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The present invention provides a card edge connector as a high-speed differential signal connector configured to equalize electric potentials of ground contacts adjacent to signal line contacts, and thus to reduce crosstalk between adjacent signal line contacts. The card edge connector serves as a f

The present invention provides a card edge connector as a high-speed differential signal connector configured to equalize electric potentials of ground contacts adjacent to signal line contacts, and thus to reduce crosstalk between adjacent signal line contacts. The card edge connector serves as a female connector in which multiple signal line contacts and multiple ground contacts are arranged in parallel in at least one row. In the card edge connector, the signal line contacts and the ground contacts are arranged in a way that every two signal line contacts for high-speed signals to send and return respectively therethrough are interposed between two ground contacts, and all of the multiple ground contacts arranged in the one row are electrically connected to one another by use of a common contact.

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1. A card edge connector serving as a female connector, said card edge connector comprising: a plurality of signal line contacts; anda plurality of ground contacts that are arranged in parallel in at least one row, whereineach of said plurality of signal line contacts includes a contact point portio

1. A card edge connector serving as a female connector, said card edge connector comprising: a plurality of signal line contacts; anda plurality of ground contacts that are arranged in parallel in at least one row, whereineach of said plurality of signal line contacts includes a contact point portion adapted to contact an external contact point of a male connector at a desired contact pressure, an elastically deformable portion adapted to impart the desired contact pressure to the contact point portion, a fixing portion being held on the card edge connector, and a terminal portion being connectable to an external contact point of a printed wiring board on which the card edge connector is mounted,each of said plurality of ground contacts includes a contact point portion adapted to contact an external contact point of a male connector at a desired contact pressure, an elastically deformable portion adapted to impart the desired contact pressure to the contact point portion, a fixing portion being held on the card edge connector, and a terminal portion being connectable to an external contact point of a printed wiring board on which the card edge connector is mounted,the signal line contacts and the ground contacts are arranged in a way that every two signal line contacts for high-speed signals to send and return respectively there through are interposed between two grounds contacts, andall of the plurality of ground contacts arranged in the one row are electrically connected on one another through said fixing portions of said plurality of ground contacts by use of a plurality of common contacts,each of said plurality of common contacts includes a flat main body and two leg portions which are formed by bending right and left end portions of the flat main body, andeach of said two leg portions is formed with two clamping portions clamping corresponding fixing portions of two ground contacts such as to electrically connect said two ground contacts between which the two signal line contacts are interposed. 2. The card edge connector according to claim 1, wherein each common contact is made of a metal thin plate. 3. A card edge connector serving as a female connector, said card edge connector comprising: a plurality of signal line contacts; anda plurality of ground contacts that are arranged in parallel in at least one row, whereineach of said plurality of signal line contacts includes a contact point portion adapted to contact an external contact point of a male connector at a desired contact pressure, an elastically deformable portion adapted to impart the desired contact pressure to the contact point portion, a fixing portion being held on the card edge connector, and a terminal portion being connectable to an external contact point of a printed wiring board on which the card edge connector is mounted,each of said plurality of ground contacts includes a contact point portion adapted to contact an external contact point of a male connector at a desired contact pressure, an elastically deformable portion adapted to impart the desired contact pressure to the contact point portion, a fixing portion being held on the card edge connector, and a terminal portion being connectable to an external contact point of a printed wiring board on which the card edge connector is mounted,the signal line contacts and the ground contacts are arranged in a way that every two signal line contacts for high-speed signals to send and return respectively there through are interposed between two ground contacts,a common contact is configured to be capable of electrically simultaneously connecting the plurality of ground contacts to one another,all of the plurality of ground contacts arranged in the one row are electrically connected to one another through said fixing portions of said plurality of ground contacts by use of said common contact,said card edge connector further comprises a holder configured to hold said common contact, andeach said fixing portion of said plurality of signal line contacts and each said fixing portion of said plurality of ground contacts include a holder receiving recessed portion to which the holder is attachable. 4. The card edge connector according to claim 3, wherein the common contact is made of a metal thin plate.