The present invention claims the foreign priority of TW patent application Serial No. 95106506, filed on Feb. 27, 2006, which have the same applicant and assignee as the present invention.
1. Field of the Invention
The present invention relates to the art of an electrical connector assembly having a pick up cap, and more particularly to an electrical connector assembly provided for electrically connecting a chip module to a printed circuit board (PCB).
2. Description of the Prior Art
Referring to FIG. 5-6, an electrical connector assembly is widely used in the connector industry for electrically connecting a chip module to a printed circuit board (PCB) in personal computer comprises an electrical connector 2′ and a pick up 3′. The pick up cap 3′ is mounted onto the connector 2′ for providing a plane surface to be engaged by a vacuum suction device. The electrical connector 2′ comprises a housing 21′ received a plurality of terminals, a stiffener 22′ covered on the housing, a cover 24′ and a lever 25′ mounted on two sides on the housing 21′. The cover 24′ is a hollow frame and comprises a cavity 240′ in a center position thereof, a first bilateral side 241′, a second bilateral side 242′, a third bilateral side 243′ and a fourth bilateral side 244′ surrounding the cavity 240′. The pick up 3′ is a rectangular shape and defines a smooth sucking portion 33′ for being picked up by a vacuum suction device. The pick up 3′ defines a first end 31′ and a second end 32′ opposite to the first end 31′, a third end 37′ and a fourth end 38′ opposite to the third end 37′. The first end 31′ defines a first projection 312′ extending from a lateral side thereof and the second end 32′ defines a second projection 322′ extending from a lateral side thereof. The third end 37′ defines a pair of first hooks 372′ extending outwardly from two opposite lateral sides thereof and the fourth end 38′ defines a pair of second hooks 382′ extending outwardly from two opposite lateral sides thereof. In addition, the first end 31′ and the second end 32′ each define a pair of stop ribs 39′ extending from two sides of the projections thereof. When the pick up 3′ is assembled on the electrical connector 2′, each second hook of 382′ the pick up 3′ passes through the center opening 240′ of the cover 24′ and engages with an inner wall of the first lateral side 241′. Successively, the first hook 372′ is secured on an inner wall of the second lateral side 242′. At last, the stop rib 39′ of the pick up 3′ are inserted into the central opening 240′ and abuts against the inner wall of the third lateral side 243′ and the fourth lateral side 244′ respectively.
However, in above statement, the electrical connectors define hooks on the outer sides thereof, which are engaged with pick up caps in a rigid interferential engagement means. When the electrical connector assembly is assembled or disassembled, the force applied on the pick up cap and the electrical connector has to be greater than ever, which is prone to destroy the hooks of the pick up cap and the parts of the electrical connector. In addition, the greater shake during the assembling the pick up cap on the electrical connector can make an open electrical connection and a fail mechanical connection between terminals and leads of the chip module.
Thus, there is a need to provide a new land grid connector assembly that overcomes the above-mentioned problems.