Inductor devices – Core forms casing
Utility Patent
1998-10-30
2001-01-02
Gellner, Michael L. (Department: 2832)
Inductor devices
Core forms casing
C336S200000, C336S231000, C336S225000
Utility Patent
active
06169470
ABSTRACT:
TECHNICAL FIELD
The present invention relates to a coiled component for use in various electronic appliances and communication appliances.
BACKGROUND ART
Coiled components are frequently used as coils and transformers for various electronic appliances and communication appliances and demand for more compact and thinner coiled components is increasing recently. Furthermore, in response to higher frequency and digitization of circuits, the coiled components play a vital role more and more so as to reduce noises.
Conventionally, a planar spiral coiled component in which a coil has a planar spiral shape as disclosed in, for example, EP-A-435160 or a spatial spiral laminated coiled component in which a ferrite magnetic layer and a coil conductive layer are laminated on one another alternately as disclosed in, for example, Japanese Patent Publication No. 57-39521 (1982) is known as a coiled component satisfying such requirements. In this spatial spiral laminated coiled component, a ferrite layer
51
is formed on about a half of a ferrite green sheet
50
by printing as shown in
FIGS. 35 and 36
. A substantially L-shaped conductive pattern
52
is formed by printing on a portion of the ferrite green sheet
50
free from the ferrite layer
51
and a portion of the ferrite layer
51
. Then, a ferrite layer
53
having a size equal to about a half of that of the green sheet
50
is printed on the conductive pattern
52
and a U-shaped conductive pattern
54
is printed on the ferrite layer
51
and a portion of the ferrite layer
53
so as to be connected to the conductive pattern
52
. After repeating this process several times, the substantially L-shaped conductive pattern
52
is printed and then, the ferrite green sheet
50
is laminated on this uppermost conductive pattern
52
. Subsequently, this laminated structure is finally subjected to collective firing and electrodes
55
are, respectively, provided on opposite end faces of the laminated structure.
In order to achieve high inductance in the known laminated coiled component of the above described construction, the number of the conductive patterns
54
should be increased. As a result, since an extremely large number of the ferrite layers
53
and the conductive patterns
54
should be laminated on one another by printing, the number of production processes increases, thereby resulting in poor productivity. Furthermore, since the conductive patterns
54
are formed through the ferrite layers
51
and
53
so as to confront each other, stray capacity between the conductive patterns
54
becomes large, so that self resonant frequency and withstand voltage of the known laminated coiled component decrease undesirably.
Furthermore, in the known laminated coiled component, each of the conductive patterns
52
and
54
is formed on the portion of each of the ferrite layers
51
and
53
. Thus, if thickness of the conductive patterns
52
and
54
is increased so as to reduce electric resistance of the coiled component, each lamination differs greatly in thickness between a portion having the conductive pattern
52
or
54
and the remaining portion having no conductive pattern
52
or
54
. Therefore, even if the laminated structure is subjected to firing, the laminated structure is likely to crack and thus, the known laminated coiled component does not have a sufficiently stable quality.
SUMMARY OF THE INVENTION
Accordingly, the present invention has for its object to provide, with a view to eliminating the above mentioned disadvantages of prior art, a coiled component which is high in productivity and has excellent electrical characteristics such as reduced stray capacity.
In order to accomplish this object, a coiled component according to the present invention comprises: an insulating member; a conductive member which is provided in the insulating member and has a plurality of turns gradually different, in diameter, from each other from one end towards the other end of the conductive member such that at least the turns of the conductive member are disposed in different planes, respectively; and a magnetic layer which is provided on at least one of upper and lower faces of the insulating member.
In accordance with the present invention, an coiled component having high productivity and excellent electrical characteristics is obtained.
This object and features of the present invention will become clear from the following description taken in conjunction with the preferred embodiments thereof with reference to the accompanying drawings throughout which like parts are designated by like reference numerals.
REFERENCES:
patent: 770432 (1904-09-01), Kinraide
patent: 3971126 (1976-07-01), Buhrer
patent: 5225969 (1993-07-01), Takaya et al.
patent: 5363080 (1994-11-01), Breen
patent: 5761791 (1998-06-01), Bando
patent: 0 157 927 (1985-10-01), None
patent: 0 435 160 (1991-07-01), None
patent: 828291 (1956-01-01), None
patent: 828291 (1960-02-01), None
patent: 6-120024 (1994-04-01), None
Harada Shinji
Ibata Akihiko
Kawamata Tadashi
Gellner Michael L.
Matsushita Electric - Industrial Co., Ltd.
Nguyen Tuyen T.
Wenderoth , Lind & Ponack, L.L.P.
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