JPH0877850A - Manufacture of shield magnet wire - Google Patents

Abstract

PURPOSE: To dispense with the installation of a shield member for shielding a magnetic circuit, where a magnet wire is incorporated, by having the magnet wire itself have a shielding function. CONSTITUTION: A draw-out bobbin 8, where a magnet wire 9 covered with a polyurethane film, and a winding bobbin 10 are arranged in atmosphere for vacuum process such as vacuum deposition, sputtering, ion plating, etc. The magnet wire 9 is coated with a metallic film while rotating the draw-out bobbin 8 and the winding bobbin 10 at the same time with operating the vacuum process.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a shield magnet wire, and more particularly to a magnetic head, an optical head,
The present invention relates to a method for manufacturing a shield magnet wire suitable for forming a shield layer on the surface of a magnet wire used for a small magnetic circuit such as a small coil.

[0002]

2. Description of the Related Art Conventionally, sensors using various magnetic circuits such as a magnetic head, an optical head, and a miniature relay,
Although actuators have been widely put into practical use, copper wires or copper alloy wires having extremely small wire diameters are used in these various magnetic circuits. In this case, in particular, since the magnetic circuit used as the sensor or the magnetic circuit arranged in the vicinity of the sensor functions as a circuit for processing a minute voltage, measures to protect the circuit against noise or prevent noise from being generated. It is necessary to take appropriate shielding measures.

[0003]

By the way, as a shield measure in the above-mentioned magnetic circuit, it is generally known that the use of a shield wire covered with a shield wire is an effective measure. However, especially in the case of a magnet wire for forming a small-sized magnetic circuit, the structure covered with the shielded wire as described above has not been realized due to manufacturing difficulties. For example, the technique disclosed in Japanese Patent Laid-Open No. 61-200604 describes a resin material used for a shield wire, but it assumes injection molding as a method for manufacturing the shield wire. However, it was difficult to reduce the thickness of the shield layer to several microns or less by the manufacturing method described in 1.

On the other hand, for example, the technique described in Japanese Utility Model Publication No. 41-515 is a technique relating to coating a magnet wire with a conductive paint layer, but a technique for coating the conductive paint layer is not shown. There wasn't. That is, as described above, since the magnet wire having the thin film shield layer has not been realized yet, as a shield measure for the magnetic circuit in the conventional technique, a special measure such as installing a shield plate for shielding the magnetic circuit is used. Had to be applied.
However, there is a problem in that the installation of the shield plate for shielding the magnetic circuit is not preferable in terms of the function and cost of the magnetic circuit from the viewpoint of miniaturizing the magnetic circuit.

[0005]

It is an object of the present invention to improve the disadvantages of the above-mentioned conventional example, and in particular, to make the magnet wire itself have a shield function, thereby eliminating the need for installing a shield member for shielding a magnetic circuit incorporating the magnet wire. It is an object of the present invention to provide a method for manufacturing the shield magnet wire described above.

[0006]

According to the present invention of claim 1, there is provided a feeding bobbin in which a magnet wire coated with an insulating layer is wound in an atmosphere of a vacuum process such as vacuum deposition, sputtering and ion plating. A winding bobbin is arranged, and a method of coating a metal or conductive carbon thin film while rotating each bobbin while operating a vacuum process is adopted. This aims to achieve the above-mentioned object.

According to the second aspect of the present invention, the magnet wire covered with the insulating layer is driven to pass through a conductive resin solution containing fine metal powder or conductive carbon powder, and then the electric furnace is used. The method of continuous drying is adopted. This aims to achieve the above-mentioned object.

According to a third aspect of the present invention, one roller is arranged in a state where one end is immersed in a conductive resin solution mixed with fine metal powder or conductive carbon powder, and the roller is brought into contact with one roller to rotate. In addition to providing the other roller, a magnet wire covered with an insulating layer is passed between a pair of rollers, and then continuously dried in an electric furnace. This aims to achieve the above-mentioned object.

[0009]

According to the present invention of claim 1, a magnet wire coated with an insulating layer is wound around a feeding bobbin arranged in an atmosphere of a vacuum process such as vacuum deposition, sputtering, and ion plating. Further, one end of the magnet wire unwound from the unwinding bobbin is connected to the winding bobbin arranged in the atmosphere of the vacuum process.
Next, the feeding bobbin and the winding bobbin are rotated. With the rotation of the feeding bobbin and the winding bobbin,
While the magnet wire unwound from the unwinding bobbin is wound around the winding bobbin, a metal or conductive carbon thin film is coated around the insulating layer covered with the magnet wire.

According to the second aspect of the present invention, when the magnet wire covered with the insulating layer is driven to run, the magnet wire passes through a conductive resin solution mixed with metal fine powder or conductive carbon powder. At this time, a conductive resin mixed with fine metal powder or conductive carbon powder is coated around the insulating layer covered with the magnet wire. After that, the conductive resin coated on the magnet wire is dried in an electric furnace.

According to the third aspect of the present invention, when the magnet wires covered with the insulating layer pass between the pair of rotating rollers which are in contact with each other, fine metal powder or conductive carbon powder is mixed. With one end immersed in a conductive resin solution, the fine metal powder or conductive carbon powder adhered to the rotating surface of one roller around the insulating layer covered by the magnet wire as the one roller was rotated. A conductive resin mixed with is coated. After that, the conductive resin coated on the magnet wire is dried in an electric furnace.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment and a second embodiment to which the present invention is applied will be described below with reference to the drawings.

(1) First embodiment. FIG. 1 is a schematic view of a manufacturing apparatus for forming a shield layer on a magnet wire in the first embodiment. Inside the sputtering chamber 1 which constitutes a sputtering device (not shown),
The lower member 2 and the upper member 3 are arranged at a predetermined interval, and on the upper surface of the lower member 2, two support shafts 4 and 5 are arranged at a predetermined interval. The support shaft 4 has a first
A guide roller 6 is rotatably supported, and a second guide roller 7 is rotatably supported on the support shaft 5.

Further, the pay-out bobbin 8 is rotatably arranged on one side of the positions where the lower member 2 and the upper member 3 are arranged, and the pay-off bobbin 8 is coated with a polyurethane film as an insulating layer. Fine wire diameter (eg diameter 3
A magnet wire 9 made of annealed copper wire is wound. A winding bobbin 10 is rotatably arranged on the other side of the lower member 2 and the upper member 3 arrangement position, and the winding bobbin 10 has a magnet wire 9 coated with a metal thin film described later. Is being wound up.

Feeding bobbin 8 and winding bobbin 10
Are configured to rotate by a predetermined drive mechanism (not shown) incorporated therein. When the feeding bobbin 8 and the take-up bobbin 10 rotate by the driving mechanism described above, the magnet wire 9 fed from the feeding bobbin 8 is held in a predetermined tension so as not to sag, and the first guide roller 6 and the first guide roller 6 2 It travels through the guide roller 7 and is wound around the winding bobbin 10.

Inside the sputtering chamber 1, the magnet wire 9 is fed from the feeding bobbin 8 and wound on the winding bobbin 10. This time,
The surface of the magnet wire 9 is coated with a metal thin film (ultra-thin film shield layer) made of, for example, copper by sputtering to have a predetermined thickness (for example, about 500 Å). That is, due to the nature of sputtering, the surface of the magnet wire 9 is appropriately coated with a thin metal film regardless of the thin wire diameter (for example, diameter 30 μm).

The coating for coating the magnet wire 9 is not limited to polyurethane, but may be polyester or polyesterimide. Also,
The thin film coated on the magnet wire 9 is not limited to the metal thin film made of copper, but may be a conductive carbon thin film. Moreover, the thickness of the thin film coated on the magnet wire 9 is not limited to the above-mentioned numerical values, and can be set to an arbitrary thickness by appropriately changing the sputtering time. Also, the magnet wire 9
The thin film coating is not limited to sputtering but may be vacuum deposition or ion plating.

Next, a method of manufacturing the shield magnet wire by the manufacturing apparatus in the first embodiment described above will be described.

Inside the sputter chamber 1, when the feeding bobbin 8 and the winding bobbin 10 each rotate by a built-in driving mechanism, the magnet wire 9 fed from the feeding bobbin 8 has a first guide roller 6 and a second guide roller. The bobbin 1 is made to travel through the winding bobbin 1 while being kept in a predetermined tension so as not to sag.
It is wound up to 0.

When the magnet wire 9 is running, the surface of the magnet wire 9 unwound from the unwinding bobbin 8 is coated with a thin metal film made of copper by sputtering to a predetermined thickness (for example, about 500 angstrom). After this, the magnet wire 9 coated with a metal thin film (shield magnet wire)
Is wound on the winding bobbin 10.

As described above, according to the first embodiment,
A thin metal film (ultra-thin film shield layer) can be rapidly and evenly coated on a magnet wire 9 having a small wire diameter, and the ultra-thin film shield layer can be set to an arbitrary thickness by changing the sputtering time. be able to. Further, the ultra-thin film shield layer as described above can be applied to magnet wires that are widely commercialized. Further, since the magnet wire 9 itself can have a shielding function as described above, when a magnetic circuit is formed by the magnet wire 9, it is not necessary to install a shield member for shielding the magnetic circuit as in the conventional case. The number of parts and cost can be reduced.

(2) Second embodiment. FIG. 2 is a schematic view of a manufacturing apparatus for forming a shield layer on a magnet wire in the second embodiment. From the magnet wire feeding portion (not shown), the diameter of the wire covered with a polyurethane film as an insulating layer is small (for example, diameter 30).
The magnet wire 20 made of micron) annealed copper wire is fed out. Further, on the downstream side of the above-mentioned magnet wire feeding portion, guide rollers 21 and 22 contacting each other and guide rollers 23 and 2 contacting each other.
4, guide rollers 25 and 26 that are in contact with each other, and guide rollers 27 and 28 that are in contact with each other are axially supported at a predetermined interval in the magnet wire traveling direction.

The guide rollers 21, 25, 27 are arranged at the same height position, and the guide rollers 22, 26, 28 are
They are located at the same height. In addition, the guide roller 2
3, 24 are arranged at positions lower than the guide rollers 22, 26, 28. Here, for example, the guide roller 2
3 is configured to be rotatable, and the other guide rollers 21 to 28 are provided.
Is configured to be rotatable. In this case, one or more of the upper guide rollers 21, 25, 27
It may be driven to rotate under a predetermined control. The magnet wire 20 fed from the magnet wire feeding portion is held by the guide rollers 21 to 28 while being held at a predetermined tension so that it does not sag, and is allowed to run to the right in the figure. ing.

A conductive resin solution tank 29 is disposed below the guide roller 23, and the conductive resin solution 30 (for example, butyral containing silver powder dissolved therein) is placed inside the conductive resin solution tank 29. The resin solution) is full. Further, the guide roller 24, which is in contact with the guide roller 23 described above, is arranged such that the lower portion thereof is immersed in the conductive resin solution 30 inside the conductive resin solution tank 29. As a result, the surface of the magnet wire 20 fed out through the guide rollers 21 and 22 is coated with the conductive resin attached to the rotating surface of the guide roller 24 as the guide rollers 23 and 24 rotate. It has become.

In this case, the above-mentioned butyral resin is dissolved in an organic solvent such as isopropyl alcohol,
By appropriately adding isopropyl alcohol to the conductive resin solution tank 29 filled with the conductive resin solution 30, the thickness of the conductive resin layer coated on the surface of the magnet wire 20 can be adjusted appropriately.

Further, between the guide rollers 25 and 26 and the guide rollers 27 and 28, there is arranged an electric furnace 31 which is energized by a predetermined power source. Guide roller 25,
The magnet wire 20 coated with the conductive resin layer that has traveled through 26 is passed through the inside of the electric furnace 31 and is sent to the magnet wire winding section (not shown) through the guide rollers 27 and 28. Has become. Inside the electric furnace 31, the conductive resin layer coated on the magnet wire 20 is dried. In this case, when the thickness of the conductive resin layer coated on the magnet wire 20 is further increased, the coating step in the conductive resin solution tank 29 and the electric furnace 31 are performed.
And the drying process in step 3 are repeated.

The coating for coating the magnet wire 20 is not limited to polyurethane, but may be polyester or polyesterimide. In addition, the conductive resin solution 30 filled in the conductive resin solution tank 29
Is not limited to a butyral resin solution in which silver powder is dissolved, but may be a resin solution in which a conductive metal such as silver powder is dissolved in a thermoplastic polyester resin or polyamide resin. By using such a resin solution, a self-bonding wire having a shield layer can be manufactured.

Next, a method of manufacturing the shield magnet wire by the manufacturing apparatus in the second embodiment described above will be described.

The magnet wire 20 is unwound from the magnet wire unwinding portion, and the running of the magnet wire 20 is started in a state where the magnet wire 20 is held at a predetermined tension so as not to sag through the guide rollers 21 to 28. When the magnet wire 20 that has started traveling passes between the guide rollers 23 and 24, since the lower portion of the guide roller 24 is immersed in the conductive resin solution 30 inside the conductive resin solution tank 29, the guide rollers 21, The guide roller 2 is attached to the surface of the magnet wire 20 fed out through the guide roller 2.
Along with the rotation of 3, 24, the conductive resin adhered to the rotating surface of the guide roller 24 is coated.

The magnet wire 20 coated with the conductive resin layer is passed through the inside of the electric furnace 31 via the guide rollers 25 and 26. When the magnet wire 20 coated with the conductive resin layer passes through the inside of the electric furnace 31, the conductive resin layer coated on the magnet wire 20 is dried in the electric furnace 31. After that, the magnet wire 20 coated with the conductive resin layer, which has undergone the drying process, is sent to the magnet wire winding portion via the guide rollers 27 and 28.

As described above, according to the second embodiment,
Similar to the first embodiment, the conductive resin layer can be quickly and evenly coated on the magnet wire 20 having a small wire diameter, and the conductive resin layer coated on the magnet wire 20 can be quickly coated. It can be dried. Further, since the conductive resin attached to the rotating surface of the guide roller 24 is coated on the magnet wire 20 as the guide roller 24 rotates, a conductive resin layer having an appropriate thickness can be formed on the magnet wire 20. it can.

Furthermore, according to the second embodiment, the conductive resin layer coated on the magnet wire 20 can be set to an arbitrary thickness by repeating the above-mentioned coating step and drying step. In addition, the conductive resin layer as described above can be applied to magnet wires that are widely commercialized. Further, since the magnet wire 20 itself can have a shield function as described above, when a magnetic circuit is formed by the magnet wire 20, it is not necessary to install a shield member for shielding the magnetic circuit as in the conventional case. The number of parts and cost can be reduced.

[0033]

As described above, according to the present invention of claim 1, a magnet wire is provided between the feeding bobbin and the winding bobbin arranged in the atmosphere of a vacuum process such as vacuum deposition, sputtering, ion plating. Since the metal wire or the conductive carbon thin film is coated while the bobbin is rotated while rotating the bobbin while the vacuum process is being operated, the magnet wire can be quickly and evenly coated with the metal or conductive carbon thin film. In addition, since the magnet wire is coated with a metal or conductive carbon thin film as described above, the magnet wire itself can have a shielding function, and thus, for example, when a magnetic circuit is formed by the magnet wire, the magnetic circuit shield There is no need to install a shield member for use, and the number of parts and cost can be reduced.

According to the second aspect of the present invention, the magnet wire covered with the insulating layer is driven to pass through the conductive resin solution containing the fine metal powder or the conductive carbon powder while running, and then the electric furnace. Since the magnetic wire is continuously dried at the same time, the magnet wire can be rapidly and evenly coated with the conductive resin, and the conductive resin coated on the magnet wire can be quickly dried. There is an effect that it can.

According to the third aspect of the present invention, one roller is disposed with its one end immersed in a conductive resin solution containing fine metal powder or conductive carbon powder, and one roller is brought into contact with the other roller. Since the magnet wire coated with the insulating layer is passed between the rotating roller and the other roller, the magnet wire is continuously dried in an electric furnace, so that the same effects as those of the inventions of claims 1 and 2 can be obtained. Since the conductive resin adhered to the rotating surface of the roller is coated on the magnet wire as one roller rotates, it is possible to form a conductive resin layer having an appropriate thickness on the magnet wire. Play.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a schematic configuration of a manufacturing apparatus for forming a shield layer on a magnet wire in a first embodiment to which the present invention is applied.

FIG. 2 is an explanatory diagram showing a schematic configuration of a manufacturing apparatus for forming a shield layer on a magnet wire according to a second embodiment of the present invention.

[Explanation of symbols]

 8 Feeding bobbin 9, 20 Magnet wire 10 Winding bobbin 23 Guide roller as the other roller 24 Guide roller as one roller 30 Conductive resin solution 31 Electric furnace

Claims (3)

[Claims] 1. A feeding bobbin wound with a magnet wire coated with an insulating layer and a winding bobbin are arranged in an atmosphere of a vacuum process such as vacuum deposition, sputtering, ion plating, etc., and the vacuum process is performed. A method for producing a shield magnet wire, which comprises coating a metal or conductive carbon thin film while rotating each bobbin while operating. 2. A magnet wire coated with an insulating layer is passed through a conductive resin solution containing fine metal powder or conductive carbon powder while being driven to run, and then continuously dried in an electric furnace. A method for manufacturing a shield magnet wire, characterized in that 3. One roller is arranged with one end immersed in a conductive resin solution mixed with fine metal powder or conductive carbon powder, and the other roller is rotated by contacting this one roller. A magnet wire covered with an insulating layer is passed between the pair of rollers while being provided,
After that, the method for producing a shield magnet wire is characterized in that it is continuously dried in an electric furnace.