JP3430665B2 - Rotary transformer device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary transformer device provided in a rotary head device such as a video tape recorder.

[0002]

2. Description of the Related Art A rotary head device for a video tape recorder, for example, is constructed as shown in FIG. In FIG. 3, 1 is a stator part, 2 is a rotating shaft, and the rotor part 3 is attached to this rotating shaft 2. Further, the rotary drum portion 4 is fixed to the rotary shaft 2, and the rotor portion 3 and the rotary drum portion 4 are rotated integrally with the rotary shaft 2.

Further, a relay pin 5 to which a lead wire of a rotary transformer described later is connected is provided on the upper surface of the rotor portion 3. A substrate 6 is provided on the lower surface of the rotary drum portion 4, and the tip of the relay pin 5 is connected to the contact 7 on the substrate 6. The contact 7 is connected to each circuit element 9 through the wiring pattern 8 on the substrate 6, and is connected to the magnetic head 10 through these circuit elements 9.

In this device, a rotary transformer is used for inputting / outputting signals between the stator section 1 and the rotor section 3. That is, the illustrated example shows a cylindrical rotary transformer, and is provided with a stator core 11 and a rotor core 12, which are made of a magnetic material, for example. In addition, grooves 13 and 14 are formed on the inner peripheral surface of the stator core 11 and the outer peripheral surface of the rotor core 12, respectively, for the number of channels of signals input and output in the circumferential direction. 15 and 16 are wound.

Therefore, in this device, the stator core 1
Input and output of signals is performed by inductive coupling between the lead wire 15 wound around 1 and the lead wire 16 wound around the rotor core 12. That is, for example, a signal from the outside is transmitted from the lead wire 15 to the lead wire 16 by inductive coupling,
It is supplied to each circuit element 9 through the relay pin 5, the contact 7, and the wiring pattern 8 on the substrate 6. Then, these circuit elements 9 are supplied to the magnetic head 10 for recording.

The signal reproduced by the magnetic head 10 is supplied to each circuit element 9, and is supplied from the circuit element 9 to the lead wire 16 through the wiring pattern 8, the contact point 7 and the relay pin 5 on the substrate 6. . Then, it is transmitted from the lead wire 16 to the lead wire 15 by inductive coupling, and is output from the lead wire 15 to the outside (not shown). In this way, input / output of signals is performed by inductive coupling between the lead wire 15 wound around the stator core 11 and the lead wire 16 wound around the rotor core 12.

Further, FIG. 4 is a perspective view showing the structure of a cylindrical rotary transformer. In FIG. 4, only the structure of the inner rotor core 12 is shown with the outer stator core 11 removed. In FIG. 4, grooves 14 are formed on the outer peripheral surface of the cylindrical core 12 for the number of channels of signals input and output in the circumferential direction. And these grooves 1
A lead wire 16 is wound around each of the wires 4.

A groove 17 is formed on the outer peripheral surface of the rotor core 12 in the rotation axis direction. A relay terminal portion 18 made of, for example, resin is provided on the upper surface side of the rotor core 12, and the above-mentioned relay pin 5 is planted in the relay terminal portion 18. The lead wires 16 described above are led out to the upper surface of the rotor core 12 through the grooves 17, and the end portions of the lead wires 16 are connected to the relay terminal portion 1
8 is connected to the relay pin 5 which is planted.

By the way, in such a rotary transformer device, the vicinity of the relay pin 5 is enlarged as shown in FIG. That is, in FIG. 5, the lead wire 16 led out to the upper surface of the rotor core 12 through the groove 17
Is wired so as to be pressed against each surface of the rotor core 12 and the relay terminal portion 18, and is wound around the base portion of the relay pin 5. In this case, connect the lead wire 16 to the rotor core 1
The lead wire 16 is lifted to interfere with the circuit element 9 of the substrate 6 on the rotating drum portion 4, or the stator core 1
This is to prevent the problem of contact with the first and causing damage.

However, in such a rotary transformer device, if the lead wire 16 connected to the relay pin 5 is strongly pulled, the lead wire 16 pressed against each surface and wired may float. Further, the end portion of the lead wire 16 may be lifted up by the centrifugal force generated by the rotation of the rotor core 12. When the end portion of the lead wire 16 rises in this way, the raised end portion interferes with the circuit element 9 or the like of the substrate 6 on the rotary drum portion 4 or contacts the stator core 11 to cause damage. There was a risk of.

FIG. 6 shows an example of a plane-opposing rotary transformer. In this plane-opposing rotary transformer, for example, a disk-shaped stator core and a rotor core made of a magnetic material are provided so as to face each other, and concentric circular grooves corresponding to the number of channels are formed on the opposing surfaces of these cores. . Further, a lead wire is wound around this groove so that a signal is input / output by inductive coupling of each lead wire.

In FIG. 6, for example, the back side of the rotor core 21 is shown. On the back side, for example, a resin relay terminal portion 22 is provided, and on the relay terminal portion 22, a hill portion 23 is provided. The relay pin 24 is planted. Further, the end portion of the lead wire 25 wound in the groove on the facing surface is led out to the back surface side through the hole 26 penetrating the rotor core 22 and connected to the relay pin 24.

That is, FIG. 7 is an enlarged view of the vicinity of the relay pin 24. First, in FIG.
The end portion of the lead wire 25 led out to the back surface side is wired so as to be pressed against each surface of the relay terminal portion 22 and the hill portion 23, and is wound around the base portion of the relay pin 24. Further, in FIG. 7B, the end of the lead wire 25 led out to the back surface side through the hole 26 is wound around the base of the relay pin 24 through below the hill portion 23 where the relay pin 24 is set up.

However, also in this case, if the lead wire 25 connected to the relay pin 24 is strongly pulled, the lead wire 25 pressed against each surface and wired may float. Further, the end portion of the lead wire 25 may be lifted up by the centrifugal force generated by the rotation of the rotor core 21. When the end portion of the lead wire 25 rises in this way, the raised end portion interferes with the circuit element 9 or the like of the substrate 6 on the rotating drum portion 4 described above, or contacts the stator core to cause damage. There was a risk of problems.

[0015]

This application has been made in view of the above-mentioned problems, and the problem to be solved is that in the conventional device, the centrifugal force generated by the rotation of the core causes a problem. The end of the lead wire may float, and when the end of the lead wire floats in this way, the lifted end interferes with the circuit element of the substrate on the rotating drum part, or the core on the stator side. It is said that there was a risk of contact and causing damage.

[0016]

A first means according to the present invention is at least a rotary transformer apparatus in which a stator core around which a lead wire is wound and a rotor core around which a lead wire is wound face each other. The relay pins 5 and 24 are provided at the ends of the rotor cores 12 and 21, and
In the vicinity of the relay pin, convex portions 19 and 2 which form a locking portion in a direction parallel to the direction in which the stator core and the rotor core face each other and in a direction in which centrifugal force is applied by the rotation of the rotor core.
7 is provided, and the end portions of the lead wires 16 and 25 are locked to the convex portion to be connected to the relay pin.

According to a second aspect of the present invention, in the rotary transformer device according to the first aspect, when the stator core and the rotor core are cylindrical, the convex portion is projected in the rotation axis direction of the rotor core. Is a rotary transformer device.

According to a third aspect of the present invention, in the rotary transformer device according to the first aspect, when the stator core and the rotor core are of a plane facing type, the convex portion is projected in the rotational direction of the rotor core. Is a rotary transformer device.

[0019]

According to this, the end portion of the lead wire connected to the relay pin is connected to the relay pin by being locked to the convex portion formed with the locking portion in the direction in which the centrifugal force is applied by the rotation of the core. Since the end of the lead wire is not lifted by the centrifugal force generated by the rotation of the core, the lifted end of the lead wire interferes with the circuit element of the substrate on the rotating drum part or the stator part. It is possible to eliminate the fear of contact with the core on the side and causing damage.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the construction of the main part when the present invention is applied to a cylindrical rotary transformer.

In FIG. 1, a convex portion 19 is provided on the upper surface of the relay terminal portion 18 between the relay pin 5 and the upper end of the groove 17. The convex portion 19 is provided so as to project in the rotation axis direction of the rotor core 12. That is, in the cylindrical rotary transformer, the convex portion 19 is formed parallel to the direction of the surface where the stator core 11 and the rotor core 12 face each other. Therefore, the convex portion 19 forms a locking portion in a direction in which centrifugal force is applied by the rotation of the rotor core 12.

The lead wire 16 led out to the upper surface of the rotor core 12 through the groove 17 is wired through the surface of the convex portion 19 on the rotary shaft side as shown in the drawing, and the base portion of the relay pin 5 is provided. Wrapped around.

Therefore, in this device, the rotor core 12
When the centrifugal force is generated by the rotation of the lead wire 16, the centrifugal force acts on the lead wire 16 so that the lead wire 16 is pressed against the convex portion 19. As a result, the lead wire 16 is fixed to the convex portion 19, the end portion of the lead wire 16 is lifted, and interferes with the circuit element 9 or the like of the substrate 6 on the rotating drum portion 4 or contacts the stator core 11 to prevent damage. The risk of causing problems is prevented.

Thus, according to the above-described device, the end portion of the lead wire connected to the relay pin is locked to the convex portion formed with the locking portion in the direction in which the centrifugal force due to the rotation of the core is applied to the relay pin. Since the connection is made, there is no fear that the end of the lead wire will float up due to the centrifugal force generated by the rotation of the core, and the lifted end of the lead wire will not interfere with the circuit elements of the board on the rotating drum. It is possible to eliminate the risk of causing damage by coming into contact with the core on the stator side.

Further, FIG. 2 shows the structure of the main part when the present invention is applied to a flat type rotary transformer. Note that A is a perspective view and B is a side view.

In FIG. 2, convex portions 27 are provided on both sides of the hill portion 23 of the relay terminal portion 22. In addition, this convex portion 27
Are provided so as to project in the rotation direction of the rotor core 21.
That is, in the flat-faced rotary transformer, the convex portion 27 is formed parallel to the direction in which the stator core and the rotor core 21 face each other. Therefore, the convex portion 27 forms a locking portion in a direction in which centrifugal force is applied by the rotation of the rotor core 21.

Then, the relay terminal portion 2 is provided through the hole 26.
The lead wire 25 led out to the upper surface of 2 is wired via the surface of the convex portion 27 on the rotating shaft side as shown in the drawing, and is wound around the base portion of the relay pin 24.

Therefore, in this device, the rotor core 21
When a centrifugal force is generated by the rotation of, the centrifugal force acts so that the lead wire 25 is pressed against the convex portion 27. As a result, the lead wire 25 is fixed to the convex portion 27, and the end portion of the lead wire 25 is prevented from floating and interfering with the circuit element 9 or the like of the substrate 6 on the rotary drum portion 4. It is also possible to prevent the lead wire 25 from interfering with other parts when the drum is assembled.

Thus, also in the above-mentioned device, the end portion of the lead wire connected to the relay pin is locked to the convex portion formed with the locking portion in the direction in which the centrifugal force is applied by the rotation of the core to connect to the relay pin. Therefore, there is no fear that the end of the lead wire will float up due to the centrifugal force generated by the rotation of the core, and the lifted end of the lead wire will interfere with the circuit element of the substrate on the rotating drum part, or the like. It is possible to eliminate the risk that the core of the stator side may come into contact with the core and cause damage.

The end of the lead wire 25 is connected to the relay pin 24.
Since detailed work such as passing under the planted hill portion 23 is unnecessary, the product can be easily assembled.

In the above embodiment, the relay terminal section 1
Nos. 8 and 22 are molded of resin, and there is no problem in forming the above-mentioned convex portions 19 and 27.

[0032]

According to the present invention, the end portion of the lead wire connected to the relay pin is locked to the convex portion formed with the locking portion in the direction in which the centrifugal force due to the rotation of the core is applied to the relay pin. Since the connection is made, there is no fear that the end of the lead wire will float up due to the centrifugal force generated by the rotation of the core, and the lifted end of the lead wire will not interfere with the circuit elements of the board on the rotating drum. , It is now possible to eliminate the risk of causing damage by contact with the core on the stator side.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an example of a rotary transformer device according to the present invention.

FIG. 2 is a configuration diagram of another example of the rotary transformer device according to the present invention.

FIG. 3 is a diagram for explaining a rotary head device.

FIG. 4 is a configuration diagram of a conventional rotary transformer device.

FIG. 5 is a diagram for explaining the explanation.

FIG. 6 is a configuration diagram of a conventional rotary transformer device.

FIG. 7 is a diagram for explaining the explanation.

[Explanation of symbols]

5, 24 Relay pin 12, 21 Rotor core 16,25 lead wire 17 groove 18,22 Relay terminal part 19, 27 convex 23 Hill 26 holes

Claims (3)

(57) [Claims] 1. A stator core around which a lead wire is wound,
In a rotary transformer device provided so as to face a rotor core around which a lead wire is wound, a relay pin is provided at least at an end of the rotor core, and a surface of the stator core and the rotor core facing each other is provided near the relay pin. A convex portion that forms a locking portion in a direction parallel to the direction and in which a centrifugal force is applied by the rotation of the rotor core is provided, and an end portion of the lead wire is locked to the convex portion to be connected to the relay pin. Rotary transformer device. 2. The rotary transformer device according to claim 1, wherein when the stator core and the rotor core are cylindrical, the convex portion is projected in the rotation axis direction of the rotor core. 3. The rotary transformer device according to claim 1, wherein when the stator core and the rotor core are plane facing type,
The rotary transformer device, wherein the convex portion is projected in the rotation direction of the rotor core.