Line filter

Details Line filter Line filter

1996-06-26

1999-02-09

Spyrou, Cassandra C.

Inductor devices

With outer casing or housing

336197, 336196, 336198, H01F 2702, H01F 2730, H01F 2726

Patent

active

058700110

DESCRIPTION:

BRIEF SUMMARY
FIELD OF TECHNOLOGY

The present invention relates to a line filter for use in a power supply circuit for various kinds of electronic equipment and the like.


BACKGROUND TECHNOLOGIES

As illustrated In FIG. 29 to FIG. 31, a prior art line filter has a structure wherein a winding bobbin 53 prepared by molding a resin material into two-piece construction is assembled on one of the magnetic legs of a square shaped closed magnetic circuit core 52 made of a high permeability magnetic material such as ferrite and the like and a pair of windings 54 are wound around the wire winding bobbin 53 by rotating the winding bobbin 53 by means of a gear formed on the end surface or on the central part of the winding bobbin 53.
Next, metal terminals 55 are placed in insertion holes arranged on flanges of the winding bobbin 53 and the windings' start and end lead wires are wrapped around and securely connected by soldering to the metal terminals 55. Further, a core cover 56 is installed so as to cover the core 52 and fixed on to the core 52 by having its opening's surfaces inserted in slots 57 formed on the outer surfaces of the flanges situated on both ends of the winding bobbin 53.
According to the prior art structure as described in the above, the square shaped closed magnetic circuit core 52 was not so securely fixed to the winding bobbin 53 and there was a danger that the core cover 56 might be detached because the fitting between the winding bobbin 53 and the core cover 56 was not good enough, resulting in an insufficient fixing between the square shaped closed magnetic circuit core 52 and the winding bobbin 53.
Particularly, there was a problem of magnetic flux leakage caused by the square shaped closed magnetic circuit core 52, inserted in the through hole of the winding bobbin 53, wobbling around the periphery of the winding bobbin 53 with the through hole serving as the center axis, thereby presenting magnetic disturbances to other components or allowing noises to infiltrate into the square shaped closed magnetic circuit core 52.


DISCLOSURE OF THE INVENTION

The object of the present invention is to provide a line filter, wherein magnetic adverse effects inflicted on other components due to leakage magnetic fluxes are suppressed by securely fixing a core cover to a closed magnetic circuit core to prevent the closed magnetic circuit core from wobbling.
In order to achieve the object as described in the above, the present invention discloses a structure comprising a bobbin having flanges on its both ends and a through hole formed along its axis, a closed magnetic circuit core inserted in the foregoing through hole, a winding wound between both flanges of the foregoing bobbin in the direction perpendicular to the bobbin's axis, terminals implanted in the foregoing flanges and connected with the foregoing winding, and a wobbling preventive means to prevent the foregoing closed magnetic circuit core from wobbling.
According to the structure described in the above, the core cover and closed magnetic circuit core are securely fixed with each other by the wobbling preventive means that prevents the closed magnetic circuit core from wobbling and the closed magnetic circuit core does not wobble around the periphery of the bobbin.


BRIEF DESCRIPTION OF DRAWINGS

FIG. 1 is a perspective view of a line filter as a first exemplary embodiment of the present invention,
FIG. 2 is a perspective view of the line filter before installation of a wobbling preventive means,
FIG. 3 is a perspective view of the foregoing wobbling preventive means for the line filter,
FIG. 4(a) to FIG. 4(d) are a front view, side view, bottom view and cross-sectional view of the foregoing wobbling preventive means, respectively, and
FIG. 5 is a perspective view of the foregoing line filter using a double E shaped core.
FIG. 6 is a perspective view of a line filter as a second exemplary embodiment of the present invention and
FIG. 7 is a perspective view of a wobbling preventive means for the foregoing line filter.
FIG. 8 is a perspective view of a line

REFERENCES:
patent: 4760366 (1988-07-01), Mitsui
patent: 4779068 (1988-10-01), Sakamoto et al.
patent: 5005097 (1991-04-01), Matsuoka
patent: 5227745 (1993-07-01), Oda et al.

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