JPS61179513A - Coil device - Google Patents

Abstract

PURPOSE:To prevent a terminal strip from being fused for avoiding defective welding between a terminal fixture and a coil terminal, by providing the terminal strip under the terminal fixture with a slot extending in the direction of the coil axis. CONSTITUTION:A terminal strip 1 is provided on a coil bobbin 2 by integrally shaping synthetic resin such that it is projected outward therefrom in the direction of the coil axis. Terminal fixtures 5 are attached on the terminal strip 1 with a sufficient distance from each other for ensuring mutual insulation. A cut-out piece 10 is raised from the upper face of each of the terminal fixtures 5 for engaging a terminal end 4 of a coil 3. A slot 11 extending along the coil axis is further provided in the terminal strip 1 under the cut-out and raised piece 10 so that a welding lower electrode 7 is inserted in the slot. The slot 11 is opened such that it is spaced from the outer periphery of the welding lower electrode 7 by about 0.5mm, and by 1mm or more in the direction of the coil axis. The coil bobbin 2 provided with the terminal strip 1 having such aperture is inserted into a welding fixing jig 8 and the welding lower electrode 7 is inserted into the slot 11 in the terminal strip 1. Spot welding is performed with a welding upper electrode 7 applied onto the cut-out and raised piece 10 of the terminal fixture 5 engaging the terminal end 4 of the coil.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to the structure of a synthetic resin terminal plate in a coil device such as a discharge lamp ballast in which a coil end is welded to a terminal fitting.

[Background of the invention]

Conventionally, a coil device formed by welding a coil end to a terminal fitting has a terminal 4 of a coil 8 wound around a molded synthetic resin coil bobbin 2 with a terminal plate 1 protruding in the coil axial direction, as shown in FIG. is fixed to the terminal fitting 5 provided on the terminal plate l, and the electrode 6 is inserted from above and below the terminal fitting 5 as shown in FIG.
and 7 were brought into contact and spot welded. When performing this spot welding, the coil bobbin 2 is inserted into the fixing jig 8Vc, and then the lower electrode 7 for welding is inserted through the electrode hole 9 provided in the terminal plate 1, and is brought into contact with the terminal fitting 5 to perform spot welding. However, since the terminal plate 1 is small especially in small discharge lamp ballasts, etc., the electrode hole 9 has a sufficient opening area.
Moreover, when inserting the coil bobbin 2 into the fixing jig 8, the lower welding electrode 7 may come into contact with the electrode hole 9 due to a slight dimensional error in the coil axial direction with respect to the fixed position. 10 due to heat generated during welding.
Since the temperature is around 0,000, the side wall of the electrode hole 9 melts and the molten substance adheres to the upper part of the electrode 7. While this state was repeated, there was no electrical continuity between the lower welding electrode 7 and the terminal fitting 5, resulting in frequent welding defects. As a countermeasure to this problem, it is conceivable to reduce the upper diameter of the lower welding electrode 7, but this cannot be realized because a minimum of 8 mmfB is required in terms of pressure and heat generation during welding. FIG. 6 is a plan view showing the terminal portion of the conventional coil device, and FIG. 7 is a front view showing the conventional example inserted into the fixing jig 8.

[Purpose of the invention]

An object of the present invention is to obtain a coil device that does not cause welding defects between terminal fittings and coil terminals.

[Summary of the invention]

In order to achieve the above object, the coil device according to the present invention has the following features:
In a coil device in which a terminal plate is integrally provided in the coil axis direction outside the coil bobbin molded from synthetic resin, and the terminal end of the coil wound around the coil bobbin is welded to the terminal fitting attached to the terminal plate, the lower part of the terminal fitting is By providing the terminal plate with a long hole in the axial direction of the coil, the terminal plate is prevented from melting during welding, thereby eliminating welding defects between the terminal fitting and the coil end.

[Embodiments of the invention] Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partial plan view showing one embodiment of the coil device according to the present invention, FIG. 2 is a detailed view of the electrode hole in the terminal plate of the above embodiment, and FIG. 3 is a diagram showing another embodiment of the present invention. FIG. In FIG. 1, this embodiment has a coil bobbin 2.
A terminal plate 1 protruding in the axial direction of the external coil is integrally provided by molding synthetic resin, each terminal fitting 5 is mounted on the terminal plate l with a sufficient distance for mutual insulation, and the upper surface of the terminal fitting 5 is A cut-out 10 for locking the terminal 4 of the coil 3 is provided in the terminal plate 1 under the cut-out 10, and an electrode hole 11 for inserting the lower electrode 7 for welding is provided on the coil shaft. It is provided as a long hole 11 that is long in the direction.

As shown in FIG. 2, the elongated hole 11 is opened at a distance of approximately 0.5 mm from the outer periphery of the lower welding electrode 7, and at least 1 mm in the axial direction of the coil.

The coil bobbin 2 provided with the terminal plate 1 having such an opening is inserted into the welding fixture 8, the lower electrode 7 for welding is inserted into the elongated hole 11 of the terminal plate l, and the terminal with the coil end 4 locked is formed. When spot welding is performed by placing the upper electrode 6 for welding on the cut and raised portion 10 of the metal fitting 5, the elongated hole 11 provided in the terminal plate 1 will be removed.
The opening was not melted and no welding defects occurred.

Another embodiment shown in FIG.
is provided so that it protrudes further toward the coil 3 side by about 0.5 mm from the end of the terminal fitting 10, and if there is a slight return when the coil bobbin 2 is inserted into a welding fixture, the fixation Since the spot welded electrode will be slightly closer to the coil 3 side, this embodiment is safer than the previous embodiment, and it is ensured that the electrode hole 11' will not melt due to the heat of welding. can be prevented. In actual application results, there were no welding defects caused by molten matter adhering to the electrode tip. In this embodiment, as described above, a minute gap is created in the terminal plate 1 of the terminal fitting 5 on the coil 3 side, but in this small gap, the melted solder when soldering to the terminal fitting 5 can be removed. It does not flow out to the bottom of the terminal plate 1. Note that the long holes 11 and 11
Even if ' is a cut hole opened on the opposite side of the terminal plate 1 from the coil 3, that is, opened outward, its operation and effect are exactly the same as in each of the above embodiments.

〔Effect of the invention〕

As described above, in the coil device according to the present invention, a terminal plate is integrally provided in the coil axis direction outside the coil bobbin molded from synthetic resin, and the terminal end of the coil wound on the coil bobbin is welded to the terminal fitting attached to the terminal plate. In the coil device, the terminal plate at the bottom of the terminal fitting is provided with an elongated hole in the coil axis direction, so that the lower electrode can be prevented from coming into contact with or extremely close to the elongated hole of the terminal plate during welding. As a result, the edge of the long hole mentioned above melts due to the heat of welding and adheres to the lower electrode.
No welding defects occur.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a partial plan view showing one embodiment of the coil device according to the present invention, Fig. 2 is a detailed view of the electrode hole provided in the terminal plate in the above embodiment, and Fig. 3 is a partial plan view showing an embodiment of the coil device according to the present invention. FIG. 4 is a partial plan view showing another embodiment of the present invention; FIG. 4 is a diagram showing the relationship between a conventional coil device and a fixing jig; FIG. 5 is a sectional view of the terminal portion of the coil device during welding; FIG. 7 is a plan view of the terminal portion of the coil device, and FIG. 7 is a front view showing the coil device inserted into the fixing jig. 1... Terminal board, 2... Coil pobin, 3... Coil, 4... Coil terminal, 5... Terminal fitting, 11, 11
'...Long hole.

Claims (1)

[Claims] In a coil device in which a terminal plate is integrally provided in the coil axis direction outside the coil bobbin molded from synthetic resin, and the terminal end of the coil wound around the coil bobbin is welded to the terminal fitting attached to the terminal plate, the lower part of the terminal fitting is A coil device characterized in that the terminal plate is provided with a long hole in the coil axis direction.