Connector terminal and electric connector

1. A connector terminal comprising:

a contact portion that comes into contact with a counter connector terminal;

a hold portion that is held in a connector housing; and

a coupling portion that is disposed between the contact portion and the hold portion and couples the contact portion and the hold portion such that the contact portion and the hold portion are elastically displaceable relative to each other,

wherein the contact portion, the coupling portion and the hold portion are made of a single metal sheet,

wherein the coupling portion is configured as a first rectangular tube having four bending portions parallel to each other and has a single band portion that continuously extends while bending from the contact portion to the hold portion by having a plurality of notches staggered from the contact portion toward the hold portion, the plurality of notches being separated from each other,

wherein the first rectangular tube has a bottom plate potion, a first lateral wall portion, a ceiling portion and a second lateral wall portion which are adjacent to each other through corresponding one of the four bending portions, respectively, and the single band portion bends at the four bending portions to form the bottom plate portion, the first lateral wall portion, the ceiling portion and the second lateral wall portion,

wherein each of the plurality of notches has an opened entrance end and a closed tip end, and includes an oblique part that extends to cross the bottom plate portion in a direction oblique to the four bending portions and a perpendicular part that is connected to the oblique part and extends to cross one of the first lateral wall portion and the second lateral wall portion in a direction perpendicular to the four bending portions,

wherein the oblique part included in an odd numbered notch of the plurality of notches when counted from the contact portion is slanted in a direction from the contact portion toward the hold portion as approaching the closed tip end of the odd numbered notch from an entrance of the odd numbered notch, and

wherein the oblique part included in an even numbered notch of the plurality of notches when counted from the contact portion is slanted in a direction from the hold portion toward the contact portion as approaching the closed tip end of the even numbered notch from the opened entrance end of the even numbered notch.

2. The connector terminal according to claim 1 , wherein the oblique parts of the plurality of notches extend parallel to each other.

3. The connector terminal according to claim 1 , wherein the contact portion is configured as a second rectangular tube having four bending portions that separately extend from the four bending portions of the first rectangular tube constituting the coupling portion.

4. The connector terminal according to claim 1 , wherein the contact portion comes into contact with the counter connector terminal when the counter connector terminal in a flat plate shape having a top surface and a bottom surface is fitted with the connector terminal, and

wherein the contact portion includes:

one or more top side contact points each of which makes point contact with the top surface of the counter connector terminal; and

three or more bottom side contact points each of which makes point contact with the bottom surface of the counter connector terminal and which are not aligned in a straight line,

the one or more top side contact points do not coincide in position with any of the three or more bottom side contact points when viewed in a direction perpendicular to the top surface of the counter connector terminal in a fitted state, and

a position of a center of gravity as determined by arrangement positions of the one or more top side contact points coincides with a position of a center of gravity as determined by arrangement positions of the three or more bottom side contact points when viewed in the direction perpendicular to the top surface of the counter connector terminal in the fitted state.

5. The connector terminal according to claim 1 , wherein the hold portion has a press-fit projection for use in press-fitting into the connector housing.

6. The connector terminal according to claim 1 , wherein the hold portion has a screwing portion for use in securing to the connector housing by a screw.

7. An electric connector comprising:

the connector terminal according to claim 1 ; and

the connector housing holding the hold portion of the connector terminal.

8. A connector terminal comprising:

a contact portion that comes into contact with a counter connector terminal;

a hold portion that is held in a connector housing; and

a coupling portion that is disposed between the contact portion and the hold portion and couples the contact portion and the hold portion such that the contact portion and the hold portion are elastically displaceable relative to each other,

wherein the contact portion, the coupling portion and the hold portion are made of a single metal sheet,

wherein the coupling portion is configured as a first rectangular tube having four bending portions parallel to each other and has a single band portion that continuously extends while bending from the contact portion to the hold portion by having a plurality of notches staggered from the contact portion toward the hold portion,

wherein each of the plurality of notches includes an oblique part that extends to cross over adjacent two of the four bending portions in a direction oblique to the four bending portions and a perpendicular part that is connected to the oblique part and extends in a direction perpendicular to the four bending portions, the oblique parts of the plurality of notches extend parallel to each other,

wherein the oblique part included in an odd numbered notch of the plurality of notches when counted from the contact portion is slanted in a direction from the contact portion toward the hold portion as approaching the closed tip end of the odd numbered notch from an entrance of the odd numbered notch, and

wherein the oblique part included in an even numbered notch of the plurality of notches when counted from the contact portion is slanted in a direction from the hold portion toward the contact portion as approaching the closed tip end of the even numbered notch from the opened entrance end of the even numbered notch.

9. A connector terminal comprising:

a contact portion that comes into contact with a counter connector terminal;

a hold portion that is held in a connector housing; and

a coupling portion that is disposed between the contact portion and the hold portion and couples the contact portion and the hold portion such that the contact portion and the hold portion are elastically displaceable relative to each other,

wherein the contact portion, the coupling portion and the hold portion are made of a single metal sheet,

wherein the coupling portion is configured as a first rectangular tube having four bending portions parallel to each other and has a single band portion that continuously extends while bending from the contact portion to the hold portion by having a plurality of notches staggered from the contact portion toward the hold portion,

wherein the contact portion is configured as a second rectangular tube having four bending portions that separately extend from the four bending portions of the first rectangular tube constituting the coupling portion,

wherein each of the plurality of notches includes an oblique part that extends to cross over adjacent two of the four bending portions in a direction oblique to the four bending portions and a perpendicular part that is connected to the oblique part and extends in a direction perpendicular to the four bending portions,

wherein the oblique part included in an odd numbered notch of the plurality of notches when counted from the contact portion is slanted in a direction from the contact portion toward the hold portion as approaching the closed tip end of the odd numbered notch from an entrance of the odd numbered notch, and

wherein the oblique part included in an even numbered notch of the plurality of notches when counted from the contact portion is slanted in a direction from the hold portion toward the contact portion as approaching the closed tip end of the even numbered notch from the opened entrance end of the even numbered notch.