JPS62154712A - Manufacture of small-sized inductor - Google Patents

Abstract

PURPOSE:To cut down the manhours of working by a method wherein a pair of protruded pieces are provided on the opposing side walls of the base part of an inductor main body, a lead terminal is formed into a lead terminal frame provided with opposing lead terminal pieces, engaging holes are provided on the pinching plate part located at the tip of the lead terminal frame, and the main body of the small-sized inductor is easily supported. CONSTITUTION:A pair of protruded pieces 22 are integrally provided on the opposing side walls of the base part 21 consisting of electrically insulative magnetic material of an inductor main body 1. Also, a lead terminal is formed on the lead terminal frame 4 provided with the lead terminal pieces 5, which are opposing each other, having the H-shaped punched holes provided on a strip-formed metal plate leaving the uniform space L0 between them. Besides, on the lead terminal pieces 5, pinching plate parts 52 are formed in such a manner that their tip is bent and the lines l1 and l2 are positioned facing each other in parallel with the width direction of the lead terminal pieces 5, and an engaging holes 51 are provided on the pinching plate parts 52. Then, the above-mentioned inductor main body 1 is pressed in between the above-mentioned inductor main body 1, the protruded pieces 22 are inserted into the holes 51, the inductor main body 1 is fixed to the lead terminal frame 4 in a pinched manner, and an outer covering is provided by means of using insulative resin molding.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a method of manufacturing a small inductor with lead terminals that is packaged with an insulating resin mold.

[Conventional technology]

To explain this type of conventional small inductor using a drum-shaped ferrite core as an example, the inductor body is made by winding the winding wire in the annular groove of the drum-shaped core to form a coil, and the ends of the coil and Trap directly with one end of the strip-shaped lead terminal.

Alternatively, connect the other ends of the lead terminals by pulling them away from each other through the relay electrodes provided on opposite sides of the core, and then expose the other ends of the lead terminals and cover the inductor body with an insulating resin mold. It was made by

[Problem that the invention seeks to solve]

In the manufacturing method described above, when the dimensions of the inductor body are small, it is difficult to hold the inductor body, and it is also difficult to pull out the lead terminals in a desired direction and connect them.

In addition, the connection strength of the lead terminals is low, and the inductor body must be held and handled even when molded with an insulating resin, making it difficult to insert the inductor into a mold.

[Means for solving problems]

In the present invention, the inductor body is integrally provided with a pair of projecting pieces on opposing side walls of a base made of an electrically insulating magnetic material, and the lead terminals are formed in a lead terminal frame having lead terminal pieces facing each other, The above-mentioned problem is solved by forming clamping plate portions facing each other at the tips of the lead terminal pieces and providing locking holes in the clamping plate portions.

[Effect]

The inductor body is clamped at a fixed position on the lead terminal frame by inserting the protrusion between the clamp plates with the protrusion facing the clamp plate and inserting the protrusion into the locking hole, so that the inductor body can be handled as a whole with the lead terminal frame. .

〔Example〕 FIG. 1 is a diagram for explaining one embodiment of the present invention.

In the figure, an inductor 1 has a drum-shaped ferrite core 2 with rectangular flanges 21 provided at both ends thereof, and a winding 3 (indicated by a chain line) wound around the outer periphery (annular groove) of a cylindrical portion in the middle. A pair of protrusions (only one of which is shown) 22 are integrally provided on opposing sides of the lower collar 21 of the core 2 . 4 is a lead terminal frame made of wood, brass, beryllium copper, or other highly elastic band-shaped metal plate with good electrical conductivity.

H-shaped holes are formed at regular intervals (Lo in the figure) along its length by pressing or etching. Although the figure shows a portion with three punched holes, it may be formed as a lead terminal frame with one punched hole.

As shown in the first (front) punching hole, the H-shaped punching hole forms the frame portions 6 on both sides of the two opposing lead terminal pieces 59 and the boundary portion 7 with the adjacent punching hole. ing. The lead terminal piece 5 is provided with a locking hole 51 near its tip, through which the protruding piece 22 of the core 2 can be inserted. Further, the lead terminal piece 5 is folded at approximately right angles along the bending line t1 extending in the width direction and at a valley fold along the bending line t2. In this way, the lead terminal piece 5 is formed into a lead terminal piece 5 having a clamping plate part 52 and an L-shaped intermediate plate part 53 facing each other as shown in the second punched hole part. The interval dimension W between the clamping plate parts 52 is the dimension W between the opposing side walls on which the protruding pieces 22 of the core 2 are provided. The dimensions are set to be approximately equal to or slightly smaller than.

After forming the locking holes 51 and the clamping plate parts 52 on all the lead terminal pieces 5 of the lead terminal frame 4, the clamping plate parts 5
Insert the inductor main body 1 between the inductor bodies 1 and 2, respectively, with the protrusion 22 facing the locking hole 51 as shown by the arrow in FIG.

At this time, the opposing clamping plate parts 52 are slightly expanded in the direction away from each other.

The inductor main body 1 may be inserted in this state, and the expansion may be stopped when the protruding piece 22 is inserted into the locking hole 51, or the holding plate portion 52 may be inserted without being expanded. In either case, the clamping plate portion 52 and the intermediate plate portion 53
Due to the springiness of the core 2, a pressing force acts in the radial direction of the core 2 to hold the inductor body 1. This state is shown in the third punch hole.

Further, the end portion of the first winding 3 (indicated by a chain line) is electrically connected to the clamping plate portion 52 . If the lead terminal frame 4 is fixed, neither the inductor body 1 nor the lead terminal piece 5 will move.
This connection work is easy.

Thereafter, the frame portion 6 and the required length of the base of the lead terminal piece 5 are exposed and covered with an insulating resin mold, and finally separated from the frame portion 6 to complete a small inductor with lead terminals.

FIG. 2 shows a front sectional view of another embodiment of an inductor according to the invention. In this example, the inductor body 1 has a pot-shaped ferrite core 8. Plate-shaped ferrite core9. and a planar coil 10. The pot-shaped core 8 has a coil end extraction groove 81 formed diagonally on the end surface of its outer peripheral wall, and a projecting piece 82 is integrally formed at the lower part of the outer peripheral wall corresponding to the groove 81.
In this course, a relay electrode section 83 is provided between the two electrodes. Further, the lead terminal piece 5 has a structure in which only the locking hole 51 and the clamping plate portion 52 are molded. The embodiment of FIG. 2 can also be made in the same manner as described with respect to FIG. In this embodiment, the holding plate part 52 of the lead terminal piece 5 can be firmly and electrically connected over a wide area to the middle vertical terminal part 83 formed by vapor deposition or adhesion, so the lead terminal piece 5 can be cut and separated from the frame part 6. It can also be made into a resin mold.

〔Effect of the invention〕

As explained above, according to the present invention, the small inductor main body can be easily held in the lead terminal frame and handled as a whole, reducing the number of man-hours and making it easy to manufacture inexpensive small inductors with lead terminals. can be made to

[Brief explanation of drawings]

FIG. 1 is a perspective view for explaining one embodiment of the manufacturing process according to the present invention, and FIG. 2 is a front sectional view showing another embodiment according to the present invention. DESCRIPTION OF SYMBOLS 1... Inductor main body, 2... Drum-shaped ferrite core, 21... Flange, 22.82... Projection piece, 3...
winding. 4... Lead terminal frame, 5... Lead terminal piece. 51... Locking hole, 52... Clamping plate part, 6... Frame part. 8... Pot-shaped ferrite core, 83... Relay electrode part.

Claims (1)

[Claims] (1) In a method for manufacturing a small inductor in which lead terminals are led out from opposite side walls in a direction away from each other and the inductor body is exteriorized with an insulating resin mold, the inductor body is formed on the opposite side wall of a base made of an electrically insulating magnetic material. a pair of projecting pieces are integrally provided in the lead terminal, and the lead terminal is formed in a lead terminal frame having mutually opposing lead terminal pieces formed by H-shaped punched holes provided at regular intervals in a band-shaped metal plate; Furthermore, the lead terminal pieces are bent at their tips so that the bending line runs along the width direction of the lead terminal pieces to form holding plate portions facing each other, and a locking hole is provided in the holding plate portions, and a locking hole is provided in the holding plate portions. A method for manufacturing a small inductor, comprising: pushing the inductor between the clamping plate parts, inserting the protrusion into the locking hole, clamping and fixing the inductor body to the lead terminal frame, and covering the inductor body with an insulating resin mold.