Patent ID: 6757139
Filing Date: 2004-06-29
Classification: G11B

Abstract:
An information recording apparatus comprising:an actuator which has a head arm holding a head for recording/reproducing to a recording medium and which loads and unloads said head arm to said recording medium by swinging; an inertia arm which is swingably pivotally supported and which generates a rotational moment in the same direction as that of a rotational moment generated by said actuator when subjected to an external shock; a shock transmitting portion on said actuator side and a shock transmitting portion on said inertia arm side which operate in such a manner that when said actuator is located at a shunt position, said actuator and said inertia arm transmit shock rotational forces by mutual action/reaction, and the shock rotational force on the actuator side and the shock rotational force on the inertia arm side compete with each other at a point at which the shock rotational forces are transmitted; a rotational force transmitting portion on said actuator side and a rotational force receiving portion on said inertia arm side which operate in such a manner that the swing rotational force of the excessive swing of said actuator is transmitted to said inertia arm in order to regulate such an excessive swing of said actuator that said head is moved outside of a data area of said recording medium and further moved in a direction away from said data area, when said actuator is in a state of being loaded to said recording medium; and a swing regulating mechanism for regulating the swing exceeding a predetermined extent of said inertia arm which is subjected to the swing rotational force at said rotational force receiving portion.