Contact probe and probe unit

摘要

A contact probe includes a conductive first plunger including, on a same axis, a distal end portion, a flange portion, a boss portion, and a base end portion, a conductive second plunger including, on the same axis, a second distal end portion and a boss portion, and a coil spring including a coarsely wound portion formed by winding at a predetermined pitch with an inner diameter equal to or larger than a diameter of the boss portion of the first plunger and a tightly wound portion formed by tightly winding with an inner diameter substantially equal to a diameter of the boss portion of the second plunger, so that the first plunger and the second plunger are connected to each other on the same axis.

主权项

1. A contact probe comprising:
a conductive first contact member comprising, on a same axis, a first distal end portion having a tapered distal end shape, a first flange portion extending from a base end side of the first distal end portion and having a diameter larger than a diameter of the first distal end portion, a first boss portion extending from an end portion of the first flange portion different from the side of the first flange portion which is connected to the first distal end portion and having a diameter smaller than a diameter of the first flange portion, and a first base end portion extending from an end portion of the first boss portion different from the side of the first base end portion which is connected to the first flange portion and having a diameter smaller than a diameter of the first boss portion; a conductive second contact member comprising, on the same axis, a second distal end portion having a tapered distal end shape and a second boss portion extending from a base end side of the second distal end portion and having a diameter substantially equal to a diameter of the first base end portion; and a coil spring comprising a coarsely wound portion formed by winding at a predetermined pitch with an inner diameter larger than the diameter of the first base end portion and a tightly wound portion formed by tightly winding with an inner diameter substantially equal to the diameter of the second boss portion, an end portion of the coarsely wound portion being installed in the first boss portion, an end portion of the tightly wound portion being installed in the second boss portion, so that the first and second contact members are connected to each other on the same axis, wherein the first base end portion contacts with the tightly wound portion when a load having a magnitude equal to or greater than a predetermined magnitude is applied in a direction in parallel to an axis line and at least approaching to the second contact member.