JP2004342911A - Surface mounting coil-wound component - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a surface mounting coil-wound component capable of enhancing the reliability of packaging. <P>SOLUTION: The surface mounting coil-wound component is characterised by being provided with a core main body 11 having a central core part 12 on which a coil 19 is to be wound and opposite end score parts 13 provided integrally at the opposite end parts of the central core part, connection terminals 17 provided at the opposite end score parts and being connected with the coil, and packaging terminals 22 independent from the connection terminals each having a connection hole 23 being inserted with the connection terminal and a part 24 for connection with a printed board, or the like. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a surface-mount coil-wound component such as a transformer and a trigger coil used for an optical device such as a camera or a small electronic device.
[0002]
[Prior art]
A small transformer used for an optical device such as a camera or a small electronic device is stored in a limited narrow space of the optical device or the small electronic device.
[0003]
Therefore, a transformer having a structure in which a core is mounted on the upper part of a bobbin is known to satisfy the above-mentioned requirement (for example, see Patent Document 1). The core of the transformer includes a main core having a shunt core at both ends of a central core around which the coil is wound, an outer core connecting the respective shunt cores on both sides of the main core, and a main core. And a plurality of terminal pin fixing plates formed with a fitting portion fitted to the shunt core portion and a cutout portion for guiding the central core portion to substantially the center.
[0004]
After the terminal pin fixing plate is fitted and fixed to the shunt core portion of the main core, a coil is wound around the central core portion, and then the outer core is fixed to the shunt core portion.
[0005]
[Patent Document 1]
Japanese Patent Publication No. 6-48651
[Problems to be solved by the invention]
However, the small transformer configured as described above has a structure in which a core is mounted on a bobbin, and the height of the transformer is equal to the height of the bobbin plus the height of the core. Therefore, even if the height dimensions of the bobbin and the core are made as small as possible, there is a limit to the reduction in thickness because of the vertically stacked structure.
[0007]
In addition, the terminal pins are inserted into the bobbin base of the bobbin, and the terminal pins protrude below the bobbin base. Therefore, when the coil is wound around the central core portion and then impregnated in varnish or the like, the varnish adheres to the terminal pin, causing a mounting failure, or the flux remains attached to the terminal pin, which causes a mounting failure. Sometimes.
[0008]
Furthermore, there is a possibility that the terminal pins may be deformed or broken in the winding step of winding the coil around the central core portion, which may affect the mounting step.
[0009]
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a surface-mounted coil-wound component having high reliability without causing a mounting failure of a terminal due to varnish or flux. It is in.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned object, the present invention is directed to a core having a central core portion around which a coil is wound and both end core portions or bobbin portions provided integrally at both ends of the central core portion. A main body or a bobbin main body, a connection terminal provided on the both-end core portion or the bobbin portion, connected to the coil, and a separate member from the connection terminal, a connection hole inserted into and connected to the connection terminal, a printed circuit board, and the like. And a mounting terminal having a connection portion connected to the surface mounting coil.
[0011]
According to a second aspect, the connection terminal according to the first aspect is provided so as to vertically penetrate the core portion or the bobbin portion at both ends, and a binding portion of the coil is provided at a portion protruding upward from the core portion or the bobbin portion at both ends. And an insertion portion inserted and connected to the connection hole of the mounting terminal at a portion protruding downward.
[0012]
A third aspect of the present invention is characterized in that the mounting terminal of the first aspect is provided on a terminal block made of an insulating material, and has a connection hole on an upper surface and a connection section on a lower surface.
[0013]
According to the above configuration, the cores at both ends of the core and the terminal block are separate structures. Therefore, in a state where the terminal block having the mounting terminals is not provided, a winding step of winding the coil around the central core portion mainly composed of the core, the coil is wrapped around the tying portion of the connection terminal, and then the varnish is applied. Since it is impregnated, insulating materials such as varnish and flux do not adhere to the mounting terminals of the terminal block.
[0014]
In addition, insulating materials such as varnish and flux may adhere to the connection terminals and remain. However, when the connection terminals are inserted into the connection holes of the mounting terminals, the insulating material such as varnish or flux attached to the connection terminals may be removed. The material is scraped off by the inner peripheral edge of the connection hole. Therefore, the connection terminals and the mounting terminals are reliably electrically connected and mechanically connected.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
1 to 3 show a first embodiment, FIG. 1 is a perspective view of a surface mount transformer as a coil-wound component, FIG. 2 is an exploded perspective view of the surface mount transformer, and FIG. 3 shows a terminal block. (a) is a perspective view, (b) is a cross-sectional view, and (c) is a perspective view of a mounting terminal. As shown in FIGS. 1 to 3, the core main body 11 is formed of a material having low electrical insulation such as a manganese-based ferrite material, and has a flat rectangular central core portion 12 around which a coil is wound. Both ends of the central core portion 12 are integrally formed in a direction perpendicular to the both ends. In addition, the core main body may be a bobbin main body of the mold member.
[0017]
The two-end core portion 13 has a rectangular plate-shaped main portion 14 projecting from the end surface of the central core portion 12 in the up-down direction and in the left-right direction. Projection 15 is provided. Accordingly, cutouts 16a and 16b are formed in the upper and lower portions of the protrusion 15.
[0018]
Further, a pair of metal rod-shaped connection terminals 17 are provided on the protrusion 15 so as to penetrate in the vertical direction, and the binding portion 17a at the upper end of the connection terminal 17 projects into the notch 16a and the insertion portion 17b at the lower end. Protrudes into the notch 16b. Further, a concave groove 18 is provided in the main body 14 corresponding to the pair of connection terminals 17. The terminal 19a of the coil 19 wound around the central core portion 12 is connected to the binding portion 17a of the connection terminal 17 through the concave groove 18 and then soldered.
[0019]
On the other hand, reference numeral 20 denotes a terminal block formed of the same material as the core main body 11, and is formed in a prismatic shape so as to be engaged with the cutout portions 16b of the core portions 13 at both ends. The terminal block 20 is provided with a pair of through-holes 21 corresponding to the distance between the connection terminals 17 so as to penetrate vertically. Further, a mounting terminal 22 is inserted into a side portion of the through hole 21 of the terminal block 20.
[0020]
The mounting terminal 22 is formed by bending both ends of a strip-shaped metal plate into an L-shape. A connection hole 23 is provided at an upper end and a connection portion 24 is provided at a lower end. The connection hole 23 faces the upper end opening of the through hole 21 of the terminal block 20, and when the insertion portion 17 b of the connection terminal 17 is inserted, the connection hole 23 is in the shape of a petal that can be spread out, and is electrically and mechanically connected to the connection terminal 17. It is designed to be connected. Further, the connection portion 24 of the mounting terminal 22 is exposed on the lower surface of the terminal block 20, and is connected to a conductive film of a printed circuit board (not shown) by soldering or the like.
[0021]
As described above, the terminal blocks 20 that are separate from the both ends of the core main body 11 are attached to the core main bodies 11, and the central core section 12 of the core main body 11 is provided without the terminal blocks 20. The terminal 19a of the coil 19 is entangled with the entangled portion 17a of the connection terminal 17 and soldered. Then, it is impregnated with varnish.
[0022]
Therefore, an insulating material such as varnish or flux may adhere to the connection terminals 17 and remain. However, when the insertion portion 17b of the connection terminal 17 is positioned in the through hole 21 of the terminal block 20 and the insertion portion 17b is inserted into the connection hole 23 of the mounting terminal 22, the connection terminal 17 and the mounting terminal 22 are electrically connected. .
[0023]
At this time, an insulating material such as a varnish or a flux may remain attached to the insertion portion 17b of the connection terminal 17, but if the insertion portion 17b is inserted into the petal connection hole 23, the connection hole 23 The insulating material adhered to the connection terminal 17 is scraped off by the inner peripheral edge of. Therefore, the connection terminal 17 and the mounting terminal 22 are reliably electrically connected and mechanically connected, and the terminal block 20 is in a state of being engaged with the notch 16 b of the core portion 13 at both ends.
[0024]
Further, since a terminal block 20 separate from the core section 13 of the core main body 11 is separately attached thereto, there is no possibility that an insulating material such as varnish or flux adheres to the mounting terminal 22 of the terminal block 20, In addition, when the surface mounting transformer is mounted on the printed circuit board 25, the connection portions 24 of the mounting terminals 22 can be reliably reflow-soldered to the conductive film 26 without deformation of the connection portions 24 of the mounting terminals 22. Performance can be improved.
[0025]
In the embodiment, the mounting terminal 22 is provided on the terminal block 20, and the mounting terminal 22 of the terminal block 20 is connected to the connection terminal 17 of the core main body 11, and the terminal block 20 is fixed to the core main body 11 at the same time. However, the terminal block 20 is not necessarily provided, and the mounting terminal 22 may be directly connected to the connection terminal 17 of the core main body 11.
[0026]
Also, a petal-shaped connection hole 23 is provided in the mounting terminal 22, and an insulating material such as varnish or flux attached to the insertion portion 17 b of the connection terminal 17 is scraped off by the inner peripheral edge of the connection hole 23. It is not limited to the shape of the hole, but may be any as long as it can be connected in an electrically conductive state by insertion.
[0027]
In the above-described embodiment, the surface mount transformer has been described. However, a trigger coil may be used, and any surface mount coil wound part can be adopted. In addition, the core is formed of a material having low electrical insulation such as a manganese-based ferrite material, but the material of the core is not limited.
[0028]
Note that the present invention is not limited to the above-described embodiment as it is, and can be embodied by modifying constituent elements in an implementation stage without departing from the scope of the invention. In addition, various inventions can be formed by appropriately combining a plurality of constituent elements disclosed in the embodiments. For example, some components may be deleted from all the components shown in the embodiment. Further, components of different embodiments may be appropriately combined.
[0029]
【The invention's effect】
As described above, according to the present invention, the mounting terminals are provided separately from the connection terminals provided on the core or bobbin portions at both ends of the core or bobbin, and the mounting terminals can be inserted and connected to the connection terminals. With this configuration, it is possible to wind a coil around the central core portion mainly composed of the core or to impregnate the varnish with the varnish, without mounting terminals. Therefore, insulating material such as varnish or flux does not adhere to the mounting terminals, and the reliability of mounting on a printed circuit board or the like can be improved.
[0030]
Even when insulating material such as varnish or flux is attached to the connection terminal, when the connection terminal is inserted into the connection hole of the mounting terminal, the insulating material such as varnish or flux attached to the connection terminal is removed from the connection hole. Is scraped off by the inner peripheral edge. Therefore, there is an effect that the connection terminal and the mounting terminal are reliably electrically connected and mechanically connected.
[Brief description of the drawings]
FIG. 1 is a perspective view of a surface mount transformer according to a first embodiment of the present invention.
FIG. 2 is an exploded perspective view of the surface mount transformer of the embodiment.
3A and 3B show the terminal block of the embodiment, wherein FIG. 3A is a perspective view, FIG. 3B is a sectional view, and FIG. 3C is a perspective view of a mounting terminal.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 ... Core main body, 12 ... Central core part, 13 ... Core part at both ends, 17 ... Connection terminal, 19 ... Coil, 20 ... Terminal block, 22 ... Mounting terminal, 23 ... Connection hole, 24 ... Connection part

Claims (3)

A core main body or a bobbin main body having a central core portion around which the coil is wound and both end core portions or bobbin portions provided integrally at both ends of the central core portion,
A connection terminal provided on the both-end core portion or the bobbin portion and connected to the coil, and a separate member from the connection terminal, a connection hole inserted into the connection terminal and a connection portion connected to a printed circuit board or the like; A mounting terminal having
A surface-mounted coil-wound component comprising: The connection terminal is provided to penetrate the both-end core portion or bobbin portion in a vertical direction, has a binding portion of a coil in a portion protruding upward from the both-end core portion or bobbin portion, and has a portion protruding downward. The surface-mounted coil-wound component according to claim 1, further comprising an insertion portion inserted and connected to the connection hole of the mounting terminal. The surface-mounted coil-wound component according to claim 1, wherein the mounting terminal is provided on a terminal block made of an insulating material, and has a connection hole on an upper surface of the terminal block and a connection portion on a lower surface.

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