Optical disk apparatus for detecting error readings of a track address in MCAV format

An optical disk apparatus using an optical disk medium having a plurality of circumferential tracks for reading or writing data from/onto the medium, said plurality of tracks being divided into a plurality of zones in the radial direction, the data being read out or written by using clock signals having frequency components which are different in every zone, wherein said apparatus comprises:

• optical head means for irradiating a light beam onto a selected track of said optical disk medium, thereby optically reading or writing the data;
• servo means for moving said optical head means to selected positions and controlling the position of the light beam from said optical head means with respect to said optical disk medium;
• frequency setting means for generating frequency information;
• clock generating means for generating a clock signal which is used for the reading/writing operations of the optical disk medium and for changing a component of the frequency of said clock signal by setting frequency information received from said frequency setting means;
• access means for recognizing a track address of the selected track from a track passing signal which is obtained due to the movement of said optical head means and for moving the optical head means to a target track on the optical disk medium on the basis of a seeking command from a host;
• said frequency setting means changing a frequency component of the clock signal of said clock generating means to a frequency component according to a zone of the target track;
• home position detecting means for detecting a predetermined, fixed home position with respect to said optical head means;
• and
• retry means for allowing the access means to move the optical head means to said home position in the case where the occurrence of a defective reading operation of the track address is judged by said access means and for allowing the rereading operation of the track address to be executed by using the clock signal of the zone frequency corresponding to the track address of the home position when a detection signal of said home position detecting means is obtained.

An optical disk apparatus using an optical disk medium having a plurality of circumferential tracks for reading or writing data from/onto the medium, said plurality of tracks being divided into a plurality of zones in the radial direction, the data being read out or written by using clock signals having frequency components which are different in every zone, wherein said apparatus comprises:

• an optical head for irradiating a light beam onto a selected track of said optical disk medium, thereby optically reading or writing the data;
• a servo circuit section for moving said optical head to selected positions and controlling the position of the light beam from said optical head with respect to said optical disk medium;
• a clock generating circuit for generating a clock signal which is used for the reading/writing operations of the optical disk medium and for changing a component of the frequency of said clock signal by setting frequency information received from a frequency setting circuit section;
• a reading circuit section for recognizing a track address of the selected track from a track passing signal which is obtained due to the movement of said optical head and for moving the optical head to a target track on the optical disk medium on the basis of a seeking command from a host;
• said frequency setting circuit section changing a frequency component of the clock signal of said clock generating circuit section to a frequency component according to the zone of a target track;
• a head position sensor for detecting the position of said optical head means;
• and
• a retry circuit section for allowing the track address to be again read by using a clock signal of the zone frequency set for the track address which was determined from a detection signal of said head position sensor, when said reading circuit section fails to read the track address due to a defect.

An optical disk apparatus using an optical disk medium having a plurality of circumferential tracks for reading or writing data from/onto the medium, said plurality of tracks being divided into a plurality of zones in the radial direction, the data being read out or written by using clock signals having frequency components which are different in every zone, wherein said apparatus comprises:

• an optical head for irradiating a light beam onto a selected track of said optical disk medium, thereby optically reading or writing the data;
• a servo circuit section for moving said optical head means to selected positions and controlling the position of the light beam from said optical head with respect to said optical disk medium;
• a clock generating circuit section for generating a clock signal which is used for reading/writing operations of the optical disk medium and for changing a component of the frequency of said clock signal by setting frequency information received from a frequency setting circuit section;
• a reading circuit section from recognizing a track address of the selected track from a track passing signal which is obtained due to the movement of said optical head and for moving the optical head to a target track on the optical disk medium on the basis of a seeking command from a host;
• said frequency setting circuit section changing a frequency component of the clock signal of said clock generating circuit section to a frequency component according to a zone of a target track;
• a home position sensor for detecting a predetermined, fixed home position with respect to said optical head;
• and
• a retry circuit section for allowing said reading circuit section to move the optical head to said home position in the case where the occurrence of a defective reading operation of the track address is judged by said reading circuit section and for allowing the rereading operation of the track address to be executed by using the clock signal of the zone frequency corresponding to the track address of the home position when a detection signal of said home position sensor is obtained.