JPH08138221A - Rotating magnetic head device - Google Patents

Abstract

(57) [Summary] [Object] To provide a rotary magnetic head device capable of facilitating processing of a scanner such as a rotary drum and reducing crosstalk. [Structure] Bottom surface 11 of upper drum 10 as a rotating drum
a to the surface 30a of the head base 30 via the mounting screw 6
It is fastened and fixed from the side. A thin film magnetic head 32 and a terminal plate 33 are attached to the back surface 30b of the head base 30 with an adhesive, respectively. These thin film magnetic heads 3
The second coil end 32B and the connection terminal of the terminal plate 33 are connected by a short lead wire 34. As a result, the conventional notch groove is not required, the upper drum 10 can be easily processed, and the influence of other magnetic heads is less likely to occur, and crosstalk is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in a magnetic recording / reproducing apparatus such as a VTR (video tape recorder), a data recorder, and a DAT (digital audio tape recorder), and is used for a scanner such as a rotary drum via a head base. The present invention relates to a rotary magnetic head device equipped with a magnetic head such as a thin film magnetic head.

[0002]

2. Description of the Related Art For example, in a VTR, a rotary drum (scanner) having a magnetic head for recording and reproducing a video signal is arranged at a slight inclination from the tape running direction, and an oblique pattern is recorded on the tape while rotating. A helical scan type rotary magnetic head device is generally used. This will be specifically described with reference to FIGS.
Reference numeral 1 denotes a helical scan type rotary magnetic head device. The rotary magnetic head device 1 includes a rotary shaft 2 of a motor 2.
An upper drum (scanner) 10 as a bottomed and cylindrical rotating drum rotatably supported by a via a flange 3.
And a pair of bearings 5 on the rotary shaft 2a of the motor 2.
There is a lower drum 20 as a fixed drum having a bottom and having a cylindrical shape, which is disposed below the upper drum 10 with a predetermined gap therebetween.

The bottom portion 11 of the upper drum 10 is fastened and fixed to the flange 3 through a plurality of mounting screws 4, 4, .... Further, on the outer peripheral edge side of the bottom surface (head base mounting surface) 11a of the bottom portion 11 of the upper drum 10, a surface (scanner mounting surface) 30a of the head base 30 is provided.
By attaching the head base 30 to the mounting screw 6 by
It is fastened and fixed by. A notch groove 12 is formed on the bottom surface 11a of the upper drum 10 on the tip side of the surface 30a of the head base 30. A magnetic recording / reproducing magnetic head 31 is attached by an adhesive to the front end side of the surface 30a of the head base 30 in the cutout groove 12. As a result, as shown in FIGS. 4 and 5A, the mounting surface of the head base 30 on the upper drum 10 and the mounting surface of the magnetic head 31 are flush with each other on the surface 30a, and the magnetic head 31 is Is the outer peripheral surface 1 of the upper drum 10
3 protrudes by a predetermined amount. Furthermore, the head base 30
A terminal plate (relay substrate) 33 for processing and relaying the winding 31a of the magnetic head 31 is attached to the tip end side of the back surface (the surface opposite to the scanner mounting surface) 30b of the above with an adhesive.

The mounting surface of the head base 30 on the upper drum 10 and the mounting surface of the magnetic head 31 are made the same on the surface 30a because the magnetic head 31 in the assembled state (assembled state) of the rotary magnetic head device 1 is the same. This is for minimizing the error in the azimuth angle of the gap G (shown only in FIG. 5B). That is, the azimuth loss L _θ in the magnetic recording of the magnetic head 31 is expressed by the following equation.

[0005]

[Equation 1]

In this equation, W is the track width, λ is the recording wavelength, and θ is the change amount of the azimuth angle.
According to this equation, the larger the track width W and the smaller the recording wavelength λ, the larger the azimuth loss. In the magnetic recording / reproducing apparatus such as the VTR using the rotary magnetic head device 1, the track width is wide and the azimuth loss cannot be ignored. Mounting surface and the surface 3
No change in azimuth angle was made by setting 0a.

If the mounting surface of the head base 30 on the upper drum 1 and the mounting surface of the magnetic head 31 are the same on the surface 30a, one side of the surface 30a of the head base 30 is processed when the head base 30 is processed. There is also a merit that it is necessary to accurately process only the surface of.

Further, with the recent technical progress of high-density magnetic recording, the track width becomes narrower year by year and the track becomes narrower, and the thin film magnetic head as disclosed in Japanese Patent Application No. 5-661055 starts to be put into practical use. (Recently 5-10
A thin film magnetic head with a track width of μm has also been developed). This will be described in detail with reference to FIGS. 6 and 7. Reference numeral 32 is a thin film magnetic head. As shown in FIG. 6A, the thin film magnetic head 32 has a thin film coil 32a embedded in its head body by a predetermined method. The coil terminals 32A and 32B of the thin film coil 32a of the thin film magnetic head 32 are, for example, as shown in FIG.
It is located on one surface side of the head main body (the surface opposite to the surface attached to the head base) and is limited to one direction, and like the winding 31a of the magnetic head 31, it cannot be pulled out in any direction. You can't.

FIG. 7 shows a state in which the thin film magnetic head 32 having the above structure is attached to the surface (scanner mounting surface) 30a of the head base 30 with an adhesive. As with the magnetic head 31, a terminal plate (relay substrate) 33 is attached to the tip end side of the back surface (the surface opposite to the scanner mounting surface) 30b of the head base 30 with an adhesive. Each connection terminal of the terminal plate 33 and each coil terminal 32A, 32B of the thin film coil 32a of the thin film magnetic head 32 are connected by a pair of long lead wires 34, 34.

[0010]

However, in the rotary magnetic head device 1 using the above-mentioned conventional magnetic head 31 or thin film magnetic head 32, as shown in FIG. 4, FIG. 5 (a) or FIG. In order to avoid interference between the heads 31 and 32 and the bottom portion 11 of the upper drum 10, a cutout groove 12 is indispensable on the bottom surface (head base mounting surface) 11a of the upper drum 10, and the cutout groove 12 is required. Processing for producing the upper drum 10 was complicated. Further, as shown in FIG. 5A, the winding 31a of the magnetic head 31 is extended to the terminal plate 33 which is a relay substrate, or, as shown in FIG. 7, each coil terminal of the thin film magnetic head 32 is extended. 32A, 32B
It is necessary to extend the lead wire 34 connecting the connection terminal of the terminal board 33 and the connection terminal of the terminal plate 33 to the back surface 30b side of the head base 30.
It was easy to pick up a signal from another magnetic head (not shown) attached to the bottom portion 11 of the upper drum 10, which was a cause of crosstalk.

Therefore, the present invention provides a rotary magnetic head device capable of facilitating the processing of the scanner and lessening the influence of other magnetic heads to reduce crosstalk. is there.

[0012]

A head base is fastened and fixed to a head base mounting surface of a rotating scanner through a mounting screw, and a magnetic head is protruded from the outer peripheral surface of the scanner by a predetermined amount on the tip side of the head base. In the rotary magnetic head device attached as described above, the magnetic head is attached to the surface of the head base opposite to the scanner attachment surface, and the relay substrate is attached to the surface of the head base opposite to the scanner attachment surface. It is attached.

[0013]

[Function] Since the magnetic head and the relay substrate are attached to the surface of the head base opposite to the scanner mounting surface,
The notch groove, which was indispensable for conventional scanners, is no longer necessary, and the scanner becomes easier to process. Further, since the magnetic head and the relay substrate can be connected as close to each other as possible by a short wiring, it is less likely to be affected by other magnetic heads, crosstalk is reduced, and the characteristics of the magnetic head are improved. Improve further.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to the drawings. The same parts as those of the conventional structure will be described with the same reference numerals.

In FIG. 1, reference numeral 1 denotes a helical scan type rotary magnetic head device, which is an upper drum as a bottomed and cylindrical rotary drum rotatably supported by a rotary shaft 2a of a motor 2 through a flange 3. (Scanner) 10
The lower drum 2 as a bottomed and cylindrical fixed drum which is arranged below the upper drum 10 at a predetermined distance via a pair of bearings 5 and 5 on the rotary shaft 2a of the motor 2.
0, the bottom portion 11 of the upper drum 10 is fastened and fixed to the flange 3 through a plurality of mounting screws 4, 4, ..., The bottom surface of the bottom portion 11 of the upper drum 10 (head base). The surface (scanner mounting surface) 30a of the head base 30 is provided on the outer peripheral side of the mounting surface 11a.
A point where the head base 30 is fastened and fixed by a mounting screw 6 against a.
The point that the reproducible thin film magnetic head 32 is attached to the head base 30 with an adhesive is the same as the conventional configuration.

Here, as shown in FIGS. 2 and 3, a taper surface 30c is provided on the front end side of the surface 30a of the head base 30.
Has been formed. The thin film magnetic head 32 is attached to the tip side of the back surface (the surface opposite to the scanner mounting surface) 30b of the head base 30 with an adhesive, and the back surface of the head base 30 (the scanner mounting surface). On the side opposite to the surface 30b) of the screw insertion hole 30d,
A terminal board (relay board) 33 is attached by an adhesive. As a result, the tip end side of the thin film magnetic head 32 projects from the outer peripheral surface 13 of the upper drum 10 by a predetermined amount. Further, each coil terminal 3 of the thin film coil 32a of the thin film magnetic head 32 is
2A, 32B and each connection terminal of the terminal plate 33 adjacent to,
It is connected by a pair of lead wires 34, 34.

According to the rotary magnetic head device 1 of the above embodiment, as shown in FIGS. 2 and 3, the thin film magnetic head 32 and the terminal plate 33 are provided on the back surface 3 which is the same surface of the head base 30.
0b is attached by an adhesive respectively, so that the distance from the thin film magnetic head 32 to the terminal plate 33 can be shorter and shorter than the conventional one, and the coil terminals 32A and 32B of the thin film coil 32a of the thin film magnetic head 32 can be connected. Connect each connection terminal of the adjacent terminal plates 33 to a pair of shorter lead wires 3
It can be connected by 4, 34. As a result, the thin film magnetic head 32 causes the bottom surface 11 of the bottom portion 11 of the upper drum 10 to move.
It is possible to make it less likely to be affected by another magnetic head (not shown) attached to a, reduce crosstalk, and further improve the magnetic head characteristics.

Further, by attaching the thin film magnetic head 32 to the back surface 30b of the head base 30, the upper drum 1
Bottom surface 11a which is the head base mounting surface of the bottom portion 11 of 0
Then, the thin film magnetic head base 32 and the bottom portion 1 of the upper drum 10
Since there is no interference with 1, the notch groove 12 as in the conventional
Becomes unnecessary. Therefore, the shape of the bottom portion 11 of the upper drum 10 on which the magnetic head such as the thin film magnetic head 32 is arranged can be simplified. In addition, when the upper drum 10 is manufactured, the machining process of the notch groove 12 is eliminated, which facilitates the machining. In recent years, in VTRs, data recorders, and the like, multi-heading has been further advanced, and there are cases where about 20 magnetic heads are arranged on one drum, so this processing step reduction is significant. In the near future, when a multi-track magnetic head having a plurality of gaps in one magnetic head is formed, the structure of this embodiment is essential for attaching the magnetic head to the head base.

Although the thin film magnetic head is attached to the back surface of the head base in the above embodiment,
Even if a normal type magnetic head and a terminal plate, which are not of thin film type, are attached to the back surface of the head base, the same effect as in the above embodiment can be obtained. Further, in the above-described embodiment, the upper drum of the type in which the upper drum rotates and the lower drum is fixed has been described as the scanner, but the upper and lower drums are fixed and there is a rotating disc of a type that rotates between them. It is needless to say that the above-mentioned embodiment can be applied to an apparatus using the scanner as a scanner. Further, the terminal plate on the head base may be eliminated and the magnetic head may be directly contacted.

[0020]

As described above, according to the present invention, the head base is fastened and fixed to the head base mounting surface of the rotating scanner through the mounting screws, and the magnetic head is provided on the tip side of the head base. In a rotary magnetic head device attached so as to project from the outer peripheral surface of the head by a predetermined amount, the magnetic head is attached to a surface of the head base opposite to the scanner mounting surface, and the head base is opposite to the scanner mounting surface. Since the relay substrate is attached to the surface of the above, the notch groove, which was indispensable in the conventional scanner, becomes unnecessary, and the processing of the scanner can be facilitated accordingly. Further, since the magnetic head and the relay substrate can be connected by a short connection, it is possible to prevent the magnetic head from being affected by other magnetic heads. As a result, crosstalk can be reduced and the characteristics of the magnetic head can be further improved.

[Brief description of drawings]

FIG. 1 is a sectional view of a rotary magnetic head device showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a main part of the rotary magnetic head device.

FIG. 3A is an enlarged rear view of a head base used in the rotary magnetic head device, and FIG. 3B is an enlarged side view of the head base.

FIG. 4 is a cross-sectional view of a conventional rotary magnetic head device.

5A is an enlarged cross-sectional view of a main part of the conventional rotary magnetic head device, and FIG. 5B is an enlarged front view of the main part.

FIG. 6A is a perspective view showing a state where a thin film coil of a thin film magnetic head is embedded, and FIG. 6B is a perspective view in which the head is laid down.

FIG. 7 is a side view showing a state in which the thin film magnetic head is attached to a head base.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Rotating magnetic head device 6 ... Mounting screw 10 ... Upper drum (scanner) 11a ... Bottom surface (head base mounting surface) 13 ... Outer peripheral surface 30 ... Head base 30a ... Front surface (scanner mounting surface) 30b ... Back surface (scanner mounting surface and 32 ... Thin film magnetic head 33 ... Terminal plate (relay board) 34 ... Lead wire

Claims (2)

[Claims] 1. A head base is fastened and fixed to a head base mounting surface of a rotating scanner through a mounting screw, and a magnetic head is attached to a tip end side of the head base so as to protrude from an outer peripheral surface of the scanner by a predetermined amount. In the attached rotary magnetic head device, the magnetic head is attached to the surface of the head base opposite to the scanner attachment surface, and the relay substrate is attached to the surface of the head base opposite to the scanner attachment surface. Characteristic rotary magnetic head device. 2. The rotary magnetic head device according to claim 1, wherein a thin film magnetic head is used as the magnetic head, and the thin film magnetic head and the relay substrate are connected by a lead wire. .