JPH0217449Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an inductance element used as a linearity correction coil or the like.

[Technical background of the invention and its problems] This type of inductance element is constructed by winding a coil around a magnetic core and applying a magnetic bias to this coil using a permanent magnet, and the inductance relative to the current value changes depending on the current polarity of the coil. This allows the current waveform to be corrected.

In the conventional general case, a permanent magnet is adhesively fixed to one end face of a magnetic core around which a coil is wound, and a terminal plate is adhesively fixed to the other end face, and holes are provided at predetermined intervals in this terminal plate. A lead terminal member was inserted and bonded to the lead terminal member, and the end of the coil was connected to the lead terminal member. However, in the case of this type of structure, there are many parts because a terminal board is used, and the lead terminal member inserted and bonded to the terminal board may be insufficiently bonded or may easily break down if it is slightly pulled. There was a problem that the lines were missing.

Further, as a structure that does not use a terminal plate, for example, the structure described in the Publication of Utility Model Publication No. 120125/1983 has been previously proposed. However, in the case shown here, the end of the coil is used as it is as a lead terminal member, so when the wire diameter of the coil is small, that is, when it is necessary to increase the number of turns or downsize, etc. The bending rigidity of the wire is low, the lead terminal member is easy to bend and cannot be inserted into the hole of the printed circuit board, and even if it is placed on the printed circuit board, the lead terminal member is easy to break due to vibration etc. There were various problems such as the inability to stably and independently hold the element itself.

[Purpose of the invention] The present invention was made in view of the above circumstances, and its purpose is to eliminate the need to necessarily use a terminal board by providing a lead terminal member on the permanent magnet, and to eliminate the need to use a terminal board. To provide an inductance element that can prevent a terminal member from being easily removed from a permanent magnet, can be easily placed on a printed circuit board, and can also contribute to preventing disconnection of a lead terminal member. It is.

[Summary of the invention] In order to achieve the above object, the present invention provides an inductance element in which a permanent magnet is provided on the end face of a magnetic core around which a coil is wound, and an end of the coil is connected to a lead terminal member. The lead terminal member has a shaft portion and a head portion formed by expanding the longitudinal end portion of the shaft portion outwardly from the shaft center through plastic deformation, and includes a permanent magnet facing the magnetic core. The permanent magnet is provided with a through hole through which the shaft is passed from one opposing end surface to the other end surface, and a recess into which the head formed at the end of the shaft inserted through the through hole is inserted. The inductance element is constructed by arranging the head recessed in the recess to face the end face of the magnetic core, and adhesively fixing the end face of the magnetic core to a permanent magnet.

[Embodiment of the invention] Next, an embodiment of the invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing an inductance element which is an embodiment of the present invention. In the figure, the reference numeral 1 is a magnetic core made of ferrite or the like and having an appropriate shape such as a drum shape, and its intermediate stepped portion 1A.
A coil 2 is wound around the coil 2, and its terminal 2A is pulled out.

Also, what is indicated by 7 in FIG. 1 is a lead terminal member, which includes a shaft portion 7A and a head portion 7B formed by expanding the longitudinal end portion of the shaft portion 7A outwardly from the shaft center through plastic deformation. It is composed of.

For example, the head 7B is formed into an elliptical shape by expanding the longitudinal end portion of the shaft portion 7A outward from the shaft center by pressing or forging, as shown in FIG. 2a.

Note that the shape of the head 7B is not limited to that shown in FIG. 2a, but can also be made into a rectangular flat plate shape as shown in FIG. 2b. When forming into a flat plate, it can also be formed into other polygonal shapes such as a triangle, or semicircular shapes. Further, as shown in FIG. 2c, a rectangular flat plate can be formed in an upright state with respect to the shaft portion 7A. Even when it is formed in an upright state, it can be formed into a triangular shape as shown in FIG. 2d, or other polygonal shapes or semicircular shapes. Furthermore, although not shown, the shape of the head can be formed into an elliptical sphere, a semi-elliptical sphere, or a truncated pyramid.

Further, in FIG. 1, the reference numeral 3 indicates a permanent magnet having a shape substantially similar to the end surface of the magnetic core 1. This permanent magnet is provided with a through hole 4 through which the shaft portion 7A of the lead terminal member 7 is passed from the opposite end surface 3A facing the magnetic core 1 to the other end surface 3B, and the shaft portion inserted into the through hole 4. A recess 5 into which the head 7B formed at the end of 7A is inserted is provided. Since the head 7B is inserted into the recess 5, the shape of the recess 5 follows the outer shape of the head 7B. For example, the shape of the recess 5 adapted to the elliptical head 7B shown in FIG. 2a is an ellipse as shown in the cross-sectional view of FIG. The shape shown in the sectional view of FIG. 3b for the part 7B, and the shape shown in FIG. 3c for the rectangular head 7B in the upright state shown in FIG.
The shape shown in the sectional view of FIG. 2, and the shape shown in FIG. 3d for the inverted triangular head 7B in the upright state shown in FIG. 2d.

Note that FIG. 4 shows a plane facing the opposite end surface 3A of the permanent magnet.

Then, the shaft portion 7A of the lead terminal member 7 is inserted into the through hole 4 of the permanent magnet 3, and the head 7B is recessed into the recess 5, and the recessed head 7B is opposed to the end surface of the magnetic core 1. The end face of the magnetic core 1 and the permanent magnet 3 are adhesively fixed with an adhesive 8. The terminal end 2 of the coil 2 is overlapped or tied to the exposed portion of the shaft portion 7a of the lead terminal member 7 fixed in this way, and electrically connected thereto by means such as brazing. Connections have been fixed.

In the inductance element constructed in this manner, since the lead terminal member 7 is provided on the permanent magnet 3, a conventional terminal plate is not required, and the number of parts and size can be reduced. Further, since the head 7B of the lead terminal member 7 is sandwiched and adhesively fixed to the end face of the magnetic core 1 and the opposing end face 3 of the permanent magnet 3 via the recess 5, a tensile force is applied in the longitudinal direction of the lead terminal member. It can be prevented from easily coming off from the permanent magnet 3 even if the magnet is acted on, and it can also contribute to preventing disconnection of the terminal of the lead terminal and the core-wound coil. Furthermore, since the lead terminal 7 is not formed by a part of the terminal of the core-wound coil 2, the element itself can be stably held independently regardless of the wire diameter of the core-wound coil 1, and it can be attached to a printed circuit board. It is also easy to install.

Furthermore, since the head 7B of the lead terminal member 7 is regulated within the recess 5 due to its shape, it is also possible to prevent the lead terminal member 7 from rotating within the permanent magnet 3. It can be fixed even more firmly to the permanent magnet 3, and the coil terminal 2
It is also possible to more reliably prevent the disconnection accident of A.

Next, another embodiment of the present invention will be described. FIG. 5 is a sectional view showing another embodiment of the present invention,
FIG. 6 is a plan view of a permanent magnet used in the same embodiment. The same members as in the above embodiment are given the same reference numerals, and detailed explanation thereof will be omitted. The different structure is that the recess 5 into which the head 7B is inserted is provided on the permanent magnet 3, and the recess 5 is configured such that a part of the recess 5 passes through to the side end surface of the permanent magnet. From this recess 5, the lead terminal member 7
A part of the head 7B of the coil 2 is exposed to the side, and the terminal 2A of the coil 2 is overlapped or tied to this exposed part, and the terminal 2A of the coil 2 is electrically connected and fixed thereon by means such as brazing. has been done. Even if the inductance element is configured in this way, the same effects as in the above embodiment can be obtained.

It goes without saying that the above-mentioned embodiments are merely examples, and that various modifications can be made within the scope of the gist of the present invention.

[Effects of the invention] As detailed above, in the inductance element of the present invention, by providing the lead terminal member on the permanent magnet, it is not necessarily necessary to use a terminal plate, and this lead terminal member can be removed from the permanent magnet. This has excellent effects such as being able to prevent the lead terminal member from coming off, making it easier to place it on the printed circuit board, and contributing to preventing disconnection of the lead terminal member.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an inductance element which is an embodiment of the present invention, FIGS. 2a to 2d are perspective views showing lead terminal members, and FIGS. 4 is a plan view of the opposite end face of the permanent magnet, FIG. 5 is a sectional view showing another embodiment of the present invention, and FIG. 6 is a plan view of the permanent magnet used in the same embodiment. be. 1...Magnetic core, 2...Coil, 3...Permanent magnet,
3A...Opposing end surface, 3B...Other end surface, 4...Through hole, 5...Recess, 7...Lead terminal member, 7A...
...Shaft, 7B...Head.

Claims (1)

[Scope of utility model registration request] In an inductance element in which a permanent magnet is provided on the end face of a magnetic core around which a coil is wound, and an end of the coil is connected to a lead terminal member, the lead terminal member has a shaft portion and a longitudinal end of the shaft portion. a through-hole having a head portion formed by expanding outward from the shaft center through plastic deformation, and through which the shaft portion passes from the opposite end surface of the permanent magnet facing the magnetic core to the other end surface; The permanent magnet is provided with a recess into which the head formed at the end of the shaft inserted into the through hole is inserted, and the head inserted into the recess is opposed to the end surface of the magnetic core. An inductance element characterized in that the end face of this magnetic core and a permanent magnet are adhesively fixed.