Neck pillow

A neck pillow, comprising:

• a cushion portion configured to be worn on a neck of a user;
• an electro-liquid driving unit including a plurality of positive electrodes and a plurality of negative electrodes,
• wherein the electro-liquid driving unit is mounted into the cushion portion, bent in a shape of an arc configured to be a shape of the neck to surround the neck, and including ferroelectric particles, each having an electrorheological property, and nonconductive liquid, wherein the ferroelectric particles and the nonconductive liquid are fixed in one space, and
• wherein the electro-liquid driving unit is configured to generate vibration by contraction and expansion that are repeated when an arrangement of the ferroelectric particles and the nonconductive liquid is changed according to whether drive current is applied;
• a low voltage power supply configured to supply low voltage electricity necessary to drive the electro-liquid driving unit;
• and
• a high voltage control circuit unit including a processor and configured to convert low voltage direct current of the low voltage power supply into high voltage direct current and to supply the drive current to the electro-liquid driving unit, and to allow or block a flow of current to generate target vibration in the electro-liquid driving unit;
• wherein the electro-liquid driving unit includes:
• a liquid bag with the ferroelectric particles, each having the electrorheological property, and the nonconductive liquid being mixed in one space in the liquid bag;
• the plurality of positive electrodes installed to be brought into contact with a first surface of the liquid bag and arranged at a predetermined distance away from each other along a longitudinal direction of the liquid bag;
• the plurality of negative electrodes installed to be brought into contact with a second surface of the liquid bag while facing the plurality of positive electrodes, respectively;
• a plurality of springs installed on the plurality of negative electrodes, respectively, for support thereof, being pressed and decreasing in length when current is supplied to the plurality of positive electrodes and the plurality of negative electrodes and thus an electric field is applied, and being released and returning to an original length thereof when the electric field is no longer applied, with the repeated pressing and releasing of the spring causing the liquid bag to repeatedly contract and expand;
• a positive electrode lead line connecting the plurality of positive electrodes to the high voltage control circuit unit;
• and
• a negative electrode lead line connecting the plurality of negative electrodes to the high voltage control circuit unit.