Patent Number: 6,298,021

Title: Optical disc and optical disc apparatus for forming wobbled tracks

Abstract: An optical disc and associated recording/reproducing apparatus is described which creates and reads wobbled tracks on the optical disc. Wobbled tracks are formed in correspondence to a wobble signal which is phase modulated with address information. Phase modulation is used to convert the address information to the wobble signal. The carrier to noise ratio (C/N) of the address information is good, and it is possible to shorten the wobbling amplitude of the tracks while maintaining addressing capabilities. It is thus possible to arrange the track pitch in a high density, and increase the recording capacity of the optical disc.

Inventors: Aoki; Ikuo (Yokohama, JP)

Assignee: Ricoh Company, Ltd.

International Classification: G11B 7/0037 (20060101); G11B 7/00 (20060101); G11B 7/007 (20060101); G11B 7/26 (20060101); G11B 7/005 (20060101); G11B 007/00 ()

Expiration Date: 10/02/2018