Electrical connectors – Preformed panel circuit arrangement – e.g. – pcb – icm – dip,... – Distinct contact secured to panel circuit
Reexamination Certificate
1999-09-20
2002-01-01
Cuneo, Kamand (Department: 2841)
Electrical connectors
Preformed panel circuit arrangement, e.g., pcb, icm, dip,...
Distinct contact secured to panel circuit
C174S260000, C174S261000
Reexamination Certificate
active
06334782
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a printed-circuit board with conductive circuit patterns formed thereon for electric connections to electronic parts.
2. Description of the Related Art
FIG. 5
depicts a conventional printed-circuit board
100
on which there are merely formed electrically isolated conductive circuit patterns
101
.
On the other hand, since tin and lead in solder have a harmful effect on the human body and cause environmental destruction when the printed-circuit boards are disposed of, a jack
103
is used to provide electric connections by pressure contact without the use of the solder.
As shown in
FIGS. 5 through 7
, the jack
103
has an insulating housing
105
, a cylindrical portion
107
formed integrally therewith and having a plug insertion hole
106
, and terminals
104
partly projecting down through the bottom of the insulating housing
105
, the projecting portions being bent so that they are resiliently deformable in the vertical direction in FIG.
5
.
The jack
103
has its insulating housing
105
fixed to a case of equipment (not shown). By fixing the printed-circuit board
100
to the case, the terminals
104
are pressed against the conductive circuit patterns
101
of the board
100
to establish electric connections therebetween.
With such a printed-circuit board
100
, electric signals from a plug (not shown) inserted in the plug insertion hole
106
are applied via the terminals
104
to the conductive circuit patterns
101
, through which they are provided to other electric parts (not shown) connected to the patterns
101
. Alternatively, electric signals transmitted through the conductive circuit patterns
101
are fed to the plug received in the plug insertion hole
106
.
Since the connection between the terminals
104
of the jack
103
and the conductive circuit patterns
101
depends on the pressure contact, not the soldering, what is called fretting (or chafing) corrosion is caused by vibrations or shocks. That is, the conductive circuit patterns
101
are ablated by the terminals
104
to form metal powder, which shorts the electrically isolated conductive circuit patterns
101
, causing electronic parts associated therewith to malfunctions or damage to them.
SUMMARY OF THE INVENTION
It is therefore an object of the present invention to provide a printed-circuit board which ensures preventing malfunctions of electronic parts and damage thereto.
The printed-circuit board according to the present invention is characterized in that desired conductive circuit patterns formed thereon are separated by protection or partition walls higher than the circuit patterns.
With terminals of electronic parts connected to the conductive circuit patterns, electric signals from the former are applied to the latter and vice versa.
In the event that metal powder results from fretting corrosion, it is prevented by the protective walls from shorting the conductive circuit patterns.
REFERENCES:
patent: 4303291 (1981-12-01), Dines
patent: 5315070 (1994-05-01), Maiward
patent: 5386087 (1995-01-01), Lee et al.
patent: 5965843 (1999-10-01), Schónberger et al.
patent: 6133534 (2000-10-01), Fukutami et al.
patent: 55-96675 (1980-07-01), None
patent: 60-61754 (1985-04-01), None
patent: 64-50595 (1989-02-01), None
patent: 6-38272 (1994-05-01), None
patent: 7-18463 (1995-03-01), None
Kanemoto Yosuke
Sasa Motokazu
Suzuki Yoshiaki
Cuneo Kamand
Pearne & Gordon LLP
SMK Corporation
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