Patent ID: 6278673
Filing Date: 2001-08-21
Classification: G11B

Abstract:
An apparatus for recording and/or reproducing information on and/or from an optical record disk, said apparatus comprising:an optical head including a semiconductor laser for emitting a laser beam, an objective lens for projecting said laser beam emitted by said semiconductor laser onto said optical record disk, and a photo-detecting means for receiving a return laser beam reflected by said optical record disk to produce an information signal;a rotating means including a rotatable member arranged to be rotatable about an imaginary straight line which is perpendicular to an imaginary plane substantially in parallel with a plane of said optical record disk, said rotatable member having an inclined portion which extends substantially about said imaginary straight line;a movable member arranged movably between a first position and a second position relative to said imaginary plane of said optical record disk, and including a projection which extends in a direction substantially in parallel with said imaginary plane of said optical record disk and is brought into contact with said inclined portion of the rotatable member;a driving means including a turntable secured to said movable member and supporting said optical record disk, and a spindle motor having a driving shaft coupled with said turntable for rotating said turntable together with said optical record disk;an optical head driving means for driving at least said objective lens in a radial direction of said optical record disk;a position detecting means for detecting a position of said movable member to derive a position signal which is changed in accordance with the movement of said movable member to detect a condition that said rotatable member has been driven into said first position; anda control means for initiating a rotation of said spindle motor after said position signal has been changed.