Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Reexamination Certificate
2002-04-17
2003-07-08
Chervinsky, Boris (Department: 2835)
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
C361S717000, C361S718000, C361S719000, C361S760000, C361S767000, C257S692000, C257S697000, C257S718000, C257S727000, C174S016300, C165S080300, C165S185000, C439S066000
Reexamination Certificate
active
06590772
ABSTRACT:
BACKGROUND OF THE INVENTION
(a) Field of the Invention
The present invention relates to a CPU and circuit board mounting arrangement and, more particularly to such a CPU And circuit board mounting arrangement, which enables a CPU without contact pins to be vertically loaded in a CPU connector and electrically connected to a circuit at the bottom side of the CPU connector.
(b) Description of the Prior Art
Regular CPUs, subject to their mounting design, include two types, i.e., the CPU
10
with pins
101
(see FIG.
1
), and the CPU
20
with solder balls
201
(see FIG.
2
). The procedure of installing pins
101
in the bottom pads of the CPU
10
is complicated and critical. In order to achieve satisfactory electric conductivity, the pins
101
are plated with a layer of gold. The gold coating greatly increases the cost of the pins
101
. Further, the pins
101
may be biased or broken during installation. The CPU
20
shown in
FIG. 2
is provided with solder balls
201
at the bottom side for reflow-soldering to a circuit board
30
directly (see FIG.
3
). The CPU mounting design still has drawbacks. The use of the expensive cost of the solder balls
201
greatly increases the installation cost. The installation of the solder balls
201
is also complicated. Furthermore, the CPU
20
cannot be removed from the circuit board
30
for repair or replacement when soldered.
FIG. 4
shows the installation of the CPU
10
with pins
101
in a CPU connector
40
at a circuit board
30
. During installation, the pins
101
of the CPU
10
are respectively inserted into the respective terminal slots
401
of the CPU connector
40
, and then the locking lever
402
of the CPU connector
40
is turned in direction “a” to shift the top cover plate
403
of the CPU connector
40
forwards from the unlocking position to the locking position, thereby causing the pins
101
to be moved from the non-contact position shown in
FIG. 5
to the contact position shown in
FIG. 6
where a pin
101
is forced into contact with a respective contact plate
404
, which is provided with a solder ball
405
at the bottom side that is reflow-soldered to the circuit board
30
. This CPU and circuit board mounting arrangement enables the user to detach the CPU
10
from the circuit board
30
for repair or replacement. However, the gold coating of the pins
101
greatly increases the cost of the CPU
10
. Further, the pins
101
may be biased or broken during installation.
As indicated above, the aforesaid CPU connector
40
comprises a horizontally slidably top cover plate
403
, and a locking lever
402
adapted for moving the top cover plate
403
between the locking position and the unlocking position. This design of CPU connector
40
does not fit the CPU
20
with solder balls
201
.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a CPU and circuit board mounting arrangement, which eliminates the aforesaid drawbacks. According to one aspect of the present invention, the CPU and circuit board mounting arrangement comprises a circuit board, a CPU connector soldered to the circuit board, and a CPU installed in the CPU connector and electrically connected to respective contacts of the circuit board. The CPU connector comprises a plurality of terminals soldered to respective contacts of the circuit board and so installed that the CPU is vertically loaded in the CPU connector, keeping respective bottom pads of the CPU in contact with the terminals of the CPU connector respectively, achieving electric connection between the CPU and the circuit board. According to another aspect of the present invention, the CPU connector comprises a plurality of terminal slots, which hold the terminals respectively in a sloping position for contacting the bottom pads of the CPU. According to still another aspect of the present invention, the terminals of the CPU connector each have a top contact end sloping in one direction for contacting the bottom pads of the CPU positively. According to still another aspect of the present invention, a heat sink is fastened to the circuit board and pressed on the CPU, keeping the CPU in contact with the terminals of the CPU connector. According to still another aspect of the present invention, a pressure member may be directly pivoted to the CPU connector and locked by lock means to hold down the CPU in the CPU connector, keeping the bottom pads of the CPU in contact with the terminals of the CPU connector positively.
REFERENCES:
patent: 5309324 (1994-05-01), Herandez et al.
patent: 5528462 (1996-06-01), Pendse
patent: 5641945 (1997-06-01), Abe et al.
patent: 5761036 (1998-06-01), Hopfer et al.
patent: 6007349 (1999-12-01), Distefano et al.
patent: 6016254 (2000-01-01), Pfaff
patent: 6164981 (2000-12-01), Lin et al.
patent: 6286208 (2001-09-01), Shih et al.
patent: 6330164 (2001-12-01), Khandros et al.
patent: 6396701 (2002-05-01), Nakamura et al.
patent: 6449162 (2002-09-01), Corbin et al.
Bacon & Thomas
Chervinsky Boris
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