JPH04254309A - Rotary transformer - Google Patents

Abstract

PURPOSE:To obtain a rotary transformer capble of signal transmission in various kinds of signal bands with one rotary transformer, in a rotary transformer to, be mounted as a signal transmission parts of a rotary head cylinder. CONSTITUTION:Inner side magnetic members 8a-8c and outer side magnetic members 9a-9c are constituted of magnetic materials suitable to the respective signal bands of the respective signal transmission systems, and shield rings 14, 15 are interposed between the magnetic members. The above magnetic members 8a-8c, 9a-9c are retained by retainers 16, 17 arranged on the sides opposite to the facing surfaces. By winding coils 12, 13 in winding grooves 10, 11, an excellent rotary transformer capable of various kinds of signal transmission free from signal band limitation is obtained.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary transformer mounted as a signal transmission component in a rotary head cylinder of a video tape recorder, digital audio tape, or the like.

0002

[Background Art] In recent years, new technology has been developed in magnetic recording and reproducing devices such as video tape recorders. There is also a need to develop rotary transformers that are more suitable for the intended use of the equipment.

A conventional rotary transformer will be explained below. FIG. 2 is a sectional view showing the configuration of a conventional rotary transformer. In FIG. 2, reference numeral 1 denotes a cylindrical inner magnetic body, and a coil 5 is wound around an outer peripheral groove 3 of the inner magnetic body. 2 is a cylindrical outer magnetic body, and an inner circumferential groove 4 is formed at a position facing the winding groove 3 of the inner magnetic body 1, and a coil 6 is formed in this inner circumferential groove 4.
is wound. Further, in order to reduce interference between a plurality of signal transmission systems, a short ring 7 is installed between the coils 5 of the inner magnetic body 1.

0004

However, in the above-mentioned conventional structure, since the inner magnetic body 1 and the outer magnetic body 2 are made of the same magnetic material, the scope of application of one rotary transformer is limited. In recent years, increasingly multifunctional
The problem has been that it is difficult to satisfy the desired characteristics of high-performance video equipment and the like. In other words, in a rotary transformer that has multiple signal transmission systems, the uses of each signal transmission system are diversified, and the difference between systems that transmit signals in low frequency bands and systems that transmit signals in high frequency bands is widening. However, it has become difficult to transmit signals in all these bands using the same magnetic material.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, and aims to provide a rotary transformer capable of transmitting signals in a wide variety of signal bands using a single rotary transformer.

[0006]

[Means for Solving the Problem] In order to solve this problem, the rotary transformer of the present invention divides the magnetic material itself for each predetermined signal transmission system, and uses the material of the magnetic material suitable for the purpose of use. These magnetic bodies are held by a cylindrical holder disposed on the opposite side of the winding groove, and a cylindrical non-magnetic body is interposed between each divided magnetic body. , which has a magnetically divided structure.

[0007]

[Function] With the above configuration, magnetic material can be used depending on the purpose of use of the signal transmission system, such as using a low frequency magnetic material for low frequency band signal transmission and a high frequency magnetic material for high frequency band signal transmission. By selecting materials, it is possible to obtain an excellent rotary transformer capable of transmitting signals in a wide variety of signal bands with a single rotary transformer.

[0008]

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

FIG. 1 is a sectional view showing the structure of a rotary transformer in one embodiment of the present invention.

In FIG. 1, 8a, 8b, and 8c are cylindrical inner magnetic bodies, and 9a, 9b, and 9c are cylindrical outer magnetic bodies, and magnetic materials suitable for each signal transmission system are used. These magnetic bodies 8a to 8c and 9a to 9c are provided with winding grooves 10 and 11 at opposing positions on opposing surfaces, and are held by an inner holder 16 and an outer holder 17 on the opposite surface. There is. In addition, the opposing winding grooves 10
, 11 are wound with an inner coil 12 and an outer coil 13, respectively, and an inner shield ring 14 made of a non-magnetic material is disposed between the inner magnetic bodies 8a to 8c and the outer magnetic bodies 9a to 9c so as to separate them. and an outer shield ring 15 are installed.

The operation of the rotary transformer constructed as described above will be explained below.

[0012] In this embodiment, the three signal transmission systems each use a different magnetic material suitable for its intended use.
These magnetic materials are completely magnetically separated by interposing shield rings 14 and 15 as non-magnetic materials. Therefore, each of the magnetic bodies 8a to 8c and 9a to 9c, which are magnetically divided, can use the most suitable magnetic body for each signal transmission system, and can be applied over a wide range without being restricted in its range of use. become able to.

As described above, according to this embodiment, a magnetic material suitable for the intended use is used for each predetermined signal transmission system, and the shield rings 14 and 15 are interposed between them, so that one rotary A rotary transformer capable of transmitting signals in a wide variety of signal bands can be obtained.

[0014] In this embodiment, an example in which the facing surfaces have a double structure with one set is shown, but this may be a structure with multiple layers as required.

[0015] Also, in this embodiment, an example is shown in which there are three signal transmission systems and all of them are magnetically independent; however, there may be any number of signal transmission systems, and it may be possible to Therefore, not all signal transmission systems need to be magnetically independent, and this configuration may be used partially.

Furthermore, in this embodiment, all the cylindrical magnetic bodies are held by a holder disposed on the opposite side of the opposing surface, but this holder partially holds the cylindrical magnetic bodies. Alternatively, the present configuration may be used without this holder.

[0017]

Effects of the Invention As described above, the present invention divides a cylindrical magnetic body into each predetermined signal transmission system using a magnetic material that has passed the intended use, and creates a cylindrical shape between the divided magnetic bodies. By interposing the non-magnetic material, it is possible to realize an excellent rotary transformer that can transmit signals in a wide variety of signal bands with a single rotary transformer.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the configuration of a rotary transformer in an embodiment of the present invention.

[Figure 2] Cross-sectional view showing the configuration of a conventional rotary transformer

[Explanation of symbols]

8a　Inner magnetic body 8b Inner magnetic body 8c Inner magnetic body 9a　Outer magnetic body 9b Outer magnetic body 9c　Outer magnetic body 10 Winding groove 11 Winding groove 12 Inner coil 13 Outer coil 14 Inner shield ring 15 Outer shield ring 16 Inner holding body 17 Outer holding body

Claims (1)

[Claims] Claim 1: A plurality of winding grooves are provided in opposing surfaces of a cylindrical inner magnetic body and an outer magnetic body, and the magnetism of at least one of the inner magnetic body and the outer magnetic body is The body is held by a cylindrical holder disposed on the opposite side of the opposing surface, and a shield ring made of a non-magnetic material is installed between the winding grooves on the holder at least at one location. A rotary transformer in which each of the divided magnetic bodies is made of a different material depending on the intended use of the device, and a coil is provided in the winding groove of each of the magnetic bodies.