Optical disk apparatus and method for adjusting tilt based on optical disk type

Abstract

An optical disk apparatus configured to be compatible with a plurality of disk types includes an objective lens to focus a laser beam onto an optical disk provided in the apparatus. A drive mechanism is coupled to the objective lens to enable tilting of the objective lens to a plurality of tilt angles. A first signal detection circuit is configured to receive and process a first information signal associated with information read from the optical disk and to output a data signal derived from the first information signal. A second signal detection circuit is configured to receive and process a second information signal associated with information read from the optical disk and to generate a first track error signal. A third signal detection circuit is configured to receive and process a third information signal associated with information read from the optical disk and to generate a second track error signal. A digital signal processor is coupled to the first, second, and third signal detection circuits and is configured to determine a disk type of the optical disk and perform a first tilting technique on the lens if the optical disk is determined to be a first disk type, a second tilting technique on the lens if the optical disk determined to be a second disk type, and a third tilting technique if the optical disk is determined to be a third disk type.