JPH04338614A - Coil device - Google Patents

Abstract

PURPOSE:To provide a coil device suitable for plane loading and suitable for automation of a manufacturing process. CONSTITUTION:This is a coil device wherein a spiral coil is integrally based on an intermediate part of a plate-shaped conductive board, the spiral coil is spirally formed of the standing parts 11A, 11B wherein a plurality of coil pieces are in parallel and alternately standing on the conductive board and a connecting piece 11C connecting the intervals of the tops of the corresponding standing parts between the respective rows, while both end parts of the conductive boards, where the coils are not formed, are made the flat terminal parts for loading external boards.

Description

[Detailed description of the invention]

[Purpose of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to coil devices used in televisions, radios, tape recorders, etc.

0002

[Prior Art] Utility Model Application No. 61-7692 was conventionally used as a coil device used in televisions, radios, tape recorders, etc.
7 has been disclosed.

FIG. 5 is a main drawing attached to the same specification. A coil device 1 shown in the figure has a conductor pattern 3 arranged on the surface of a flexible printed wiring board 2 so as to form an assembled rear wheel, and a plurality of cutout holes through which a magnetic core 4 passes through the printed wiring board 2. The magnetic core 4 is provided so as to pass through every other cutout hole in the same direction.

[0004] Similarly, as a prior art, Japanese Unexamined Patent Application Publication No. 1986-
There is a coil device disclosed in Japanese Patent No. 40209. As shown in FIG. 6, a plurality of cut grooves 6 are formed in a flat strip-shaped conductive plate member 5 at appropriate intervals in the longitudinal direction and are opened alternately on both left and right sides, and then connected as shown in FIG. The coil device 9 is obtained by deforming the narrow plate portions 7 so as to alternately separate them in opposite directions with the portion 8 as the center.

[0005]

[Problems to be Solved by the Invention] In the conventional device,
There is a problem that it is difficult to use it as a coil device for flat mounting.

[0006] If the coil device has the above configuration,
When bending the coil pieces divided by the cut grooves so as to separate them from each other, it is not possible to obtain a rectangular or circular shape by bending only one of the coil pieces, which is inconvenient. Therefore, it is necessary to bend them in opposite directions. As a result, the coil portion bulges up and down (or left and right) with respect to the surfaces of the portions at both ends that will become the terminals, and as it is, flat mounting is impossible and processing such as forming of the terminal portion is required. Therefore, when inserting the magnetic core into the coil in a later process, special measures are required, which complicates the manufacturing process, making it difficult to automate the manufacturing process.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a coil device suitable for flat mounting and suitable for automation of the manufacturing process.

[Configuration of the invention]

[0009]

Means for Solving the Problems In order to achieve the above object, the present invention provides a coil device in which a spiral coil is integrally erected in the middle part of a flat conductive plate. The coil is formed in a spiral shape by a plurality of coil pieces arranged in parallel and alternately standing up on the conductive plate and connecting pieces connecting the tops of the corresponding upright parts between each row. The present invention is characterized in that both ends of the conductive plate, which are not formed, are used as flat terminal portions for mounting an external board.

0010

[Operation] Adjacent coil pieces are erected in parallel on the conductive plate, and the tops of the corresponding standing parts between each row are connected by horizontal coil pieces, so that a spiral coil is formed on the horizontal conductive plate. A standing leg will be formed, and it can be used as is for flat surface mounting.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

FIG. 1 is a perspective view showing a coil device according to the present invention. This is a coil device 10 in which a helical wire coil 11 is integrally formed in the middle part of a flat conductive plate 11h, and the helical wire coil 11 has a plurality of coil pieces 11a to 11f arranged in parallel. Standing part 1 that stands up alternately with
1A, 11B and a connecting piece 11C that connects the tops of the corresponding upright portions between each row, and both ends 11g, 11 of the conductive plate where the coil 11 is not formed.
This is characterized in that g is a flat part for mounting an external board.

By the way, notches 14 are formed at opposite ends of each of the adjacent coil pieces 11a to 11f so that the adjacent coil pieces do not come into contact with each other. A circular notch hole 15 is formed in the portion to prevent cracks caused by bending. This coil device may be used as shown in FIG. 1, or with the spiral coil portion molded with resin. In this case, both ends of the conductive plate 11g, 1
1g is bent so as to be parallel to the wall surface of the mold member 12 (the state of 11g' shown by the chain line in the figure).

[0014] In such a coil device, the conductive plate 11g serving as the terminal is the bottom surface, and the wire-shaped coil 11 is placed above it.
is formed, and the width W of the terminal 11g is the spiral coil 11.
This results in a device in which the widths of the two sides are approximately equal.

FIG. 2 shows another embodiment of the invention. The coil device 20 shown in FIG. 2 is different from the device shown in FIG. This is the point where it is formed.

Even with such a device, the same effect as that of the device shown in FIG.
Since the magnetic core 13 is formed in an upright manner, the magnetic core 13 can be easily and securely inserted and arranged, and has an optimal structure as a flat-mounted coil device.

Next, the manufacturing process of the coil device having the above configuration will be explained with reference to FIGS. 3 and 4.

First, the lead frame 11i, which is a conductive plate,
The central part of the plate is pressed and molded into the shape shown in FIG. 3 (the hatched part is the cutout part). During this press working, cut lines are formed alternately from one side end to the vicinity of the other side end of the portion that will later become the spiral coil, and
A through hole 15' is formed at the end of each score line, and a notch 14 is formed between adjacent ends of each coil piece.

The details of the press working will be explained below.

Connecting piece 11h, 1 serving as a lead piece (terminal)
1h are arranged at the top and bottom in the figure, and two rectangular holes H1 are formed on the left and right so that the coil part 17 is connected to the middle part of these connecting pieces.
, H2. The width of this hole is H1 on one side (right side)
The other (left side) H2 is provided so that it is wider than the other (left side) H2. The coil portion 17 is biased so that the spacing on one side (on the right side) is narrow and the spacing on the other side (on the left side) is about twice as large with respect to the center line L of the connecting piece 11h. Cut lines 17a, 1 are cut into the coil portion 17 from opposite directions alternately at predetermined intervals in a direction intersecting the center line.
7b,... are formed. The spaces between each of these cut lines become coil pieces 11a, 11b, . . . . Such coil pieces are connected at each end to function as a series of coils. Lines l1 and l3 along each row of through holes 15' formed at both ends of each score line and a center line l2 of these lines serve as lines for bending the coil pieces in the next step. The width between each line is the same width W1
It becomes.

Next, the process of forming the linear coil 11 will be explained with reference to FIG.

[0022] This is done by lifting and bending the adjacent coil pieces upward so as to alternately stand them up, using each of the bending parts l1 to l3 in FIG. 3 as a mark. In this way, as shown in FIG.
A and the standing portions 11B lined up on the other line l2 are formed in parallel, and the corresponding standing portions 11A, 11B between each row
The tops of 11B are connected to each other by a horizontal connecting portion 11C. That is, a spiral coil is formed by forming the standing portions in a parallel standing state. In this way, the linear coil 11 is formed on the conductive plate. At this time, the through holes 15' formed at the ends of the coil pieces make it easy to bend and stand up, and the notches 14 between the coil pieces serve to prevent contact between adjacent coil pieces that are stood up. has. This through hole 15' becomes a circular notch hole 15 after bending.

After that, both ends 11g of the conductive plate are connected to lines 21.
The coil device is completed by cutting the lead frame 11h at the portion.

The spiral coil may be resin-molded before being cut from the lead frame 11h, or may be resin-molded after the magnetic core is inserted into the spiral coil.

According to the above embodiment, processing of the lead frame, raising and bending the coil pieces, inserting and arranging the magnetic core, resin molding, cutting from the lead frame, bending the terminal portion, etc. are all performed using a jig. Since it can be carried out as a series of steps, it is extremely effective for automation and mass production. Furthermore, since a structure with a flat bottom can be obtained, the magnetic core can be easily inserted, and the finished product can be easily and accurately mounted on an external board.

It should be noted that the present invention is not limited to the one embodiment described above, but can be modified in various ways within the scope of the gist.

For example, in the embodiment described above, a solid magnetic core (ferrite core) is inserted into the spiral coil, but it is also conceivable that the magnetic core is made of resin containing ferrite powder.

[0028]

[Effects of the Invention] According to the present invention described in detail above, it is possible to obtain a coil device that can be mounted on a flat surface, and also enables automation and
We can provide coil devices suitable for mass production.

[Brief explanation of drawings]

[Fig. 1] A perspective view showing an example of the coil device of the present invention.

[Figure 2]
A perspective view showing an example of the coil device of the present invention

[Fig. 3] A manufacturing process plan view for explaining the manufacturing method of the device of the present invention.

[Fig. 4] A perspective view of the manufacturing process for explaining the manufacturing method of the device of the present invention.

[Fig. 5] Explanatory diagram showing a conventional coil device

[Fig. 6] Explanatory diagram showing a conventional coil device

[Fig. 7] Explanatory diagram showing a conventional coil device

[Explanation of symbols]

10 Coil device 11 wire coil 11a to 11f Coil pieces 11g terminal 11A, 11B Standing part 11C Horizontal connection part 14 Notch

Claims (2)

[Claims] 1. A coil device in which a spiral coil is integrally erected in the middle part of a flat conductive plate, wherein the spiral coil has a plurality of coil pieces arranged in parallel and alternately connected to the conductive plate. The conductive plate is formed in a helical shape by an upstanding part that stands up upwards and a connecting piece that connects the tops of the corresponding upright parts between each row, and both ends of the conductive plate where the coil is not formed are placed on a flat surface for mounting an external board. A coil device characterized by having a carrier terminal portion. 2. The coil device according to claim 1, wherein a magnetic core is inserted into the spiral coil.