Information recording/reproducing apparatus with variable rate of revolution and data clock frequency

• US 5,959,954 A
• Filed: 03/29/1996
• Issued: 09/28/1999
• Est. Priority Date: 08/08/1995
• Status: Expired due to Fees

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Yamamuro, Mikio
• Primary Examiner(s): Tran, Thang V.
• Application Number:
  US08/623,832
• Time in Patent Office: 1,278 Days
• Field of Search: 369/50, 369/47, 369/48, 369/58, 360/73.03, 360/73.05, 360/73.08
• US Class Current: 369/47.4
• CPC Class Codes: G11B 19/28 Speed controlling, regulating, or indicating G11B19/24 takes precedence
• CPC Class Codes: G11B 20/1258 where blocks are arranged within multiple radial zones, e.g. Zone Bit Recording or Constant Density Recording discs, MCAV discs, MCLV discs
• CPC Class Codes: G11B 20/1403 characterised by the use of two levels

Abstract

A data processing apparatus comprising a motor for revolving a disc-shaped recording medium by a given rate of revolution signal, a mechanism for storing data in and reproducing data from a specific region of the recording medium in response to a data storing/reproducing frequency signal, a circuit for selecting a constant mode or variable mode for the rate of revolution signal and supplying it to the motor, and a circuit for selecting a constant mode or variable mode for the frequency signal and supplying it to the storing/reproducing mechanism.

Claims

1. A data processing apparatus, comprising:

optical disc holding means for holding an optical disc which records and reproduces data, the optical disc having first, second, third, and fourth regions of data;

revolution control means for executing revolution control of the optical disc at one of the first, second, third and fourth rates of revolution for each corresponding first, second, third and fourth regions;

the first region being formatted according to an M-CAV system so that said optical disc is rotated at a first rate of revolution when reading/writing data in the first region, and having a first plurality of zones, each zone of said first plurality of zones having its own clock frequency so that a recording density remains constant,

the second region being located adjacent to the first region and being formatted according to an M-CAV system so that said optical disc is rotated at a second rate of revolution that is different from the first rate of revolution when reading/writing data in the second region, and having a second plurality of zones, each zone of said second plurality of zones having its own clock frequency so that a recording density remains constant,

the third region being located adjacent to the second region and being formatted according to an M-CAV system so that said optical disc is rotated at a third rate of revolution that is different from the first and second rates of revolution when reading/writing data in the third region, and having a third plurality of zones, each zone of said third plurality of zones having its own clock frequency so that a recording density remains constant, and

the fourth region being located adjacent to the third region and being a region formatted according to an M-CAV system so that said optical disc is rotated at a fourth rate of revolution that is different from the first, second, and third rates of revolution when reading/writing data in the fourth region, and having a fourth plurality of zones, each zone of said fourth plurality of zones having its own clock frequency so that a recording density remains constant, and

reproducing means for reproducing information stored in each of the zones in each of the first, second, third and fourth regions in accordance with the clock frequency of the corresponding zone.

2. A data processing apparatus, comprising:

optical disc holding means for holding an optical disc which records and reproduces data, the optical disc having first and second regions of data;

revolution control means for executing revolution control of the optical disc at one of the first and second rates of revolution for each corresponding first and second regions;

the first region being formatted according to an M-CAV system so that said optical disk is rotated at a first rate of revolution when reading/writing data in the first region, and having a first plurality of zones, each zone of said first plurality of zones having its own clock frequency so that a recording density remains constant, and

the second region being located adjacent to the first region and being formatted according to an M-CAV system so that said optical disc is rotated at a second rate of revolution that is different from the first rate of revolution when reading/writing data in the second region, and having a second plurality of zones, each zone of said second plurality of zones having its own clock frequency so that a recording density remains constant, and

reproducing means for reproducing information stored in each of the zones in each of the first and second regions in accordance with the clock frequency of the corresponding zone.