JPH0550708U - Sheet coil device - Google Patents

Abstract

(57) [Summary] [Purpose] Compact, with no displacement or deformation of connection terminals.
To obtain a sheet coil device capable of easily and surely performing a connecting work with a conductor pattern of a connection board. [Structure] A plurality of sheet coils 3 in which a coil 6 and lead wires 61 and 62 thereof are integrally formed with a conductor foil on both surfaces or one surface of an insulating sheet 5 are laminated on an upper surface 1a of a terminal block 1. Lead wires 61 and 62 formed by extending the coil 6 as they are are bent and fixed along the side surface 1b and the lower surface 1c of the terminal block 1.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a sheet coil device in which a plurality of sheet coils each having a coil formed of a conductor foil on both sides or one side of an insulating sheet are laminated and attached to the upper surface of a terminal block. It is used for coils.

[0002]

[Prior Art]

 Transformers and chokes using this sheet coil device have been widely used in recent years because they can be made small and thin. FIG. 6 is a side view of the seat coil device previously filed by the applicant (Japanese Patent Application No. 2-83144), and FIG. 7 is an exploded perspective view of the seat coil device. A plurality of sheet coils 3 are laminated as shown in FIG. 6 with the pin terminals 2 having a V-shape being molded and the pin terminals 2 being inserted into the terminal holes 4 formed in the sheet coil 3. To be done.

The sheet coil 3 of FIG. 7 is provided with a coil 6 formed of a conductor foil on each of the front surface and the back surface of the insulating sheet 5, and an insulating film (not shown) is attached to the upper surface of the coil 6. There is. A terminal hole 4 is formed at the outer end of the coil 6, and a through hole 7 is formed at the inner end of the coil 6, and the two coils 6 on the front surface and the back surface are connected to form a two-turn coil.

The sheet coil 3 stacked on the terminal block 1 is soldered to the pin terminals 2 with solder 8 to form a sheet coil device 9. Then, the middle leg of the E core 12, 13 divided into two is inserted into the insertion hole 10 provided in the terminal block 1 and the insertion hole 11 provided in the sheet coil 3, and the notch formed in the terminal block 1 The yoke portion of the E core 12 is fitted into the portion 14 to assemble the entire transformer.

In the sheet coil device 9 according to this prior art, the connection terminals 21 below the pin terminals 2 are positioned and placed so as to be positioned on the wiring pattern of a wiring board (not shown), and are connected by soldering. To be done.

[0006]

[Problems to be solved by the device]

 In the sheet coil device 9 according to the above-mentioned prior art, since the pin terminals 2 are molded on the terminal block 1, the terminal block 1 becomes large by that much. Further, if the connection terminal 21 of the pin terminal 2 is deformed to the left and right, a short circuit is likely to occur when the distance between the wiring patterns is narrow, and when the connection terminal 21 is deformed downward or upward, the connection terminal There was a problem that the reliability of soldering was impaired.

An object of the present invention is to solve the above-mentioned problems of the prior art and to obtain a smaller sheet coil device that can be easily and surely mounted on a wiring board.

[0008]

[Means for Solving the Problems]

 In order to achieve the above-mentioned object, the present invention draws a lead wire of a coil composed of a conductor foil to a predetermined length outside an edge of an insulating sheet, and places a sheet coil on a terminal board. When laminated, the lead wire is bent and fixed so as to extend along at least the side surface of the terminal block.

[0009]

[Action]

 According to this invention, the lead wire of the coil is bent along at least the side surface of the terminal block and fixed to the terminal block. Therefore, the pin terminals used in the prior art are not required, and the terminal block is downsized accordingly. Can be achieved. Further, since the lead wire of the coil formed of the conductor foil can be bent along the corner of the terminal block, the lead wire can be accurately fixed to the terminal block.

[0010]

Embodiment An embodiment of the present invention will be described below with reference to the drawings. 1 to 4 show a transformer according to a first embodiment, FIG. 1 is a partially broken perspective view, FIG. 2 is an exploded perspective view, FIG. 3 is a plan view of a sheet coil, and FIG. 4 is a cross section of a through hole. It is a figure.

In FIGS. 1 and 2, a connection terminal 30 made of a conductor foil is plated from the side surface 1b of the resin terminal block 1 to the lower surface 1c. Further, the corners of the upper surface 1a and the side surface 1b of the terminal block 1 and the corners of the side surface 1b and the lower surface 1c are appropriately formed so that the lead lines 61 and 62 of the coil 6 which will be described later can be easily bent along the surfaces. It is formed on a curved surface.

As shown in FIG. 3, the sheet coil 3 has coils 6 formed on both sides of an insulating sheet 5 with conductive foils, and as shown in FIG. The inner ends of the coil 6 are connected to each other to form a two-turn coil. The lead-out end (outer end) of each coil 6 in FIG. 3 is formed by pulling out the conductor foil forming the coil 6 from the end edge of the insulating sheet 5 to a predetermined length, and pulling out the lead wires 61, 62. Are configured. 3 (b) is a perspective view showing the shape of the coil 6 on the back surface. The coil 6 shown in FIG. 3 (b) is formed on the back surface of the sheet coil 3 shown in FIG. 3 (a). There is.

As shown in FIG. 2, four sheet coils 3 are laminated on the upper surface 1 a of the terminal block 1 by changing the direction of the lead wire, and the middle leg of the E core 15 is inserted into the insertion hole of the terminal block 1. 10 and the insertion holes 11 of the sheet coil 3, respectively, and the I core 16 is overlapped from above and fixed as a whole.

The lead wires 61 and 62 are respectively bent from the side surface 1b of the terminal block 1 along the lower surface 1c as shown in FIG. 1 and soldered to the connecting terminals 30 on the side surface 1b and the lower surface 1c in a surface contact state. It is fixed. At this time, since the thin lead wires 61, 62 hit the corners of the terminal block 1 in line contact with each other, the position of the bent portion is accurately determined. Positioned accurately without shifting to.

Therefore, a misconnection in which the lead wires 61 and 62 are mistakenly connected to the adjacent connection terminal 30 and a short circuit due to contact between the adjacent lead wires 61 and 62 are prevented. Further, since the leader lines 61, 62 are not displaced, the leader lines 61, 62 wrapping around the side surface 1b or the lower surface 1c are unexpectedly deformed, and the connection terminals 30 and the wiring pattern (not shown) of the wiring board are separated. There is no risk of poor bonding. The leader lines 61, 62 may be shortened so as not to reach the lower surface 1c and soldered only on the side surface 1b.

FIG. 5 shows a second embodiment, in which the insulating sheet 5 is provided with extension parts 51 and 52, and lead lines 61 and 62 are formed in these extension parts 51 and 52. In this way, when the leader lines 61 and 62 are also formed on the insulating sheet, the leader lines 61 and 62 can be formed in the same step as the coil 6 is formed on the insulating sheet body 5, so that the productivity is improved. Improvement is expected. In this case, the lead wires 61 and 62 are formed on both front and back surfaces of the extension portions 51 and 52 for connection to the connection terminal 30 of FIG. 2 and connection to the conductive pattern of the lower wiring board. The front and back are electrically connected by the through hole 7A.

Although the lead wires 61 and 62 are soldered to the connection terminal 30 in the above-described embodiment, unlike this, the lead wires 61 and 62 are not attached to the terminal block 1 in advance, and the lead wires 61 and 62 are bonded with an adhesive. It may be used to directly fix only to the side surface 1b and the lower surface 1c of the terminal block, or only the side surface 1b. In that case, the lead wires 61 and 62 themselves serve as connection terminals to the conductive pattern of the wiring board.

In the above embodiment, the transformer including the E core and the I core has been described as an example, but the present invention can be similarly applied to a transformer without a core. It can also be applied to choke coils and filters, and also to sheet coils in which a coil is formed from a conductor foil on only one side of an insulating sheet.

[0019]

[Effect of the device]

 According to this invention, since it is not necessary to provide the pin terminal 2 used in the prior art shown in FIGS. 4 and 5, the size can be reduced accordingly. In addition, since the lead wire formed integrally with the coil by the conductor foil is bent and fixed so as to extend along at least the side surface of the terminal block, the lead wire can be fixed at an accurate position of the terminal block. This prevents misconnections, short circuits, and poor connections with the conductor patterns on the wiring board.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a first embodiment of the present invention.

FIG. 2 is an exploded perspective view of the same embodiment.

FIG. 3 is a plan view of the sheet coil of the embodiment.

FIG. 4 is an enlarged sectional view showing a through hole of the sheet coil.

FIG. 5 is a plan view of a sheet coil showing a second embodiment.

FIG. 6 is a side view of a transformer according to the prior art.

FIG. 7 is an exploded perspective view of the transformer of this prior art example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Terminal block, 1b ... Side surface, 1c ... Lower surface, 3 ... Sheet coil, 5 ... Insulating sheet, 6 ... Coil, 7 ... Through hole,
9 ... Sheet coil device, 10 ... Insertion hole, 11 ... Insertion hole,
61, 62 ... Leader lines.

Claims (1)

[Scope of utility model registration request] 1. A sheet coil device comprising a sheet coil having a coil formed of a conductor foil on at least one surface of an insulating sheet and mounted on a terminal block. Is also drawn outward to form a leader line, and the leader line is bent along at least the side surface of the side surface and the lower surface of the terminal block and fixed to at least the side surface of the terminal block. A sheet coil device characterized in that