JPH05258957A - Surface-mount type inductor - Google Patents

Abstract

PURPOSE:To obtain a cheap surface-mount type inductor which is applicable to electronic equipments, communication equipments or the like and enhanced in reliability and safety. CONSTITUTION:When a lead wire starting end 4 is connected to an inner terminal 2 or an outer terminal 6 provided onto a lead frame, the end 4 is inserted into the terminal 2 and joined together by pressure bonding, so that ends 4 and 9 and terminals can be connected together without soldering, consequently an inductor of this design can be protected against deterioration caused by soldering heat and solder itself and enhanced in reliability and safety.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount inductor used in electronic equipment, communication equipment and the like.

[0002]

2. Description of the Related Art In recent years, due to the rapid progress of semiconductor technology, various electronic devices and communication devices have been digitized and become higher in frequency, and have improved functions and higher performance. A mounting type with high reliability is desired.

A conventional surface mount inductor will be described below. FIG. 10 is a transparent perspective view showing an internal configuration of an example of a conventional surface mount inductor. In FIG. 10, a winding 16 is formed on a drum type magnetic core 15 made of a magnetic material such as ferrite, and internal electrode terminals 17 are provided for the drum type magnetic core 15.
The end portion of the winding wire 16 is wound around the wiring and wired, and thereafter, this is joined by the solder 18 and the whole is externally molded.

In another example, a coil bobbin 19 made of a resin molding as shown in FIG. 11 is provided with a winding wire 20, and an end portion of the winding wire 20 is wound around a terminal 21 for wiring.
After that, this is joined by soldering, and the coil bobbin 1
9, the magnetic core 22, the case 23, and the core band 24 are incorporated.

[0005]

In the above structure, since the ends of the windings 16 and 20 are joined to the terminals by soldering after wiring, product deterioration due to heat at the time of soldering or solder itself may occur, or A separate space for the solder pool had to be secured, which was not suitable for miniaturization of parts.

An object of the present invention is to provide a surface mount inductor which has improved reliability and safety by a joining means which does not rely on soldering, at a low cost, as a measure against the above problems.

[0007]

In order to solve the above-mentioned problems, the present invention has a structure in which a winding end is press-bonded to an internal terminal or an external terminal on a lead frame by sandwiching the terminal and the terminal and pressing them. To do.

Further, the winding end portion is folded or not folded, and a force is applied to the winding end portion to collapse the winding end portion and the winding end portion itself is used as a terminal.

[0009]

According to the above structure, since the winding ends and the terminals are not joined by soldering, it is necessary to secure the space for the solder pool, which may lead to product deterioration due to heat at the time of soldering or the solder itself. In addition, the reliability and safety can be improved, the size can be reduced, and members such as solder can be omitted, so that the cost can be reduced.

[0010]

【Example】

(Embodiment 1) An embodiment of the present invention will be described below with reference to the drawings. 1 is a transparent perspective view showing an embodiment of a surface mount inductor according to the present invention, and FIGS. 2 and 3 are perspective views showing an embodiment of a surface mount inductor according to the present invention when wiring. FIG. 4 is a perspective view showing another embodiment of the surface mount inductor according to the present invention when wiring, and FIG. 5 shows an embodiment of the surface mount inductor according to the present invention at the time of joining terminals of winding ends. It is a perspective view.

As shown in FIG. 2 or 3, wiring is performed by arranging or winding a conductor wire 8 around an internal terminal 2 on a lead frame 7 to which a drum type magnetic core 1 made of a ferrite molded body or the like is attached. However, at this time, the coating film of the conductor wire 8 which is arranged or wound on the internal terminal 2 is excluded. Also, the wiring is as shown in FIG.
You may go up.

The starting end portion 4 of the conductor 8 wired as described above.
And the internal terminal 2 clamped by sandwiching the jig 10 as shown in FIG. 5, is joined pressed against the start end 4 and the internal terminal 2 conductors 8 hold down these with a force of 9.8-60 × 10 ⁶ Pa. After that, the sandwiching jig 10 is removed, the conductor wire 8 is wound around the drum-shaped magnetic core 1, and after the desired winding wire 3 is finished, the terminal end portion 9 of the winding wire 3 is similarly pressed and joined. Further, it is sealed with an outer package 5 made of synthetic resin, the lead frame 7 is cut, and the terminals are formed to form a surface mount inductor having external terminals 6 as shown in FIG.

By constructing the surface mount inductor as described above, the winding ends 4 and 9 and the internal terminal 2 can be connected without soldering, so that product deterioration due to heat at the time of soldering or the solder itself may occur. Will be eliminated, and reliability and safety will be improved. In addition, since members such as solder can be omitted, the cost can be reduced.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings. FIG. 6 is a perspective view showing an embodiment of a surface mount inductor according to the second embodiment of the present invention, and FIG. 7 is an embodiment of wiring the surface mount inductor according to the second embodiment of the present invention. FIG. 8 is a perspective view showing another embodiment when wiring the surface mount inductor according to the second embodiment of the present invention, and FIG. 9 is a second embodiment of the present invention. FIG. 6 is a perspective view showing an embodiment when the winding end portion of the surface-mount inductor according to FIG.

As shown in FIG. 7, the starting end portion 4 of the conductive wire 8 is arranged on the collar portion 11a of the coil bobbin 11 made of a resin molding or the like. However, at this time, the conductor wire 8 of the portion to be crushed in the subsequent process
The film of 1 is excluded.

The starting end portion 4 of the conducting wire 8 arranged as described above.
9 with the sandwiching jig 10 as shown in FIG.
These are pressed down by a force of 60 × 10 ⁶ Pa to crush the starting end portion 4 of the conductive wire 8 to form the external terminal 6. After that, the sandwiching jig 10 is removed, the conductor wire 8 is wound around the coil bobbin 11, and after the desired winding 3 is completed, the winding terminal portion 9 thereof is formed.
Is similarly arranged on the other flange 11b of the coil bobbin 11 and crushed to form another external terminal 6. When the diameter of the conductor wire used at this time is small and it cannot be formed into the desired size of the external terminal 6 when it is crushed, as shown in FIG.
Should be folded back.

Further, the case 12, the split magnetic core 13 and the core band 14 are fitted together to form a surface mount inductor as shown in FIG.

By constructing the surface mount inductor by the above work, not only soldering-less but also the external terminal 6 can be constructed without separately providing it, so that not only the reliability and safety are improved. Since it is not necessary to consider the space for the solder pool and the bonding space, the size can be reduced. Further, it is possible to reduce costs by omitting members such as external terminals and solder.

[0019]

As described above in detail, since the surface mount inductor according to the present invention can join the winding end and the terminal without soldering, the product deterioration due to the heat at the time of soldering or the solder itself can be avoided. Is eliminated and reliability and safety are improved. Further, since members such as solder can be omitted and the number of steps can be reduced, cost reduction can be achieved.

Further, since the winding itself is used as a terminal, the terminal can be constructed without providing a separate terminal, and it is not necessary to consider a space for a solder pool or a joining space. Planned. Further, since the external terminals and the members such as solder are omitted, the cost can be greatly reduced, and the industrial effect becomes extremely large in combination with the high reliability and safety of the product.

[Brief description of drawings]

FIG. 1 is a transparent perspective view showing an embodiment of a surface mount inductor according to the present invention.

FIG. 2 is a perspective view showing an embodiment when wiring the surface mount inductor according to the present invention.

FIG. 3 is a perspective view showing an embodiment when wiring the surface mount inductor according to the present invention.

FIG. 4 is a perspective view showing another embodiment when wiring the surface mount inductor according to the present invention.

FIG. 5 is a perspective view showing an embodiment at the time of terminal joining of the winding end portion of the surface mount inductor according to the present invention.

FIG. 6 is a perspective view showing an embodiment of a surface mount inductor according to a second embodiment of the present invention.

FIG. 7 is a perspective view showing an embodiment when wiring a surface mount inductor according to a second embodiment of the present invention.

FIG. 8 is a perspective view showing another embodiment when wiring the surface mount inductor according to the second embodiment of the present invention.

FIG. 9 is a perspective view showing an embodiment when the winding end portion of the surface mount inductor according to the second embodiment of the present invention is crushed.

FIG. 10 is a perspective view for explaining a conventional example.

FIG. 11 is a perspective view for explaining another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum type magnetic core 2 Internal terminal 3 Winding 4 Lead wire start end 5 Exterior body 6 External terminal 7 Lead frame 8 Lead wire 9 Winding end portion 10 Clamping jig 11 Coil bobbin 12 Case 13 Split magnetic core 14 Core band

Claims (2)

[Claims] 1. A surface in which a winding end of a winding wound around a drum type magnetic core or a coil bobbin incorporating the magnetic core is pressed and connected to an internal terminal or an external terminal with a force of 9.8 to 60 × 10 ⁶ Pa. Mounted inductor. 2. The end portion of a winding wound around a drum type magnetic core or a coil bobbin incorporating the magnetic core is folded or not folded and pressed by a force of 9.8 to 60 × 10 ⁶ Pa to crush it. A surface mount inductor having formed terminals.