JP3452963B2 - Thin transformer, method of manufacturing the thin transformer, and method of using the thin transformer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thin fixed inductor, a thin transformer used for driving a backlight of a liquid crystal display device of an ultra-small portable device, and a method of manufacturing and using the thin transformer.

[0002]

2. Description of the Related Art Conventionally, there is a fixed inductor in which a coil wound around a drum-shaped core is connected to a terminal pin embedded in the lower surface of the drum-shaped core.

Further, as a backlight driving transformer of a liquid crystal display device, as disclosed in FIG. 1 of Japanese Patent Laid-Open No. 5-283248, a base portion having a plurality of terminals planted on two opposite side surfaces, Some include a cylindrical bobbin projecting upward from the base portion and a pair of magnetic cores forming a closed magnetic path that are vertically abutted via the bobbin.

[0004]

However, in any of the above-mentioned conventional structures, there is a problem in that the coil cannot be made thin because there is a bobbin around which a coil is wound above a base portion in which terminal pins are implanted. With the recent trend toward card-type radio calling devices, it is required to make the transformer mounted as thin as possible. However, when the transformer having a thickness of 2 mm or less is used, this bobbin portion becomes a problem. Also, the base itself is thin,
The smaller the size, the more serious the strength problems such as the terminal implantation strength and breakage during handling. In addition, recent mobile devices are preferred to be small and thin, but those that occupy a large area even if they are thin, such as integrated circuit parts, or conversely, those that occupy spatially, such as electrolytic capacitors and high-frequency transformers. It is difficult to obtain a good integration rate because the space occupied by electronic components varies.

The present invention has solved the above-mentioned problems, that is, the transformer which can secure the strength while being extremely thin, the manufacturing method thereof, and the upper side of the thin electronic component which has conventionally been a dead space. It is intended to provide a usage method to be used.

[0006]

The basic problems of the present invention
Has a plurality of terminals (2) on its side surface.
The diaphysis that is integrated and is made of a reinforcing metal member
(8) is integrated into a frame shape, and the core receiving part is provided on the inner lower part.
Square base (1) provided with (3) and the core receiver
Part of the base so that it is thinner than the thickness of the side surface of the base.
The plate-shaped cores (4, 44) placed on the
Within the thickness of the prismatic base, either directly or through the bobbin (9)
A groove that is wound around and the end is arranged on the upper surface of the rectangular base.
A coil connected to the terminal through (1a)
(5), wherein the terminal and the diaphysis are formed of the same metal member.
This can be achieved with a thin transformer made. Specifically, claim 2
, The core is composed of a single core of type I (4).
This can be achieved with a thin transformer that is made. Further, claim 3
, The core comprises at least two cores (4
4), and the magnetic path is projected through the saturation prevention member (44a).
It can be achieved with a combination of things. In addition, it is shown in claim 4.
As described above, the prismatic base (1) is a relatively flexible liquid crystal.
Molded with resin, the inside of the core receiving part (3) is a through hole (1
0), and a part of the coil (5a, 5
This can be achieved by storing b, 9).

Such a thin transformer is shown in claim 5.
Sea urchin, the terminal (2) and the diaphysis (8) on a metal plate
Plural units are connected at the required pitch via the connecting parts.
And press forming, and then the required pitch P
Including the terminals and diaphysis with multiple molds
And mold it integrally to have the core receiving part (3)
The step of forming the base (1) by
A step of partial cross from the connecting portion of the diaphysis, the to the base
The core (4, 4) equipped with the coils (5, 5a, 5b)
4) is placed and the step of wiring this terminal to the terminal is included.
It can be achieved by the manufacturing method.

A preferred method of using the present invention is to use a contract
As shown in claim 7, a thin transformer according to claims 1 to 4.
Is attached to the flexible board (12) and the terminals are connected.
After the line, a flexible substrate having the thin transformer,
Thin electronic components arranged on the main board (14) on the device side
Attached to the upper surface of (15) via double-sided adhesive tape (13)
Then, connect the terminal part of the flexible board to the main board.
Can be achieved by

According to the first aspect of the invention, the core receiving portion is provided inside the base, and the plate-shaped core thinner than the thickness of the base is laid on the receiving portion, and the core is placed on the receiving portion. Or thinner and the strength can be maintained by placing the diaphyseal consisting reinforcing metal member of the frame-type prismatic base
And, since the diaphysis and the terminal can be the same member, either the cost is not required. That is, the cost of the diaphysis is included in the terminal cost, and the cost can be reduced. Claim
In the means shown in FIG. 2 , a fixed inductor having a simple structure can be obtained by forming the core with a single core having an I-shaped plane. According to the means described in claim 3 , a high inductance with less saturation can be obtained, which is suitable as an inverter transformer. In the means described in claim 4 , the capacity of the coil can be increased by the through hole.

In the means according to the fifth aspect, the base in which the terminal and the diaphysis are integrally incorporated can be easily automated and mass-produced.

In the means according to the sixth aspect , since such a transformer can be mounted on the thin electronic component of the device, it can be mounted without considering the position space of the plane, and the dead space on the device side. , The efficiency of integration is improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a cross section of a main part adopted in a thin fixed inductor according to a first embodiment of the present invention. ) Etc., a base made of a relatively flexible resin having heat resistance is provided with a plurality of terminals 2 planted laterally and a core receiving portion 3 provided inward.
An I-shaped core 4 having a flat surface thinner than the thickness of the base 1 is mounted on the core receiving portion 3 together with a coil 5 wound around a bobbin 9, and is covered with a lid 6 and fixed by a locking portion 7. ing. If the lid 6 is unnecessary, the corner of the core 4 may be locked by the receiving portion 3 of the core. In the figure, 1a is a groove for passing a coil end arranged on the base 1, 8 is a diaphysis made of a reinforcing metal member,
As will be described later, it is embedded in the base in a frame shape. Although the coil 5 is wound around the bobbin 9 in the above description, it may be wound directly around the core 4.

FIG. 2 shows a cross section of a main part adopted in a thin inverter transformer as a second embodiment of the present invention, in which a core 44 is made of high magnetic permeability material such as EE type, CI type or CC type magnetic path butted together. In this case, in order to prevent saturation, a polyester film 44a or the like is inserted to form two cores. The bobbin 9 is inserted in the core 44, and the coil as described above is wound around it. 5 in the figure
Reference numeral a denotes a low-voltage side coil 5b, and high-voltage side coil 9a and 9b are grooves through which coil ends are inserted to connect to terminals 2. In this embodiment, the lid 6 is not used, and the core receiving portion 3
There are 10 through holes in the inside of the so that the brim 9c of the bobbin 9 can be inserted. Since other configurations are almost the same as those in FIG. 1, the same reference numerals are given and description thereof will be omitted.

FIG. 3 is a perspective view showing a method of manufacturing these transformers. The skeleton 8 consisting of a plurality of terminals 2 and a reinforcing metal member is made of the same material, and a phosphor bronze plate is plated with a solderability metal. It is press-molded so that it is insulated from each other at a required pitch and connected (for example, 10 connections), and is inserted into a mold formed at the same pitch to mold the base, integrally molded, and connected. The base 1 described above is molded in this state. After molding, the terminal 2 and the diaphysis 8 are separated from the connecting member 11 and separated, and the single base 1 is completed. After that, as described above, the coils 5, 5a, 5b are wound, the cores 4, 44 with the bobbins 9 are fitted into the coil receiving portions 3, and the coil ends are connected to the terminals through the grooves 1a. is there.

FIG. 4 shows a side view of a usage example in which the thin transformer T is mounted on a portable device such as a radio calling device. The thin transformer T is placed on the flexible substrate 12 and soldered. , The double-sided adhesive tape 13 is attached to the upper surface of the thin electronic component 15 such as an integrated circuit arranged on the main substrate 14, and the terminal portion of the flexible substrate is the main substrate 14.
It is designed to be connected to. As the thin electronic component, a flat vibration motor, a back surface of a liquid crystal display device, or the like can be adopted in addition to the integrated circuit component.

[0016]

Effects of the Invention The present invention, very thin transformer since to disposed sideway thin cores than the base thickness on the inner side of the base as described above can be obtained, from the reinforcing metal member in base over scan Since the diaphysis is arranged, the strength is improved, and it is possible to make it thinner. Since the terminal and diaphysis are the same member and are integrated into the base at the same time, the cost can be reduced. A simple thin fixed inductor can be provided when the above core is composed of a single core whose plane is I-shaped.
When the core is composed of two pieces abutted against each other via the saturation prevention member, a high inductance with less saturation is obtained, and the core can be provided as a thin inverter transformer. In the case where the base has through holes, the capacity of the coil can be increased by the through holes. Manufacture in which the terminal and the diaphysis are integrally connected and pressed to a plate material at a required pitch, and then the base is completed by connecting and molding according to the pitch to separate the wrought iron portion, and then the core and the coil are attached. Depending on the method, automation and mass production are possible. By mounting such a thin transformer on the mobile device by the above-described usage, the space of the mobile device can be effectively utilized. That is, since the dead space is used, it can contribute to the integration of mobile devices.

[Brief description of drawings]

FIG. 1 is a sectional view of a main part of a first embodiment of a thin transformer used as a fixed inductor of the present invention.

FIG. 2 is a sectional view of an essential part of a second embodiment used as an inverter transformer of the present invention.

FIG. 3 is a perspective view illustrating a method for manufacturing a thin transformer according to the present invention.

FIG. 4 is a sectional view of an essential part of a method of using the thin transformer of the present invention.

[Explanation of symbols]

1 base 2 terminals 3 core receiving part 4,44 core 5 coils 6 lid 7 Locking part 8 diaphysis 9 bobbins 10 through holes T Thin transformer 12 Flexible substrate 13 Double-sided adhesive tape 14 Main board 15 Thin electronic components

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Claims (6)

(57) [Claims] 1. A plurality of terminals (2) are integrated on a side surface, a diaphysis (8) made of a reinforcing metal member is integrated in a frame shape, and a core receiving portion (3) is formed in a lower part on the inside. The provided rectangular base (1), the plate-shaped core (4, 44) laid on the core receiving portion so as to be thinner than the thickness of the side surface of the base, and directly or on the core. (9) wound in said rectangular base having a thickness through, terminal and a coil (5) which is connected to the terminal through the groove (1a) which arranged on the upper surface of said rectangular base, said
A thin transformer with terminals and diaphysis made of the same metal material . 2. The core comprises a single core of type I (4).
The thin transformer according to claim 1, which is formed. 3. The core comprises at least two cores (4
4), and the magnetic path is projected through the saturation prevention member (44a).
The thin transformer according to claim 1, wherein the thin transformers are assembled together. 4. The prismatic base (1) is relatively flexible.
Molded with liquid crystal resin, the inside of the core receiving part (3) is a through hole
(10), and a part of the coil (5
The thin transformer according to claim 1, wherein a, 5b, 9) are stored.
Organizer. 5. A terminal (2) and a diaphysis (8) are provided on a metal plate material.
Plural units are connected at the required pitch via the connecting parts.
The press forming process and then adjust to the required pitch.
The cores, including terminals and diaphysis, are
By integrally molding so as to have a hook (3),
Forming the base (1) and connecting the terminals to the diaphysis
The process of separating from the part and the coil (5, 5
Place the core (4, 44) with a, 5b)
How to manufacture a thin transformer with the step of wiring terminals to terminals
Law. 6. A thin transformer according to any one of claims 1 to 4
After mounting on the kisible board (12) and connecting the terminals,
The flexible substrate having the thin transformer is attached to the device side.
Thin electronic components (15) arranged on the main board (14)
A double-sided adhesive tape (13) on the upper surface of the
Connecting the terminals of the flexible board to the main board
How to use a thin transformer characterized by.