| 摘要 |
A recording medium such as an optical disk (11) with address information retained relative to tracks (T) where data are recorded and/or reproduced. In this disk (11), lands and grooves are arranged alternately, and either the lands or the grooves constitute tracks (T). The grooves wobbled on the basis of address information and the non-wobbled DC grooves are arranged alternately while the lands are interposed therebetween. There is also provided an optical disk apparatus which comprises an irradiator for irradiating a first light beam spot to a target track on the optical disk, and further irradiating second and third light beam spots to the diametrical two sides of the center light beam spot; a light beam receiver for receiving the reflections of the first, second and third light beam spots from the optical disk (11), to thereby obtain first, second and third signals; and a calculator for calculating an address signal on the basis of the second and third signals. <IMAGE> |
