1. Field of the Invention
The present invention relates to electrical connectors, and more particularly to a land grid array (LGA) connector for electrically connecting an electronic package such as a CPU chip, to a circuit substrate such as a printed circuit board (PCB).
2. Description of the Prior Art
Land grid array (LGA) connectors are commonly used in personal computer (PC) systems, for electrically connecting CPU chips to PCBs. This kind of connectors can avoid soldering procedures during being mounted on the PCBs.
In use, the CPU chip 3′ is disposed on the housing 2′. The load plate 5′ is pressed down onto the CPU chip 3′, pressing portions (not numbered) of the load plate 5′ resting on the CPU chip 3′. The lever 6′ is rotated down to engage with one side of the load plate 5′, urging the pressing portion of the load plate 5′ to press on the CPU chip 3′.
When the lever 6′ presses down on the load plate 5′, the pressing portions of the load plate 5′ push down on the CPU chip 3′. Because the load plate 5′ first urges against one side of the CPU chip 3′ near the load plate 5′ engaging with the stiffener 4′, the opposite side of the CPU chip 3′ is liable to bend upwardly. As a result, warp or even horizontal displacement of the CPU chip 3′ occurs. During insertion the CPU chip 3′ into the housing 2′, the sides of the CPU chip is prone to scrape corresponding sidewalls of the housing 2′. This can bring damage to effective electrical connection between the CPU chip 3′ and contacts 23′ of the housing 2′.
Referring also to
Therefore, a new land grid array electrical connector which overcomes the above-mentioned disadvantages of the prior art is desired.
Accordingly, one object of the present invention is to provide a new LGA connector, whereby the connector can avoid scraping damage to housing of the connector during insertion a CPU chip into the housing or extraction the CPU chip from the housing.
To achieve the aforementioned object, an LGA connector in accordance with a preferred embodiment of the present invention is provided. The LGA connector comprises an insulative housing, a plurality of contacts received in the housing, a load plate and a lever mounted to opposite sides of the housing respectively. The housing has a bottom floor and sidewalls extending upwardly from the floor. A receiving space is defined between the floor and the sidewalls, for accommodating a CPU chip therein. At least one block member is formed on the sidewalls. Said block member partly protrudes into the receiving space, for avoiding scraping damage of sidewalls of the housing during insertion of the CPU chip into the housing and during extracting of the CPU chip from the housing.
Other objects, advantages and novel features of the present invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:
Reference will now be made to the drawings to describe the present invention in detail.
Referring to
The housing 2 is configured with a bottom floor 20, two opposite first sidewalls 24 and two opposite second sidewalls 26 interconnecting the first sidewalls 24. The floor 20 is disposed between the first and second sidewalls 24,26. A central cavity 200 is defined in the floor 20. A receiving space is defined between the floor 20 and the first and second sidewalls 24,26, for accommodating the CPU chip 3 therein. A plurality of passageways 22 is defined in the floor 20, for receiving the contacts 23 therein. The first sidewalls 24 each form a plurality of alternate protrusions 240 and grooves 242. Slant guiding faces 260 are formed on the second sidewalls 26 and the end of the first sidewalls 24 adjacent the second sidewalls 26, for facilitating insertion the CPU chip 3 into the housing 2. A step 263 is formed in a joint portion of the floor 20 and the second sidewalls 26, to support the CPU chip 3 thereon. This thereby can protect the contacts 23 from damage with excessive pressure. Cutouts 264 are defined in respective middle of the second sidewalls 26, for engaging with the CPU chip 3. This, therefore, facilitates placement the CPU chip 3 into the housing 2 and extraction of the CPU chip 3 thererfrom. First and second bosses 265,266 are respectively formed on inner sides of the second sidewalls 26. The first and second bosses 265,266 depend at bottom thereof on the step 263, for fixing the CPU chip 3 in the space of the housing 2. A pair of locking blocks 28 protrudes from outside of one of the second sidewalls 26, for abutting against and fastening the load plate 5 attached thereon. A recess 268 is defined in a joint portion of the second sidewalls 26 and the first sidewalls 24. The recess 268 is oriented toward the receiving space of the housing 2, in communication there with the space. A complementary block member 269 is disposed in the recess 268(referring to
Referring to
As referring to
The CPU chip 3 has a generally longitudinal configuration. A pair of rectangular lips 30 respectively extends from two opposite sides of the CPU chip 3. The lips 30 are adapted to engage with the cutouts 264 of the housing 2, for facilitating placement of the CPU chip 3 into the housing 2 and displacement the CPU chip 3 from the housing 2. A first and second notch 32, 33 are respectively defined in the opposite sides of the CPU chip 3, for engaging with the corresponding first and second bosses 265,266 of the housing 2, respectively. Further, a heat sink 34 is attached to a middle portion of top surface (not numbered) of the CPU chip 3, for dissipating heat. In assembly, the CPU chip 3 is pressed down into the housing 2, wherein two opposite sides of the CPU chip 3 are sustained on the step 263, and the corresponding lateral edges of the opposite sides are abutted against the inner surfaces 2694,2695 of the block member 269.
The load plate 5 is generally a rectangular frame. The load plate 5 has a first and second lateral sides 50,52, and two opposite sides (not numbered) connecting the first and second lateral sides 50,52. An engaging portion 500 is arcuately extended from a middle portion of the first lateral side 50. The engaging portion 500 forms an engaging surface 502 thereon. A pair of spaced arcuate clasps 504 symmetrically extends from the second lateral side 52. A fastening leg 506 is formed between the clasps 504, the clasps 504 and the fastening leg 506 engaging with the stiffener 4. The locking blocks 28 of the housing 2 abut against inner surface of the clasps 504, for fastening the load plate 5 on the housing 2. Pressing portions 54 are respectively protrude from a middle portion of the opposite sides to the direction of the space of the housing 2.
The lever 6 is substantially a crank. The lever 6 has a locating portion 60, an operation handle 62, and an offset cam portion 64. The locating portion 60 is pivotably mounted on one side of the load plate 5. The operation handle 62 extends perpendicularly from an end of the locating portion 60. The cam portion 64 is parallel to the locating portion 60 and formed at a middle portion thereof. The operation handle 62 is driven to move the connector between an open position and a closed position.
In insertion, once the CPU chip3 is positioned on the housing 2, the lever 6 is rotated down from a vertical position to a horizontal position. The cam portion 64 of the lever 6 urges the engaging portion 500 of the load plate 5. Then the load plate 5 presses onto the CPU chip 3. And the pressing portions 54 of the load plate 5 push the CPU chip 3 downwardly. Thereby the CPU chip 3 is pressed slowly down into the housing 2. When the CPU chip 3 is slant positioned in the housing 2 (as refers to
While the present invention has been described with reference to a preferred embodiment, the description is illustrative and is not to be construed as limiting the invention. Therefore, various equivalent modifications and changes known to persons skilled in the art according to the spirit of the present invention are considered within the scope of the present invention as defined in the appended claims.
Number | Date | Country | Kind |
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9292215273 | Aug 2003 | TW | national |