JPH0726819Y2 - Coil / transformer for surface mounting - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a structure of a coil transformer that can be surface-mounted on a conductor on a surface of a printed circuit board.

[Contents and problems of conventional technology] Conventionally, this type of coil / transformer terminal structure to be mounted on a printed circuit board has a metal core pin terminal planted in the collar portion of the winding core and wound around the root of the pin terminal. The structure is such that the lead end of the wire is pulled up and soldered, the shape of the tip of the pin terminal is adjusted, the tip of the pin terminal is inserted into the pin insertion hole provided on the board mounting surface, and soldered and fixed. . Due to such a structure, surface mounting cannot be performed, and when the lead terminal of the winding is twisted to the pin terminal, the twisted portion of the lead terminal of the pin terminal is loosened and the lead terminal of the pin terminal is also loosened. There was a defect that the barbed part of the terminal fell out. In addition, several pin terminals are planted, the shape becomes complicated and the price is expensive.If the lead terminals of the winding are not securely connected to the pin terminals, poor conduction between the board and coil / transformer. However, there are drawbacks such as that, and that it cannot be automatically mounted on a substrate by using an automatic machine.

[Purpose of device]

The present invention forms a coil transformer having a barb terminal that can be directly surface-mounted on a surface conductor of a board, so that a surface-mounting terminal that is integrally formed with a lower flange and is flush with the bottom surface of the flange and in parallel therewith. The surface mounting terminals have a simple shape and can be manufactured at low cost, and the lead terminals of the windings can be directly connected to the board conductor without the windings coming loose or coming off. It is an object of the present invention to provide a surface-mounting coil / transformer having a barbed terminal, which is inexpensive and can be automatically mounted without causing any trouble.

[Explanation of the configuration of the device]

According to the present invention, a cylindrical core made of a resin or ceramic insulating material is provided with lower flanges protruding outward at both upper and lower ends, and an end surface of the lower flange is further extended outward.
A coil bobbin provided with a letter-shaped protrusion is formed, a winding is applied to the cylindrical winding core to form a winding portion, and lead ends at the beginning and end of winding of the winding portion are connected to the T-shaped protrusion. Peeling, pre-soldering the barb, EI type, EE type, UU type, UI
A magnetic core made of a magnetic material such as a mold is incorporated in the coil bobbin, the magnetic core is fixed with metal fittings, adhesive tape or the like to form a coil transformer, and the barbed portion of the T-shaped protrusion is used as a substrate conductor. A coil transformer for surface mounting, which is directly connected as a barbed terminal for surface mounting, is configured.

〔Example〕

FIG. 1 shows a coil transformer for surface mounting according to the present invention,
It is a perspective view showing the structure of a coil bobbin. The coil bobbin is provided with an upper flange and lower flanges 3 and 4 of a cylindrical core 1 made of an insulating material, and a T-shaped protruding portion 5 is integrally formed with the lower flange 4 on an end surface of the lower flange 4 of the coil bobbin. Four
The structure is the same as the bottom surface of the and protrudes parallel to the bottom surface. In FIG. 1, two pairs of the T-shaped protrusions are provided on the end faces of the lower collar 4 which face each other. The T-shaped protrusion 5 has a neck portion 15 around which a lead terminal is wound, and the neck portion 15 has a certain thickness, width and length. The T-shaped protrusion 5 has a head 16 at the tip of the neck 15, and since the head 16 is thicker and wider than the neck 15, the lead end of the winding is formed into the T-shaped protrusion. When winding, the lead terminal can be twisted to a certain thickness and length as long as the head 16 is not exceeded. Since the T-shaped projecting portion 5 projects in the same plane as and parallel to the bottom surface of the lower collar 4, it can be directly soldered to the board conductor 13 during surface mounting. The T-shaped protrusion 5 not only facilitates connection, but also allows reliable connection to the surface of the substrate and surface mounting. Further, since the head 16 of the T-shaped protrusion 5 projects laterally, the lead terminal can be wound up to the head. Therefore, the lead end of the entangled winding does not loosen and come off or fall out unless it is wound over the head.

FIG. 2 is a perspective view showing the structure of the surface mounting coil transformer of the present invention. The surface-mounting coil transformer has a coil bobbin shown in FIG. 1 in which a winding 6 is applied to a cylindrical winding core 1, and a lead end 7 of the coil bobbin has a neck portion 15 and a head portion 16 of the T-shaped protruding portion 5. A tangled portion 8 is formed by entanglement. In addition, after pre-soldering the barbed portion 8, the E-type magnetic core 9 and the I-type magnetic core 10 are assembled in the core insertion hole 2 (see FIG. 1) of the bobbin, and the magnetic core is fixed with the magnetic core fixing fitting 11. To form a surface mount coil transformer.

FIG. 3 is a side view showing a main part when the surface mounting coil transformer of the present invention shown in FIG. 2 is mounted on a substrate. The surface-mounting coil transformer is provided with a barb portion 8 formed by a lead end 7 of a coiled wire wound on a T-shaped protrusion 5.
Neck part 15 that protrudes in parallel with the bottom surface of the lower collar 4 and
The circuit conductor 13 on the substrate 12 has a structure in which the barb terminal is formed by the T-shaped protrusion 5 having the head 16 and the head 16.
The entangled portion 8 is directly joined with solder to form a solder joint.

[Effect of device]

As described above, according to the present invention, the coil bobbin is provided integrally with the lower collar, and the surface mounting terminal of the T-shaped protrusion protruding in parallel with the bottom surface of the lower collar is provided. , The winding of the barbed part does not come apart or fall out, and the T-shaped protrusion that barks the lead end is directly used as the barbed terminal for surface mounting of the board, so that the circuit and winding of the mounting board Since the electrical connection between the terminals is reliable and the metal bobbin terminal is not planted in the coil bobbin, the manufacturing cost is lower and the barb terminal with the T-shaped protrusion is formed, which has no electrical continuity failure compared to the conventional one. It is now possible to supply the surface mounting coil and transformer.

[Brief description of drawings]

FIG. 1 is a perspective view showing the structure of a coil bobbin for surface mounting coil / transformer of the present invention. FIG. 2 is a perspective view showing the structure of the surface mounting coil transformer of the present invention. FIG. 3 is a side view showing a main part when the surface mounting coil transformer of the present invention is mounted on a substrate. 1 ... Cylindrical winding core. 2 ... Core insertion hole. 3 ... Upper Tsuba. Four
…… Lower Tsuba. 5: T-shaped protrusion. 6 ... Winding. 7 ...
Lead terminal. 8: The burial part. 9 ... E-type magnetic core. Ten
... I type magnetic core. 11 …… (Core) fixing bracket. 12 ... substrate. 13 ... Circuit conductor. 14 ... Solder connection part. 15 ... neck,
16 ... head.

 ─────────────────────────────────────────────────── ───Continued from the front page (56) References Microfilm (JP, U) of the contents and drawings attached to the application for Japanese Patent Application No. 60-192165 (No. 62-101210). Micro film (JP, U) of the contents of the specification and drawings attached to the application for Japanese Utility Model Application No. 53-176023 (No. 55-94025)

Claims (1)

[Scope of utility model registration request] 1. A vertical coil bobbin in which a tubular core made of an insulating material is provided with flanges projecting outward at both upper and lower ends of the tubular core, and the cylindrical core is wound to form a magnetic core in the coil bobbin. In a surface-mounting coil transformer in which the magnetic core is fixed with metal fittings or an adhesive tape, a T-shaped protruding portion integrally projecting on the end face of the lower collar of the vertical coil bobbin in the same plane as the bottom face of the collar and in parallel therewith. A coil transformer for surface mounting, characterized in that a terminal for surface mounting of the board is formed by soldering the winding lead end to the T-shaped protrusion.