Inductance device

Details Inductance device Inductance device

2003-05-20

2004-06-08

Mai, Anh (Department: 2832)

Inductor devices

Core forms casing

C336S212000, C336S192000

Reexamination Certificate

active

06747538

ABSTRACT:

TECHNICAL FIELD
The present invention relates to an inductance device used in various electronic apparatuses.
BACKGROUND ART
A conventional inductance device is described hereinafter with reference to the accompanying drawings. Japanese Patent Application Non-Examined Application No. H10-294221 discloses one of the conventional inductance devices.
FIG. 10
is a perspective bottom view of the conventional inductance device, and
FIG. 11
is an exploded perspective view of the inductance device shown in FIG.
10
.
In FIG.
10
and
FIG. 11
, the conventional inductance device comprises the following elements:
drum core
24
;
winding
25
;
ring core
26
; and
terminals
27
.
Drum core
24
has upper brim
22
on a first end of roller shaft
21
and lower brim
23
on a second end of roller shaft
21
. Diameters of those two brims are approx. the same. Winding
25
is wound on shaft
21
. Ring core
26
has a sectional view of a ring shaped hollow-cylinder, and is disposed outside drum core
24
. Ring core
26
is fixed to drum core
24
with adhesive. Respective two terminals
27
are mounted to ring core
26
, and electrically connected to the two winding-ends.
One of each terminal
27
has mount-section
28
to be mounted to a board of an apparatus, and fit-section
29
to be fitted to ring core
26
. Each terminal
27
is fitted to ring core
26
from the outside such that the two terminals are on diagonally opposite positions.
When this conventional inductance device is mounted on a board, drum core
24
is positioned such that a space is provided between lower brim
23
and the board.
In this conventional structure, drum core
24
and ring core
26
are supported by only two fit-sections
29
, and mounted to the board. In general, cores
24
and
26
are fragile because they are made of sintered magnetic material such as ferrite. Therefore, when a shock is applied to this conventional inductance device, cracks occur on ring core
26
around fit-section
29
. Both of drum core
24
and ring core
26
thus sometimes fall away from the board leaving vicinity of fit-sections
29
of terminals
27
on the board. As such, the conventional inductance devices are vulnerable to shocks.
DISCLOSURE OF THE INVENTION
The present invention addresses to the problem discussed above, and aims to provide an inductance device of which shock-proofness is improved. The inductance device of the present invention is thus free from falling away from a mounted-board with fit-sections of terminals left on the board when a shock is applied to the drum core or the ring core.
The inductance device of the present invention comprises the following elements:
(a) a drum core having an upper brim on a first end of a roller shaft and a lower brim on a second end of the roller shaft;
(b) a winding wound on the roller shaft;
(c) a ring core having grooves, disposed outside the drum core and fixed to the drum core; and
(d) terminals, for connecting electrically the winding thereto, including:
(d-1) fit-sections for fitting the terminals to the ring core by putting parts of the respective fit-sections into the grooves; and
(d-2) mount-sections, for mounting the inductance device to an apparatus, linked to the respective fit-sections and extending inward along the lower brim of the drum core from near perimeter of the ring core.
When a shock is applied to the inductance device of the present invention, the structure discussed above allows the shock applied to the drum core or the ring core to disperse into the mount-sections of the terminals. The stresses applied to the fit-sections of the terminals are thus relaxed. As a result, cracks on the ring core around the fit-sections can be restrained, and the shock-proofness of the inductance device is improved.


REFERENCES:
patent: 4314221 (1982-02-01), Satou et al.
patent: 5382937 (1995-01-01), Saitoh et al.
patent: 5572788 (1996-11-01), Saitoh et al.
patent: 5751203 (1998-05-01), Tsutsumi et al.
patent: 6538546 (2003-03-01), Serino et al.
patent: 6583699 (2003-06-01), Yokoyama
patent: 0 945 880 (1999-09-01), None
patent: 10-294221 (1998-11-01), None
patent: 02000340428 (2000-12-01), None
patent: 02002231533 (2002-08-01), None
Patent Abstracts of Japan, vol. 2000, No. 08, Oct. 6, 2000 & JP 2000 150244 A (Tokyo Coil Engineering KK), May 30, 2000, Abstract; figures.
Patent Abstracts of Japan, vol. 1995, No. 11, Dec. 26, 1995 & JP 07 220929 A(Sumida Denki KK), Aug. 18, 1995, abstract.

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