JPH0778720A - Surface packaged inductor - Google Patents

Abstract

PURPOSE:To obtain the title surface packaged inductor fit for automatic installation so that the lead terminal ends may be hardly slipped from the conductive parts of a circuit substrate when the leading-out end of a winding wound up around a drum core is fixed to the lead terminal without deformation to be packaged on a circuit substrate. CONSTITUTION:Recessions 4, 4 are formed on outer sides of both end flanges 3, 3 of a drum type core 1 so that the basic end parts 8, 8 of lead terminals, 2, 2 may be inserted into these recessions 4, 4 to be fixed. On the other hand, the basic end parts 8, 8 of lead terminals 2, 2 are provided with auxiliary terminals 9, 9 extending from this surface so that leading-out ends 12, 12 of a winding 7 may be tied up with the auxiliary terminals 9, 9 to be soldered later.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a surface mount inductor.

[0002]

2. Description of the Related Art As a conventional inductor, surface mounting in which lead terminals are fixed to both flanges of a drum type core, a winding is wound around the core, and the lead end is bent and fixed to a plate-shaped lead terminal. Type inductors are known.

[0003]

In the above-mentioned conventional inductor, when the lead end of the winding is bent and fixed to the lead terminal, the plate-shaped lead terminal is easily bent. There is a problem that a position shift easily occurs from the surface.

It is an object of the present invention to solve the above problems of the conventional surface mount type inductor.

[0005]

In order to achieve the above object, the present invention provides a drum type core having recesses for inserting and fixing lead terminals on the outer surfaces of the collars on both sides, respectively.
The base end portion inserted into and fixed to the recess has an auxiliary terminal portion extending therefrom, and the terminal portion at the other end extending from the base end portion is bent along the mounting surface of the circuit board and at least the terminal portion. Is composed of a pair of flattened lead terminals, and a winding wire wound around the drum core and having its lead-out end fixed to the auxiliary terminal portion.

[0006]

The lead-out end of the winding is fixed by, for example, being twisted and fixed to the auxiliary terminal portion projecting from the base end portion of the lead terminal inserted and fixed in the concave portion of the outer surface of the flange of the drum core.
The lead terminals are not deformed when they are fixed. Therefore, when the inductor is mounted on the mounting surface of the circuit board, the terminal portion of the lead terminal is unlikely to be displaced from the conductive surface of the circuit board.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

In the drawings, 1 is a drum type core and 2 is a lead terminal.

The drum type core 1 has collars 3 and 3 at both ends,
A concave portion 4 is formed on the outer side surface of the collar 3 and a groove 5 is formed on the peripheral end surface thereof, and a winding wire 7 is wound around a winding core portion 6.

The lead terminal 2 has an auxiliary terminal portion 9 extending from the surface at the base end portion 8 at one end, and when the inductor is arranged on the circuit board, the terminal portion 10 at the other end is the mounting surface of the circuit board. The intermediate part is bent at three places so as to follow. Although the lead terminal is formed of a plate material, a wire material may be used to bend the base end portion of the lead terminal portion to form an auxiliary terminal portion, and the other end portion of the terminal portion 10 may be crushed to form a flat shape.

The base ends 8 and 8 of the lead terminals 2 and 2 are respectively inserted into the recesses 4 and 4 of the collars 3 and 3 at both ends of the drum-type core 1 and fixed by an adhesive agent 11. The lead-out end 12 of the winding wire 7 wound around the winding core portion 6 is entwined through the groove 5 and soldered and fixed to the auxiliary terminal portion 9 extending from the upper surface of 11.

[0012]

Since the present invention has the above-mentioned structure, the lead terminal is not deformed when the lead-out end of the winding is fixed to the lead terminal. Therefore, when the inductor is mounted on the circuit board, the lead is not deformed. The terminal is less likely to be displaced from the conductive portion of the circuit board, which is particularly advantageous when automatically mounting.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view of the above embodiment.

FIG. 3 is a side view of the above embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Drum type core 2 Lead terminal 3 Tsuba 4 Recess 7 Winding 8 Base end 9 Auxiliary terminal 10 Terminal 11 Adhesive

Claims (1)

[Claims] 1. A drum core having recesses for inserting and fixing lead terminals on the outer surfaces of the collars on both sides, and an auxiliary terminal portion extending from the base end portion inserted and fixed in the recesses. A pair of lead terminals extending from the base end portion and having a terminal portion at the other end bent along the mounting surface of the circuit board and at least the terminal portion being flat, and wound around the drum core. A surface-mount type inductor, wherein a lead-out end of the winding is fixed to the auxiliary terminal portion.