Magnetic disc apparatus having actuator for head positioning mechanism

A magnetic disc apparatus comprising:

• a recording medium in which a track constituted by a set of data is formed on a recording surface;
• a recording and reproducing element recording and reproducing the data on said track;
• a head supporting mechanism supporting a head provided with said recording and reproducing element;
• and
• an actuator constituted by a movable portion connected to said head supporting mechanism and a stationary portion fixed to a casing;
• wherein the magnetic disc apparatus is provided with a holding mechanism for holding the movable portion of said actuator driving said head supporting mechanism at a fixed position while an input command value is constant;
• and
• wherein said holding mechanism has two said actuators and is structured such that the respective actuators apply a drive force in a direction of keeping the head supporting mechanism at a fixed position.

A magnetic disc apparatus comprising:

• a recording medium in which a track constituted by a set of data is formed on a recording surface;
• a recording and reproducing element recording and reproducing the data on said track;
• a head supporting mechanism supporting a head provided with said recording and reproducing element;
• and
• an actuator constituted by a movable portion connected to said head supporting mechanism and a stationary portion fixed to a casing;
• wherein the magnetic disc apparatus is provided with a holding mechanism for holding the movable portion of said actuator driving said head supporting mechanism at a fixed position while an input command value is constant;
• and
• wherein said actuator includes a coarse moving actuator for coarsely moving said head supporting mechanism at a high speedand a fine moving actuator provided in said head supporting mechanism for finely moving said head so as to position said head.

A magnetic disc apparatus comprising:

• a magnetic disc provided with a recording surface for recording data;
• a magnetic head moving on said recording surface so as to record and reproduce the data;
• a magnetic head supporting mechanism supporting said magnetic head;
• and
• a coarse moving actuator connected to said magnetic head supporting mechanism and positioning the magnetic head to a predetermined position,
• wherein said actuator is provided with two drive portions for driving said magnetic head supporting mechanism in a rotational direction and a reverse-rotational direction of said magnetic disc, said drive portion is constituted by a stationary element fixed to a casing of the disc apparatus and provided with a plurality of teeth and a movable element provided in a magnetic head supporting mechanism side and having a plurality of teeth so as to oppose to the teeth of said stationary element, and said magnetic head supporting mechanism is moved and held at a fixed position by applying a predetermined voltage to said movable element.