Patent ID: 8934323
Filing Date: 2015-01-13
Classification: G11B

Abstract:
1. An optical disc device for reading information recorded on an optical disc medium under an operation condition corresponding to a value set with respect to a predetermined control parameter, the optical disc device comprising: a correction portion for correcting the value of the predetermined control parameter by repeatedly executing, while an operation of reading the information from the optical disc medium is being performed, a process of: acquiring, with respect to each of two values of the predetermined control parameter, a plurality of evaluation values of a same kind, each evaluation value indicating accuracy of the reading of the information from the optical disc medium, where one of the two values is to one side of the of the predetermined control parameter by a predetermined amount and the other of the two values is to an opposite side of the predetermined control parameter by the predetermined amount; updating the value of the predetermined control parameter in a direction towards the one side or the opposite side based on comparing the plurality of the evaluation values acquired for each of the two values of the predetermined control parameter; and setting a variable which indicates the direction toward which the predetermined control parameter was updated, wherein the correction portion executes seek control in response to an information reading command from a host, and subsequently and periodically carries out the acquiring, updating, and setting process to update the value of the predetermined control parameter, with reference to the variable, in parallel with reading the information from the optical disc medium.