JPH02161605A - Rotary magnetic head device - Google Patents

Abstract

PURPOSE:To eliminate the need for mechanical adjustment for the position accuracy of individual head elements by forming plural thin-film magnetic head elements to the peripheral part of a circular substrate. CONSTITUTION:A rotary magnetic head unit 7 is attachably and detachably fixed by a suitable fixing device 6 to a rotary drum 3. This rotary magnetic head unit 7 is electrically connected to at least a part of recording/reproducing circuits disposed on the inner side of the rotary drum 5, for example, an electronic circuit unit 8 including a recording amplifier, reproducing amplifier, etc. The electronic circuit unit 8 is connected via a rotary transformer to an external circuit. The rotary magnetic head unit 7 is formed with the plural thin-film magnetic head elements 12 in the peripheral part on the circular substrate 11 consisting of a ceramics substrate, glass substrate or resin substrate. The need for the laborious control and adjustment for determining the individual positions of the respective head elements is eliminated in this way.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a rotary magnetic head device used in a rotary scanning magnetic recording/reproducing device such as a helical scan VTR, and particularly relates to a rotary magnetic head device used in a rotary scanning magnetic recording/reproducing device such as a helical scan VTR. The present invention relates to a rotating magnetic head device suitable for a case where a large number of heads are used.

(Prior Art) In rotary scanning magnetic recording and reproducing apparatuses such as helical scan VTRs, a rotary magnetic head device is used as a recording/reproducing head. Furthermore, recently, a rotating magnetic head device is also used as an erasing head to facilitate editing.

Figure 4 shows a head assembly of a conventional rotary magnetic head device, in which a head chip 4 is made by machining from a metal magnetic material such as ferrite or sendust.
A so-called bulk type head having a coil 42 wound around the head is fixed to a base 43 with an adhesive. To attach the head, the base 43 is screwed to a rotating drum or a rotating disk (not shown) using holes 44. When mounting the head by screwing the base 43, it is necessary to strictly control and adjust the angle, head height, protrusion amount, tilt, azimuth angle, etc. of the head mounting.

That is, in the conventional rotary head device, firstly, the head chip 41, the head mounting is based on the base 43, and the mounting surface and position of the rotating drum (rotating disk) are machined with machining accuracy;
Second, the head is attached to the base 43 by the Herad tip 4]-
Tori 4 = f It passion and rotating drum (rotating disk)
When attaching the head to the base 43, strict control and adjustment of each component was essential in order to achieve sufficiently high precision.

This problem becomes particularly serious when the recording signal becomes wider in band and frequency as in digital VTRs and high-definition television VTRs, which are currently being actively developed. In other words, when widening the band and increasing the frequency of the recording signal, there is a limit to the recording capacity per head due to the limitations of the electromagnetic circuit, so the number of heads must be dramatically increased compared to current VTRs. Must be. Also,
In order to secure the recording/playback time necessary for practical use, it is necessary to further narrow the track pitch of the tape pattern, so the precision of mounting each head element is extremely difficult.

(Problem that the invention seeks to solve 1.) Conventional rotating head devices, such as dual
Digital VTRs and high-definition VTRs that record high-frequency signals
0, requires a large number of head elements, and has a strong l.
In the case of rotary scanning magnetic recording and reproducing devices that require a rack pitch, it is necessary to strictly control and adjust the positional accuracy of individual head elements, which not only reduces the productivity of the recording and reproducing device, but also requires a great deal of head replacement. The problem of requiring a lot of effort and time was solved.

The present invention solves these problems17 and eliminates the need for mechanical adjustment of the positional accuracy of individual head elements.1. The object of the present invention is to provide a rotary magnetic head device that has the following characteristics.

[Structure of the Invention] (Means for Solving the Problems) A rotary magnetic head device according to the present invention is characterized in that a plurality of thin film magnetic Radiation elements are formed at the peripheral portion of a circular substrate. In this case, the circular substrate has approximately the same diameter as a rotating body such as a rotating drum or a rotating disk around which the magnetic tape is wound, and is fixed to these rotating bodies.

(Function) In the present invention, since a plurality of magnetic head elements are composed of thin film magnetic head elements and are integrally formed on the same circular substrate, it is not only easy to manufacture the head elements, but also individual magnetic head elements. There is no need to mechanically adjust the positional accuracy of the head element. In other words, since the plurality of thin film magnetic head elements already have sufficiently high positional accuracy when they are formed on the substrate, only the mounting accuracy needs to be sufficiently high when fixing the circular substrate to the rotating drum. .

(Example) Hereinafter, the present invention will be described in detail with reference to the drawings.

FIG. 1 is a sectional view showing a schematic configuration of a scanner section in a rotary scanning magnetic recording/reproducing apparatus including a rotary magnetic head device according to an embodiment of the present invention.

In the figure, a lower fixed drum 2 is fixed to the base of a rotating device type magnetic recording and reproducing apparatus such as a helical scan VTR, and an upper rotating drum 3 is rotatably provided on the upper part of the lower fixed drum 2. ing. The rotating shaft 4 of the two-part rotating drum 3 is directly connected to a motor 5 installed below the lower fixed drum 2. The motor 5 is shown in 1. Power is supplied from outside via a rotary transformer.

A rotary magnetic held unit 7 according to the invention is removably fixed to the rotary drum 3 by means of a suitable fixing device 6. This rotating magnetic field unit 7 is electrically connected to an electronic circuit unit 8 that includes at least a part of a recording/reproducing circuit (for example, a recording amplifier, a reproduction amplifier, etc.) arranged inside the rotating drum 5. ing. Further, the electronic circuit UniSoto 8 is connected to an external circuit via a rotary transformer (not shown).

FIG. 2 is a plan view schematically showing the rotating magnetic head unit 7 in FIG. is formed. For thin film magnetism, the number of groove resistors 12 is eight in the figure, but a larger number (for example, about 10 to 20) may be formed on the same substrate 11. A bonding pad 13 is connected, and the pad 1-3 is connected to the electronic circuit unit 8 via a bonding wire 14, as shown in FIG. As shown in FIG. 1, the magnetic head element 12 comes into contact 17 with the running magnetic tape 9, which is wound diagonally around the circumferential surface of the upper rotating drum 3, and performs recording/reproduction. Note that a part of the magnetic head element 12 may be used as an erasing head.

FIG. 3(a) (lr) is a plan view showing an enlarged part of the rotating magnetic head unit 7 and a sectional view taken along the line A-A. Thin film magnetic head element] 2 has a lower conductor 2 attached to a magnetic core scrap 21 formed partially along the periphery of a circular substrate 11.
2 and a part conductor 23 are wound. Insulating layers 24 and 25 are formed between the magnetic core layer 21 and the lower conductor 22 and upper conductor 23, respectively. Furthermore, both ends of the lower conductor 22 are connected to bonding pads 13.
It extends to the position of These magnetic core 21, lower and upper conductor layers 22, 23, and insulating layers 24, 25 are formed by vapor deposition,
It is created by a known thin film formation process that mainly includes film formation by sputtering or CVD, and patterning by photoetching or the like.

At the center of the tip of the magnetic core 21 facing the peripheral edge of the circular substrate 11, a magnetic gap 26 is formed perpendicular to the surface of the substrate 1→ or at an inclination angle corresponding to a predetermined azimuth angle 6. This magnetic gap 26 is formed, for example, by machining after forming a thin film.

Although only one thin film magnetic head element 12 is shown in FIG. 3, other thin film magnetic head elements are simultaneously formed on the circular substrate 1 by a similar thin film forming process. In this case, the positional accuracy of each thin film magnetic head element 12 with respect to the circular substrate 1 is determined by the mask pattern used in the thin film forming process, and is extremely accurate. This eliminates the need for strict name management and adjustment for the positional accuracy of each magnetic head element, which is required in the prior art in which a bulk head is used as a plurality of magnetic head elements.

It should be noted that the present invention is not limited to the second embodiment; for example, the present invention relates to a thin film magnetic head element.

Ring-type heads are shown in 12 and 17, but especially in the case of read-only heads, so-called MR heads that use magnetoresistive elements are used.
A head may be used, or a mixture of these may be formed on the same substrate. In addition, in the example, a circular substrate on which a thin film magnetic head element was formed was attached to a rotating drum.
In the case of a scanner with a structure in which the drum does not rotate, a circular substrate may be attached to the rotating disk. In addition, the present invention can be implemented with various modifications without departing from the scope.

[Effects of the Invention] According to the present invention, the individual positions of each head element can be determined by forming a plurality of magnetic head elements constituting a rotating magnetic head device on one circular substrate. This eliminates the need for complicated management and coordination.

Therefore, especially in digital VTRs and high-definition television VTRs, which are equipped with an extremely large number of head elements for recording and reproducing broadband and high-frequency signals, and whose track pitch is even narrower than current VTRs, manufacturing and The labor and time required for assembly can be significantly reduced,
In addition, for head replacement, which is often done especially in professional use, by replacing the entire rotating magnetic head unit consisting of a circular substrate and multiple thin-film magnetic head elements,
This can be done efficiently in an extremely short time.

[Brief explanation of the drawing]

FIG. 14 is a diagram showing the configuration of a scanner section of a rotary scanning magnetic recording/reproducing apparatus using a rotary magnetic head device according to an embodiment of the present invention, and FIG. 2 is a plan view of the rotary magnetic head unit in FIG. 1. , FIGS. 3(a) and 3(b) are a plan view and an A-A sectional view showing an enlarged part of FIG. 1, and FIG. 4 is a perspective view for explaining the configuration of a conventional rotary magnetic head device. It is. DESCRIPTION OF SYMBOLS 1... Base, 2... Lower fixed drum, 3... Upper rotating drum, 4... Rotating shaft, 5... Motor, 6...
... Fixing device, 7... Rotating magnetic head unit, 8.
...Electronic circuit unit, 9...Magnetic tape, 11...
・Circular substrate, 12... Thin film magnetic head element, 13...
- Bonding ballad, 14... Bonding wire,... Magnetic core layer, 2... Lower conductor, 3... Upper conductor, 24° 5... Insulating layer, 26... Magnetic gap.

Claims (2)

[Claims] (1) A rotating magnetic head device characterized in that a plurality of thin film magnetic head elements are formed on the periphery of a circular substrate. (2) A plurality of thin film magnetic head elements are formed on the periphery of a circular substrate having approximately the same diameter as the rotating body around which the magnetic tape is wound;
A rotating magnetic head device characterized in that the circular substrate is fixed to the rotating body.