JPS63175208A - Rotary head cylinder device - Google Patents

Abstract

PURPOSE:To obtain a compact rotary transformer and a compact cylinder and to improve their performances by controlling the clearance between a fixed side rotary transformer and a rotation side rotary transformer fixed onto a disk fixed to a spindle and then fixing the spindle to its bearing unit. CONSTITUTION:A rotation side rotary transformer 13 is fixed to a disk 15 by adhesion in a state where the disk 15 is fitted and fixed to a spindle 14 supported rotatably by a bearing unit 16. A rotary transformer holder 17 is fixed to a fixed side rotary transformer 12 by adhesion. Then the holder 17 and the transformer 12 are fitted at the unit 17 and the clearance is controlled between the transformer 13 and the transformer 12. The holder 17 is fixed to the unit 16 by adhesion and the unit 16 is fixed to a lower cylinder 10 by adhesion. In such a constitution, a compact rotary transformer is obtained together with a compact cylinder with high performance.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a rotary head cylinder device in a rotary head type magnetic recording/reproducing device.

2. Description of the Related Art Conventionally, as a method of supporting a stationary rotary transformer in a rotary head cylinder device, a structure as shown in FIG. 3, for example, has been used.

That is, the bearing units 6a and 6b are fitted and fixed to the lower cylinder 2, and the fixed rotary transformer 4 is adhesively fixed to the lower cylinder 2a. The rotating side rotary transformer is adhesively fixed to the disk 5a. disk 5
adjusts the clearance of the facing surface of the rotary transformer so that the inductance value of the fixed side output of the rotary transformer becomes a predetermined value, and is fitted and fixed to the main shaft at part 5b, and the rotary transformer 3 on the rotating side is connected to the rotary transformer 4 on the fixed side. It is rotatably supported on the main shaft 7 while maintaining a predetermined clearance. The upper cylinder 1 is fixed to the disk 5 with a screw 8 and is rotatably supported on the main shaft.

Problems to be Solved by the Invention In the rotating head system, since the magnetic head itself rotates, a rotary transformer is often used for signal transmission. The inductance value between them has an influence, and this inductance value must be set to an appropriate value.

This inductance value changes depending on the clearance between the facing surfaces of the rotary transformer, and when installing a rotary transformer, variations in this clearance from the designed value sometimes pose a problem. Particularly when the cylinder is downsized, the set value of the clearance becomes smaller, and the installation of the rotary transformer requires particularly high precision. When installing a rotary transformer with a conventional cylinder configuration, it is not possible to fix the rotary transformer while directly measuring the clearance as explained in the conventional example, and if the clearance setting is small, it is difficult to install the rotary transformer. In addition, due to the vibration of the disk relative to the main shaft that occurs when the main shaft and the disk are fitted and bonded, the surface of the rotary transformer tends to run out, the amount of clearance changes depending on the rotational phase angle, and the inductance value tends to vary. In addition, the rotary transformer and disk are fixed by adhesive, but the adhesive area is large (the thickness of the adhesive layer changes depending on temperature and humidity, and the clearance between the rotary transformers changes, etc.), so the clearance must be set with high precision. Hateful.

Means for Solving the Problems In order to solve the above problems, the present invention does not fix the stationary side rotary transformer directly to the lower cylinder, but uses a rotating side rotary transformer that is fixed to a disk that is fitted and fixed in advance to the main shaft. After regulating the clearance with a spacer, the main shaft is fitted and fixed to a bearing unit that rotatably supports the main shaft.

Effect of the Invention With the above-described configuration, the present invention allows rotary transformers to be installed while regulating the amount of clearance between the rotary transformers using spacers, and as a result, the installation can be performed with higher accuracy than the conventional method, making it possible to reduce the clearance between the rotary transformers. Transformers and cylinders can be made smaller and have higher performance.

Embodiment Hereinafter, a rotating head cylinder device according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a cross-sectional view showing one embodiment of the rotary head cylinder device of the present invention, and FIG. 2 is a diagram showing the configuration of the component parts of the rotary head cylinder.
16 is a bearing unit that rotatably supports the main shaft 14 and is fitted and fixed to the lower cylinder 10. 13
12 is a rotating side rotary transformer, and 12 is a stationary side rotary transformer. The rotary transformer is used to transmit signals between the rotating magnetic head 20 and a signal processing circuit (not shown) in a non-contact manner. Reference numeral 17 denotes a rotary transformer receiver for fixing the stationary side rotary transformer to the bearing unit 16, and the disk 15 is fitted and fixed to the main shaft 14 and rotates integrally with the main shaft 14. ,
A head disk 19 is fixed to the disk 15. 1
Reference numeral 1 designates an upper cylinder, which is fitted and fixed to the disk 15 with a nut 18.

Next, the configuration and assembly of the cylinder device will be explained. The main shaft 14 is rotatably supported by a bearing unit 16, and a disk 15 is fitted and fixed to the main shaft 14. In this state, the rotating side rotary transformer 13 is adhesively fixed to the disk 15. The rotary transformer receiver 17 is adhesively fixed to the fixed rotary transformer 12, and then the rotary transformer receiver 17 and the fixed rotary transformer 12 are fitted to the bearing unit 16 between the rotating rotary transformer 13 and the fixed rotary transformer 12. A spacer (not shown) is sandwiched between the rotary transformers to regulate the clearance between the rotary transformers, and the rotary transformer receiver 17 and the bearing unit 16 are adhesively fixed, and the spacer is removed after the adhesive is completed. Next, the bearing unit 16 and the lower cylinder 1° are fitted and fixed by adhesive. The head disk 19 to which the magnetic head 2o has been attached is fixed to the disk 15 with screws (not shown), and the upper cylinder 11 is fitted into the threaded portion 15a of the disk 15 and fixed with a nut 18.

As described above, since the rotary transformer is installed with the clearance between the facing surfaces of both ends and the tally transformer regulated by the spacer, the clearance between the rotary transformers can be managed with high precision against the design value.
Furthermore, it is possible to prevent the opposing surfaces of the double-end-tally transformer from being installed parallel to each other, and the clearance varying depending on the rotation angle of the cylinder, resulting in the inductance value between the rotary transformers becoming unstable.

Effects of the Invention The present invention fixes the fixed side rotary transformer, which was conventionally fixed to the lower cylinder, to the bearing unit, thereby making it possible to set the clearance between the rotary and fixed ports and the tally transformer with higher accuracy, which is better than the conventional method. The clearance can be narrowed more than that of the cylinder device of 2.0, and the rotary transformer can be made smaller, and the cylinder can be made smaller and have higher performance.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a cylinder device showing an embodiment of the present invention, FIG. 2 is a configuration diagram of a cylinder assembly, and FIG.
FIG. 2 is a configuration diagram of a conventional cylinder. 10...Lower cylinder, 11...Upper cylinder, 12...Fixed side rotary transformer, 1
3... Rotating side rotary transformer, 14...
...Main shaft, 15...Disk, 16...
...Bearing unit, 17...Rotary transformer receiver, 18...Nand, 19...Head disk. Name of agent: Patent attorney Toshio Nakao To---
Lower sill n-m-upper shilling 16- Bearing unit Fig. 1

Claims (1)

[Claims] an upper cylinder and a lower cylinder, a head unit, a main shaft, a bearing unit rotatably supporting the main shaft and fitted and fixed to the lower cylinder, a disk fixedly supported by the main shaft, and a bearing unit fixedly supported on the main shaft; a support member for fixedly supporting the head unit and the upper cylinder;
A rotating side rotary transformer integrally fixed to the disk, and a fixed side rotary transformer forming a pair with the rotating side rotary transformer, and the fixed side rotary transformer is fixedly supported by the bearing unit. Features a rotating head cylinder device.