JPH06290959A - Shield structure for rotating transformer - Google Patents

Abstract

PURPOSE:To provide a shield structure for a rotating transformer, wherein a shield wire can be easily mounted on a core. CONSTITUTION:The shield structure for a rotating transformer is equipped with grooves 81, 82, and 83 for winding and grooves 87 and 88 for shield wire provided at a prescribed pitch onto the surface of a core 80 of a rotating transformer and grooves 85, 85, and 85 for lead wire provided crossing the grooves 81 to 83 and others, wherein shield wires connected together by a connector are mounted corresponding to the grooves 87 and 88.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to, for example, a rotary magnetic head device for a VTR, in which a signal is transmitted in a non-contact manner between a rotary drum to which a magnetic head is attached and a fixed drum connected to a VTR main body. The present invention relates to improvement of a rotary transformer for performing transmission.

[0002]

2. Description of the Related Art Conventionally, in such a rotary transformer, a cylindrical core as shown in FIG. 12 is used. In the figure, a cylindrical core 1 is a core on the primary side that is the inner side, and is provided with a plurality of grooves 3a along the circumferential direction on the outer surface of the cylindrical main body made of ferrite or the like.
3b and 3c are formed. A plurality of windings 5, 6 and 7 are respectively wound in these grooves, and each winding is prepared for each channel of a VTR signal, for example.

Further, the core 1 has the above-mentioned grooves 3a, 3b, 3
Leader wire grooves 8 extending in the vertical direction in the drawing are formed so as to cross c. This lead wire groove 8, 8
Is used to draw the lead wire from each winding.

In such a rotary transformer 1 for exchanging signals of a plurality of channels, for example, the current flowing through the winding 3a corresponding to the first channel is influenced by the magnetic field formed by the action with the core, and the adjacent windings are wound. Noise may enter the line 3b, and so-called crosstalk may occur. In order to avoid this, conventionally, as shown in FIG. 13, another groove 1 is provided between the winding grooves 3a and 3b on the surface of the core 1.
a is provided, a wire made of a thin conductive material such as copper is spread over the groove 8a, and both ends are soldered to form a shield ring.

FIG. 14 shows an outer core 10 for forming a rotary transformer in combination with such a cylindrical inner core. In the figure, a plurality of winding grooves are formed inside the cylindrical body of the core 10 along the inner peripheral direction. As shown in FIG. 15, the winding grooves are formed along the central axis direction by 13a, 13b, 13
It is arranged as c and 13d. Windings such as 18, 19 prepared for each channel are mounted in these grooves.

In this case, the windings 18 and 19 are wound outside the core, and the grooves 13a and 1 on the inner circumference of the outer core 10 are wound.
Insert into 3b, 13c, 13d. At this time, since the windings 18 and 19 have a diameter larger than the inner diameter of the outer core 10, the windings 18 and 19 are deformed as shown in the drawing, and the outer core 1 is deformed.
Each of the windings is inserted into the outer ring 0 and is returned to its original shape by a predetermined jig or the like so that the winding extends along the inner circumference of the outer core.

Further, the shield ring 12 is inserted in the water core 10 so that crosstalk does not occur between the channels of the windings 18 and 19. Specifically, as shown in FIG. 15, the winding groove 13
Shield ring grooves 15a, 13b, 15c are provided between the grooves a, 13b, 13c, 13d. Each of the shield rings 12 is deformed and inserted into these grooves as shown in the drawing. Furthermore, by inserting a predetermined jig or the like into the outer core 10, the shield ring is modified to its original shape so as to be mounted along the inner circumference of the outer core.

FIG. 16 shows a different type of core from the above core. In the figure, the core 20 is formed in a disk shape having a through hole 22 in the center, and a plurality of winding grooves 21, 23 are formed concentrically on the surface of the core 20. These grooves 21 and 23 have windings 24 and
25 are mounted so that currents corresponding to signals of different channels are applied to the respective windings.

Therefore, between the winding wire 24 and the winding wire 25, the shield ring 2 is provided in a groove formed in a concentric pattern so that crosstalk does not occur between the channels corresponding thereto.
6 is installed.

[0010]

In these rotary transformer cores, in order to prevent crosstalk between channels between adjacent windings, as described above,
I am using a shield ring. These shield rings are separately formed between the windings corresponding to the respective channels and inserted one by one, so that the workability of attaching the shield ring is poor.

In particular, a rotary transformer for exchanging signals corresponding to a large number of channels has a large number of windings. For this reason, it has been extremely complicated work to mount a large number of shield rings between the respective windings by the above-mentioned work.

The present invention has been made to solve the above problems, and an object thereof is to provide a shield structure for a rotor transformer in which a shield wire can be attached to a core by a simple operation. There is.

[0013]

According to the present invention, the above object is to provide a plurality of winding grooves and a plurality of shield wire rod grooves formed at a predetermined pitch on the core surface of a rotary transformer, and these grooves. In a shield structure of a rotary transformer including a lead wire groove formed so as to traverse, a rotary transformer in which a plurality of shield wire rods are connected and connected by a connecting portion in correspondence with the plurality of shield wire rod grooves. This is achieved by the shield structure of.

The rotary transformer core may be formed in a cylindrical shape. Further, for example, the rotary transformer core may be formed in a disk shape.

[0015]

According to the above construction, the plurality of shielded wire members connected by the connecting portion are mounted between the windings corresponding to the respective channels. Therefore, a plurality of shielded wire rods can be mounted at the same time.

[0016]

Preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. The examples described below are
Since it is a preferred specific example of the present invention, various technically preferable limitations are attached, but the scope of the present invention is, unless otherwise stated to limit the present invention, in the following description.
It is not limited to these modes.

1 and 2 respectively show the structure of the shield wire used in the preferred embodiment of the present invention. These shield wire rods (shield rings) are for forming a shield structure of a cylindrical inner core of the rotary transformer core as shown in FIG.

In FIG. 1, reference numeral 32 indicates a first example of an integrally formed shield wire. The integrated shield wire rod 32 is formed using a material such as a thin copper plate. This shielded wire rod 32 has a plurality of wire rod bodies 33a, 33b, 33 extending in parallel in the figure.
c and connecting portions 34 and 35 that extend in a direction orthogonal to the extending direction and connect these.

These wire main bodies 33a, 33 extending in parallel
The b and 33c are arranged in advance at a pitch that matches a groove for a shield ring formed on the outer periphery of the inner core of the rotary transformer, which will be described later. As a result, the wire rod bodies 33a, 33b, 33c are each used as a shield ring mounted between the plurality of windings. The connecting portions 34 and 35 have a width and a length that can be tightly accommodated in the lead wire groove of the inner core, which will be described later.

FIG. 2 shows a second example of the integrated shield member. The entire shield member 42 is configured by using, for example, a flexible substrate. Specifically, the flexible board includes a plurality of wire rod main body portions 43a, 43b, and 44c extending in parallel, and connecting portions 44 and 45 integrally provided so as to cross these wire rod main body portions 43a, 43b, and 44c.

Further, as shown in the drawing, for example, copper patterns 46a, 46b, 46 are formed on the wire rod main bodies 43a, 43b, 44c along the direction in which they extend.
c is formed. These copper patterns 46a, 46
b and 46c are arranged in parallel at intervals so as to match the pitch of the shield ring grooves formed on the outer periphery of the inner core, which will be described later, and these are respectively attached to the plurality of windings. It corresponds to a ring.

FIG. 3 shows a cylindrical inner core for a rotary transformer similar to the conventional one.
Is a plurality of grooves 53a, 53b, 53c along the circumferential direction on the outer surface of the cylindrical body made of ferrite or the like.
Are formed. A plurality of windings 55,
56 and 57 are wound, and each winding is, for example, V
It is prepared for each channel of TR signals.

In the core 1, the grooves 53a, 53 are formed.
Leader wire grooves 58, 58 extending in the vertical direction in the drawing are formed so as to traverse b, 53c. The lead wire grooves 58, 58 are used for leading the lead wire from each winding.

Between the grooves 53a, 53b, 53c in which the windings 55, 56, 57 are installed, grooves 50a, 50 for installing a shield wire (shield ring) are provided.
b and 50c are formed respectively. In each of these grooves, for example, the shield wire 32 shown in FIG. 1 is mounted as shown in FIGS. 4 and 5.

4 and 5 are side views showing the procedure for mounting the shield wire 32 on the inner core 50.
In these figures, the winding groove 53 is shown for convenience of illustration.
a, 53b and 53c are omitted. As shown in FIG. 4, the connecting portion 34 is housed in the one lead wire groove 58, and the shield wire 32 is wound around the outer circumference of the inner core 50. As a result, the wire rod bodies 33a, 33b, 33c are simultaneously mounted in the grooves 50a, 50b, 50c formed on the outer periphery of the inner core 50.

As shown in FIG. 5, the wire rod bodies 33a, 33
By mounting the ends of b and 33c on the connecting portion 34 and soldering, the attachment of the shield wire 32 is completed. Therefore, unlike the conventional case, it is not necessary to perform the same mounting work for the number of shielded wire rods, and a plurality of shield rings can be mounted by performing the above-mentioned mounting work only once.
Here, since the wire rod bodies 33a, 33b, 33c are connected in advance by the connecting portions 34 and 35, they are electrically connected. Then, since it is fixed in a ring shape by the above-mentioned soldering, each wire rod main body 33a, 33b, 33c
Can perform the same shielding action as shield rings.

In this embodiment, the wire body 33a,
Since 33b and 33c are three, three shield rings are formed, but depending on the number of VTR channels, etc.
An appropriate number of wire bodies can be set.

Even when the shield wire 42 in the embodiment of FIG. 2 is used, a plurality of shield rings can be wound around the outer circumference of the inner core at the same time by the mounting work substantially similar to the above-mentioned work. At this time, each copper pattern 43a, 4
Since 3b and 43c are not connected to each other in the state of the shield wire 42 in FIG.
It is conducted with solder or the like.

After the shield ring is attached to the inner core 50, a winding (not shown) is attached by the same method as the conventional one.

FIG. 6 shows a structure in which a shield ring is attached to the outer core 60 combined with the above-mentioned inner core 50. Here, the outer core 60 is shown in FIG.
Since it has the same structure as the conventional outer core shown in FIG. 5, duplicated description will be omitted.

Here, FIG. 6 shows a third example of an integrated shield wire. In the drawing, the shielded wire rod 62 of the third example has a width and a length that can be tightly accommodated in the lead wire groove 68 formed in the outer core.
A connecting member 64 formed of a flexible substrate or the like, and three wire rod main bodies 63 whose one end is fixed to the connecting member 64.
a, 63b, 63c. These wire rod bodies 63a, 63b, 63c are made of elastic conductive wire rods, and are formed in an R shape along a groove (not shown) for the shield ring provided on the inner circumference of the outer core 60, and the other end is formed. The side is not fixed.

Then, each of these wire rod bodies 63a, 63
One end sides of the b and 63c have the same pitch as the shield ring groove (see FIG. 15) provided between the plurality of winding grooves formed on the inner circumference of the outer core 60 and the connecting member 6
It is fixed to 4.

In this integrated shielded wire rod 62, since the other end sides of the respective wire rod bodies 63a, 63b, 63c are separated from each other, the wire rod main body 63a, 63b, 63c can be inserted into the outer core 62 in the state shown in FIG. At this time, the connecting member 64 is inserted into the lead wire groove 68 of the outer core 60 while utilizing elasticity. In this case, each wire rod body 63a, 63b, 6
Since 3c respectively enter into the groove for the shield ring in the outer core 60, if the other end side of each wire rod body is soldered to the connecting member 64, a plurality of pieces (three pieces in the case of the drawing) can be formed in one operation. ) Can be equipped with a shield ring.

Reference numeral 72 indicates a fourth example of the integrated shield wire rod. The connecting member 74 of the shield wire 72 is
It has a width and a length that can be tightly accommodated in the lead wire groove 68 formed in the outer core 60, and is formed of a flexible substrate or the like. A plurality of wire rod main bodies 73a, 73b, 73c made of a conductive wire rod having a ring shape are fixed to the connecting member 74 so as to extend along the shield ring groove formed on the inner circumference of the outer core 60. Has been done.

These wire rod bodies 73a, 73b, 73c
Are fixed to the connecting member 64 at the same pitch as the plurality of shield wire rod grooves formed on the inner circumference of the outer core 60. Therefore, as shown in the drawing, each of the wire rod main bodies 73a, 73b, 73c is deformed, the plurality of wire rod main bodies are inserted into the outer core 60 at a time, and the elastic force of the wire rod main body restores the original shape. Thereby, a plurality of shield rings can be simultaneously attached to the outer core 60.

The outer core 60 to which the third and fourth integrated shield wire rods 62 and 72 should be attached.
The lead wire groove 68 of is slightly wider than the other lead wire grooves depending on the shape of the connecting members 64 and 74, which facilitates the work.

FIG. 7 shows an example of a rotary transformer core formed in a disk shape. In the figure, the core 80
Are formed in a disk shape having a through hole 84 in the center, and a plurality of winding grooves 8 are concentrically formed on the surface of the core 80.
1, 82, 83 are formed. These grooves 81,8
Windings 91, 92 and 93 are attached to the windings 2 and 83, respectively, and currents corresponding to signals of different channels are passed through the windings.

Therefore, between the winding 91 and the winding 92, and between the windings 92 and 93, grooves 87 and 88 are formed in concentric circles so that crosstalk does not occur between the corresponding channels. An integral shield ring 100 is attached to the.

The integrated shield member 100 of this fifth example
As shown in the plan view of FIG. 8, a plurality of (two in the figure) ring-shaped wire rod main bodies 101, 1 arranged concentrically.
02 and connecting portions 105, 105, 105 for connecting the wire rod bodies 101, 102.

Here, the wire rod bodies 101 and 102 and the connecting portions 105, 105 and 105 are integrally formed by using, for example, copper foil or the like. In addition, the connecting portions 105 and 10
In FIG. 7, reference numerals 5 and 105 have a shape that can be inserted into the lead wire grooves 85, 85, 85 for windings that are radially provided in the core 80.

Then, as shown in FIG. 7, the lead wire groove 85 and the shield member groove are provided as shown in FIG. 9 so that the windings 91, 92, 93 can be mounted on the integrated shield member. 87 is formed deepest than the groove for winding or the like.

As a result, even in a rotary transformer having a large number of channels, it is not necessary to mount shield members to be provided between the windings one by one as in the conventional case, and a plurality of shield members can be installed in one operation. All can be installed. In this case, in the conventional case, the ring-shaped shield member becomes larger toward the outer peripheral side, which is accompanied by difficulty in work such as easy distortion, but such a harmful effect disappears,
The mounting work can be easily performed.

FIG. 10 shows how the winding and the shield member are mounted in a different order from the above. In the figure, if the channel setting is such that a minute current flows through the winding 91 and a large current flows through the winding 92, noise is likely to enter the winding 91.

In this case, in the order shown,
The winding 91, which is the minute current side, is attached first, and as shown in FIG. 11, the winding 91 is formed at the connecting portion 105 which is the copper foil portion.
So that it covers the leader line 91a. As a result, noise can be effectively prevented from entering the winding 91 side from the winding 92 side, and suitable shielding can be performed.

As described above, according to each of the above-described embodiments, since the plurality of shielded wire members are integrated by the connecting portion or the connecting portion, it is not necessary to mount the shielded wire materials one by one as in the conventional case, and the shield member is not required. It is possible to reduce the number of man-hours for the mounting work. Moreover, even if it is difficult to mount the shield member by itself, by mounting the shield wire in a state where it is integrally formed,
The mounting work can be facilitated.

The connecting portion for forming the integrated shielded wire used in the present invention may be formed integrally with the shielded wire or the wire body, or may be formed separately from these as a connecting member.

[0047]

As described above, according to the present invention, it is possible to provide a shield structure for a rotor transformer in which a shield ring can be attached to a core by a simple operation.

[Brief description of drawings]

FIG. 1 is a plan view showing a first example of an integrated shield wire used in a shield structure for a rotary transformer of the present invention.

FIG. 2 is a plan view showing a second example of the integrated shielded wire used in the shield structure of the rotary transformer of the present invention.

FIG. 3 is a schematic perspective view showing a cylindrical inner core.

FIG. 4 is a schematic side view showing how the integrated shield wire is attached to the core of FIG.

5 is a schematic side view showing a state in which an integrated shield wire is attached to the core of FIG.

FIG. 6 is a schematic perspective view showing a manner in which an integrated shield wire is attached to a cylindrical outer core.

FIG. 7 is a schematic perspective view showing a manner in which an integrated shield wire is attached to a disk-shaped core.

8 is a plan view showing an integrated shield wire rod (fifth example) mounted on the core of FIG. 7. FIG.

9 is a schematic perspective view showing an enlarged main part of the core of FIG. 7. FIG.

10 is a schematic perspective view showing another mounting sequence of the integrated shield body shield wire of FIG.

11 is a schematic perspective view of a main part showing the relationship between the integrated shielded wire rod of FIG. 8 and a winding.

FIG. 12 is a schematic perspective view showing a cylindrical inner core.

13 is a diagram showing a state in which a shield wire is attached to the inner core of FIG.

FIG. 14 is a schematic perspective view showing a cylindrical outer core.

15 is a schematic perspective view showing how the winding wire and the shield wire are attached to the outer core of FIG.

FIG. 16 is a schematic plan view showing a disk-shaped core.

[Explanation of symbols]

 32 Integrated Shielded Wire Material 42 Integrated Shielded Wire Material 62 Integrated Shielded Wire Material 72 Integrated Shielded Wire Material 100 Integrated Shielded Wire Material 55 Winding 56 Winding 57 Winding 91 Winding 92 Winding 93 Winding 34 Coupling 35 Coupling 44 Connection part 45 Connection part 64 Connection member 74 Connection member 105 Connection part 50 Inner core 60 Outer core 80 Disc-shaped core

Claims (3)

[Claims] 1. A plurality of winding grooves and a plurality of shield wire material grooves formed at a predetermined pitch on a core surface of a rotary transformer, and a lead wire groove formed so as to cross these grooves. A shield structure for a rotary transformer comprising: a shield structure for a rotary transformer, wherein a plurality of shield wire members are mounted by being connected by a connecting portion in correspondence with the plurality of grooves for shield wire members. 2. The shield structure for a rotary transformer according to claim 1, wherein the rotary transformer core has a cylindrical shape. 3. The shield structure for a rotary transformer according to claim 1, wherein the rotary transformer core has a disk shape.