JPH05168184A - Chip type coil - Google Patents

Abstract

PURPOSE:To improve the coil mounting efficiency to a printed board and the mounting dimension accuracy by uniting a plurality of coils for a flat brushless DC motor. CONSTITUTION:A plurality of nearly triangular flat coils 1 are inserted into the recess of the cavity mold of a molding machine, and resin 10 is filled up in the condition that the lead wires 2a and 2b at both ends of each coil 1 are fixed with a cavity mold and a core mold so as to unite a plurality of coils 1 into a chip type coil 9.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a chip type coil of a flat type brushless DC motor.

[0002]

2. Description of the Related Art FIG. 4 is a front view showing a conventional coil mounted on a printed circuit board, and FIG. 5 is a partially enlarged perspective view of the coil. In the figure, 1 is a coil formed by winding an electric wire having an insulating coating such as an enamel wire on the surface of a core wire made of copper or the like in a substantially triangular shape, and 2a and 2b are lead wires 3a, which are terminals at both ends of the coil 1. 3b is the leader line 2a, 2b
An exposed portion 4 from which the insulating cover is peeled off at the front end of the coil is an inner diameter hole formed in the substantially central portion of the coil 1. Generally, in the case of a flat brushless DC motor, a plurality of coils 1 (six in the figure) are used as shown in FIG. In the figure, 5 is a printed circuit board for mounting the coil 1, and 6a and 6b.
Are pads of conductors provided on the printed circuit board 5 corresponding to the coils 3a and 3b, and 7a and 7b are pads 6
A conductor pattern drawn from a and 6b, and 8 is a virtual rotation center of the rotor of the motor according to the coil 1.

In the above-described structure, as shown in FIG. 4, the six coils 1 are centered on the virtual rotor rotation center 8, and the exposed portions 3a and 3b of each coil 1 are provided on the printed circuit board 5. Further, they were arranged on the printed circuit board 5 so as to face the respective pads 6a and 6b, and the bottom surface of the coil 1 and the surface of the printed circuit board 5 were fixed by an adhesive. In addition, exposed portions 3a and 3 at both ends of each coil 1
b is the opposing pads 6a and 6 on the printed circuit board 5.
It was soldered to b.

[0004]

Since the conventional coil is constructed as described above, the lead wires 2a and 2b are drawn up to the pads 6a and 6b of the printed circuit board 5 and soldering is performed manually. Not only the workability is poor, but also a considerable amount of board space is required for drawing the lead wires 2a and 2b, which is an obstacle to downsizing the motor. Further, since the coils 1 are separately mounted on the printed circuit board 5, it is very difficult to dispose the coils 1 at predetermined positions around the rotor virtual center 8 with high dimensional accuracy.

The present invention has been made in order to solve the above-mentioned problems, and improves the mounting workability and the mounting dimensional accuracy of the coil on the printed circuit board 5, and at the same time, achieves the miniaturization of the motor. A coil is provided.

[0006]

A chip type coil according to the present invention comprises a plurality of coils molded and integrated with a resin.

Further, the plurality of coils are inserted into a concave portion or a convex portion provided in one molding die to be integrally molded.

Further, the fusion conducting wires of each of the plurality of coils are integrally molded in a state in which both end vicinities are fixed by one molding die and the other molding die.

[0009]

The chip-type coil according to the present invention can be integrally mounted on a printed circuit board to form a plurality of coils.

Further, the plurality of coils can be positioned by fitting the plurality of coils into the concave portions or the convex portions provided on one of the molding dies.

Furthermore, both ends of the fusion-bonding wire can be positioned by fixing the portions near both ends of the fusion-bonding wire with one molding die and the other molding die.

[0012]

EXAMPLES Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a front view showing a chip type coil according to an embodiment of the present invention, FIG. 2 is a front view showing a state where the chip type coil is attached to a printed circuit board, and FIG. 3 is a molding machine in which a plurality of coils are integrally formed. It is sectional drawing which shows the processed state.

In FIG. 1, 9 is a chip-type coil of the present invention formed by molding and integrating 6 coils 1 by a molding machine, and 10 is a thermoplastic resin filled in all or part of the 6 coils. The lead wires 2a and 2b of the coil 1 are drawn outside around the resin of the chip coil 9, respectively.

In FIG. 3, 11 is a cavity mold of the molding machine, 12 is a recess formed in the cavity mold 10 so that the six coils 1 can be fitted therein, and 13 is a gate for filling the resin 10. In addition, a part of the cavity mold or the core mold is cut out (not shown), and the lead lines 2a and 2b are fixed so as to be tightly fitted between the cavity mold and the core mold.

In such a configuration, before the chip type coil 9 is attached to the printed circuit board 5, after the chip type coil 9 is integrally formed in FIG. 3, as shown in FIG. Leader line 2 drawn to
A and 2b are cut and peeled to a predetermined length to form exposed portions 3a and 3b.

The chip type coil 9 thus formed is centered on the virtual rotor center of rotation 8 as shown in FIG. 2, and each exposed portion 3a and 3b is provided on the printed circuit board. It is arranged on the printed circuit board so as to face the pads 6a and 6b, and the bottom surface of the chip type coil and the surface of the printed circuit board 5 are fixed by an adhesive.
Further, the exposed portions 3a and 3b are soldered to the opposing pads 6a and 6b on the printed circuit board by means of a riff b- or the like.

[0017]

As described above, according to the present invention, since the plurality of coils are integrally formed by molding with resin or the like, the workability of mounting the coil on the printed circuit board 5 and the mounting dimension accuracy are improved. It is possible to achieve downsizing of the motor.

[Brief description of drawings]

FIG. 1 is a front view showing a chip coil according to an embodiment of the present invention.

FIG. 2 is a front view showing a state in which the chip coil of FIG. 1 is attached to a printed board.

FIG. 3 is a cross-sectional view showing a processing state in which a plurality of coils are molded and integrated by a molding machine according to the embodiment of the present invention.

FIG. 4 is a front view showing a state in which a conventional coil is attached to a printed circuit board.

FIG. 5 is a partially enlarged perspective view of a conventional coil.

[Explanation of symbols]

 1 coil 2a leader line 2b leader line 3a exposed part 3b exposed part 5 printed circuit board 6a pad 6b pad 8 rotor virtual center of rotation 9 chip type coil 10 resin 11 cavity type 12 recess 14 core type

Claims (3)

[Claims] 1. A chip type coil comprising a plurality of coils formed by winding a single self-fusing conductor wire having an adhesive coating on the outside of an insulating coating so as to be in close contact with each other, and winding the plurality of coils. A chip type coil characterized by being integrally molded with resin. 2. The chip-type coil according to claim 1, wherein the plurality of coils are fitted into a concave portion or a convex portion provided on one of the molding dies to be integrally molded. 3. A molding unit in which a portion near both ends of the fusion-bonding wire of each of the plurality of coils is fixed by one molding die and the other molding die, and is integrally molded. The chip type coil according to item 1.