Patent ID: 7154711
Filing Date: 2006-12-26
Classification: G11B

Abstract:
1. An information recording apparatus comprising: an actuator which has a head arm for 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 substance which is revolvably pivotally supported and interlocks at all times with the swing of said actuator in load and unload directions, 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; and a revolution regulating mechanism for regulating a revolution range of said inertia substance in order to regulate such an excessive swing of said actuator that when said actuator is in a state of being loaded to said recording medium, due to an excessive operation of said actuator, said head is moved to outside of a data area of said recording medium, and further moved in a direction away from said data area, wherein said revolution regulating mechanism for said inertia substance is a fixed portion in an enclosure, and a notch portion engaging with the fixed portion is formed on a peripheral surface of said inertia substance.