JPH01207910A - Variable inductor - Google Patents

Abstract

PURPOSE:To eliminate traveling distance of core and to enable a thin-type variable inductor to be obtained by providing a gap to a ring-type core wound by coil and by placing a column type core with a part which is different in magnetic permeability at that gap. CONSTITUTION:A gap 18 with arbitrary width is provided at a ring core 19, a column-type core 15 with parts of higher and lower magnetic permeability is placed within the gap 18, and the column-type core 15 is rotated horizontally. A coil 21 is wound around this ring-type core 19, a leading wire 22 at both edges of this coil 21 is wound around a terminal 13, and it is wired by soldering, etc. It eliminates traveling distance of core and allows thinner variable inductor than conventional one to be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a variable inductor that is used in various electronic devices and has a terminal bone integrally molded bobbin with a multilayer winding frame structure.

Conventional technology In recent years, due to the miniaturization of electronic devices, the shape of electronic components has also become smaller.
Thin types have come to be used. Part 2 of the configuration of a conventional variable inductor will be explained below.

FIG. 4 is an exploded perspective view showing the configuration of a conventional variable inductor, 5 is a bobbin portion of a terminal bone integrally molded bobbin 1, 6 is a terminal plate in which a pin terminal 7 is implanted, 1.9 is a terminal bone integrally molded bobbin 1 and a metal shield case 11
3 is a screw core made of ferrite which is inserted into the bobbin portion 5 of the terminal bone integrally molded bobbin 1 from the vertical direction.

The operation of the variable inductor configured as above will be described below.

First, the coil 2 is wound around the bobbin portion 6 provided at the center of the terminal plate 6 of the terminal bone integrally molded bobbin, and wired to the pin terminal 7. Next, the molded body 9 is vertically placed over the terminal bone integrally molded bobbin 1, and the projection 8 provided on the terminal plate 6 and the window 1o provided at the lower part of the molded body 9 are engaged. Furthermore, a metal shield case 11 is placed over the molded body 9, and the inner space raised part 12 provided at the lower part of the shield case 11 is engaged with the protrusion part 8 provided on the terminal board 6. and fix the terminal plate 6.

Then, a ferrite screw core 3 is inserted into the hollow portion 4 of the bobbin portion 5, and the screw core 3 is moved up and down to obtain a change in inductance.

Problems to be Solved by the Invention However, the conventional configuration described above has the problem that a distance of movement is required as the screw core 3 moves up and down, and the shape of the variable inductor inevitably becomes high.

The present invention solves the above-mentioned conventional problems, and aims to provide a variable inductor that eliminates the moving distance of the core, allows a thin shape, and allows for change in inductance.

Means for Solving the Problem In order to solve this problem, the variable inductor of the present invention has the following features:
A ring core is provided with a gap having an arbitrary width, a cylindrical core having a high magnetic permeability portion and a low magnetic permeability portion is placed within the gap, and the cylindrical core is rotated in the horizontal direction.

Operation With this configuration, by horizontally rotating the cylindrical core, which is the mechanism for varying the inductance, the moving distance of the core can be eliminated, and a variable inductor that is thinner than conventional variable inductors can be realized.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view showing the external appearance of the variable inductor of the present invention in a state in which winding is finished. FIG. 2 shows the configuration of the variable inductor of the present invention, and FIG. 3 is a cross-sectional view when the terminal plate and the cylindrical core are combined.

In FIG. 2, a high magnetic permeability portion 152L and a low magnetic permeability portion 15b are provided on the upper surface of the terminal plate 14 on which the terminal 13 is insert-molded in a cross section parallel to the terminal plate 14. , a cylindrical protrusion 16 having an arbitrary size than the terminal plate 14 and a groove 17 having an arbitrary depth of 5A are provided around the protrusion 16, and the cylindrical core 15 is placed therein; Fit so that horizontal rotation is possible. Then, in the ring-shaped core 19 having the gap 18 with an arbitrary width, the upper surface of the terminal plate 14 is located at a position where the side surface 181L of the gap 18 does not come into contact with the side surface of the cylindrical core 16 and an even and slight gap 2o is provided. A ring-shaped core 19 is placed in the section. A coil 21 is wound around this ring-shaped core 19, and lead wires 22 at both ends of this coil 21 are wound around terminals 13 and wired by soldering or the like.

As described above, according to this embodiment, the cylindrical core 15 is rotated horizontally relative to the terminal plate 14, that is, the moving distance of the cylindrical core 16 is eliminated, and the high permeability portion 162L The inductance is maximum when the ring-shaped core 1 is located inside the ring-shaped core 1.
The inductance can be minimized when located within the outer circumferential circle of 9.

Note that the cylindrical core 15 is provided with a high magnetic permeability portion 161L and a low magnetic permeability portion 16b; for example, ferrite or the like is used for the high magnetic permeability portion 151L, and metal is used for the low magnetic permeability portion 15b. In terms of shape, it may be cap-like or simply cylindrical.

Further, as the terminal board 14 having the terminal 13 to which the coil 21 is wired, there can be used a surface mounting type terminal board with insert molded plate terminals and a terminal board with conventional pin terminals implanted therein.

Effects of the Invention As described above, the present invention provides a gap in a ring-shaped core around which a coil is wound, and rotatably arranges a cylindrical core having portions with different magnetic permeability in the gap, thereby eliminating the need for a conventional screw core. Instead of obtaining inductance changes by vertical movement, inductance can be obtained by horizontal rotation of the cylindrical core, and the effect of eliminating the movement distance of the cylindrical core can be achieved, making it possible to realize a thin variable inductor. It is.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a variable inductor vane lid according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the main parts showing the configuration of the variable inductor, and FIG. 3 is a sectional view of the variable inductance mechanism. FIG. 4 is a perspective view showing the configuration of a conventional variable inductor. 13...Terminal, 14...Terminal board, 161L.
... High magnetic permeability part, 15b ... Low magnetic permeability part, 16... Cylindrical core, 16... Cylindrical protrusion, 17... Groove, 18... Gap , 19...Ring-shaped core, 20...Gap, 21. Coil. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4

Claims (1)

[Claims] A ring-shaped core with a coil wound thereon is placed on the upper surface of a terminal board having a terminal that can be wired, with a gap provided in a part, and a rotation axis is set perpendicular to the terminal board within the gap of the ring-shaped core. , a variable inductor that has a rotatably arranged cylindrical core with a high permeability part and a low permeability part in a cross section perpendicular to the rotation axis.