Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
1999-11-17
2001-06-19
Gandhi, Jayprakash N. (Department: 2841)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S752000, C361S753000, C361S758000, C361S807000, C174S13800J, C220S004020
Reexamination Certificate
active
06249442
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a printed circuit mounting structure suitable for use in a transmitter-receiver of a personal computer for example.
2. Description of the Prior Art
As an example, a conventional printed circuit mounting structure applied to a data transmitter-receiver of a personal computer will now be described with reference to
FIG. 6. A
case
21
, which is formed in a box shape using a metallic plate, comprises a flat plate-lie bottom wall
21
a
, side walls
21
b
bent upward from side edges of the bottom wall
21
a
, an accommodating portion
21
c
surrounded with the bottom wall
21
a
and side walls
21
b
, projecting portions
21
d
formed on the bottom wall
21
a
so as to project into the accommodating portion
21
c
, and holes
21
e
formed in the projecting portions
21
d.
A case
22
formed by molding a synthetic resin comprises an upper wall
22
a
, side walls
22
b
formed downward from peripheral edges of the upper wall
22
a
, an accommodating portion
22
c
surrounded with the upper wall
22
a
and side walls
22
b
, a plurality of long mounting projections
22
d
positioned in the accommodating portion
22
c
and projecting downward from the upper wall
21
a
, a plurality of mounting projections
22
e
of a medium length projecting downward from the upper wall
21
a
, and a plurality of short mounting projections
22
f
projecting downward from the upper wall
21
a.
A first printed circuit
23
having a plurality of holes
23
a
and
23
b
is formed with a plurality of holes
23
a
,
23
b
and carries various electric components (not shown) and a connector
24
thereon. A high-frequency circuit is formed on the first printed circuit board
23
.
A second printed circuit board
25
having a plurality of holes
25
a
is formed with electrically conductive patterns (not shown) and carries various electric components (not shown) and a connector
26
thereon. A low-frequency circuit such as a logic circuit is formed on the second printed circuit board
25
.
The first printed circuit board
23
is mounted in the following manner. With the mounting projections
22
e
inserted into the holes
23
b
, the first printed circuit board
23
is put on the tops of the mounting projections
22
f
and thereafter a plurality of screws
27
are threaded into the mounting projections
22
f
through the holes
23
a
, thereby mounting the first printed circuit board
23
to the mounting projections
22
f.
The second printed circuit board
25
is mounted in the following manner. First, the connector
26
is inserted into the connector
24
, then the second printed circuit board
25
is put on the tops of the mounting projections
22
e
and a plurality of screws
28
are threaded into the mounting projections
22
e
through the holes
25
a
, thereby mounting the second printed circuit board
25
to the mounting projections
22
e.
The case
21
is mounted in the following manner. The projecting portions
21
d
are put on the tops of the mounting projections
22
d
and thereafter a plurality of screws
29
are threaded into the mounting projections
22
d
through the holes
21
e
, thereby mounting the case
21
to the mounting projections
22
d.
The first and second printed circuit boards
23
,
25
thus assembled are then received into the accommodating portions
21
c
and
22
c.
In the conventional printed circuit board mounting structure, the first and second printed circuit boards
23
,
25
are mounted to different mounting projections
22
e
and
22
f
respectively, thus giving rise to the problem that the mounting work is troublesome, productivity is low, and cost increases.
Also as to the case
21
, since it is mounted to the mounting projections
22
d
different from the mounting projections for the printed circuit boards
23
and
25
, there arises the problem that the number of mounting steps increases, productivity is low, and cost increases.
SUMMARY OF THE INVENTION
It is an object of the present invention to solve the above-mentioned problems.
According to a first embodiment of the present invention for solving the above-mentioned problems there is provided a printed circuit board mounting structure comprising a case formed by molding a synthetic resin, a plurality of mounting projections formed on the case, two, first and second printed circuit boards having electrically conductive patterns and holes, spacers interposed between the first and second printed circuit boards and having holes, a mounting body having holes and constituting a chassis, and screws for mounting the first and second printed circuit boards to the mounting body, wherein the mounting projections are inserted into the holes of the first and second printed circuit boards and the holes of the spacers, and the screws are inserted into the holes of the mounting body and are threaded into the tops of the mounting projections to push the first and second printed circuit boards and the spacers to the case side through the mounting body.
According to a second embodiment of the present invention for solving the foregoing problems, with the mounting projections not inserted through the holes of the second printed circuit board disposed on the mounting body side, the tops of the mounting projections are positioned in proximity to the mounting body and a part of the mounting body is brought into abutment against the second printed circuit board, causing the mounting body to push the second printed circuit board.
According to a third embodiment of the invention, the spacers are formed using a metallic material and end portions of the spacers are brought into abutment with the electrically conductive patterns formed on the first and second printed circuit boards to provide a connection between the patterns on both printed circuit boards through the spacers.
According to a fourth embodiment of the invention, the mounting body is formed using a metallic material, electrically conductive patterns are formed on both sides of the second printed circuit board, connecting conductors are provided in through holes formed in the second printed circuit board to connect the electrically conductive patterns formed on both sides of the board with each other, one electrically conductive patterns are brought into abutment with the mounting body and the other brought into abutment with end portions of the spacers, to connect earth electrodes on the first and second printed circuit boards to the mounting body.
REFERENCES:
patent: 4200900 (1980-04-01), McGeorge
patent: 4855873 (1989-08-01), Bhargave et al.
patent: 5111362 (1992-05-01), Flamm et al.
patent: 5575686 (1996-11-01), Noschese
patent: 5715141 (1998-02-01), Karlsson
patent: 6027345 (2000-02-01), McHugh et al.
patent: 8-153986 (1996-06-01), None
patent: 9-331180 (1997-12-01), None
Alps Electric Co. Ltd
Brinks Hofer Gilson & Lione
Gandhi Jayprakash N.
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