JP2001093746A - Surface mount coil bobbin and coil - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coil bobbin structure which minimizes the surface mount area by placing coil terminals within the projection area of the coil bobbin body and is suited for arc-welding the terminal wires to the coil terminals. SOLUTION: Coil terminals 14 and surface mount terminals 13 are separated attached to a coil bobbin body 11 and the coil terminals 14 and the surface mount terminals 13 are electrically connected, at least the coil terminals 14 are disposed within the projection area of the coil bobbin body 11, the coil terminals 14 are structured such that they are provided in a recess 15 formed into the mounting bobbin surface of the bobbin body 11 and are not projected below the surface mount terminals 13.

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 bobbin and a coil used for a vibrating device for detecting an incoming call of a mobile communication device.

[0002]

2. Description of the Related Art In recent years, surface mount coil bobbins have been widely used as electronic devices become smaller and thinner. Also,
For connection between the coil bobbin terminal and the winding wire, joining by soldering is often used. In soldering, there is a concern that melting of coil bobbin resin due to melting temperature, etc. and lead contained in solder may cause environmental pollution and adverse effects on the human body, and joining by arc welding is also used to avoid them. (Japanese Patent Laid-Open No. Hei 11
-15637).

FIG. 3 shows a conventional example of a surface mount type coil bobbin used for a vibrating device for detecting an incoming call of a mobile communication device. In this figure, 1 is a coil bobbin main body, 2 is a winding wound around the outer periphery of the coil bobbin main body, 2a is its terminal wire, 3 is a surface mounting terminal, and 4 is a winding electrically connected to the surface mounting terminal. It is a terminal for wire binding.

As shown in the conventional example of FIG. 3, the terminal of the surface mount type coil bobbin has a projected area viewed from above the coil bobbin main body (a substrate hidden by the coil bobbin main body when the surface mount type coil bobbin is mounted on a substrate to be mounted). Area). In particular, the joining method by soldering has a structure in which the winding binding terminals 4 projecting beyond the projected area of the bobbin main body 1 as shown in FIG. That is,
Both the surface mounting terminal 3 and the winding binding terminal 4 protrude beyond the projected area of the coil bobbin main body 1. Therefore, the surface mounting area of the entire coil bobbin with respect to the mounting board surface is
Generally, it is much larger than the projected area of the coil bobbin main body.

[0005]

SUMMARY OF THE INVENTION In view of the above, it is a first object of the present invention to arrange terminals for winding winding within a projected area of a coil bobbin main body to minimize a surface mounting area, An object of the present invention is to provide a surface mount type coil bobbin having a coil bobbin structure suitable for joining a terminal wire to a winding binding terminal by arc welding.

A second object of the present invention is to arrange the terminal for winding winding within the projected area of the coil bobbin body to minimize the surface mounting area, and to arc-weld the terminal wire to the terminal for winding winding. And to provide a surface-mounted coil which eliminates inconvenience caused by soldering.

[0007] Other objects and novel features of the present invention will be clarified in embodiments described later.

[0008]

In order to achieve the above object, a surface mount type coil bobbin according to the present invention comprises a coil bobbin main body, a winding winding terminal and a surface mounting terminal are separately provided, and The binding terminal and the surface mounting terminal are electrically connected, and at least the winding binding terminal is arranged within a projected area of the coil bobbin main body.

In the surface mount type coil bobbin, the terminal for winding winding is provided in a concave portion formed on the bottom surface on the mounting side of the coil bobbin main body, and does not protrude below the surface mount terminal. It is good.

In the surface mount type coil according to the present invention, the coil winding terminal and the surface mounting terminal are separately provided on the coil bobbin main body, and the winding winding terminal and the surface mounting terminal are electrically connected. Being connected, at least the terminal for winding winding is arranged within the projected area of the coil bobbin main body, and a terminal wire of a winding wound on the coil bobbin main body is arc-welded to the terminal for winding winding. It is characterized by being welded and joined.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a surface mount type coil bobbin and a coil according to the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of the present invention, in which a surface-mounted coil bobbin and a coil are used for a vibrating device for detecting an incoming call of a mobile communication device. FIG. 2 shows a structure in which a lid is added to the structure of FIG. It is a structure. In these figures, 11 is a coil bobbin main body made of an insulating resin, 12 is a winding wound around the outer periphery of the coil bobbin main body, 12a is its terminal wire, 1a
Reference numeral 3 denotes a surface mounting terminal, and reference numeral 14 denotes a winding tying terminal electrically connected to the surface mounting terminal (usually integrally formed of a thin metal plate). Here, a concave portion 15 is formed at the center of the long side of the mounting-side bottom surface of the coil bobbin main body 11, and the winding entanglement terminal 14 is implanted so as to protrude downward from a substantially central position of the concave portion 15. And is arranged within the projected area of the coil bobbin main body 11. Each winding binding terminal 14 is preferably a straight plate or rod so as not to protrude from the projected area. The surface mounting terminals 13 have a flat plate shape and are fixed to the four corners of the bottom surface of the coil bobbin main body 11 on the mounting side so that the amount of protrusion from the projection area is a necessary minimum.

A terminal wire 12a of the winding 12 wound around the outer periphery of the coil bobbin main body 11 is entangled with a winding entanglement terminal 14 protruding downward from a substantially central portion of the concave portion 15, and the entangled portion is formed. Are welded to the winding binding terminal 14 by arc welding. A metal material suitable for arc welding is used for the winding entanglement terminal 14 and the winding wire. At this time, the entire length is shortened by melting the tip of the winding entanglement terminal 14 by arc welding. . Each of the winding binding terminals 14 does not protrude below the surface mounting terminal 13 in a state after arc welding. This is because the winding entanglement terminal 14 does not hinder surface mounting on the board surface.

Numerals 20 denote projections formed at the four corners of the upper end surface of the coil bobbin main body 11 for mounting the lid 30 shown in FIG. 2, and 40 denotes a leaf spring mounting formed on the upper and lower end surfaces of the coil bobbin main body 11. It is a convex part. These are structures added to configure a vibration driving device for incoming call detection of a mobile communication device. Although not shown, in order to configure the incoming-call detecting vibration driving device, a vibrating body having a permanent magnet is housed inside the surface mount type coil of FIG. 1 and a leaf spring is mounted on the upper and lower end surfaces of the coil bobbin main body 11. A leaf spring is attached with the convex portion 40 for use.

According to this embodiment, the following effects can be obtained.

(1) The coil binding terminal 14 and the surface mounting terminal 13 are separately provided on the coil bobbin body 11, and the winding binding terminal 14 and the surface mounting terminal 13 are electrically connected. At least the winding binding terminals 14 are arranged within the projected area of the coil bobbin main body 11, so that the surface mounting area of the surface mounting type coil with respect to the circuit board to be mounted is smaller than that of the conventional product. be able to. Also, the amount of protrusion of the surface mounting terminals 13 from the projected area is small, and each terminal can be arranged within a substantially projected area of the coil bobbin main body 11 when designing a circuit board.

(2) Since the winding binding terminal 14 is provided in the concave portion 15 formed on the mounting side bottom surface of the coil bobbin main body 11 and does not project below the surface mounting terminal 13, The binding terminal 14 does not hinder the mounting of the surface mount type coil on the circuit board to be mounted. In other words, the terminals 14 for winding winding do not contact the surface mounting portion surface of the circuit board during surface mounting. In addition, since the winding entanglement terminal 14 is disposed substantially at the center of the concave portion 15, the arc welding operation is also facilitated.

(3) Since the terminal wire 12a of the winding 12 wound around the coil bobbin main body 11 is welded and joined to the winding tying terminal 14 by arc welding, it is possible to eliminate inconvenience caused by soldering. For example, problems such as dissolution of coil bobbin resin and environmental pollution due to lead contained in solder can be solved.

Incidentally, a heat-resistant insulating tape may be provided so as to cover the winding wound around the outer periphery of the coil bobbin main body.

Although the embodiments of the present invention have been described above, it is obvious to those skilled in the art that the present invention is not limited to the embodiments and various modifications and changes can be made within the scope of the claims. There will be. For example, in the embodiments, the surface mount type coil bobbin and the coil used for the incoming call detection vibration device of the mobile communication device have been described as an example, but the present invention is applicable to various surface mount coil bobbins.

[0021]

As described above, according to the present invention,
Since at least the winding tying terminals are arranged within the projected area of the coil bobbin main body, the surface mounting area of the surface mount type coil bobbin with respect to the mounting board can be minimized, and the winding tying is possible. As a structure in which the terminal wire can be joined to the terminal by arc welding, it is possible to eliminate the inconvenience associated with the soldering of the terminal wire.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of a surface mount type coil bobbin and a coil according to the present invention.

FIG. 2 is a perspective view showing a structure in which a lid is attached to the configuration of FIG. 1;

FIG. 3 is a perspective view of a conventional example of a surface mount type coil bobbin and a coil.

[Explanation of symbols]

 1, 11 Coil bobbin main body 2, 12 Winding 2a, 12a Terminal wire 3, 13 Surface mounting terminal 4, 14 Winding terminal 15 Depression 20 Projection 30 Lid 40 Leaf spring mounting projection

Claims (3)

[Claims] A coil bobbin main body, a winding tying terminal and a surface mounting terminal are separately provided, and the winding tying terminal and the surface mounting terminal are electrically connected to each other; A surface-mounted coil bobbin, wherein the winding binding terminal is disposed within a projected area of the coil bobbin main body. 2. The winding binding terminal is provided in a concave portion formed on a mounting-side bottom surface of the coil bobbin main body,
The coil bobbin according to claim 1, wherein the coil bobbin does not protrude below the surface mounting terminal. 3. The coil bobbin main body is provided with a winding entanglement terminal and a surface mounting terminal separately, and the winding entanglement terminal and the surface mounting terminal are electrically connected to each other. The winding binding terminal is disposed within the projected area of the coil bobbin main body, and a terminal wire of a winding wound around the coil bobbin main body is welded to the winding binding terminal by arc welding. A surface mount type coil characterized by the following.