Patent ID: 8290563

Claim:
An active dry sensor module comprising: a hollow main body having an upper surface with an insertion hole formed through the upper surface; a holder fixably inserted into the insertion hole of the hollow main body, the holder including holder screw threads and screw hollows; a cap with a hole and a lower part with cap screw threads and screw hollows, the cap inserted into the holder and interlocking with the holder by the holder screw threads and screw hollows mating with the cap screw threads and screw hollows; an active electrode inserted into the hole of the cap so that the active electrode is slidable relative to the cap, the active electrode having a contactable upper surface and a latching protrusion protruded from a lower part of the active electrode that is capable of being latched onto a lower end of the cap, wherein the active electrode having the contactable upper surface is slidable relative to the cap for directly contacting a portion of a scalp of a user that is using the active dry sensor module, wherein the active electrode has a cap shape that is capable of contacting a skin surface of a user, and wherein a height of the active electrode protruding from the cap is adjusted by rotating the cap inserted in the holder; a resilient member with a first end contacting the lower part of the active electrode, installed in the main body, and electrically connected to the main body; and an amplification circuit, installed in the main body and coupled to a second end of the resilient member, that is capable of receiving and processing a biomedical signal passed through the resilient member from the active electrode.