JPH0727118U - coil - Google Patents

Abstract

(57) [Abstract] [Purpose] To prevent short circuit between the metal foil and the connection during soldering. [Structure] A strip-shaped metal foil 11 with an insulating layer 12 interposed.
To wind. Connection parts 14 are provided at both ends of the metal foil 11. The metal foil 11 and the connection portion 14 are cut into a predetermined width, and the coil body 13
To get Insulating layer between the connection part 14 and the adjacent metal foil 11
A short-circuit prevention part (15) having a cross-sectional width wider than the other insulating layer (12) is formed on (12). [Effect] The widened short-circuit prevention portion 15 prevents the solder 17 from contacting the metal foil 11 adjacent to the connection portion 14.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coil used for various electric parts such as a thin motor.

[0002]

[Prior art]

 Conventionally, a method of manufacturing this type of coil has been disclosed in Japanese Patent Application Laid-Open Nos. 1-295647 and 63-262047. That is, this is a method in which a strip-shaped metal foil is wound multiple times while interposing an insulating layer, and connecting terminals such as cylindrical terminals are provided at the beginning and end of the metal foil, and the wound metal foil and connection The winding body composed of the parts is cut at a predetermined width at right angles to the axial direction. Such flat coils are widely used, for example, as drive coils for thin motors. By soldering the connection parts provided on both ends of the metal foil, electrical connection between the coil body and the outside can be achieved. It is like this.

[0003]

[Problems to be solved by the device]

 The following problems are feared in the above-described conventional coil. FIG. 4 is a cross-sectional view showing a state where the coil body 2 is soldered and connected to the printed circuit board 1, 3 is an insulating layer having a substantially uniform cross section width, 4 is a metal foil, and 5 is formed on both ends of the metal foil 4. Reference numeral 6 denotes a solder for connecting the connection portion 5 and the printed circuit board 1. As shown in the figure, when there is a gap 7 between the printed circuit board 1 and the bottom of the coil body 2 when the coil body 2 is attached, the solder 6 flows along the gap 7 and the vicinity of the connection portion 5 There is a drawback that the metal foil 4 and the connecting portion 5 located at the position are short-circuited via the solder 6.

In view of the above problems, it is an object of the present invention to provide a coil capable of preventing a short circuit between a metal foil and a connecting portion during soldering with a printed circuit board or the like. .

[0005]

[Means for Solving the Problems]

 The coil according to the present invention is a coil formed by winding a strip-shaped metal foil while interposing an insulating layer, providing connection portions at both ends of the metal foil, and cutting the metal foil and the connection portion to a predetermined width. The cross-sectional width of the insulating layer located in the vicinity of the connection portion is formed wider than the cross-sectional width of the insulating layer located elsewhere.

[0006]

[Action]

 With the above structure, even if the solder flows from the connection part along the cut surface of the coil, the insulating layer near the connection part has a wider cross-sectional width than the insulating layers in other parts, so that the metal foil adjacent to the connection part On the other hand, solder does not contact.

[0007]

【Example】

 An embodiment of the present invention will be described below with reference to FIGS. In the figure, 11 is a strip-shaped metal foil rolled to a substantially uniform thickness of about several tens of microns, and an insulating layer 12 having a thickness of several microns is formed on one side of the metal foil 11. Reference numeral 13 denotes a coil body having a substantially fan-shaped cross section, which is formed by winding the metal foil 11 a plurality of times with the insulating layer 12 interposed, and then cutting this winding body at an arbitrary width at right angles to the axial direction. It was obtained. Then, at the start end and the end of the metal foil 11, a connection portion 14 for electrically connecting to the outside is provided. Further, at the stage of applying the insulating layer 12, only the starting end and the terminating end of the insulating layer 12 are formed thicker than the other portions, and the metal foil 11 and the insulating layer 12 are wound. Therefore, in the completed coil body 13, between the connecting portion 14 and the metal foil 11 adjacent to the connecting portion 14, the insulating layer 12 having a wider cross-sectional width than the insulating layer 12 located elsewhere is formed. The short circuit prevention part 15 is formed.

When the coil body 13 having the above-mentioned configuration is connected to the printed circuit board 16, as shown in FIG. 3, a land portion (not shown) formed in an appropriate place of the printed circuit board 16 and the connection portion 14 are connected to each other. Connect by 17. At this time, if there is a gap portion 18 between the bottom portion forming the cut surface of the coil body 13 and the printed circuit board 16, the solder 17 flows into the gap portion 18 from the connection portion 14 side. Since the wide short circuit prevention part 15 is formed in the vicinity, the solder 17 does not reach the metal foil 11 adjacent to the connection part 14, and the interlayer short circuit between the metal foil 11 and the connection part 14 is avoided. It

As described above, in the coil according to the present embodiment, the insulating layer 12 located in the vicinity of the connecting portion 14 is connected to the insulating layer 12 formed in the area other than the vicinity of the connecting portion 14 by the short-circuit prevention portion of the solder 17. By forming a wide cross-section width for the coil body 15, when soldering the coil body 13 for connection, even if solder 17 flows into the gap 18 between the coil body 13 and the printed circuit board 16, a short circuit is prevented. The part 15 makes it possible to prevent a short circuit between the metal foil 11 and the connection part 14.

Further, when the coil body 13 is manufactured, only the insulating layer 12 near the start end and the end of the metal foil 11 is thickly applied, and only the insulating layer 12 near the connecting portion 14 is covered with the insulating layer 12 at other portions. Since it can be formed wider than the cross-sectional width, the desired short-circuit prevention portion 15 can be easily obtained.

The present invention is not limited to the above embodiment, but various modifications can be made within the scope of the present invention. For example, the insulating layer in the vicinity of the connection portion can be made thicker in cross section by interposing another insulating material such as an insulating material or an insulating tape. Also, the same action and effect can be obtained by providing metal tubular terminals as connection portions at both ends of the metal foil and forming the short-circuit prevention portion in the vicinity of these tubular terminals.

[0012]

[Effect of device]

 According to the present invention, a strip-shaped metal foil is wound with an insulating layer interposed, connection portions are provided at both ends of the metal foil, and the metal foil and the connection portion are cut into a predetermined width. The cross-sectional width of the insulating layer located in the vicinity of the portion is formed wider than the cross-sectional width of the insulating layer located in the other part. It is possible to provide a coil capable of preventing a short circuit of the coil.

[Brief description of drawings]

FIG. 1 is a perspective view of a coil according to an embodiment of the present invention.

FIG. 2 is an enlarged front view of the main part of the same.

FIG. 3 is an enlarged sectional view of a main part of the same.

FIG. 4 is an enlarged cross-sectional view of a main part showing a conventional example.

[Explanation of symbols]

 11 Metal foil 12 Insulation layer 14 Connection part 15 Short circuit prevention part

Claims (1)

[Scope of utility model registration request] 1. A strip-shaped metal foil is wound while interposing an insulating layer, and connection portions are provided at both ends of the metal foil,
In the coil formed by cutting the metal foil and the connection portion to a predetermined width, the cross-sectional width of the insulating layer located near the connection portion is formed wider than the cross-sectional width of the insulating layer located elsewhere. Characteristic coil.