Optical disk apparatus and pickup control unit/method
View Patent ↗In an optical disk apparatus, when a focus deviation occurs, amplitude driving of a pickup is performed for focus pull-in immediately without a waiting time. The amplitude driving is performed with a first amplitude a given number of times, and when detection of a focusing point fails, amplitude driving with a second amplitude larger than the first amplitude is performed.
1. An optical disk apparatus comprising;
a pickup; and
a pull-in portion for performing pull-in operation for detecting a focusing point when a focus deviation occurs,
wherein, as the pull-in operation, the pull-in portion performs amplitude driving of the pickup with a first amplitude a given number of times, and, when the amplitude driving fails to detect a focusing point, performs amplitude driving of the pickup with a second amplitude larger than the first amplitude,
wherein the first amplitude is set at a value equal to or more than an own-weight hanging amount of a lens of the pickup arising if the optical disk apparatus is put in an upright position,
wherein the pull-in portion performs amplitude driving of the pickup with the first amplitude, with a first swing set in a direction opposite to an own-weight hanging direction of a lens of the pickup rising if the optical disk apparatus is put in an upright position.
2. A control unit for controlling driving of a pickup of an optical disk apparatus,
wherein when detecting occurrence of a focus deviation, the control unit instructs a driver of the pickup to perform amplitude driving of the pickup with a first amplitude a given number of times, and
when finding that detection of a focusing point fails as a result of the instruction, the control unit instructs the driver to perform amplitude driving of the pickup with a second amplitude larger than the first amplitude,
wherein the first amplitude is set at a value equal to or more than an own-weight hanging amount of a lens of the pickup arising if the optical disk apparatus is put in an upright position,
wherein the control unit instructs the driver to perform amplitude driving of the pickup with the first amplitude, with a first swing set in a direction opposite to an own-weight hanging direction of a lens of the pickup arising if the optical disk apparatus is put in an upright position.
3. A method for controlling driving of a pickup of an optical disk apparatus, comprising the steps of:
performing amplitude driving of the pickup with a first amplitude a given number of times when a focus deviation occurs; and
performing amplitude driving of the pickup with a second amplitude larger than the first amplitude when detection of a focusing point by the amplitude driving with the first amplitude fails,
wherein the first amplitude is set at a value equal to or more than an own-weight hanging amount of a lens of the pickup arising if the optical disk apparatus is put in an upright position,
wherein amplitude driving of the pickup with the first amplitude is performed, with a first swing set in a direction opposite to an own-weight hanging direction of a lens of the pickup arising if the optical disk apparatus is put in an upright position.