JPS63201902A - rotating head device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a rotary head device in a magnetic recording/reproducing device.

[Conventional technology]

Conventionally, this type of rotary head device has been constructed as shown in FIG. That is, the rotary shaft 1 shrink-fitted into the multistage cylindrical disk 2 is preloaded by the disk 2 and the preload boss 1G, and the ball bearings 20a and 20bK fixed to the fixed cylinder 4 are fitted, and the disk 2 rotates. It is rotationally driven by the driving torque of a rotor magnet unit 9 fixed to the lower end of the shaft 1. Further, a rotating cylinder 3 to which a magnetic head 5 is attached is fitted into the outer diameter portion of the small diameter side of the disk 2 and is in contact with the middle end surface of the disk 2. A rotating side rotary transformer 6 is attached to the lower end surface of the disk 2, and this rotating side rotary transformer 6 faces the fixed side rotary transformer 8 fixed inside the fixed cylinder 4 with a constant gap maintained therebetween. It constitutes an inductance coupling. Further, the rotating side rotary transformer 6 is electrically coupled to the terminal 7 via the head relay terminal 21.

[Problem that the invention seeks to solve]

In such a conventional configuration, only the rotating cylinder 3 and the rotary transformer 6 can be attached to the disk 2, and the rotor magnet unit 9 is attached to the rotating shaft 111C after the bearing preloading process, making the manufacturing process complicated and complicated. There was a problem that it was redundant and could not be manufactured at a low cost.

Further, as shown in FIG. 1, since the disk 2 and the rotor magnet unit 9 are disposed apart from each other, it is very difficult to reduce the thickness of the disk 2 and the rotor magnet unit 9, making it difficult to put it into practical use as a rotary head device for an ultra-small video tape recorder.

An object of the present invention is to provide a rotary head device that can simplify the manufacturing process and can be made thinner.

[Means for solving problems]

The above object is to provide a rotary disk rotatably supported by a fixed main shaft with a rotating side of a cylindrical rotary transformer disposed coaxially with the fixed main shaft, and a fixed cylinder with a fixed side of the cylindrical rotary transformer coaxial with the fixed main shaft. A radially protruding terminal portion is provided at the base end on the rotation side of the cylindrical rotary transformer, and a cylindrical rotor (IJ) is provided on the fixed cylinder side surface of the rotary disk on the rotation side of the lance. A first recess for accommodating the base end portion, a second recess connected to the first recess for accommodating the terminal portion, and a terminal pin on the rotation side of the cylindrical rotary transformer so as to extend to the outside of the rotating disk. This is achieved by providing a third recess that extends to the outermost periphery of the rotating disk and is connected to the second recess.

[Effect]

A rotating side of a cylindrical rotary transformer is disposed coaxially with the fixed main shaft on a rotating disk rotatably supported by a fixed main shaft, and a fixed side of the cylindrical rotary transformer is disposed coaxially with the fixed main shaft on the fixed cylinder. Further, a terminal portion protruding in the radial direction is provided at the base end portion on the rotation side of the cylindrical rotary transformer.

a first recess for accommodating the base end portion on the rotation side of the cylindrical rotary transformer on the fixed cylinder side surface of the rotating disk;
A second recess connected to the first recess and a recess connected to the second recess extending to the outermost periphery of the rotating disk are provided to accommodate the terminal portion, so that the rotation side of the cylindrical rotary transformer is Since the terminal pin can be extended to the outside of the rotating disk, this method can be adopted and the rotating head device can be downsized.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 and 2.

A multi-stage coaxial cylindrical disk 2 (hereinafter referred to as a rotating disk) is provided with a bearing function and coaxiality. In other words, a hydrodynamic bearing is constituted by the oil sealed in the clearance formed between the outer diameter portion of the fixed main shaft 1 weighed with phosphorus in the fixed cylinder 4 and the bearing portion of the rotary disk 2. Further, a rotating side 6 of the cylindrical rotary transformer is fixed to the rotating disk 2, and faces the fixed side 8 of the cylindrical rotary transformer with a constant gap therebetween to form an inductive coupling. Further, a rotary magnet unit 9 is attached to the lower end surface of the rotating disk 2, and the rotating disk 2 is rotated by a driving torque given by a stator unit 22 fixed to the fixed cylinder 4. A rotating cylinder 3 in which a magnetic head 5 is disposed is attached to a rotating disk 2.

Next, the structure of the rotating disk 2 and the rotating side 6 of the rotary transformer will be explained in detail with reference to FIG.

A terminal member 18 having a terminal portion 7 projecting in the radial direction is adhesively fixed to the rotation side 6 of the rotary transformer. Here, four notches A1 # A2 e A5 * A4 are formed around the terminal member 18 to expose the core on the rotation side 6 of the rotary transformer.

A first recess 11 is provided on the surface of the rotating disk 2 on the fixed cylinder 4 side, and accommodates a base end portion coaxial with the bearing portion 15 of the first disk 2 and surrounded by the terminal member 18 on the rotary transformer rotation side 6. and the first one to accommodate each terminal section 7.
A second recess 12 connected to the recess 11 of the terminal section 7, and a third recess 13 connected to the second recess 12 extending to the outermost periphery of the rotating disk i are provided. can be extended to the outside of the disk 2.

Moreover, such a first . Second. The third recesses 11 , 12 , 15 can be formed by plastic working such as cold forging. To assemble the rotating disk 2 and the rotary transformer rotating side 6, connect the base end of the terminal member 180 to the first. Second. The core surface B1*B2mB5*B4 inserted into the third recess 11°12.15 and exposed at the front Al #A2 #A3 #A4 and the inner circumferential surface q1°C2*C5v C4 of the first recess 11 are each fixed with adhesive.

The rotor magnet unit 9 is attached to the lower surface of the rotating disk 2 assembled in this way, and the rotary transformer rotating side 6 housed inside the rotating disk 2
The terminal pin 17 extending from the rotor magnet unit 9 does not interfere with the rotor magnet unit 9 because it is accommodated in the third recess 13 .

In this way, in the above embodiment, the rotary transformer rotation side 6
Since the zero base end portion is attached to the first recess 11 instead of to the lower surface of the rotating disk 2, the rotor magnet unit 9 can be attached to the lower surface of the rotating disk 2 at the same time, thereby simplifying the manufacturing process. Furthermore, when the rotary transformer rotating side 6 is attached to the rotating disk 2, the position in the circumferential direction is determined by coupling the terminal portion 7 to the second recess 12, so that workability is also good.

〔Effect of the invention〕

As described above, the rotating head device of the present invention is configured such that a bearing function is added to the rotating disk, and the rotating side of the cylindrical rotary transformer is attached coaxially with the bearing part, so that the rotating cylinder and the rotor magnet unit are attached to the rotating disk at the same time. Since it is constructed so that it can be attached, it is possible to achieve a reduction in thickness and to simplify the manufacturing process, making it possible to supply a high-performance rotary head device at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of an embodiment of a rotating head device of the present invention;
FIG. 2 is an exploded perspective view of the main part of FIG. 1, and FIG. 3 is a sectional view of a conventional rotary head device. 1... Main shaft, 2... Rotating disk, 6... Rotating cylinder, 4... Fixed cylinder, 5... Magnetic head,
6. ,, Rotary transformer rotating side, 7... Terminal part, 8-... Rotary transformer fixed side, 9... Rotor magnet 11-... First recessed part, 12... Second recessed part, 15...- Third recess, 17--terminal pin,
18--Terminal member.

Claims (1)

[Claims] A rotating side of a cylindrical rotary transformer is arranged coaxially with the fixed main shaft on a rotating disk rotatably supported by a fixed main shaft, and a fixed side of the cylindrical rotary transformer is arranged on a fixed cylinder coaxially with the fixed main shaft. A terminal portion protruding in the radial direction is provided at the base end portion of the rotation side of the cylindrical rotary transformer, and the base end portion of the rotation side of the cylindrical rotary transformer is provided on the surface of the fixed cylinder side of the rotary disk. a first recess for accommodating the terminal portion; a first recess for accommodating the terminal portion;
a second recess connected to the recess of the cylindrical rotary transformer, and a third recess connected to the second recess extending to the outermost periphery of the rotary disk so as to extend the terminal pin on the rotating side of the cylindrical rotary transformer to the outside of the rotary disk. A rotary head device characterized in that it is provided with: