Electricity: conductors and insulators – Anti-inductive structures – Conductor transposition
Reexamination Certificate
2000-06-01
2002-02-05
Reichard, Dean A. (Department: 2831)
Electricity: conductors and insulators
Anti-inductive structures
Conductor transposition
C174S051000, C361S753000
Reexamination Certificate
active
06344609
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an electronic unit such as a voltage-controlled oscillator for use in a mobile phone.
2. Description of the Related Art
A conventional electronic unit such as a voltage-controlled oscillator will be described with reference to
FIGS. 9 through 12
.
FIG. 9
is a plan view,
FIG. 10
is a front view,
FIG. 11
is a side view, and
12
is a bottom view. A rectangular circuit board
21
is formed by stacking together a plurality of substrates. As indicated by the shaded portions in
FIG. 9
, wiring patterns
22
and grounding patterns
23
are formed on an upper surface
21
a
of the circuit board. Although not shown, the wiring patterns
22
and the grounding patterns
23
are also formed between the layers of the board.
A plurality of side through portions
21
c
consisting of arcuate recesses are formed on the four side surfaces
21
b
of the circuit board
21
. The side through portions
21
c
are equipped with side electrode portions
24
connected to the wiring patterns
22
and side electrode portions
25
connected to the grounding patterns
23
.
A plurality of wiring terminal electrode portions
26
and grounding terminal electrode portions
27
are provided at predetermined intervals on the lower side
21
d
of the circuit board
21
. The wiring terminal electrode portions
26
are connected to the side electrode portions
24
, which are connected to the wiring patterns
22
, and the grounding terminal electrode portions
27
are connected to the side electrode portions
25
, which are connected to the grounding patterns
23
.
A box-shaped cover
28
formed of a metal plate has a top wall
28
a
and side walls
28
b
which are formed by downwardly bending the four side portions of the top wall
28
a
and whose lower portions are open. Although not shown, various electronic parts are arranged on the upper surface
21
a
of the circuit board
21
, and the cover
28
is mounted to the circuit board
21
so as to cover these electronic parts.
The cover
28
is arranged on the circuit board
21
such that the side walls
28
b
are positioned on the inner side of the circuit board
21
, avoiding the side through portions
21
c
, which are recesses. Thus, a large extra space S
2
exists between the end portions of the circuit board
21
and the side walls
28
b
of the cover
28
at the periphery of the circuit board
21
. The cover
28
is mounted to the circuit board
21
by soldering the side walls
28
b
to the grounding patterns
23
.
The conventional electronic unit, constructed as described above, is surface mounted on the mother printed board (not shown) of, for example, a mobile phone, by soldering, with the wiring terminal electrode portions
26
and the grounding terminal electrode portions being placed on the mother printed board.
In the conventional electronic unit, the side electrode portions
24
and
25
are formed in the side through portions
21
c
consisting of recesses provided in the side surfaces
21
b
of the circuit board
21
, and the patterns
22
and
23
on the upper and lower surfaces of the circuit board
21
are connected to the terminal electrode portions
26
and
27
by means of the side electrode portions
24
and
25
, so that the cover
28
is arranged so as to avoid the side through portions
21
c
. Thus, a large extra space S
2
exists in the periphery of the circuit board
21
, between the end portions of the circuit board
21
and the side walls
28
b
of the cover
28
, such that the size of the circuit board
21
is rather large. This means that it is impossible to effectively utilize the entire upper surface
21
a
of the circuit board
21
as the wiring patterns
22
and thus, this conventional electronic unit is not suitable for use in a mobile phone, which requires both size and weight reductions.
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an electronic unit having both size and weight reductions.
To achieve the above object, there is provided, in a first aspect of the present invention, an electronic unit comprising a circuit board having on its upper surface a wiring pattern and a grounding pattern, an electric part arranged on the circuit board, and a cover mounted to the circuit board so as to cover the electric part. On the lower surface of the circuit board there are provided a wiring terminal electrode portion and a grounding terminal electrode portion. Connection conductors provided in respective through-holes provide connections between the wiring pattern and the wiring terminal electrode portion and between the grounding pattern and the grounding terminal electrode portion.
In a second aspect of the present invention, an electronic unit is provided wherein a recess, extending over at least the side surface and the lower surface of the circuit board, is formed at positions corresponding to the wiring terminal electrode portion and the grounding terminal electrode portion.
In a third aspect of the present invention, an electronic unit is provided wherein a cutout portion is formed by cutting a corner portion of the rectangular circuit board at a position corresponding to the wiring terminal electrode portion or the grounding terminal electrode portion.
REFERENCES:
patent: 4551747 (1985-11-01), Gilbert et al.
patent: 4614194 (1986-09-01), Jones et al.
patent: 5051869 (1991-09-01), Goldfarb
patent: 5455385 (1995-10-01), Newton et al.
patent: 5637916 (1997-06-01), Joshi
patent: 5639989 (1997-06-01), Higgins, III
patent: 5825084 (1998-10-01), Lau et al.
patent: 5864092 (1999-01-01), Gore et al.
patent: 5939817 (1999-08-01), Takado
patent: 6057600 (2000-05-01), Kitazawa et al.
patent: 10163647 (1998-06-01), None
patent: 11-340346 (1999-12-01), None
Alps Electric Co. ,Ltd.
Brinks Hofer Gilson & Lione
Oliva Carmelo
Reichard Dean A.
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