Electricity: conductors and insulators – Boxes and housings – Hermetic sealed envelope type
Reexamination Certificate
2002-11-01
2004-09-14
Ngo, Hung V. (Department: 2831)
Electricity: conductors and insulators
Boxes and housings
Hermetic sealed envelope type
C333S001100, C333S024200
Reexamination Certificate
active
06791028
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a non-reversible circuit device such as a circulator and an isolator for use as a high frequency device which operates in a microwave band.
2. Description of the Related Art
The configuration of a prior art non-reversible circuit device will be described with reference to FIG.
4
. The device contains a disk-shaped ferrimagnetic plate
51
.
A laminated substrate
52
is formed by laminating a plurality of insulation layers. A concavity
52
a
is formed in the center of the substrate
52
.
First, second, and third central conductors
53
,
54
, and
55
comprising electroconductive plates of copper or the like are arranged at 120 degree intervals and have different heights in the vertical direction of the laminated substrate
52
. The central conductors
53
,
54
, and
55
are electrically insulated from each other, and are arranged in such a manner that a part of the respective central conductors cross each other in the vertical direction of the laminated substrate.
One-side ends of the first, second, third central conductors
53
,
54
, and
55
are introduced to one surface (upper surface)
52
b
of the laminated substrate
52
via connecting conductors
56
a,
56
b,
and
56
c
placed in through-holes (not shown) formed in the laminated substrate
52
, and form input-output terminals
53
a,
54
a,
and
55
a,
respectively.
Moreover, the other-side ends of the first, second, and third central conductors
53
,
54
, and
55
are introduced to the one surface (upper surface)
52
b
of the laminated substrate
52
via connecting conductors
57
a,
57
b,
and
57
c
placed in through-holes (not shown) formed in the laminated substrate
52
, and form input-output terminals
53
b,
54
b,
and
55
b
respectively.
The ferrimagnetic member
51
is disposed in the concavity
51
a
of the laminated substrate
52
. In this state, a DC magnetic field is applied to the ferrimagnetic member
51
by means of a magnet (not shown) disposed in the neighborhood of the part of the device where the first, second, and third central conductors
53
,
54
, and
55
cross each other. Thus, inputting and outputting is carried out through the input-output terminals
53
b,
54
b,
and
55
b.
The ferrimagnetic member
51
, the laminated substrate
52
, and the magnet (not shown) are covered with a yoke (not shown in
FIG. 4
) to form a non-reversible circuit device. The non-reversible circuit device is mounted onto a circuit substrate. Moreover, capacitors mounted on the circuit substrate are connected to the input-output terminals
53
a,
54
a,
and
55
a
of the first, second, and third central conductors
53
,
54
, and
55
via a wiring pattern.
In the case of the prior art non-reversible circuit device, the connecting conductors
57
a,
57
b,
and
57
c
used to form the ground terminals
53
b,
54
b,
and
55
b
are disposed at the positions in the device which are radially projected from the ferrimagnetic member
51
. This causes a problem in that the size of the laminated substrate
52
is increased in the radial direction.
Moreover, since the capacitors are mounted on the laminated substrate
52
, the space factor of the non-reversible circuit device is inferior, so that the size of the device is increased.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide a compact non-reversible circuit device having a laminated substrate reduced in size.
According to the present invention, there is provided A non-reversible circuit device which comprises a ferrimagnetic member, and first, second, and third central conductors arranged on and/or in a laminated substrate at different heights in the vertical direction of the laminated substrate, wherein a part of the respective central conductors cross each other in the vertical direction of the laminated substrate, one ends of the respective first, second, and third central conductors constitute input-output terminals, and the other ends thereof are introduced to one surface of the laminated substrate to constitute ground terminals, and the ferrimagnetic member has electrode portions and is arranged on the one surface of the laminated substrate so that the ground terminals are connected to the electrode portions, respectively. Accordingly, the ground terminals of the central conductors can be positioned so as not to project from the ferrimagnetic member. Thus, the laminated substrate can be reduced in size. A small-sized non-reversible circuit device can be provided.
Preferably, the electrode portions are formed on one surface of the ferrimagnetic member opposed to the laminated substrate. Thus, the ground terminals can be easily connected to the electrode portions. The production efficiency is enhanced.
The ferrimagnetic member preferably has a side electrode portion formed on the side-surface of thereof so as to be connected to the electrode portions. Therefore, the electrode portions can be easily connected to the second yoke via the side electrode portion. Work for the connection can be easily performed.
Also, the ferrimagnetic member has a lower electrode portion formed on the other surface thereof so as to be connected to the side electrode portion. Therefore, the lower electrode potion can be securely connected to the second yoke, and the ground terminals can be securely grounded.
Preferably, the input-output terminals are formed on the one surface of the laminated substrate, respectively. Accordingly, the input-output terminals can be provided on the same surface of the laminated substrate. The wiring workability is enhanced.
Also, the input-output terminals preferably are formed so as to extend onto the side surface of the laminated substrate. Therefore, wiring can be carried out on the side surface of the laminated substrate, not projecting from the upper surface of the laminated substrate. A thin non-reversible circuit device can be provided.
Preferably, the device further comprises chip-type capacitors which are disposed on the one surface of the laminated substrate, and one-side electrodes of the capacitors are connected to the input-output terminals, respectively. Therefore, wiring for the capacitors can be easily performed. Thus, a small-sized, compact non-reversible circuit device can be provided.
Preferably, the non-reversible circuit device further comprises a first yoke accommodating a magnet and a second yoke accommodating the ferrimagnetic member and the capacitors, the first yoke being joined to the second yoke with the magnet being disposed above the central conductors whereby the first and second yokes form a magnetic closed circuit, the electrode portion formed on the ferrimagnetic member being connected to the second yoke to be grounded, the other-side electrodes of the capacitors being connected to the second yoke to be grounded. Accordingly, the capacitors can be compactly arranged. Thus, a small-sized, compact non-reversible circuit device, compared to a prior art one, can be provided.
REFERENCES:
patent: 6696901 (2004-02-01), Takeda et al.
patent: 2003/0080820 (2003-05-01), Nozu et al.
patent: 2001-332908 (2001-11-01), None
Alps Electric Co. ,Ltd.
Ngo Hung V.
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