Video head driving unit with nonlinear leaf spring force

摘要

In a video head driving unit having a rotary drum and a stationary drum, a horizontal yoke is secured to a leaf spring having a non-linear spring which is in turn connected to the rotary drum for rotation therewith. Video transducer heads are respectively mounted on the opposite ends of the yoke. The yoke is resiliently pivotally tiltable about an axis transverse thereto by an electromagnetic arrangement in response to a control signal so that the video heads are displaced in vertical position as they rotate with the rotary drum during "trick play mode". The leaf spring and yoke are so arranged that they are disengaged from each other at one of the diametrically opposite positions when the yoke is pivotally moved beyond a predetermined range of tilt angles, whereby the leaf spring exerts a non-linear spring force against the yoke to provide a higher tension to the yoke when same is pivotally moved within the range than when same is pivotally moved beyond the range.