Shock response analysis of optical disk drives considering main base and pick-up actuator using linear drop test and tilt drop test

The optical disk drive with more robustness against shock has been rarely studied. This research shows the shock response analysis of conventional optical disk drive. Main base of the optical disk drive is described with the motion of bouncing, pitching, and rolling. The entire model includes pick-up actuator. Finite element model of the entire system is made by ANSYS. And the lumped parameter model is made, which will replace the finite element model. Shock response of finite element model is compared with that of the lumped parameter model. Their shapes and magnitudes are the same. Therefore, the lumped parameter model can replace the finite element model. The lumped parameter model has advantages of cost and time over the finite element model. Linear drop test and tilt drop test are made in order to verify our shock model. Accelerometer is used for detecting input acceleration. Laser Doppler vibrometer is used for measuring the motion of the main base and pick-up actuator. Then experimental result is compared with the shock response of lumped parameter model. Their shapes are much the same. Therefore, the lumped parameter model of the optical disk drives can represent the real system.