Inductor devices – Coil or coil turn supports or spacers – Printed circuit-type coil
Reexamination Certificate
2002-08-13
2004-08-31
Donovan, Lincoln (Department: 2832)
Inductor devices
Coil or coil turn supports or spacers
Printed circuit-type coil
C336S065000, C336S180000, C336S182000, C336S232000, C174S265000
Reexamination Certificate
active
06784780
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a coupling adjusting structure for a double-tuned circuit which is suitably used for a TV tuner and the like.
2. Description of the Related Art
A configuration of a known coupling adjusting structure for a double-tuned circuit will be described with reference to
FIG. 11. A
printed circuit board
51
has a variety of electrical components (not shown) disposed thereon including first and second tuned circuits
52
and
53
formed side by side.
First and second coils
54
and
55
serving as a part of the first and second tuned circuits
52
and
53
have windings
54
a
and
55
a
formed by winding wires, and two pairs of fixing legs
54
b
and
55
b
disposed at the ends of the windings
54
a
and
55
a
, respectively.
The first and second coils
54
and
55
are configured such that the windings
54
a
and
55
a
are mounted on the printed circuit board
51
in an upright manner while being close to each other, and the fixing legs
54
b
and
55
b
are passed through the printed circuit board
51
and soldered to corresponding conductive patterns (not shown) formed on the lower surface of the printed circuit board
51
.
In the double-tuned circuit having such a configuration, an inductive coupling is adjusted by deforming free corresponding ends of the mutually opposing windings
54
a
and
55
a
of the first and second coils
54
and
55
in the opposing directions indicated by the arrows Z in the figure.
The known coupling adjusting structure for a double-tuned circuit is configured such that the windings
54
a
and
55
a
are disposed in an upright manner against the printed circuit board
51
so as to deform a part of each of the windings
54
a
and
55
a
of the first and second coils
54
and
55
, respectively, giving rise to a problem in that the double-tuned circuit is tall.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a thin and easily-adjustable coupling adjusting structure for a double-tuned circuit.
In view of the above described problem, according to one aspect of the present invention, a coupling adjusting structure for a double-tuned circuit, comprises: a printed circuit board; a first tuned circuit comprising a first coil formed by a combination of first and second conductive patterns formed on first and second surfaces of the printed circuit board, respectively; and a second tuned circuit comprising a second coil formed by another combination of other first and second conductive patterns formed on the first and second surfaces of the printed circuit board, respectively. The first and second coils are configured such that the first conductive patterns formed on the first surface of the printed circuit board and the corresponding second conductive patterns formed on the second surface of the printed circuit board are connected to each other via corresponding connecting conductors, one end of the first coil and the corresponding end of the second coil are disposed close to each other, at least one first ground conductive pattern is disposed at least on the first surface of the printed circuit board, and at least one first jumper connected to the first ground conductive pattern is disposed between the first and second coils so as to adjust an inductive coupling of the double-tuned circuit.
In the coupling adjusting structure for a double-tuned circuit, a first island conductive pattern which is out of conduction with the first ground conductive pattern is preferably provided between the first and second coils and on the first surface of the printed circuit, and the first jumper is preferably connected to the first ground conductive pattern and the first island conductive pattern.
Also, in the coupling adjusting structure for a double-tuned circuit, at least one second ground conductive pattern and a second island conductive pattern which lies between the first and second coils and which is out of conduction with the second ground conductive pattern are preferably provided on the second surface of the printed circuit board, the first and second ground conductive patterns are preferably connected to each other via a conductor, and the first and second island conductive patterns are preferably connected to each other via another conductor.
In addition, in the coupling adjusting structure for a double-tuned circuit, at least one second jumper is preferably connected to the second ground conductive pattern and the second island conductive pattern so as to adjust the inductive coupling.
According to another aspect of the present invention, a coupling adjusting structure for a double-tuned circuit comprises: a printed circuit board; a first tuned circuit comprising a first coil formed by a combination of first and second conductive patterns formed on first and second surfaces of the printed circuit board, respectively; and a second tuned circuit comprising a second coil formed by another combination of other first and second conductive patterns formed on the first and second surfaces of the printed circuit board, respectively. The first and second coils are configured such that the first conductive patterns formed on the first surface of the printed circuit board and the corresponding second conductive patterns formed on the second surface of the printed circuit board are connected to each other via corresponding connecting conductors, one end of the first coil and the corresponding end of the second coil are disposed close to each other, at least one first ground conductive pattern comprising a first adjusting conductive pattern extending between the first and second coils is disposed at least on the first surface of the printed circuit board, and the first adjusting conductive pattern is cut off by at least one first break so as to adjust an inductive coupling of the double-tuned circuit.
In the coupling adjusting structure for a double-tuned circuit, at least one second ground conductive pattern comprising a second adjusting conductive pattern extending between the first and second coils is preferably provided on the second surface of the printed circuit board, and the first and second ground conductive patterns are preferably connected to each other via a conductor.
Also, in the coupling adjusting structure for a double-tuned circuit, the second adjusting conductive pattern is preferably cut off by at least one second break so as to adjust the inductive coupling.
REFERENCES:
patent: 3836881 (1974-09-01), Koizumi
patent: 5777277 (1998-07-01), Inagawa
patent: 132 226 (1978-09-01), None
patent: 0 497 556 (1992-08-01), None
patent: 01 135 234 (1989-05-01), None
patent: 04-245410 (1992-09-01), None
patent: 04 290 005 (1992-10-01), None
patent: 10-303 026 (1998-11-01), None
patent: 10303026 (1998-11-01), None
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Donovan Lincoln
Poker Jennifer A.
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