| 摘要 |
PROBLEM TO BE SOLVED: To keep a detector sufficiently near a subject's head without causing any pain on the subject via a simple structure by applying the constitution that the position of headrest surface relative to a seat back is changeable along the subject's right and left direction. SOLUTION: A headrest 6 is coupled to a support member 11, so as to be rotatable around the axis 11a thereof. Also, a screw 13 inserted in the headrest 6 is pressed to the support member 11, thereby fixing the headrest 6 to the support member 11. The position of headrest surface 6a relative to a seat back 3b is made changeable along the right and left directions of a testee 2 via the rotation of the headrest 6 relative to the support member 11. As a result of the change of both the right and left positions of the headrest surface 6a, a head position for a detector 4 becomes adjustable along right and left directions without any need of a stuffing material between the headrest surface 6a and the head of the testee 2. |
