Disk-shaped recording medium and apparatus for recording and/or reproducing data thereon

Claim 1

A disk-shaped recording medium having an annular recording surface extending around a center aperture, and a large number of radially successive recording tracks surrounding said center aperture, each of said recording tracks including a predetermined number of recording regions, corresponding recording regions in said radially successive recording tracks, respectively, being in radial alignment with each other, each of said recording regions including a control record region and a data write region following said control record region; each said control record region being divided into a first preformat region, a second preformat region and a focusing servo region; said first preformat region being disposed at the upstream side of the respective control record region and having at least one traverse data pit arrayed on a centerline of the respective track, said traverse data pit being allotted for each of said tracks; said second preformat region being disposed adjacent to said first preformat region and having a pair of tracking data pits spaced apart from each other by a predetermined distance in the direction along the respective track and arranged on radially inner and outer sides of said centerline, and a clock data pit arranged on said centerline; and said focusing servo region having a mirror-like surface and following said second preformat region.

Claim 8

An apparatus for recording and/or reproducing data on a disk-shaped recording medium having an annular recording surface extending around a center aperture, and a large number of radially successive recording tracks surrounding said center aperture, each of said recording tracks including a predetermined number of recording regions, corresponding recording regions in said radially successive recording tracks, respectively, being in radial alignment with each other, each of said recording regions including a control record region and a data write region following said control record region, each said control record region being divided into a first preformat region, a second preformat region and a focusing servo region, said first preformat region being disposed at the upstream side of the respective control record region and having at least one traverse data pit arrayed on a centerline of the respective track, said traverse data pit being allotted for each of the recording tracks, said second preformat region being disposed adjacent to said first preformat region and having a pair of tracking data pits spaced apart from each other a predetermined distance in the direction along the respective track and arranged on radially inner and outer sides of said centerline and a clock data pit arranged on said centerline, said focusing servo region having a mirror-like surface and following said second preformat region, said apparatus comprising: head means optically scanning said recording tracks on said disk-shaped recording medium and providing a playback output, timing generating means for generating timing clocks on the basis of clock signals included in said playback output of said head means in response to said clock data pits, and head servo means for sampling said playback output of said head means by said timing clocks to detect focusing data from each said focusing servo region and tracking data indicated by said tracking data pits in each said second preformat region and applying a focusing servo signal and a tracking servo signal to said head means.

Claim 9

An apparatus for recording and/or reproducing data on a disk-shaped recording medium having an annular recording surface extending around a center aperture, and a large number of radially successive recording tracks surrounding said center aperture, each of said recording tracks including a predetermined number of recording regions, corresponding recording regions in said radially successive recording tracks, respectively, being in radial alignment with each other, each of said recording regions including a control record region and a data write region following said control record region, each said control record region being divided into a first preformat region, a second preformat region and a focusing servo region, said first preformat region being disposed at the upstream side of the respective control record region and having at least one traverse data pit arrayed on a centerline of the respective track, said traverse data pit being allotted for each of the recording tracks, said second preformat region being disposed adjacent to said first preformat region and having a pair of tracking data pits spaced apart from each other a predetermined distance in the direction along the respective track and arranged on radially inner and outer sides of said centerline and a clock data pit arranged on said centerline, said focusing servo region having a mirror-like surface and following said second preformat region, said apparatus comprising: head means optically scanning said recording tracks on said disk-shaped recording medium and providing a playback output, timing generating means for generating timing clocks on the basis of clock signals included in said playback output of said head means in response to said clock data pits, and head servo means for sampling said playback output of said head means by said timing clocks to detect focusing data from each said focusing servo region and tracking data indicated by said tracking data pits in each said second preformat region and applying a focusing servo signal and a tracking servo signal to said head means.