JPH052703A - Rotary head cylinder device - Google Patents

Abstract

PURPOSE:To make a device compact, and to improve a performance by efficiently, exactly, and easily fixing a rotary transformer used for transmitting the signal of a magnetic head from a rotary side to a fixed side to an upper cylinder, in a rotary head cylinder device used for each kind of electrical equipment. CONSTITUTION:When a rotary, transformer 2 is set at a groove 16 provided at the receiving face of an upper cylinder 4 at the bearing face of the rotary transformer 2, a ring 17 made of a shape memory alloy is arranged along the groove 16, and the shape of the ring 17 is transformed under the optimal temperature and condition of cooling or heating or the like in order to fix the rotary transformer. Thus, the working accuracy of the upper cylinder 4 can be exactly held, and the generation of a distortion can be prevented at the time of fixing, so that the face wobbling of the rotary transformer 2 can be reduced, and the performance of the rotary transformer can be ensured. And also, a rotating precision can be improved, and a high picture quality can be obtained.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary head cylinder device for transmitting signals of a magnetic head used in a magnetic recording / reproducing apparatus by a rotary transformer.

[0002]

2. Description of the Related Art A conventional rotary head cylinder device will be described below.

As shown in FIG. 4, the upper cylinder 4 has a magnetic head 5 for recording and reproducing video signals on a plurality of magnetic tapes.
a and 5b are fixed by head fixing screws 6a and 6b, and the magnetic heads 5a and 5b are connected to the head connectors 11a and 1a.
It is in contact with the rounds 12a, 12b of the rotary transformer 2 on the rotating side via 1b.

A shaft 10 arranged in the lower cylinder 7 has a shaft bearing integrated with the shaft 10 and a bearing, and a rotary disc 9 is bonded to the bearing outer ring 8 which is fixed to the bearing by an adhesive. It is fixed at.

The upper cylinder 4 is fixed to the rotating disk 9 with screws or press-fitting so as to be rotatable.

The coils 14a, 1 are provided in the grooves 13a, 13b provided so as to face the rotary transformer 2 on the rotating side.
4b, rounds 12a, 12b and coils 14a,
14b is connected.

Similarly, the fixed-side rotary transformer 1 is provided with the coil 1 in the grooves 13c and 13d provided in the facing arrangement.
4c and 14d, which are connected to the round of the flexible printed circuit board 15. Also rotary transformer 1
Are attached via a boss 18 with a certain gap from the rotary transformer rotor side.

The rotary transformer 2 is fixed to the upper cylinder 4 with an adhesive 3. The operation of the rotary head cylinder device configured as described above will be described below.

The signals of the magnetic heads 5a and 5b transmitted via the head connectors 11a and 11b pass through the coils 14a and 14b of the grooves 13a and 13b of the rotary transformer 2 and the coils 14c and 14d of the rotary transformer 1.
To the flexible printed circuit board 15 to which the terminals of the coils 14c and 14d are connected.

[0010]

However, in the above conventional structure, the rotary transformers 1, 2 are connected to the cylinder 4,
There is a problem in that it is very difficult to maintain and secure the mounting accuracy of the cylinders 4 and 7 when fixing to the cylinder 7.

The present invention solves the above-mentioned problems of the prior art. A rotary head cylinder device capable of accurately, reliably and easily fixing a rotary transformer to the upper cylinder, and improving the transmission characteristics of the rotary transformer and downsizing. The purpose is to provide.

[0012]

In order to achieve this object, the rotary head cylinder device of the present invention comprises a shape memory alloy ring and a groove provided on the inner surface of the upper cylinder.

[0013]

With this configuration, the rotary transformer can be fixed accurately by simply inserting the shape memory alloy ring.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

1 to 3 showing an embodiment of the present invention, the same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted.

As shown in FIG. 1 to FIG. 4, the shape memory alloy is in a state where the memory temperature is reached with the rotary transformer 2 set on the receiving surface of the rotary transformer 2 of the upper cylinder 4 having the groove 16 formed on the inner surface. The ring 17a made of metal is set along the groove 16, and the ring 17 is transformed into a shape by the optimum temperature and conditions such as cooling or heating, and the rotary transformer 2 is fixedly installed.

As described above, according to the present embodiment, distortion or the like to the upper cylinder 4 due to the fixed installation of the rotary transformer 2 in the assembly of the cylinder unit does not occur because neither screw fixing nor adhesion is performed, so that the upper cylinder 4 is not distorted. There is no deformation and the gap of the rotary transformer 1 can be reduced.
As a result, jitter, rotational unevenness, etc. are reduced, and video signals and audio signals on the magnetic tape pattern can be recorded and reproduced with extremely high accuracy and at the same time the magnetic tape can be stably run.
Further, by reducing the gap of the rotary transformer 1, the crosstalk performance is improved and the image quality can be greatly improved.

Further, the number of steps for assembling the cylinder unit can be greatly reduced because screwing or bonding is not required, yield can be improved and work efficiency can be improved, and serviceability in the market and accuracy at the time of service can be significantly improved.
At the same time, since screws are not used, it is advantageous in terms of space and can be made compact and lightweight.

Incidentally, these structures can be similarly applied to a structure in which the rotary transformer is fixed to the lower cylinder, and similar effects can be obtained. Further, the same configuration can be applied to fixing to a motor stator or the like, and the same effect can be obtained.

[0020]

As described above, the rotary head cylinder according to the present invention has a shape memory alloy ring for fixing the rotary transformer on the rotating side to the upper cylinder, and the groove provided on the inner surface of the upper cylinder. The upper head cylinder device can realize an excellent rotary head cylinder device in which the upper cylinder can be fixed accurately and reliably and easily, the transmission characteristics of the rotary transformer can be improved, and the device can be downsized.

[Brief description of drawings]

FIG. 1 is a schematic sectional view showing the concept of a rotary head cylinder device according to an embodiment of the present invention.

FIG. 2 is a schematic sectional view showing the concept of an upper cylinder of the rotary head cylinder device.

FIG. 3 is an exploded perspective view of a main part of an upper cylinder of the rotary head cylinder device.

FIG. 4 is an external perspective view of a ring of the rotary head cylinder device in a state where a stored temperature is reached.

FIG. 5 is a schematic sectional view showing the concept of a conventional rotary head cylinder device.

[Explanation of symbols]

 1 Rotary Transformer 2 Rotary Transformer 4 Upper Cylinder 5a Magnetic Head 5b Magnetic Head 16 Groove 17 Ring

Claims (1)

Claim: What is claimed is: 1. A bearing for rotatably bearing an upper cylinder having a magnetic head for recording and reproducing a video signal recorded on a magnetic tape, and a rotation for transmitting a signal from the magnetic head from a rotary side to a fixed side. Side rotary transformer and a fixed side rotary transformer, comprising a shape memory alloy ring for fixing the rotary side rotary transformer to the upper cylinder and an inner surface of the upper cylinder. Rotary head cylinder device with a groove.