Patent ID: 6304543
Filing Date: 2001-10-16
Classification: G11B

Abstract:
An optical disk apparatus comprising:an optical head for writing and reading information to and from an optical disk while being opposed thereto;optical head moving means for moving the optical head in a radial direction of the optical disk;disk supporting and rotating means including:a pole-shaped portion extending along a rotation axis of the optical disk;a rotor unit which has a rotor magnet and rotates while supporting the optical disk; anda stator unit having a stator coil that is disposed in the vicinity of the rotor magnet,the rotor unit including first and second protrusions extending outward from the pole-shaped portion so as to form a recess in between, the first protrusion being a portion for supporting the optical disk while contacting with it, the second protrusion being a portion for accommodating the rotor magnet, and the recess being a space which the optical head goes into when it is moved to a position corresponding to an innermost portion of the optical disk, wherein a sum of a radius of the rotor magnet accommodating portion and a distance between a lens portion and an inner end of the optical head is larger than a radius of an outer border of a non-recording area of the optical disk.