JPH0541113U - coil - Google Patents

Abstract

(57) [Summary] [Purpose] By changing the magnetic permeability by moving the position of the core inserted in the coil, the inductance can be changed even after mounting on the board. [Structure] A winding wire 2 wound in a tubular shape, a core agent 4 movable along the center line of the tubular shape, and a laminated piezoelectric actuator 5 for moving the core agent 4. The inductance of the coil can be changed by changing the relative positional relationship with the actuator 4.
The winding wire 2 may be wound around a fixed cylindrical core material 3 into which a movable movement core material 4 is inserted, or may be hollow.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a coil composed of a wound winding and a core material, and particularly to a coil whose inductance can be changed.

[0002]

[Prior Art]

 Heretofore, it has been widely used, for example, by winding a coated wire around a core material and fixing a coil whose inductance does not change to the base plate. FIG. 3 shows an example thereof, in which the coated conductor wire 2 is wound around the core material 13 and fixed to the base 1 by the adhesive 8 for fixing. Reference numeral 7 is a conductor connected to the end of the lead wire.

[0003]

[Problems to be solved by the device]

 In the above-mentioned conventional coil, it is extremely possible to make it according to the desired inductance, depending on the spacing of the coated wire wound around the core material, the amount of adhesive used for fixing, and the length of the lead part of the wire when mounting the board. It had the drawback of being difficult.

An object of the present invention is to solve the above drawbacks and to provide a coil that can be accurately matched to a desired inductance in a mounted state.

[0005]

[Means for Solving the Problems]

 To achieve the above-mentioned object, the coil of the present invention drives at least a winding 2 wound in a tubular shape, a core material 4 movable along the central line of the tubular shape, and a core material 4. The laminated piezoelectric actuator 5 is provided, and the coil inductance can be changed by changing the relative positional relationship between the winding 2 and the laminated piezoelectric actuator 5.

[0006]

【Example】

 Next, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is an explanatory diagram showing the configuration of an embodiment of the present proposal. In the figure, 1 is a base on which a coil is mounted, 2 is a coil winding (coated wire), 3 is a cylindrical core material around which the winding 2 is wound, 4 is movable and is inserted into the hollow portion of the core material 3. A core material, 5 is a laminated piezoelectric actuator, 6 is a stabilizing power source that is a driving source of the laminated piezoelectric actuator 5, 7 is a conductor provided on the back surface of the base, and 8 is a fixing for fixing the coil to the base 1. It is an agent.

In FIG. 1, a tubular core material 3 is fixed to a base 1 together with a coil winding 2 by an adhesive 8. The core material 4 is rod-shaped and has one end attached to the laminated piezoelectric actuator 5. Further, a part thereof is inserted into the hollow portion of the tubular core material 3.

Since the core material 4 can freely move in the cylindrical core material 3, by applying an appropriate voltage from the stabilizing power source 6 to the laminated piezoelectric actuator 5, the core material 4 can be freely moved to the left or right in the figure. Can be placed in the position. In this way, if the mutual relational positions of the two core materials 3 and 4 are changed, the magnetic permeability of the core material changes, so by selecting the voltage to be applied to the laminated piezoelectric actuator 5, the coil inductance is independent. Can be changed. Therefore, the inductance of the coil can be accurately adjusted to any value after mounting. Furthermore, this embodiment can be used for fine adjustment of the characteristics of the device including the external circuit.

Although the winding is wound around the hollow cylindrical core material in the embodiment of FIG. 1, the core material 3 is a prism or other tubular shape, and the core material 4 inserted into the hollow portion is the core material 4 described above. It may be adapted to the hollow portion of the cylinder. Alternatively, the coil may be an air core, and a movable core material may be inserted into the air core. Further, various modifications can be considered, such as dividing the core material to be inserted into the air core into two parts, fixing one and making the other movable so that the distance between the two can be varied.

[0010]

[Effect of the device]

 As described above, according to the present invention, by inserting the core material into the hollow part of the winding wire wound in a cylindrical shape and changing the position of the core material with respect to the coil, the inductance of the coil can be improved even after mounting. There is an effect that can be freely adjusted. Further, by winding the winding wire around a cylindrical core material and inserting the core material driven by the laminated piezoelectric actuator into the hollow portion, a coil that is small and easy to adjust can be obtained.

[Brief description of drawings]

FIG. 1 is an explanatory view (front view) showing the structure of an embodiment of the present invention.

2 is a right side view of the embodiment of FIG. 1. FIG.

FIG. 3 is an explanatory view (front view) showing the structure of an example of a conventional coil.

[Explanation of symbols]

 1 Base 2 Winding 3 Cylindrical Core Material 4 Movable Core Material 5 Multilayer Piezoelectric Actuator 6 Stabilized Power Supply 7 Conductor 8 Adhesive

Claims (2)

[Scope of utility model registration request] 1. A winding wire wound at least in a cylindrical shape, a core material movable along the center line of the cylindrical shape, and a laminated piezoelectric actuator for driving the core material. A coil characterized in that the inductance of the coil can be changed by changing the relative positional relationship with the laminated piezoelectric actuator. 2. The winding is wound around a fixed core material having a hollow inside, and the core material driven by the laminated piezoelectric actuator is inserted into the hollow portion of the fixed core material. The laminated piezoelectric actuator described.