JPH0550706U - Surface mount inductor - Google Patents

Abstract

(57) [Abstract] [Purpose] To obtain a surface-mount inductor that allows a winding end to be brought into contact with a terminal without being entangled with the terminal and is easy to solder. [Structure] A resin substrate 2 having a trapezoidal convex portion 9 at the center of one main surface 7 and terminals 11 formed continuously on the main surface 7 through the end face to the other main surface. And a ferrite core 1 having flanges 4 ₁ and 4 ₂ at both ends of the columnar winding core 3, and the projection 8 of the substrate 2 is fitted with the recess 6 of the ferrite core 1 to form the projection 9 and the projection of the core 1. The end of the winding wound around the core 3 of the core 1 is fixed to the flange 4 _{1 of the} core _1.
When inserted in the gap between the main surface 7 of the substrate 2 and the
It is sandwiched between the flange 4 ₁ and the substrate 2 while being in contact with the terminal 11, and soldered to the terminal 11.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a surface mount inductor.

[0002]

[Prior Art]

 As a conventional surface mount type inductor, as shown in FIG. 9A, a ferrite core d having flanges c and c provided at both ends of a columnar winding core b is fixed on a substrate a. As shown in FIG. 9 (b), a winding (partly shown) e is wound and its winding terminal f is provided with a plate-like lead terminal g projecting from both ends of the board a. It is known that it is soldered at the base of the.

[0003]

[Problems to be solved by the device]

 The above-described surface-mount inductor requires a lot of work because the winding end f is entangled with the root of the plate-shaped lead terminal g, and when the wire diameter of the conductor becomes thicker than that of the lead terminal g, When the wire terminal f is entwined with the lead terminal g, as shown in FIG. 9B, the lead terminal g is bent, and the space between the pair of lead terminals g is widened or narrowed to lead. There is a problem in that the terminal pitch varies and may not match the pitch of the conductive pads on the wiring board. An object of the present invention is to provide a surface mount inductor that solves the above-mentioned conventional problems.

[0004]

[Means for Solving the Problems]

 According to a first aspect of the present invention, there is provided a substrate having a trapezoidal convex portion at a central portion of one main surface, and terminals formed continuously from the one main surface to the end surface on the other main surface. And an inductor body in which a winding is wound around a core having flanges at both ends of a columnar winding core, and one flange of the core is fixed to an upper surface of a convex portion of one main surface of the substrate, The invention according to claim 2, wherein the winding end contacting the terminal is sandwiched between one main surface of the base plate and one flange of the core, and the winding end is soldered to the terminal. In the invention according to Item 1, a convex portion having substantially the same diameter as the convex portion of the substrate is formed on the outer surface of one flange of the core, and one of the convex portion and the convex portion of the substrate is used for positioning. The invention according to claim 3, wherein the projection is formed on the other side, and a recess for positioning which fits on the projection is formed. In the invention as described above, a conductor coating is continuously formed on the outer surface of one flange of the core and the side wall of the convex portion formed on the outer surface of the one flange of the substrate and one flange of the core. It is a surface-mount type inductor, which is formed by sandwiching a winding end that is in contact with the conductor coating and the terminal and soldering the winding end to the terminal and the conductor coating.

[0005]

[Action]

 The invention according to any one of claims 1 to 3, wherein a trapezoidal convex portion is provided at a central portion of one main surface, and terminals are continuously formed from the one main surface to the end surface through the other end surface. One of the flanges of the core is fixed to the above-mentioned convex portion of the board, and the end of the winding wound around the core is inserted between the board and the flange to contact the terminal with the board. Hold it with the flange. Therefore, the winding ends are in a state of being in contact with the terminals without being entangled, which facilitates soldering.

According to the third aspect of the present invention, the winding end is soldered to the conductor coating formed continuously on the outer surface of the one flange of the core and the side wall of the convex portion formed on the flange and the terminal. Since it is attached, the winding terminal is firmly soldered to the terminal, and the soldering state can be easily visually checked.

[0007]

【Example】

An embodiment of the present invention will be described below with reference to the drawings. 1 to 3 show an embodiment of the present invention. In the figure, 1 is a magnetic core, for example, a ferrite core, and 2 is a resin substrate. The magnetic core 1 has flanges 4 ₁ and 4 ₂ at both ends of the columnar winding core 3, and a trapezoidal circular convex portion 5 is formed in the central portion of _one of the flanges 4 _{1 and} the convex portion 5 has A rectangular recess 6 for positioning is formed. A rectangular protrusion 8 for positioning is formed on the upper surface of the central portion of one main surface 7 of the substrate 2, and a circular convex portion 9 having substantially the same diameter as the convex portion 5 of the flange 4 ₁ is formed. Further, a pair of terminals 11 is formed continuously from the edge of the convex portion 9 through the end face to the other main surface 10 by, for example, plating. The recesses 6 of the magnetic core 1 are fitted into the protrusions 8 of the substrate 2 to bond the convex portions 9 of the substrate 2 and the convex portions 5 of the magnetic core 1 to each other, and the conductor wire is wound around the winding core portion 3 of the magnetic core 1. the winding 12 is wound around Te, the winding terminal 13 via the notch 14 of the peripheral edge of the flange 4 ₁ inserted into the gap between the substrate 2 and the flange 4 _1. This gap has substantially the same length as the diameter of the wire, the winding terminal 13 is sandwiched in contact with the flange 4 ₁ and the terminal 11 to the substrate 2. This connecting portion is soldered 15 by immersing it in molten solder, for example.

_On the outer surface of the flange 4 ₁ of the magnetic core 1 of the above embodiment, as shown in FIGS. 4 and 5, a conductor coating 17 may be formed on the side wall 16 of the convex portion 5 by plating, for example. If formed in this way, the winding terminal 13 sandwiched between the flange 4 ₁ and the substrate 2 can be soldered 15 to the terminal 11 and the conductor coating 17, and the connection to the terminal 11 can be made even stronger. In addition, the soldering state can be easily viewed from the outside.

When the core fixing guides 18 projecting from the four corners of the substrate 2 are provided on the substrate 2 of the above embodiment as shown in FIG. 6, as shown in FIG. When the magnetic core 1A or the sleeve type magnetic core 1B is installed on the substrate 2 as shown in FIG. 8, the magnetic core 1A or 1B can be positioned at a predetermined position on the substrate 2.

In the embodiments shown in FIGS. 1 to 3, the convex portion 5 is formed on the outer surface of the _one flange 41 of the magnetic core 1. However, the convex portion 9 of the substrate 2 is formed by the height of the convex portion 5. If the height is increased, the convex portion 5 may not be formed. In this case, in order to position the magnetic core ₁ , a protrusion is provided on the flange 4 ₁ of the magnetic core 1 and a recess is provided on the substrate 2. Is desirable.

[0011]

Since the invention of claims 1 to 3 is configured as described above, it is suitable for surface mounting in which the winding terminal and the terminal can be easily connected and the pitch of the pair of terminals is always constant. There is an effect that an inductor is obtained, and the invention of claim 3 further has an effect that the soldering of the terminal and the winding terminal becomes strong and the soldered state can be easily visually checked from the outside.

[Brief description of drawings]

FIG. 1 is an exploded view of an embodiment of the present invention before winding a winding.

FIG. 2 is a perspective view of the above embodiment with some windings omitted.

FIG. 3 is a cross-sectional view of a joint portion between the substrate and the magnetic core of the above embodiment.

FIG. 4 is a bottom view of a magnetic core according to another embodiment.

FIG. 5 is a sectional view of a joint portion between a substrate and a magnetic core according to another embodiment.

FIG. 6 is a perspective view of a modified example of the substrate of the present invention.

FIG. 7 is a perspective view of an embodiment of the present invention using the substrate shown in FIG.

FIG. 8 is a perspective view of another embodiment of the present invention using the substrate shown in FIG.

9A and 9B are perspective views of a conventional inductor before winding a winding and when winding a winding and winding a winding terminal around a lead terminal.

[Explanation of symbols]

 1 Magnetic Core 2 Resin Substrate 5 Projection 9 Projection 11 Terminal 12 Winding 13 Winding Terminal 15 Soldering 16 Sidewall of Projection 5 17 Conductor Film

Claims (3)

[Scope of utility model registration request] 1. A substrate having a trapezoidal convex portion at the center of one main surface, and a terminal on which terminals are continuously formed from the one main surface to the end surface to the other main surface. It comprises an inductor body in which a winding is wound around a core having flanges at both ends of a winding core, and one flange of the core is fixed to an upper surface of a convex portion of one main surface of the substrate, A surface-mounted inductor formed by sandwiching a winding end contacting a terminal between the main surface of the core and one of the flanges of the core, and soldering the winding end to the terminal. 2. A protrusion having substantially the same diameter as that of the protrusion of the substrate is formed on the outer surface of one flange of the core, and a protrusion for positioning is provided on one of the protrusion and the protrusion of the substrate. The surface mount inductor according to claim 1, wherein a recess for positioning that fits into the protrusion is formed on the other side. 3. A conductor coating is continuously formed on an outer surface of one flange of the core and a side wall of a convex portion formed on the outer surface of the one flange of the substrate and one flange of the core. Hold the winding end contacting the conductor coating and the terminal,
The surface mount inductor according to claim 2, wherein the winding terminal is soldered to the terminal and the conductor coating.