Neck device for absorbing shock and reducing vibration of legged mobile robot

A neck device for absorbing shock and reducing vibration of a legged mobile robot, the neck device comprising:

• a shock absorber fixed to a body portion of the legged mobile robot in which a plurality of leg portions support the body portion, the shock absorber being configured to absorb shock and vibration;
• a sensor platform coupled to a part of the shock absorber, the sensor platform comprising a camera and an inertial measurement unit;
• and
• a variable dynamic vibration absorber mounted on the sensor platform, the variable dynamic vibration absorber being configured to adjust an absorption frequency of shock and vibration caused by a movement of the legged mobile robot,
• wherein the shock absorber and the variable dynamic vibration absorber are configured to reduce shock and vibration transmitted to the sensor platform, so as to reduce movement and rotation of the sensor platform, and
• wherein the variable dynamic vibration absorber comprises:
• an actuator coupled to the sensor platform;
• a torsion spring configured to be rotated by an operation of the actuator;
• a guide connected to the torsion spring and configured to be rotated;
• and
• a linear stepping motor configured to be moved along the guide.