JPS616818A - Manufacture of coil device - Google Patents

Abstract

PURPOSE:To prevent lowering of insulation property without deteriorating weldability with simplified structure through welding by supplying a welding current under the condition that the one of a pair of welding electrodes pressurizingly in contact with the tongue piece so that a coil material is held by them and the other to the front end edge of terminal. CONSTITUTION:A coil material covered with insulator such as polyester is wound around a bobbin body 1 in order to form a coil 11. The coil material 11a in the winding start side is housed in the groove 6a at the upper surface of extruded part 6, the end portion thereof is arranged between a body 9 of terminal 8 and a tongue piece 10, and the coil material 11b of the winding end side is crossing three-dimensionally the coil material 11a of winding start side and is arranged between the body 9 and tongue piece 10 of terminal 8. Under this condition, the first welding electrode 12 is pressurizingly in contact with the tongue piece 10 and the second welding electrode 13 with a bending portion 9a at the front edge of terminal 8 so that the coil material 11 is held between the body 9 and tongue piece 10. When a welding current is applied, the insulator is eliminated by burning and the coil material 11a is welded to the terminal 8.

Description

[Detailed Description of the Invention] [Industrial Application Field] The invention relates to a method for manufacturing a coil device, and in particular to a method for welding a terminal of a coil wire in a coil device applied to a discharge lamp ballast. It is something that

[Prior art]

Generally, this type of coil device is an insulating bobbin, such as a bobbin f poly J stell, which has flanges at both ends of a cylindrical bobbin body, and a terminal is implanted in one flange so as to protrude from the outside. Winding the coated coil wire, winding the coil wire @starting end.

It is constructed by soldering the ends such as the end of the winding to terminal r.

By the way, before soldering the coil wire to the terminal,
When soldering a coil wire, the insulation coating in the planned area is removed by using a stripping agent or by rinsing it with a mechanical tool. The problem is that automation is difficult.

Therefore, in order to solve this problem, for example, Japanese Patent Publication No. 58-11094 discloses a coil in which a molded bobbin with a terminal having a tongue piece implanted on the outer surface of the flange part is coated with an insulating coating such as polynistil. As the wire continued to be wound, the end of the fill wire was held between the tongues of the terminal, and a pair of welding electrodes were brought into pressure contact with the upper and lower surfaces of the terminal so that the fill wire was held under pressure. A method for manufacturing a coil device is disclosed in which the coil wire is welded to the terminal while the insulation coating is burnt out by passing a welding current through each welding electrode.

According to this method, the insulation coating can be burnt off simply by passing welding current while the end of the coil wire is held between the welding electrodes via the tongue piece, so that workability can be significantly improved. - Excellent effects such as the possibility of complete automation are expected.

[Problem that the invention seeks to solve]

However, in the above-mentioned coil device, the terminal of the bobbin is arranged so as to protrude outward from the 7-rung part, so when the core is attached to this coil device, the bottom surface of the end terminal is opposite to the core. I come to do it. Therefore, if you solder a lead wire to a terminal in order to integrate it into the main body of a device and make electrical connections with other parts, some solder may drip from the terminal and approach the core. )cormorant. For this reason,
A new problem arises in that the insulation against the core of the terminal is impaired.

Therefore, an object of the present invention is to provide a coil device which can prevent the deterioration of insulation properties caused by soldering of the lead wire of an external circuit to the terminal without impairing the weldability of the coil wire to the terminal with a simple structure. Our goal is to provide manufacturing methods.

[Means to solve the problem]

Therefore, in order to achieve the purpose of the child connection, the present invention forms a protrusion on the outer surface of one of the seven rungs of a bobbin that has seven rungs at both ends, and attaches a terminal having a tongue piece to this protrusion on the lower surface. is installed so that it does not open, and a coil wire coated with polyester or other insulating material is wound around this bobbin, and after positioning the end of the coil wire at the terminal part, a pair of welding i! The coil wire is welded to the terminal by supplying welding current with one side of the pole in pressure contact with the front edge of the terminal so that the coil wire is held between the tongues. It is something to do.

[Effect]

According to this invention, after the end of the coil wire is positioned on the terminal that is attached to the bobbin protrusion so that the lower surface is not exposed, one of the pair of welding electrodes is used as the terminal, and the coil wire is inserted with the tongue 8V. The other end is brought into pressure contact with the front edge of the terminal so as to be held in place, and a welding current is applied in this state to burn away the insulation coating of the coil wire and weld the coil wire to the terminal. . In particular, since the lower surface of the terminal is closed by the protrusion, it is possible to prevent the insulation from deteriorating due to soldering of the lead wire to the terminal with the core attached.

〔Example〕

Next, an example of application of the present invention to a discharge lamp ballast is shown in Figs.
This will be explained with reference to FIG.

First, as shown in FIGS. 1 and 2, the rectangular cylindrical bobbin main body 10 has a Vtc and a first Vtc at both ends. A second seven-lung portion 2° 3 is formed, and a protruding portion 6 having recesses 4 and 5 opening upward and outward in the axial direction of the bobbin body 1 is formed on the outer surface of the first flange portion 2. The terminal 8 is inserted into the recesses 4 and 5 of the bobbin 7.
, 8 are grooves 4a, 5a formed in the side walls of the recesses 4, 5.
Attach using. The terminal 8 is constructed by forming eleven tongue pieces 10 on a flat plate-shaped main body 9 having, for example, a diagonally upwardly bent portion 9a at the front end edge.
Care has been taken to ensure that the bottom surface does not open when installed. In this state, a coil wire material having an insulating coating such as polyester is wound around the bobbin body 1, and the coil 1
form 1. Then, the coil wire material 11a on the winding start side
is housed in the groove 6a on the upper surface of the protrusion 6, the end of which is disposed between the main body 9 of the terminal 8 and the tongue 10, and the fill wire 11b on the winding end side is connected to the coil wire 11a on the winding start side. The main body 9 and the tongue l of the terminal 8 are arranged three-dimensionally and alternately.
It is placed between O. In this state B, the second welding die M 13 is attached to the front edge of the terminal 8 so that the first welding electrode 12 is placed on the tongue lO, and the coil wire 11a is held between the main body 9 and the tongue 10. The bent portions 9a [are brought into pressure contact with each other]. Then, by applying a welding current, the insulation coating is burnt out and peeled off, and the coil wire 1
1a is welded to the terminal 8. Incidentally, the same welding operation is performed for the other terminal r. Next, as shown in FIG. 3, for example, an E-shaped core 14.1 is attached to the bobbin 7 in the coil device.
Attach 4. Next, as shown in FIG. 4, the lead wire 15 is soldered (16) to the terminal 8.

〔Effect of the invention〕

As described above, according to the present invention, when welding the end of the fill wire to the terminal, the second (other) welding electrode is brought into pressure contact with the front edge of the terminal, and the welding electrode is placed on the lower surface of the terminal. There is no need to form an opening in the protrusion for contact with the
This allows the terminal to be made smaller, and furthermore, the bobbin to be made smaller. Also, since the terminal is attached to the protruding part of the bobbin in such a way that the bottom surface of the terminal is not opened (installed), even if the lead wire is soldered to the terminal after the core is attached to the bobbin, the solder around the terminal It can reduce dripping. Due to this stiffness, it is possible to improve the deterioration of the insulation property of the terminal with respect to the core. In particular, if a diagonally upwardly bent portion is formed on the front end edge of the terminal, dripping of solder can be completely eliminated, and deterioration in insulation properties caused by this can be reliably prevented.

In addition, in the present invention, the coil device can be applied to electromagnetic devices other than discharge lamp ballasts, and the terminal shape and the structure for attaching the terminal to the protruding part can be changed as appropriate without being restricted to the above embodiments. can.

[Brief explanation of the drawing]

The drawings are explanatory diagrams of the method of the present invention, in which Fig. 1 is a plan view showing how the coil wire is wound around the bobbin, and Fig. 2 is a main part for explaining the method of welding the coil wire to the terminal. side sectional view,
Fig. 3 is a plan view showing the state in which the core is attached to the bobbin, and Fig. 4 is a side sectional view of the main part showing the state in which the terminal (F IJ- wire is soldered). In the figure, 2 and 3 are 7 rung part, 6 is a protruding part, 7 is a bobbin,
8 is a terminal, 10 is a tongue piece, 11 is a coil, 11a, 1
lbi coil wire, 12.13 is a welding electrode. Patent applicant: Nippon Electric Co., Ltd., -1° Figure 1 Figure 2

Claims (2)

[Claims] (1) A protrusion is formed on the outer surface of one flange of a bobbin that has flanges on both ends, and a terminal with a tongue piece is attached to this protrusion so that the bottom surface does not open. After winding the insulating coated coil wire and positioning the end of the coil wire on the terminal part, one of the pair of welding electrodes is used as a tongue, and the other is placed so that the coil wire is held between the tongues. By supplying welding current with the terminals in pressure contact with the front edge of the terminal,
A method for manufacturing a coil device, characterized by welding a coil wire to a terminal. (2) The method for manufacturing a coil device according to claim 1, wherein the front edge of the terminal is slightly bent upward.