JP4253151B2 - Method for manufacturing antenna coil - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates primarily non-contact IC card, a process for preparation of suitable A antenna coil to form means in particular antenna coil.
[0002]
[Prior art]
Usually, an antenna coil of a non-contact card is formed by etching copper foil, printing with a conductive paste, magnet wire, or the like. When these antenna coil forming means are compared, the method using a magnet wire has the lowest material cost.
[0003]
When an antenna coil is formed with a magnet wire, there are a method of embedding by an ultrasonic wave, a heat embedding of a heat softening resin, and a method of embedding a magnet wire by energization heating. FIG. 7 is a diagram showing a wire embedding process by ultrasonic embedding according to the prior art. From FIG. 7, the embedding by the ultrasonic wave has a limitation in the embedding speed because the magnet wire 11 is embedded while applying the ultrasonic vibration of the ultrasonic horn 22 to the nozzle 21 and tracing on the sheet. It takes 10 seconds. Furthermore, the ultrasonic horn 22, the ultrasonic transducer drive circuit 23, and the like are expensive, resulting in an expensive apparatus configuration with low processing capability, and the manufacturing cost of the antenna coil increases.
[0004]
FIG. 8 is a diagram showing a pre-process of a wire embedding process using a thermosoftening resin. Moreover, FIG. 9 is a figure which shows the post process of the wire embedding process using a thermosoftening resin. A magnet wire is wound around the antenna coil 14 in a separate stage, and the antenna coil 14 is wound. On the other hand, the sheet 12 coated with the thermosoftening resin 31 is preheated on a thermal surface plate 32. As shown in FIG. 8, the antenna coil 14 is pressed against the preheated thermosoftening resin 31 to transfer the antenna coil 14.
[0005]
Thereafter, as shown in FIG. 9, the antenna coil 14 is formed by peeling off the antenna coil 14 from the thermosoftening resin 31. The heat softening resin 31 suitable for fixing the antenna coil 14 is preferably one having adhesiveness when heated, and an expensive resin is inevitably used. For this reason, there is a limit in reducing the manufacturing cost.
[0006]
The energization heating of the magnet wire can be embedded in an energization time of 1 second or less, and no auxiliary material is required. Therefore, the formation cost of the antenna coil can be reduced most. In forming the antenna coil by energization heating, the simplest method is to press a sharp conducting blade against the magnet wire with a constant load to break the coating and establish conduction.
[0007]
FIG. 10 is a diagram showing a conductive blade used for conventional energization heating.
[0008]
[Problems to be solved by the invention]
As shown in FIG. 10, in the case of a method for manufacturing an antenna coil using a conductive blade, in order to apply a load to the conductive blade 41, a pressurizing spring 42 or the like is separately installed and the conductive blade 41 is pressed. In addition, it is necessary to separately install the conductive blade 41 and the power supply wiring 43. When a magnet wire having a diameter of about 0.10 mm is attracted to Umeko energized, an appropriate energizing current is 10 to 15 A, and the thickness of the wiring is required to be 2.0 mm ² or more in nominal cross-sectional area. (From the Ministry of International Trade and Industry Notification No. 271-1965 revised from the Ministry of International Trade and Industry Decree No. 440-1968) Since the conductive blade 41 and the wire 43 are mechanically coupled by the shaft 45 passing through the guide bush 44, the wire 43 is bent. The strength greatly affects the pressing load of the conductive blade 41.
[0009]
Accordingly, an object of the present invention, it is possible to eliminate the contact load variations due to bending strength of the wiring to the cutting edge, to provide a production method of easily and stably can be performed luer antenna coil energization buried It is.
[0010]
[Means for Solving the Problems]
The above problem is solved by using a conductive blade having a sharp blade on the end face of the metal plate and having one or more cuts parallel to the blade. Further, by forming the metal plate with a metal containing molybdenum or tungsten, a conductive blade having both blade edge strength and spring property can be obtained.
[0014]
That is , the present invention breaks the coating of the magnet wire on the end face of the metal plate and has a sharp blade for conducting to the magnet wire, and is parallel to the blade edge of the blade at the intermediate portion of the metal plate. A method of manufacturing an antenna coil in which the antenna coil is fixed in a resin by pressing the blade against the antenna coil and energizing the conduction pressing jig having one or more cuts.
[0015]
Further, the present invention is the above- described method for manufacturing an antenna coil, wherein the metal plate of the conduction jig is held between two pressing plates and moves finely inside.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
A conduction pressing jig and an antenna coil manufacturing method according to an embodiment of the present invention will be described below.
[0017]
FIG. 1 is a perspective view of a conduction pressing jig according to an embodiment of the present invention. The conduction pressing jig is made of a material having high strength and high hardness such as molybdenum and tungsten. This is because, when the coating of the magnet wire is broken with the cutting edge 2 at the tip of the conduction pressing jig 1, a large current flows through the cutting edge 2 when energized, the contact portion becomes high temperature, This is to prevent the blade edge 2 from being damaged. In addition to the molybdenum and tungsten, a welding electrode material such as a copper tungsten alloy, a silver tungsten alloy, or tungsten carbide is suitable. In addition, these alloys have a relatively high elastic limit, and have an advantage of easily imparting spring properties by devising a conductive blade structure.
[0018]
The blade edge 2 of the conduction pressing jig is ground so that the blade edge angle is about 90 °. The cuts 3a to 3f are provided in parallel with the cutting edge, and the displacement-load characteristic of the cutting edge 2 can be arbitrarily set (spring constant) by installing the plurality of cuts 3a to 3f. It is clear that the elastic deformation portions 4a to 4e formed by the cuts 3a to 3f can easily obtain a cross-sectional area that allows an energization current by adjusting the interval between the cuts 3a to 3f. The hole 5 is used for fixing the conductive blade, and the terminal 7 of the wiring 6 is fastened together with the fixing bolt 8.
[0019]
FIG. 2 is an explanatory view of elastic deformation of the conduction pressing jig according to the embodiment of the present invention. From FIG. 2, elastic deformation occurs when the conduction pressing jig 1 comes into contact with the magnet wire 11, and the cuts 3 a to 3 f are alternately arranged. Therefore, the displacement of the blade edge 2 becomes almost vertical, and the blade edge Longitudinal displacement is minimal.
[0020]
FIG. 3 is a side view of the unit of the conduction pressing jig according to the embodiment of the present invention. FIG. 4 is a front view of the unit of the conduction pressing jig according to the embodiment of the present invention. FIG. 5 is a perspective view of the unit of the conduction pressing jig according to the embodiment of the present invention. Here, since the block 9 and the pressing plate 10 for fixing the conduction pressing jig rub against the side surface of the conduction pressing jig 1 having high hardness, hardened steel or the like is used to suppress displacement of the conduction blade in the plate thickness direction. Thereby, the position of the blade edge | tip 2 of the press jig | tool 1 for conduction | electrical_connection can be positioned correctly.
[0021]
FIG. 6 is a perspective view of a winding jig incorporating a unit of a conduction pressing jig according to an embodiment of the present invention. As shown in FIG. 6, the conduction pressing jig 1 is incorporated in the winding jig 13. With such a structure of the conduction pressing jig 1, the embedded current can pass through the elastic deformation portions 4 a to 4 e even if the cutting edge 2 comes into contact with the magnet wire 11 and is displaced. Further, since wiring to the blade edge 2 is unnecessary, there is no influence of the wiring on the contact load of the blade edge 2, and the structure around the conductive blade 1 is greatly simplified.
[0022]
【The invention's effect】
As described above, according to the present invention, it is possible to eliminate the contact load variations due to bending strength of the wiring to the cutting edge, the energization embedding can be performed easily and stably luer antenna coil manufacturing method of Can provide.
[Brief description of the drawings]
FIG. 1 is a perspective view of a conduction pressing jig according to an embodiment of the present invention.
FIG. 2 is an explanatory view of elastic deformation of a conduction pressing jig according to an embodiment of the present invention.
FIG. 3 is a side view of a unit of a conduction pressing jig according to an embodiment of the present invention.
FIG. 4 is a front view of a unit of a conduction pressing jig according to an embodiment of the present invention.
FIG. 5 is a perspective view of a unit of a conduction pressing jig according to an embodiment of the present invention.
FIG. 6 is a perspective view of a winding jig incorporating a unit of a conduction pressing jig according to an embodiment of the present invention.
FIG. 7 is a diagram showing a wire pressing process by ultrasonic embedding according to the prior art.
FIG. 8 is a diagram showing a pre-process of a wire pressing process using a heat-softening resin according to the prior art.
FIG. 9 is a view showing a subsequent process of a wire pressing process using a heat softening resin according to the prior art.
FIG. 10 is a diagram showing a conventional conductive blade by energization heating.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pressing jig for conduction 2 Cutting edges 3a to 3f Cuts 4a to 4e Elastic deformation part 5 Fixing hole 6 Wiring 7 Terminal 8 Fixing bolt 9 Block 10 Holding plate 11 Magnet wire 12 Sheet 13 Winding jig 14 Antenna coil 21 Nozzle 22 Ultrasonic Horn 23 Ultrasonic vibrator drive circuit 31 Thermosoftening resin 32 Thermal surface plate 41 Conductive blade 42 Pressure spring 43 Wiring 44 Guide bush 45 Shaft

Claims (2)

 The end face of the metal plate has a sharp blade for breaking the magnet wire coating and connected to the magnet wire, and has at least one notch parallel to the blade edge of the blade in the middle portion of the metal plate. A method for manufacturing an antenna coil, wherein the antenna coil is fixed in a resin by pressing the blade against the antenna coil and energizing the pressing jig for conduction. 2. The method of manufacturing an antenna coil according to claim 1 , wherein the metal plate of the conduction jig is held between two pressing plates and is finely moved inside.

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