Patent ID: 6922304
Filing Date: 2005-07-26
Classification: G11B

Abstract:
1. A positioning control apparatus for controlling a movement of a movable object to be positioned at a target position on a surface while estimating an actual position of the movable object on the surface on the basis of signals which signals are generated by the movable object and a value of each of which signals varies in accordance with a distance between the movable object and respective one of positional marks of at least two phases which are distant from each other on the surface, comprising, an object driver for driving the movable object to be positioned at the target position on the surface, and a sensor to be included by the movable object to generate the signals, wherein the surface includes a first range in which the actual position of the movable object is adapted to be estimated as a distance between the movable object and first one of the positional marks and a second range in which the actual position of the movable object is adapted to be estimated as a distance between the movable object and second one of the positional marks, and a distance data on the basis of which distance data an actual distance between the first one of the positional marks and the second one of the positional marks varying in accordance with a positional error in writing the positional marks onto the surface is adapted to be estimated is recorded in the positioning control apparatus.