Method and apparatus for moving carriage assembly from initial position to target position and optical disc system including same

A control apparatus, comprising:

• a carriage assembly movable from an initial position to a target position relative to a respective storage medium having a center and a circumference, said respective storage medium rotating relative to said carriage assembly at a circumferential velocity about said center;
• means for determining a first radial distance between said initial position of said carriage assembly and said center of the storage medium;
• means for determining a second radial distance between said target position of said carriage assembly and said center of the storage medium;
• means for determining a circumferential distance between said initial position of said carriage assembly and said target position of said carriage assembly;
• means for determining an initial circumferential velocity of the storage medium about said center of the storage medium;
• and
• means for calculating a velocity trajectory relative to said first radial distance, said second radial distance, said circumferential distance, and said initial circumferential velocity so that when said carriage assembly is moved from said initial position to said target position with said velocity trajectory, said carriage assembly will arrive radially and circumferentially at said target position at substantially the same time.

A method for moving a carriage assembly from an initial position to a target position relative to a storage medium having a center and a circumference, and rotating relative to the carriage assembly at a circumferential velocity about the center, said method comprising the steps of:

• determining a first radial distance between the initial position of the carriage assembly and the center of the storage medium;
• determining a second radial distance between the target position of the carriage assembly and the center of the storage medium;
• determining a circumferential distance between the initial position of the carriage assembly and the target position of the carriage assembly taken parallel to said circumference of said storage medium;
• determining an initial circumferential velocity of the storage medium about the center of the storage medium;
• calculating a velocity trajectory relative to said first radial distance, said second radial distance, said circumferential distance, and said initial circumferential velocity so that when the carriage assembly is moved from the initial position to the target position with said velocity trajectory, the carriage assembly will arrive radially and circumferentially at the target position at substantially the same time;
• and
• moving the carriage assembly from the initial position to the target position substantially at said velocity trajectory.

A control apparatus, comprising:

• a carriage assembly movable from an initial position to a target position relative to a respective storage medium having a center and a circumference, said respective storage medium rotating relative to said carriage assembly at a circumferential velocity about said center;
• a first measuring assembly utilized to determine a first radial distance between said initial position of said carriage assembly and said center of the storage medium;
• a second measuring assembly employed to determine a second radial distance between said target position of said carriage assembly and said center of the storage medium;
• a third measuring assembly implemented to determine a circumferential distance between said initial position of said carriage assembly and said target position of said carriage assembly;
• a first detector assembly activated to determine an initial circumferential velocity of the storage medium about said center of the storage medium;
• and
• a processor operated to calculate a velocity trajectory relative to said first radial distance, said second radial distance, said circumferential distance, and said initial circumferential velocity so that when said carriage assembly is moved from said initial position to said target position with said velocity trajectory, said carriage assembly will arrive radially and circumferentially at said target position at substantially the same time.