JPH03114208A - Surface mounting parts - Google Patents

Abstract

PURPOSE:To simply fix the end part of a coil to an electrode on the rear of a core with high precision, by forming grooves on the rear of a magnetic core, forming recessed parts in the middle parts of the grooves, and equipping the ring type core fixed on the periphery with an electrode so as to face the grooves. CONSTITUTION:Grooves 10a, 10b, 10c, 10d to which the end parts 3 of a coil 2 are temporarily fixed are formed on the rear 10 of a magnetic core. Electrodes 4, 5, 6, 7 to which the end parts 3 of the coil are connected so as to correspond with the grooves 10a, 10b, 10c, 10d are formed on the rear 12 of a ring type magnetic core 8 on the periphery of the magnetic core 1. The rear 10 of the magnetic core is equipped with recessed parts 11 in the middle parts of the grooves 10a-10d. Hence the end parts of the coil can be simply fixed with high precision when a wire is wound around the magnetic core.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to a surface-mounted component that is used by being surface-mounted on a printed wiring board on which an electric circuit pattern is formed.

2. Description of the Related Art Conventionally, this type of surface-mounted component, such as a transformer, has had a structure as shown in FIG. In FIG. 2, (2) (1), 1 is a core made of a magnetic material, 2 is a coil wound around this core 1, and has a terminal 3. 4.5.6, 7 are electrodes formed on the back surface of the core 1, and the terminals 3 of the coil 2 wound around the core 1 are fixed to the electrodes 4, 5, 6.7. A ring-shaped core 8 is made of a magnetic material and is fixed around the core 1.

Problems to be Solved by the Invention In such a conventional configuration, there was a problem in that it was difficult to attach the terminal of the coil to the electrode on the back surface of the core with high precision. When winding the wire around the core, the terminal must be fixed near the electrode on the back of the core, which complicates the structure of the winding machine.Especially when winding multiple coils, the terminals must be attached one by one. There was also the problem that it was difficult to make because it was necessary. There is also a problem in that when a completed surface-mount component is mounted on a printed wiring board, it is very difficult to confirm whether the terminals are reliably soldered to the electrode portions of the printed wiring board.

The present invention aims to make surface mount components using magnetic cores easy to attach to the electrodes on the back surface of the core with good accuracy (and to easily attach the ends of the coils to the electrodes on the back surface of the cores). The purpose is to easily check whether the electrodes have been soldered securely (by rubbing).

Means for Solving the Problems In order to solve this problem, the present invention provides a groove on the back surface of the magnetic core, and a recess in the middle of the groove.
Further, a ring-shaped magnetic core fixed around the periphery is provided with an electrode facing the groove.

With this configuration, the end of the coil is temporarily fixed to the groove on the back surface of the magnetic core, and then the end of the coil is fixed to the magnetic core at the same time when the ring-shaped magnetic core is fixed around the magnetic core. Because of this, the positioning accuracy of the coil terminal is good.Also, when winding the wire around the magnetic core, the end of the coil is temporarily installed in the groove, and after winding the wire, a ring-shaped ring is placed around the magnetic core. When fixing the magnetic core, the position of the end of the coil is fixed at the same time, and then the end of the coil is cut in the recess provided in the middle of the groove, and the end of the coil is connected to the electrode of the ring-shaped magnetic core. It is easy to install because it can be bent to the side and the end of the coil and the electrode can be fixed with solder or conductive resin.

Embodiment FIG. 1 is a perspective view of a surface-mounted component of a transformer according to an embodiment of the present invention, and portions i in FIG. 1 that are the same as those in FIG. 2 are given the same numbers.

Reference numeral 10 denotes the back surface of the magnetic core, and the back surface 10 of this core has grooves 10a and 10b in which the terminal 3 of the coil 2 is temporarily fixed.
, 10c, 10d are provided, and grooves 10a, 10b,
Electrodes 4 and 5°6.7 to which the ends 3 of the coils are connected are formed corresponding to 10c and 10d. A recess 11 is provided on the back surface 10 of this magnetic core at the middle of the grooves 10a to 10d.

With this configuration, when winding the electric wire around the magnetic core, the end of the coil can be easily attached with high precision.

Effects of the Invention As described above, according to the present invention, a groove is provided on the back surface of the magnetic core, and a recess is provided in the middle of the groove, so that when the electric wire is wound around the magnetic core, the end of the coil temporarily falls into the groove. After winding the wire and fixing the ring-shaped magnetic core around it, the end of the coil can be fixed to the magnetic core at the same time. The wire can be broken at the concave part of the coil, and then the end of the coil can be bent toward the electrode side of the ring-shaped magnetic core, and the end and electrode can be fixed with solder or conductive resin, making it easy to attach with precision. You can get the effect that you can.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing a transformer according to an embodiment of the present invention, and FIG. 2 is a perspective view showing a conventional transformer. 1... Core, 2... Coil, 4, 5,
6.7... Electrode, 8... Ring-shaped core, 10... Core back surface, 10 a, 10 b
, 1・Oc, 10 d =−...groove, 11・
・・・・・・Concavity.

Claims (2)

[Claims] (1) An electric wire is wound around a magnetic core having a groove on the back surface and a recess deeper than the depth of the groove in the middle of the groove, and a ring-shaped magnetic core attached to the outer periphery of the magnetic core. A surface mount component in which an electrode is provided corresponding to the groove, and an end of the electrode is attached to the electrode. (2) The surface mount component according to claim 1, wherein the ring-shaped magnetic core has grooves in opposing electrode portions on the back surface thereof.