Patent ID: 8780680
Filing Date: 2014-07-15
Classification: G11B

Abstract:
1. An optical disc device which can record and reproduce information by irradiating a face of an optical disc with laser light from an objective lens and perform label printing by irradiating the other face of the optical disc with the laser light from the objective lens, comprising: a circuit for forming a focus error signal for a focus servo based on a reflection light from the optical disc exposed to the laser light; and a data processing unit which can feedback-control a position to which the objective lens is moved by a focusing actuator, based on the focus error signal, wherein the data processing unit includes: wherein the optical disc device further comprises: wherein when performing the label printing, the data processing unit feedforward-controls a position to which the objective lens is moved by the focusing actuator based on the control data for the label printing which is stored in a memory circuit as digital data and converted to an analog signal with the digital-to-analog conversion circuit, wherein when performing the feedforward control, the data processing unit switches and controls a gain of the driver circuit so as to become smaller than the gain of the driver circuit in the feedback control.