Supports – Clasp-down
Reexamination Certificate
1999-05-03
2001-02-27
Braun, Leslie A. (Department: 3632)
Supports
Clasp-down
C248S694000, C361S710000
Reexamination Certificate
active
06193205
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a retainer for a ball grid array (BGA) fan, and more particularly to a BGA fan retainer which requires no predetermined space on a substrate to mount the fan thereon, such that an operator is able to easily mount the BGA fan in a compact space.
2. Description of Related Art
A conventional method of mounting a BGA fan is shown in
FIG. 7. A
substrate (
90
) provided with a centrally located die (
91
) has a plurality of bonding wires (
92
) which are provided to electrically connect the die (
91
) to the circuit on the substrate (
90
). A plastic cover (
93
) is then formed over the die (
91
) to complete the packaging. Furthermore, a plurality of solder balls (
94
) arranged in a matrix form are formed on the bottom of the substrate (
90
) to electrically connect the die and bonding wires to a mother board, interface card or other electrical device. As with ordinary integrated circuits, a fan (
95
) is mounted on top of the cover (
93
) to dissipate excess heat generated by the packaged integrated circuit chip. Normally, the the fan (
95
) is glued to the cover (
93
). However, a simple glued connection between the fan (
95
) and the cover (
93
) will withstand a shock or vibration test required before the product shipped to the market.
To overcome this defect, a modified fan (
80
), as shown in
FIG. 8
, has a pair of extensions (
82
) (only one is shown) diagonally formed on the bottom thereof, such that the fan (
80
) is able to be securely mounted on a mother board (
98
) by means of a bolt and a nut. Although, the fan (
80
) is able to be fixed on the mother board (
98
), an additional predetermined space must be left for mounting the fan, which can be a difficult thing to do, especially on a printed circuit board (PCB).
The present invention aims to provide an improved retainer for a BGA fan to overcome the aforementioned problems.
SUMMARY OF THE INVENTION
The main object of the present invention is to provide a retainer for a BGA fan. The retainer has means for respectively fixing a pair of frame members as well as a fan securely on a substrate. The means comprise a pair of hooks each having at least one finger, at least one snap plate and an abutting foot. In order to accomplish the aforementioned objective, the frame members, which are able to secure the substrate therebetween, each has a first flange and a second flange parallel to the first flange and the space therebetween is equal to the thickness of the substrate, such that an end face of the substrate is able to be inserted into the space and thus be held therein. The abutting foot of the hook is able to securely engage the bottom face of the frame member after the finger extends into the lowest gap in the fan. Thereafter, the fan securely engaged between the pair of frame members can be securely fixed on the substrate without any additional space reserved on the substrate.
The detailed features of the present invention will be apparent after reading the following detailed description with appropriate reference to the accompanying drawings.
REFERENCES:
patent: 4716494 (1987-12-01), Bright et al.
patent: 5353863 (1994-10-01), Yu
patent: 5436798 (1995-07-01), Wieland, Jr.
patent: 5493475 (1996-02-01), Lin
patent: 5676199 (1997-10-01), Lee
Baxter Gwendolyn
Braun Leslie A.
Pelton William E.
Tennmax Trading Corp.
LandOfFree
Retainer for a BGA fan does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Retainer for a BGA fan, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Retainer for a BGA fan will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2609372