JP3097972B2 - Rotating head device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head device for a helical scan type magnetic recording / reproducing apparatus, and more particularly, to a rotary head device having a small diameter and a thin shape in which a rotary transformer is arranged in a rotary drum.

[0002]

2. Description of the Related Art As a conventional rotary head device having a small diameter and a small thickness, for example, as described in Japanese Patent Application Laid-Open No. 2-132602, a brushless motor is provided in a fixed drum with a shaft fixed and rotating. There is a rotary drum in which a flat opposed rotary transformer is incorporated.

In general, in a rotary head device having a small diameter and a small thickness, when a rotary transformer is incorporated in a rotary drum, the rotary transformer is required to have a sufficient space for disposing coils of the rotary transformer in order to cope with multi-channels. It is necessary to ensure the maximum outside diameter of

Therefore, in the above-mentioned proposed example, the rotor of the rotary transformer is adhered to a fixing member, and the fixing member is fixed to the rotating drum with a screw so that the rotating drum can be detachably attached. Is fixed to the rotating drum. At this time, a notch for engaging with the head of the screw is provided on the outer periphery of the fixing member, and the head of the screw is provided on the outer periphery of the rotor of the rotary transformer and the inner periphery of the rotating drum. By forming notches for avoiding the portions, the outer diameter of the rotary transformer can be made substantially the same as the inner diameter of the rotary drum, and the outer diameter of the rotary transformer can be maximized.

[0005]

In general, in a rotary head device having a small diameter and a small thickness, when a rotary transformer is built in a rotary drum, it is also important to secure the maximum outer diameter of the rotary transformer as described above. However, it is almost as important to connect the magnetic head to the rotary transformer and to secure a space for the connection.

That is, the connection between the magnetic head and the rotary transformer must be reliable and simple so that the magnetic head and the rotary transformer can be easily replaced for maintenance. In addition, if the outer diameter of the rotary transformer is maximized, it is not possible to secure a space for such a connection in the same plane as the rotary transformer, and therefore, there is a problem of where to secure the space. .

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems of the prior art, and to easily and simply connect the magnetic head and the rotary transformer by a one-way insertion operation while ensuring the maximum outer diameter of the rotary transformer. It is an object of the present invention to provide a rotary head device that can surely perform the replacement, easily replace a magnetic head and a rotary transformer for maintenance, and realize a small-diameter and thinner.

[0008]

SUMMARY OF THE INVENTION The object of the present invention is to provide a fixed drum having a built-in brushless motor, a rotary drum having a plurality of magnetic heads, having a rotary transformer built therein, and being rotationally driven via a disk by the brushless motor. ,
In the rotary head device consisting of, to fix the rotary transformer rotor, a fixing member screwed to the rotary drum, an opening for screwing to the rotary drum, to connect the rotary transformer rotor and the magnetic head,
This is achieved by providing a plug which is a fitting portion with a socket electrically connected to a magnetic head mounted on a rotating drum, and a fitting portion for positioning a rotary trans rotor.

[0009]

According to the present invention, the fixing member is provided with a plug electrically connected to the rotary transformer rotor, and the rotary drum is provided with a socket electrically connected to the magnetic head. By attaching the member to the rotating drum, connection between the rotary transformer rotor and the magnetic head can be performed.

Further, according to the present invention, the stepped hole provided in the rotating drum and the stopper provided in the socket can prevent the socket from falling off due to the insertion force of the plug, and can perform reliable connection. Furthermore, according to the present invention,
Since the fixing member is provided with the fitting portion for positioning the rotary transformer rotor, the rotary transformer rotor can be easily and accurately mounted.

[0011]

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a predetermined section of a rotary head device as one embodiment of the present invention.

In FIG. 1, 1 is a fixed drum, 2 is a fixed shaft, 3 is a disk, 4 is a rotating drum, 5 is a socket, 6
Is a rotary transformer rotor, 7 is a rotary transformer stator, 8 is a fixed member, 9 is a holding member, 10 is a brushless motor, 11 is a screw, 13 is a ball bearing, 14 is a screw,
It is.

As shown in FIG. 1, the fixed shaft 2 is fixed vertically to the fixed drum 1, and the coil side of the brushless motor 10 is adhered and fixed to the inner lower surface of the fixed drum 1 concentrically with the fixed shaft 2. The magnet side of the brushless motor 10 is adhered and fixed to the disk 3 and two ball bearings 13.
Is fixed. The disc 3 is mounted on the ball bearing 13.
And is rotatably attached to the fixed shaft 2 via.

On the other hand, the socket 5 is fitted into a stepped hole 4b (see FIG. 2 described later) provided in the rotary drum 4 and is fixed by bonding. Further, a magnetic head (not shown) is also fixed to the rotating drum 4. The socket 5 and the magnetic head are electrically connected. The rotating drum 4 to which the socket 5 and the magnetic head are attached is fastened and fixed to the disk 3 by screws 14.

The rotary transformer rotor 6 is positioned and fixed to the fixing member 8 by a fitting portion 8b (see FIG. 2 described later). The coil of the rotary transformer rotor 6 and the plug 8c of the fixing member 8 are electrically connected. The fixing member 8 is fixed to the rotating drum 4 by a screw 11.
Fixed to At this time, the socket 5 attached to the rotating drum 4 and the plug 8c of the fixing member 8 are fitted.
Thus, the connection between the rotary transformer rotor 6 and the magnetic head is performed.

The rotary transformer stator 7 is fixed to the fixed shaft 2 via the holding member 9 by being bonded and fixed to the holding member 9. As a result, the rotary transformer stator 7 faces the rotary transformer rotor 6 via a very small gap.

Next, with reference to FIGS. 2, 3, 4, 5, and 6, the main components of this embodiment will be described more specifically. FIG. 2 is an exploded perspective view showing a main part in FIG. In FIG. 2, reference numeral 12 denotes a magnetic head.

As shown in FIG. 2, the fixing member 8 includes a bonding surface for bonding the rotary transformer rotor 6, a cylindrical fitting portion 8b for positioning the rotary transformer rotor 6, and
A plug portion 8c electrically connected to the rotary transformer rotor 6 (the connection state will be described with reference to FIG. 4), and an opening 8a for screw-fixing the fixing member 8 to the rotary drum 4.
And consisting of

FIG. 3 is an enlarged cross-sectional view of a main part of the fixing member of FIG. The rotary transformer rotor 6 is positioned by the fitting portion 8b of the fixing member 8, and is fixed by bonding. At this time, as shown in FIG. 3, a concave portion 8e is provided on the bonding surface of the fixing member 8, and a relief 8f and a chamfer 8g are provided on the fitting portion 8b, thereby suppressing unevenness in the thickness of the bonding layer while maintaining the bonding strength. It is possible to perform bonding with higher precision.

Next, a method of connecting the rotary transformer rotor 6 and the fixing member 8 will be described. 4A and 4B are a sectional view and a plan view showing a fixing member to which the rotary transformer rotor of FIG. 2 is adhered, wherein FIG. 4A is a sectional view and FIG. 4B is a plan view. In FIG. 4, reference numeral 8 d denotes a soldered portion provided on the fixing member 8, and 6 a denotes a hole for drawing out a lead wire of the rotary transformer rotor 6.

As shown in FIG. 4, the lead wire drawn out of the hole 6a is soldered at a soldered portion 8d, thereby connecting the rotary transformer rotor 6 and the plug portion 8c. Of course, the dotted line between the soldered portion 8d and the plug 8c is a conductor.

On the other hand, in FIG.
Four stepped holes 4b are provided such that the downward direction of the rotary drum is a hole having a small opening area. The socket 5 is formed so as to fit into the stepped hole 4b, and is attached and fixed in the direction of the arrow. The rotating drum 4 has 2
Two holes 4a are provided. The magnetic head 12 is fixed to the lower surface of the rotary head 4 by screws so as to cover the center of the hole 4a. In addition, the rotating drum 4 shown in FIG.
The hole for fitting with the head of the screw 14 is omitted in the drawing.

Next, a method of connecting the socket 5 and the magnetic head 12 will be described. 5A and 5B are a side view and a plan view showing a rotary drum to which the socket and the magnetic head of FIG. 2 are fixed, where FIG. 5A is a side view and FIG. 5B is a plan view.

In FIG. 5, reference numeral 5a denotes a soldered portion provided on the socket 5. The lead wire of the magnetic head 12
By being soldered in the soldering portion 5a,
The connection between the magnetic head 12 and the socket 5 is performed. Here, the structure of the socket 5 will be described.

FIG. 6 is a sectional view showing a section of the socket of FIG. In FIG. 6, 5d is a retaining portion, 5b is a fitting portion for positioning the plug portion 8c, and 5c is a plug portion 8
c is a metal terminal to be inserted, and the metal terminal 5c is electrically coupled to the soldering portion 5a.

The fixing member 8 having the rotary transformer rotor 6 bonded thereto and the rotary drum 4 having the socket 5 and the magnetic head 12 fixed thereto, which are constructed and connected as described above,
Are combined as follows.

That is, as shown in FIG. 2, the fixing member 8 to which the rotary transformer rotor 6 is adhered is
After being mounted so that the plug portion 8c fits into the socket 5, the screw portion is screwed to the rotary drum 4 with the screw 11. Thereby, the rotary transformer 6 and the magnetic head 1
2 is made. At this time, since the rotary drum 4 is provided with the above-described hole 4a, the soldering portion 8 is provided.
e does not come into contact with the rotating drum 4.

[0028]

According to the present embodiment, in the rotary head device in which the rotary transformer is disposed in the rotary drum, the positioning of the rotary transformer and the connection with the magnetic head can be easily performed by the fixing member on the rotary transformer rotor side. In addition, since the connection between the rotary transformer and the magnetic head is performed by using the thickness of the rotary drum, the effect of reducing the thickness of the rotary drum is great.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing a predetermined cross section of a rotary head device as one embodiment of the present invention.

FIG. 2 is an exploded perspective view showing a main part in FIG. 1;

FIG. 3 is an enlarged cross-sectional view showing a main part cross-section of the fixing member of FIG. 2;

FIG. 4 is a cross-sectional view and a plan view showing a fixing member to which the rotary transformer rotor of FIG. 2 is adhered.

FIG. 5 is a side view and a plan view showing a rotary drum to which the socket and the magnetic head of FIG. 2 are fixed.

FIG. 6 is a sectional view showing a section of the socket of FIG. 5;

[Explanation of symbols]

1 ... fixed drum, 2 ... fixed shaft, 3 ... disk, 4 ...
Rotary drum, 5: Socket, 6: Rotary transformer rotor, 7: Rotary transformer stator, 8: Fixing member, 8c: Plug portion, 9: Holding member, 10 ... Brushless motor, 11 ... screw, 12 ... magnetic head.

────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshizaemon Okazaki 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Pref. JP-A-60-52901 (JP, A) JP-A-62-195209 (JP, U) JP-A-61-92026 (JP, U) JP-A-59-111015 (JP, U) (58) (Int.Cl. ⁷ , DB name) G11B 5/02 G11B 5/53

Claims (4)

(57) [Claims] 1. A fixed drum (1), a fixed shaft (2) which is press-fitted and fixed to the fixed drum (1), and the fixed shaft (2) is rotatable about the fixed shaft (2). A disk (3) to be mounted, a brushless motor (10) arranged inside the fixed drum (1) for rotating the disk (3), and a plurality of magnetic heads (12)
A rotating drum (4) fixed on the disk (3); and a rotor (6) and a stator (7) disposed inside the rotating drum (4). A rotary transformer for transmitting and receiving signals; a holding member (9) holding the stator (7) and fixed to the fixed shaft (2); and a rotating drum (4) fixing the rotor (6). And a fixing member (8) screwed to the rotating head device, wherein a socket (5) is attached to the rotating drum (4) and one end thereof is electrically connected to the magnetic head (12). A metal terminal (8c) is provided on the fixing member (8),
One end of the metal terminal (8c) is electrically connected to the fixed rotor (6), and the other end of the metal terminal (8c) is connected to the socket by screwing the fixing member (8) to the rotating drum (4). The magnetic head (12) can be connected to the rotor (6) by being fitted to the fitting portion (5c) which is the other end of (5), and the magnetic head (12) and the stator (7) can be connected.
A rotary head device capable of exchanging signals with the rotary head device. 2. The rotary head device according to claim 1, wherein the socket (5) is inserted into a hole of the rotary drum (4) from inside the rotary drum (4) to outside. When attached to the rotating drum (4), the hole of the rotating drum (4) is different from the stepped hole (4b) in which the opening area on the outer side of the rotating drum (4) is smaller than the opening area on the inner side. In addition, the socket (5) has a shape having a stopper so as to fit into the stepped hole (4b), and the socket (5) falls out to the outside of the rotary drum (4). A rotary head device characterized in that the rotation is prevented. 3. The rotary head device according to claim 1, wherein the fixed member (8) is connected to the rotor (6).
A rotary head device comprising a cylindrical fitting portion (8b) for positioning the rotary head. 4. The rotary head device according to claim 1, 2 or 3, wherein the rotor (6) is fixed to the fixing member (8) by bonding.
A rotary head device characterized in that a concave portion (8e) is provided on the bonding surface of (1).