) is approximately 2 mm
It is a ferrite plate with a thickness of . A lower magnetic layer (2) is formed by forming a film of about 5 μm of sendust on the upper surface of the substrate (1), and furthermore, a coil conductor layer (5) and a gap spacer are formed at both ends of the lower magnetic layer (2) as is well known. (3) and an upper magnetic layer (4) are formed. The thickness of the upper magnetic layer (4) is approximately 1
It is 0 μm. Further, an upper magnetic layer (4) and a lower magnetic layer (
An insulating layer (6) is formed to cover 2). Above each upper magnetic layer (4), a bonding layer (
7), a TiBa protective plate (8) with a thickness of approximately 1 mm is inserted through the
) is fixed.

Thereafter, the part indicated by the broken line in the figure is ground, and a polishing process is performed to form the sliding surface (13) with the magnetic tape into a curved surface. For example, the diameter of the rotating cylinder (9) is 10 mm.
In the case of , the gap depth d is 5 μm, and the sliding surface (13)
The protrusion amount S is set to 20 μm. Therefore, the distance between the gap depth ends of the amphibious head portions (15) (15) is 1
It becomes 0.03 mm.

Incidentally, according to a thin film forming technique such as photolithography, it is possible to form the amphibious head portion (15) at a predetermined position with extremely high precision.

When giving opposite azimuth angles to both head forming parts (14) (14), an inclination angle θ (for example, 3
A lower magnetic layer (2), an upper magnetic layer (4), a coil conductor layer (5), etc. may be formed on the slope.

In this case, it is possible to obtain the effect that the azimuth angle difference between the two head forming portions (14) (14) remains constant regardless of the assembly precision of the substrate (11) to the rotating cylinder.

Note that the slope is not limited to being formed on the entire surface of the substrate (11), but it is also possible to form the slope only in the region where the upper magnetic layer (4) is formed.

FIG. 4 shows an example in which four main head parts (15) are provided on the outer periphery of a disk-shaped substrate (12) having a diameter slightly larger than the diameter of the rotating cylinder (9). In this case, a larger number (for example, 16) of main head parts (15) can be provided, and each main head part (15) can be provided with a different azimuth angle.

According to the above-mentioned thin film magnetic head, each main head section (15) on a common substrate can be formed in a highly accurate shape and in a relative position using thin film forming technology, so that the substrate can be accurately positioned relative to the rotating cylinder. By attaching it, all the main head parts (15) are simultaneously positioned with high precision with respect to the rotating cylinder, making it possible to assemble with higher precision with fewer man-hours than in the past.

The above description of the embodiments is for illustrating the present invention, and should not be construed to limit or reduce the scope of the invention described in the claims.

Further, it goes without saying that the configuration of each part of the present invention is not limited to the above-mentioned embodiments, and various modifications can be made within the technical scope of the claims.

For example, the main head section is not limited to a single channel type main head section (15) with a single magnetic gap section as described above, but also a multi-channel type main head section that has a plurality of head sections arranged at intervals according to the track pitch. It is also possible to arrange them at both ends of the strip-shaped substrate or at the outer periphery of the disk-shaped substrate.

[Brief explanation of drawings]

FIG. 1 is an enlarged cross-sectional view of a thin film magnetic head according to the present invention, FIG. 2 is a perspective view of the magnetic head after the thin film forming process, and FIG. 3 is a perspective view similar to FIG. 2 but with an azimuth angle. , FIG. 4 is a plan view of a magnetic head having a disk-shaped substrate at a stage after the thin film forming process, and FIG. 5 is a sectional view of a conventional thin film magnetic head.

Claims (1)

[Claims] (1) A magnetic head that is to be disposed so as to protrude from the outer peripheral surface of the rotating cylinder (9) by a predetermined distance S,
1) Form a main head part (15) comprising a lower magnetic layer (2), a gap spacer (3) and an upper magnetic layer (4) on top, and In a thin film magnetic head in which a magnetic gap portion is formed in the opposing portions, the substrate (1) has a center of gravity at or near the center of cylinder rotation when attached to a rotating cylinder (9), and the center of gravity is located at or near the center of cylinder rotation. A plurality of head forming portions (14) (14) protruding from the outer peripheral surface of the rotary cylinder (9) by the predetermined distance S are provided around the position at a plurality of locations including at least both ends of the diameter line of the rotary cylinder (9). Equipped with
A thin film magnetic head characterized in that the main head portion (15) is formed on the upper surface of each head forming portion.