US 11,940,465 B2
Contact probe and signal transmission method
Kazuya Soma, Kanagawa (JP); Masahiro Takahashi, Kanagawa (JP); and Shuji Takahashi, Kanagawa (JP)
Assigned to NHK Spring Co., Ltd., Yokohama (JP)
Appl. No. 17/437,152
Filed by NHK Spring Co., Ltd., Yokohama (JP)
PCT Filed Mar. 12, 2020, PCT No. PCT/JP2020/010960
§ 371(c)(1), (2) Date Sep. 8, 2021,
PCT Pub. No. WO2020/184684, PCT Pub. Date Sep. 17, 2020.
Claims priority of application No. 2019-046149 (JP), filed on Mar. 13, 2019.
Prior Publication US 2022/0146552 A1, May 12, 2022
Int. Cl. G01R 1/073 (2006.01); H01R 12/71 (2011.01); H01R 13/24 (2006.01)
CPC G01R 1/07307 (2013.01) [H01R 13/2421 (2013.01); H01R 12/714 (2013.01); H01R 2201/20 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A contact probe for contacting with electrodes at both ends of a longitudinal length of the contact probe and transmitting a signal, the contact probe comprising:
a first plunger configured to contact a first electrode at one end of the longitudinal length;
a second plunger configured to contact a second electrode different from the first electrode at another end of the longitudinal length;
a coil spring connected to the first plunger at one end of the coil spring and connected to the second plunger at another end of the coil spring; and
a pipe provided inside the coil spring, wherein
the first plunger includes a first slide portion provided at another end of the first plunger opposite to the one end of the first plunger contacting the first electrode, the first slide portion being configured to slide along an inner periphery of the pipe,
the second plunger includes a second slide portion provided at another end of the second plunger opposite to the one end of the second plunger contacting the second electrode, the second slide portion being configured to slide along the inner periphery of the pipe, and
the coil spring includes:
a first attachment portion that is tightly wound, the first attachment portion being provided at the one end of the coil spring and attached to the first plunger;
a second attachment portion that is tightly wound, the second attachment portion being provided at the other end of the coil spring and attached to the second plunger;
a coarsely wound portion wound at preset pitches;
a first contact portion including one end connected to the first attachment portion and another end connected to the coarsely wound portion, the first contact portion contacting the pipe, the first contact portion being tightly wound in a natural state; and
a second contact portion including one end connected to the coarsely wound portion and another end connected to the second attachment portion, the second contact portion contacting the pipe, the second contact portion being tightly wound in the natural state.