Side-stiffened flexural pantographic mount for positioning a magnetic

Abstract

A flexural pantographic mount for use in a helical scan magnetic tape transport employing a closed loop servo system having a specified frequency bandwidth is disclosed. The mount includes a fixed body and a moveable body such as a magnetic transducing head assembly. First and second parallel spaced apart elongated flexible yet similar leaves have opposite ends, opposite edges and uniform thickness. The leaves are of similar material. One set of the opposite ends of the leaves are connected to the fixed body, the other set of opposite ends being connected to the moveable body. The leaves, when the moveable body assembly is subjected to a force having a component F perpendicular to the planes of the leaves, is flexed into an 'S' shape with the moveable assembly undergoing a deflection D. Each leaf exhibits its primary mode stiffness K equal to the ratio F/D. The leaves also exhibit shapes defining secondary and even higher order natural mode vibrations with higher order frequencies falling beyond the servo system bandwidth. First and second edge extension, or side stiffening, strips of similar material are integral with the opposite edges of each corresponding leaf and form a side along the edge of the leaf. The integration of edge stiffener with its leaf occurs without altering the thickness of either edge or leaf so as to maintain the value of the primary mode stiffness as a substantially unaltered value while at the same time the frequencies of the higher order natural mode vibrations are raised to values substantially greater than the specified bandwidth of the closed loop system.