Abstract: An impact energy absorbing apparatus includes: a base, an axial crush component, a top plate, and an energy transfer component. The base is fastened to a protected object, and a tapered hole is provided on a top surface of the base. A bottom end face of the metal hollow rod of the axial crush component is joined with the top surface of the base. The energy transfer component includes a force bearing plate and a guiding rod extending outwards, where the force bearing plate is superimposed on a top surface of the metal hollow rod, the guiding rod is inserted to a position corresponding to the tapered hole in the metal hollow rod, an outer diameter of the guiding rod is less than a greatest diameter of the tapered hole, an inner diameter of the guiding rod is greater than a smallest diameter of the tapered hole.

Abstract: A method for determining a bias voltage of a servo signal of an optical disc drive is disclosed. The method includes: generating a plurality of sensing signals via an optical sensor of the optical disc drive; generating a first and a second servo signals according to the sensing signals; adjusting the first and the second servo signals to generate a first and a second adjusted signal respectively; and determining the bias voltage of the servo signal according to the first and the second adjusted signals.

Abstract: A method for determining a bias voltage of a servo signal of an optical disc drive is disclosed. The method includes: generating a plurality of sensing signals via an optical sensor of the optical disc drive; generating a first and a second servo signals according to the sensing signals; adjusting the first and the second servo signals to generate a first and a second adjusted signal respectively; and determining the bias voltage of the servo signal according to the first and the second adjusted signals.