Electrical connector and electronic device

1. An electrical connector which can engage with a corresponding connector inserted from a tip side thereof, comprising:

an insulating housing;

a first contact group constituted of a plurality of contacts linearly extending along an insertion and extraction direction of the corresponding connector and held by the housing so as to be arranged on a first contact plane;

a second contact group constituted of a plurality of contacts linearly extending along the insertion and extraction direction of the corresponding connector and held by the housing so as to be arranged on a second contact plane facing the first contact plane; and

a ground plate held by the housing so as to be located on a ground plane facing the first contact plane and the second contact plane between the first contact plane and the second contact plane,

wherein each of the contacts of the first contact group and the second contact group has a contacting portion which is located on the tip side and to be contacted with the corresponding connector, a horizontally extending portion horizontally extending from the contacting portion toward a base side, a downwardly extending portion downwardly extending from the horizontally extending portion and a terminal portion extending from the downwardly extending portion toward the base side,

wherein the ground plate is located between the horizontally extending portions of the contacts of the first contact group and the horizontally extending portions, the downwardly extending portions and the terminal portions of the contacts of the second contact group in addition to between the contacting portions and the horizontally extending portions of the contacts of the first contact group and the contacting portions and the horizontally extending portions of the contacts of the second contact group,

wherein the ground plate contains:

a first ground plate piece located between the contacting portions and the horizontally extending portions of the contacts of the first contact group and the contacting portions and the horizontally extending portions of the contacts of the second contact group, and

a second ground plate piece located between the horizontally extending portions of the contacts of the first contact group and the horizontally extending portions, the downwardly extending portions and the terminal portions of the contacts of the second contact group,

wherein the second ground plate piece is separated from the first ground plate piece, and

wherein the second ground plate piece and the first ground plate piece are not electrically connected to each other directly.

2. The electrical connector as claimed in claim 1 , wherein the second ground plate piece further extends so as to be located between the downwardly extending portions of the contacts of the first contact group and the downwardly extending portions and the terminal portions of the contacts of the second contact group.

3. The electrical connector as claimed in claim 1 , further comprising a shield member located outside the housing, and

wherein the second ground plate piece is electrically connected to the shield member.

4. The electrical connector as claimed in claim 1 , wherein the housing contains a top housing for holding the first contact group and the second ground plate piece and a bottom housing for holding the second contact group and the first ground plate piece.

5. The electrical connector as claimed in claim 4 , wherein the second ground plate piece includes a flat plate-like body portion and a pair of protruding portions formed on both end portions of the body portion in a width direction of the body portion perpendicular to the insertion and extraction direction of the corresponding connector so as to upwardly extend from the body portion,

wherein the top housing has a pair of press-fitting grooves, and

wherein the second ground plate piece is fixed to the top housing by respectively press-fitting the pair of protruding portions of the second ground plate piece into the pair of press-fitting grooves of the top housing.

6. An electronic device comprising:

a housing;

a circuit board provided in the housing; and

the electrical connector defined by claim 1 , which is mounted on the circuit board.

7. An electrical connector which can engage with a corresponding connector inserted from a tip side thereof, comprising:

an insulating housing;

a first contact group constituted of a plurality of contacts linearly extending along an insertion and extraction direction of the corresponding connector and held by the housing so as to be arranged on a first contact plane;

a second contact group constituted of a plurality of contacts linearly extending along the insertion and extraction direction of the corresponding connector and held by the housing so as to be arranged on a second contact plane facing the first contact plane; and

a ground plate held by the housing so as to be located on a ground plane facing the first contact plane and the second contact plane between the first contact plane and the second contact plane,

wherein each of the contacts of the first contact group and the second contact group has a contacting portion which is located on the tip side and to be contacted with the corresponding connector, a horizontally extending portion horizontally extending from the contacting portion toward a base side, a downwardly extending portion downwardly extending from the horizontally extending portion and a terminal portion extending from the downwardly extending portion toward the base side, and

wherein the ground plate contains:

a first ground plate piece located between the contacting portions and the horizontally extending portions of the contacts of the first contact group and the contacting portions and the horizontally extending portions of the contacts of the second contact group, and

a second ground plate piece located between the horizontally extending portions of the contacts of the first contact group and the horizontally extending portions, the downwardly extending portions and the terminal portions of the contacts of the second contact group, and

wherein the second ground plate piece is separated from the first ground plate piece so as not to contact with the first ground piece.

8. An electronic device comprising:

a housing;

a circuit board provided in the housing; and

the electrical connector defined by claim 7 , which is mounted on the circuit board.

9. An electrical connector which can engage with a corresponding connector inserted from a tip side thereof, comprising:

an insulating housing;

a first contact group constituted of a plurality of contacts linearly extending along an insertion and extraction direction of the corresponding connector and held by the housing so as to be arranged on a first contact plane;

a second contact group constituted of a plurality of contacts linearly extending along the insertion and extraction direction of the corresponding connector and held by the housing so as to be arranged on a second contact plane facing the first contact plane;

a first ground plate piece held by the housing so as to be located on a ground plane facing the first contact plane and the second contact plane between the first contact plane and the second contact plane, and

a second ground plate piece held by the housing so as to be separated from the first ground plate,

wherein each of the contacts of the first contact group and the second contact group has a contacting portion which is located on the tip side and to be contacted with the corresponding connector, a horizontally extending portion horizontally extending from the contacting portion toward a base side, a downwardly extending portion downwardly extending from the horizontally extending portion and a terminal portion extending from the downwardly extending portion toward the base side,

wherein the downwardly extending portions of the contacts of the first contact group are exposed toward an outside from the housing,

wherein the downwardly extending portions of the contacts of the second contact group are exposed toward the outside from the housing,

wherein the first ground plate piece is located between the contacting portions of the contacts of the first contact group and the contacting portions of the contacts of the second contact group, and

wherein the second ground plate piece is located between the downwardly extending portions of the contacts of the first contact group and the downwardly extending portions and the terminal portions of the contacts of the second contact group.

10. An electronic device comprising:

a housing;

a circuit board provided in the housing; and

the electrical connector defined by claim 9 , which is mounted on the circuit board.