OPTICAL RECORDING MEDIUM AND DIRECTION DETECTOR

摘要

A plurality of servo regions (110) and data regions (120) are alternately arranged along the track center line (102), and the servo regions (110) are each provided with a clock mark (111), a first wobble mark (112) and a second wobble mark (113). The plurality of servo regions (110) constitute a plurality of servo pattern regions (110a to d) radially disposed in a repeated sequence. The plurality of servo pattern regions (110a to d) differ from one another in at least one arrangement selected from an arrangement of the first wobble mark (112) with respect to the clock mark (111) and an arrangement of the second wobble mark (112) with respect to the clock mark (111). The above configuration can easily and accurately detect the relative moving direction of a light spot with respect to an optical recording medium.