JPH0660112U - coil - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] To provide a thin coil with a structure that can secure a sufficient connection area between the connection terminal part of the terminal and the conductor of the coil. [Structure] A coil 6 is assembled by assembling a coil conductor 6 and a core 5. The coil is made of an insulating material, has a rectangular flat plate shape, and is provided with a center hole 2 into which a center part of the core 5 is inserted. A base 1 in which a plurality of terminals 9 each consisting of a connection terminal portion 4 connected to a conductor 6 for a coil and a mounting terminal portion 3 connected to a substrate at the time of mounting are planted at both ends thereof, and a conductor on the upper surface of the base 1 is provided. Both ends of the surface on which 6 is laminated are processed to be one step lower, and the terminal 9 is planted in the step portion, and the structure of the terminal 9 is such that the lower portion (the pedestal portion 13) of the connection terminal portion 4 is fitted to this upper portion. It is a coil using the base 1 processed into a convex shape larger than the size of the connecting hole of the conductor 6.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coil such as a thin layered coil mounted on a substrate or the like, and particularly to the structure of its base.

[0002]

[Prior art]

 Thin layered coils are widely used as electronic components such as inductors, transformers, filters, etc., which are mounted on a substrate or the like because they are advantageous for thinning electronic devices. Conventionally, a coil base used in this type of thin laminated coil has a structure as shown in FIG. 2 and is made of a rectangular flat plate-shaped insulating material. At the center of the base 1, there is provided a through hole 2 for inserting the core 8 of the core 5 to be assembled. On the upper surface of the base 1, a plate of a substantially C-shaped conductor 6 that constitutes a coil is formed. Are laminated, and a plurality of terminals 9 at which the plates of the conductor 6 are terminated are planted 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. The core 5 is assembled to the above-described base 1 to form a coil. As described above, in the conventional coil base 1, the laminated surface is flat, and the terminals 9 having the rectangular connection terminal portions 4 are embedded at both ends thereof. The plates of the conductors 6 for the coil are stacked on each other, and the connection between the plates of the conductors 6 and the connection terminal portions 4 is performed by soldering. However, in the conventional base, the conductors 6 are closely attached to the base 1 around the connection terminal portions 4. As shown in FIG. 5, the solder 12 connecting the conductor 6 and the connection terminal portion 4 has a fillet (crown-shaped winding) of the solder 12 formed only on the upper surface of the conductor 6. On the other hand, since the gap 15 between the base 1 and the lower conductor 6 is small on the lower surface and no fillet is formed between the lower conductor 6 and the terminal 9, the connection area between the lower conductor 6 and the terminal 9 is small. However, when energized, there is a drawback that this part generates heat or is broken, and when a coil is constructed, there is a problem that reliability is reduced.

[0003]

An object of the present invention is to provide a base having a structure that can secure a sufficient connection area between a connection terminal portion of a terminal and a conductor of a coil, which solves the above-mentioned problems, and has high reliability. It is to provide a coil.

[0004]

[Means for Solving the Problems]

 The present invention is a base for forming a thin coil such as a thin layered coil, which has a through hole in the center and a rectangular plate shape in which a plurality of terminals are planted at both ends, and the winding is formed. The area around the terminal implantation area on the surface where the conductor plates are stacked is processed one step lower, and the shape of the connection terminal portion of the terminal exposed from this surface is made convex so that the size of the lower pedestal part is convex. Is designed to be larger than the connecting hole provided at the end of the conductor, and around this terminal, a predetermined gap can be obtained between the base surface and the conductor without the conductor dropping below the pedestal part of the lower part of the convex shape. It is a coil that uses a base designed for 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 into which the center part of the core is inserted, and at both ends thereof, connecting terminal parts for connecting to a conductor for a coil. In a coil using a coil base in which a plurality of terminals, which are connected to the board at the time of mounting, are mounted, the ends of the upper surface of the base on which the coil conductors are laminated are lowered by one step. Processed, the terminal was planted in this step, and the structure of the terminal was processed so that the lower part (pedestal part) of the connection terminal part was larger than the size of the connecting hole of the conductor to fit on this upper part. It is a coil characterized by using a base.

[0005]

[Action]

 The peripheral part of the terminal installation position on the top surface of the base is stepped one step lower, and the connection terminal part of the exposed part of the terminal planted here is made into a convex shape, and the height of the lower pedestal part is about a step difference. The height of the solder fillet is about the same as the solder fillet, and the size is larger than the size of the connecting hole at the end of the conductor plate, so that the conductor plate has a shape that does not go below it. The necessary clearance is obtained between the base surface and the conductor, and the solder finish can be done reliably, and the connection area is secured sufficiently.

[0006]

【Example】

 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 exploded perspective view showing the assembly of a coil using a conventional thin layered coil base. FIG. 3 is an external perspective view of the coil of the present invention. FIG. 4 is a side view showing the vicinity of the connection terminal portion of the base portion used for the coil of the embodiment shown in FIG. 5A and 5B show the periphery of a connection terminal portion of a base portion used in a conventional thin layered coil, FIG. 5A is a side view, and FIG. 5B is a front view. 6A and 6B show the periphery of the connection terminal portion of the base portion used for the coil of the present invention, FIG. 6A is a side view, and FIG. 6B is a front view. As shown in FIGS. 1 and 3, the base used in the coil of the present invention is a rectangular flat base 1 made of an insulating material. 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, and in this embodiment, an insulating protrusion 10 between the conductor and the core is provided around the core hole 2. An example will be explained. The terminals 9 are embedded at both ends of the base 1 so that the mounting terminal portions 3 used at the time of board mounting and the convex connecting terminal portions 4 for connecting the conductor plate for the coil are exposed on the side surface and the upper surface, respectively. Has been done. The height of the lower portion (the pedestal portion 13) of the convex-shaped connecting terminal portion 4 is the same as or slightly lower than the loading surface 11 on which the conductor plate on the upper surface of the base 1 is loaded. The upper portion of the convex shape has a size that can be fitted into the joining hole (see 14 in FIG. 2) 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 case of assembling the conventional thin laminated coil described in FIG. 2, a coil conductor plate is stacked on the base 1 in which the terminals 9 are embedded, and the bonding holes at the ends are formed in the base 1. It is fitted into the connection terminal portion 4, and at this time, the terminals 9 are sequentially shifted one by one to form a plurality of windings around the core hole 2, and a predetermined number of conductors are piled up and connected to the terminals. An inductor, a transformer, etc. having a predetermined number of turns as shown in (3) are constructed (in this example, a three-turn inductor is formed at both ends of one terminal as shown in FIG. 3). Finish half-finished in order to securely connect the conductor 6 and the terminal 9 electrically. As shown in FIG. 4, 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. Therefore, as shown in FIG. 12 fillets are formed, and a sufficient connection area is secured between the conductor 6 and the connection terminal portion 4. When forming a coil using the base of the present invention, since the connecting terminal part has a convex shape, even if the end part of the conductor is slightly deformed, the protruding part of the pedestal part under the convex part causes a minimum gap. Since it is secured and soldered so that normal fillets are always formed in both upper and lower directions, a coil with good workability and excellent reliability could be manufactured.

[0007]

[Effect of device]

 As described above, according to the present invention, a sufficient connection area can be secured between the conductor and the terminal, a highly reliable coil that does not have a failure such as heat generation and disconnection when energized, and is easy to assemble. It has become possible to provide thin inductors, transformers, filters, etc. with high reliability.

[Brief description of 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 exploded perspective view showing the assembly of a coil using a conventional thin layered coil base.

FIG. 3 is an external perspective view of the coil of the present invention.

FIG. 4 is a side view showing the periphery of the connection terminal portion of the base portion used for the coil of the embodiment shown in FIG.

5A and 5B show the periphery of a connection terminal portion of a base portion used in a conventional thin layered coil, FIG. 5A is a side view, and FIG. 5B is a front view.

6A and 6B show the periphery of a connection terminal portion of a base portion used for the coil of the present invention, FIG. 6A is a side view, and FIG. 6B is a front view.

[Explanation of symbols]

 1 Base 2 Core Hole 3 Mounting Terminal 4 Connection Terminal 5 Core 6 Conductor 7 Solder 8 Core 8 (Core) Core 9 Terminal 10 (For Insulation) Protrusion 11 Laminated Surface 12 Solder 13 Pedestal Part 14 Bonding Hole 15 Gap

Claims (1)

[Scope of utility model registration request] 1. A rectangular flat plate made of an insulating material,
A through hole is provided in the center for inserting the core part of the core, and a plurality of terminals, each of which has a connecting terminal part for connecting to a coil conductor and a mounting terminal part for connecting to a board at the time of mounting, are planted at both ends thereof. In the coil using the coil base, both ends of the surface of the upper surface of the base on which the coil conductors are laminated are processed to have a step lower by one step, and the terminal is planted in the step portion, and the structure of the terminal is A coil using a base in which a lower portion (a pedestal portion) of a connection terminal portion is processed into a convex shape larger than a size of a connecting hole of a conductor fitted to the upper portion.