Abstract: An optical disk apparatus includes: a servo controller, operable to carry out a servo control of tracking of an optical pickup based on a tracking error signal; a TE balance regulator, operable to detect a TE balance correction value for equalizing, with a reference voltage, a central voltage of the tracking error signal when a beam spot of the optical pickup crosses a track; a detrack regulator, operable to detect a detrack correction value for causing signal quality of an output of the optical pickup to be the highest; and a TE offset corrector, operable to set an offset voltage, which is to be added to the tracking error signal, to be the TE balance correction value when a difference between the TE balance correction value and the detrack correction value is smaller than a predetermined value, and to set the offset voltage to be a value between the TE balance correction value and the detrack correction value when the difference is greater than the predetermined value.

Abstract: An optical disk device includes a pickup head, a thread motor, and a drive controller, and a thread drive IC. The drive controller supplies directed voltage to the thread drive IC. The thread drive IC in response supplies drive voltage to the thread motor, which moves the pickup based on the drive voltage from the thread drive IC. The drive controller directs to the thread drive IC supply of first directed voltage. The thread drive IC supplies first supplied voltage to the thread motor in response to the directive from the drive controller to supply the first directed voltage. The drive controller detects the first supplied voltage and calculates a correction value based on the detected first supplied voltage. The drive controller corrects the directed voltage with the correction value and then directs to the thread drive IC supply of a corrected drive voltage.

Abstract: A disc apparatus which can judge accurately whether or not a spindle motor is at fault due to a short circuit is provided. A disc apparatus (1) includes a spindle motor (3) which rotates a disc (2), a differential operational amplifier (5) which successively detects output voltages of the spindle motor (3), and a failure judgment unit (10) which calculates an average voltage of the plural output voltages and judges whether or not the spindle motor (3) is at fault in accordance with the average voltage and the output voltages. When counting number of occurrences of a specific state which indicates that one of the two output voltages detected successively is larger than the average voltage and other of the two output voltages is smaller than the average voltage, the failure judgment unit (10) judges that the spindle motor (3) is at fault.

Abstract: An objective lens is raised from below upwards with a DVD laser diode turned on and levels of detection signals A, B, C, and D from a four segment photodetector are acquired and stored in a RAM. A ratio (A+D)/(B+C) in a direction of the X-axis is then calculated. When the ratio exceeds a predetermined value, a lens shift correction amount is calculated for the calculated ratio based on a correction table. The objective lens is then shifted in the direction of the X-axis in accordance with the calculated lens shift correction amount. These processes are executed before a series of processes required for achieving a focus-on state.

Abstract: An optical pickup has a photo detector which is divided into first, second, third and fourth quadrants, receives a laser beam reflected from an optical disc via an objective lens, and outputs first, second, third and fourth detection signals from the respective quadrants. A system controller controls a memory to store levels (A, B, C and D) of the first, second, third and fourth detection signals after a focus servo section performs a focus operation by shifting the objective lens in a direction perpendicular to the optical disc surface, and then, calculates a ratio of ((A+D)/(B+C)) in a radial direction of the optical disc. The system controller controls the tracking servo section to perform a tracking operation to shift the objective lens in the radial direction based on a correction table which represents a relationship between correction amount of the lens shift and the calculated ratio ((A+D)/(B+C)).

Abstract: An optical disk apparatus includes: a servo control unit, operable to execute a servo control of focusing based on a focus error signal and to execute a servo control of tracking based on a tracking error signal; a detrack regulating unit, operable to execute a detrack regulation for setting an offset voltage, which is to be added to the tracking error signal, to be a voltage for giving the highest signal quality of an output of an optical pickup; and a defocus regulating unit, operable to execute a defocus regulation for setting an offset voltage, which is to be added to the focus error signal, to be a voltage for giving the highest signal quality of the output of the optical pickup. The defocus regulation is executed in a state in which the servo control of the focusing and the servo control of the tracking are executed. The defocus regulation is executed after the detrack regulation is executed, in the state in which the servo control of the focusing and the servo control of the tracking are executed.

Abstract: An optical disk apparatus includes: a servo controller, operable to carry out a servo control of tracking of an optical pickup based on a tracking error signal; a TE balance regulator, operable to detect a TE balance correction value for equalizing, with a reference voltage, a central voltage of the tracking error signal when a beam spot of the optical pickup crosses a track; a detrack regulator, operable to detect a detrack correction value for causing signal quality of an output of the optical pickup to be the highest; and a TE offset corrector, operable to set an offset voltage, which is to be added to the tracking error signal, to be the TE balance correction value when a difference between the TE balance correction value and the detrack correction value is smaller than a predetermined value, and to set the offset voltage to be a value between the TE balance correction value and the detrack correction value when the difference is greater than the predetermined value.

Abstract: An optical disk device includes a pickup head, a thread motor, and a drive controller, and a thread drive IC. The drive controller supplies directed voltage to the thread drive IC. The thread drive IC in response supplies drive voltage to the thread motor, which moves the pickup based on the drive voltage from the thread drive IC. The drive controller directs to the thread drive IC supply of first directed voltage. The thread drive IC supplies first supplied voltage to the thread motor in response to the directive from the drive controller to supply the first directed voltage. The drive controller detects the first supplied voltage and calculates a correction value based on the detected first supplied voltage. The drive controller corrects the directed voltage with the correction value and then directs to the thread drive IC supply of a corrected drive voltage.

Abstract: A control part that controls the device entirety based on an instruction inputted from the operation part has a rezero operation function in that, when an optical pickup reaches the innermost circumferential position of a disk, the control part supplies a thread motor of a thread drive mechanism for moving the optical pickup with a thread drive voltage set to a voltage value and a supply period necessary for moving the optical pickup for a rezero feed distance from a thread drive circuit, whereby moving the pickup 4 toward the disk outer circumferential side, and when the supply period elapses from the point of starting movement of the optical pickup toward the disk outer circumferential side, the control part supplies the thread motor with a rezero brake pulse voltage of 2V through 3V for 17 msec through 25 msec.