Multi-standard optical disk reading method having distinction process

• US 5,587,981 A
• Filed: 09/05/1995
• Issued: 12/24/1996
• Est. Priority Date: 09/05/1995
• Status: Expired due to Term

• Current Assignee: LaserDynamics, LLC (General Patent Corporation)
• Original Assignee: Yasuo Kamatani
• Inventors: Kamatani, Yasuo
• Primary Examiner(s): Tran, Thang V.
• Application Number:
  US08/523,461
• Time in Patent Office: 476 Days
• Field of Search: 369/44.26, 369/44.25, 369/13, 369/54, 369/47, 369/48, 369/116, 369/94, 369/58
• US Class Current: 369/47.54
• CPC Class Codes: G11B 19/12 by sensing distinguishing features of or on records, e.g. diameter end mark
• CPC Class Codes: G11B 2007/0013 for carriers having multiple discrete layers
• CPC Class Codes: G11B 2220/2583 wherein two standards are used on a single disc, e.g. one DVD section and one CD section
• CPC Class Codes: G11B 27/329 on a disc [VTOC]
• CPC Class Codes: G11B 7/0037 with discs
• CPC Class Codes: G11B 7/007 Arrangement of the information on the record carrier, e.g. form of tracks , actual track shape, e.g. wobbled, or cross-section, e.g. v-shaped; Sequential information structures, e.g. sectoring or header formats within a track
• CPC Class Codes: G11B 7/0945 Methods for initialising servos, start-up sequences

Abstract

An optical disk reading method to provide an optical disk reading system which is able to reproduce encoded optical data from varied optical disk format fabricated in accordance with different standard. Before start reproducing data on an optical disk, a set of standard data which includes data of total number of data layer, pit density and track pitch is identified by reading a total of contents data encoded in a reading region of the optical disk. If the total of contents data is not encoded on the optical disk, any encoded pits on the optical disk is processed until the standard of the optical disk is identified. After the standard of the optical disk is identified, modulation of each servo circuit such as a focusing lens servo circuit and a tracking servo circuit is settled to start reproducing data on the optical disk.

Claims

1. An optical disk reading method comprising the steps of:

reading a total of contents data in a read-in region of an optical disk to identify total number of data layers and pit configuration standard of the optical disk; and

settling modulation of servomechanism means dependent upon the total of contents data;

(a)the servomechanism means including;

a focusing lens servo to modulate position of a focusing lens; and

a tracking servo to modulate movement of a pickup.

2. An optical disk reading method comprising the steps of:

reading a total of contents data in a read-in region of an optical disk to identify total number of data layers and pit configuration standard of the optical disk;

collating the total of contents data with an optical disk standard data which is stored in a memory; and

settling modulation of servomechanism means dependent upon the optical disk standard data which corresponds with the total of contents data;

(b) the servomechanism means including;

a focusing lens servo to modulate position of a focusing lens; and

a tracking servo to modulate movement of a pickup.

3. An optical disk reading method comprising the steps of:

processing an optical signal reflected from encoded pits on an optical disk until total number of data layers and pit configuration standard of the optical disk is identified;

collating the processed optical signal with an optical disk standard data which is stored in a memory; and

settling modulation of servomechanism means dependent upon the optical disk standard data which corresponds with the processed optical signal;

(c) the servomechanism means including;

a focusing lens servo to modulate position of a focusing lens; and

a tracking servo to modulate movement of a pickup.