JPH11176663A - Face mounting type of coil component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent wire breaking of a terminal of winding caused by bending, by improving solder wettability of wrapping part of the metallic lead terminal and the winding terminal of a face mounting type of coil component, and also, increasing the mechanical strength of this wrapping part, and to lessen external form dimension of the coil part at large by shortening the length dimension of the wrapping part. SOLUTION: In a metallic lead terminal 4 constituted of an electrode part 4a bonded to the bottom of the under collar 2b of a drum core 1 and connected to the conductive part of a printed board and a wrapping part 4b projected from the peripheral flank of the collar 2 of the drum core 1 and used for wrapping and connecting the terminal 3a of the winding led out of the winding 3, the wrapping part 4b is made in the shape of a recess such as, for example, V form, circular form, or the like, and it is projected outward from the peripheral flank of the under collar 2b of the drum core 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount type coil component, and more particularly to a metal lead terminal of the surface mount type coil component.

[0002]

2. Description of the Related Art Conventionally, a surface mount type coil component to which a metal lead terminal is attached is, for example, as shown in FIG.
And a lower core 2b, and a drum core 1 having a winding 3 wound between the flanges and a metal lead terminal 4 formed in a step shape. The metal lead terminal 4 is a bottom surface of the lower flange 2b of the drum core 1. Electrode portion 4a that is bonded to the conductive portion of the printed circuit board and that is connected to the conductive portion of the printed circuit board.
3a of winding 3 wound around (hereinafter referred to as winding terminal)
And the binding portion 4b to be connected.

[Problems to be solved by the invention]

FIG. 2 shows a step of soldering the winding terminal 3a connected to the binding portion 4b of the metal lead terminal 4 in the surface mount type coil component having the above-mentioned structure. Reference numeral 6 denotes a soldering jig. With this configuration, the surface mount type coil component is attached to the soldering jig 6 such that only the entangled portion 4b of the metal lead terminal 4 to which the winding terminal 3a is entangled is soldered. Thus, since the shape of the metal lead terminal 4 is merely punched out of a metal flat plate and bent in a step shape, the cross-sectional shape of the binding portion 4b also becomes planar,
There is a disadvantage that the wettability at the time of soldering to the winding terminal 3a is deteriorated, and poor adhesion is likely to occur. For this reason, conventionally, in order to improve the solder wettability, the length of the entangled portion 4b immersed in the solder bath 5 via the solder jig 6 has been increased. There has been a drawback that the wire ends are apt to be broken, and the shape of the entire coil component becomes large.

[Means for Solving the Problems]

According to the present invention, in order to solve the above-mentioned conventional disadvantages, a winding is wound around a core, and an electrode portion to be soldered to a printed circuit board or the like and a terminal of the winding are soldered to a flange portion of the core. In the surface-mount type coil component to which the metal lead terminal including the entangled portion is attached, the entangled portion of the metal lead terminal is formed in a concave shape and is projected outward from the peripheral side surface of the flange portion of the core. By forming the entangled portion in a concave shape, the solder wettability is improved and the mechanical strength of the entangled portion is increased to prevent disconnection of the winding terminal due to bending, and Is shortened to reduce the outer dimensions of the entire coil component.

BEST MODE FOR CARRYING OUT THE INVENTION

An embodiment of the present invention will be described using an example. 3A and 3B are explanatory views showing one embodiment of the surface mount type coil component of the present invention. FIG. 3A is a front view, and FIG. 3B is an enlarged perspective view showing an example of a metal lead terminal. The code is attached. In each of the drawings, the drum core 1 includes an upper flange 2a and a lower flange 2b, and a winding 3 is wound between the two flanges. Reference numeral 4 denotes a metal lead terminal, which is adhered to the bottom surface of the lower flange 2b of the drum core 1 and is connected to the conductive portion of the printed circuit board.
Winding terminal 3a protruding from the peripheral side surface of the winding and derived from winding 3
The binding portion 4b is formed in a concave shape such as a V-shape or a semicircular shape, and is formed from the peripheral side surface of the lower flange 2b of the drum core 1. It protrudes outward. In the step of soldering the winding terminal 3a to the binding portion 4b of the metal lead terminal 4 in the above-described configuration, the binding portion 4b having the winding terminal 3a connected to the molten solder of the solder bath 5 is similar to the conventional example of FIG. This is performed by attaching the coil component to the solder jig 6 so as to be perpendicular to the liquid surface, and immersing the entangled portion 4b in the molten solder liquid.

【The invention's effect】

Here, the binding portion 4b is formed in a concave shape, and the winding terminal 3a is wound so as to surround the space 5 formed in the concave portion of the binding portion 4b. The penetration of the liquid has the effect of improving the wettability of the solder. Further, the lower collar 2b
The length of the binding portion 4b protruding outward from the peripheral side surface can be shortened, and the outer dimensions of the entire coil component can be reduced. Furthermore, since the binding portion 4b is formed in a concave shape, the mechanical strength is increased, and it is difficult to bend, so that disconnection of the winding end can be prevented.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conventional surface mount type coil component (a).
Is a side view, (b) is a front view, and (c) is a perspective view of a metal lead terminal.

FIG. 2 is an explanatory view showing a step of soldering a winding terminal of a conventional surface mount type coil component.

3A and 3B are explanatory views showing one embodiment of the surface mount type coil component of the present invention, wherein FIG. 3A is a front view, and FIG. 3B is a perspective view of a metal lead terminal.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Drum core 2a ... Upper flange 2b ... Lower flange 3 ... Winding 3a ... Winding terminal 4 ... Metal lead terminal 4a ... Electrode part 4b.
..Tying part 5 ... Soldering tank 6 ... Soldering jig 7 ...
・ Space

Claims (1)

[Claims] A metal lead terminal comprising an electrode portion soldered to a printed circuit board or the like and a binding portion to which a terminal of the winding is soldered is wound around a core. In the mounted surface mount coil component, the binding portion of the metal lead terminal is formed in a concave shape and protrudes from a peripheral side surface of the flange portion.