Connector

1 . A connector comprising:

a plug contact having a conductive property, having a tubular shape, and including a recessed portion extending along a fitting axis; and

an inner contact constituted of a projection that is inserted in the recessed portion and has an outer peripheral surface entirely covered with a conductive layer,

wherein the inner contact has contacting portions making contact with the plug contact within the recessed portion and pressing portions situated in a rotational position different from the contacting portions about the fitting axis, and

a part of a connection object of sheet type having a flexible conductor exposed on at least one surface of the connection object is sandwiched between the pressing portions and an inner surface of the recessed portion in a direction perpendicular to the fitting axis, the inner surface of the recessed portion makes contact with a top surface of the connection object, and the pressing portions make contact with a bottom surface of the connection object, whereby the plug contact is electrically connected to the flexible conductor directly when the flexible conductor is exposed on the top surface of the connection object, and the plug contact is electrically connected to the flexible conductor via the inner contact when the flexible conductor is exposed on the bottom surface of the connection object,

wherein the projection includes:

two first protrusion portions arranged on opposite sides across the fitting axis, the two first protrusion portions protruding in directions perpendicular to the fitting axis; and

four second protrusion portions disposed at 90-degree intervals about the fitting axis and each spaced from an adjacent one of the two first protrusion portions at a 45-degree interval about the fitting axis, the four second protrusion portions protruding in directions perpendicular to the fitting axis,

the conductive layer covering a tip of each of the two first protrusion portions forms each of the contacting portions, and

the conductive layer covering a tip of each of the four second protrusion portions forms each of the pressing portions.

2 . The connector according to claim 1 ,

wherein a first distance from the fitting axis to each of the contacting portions is larger than a second distance from the fitting axis to each of the pressing portions in a direction perpendicular to the fitting axis.

3 . The connector according to claim 2 ,

wherein the first distance is slightly larger than a radius of the recessed portion, and

the second distance is slightly larger than a value obtained by subtracting a thickness of the connection object from the radius of the recessed portion.

4 . The connector according to claim 1 ,

wherein the plug contact includes a tubular portion and a flange formed at one end of the tubular portion, and

the recessed portion is formed from an interior of the tubular portion.

5 . The connector according to claim 4 , comprising a housing having an insulating property and configured to retain the connection object and the plug contact,

wherein the housing includes:

a top insulator provided with a contact through-hole through which the tubular portion of the plug contact passes and which is smaller than the flange; and

a bottom insulator provided with the inner contact, and

the top insulator is fixed to the bottom insulator such that the tubular portion of the plug contact passes through the contact through-hole and the connection object and the flange are sandwiched between the top insulator and the bottom insulator.

6 . A connector comprising:

a plug contact having a conductive property, having a tubular shape, and including a recessed portion extending along a fitting axis; and

an inner contact constituted of a projection that is inserted in the recessed portion and has an outer peripheral surface entirely covered with a conductive layer,

wherein the inner contact has contacting portions making contact with the plug contact within the recessed portion and pressing portions situated in a rotational position different from the contacting portions about the fitting axis, and

a part of a connection object of sheet type having a flexible conductor exposed on at least one surface of the connection object is sandwiched between the pressing portions and an inner surface of the recessed portion in a direction perpendicular to the fitting axis, the inner surface of the recessed portion makes contact with a top surface of the connection object, and the pressing portions make contact with a bottom surface of the connection object, whereby the plug contact is electrically connected to the flexible conductor directly when the flexible conductor is exposed on the top surface of the connection object, and the plug contact is electrically connected to the flexible conductor via the inner contact when the flexible conductor is exposed on the bottom surface of the connection object,

wherein the projection includes:

four first protrusion portions disposed at 90-degree intervals about the fitting axis, the four first protrusion portions protruding in directions perpendicular to the fitting axis; and

four second protrusion portions disposed at 90-degree intervals about the fitting axis and each spaced from an adjacent one of the four first protrusion portions at a 45-degree interval about the fitting axis, the four second protrusion portions protruding in directions perpendicular to the fitting axis,

the conductive layer covering a tip of each of the four first protrusion portions forms each of the contacting portions, and

the conductive layer covering a tip of each of the four second protrusion portions forms each of the pressing portions.

7 . A connector comprising:

a plug contact having a conductive property, having a tubular shape, and including a recessed portion extending along a fitting axis; and

an inner contact constituted of a projection that is inserted in the recessed portion and has an outer peripheral surface entirely covered with a conductive layer,

wherein the inner contact has contacting portions making contact with the plug contact within the recessed portion and pressing portions situated in a rotational position different from the contacting portions about the fitting axis, and

a part of a connection object of sheet type having a flexible conductor exposed on at least one surface of the connection object is sandwiched between the pressing portions and an inner surface of the recessed portion in a direction perpendicular to the fitting axis, the inner surface of the recessed portion makes contact with a top surface of the connection object, and the pressing portions make contact with a bottom surface of the connection object, whereby the plug contact is electrically connected to the flexible conductor directly when the flexible conductor is exposed on the top surface of the connection object, and the plug contact is electrically connected to the flexible conductor via the inner contact when the flexible conductor is exposed on the bottom surface of the connection object,

wherein the projection includes:

three first protrusion portions disposed at 120-degree intervals about the fitting axis, the three first protrusion portions protruding in directions perpendicular to the fitting axis; and

three second protrusion portions disposed at 120-degree intervals about the fitting axis and each spaced from an adjacent one of the three first protrusion portions at a 60-degree interval about the fitting axis, the three second protrusion portions protruding in directions perpendicular to the fitting axis,

the conductive layer covering a tip of each of the three first protrusion portions forms each of the contacting portions, and

the conductive layer covering a tip of each of the three second protrusion portions forms each of the pressing portions.