Patent ID: 7046593

Claim:
An optical disk apparatus configured to be compatible with a plurality of disk types, the apparatus comprising: an objective lens to focus a laser beam onto an optical disk provided in the apparatus; a drive mechanism coupled to the objective lens to enable tilting of the objective lens to a plurality of tilt angles; a first signal detection circuit being 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 being configured to receive and process a second information signal associated with information read from the optical disk and to generate a push-pull track error signal and a wobble signal; a third signal detection circuit being configured to receive and process a third information signal associated with information read from the optical disk and to generate a differential phase track error signal; and a digital signal processor to determine a disk type and to perform tilt control of the objective lens to increase the signal strength of the wobble signal derived from the optical disk during a recording operation if the optical disk is determined to be a DVD-R or DVD-RW disk that does not include data written in an information recording area of the optical disk by a user.