JP2601406Y2 - coil - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a coil such as a thin layered coil mounted on a substrate or the like, and particularly to a structure of a base thereof.

[0002]

2. Description of the Related Art Thin layered coils are advantageous in reducing the thickness of electronic devices, and are therefore widely used as electronic components such as inductors, transformers, and filters mounted on substrates and the like. Conventionally, a base used for this kind of thin layered coil has a structure as shown in FIG. 5 and is made of a rectangular flat insulating material. In the center of the base 1, there is provided a penetrating core hole 2 into which the core 8 of the core 5 to be assembled is inserted. Are laminated, and a plurality of terminals 9 for terminating the plate of the conductor 6 are provided at both ends. The conductor 6 is connected to the connection terminal portion 4 of the terminal 9 with solder or the like so as to form a winding around the core hole 2. A coil is formed by assembling the core 5 with the base 1 described above. As described above, in the conventional base 1, the connection between the plate of the conductors 6 stacked on the flat upper surface 11 and the connection terminal portions 4 is performed by soldering. As shown in FIG. 6, a fillet of solder 12 is formed only on the upper surface of the conductor 6, as shown in FIG. On the other hand, on the lower surface, a gap 1 between the base 1 and the lower conductor 6 is provided.
5 is small, and no fillet is formed between the lower conductor 6 and the terminal 9, so that the connection area between the lower conductor 6 and the terminal 9 is small, and when energized, this portion may generate heat or break. However, there is a problem that reliability is reduced when a coil is formed.

[0003]

The problem to be solved by the present invention is to provide a highly reliable coil that has a structure that can solve the above-mentioned problems and can secure a sufficient connection area between the terminal and the conductor. To provide.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a thin coil, such as a thin layered coil, which has a rectangular flat plate having a through hole at the center and a plurality of terminals implanted at both ends. The area around the terminal planting portion on the surface on which the conductor plates constituting the conductors are to be laminated is processed one step lower, and the shape of the connection terminal portion of the terminal exposed from this surface is formed in a convex shape, and the lower base portion of the convex shape is formed. The size of the conductor is designed to be larger than the joint hole provided at the end of the conductor, and around this terminal, a predetermined gap is formed between the base surface and the conductor without the conductor falling below the convex lower base. This is a coil using a base designed to obtain the structure. That is, the present invention is made of an insulating material, has a rectangular flat plate shape, is provided with a through-hole in the center of which a core portion of a core is inserted, and has a connection terminal portion connected to a conductor at both ends thereof, and a connection terminal portion formed on a substrate at the time of mounting. In a coil using a base on which a plurality of terminals each having a mounting terminal portion to be connected are planted, portions where the terminals are planted at both ends of a surface of the base on which the conductors are laminated are stepped one step lower, and The connection terminal portion of the terminal is processed into a convex shape, the height of the lower pedestal portion is substantially the same as the surface on which the conductor is laminated, and the size is larger than the joint hole of the conductor. Coil.

[0005]

The peripheral portion of the terminal planting position on the upper surface of the base is stepped lower by one step, the connection terminal portion of the exposed portion of the terminal planted here is formed in a convex shape, and the height of the lower pedestal portion is substantially reduced. The height is about the same level as the solder fillet, the size is larger than the size of the joining hole at the end of the conductor plate, and the terminal is shaped so that the conductor plate does not go below it. A necessary gap is obtained between the base surface and the conductor in a reliable manner, a reliable solder finish can be achieved, and a sufficient connection area can be ensured.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an external perspective view of a base used for a coil according to an embodiment of the present invention. FIG. 2 is an external perspective view of the coil of the present invention. FIG. 3 is a side view showing the vicinity of the connection terminal portion of the base used in the coil of the embodiment shown in FIG.
4A and 4B are views showing the vicinity of the connection terminal portion of the base used for the coil of the present invention, FIG. 4A is a side view, and FIG. 4B is a front view. The base used in the coil of the present invention is a rectangular flat plate made of an insulating material as shown in FIG. In the center of the base 1, there is provided a core hole 2 into which the core of the core to be assembled is inserted. In the present embodiment, an example will be described in which an insulating protrusion 10 is provided between the conductor and the core around the core hole 2. At both ends of the base 1 as terminals 9
A mounting terminal portion 3 used for mounting on a substrate and a convex connection terminal portion 4 for connecting a conductor plate are implanted so as to be exposed on the side surface and the upper surface, respectively. The height of the lower portion (pedestal portion 13) of the convex connection terminal portion 4 is the same as or slightly lower than the laminated surface 11 on which the conductor plates on the upper surface of the base 1 are laminated. The upper part of the convex shape is designed to fit into the joining hole (14 in FIG. 5) at the end of the conductor, and the size of the lower pedestal portion 13 is designed to be larger than the joining hole. As in the assembly of the conventional thin laminated coil described with reference to FIG. 5, a conductor plate is laminated on the base 1 on which the terminals 9 are planted, and the joining holes at the ends thereof are fitted into the connection terminal portions 4. In this case, the terminals 9 are sequentially shifted one by one, a plurality of windings are formed around the core hole 2, a predetermined number of conductors are stacked, connected to the terminals, and a predetermined number of windings as shown in FIG. An inductor, a transformer and the like are configured (in this example, a three-turn inductor is formed at both ends of one terminal as shown in FIG. 2). The conductor 6 and the terminal 9 are solder-finished in order to electrically join them reliably. As shown in FIG. 3, a gap 15 is formed between the conductor 6 and the base surface by the height of the pedestal portion 13 of the terminal 9 having a convex shape. Twelve fillets are formed, and a sufficient connection area between the conductor 6 and the connection terminal portion 4 is ensured. When the base of the present invention is used, since the connection terminal portion has a convex shape, even if the end of the conductor is slightly deformed, a minimum gap is secured by the protrusion of the pedestal portion under the convex shape. ,
Since the solder is always formed so that a normal fillet is formed in both the upper and lower directions, a coil having good workability and excellent reliability can be manufactured.

[0007]

[Effects of the Invention] As described above, according to the present invention, a sufficient connection area can be secured between the conductor and the terminal, and a highly reliable coil free from heat generation or disconnection during energization can be obtained.
Also, it has become possible to provide a thin inductor, transformer, filter and the like which are easy to assemble and have high reliability.

[Brief description of the drawings]

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

FIG. 2 is an external perspective view of the coil of the present invention.

FIG. 3 is a side view showing the vicinity of a connection terminal portion of a base used in the coil of the embodiment shown in FIG. 2;

FIG. 4 is a view showing the vicinity of a connection terminal portion of a base used for the coil of the present invention. 4A is a side view, and FIG. 4B is a front view.

FIG. 5 is an exploded perspective view illustrating the assembly of a conventional thin laminated coil.

FIG. 6 is a diagram showing the vicinity of a connection terminal portion of a base used for a conventional thin layered coil. FIG. 6A is a side view, and FIG. 6B is a front view.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Base 2 Core hole 3 Mounting terminal part 4 Connection terminal part 5 Core 6 Conductor 7 Solder 8 Core (of core) 9 Terminal 10 (For insulation) 11 Lamination surface 12 Solder 13 Base part 14 Joint hole 15 Gap

Claims (1)

(57) [Scope of request for utility model registration] 1. A rectangular flat plate made of an insulating material,
A through hole is provided at the center of the core, into which the core of the core is inserted. At both ends, a base is used in which a plurality of terminals consisting of connection terminal parts connected to conductors and mounting terminal parts connected to the board during mounting are planted. In the coil, the portions where the terminals are planted at both ends of the surface of the base on which the conductors are laminated are processed one step lower, the connection terminal portions of the terminals are processed into a convex shape, and the lower pedestal portion A coil having substantially the same height as a surface on which the conductor is laminated, and having a size larger than a joint hole of the conductor.