PURPOSE: A track ball of an ultrasound diagnosis device is provided to allow a user to fee the rotating speed and direction of a track ball because projections or recesses are formed on the surface of the track ball.CONSTITUTION: A ball(111) has a spherical surface which is partially exposed out of a control panel having function keys. Recesses(112) are formed at regular intervals on the ball. A first sensor(120) contacts the ball and allowed to rotate around a first rotary shaft(121). A second sensor(130) contacts the ball and allowed to rotate around a second rotary shaft(131) perpendicular to the first rotary shaft. The rotating direction and speed of the ball are sensed by the rotation of the first and second sensors. The ball has two rotating components that are parallel to the first and second rotary shafts, respectively. The rotating speed of the first and second sensors are determined by the speed components of the ball, which are divided into two directions parallel to the first and second rotary shafts.COPYRIGHT KIPO 2012본 발명은 회전시 작동감을 향상시키고, 디스플레이부의 커서 등을 정밀하게 제어할 수 있는 초음파 진단기기의 트랙볼에 관한 것이다. 본 발명에 따른 초음파 진단장치의 트랙볼은, 표면에 복수개의 홈을 갖는 볼과 상기 볼의 회전 방향 및 속도를 감지하는 센서와 상기 센서에서 감지된 상기 볼의 회전 방향 및 속도를 이용하여 초음파 진단장치의 디스플레이부를 제어하는 제어부를 포함한다.
