Optical Disc Flag Area for High-Speed Lead-Out Recording

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Solution Overview

Problem

In single-layer optical discs, the start position of the lead-out area cannot be determined, leading to inefficiencies in recording time due to the need for sync information and address information recording during finalize processing, and the inability to reduce the length of the lead-out area effectively for high-speed recording.

Innovation Solution

An information recording medium with an edge portion area and a flag area to indicate pre-recorded information, allowing for efficient recording by preventing laser runaway and reducing the need for pre-recording in the finalize processing, and enabling variable length of the lead-out area for high-speed recording.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If the lead-out area length is reduced for high-speed recording, then recording speed is improved, but compatibility with ROM discs deteriorates

Engineering Contradiction:

Improverecording speedVSAvoidcompatibility with ROM discs

Core Design Contradiction:

SpeedVSAdaptability or versatility

Solution Approach 1:

The patent applies preliminary action by pre-recording synchronization information and address information in the lead-out area before the finalize processing. This allows the lead-out area to be properly structured in advance, enabling both high-speed recording and ROM disc compatibility without conflict during the finalize process.

Inventive Principle:

Principle #10Preliminary action

2Adaptability or versatility

If sync information and address information are recorded during finalize processing, then ROM disc compatibility is maintained, but recording time increases

Engineering Contradiction:

ImproveROM disc compatibilityVSAvoidfinalize processing time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The patent moves the recording of synchronization information and address information from the finalize processing stage to the data recording stage. By performing this action preliminarily during data recording, the finalize processing time is reduced while ROM disc compatibility is maintained.

Inventive Principle:

Principle #10Preliminary action

3Adaptability or versatility

If the start position of the lead-out area is not determined, then recording flexibility is improved, but the inability to form embossed pits or pre-marks deteriorates copying protection

Engineering Contradiction:

Improverecording flexibilityVSAvoidcopying protection

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent determines the start position of the lead-out area in advance and pre-records synchronization information and address information at this position before finalize processing. This preliminary determination and pre-recording enable both recording flexibility and proper copying protection through embossed pits or pre-marks.

Inventive Principle:

Principle #10Preliminary action

Data Source

PatentUS7768899B2Optical recording medium having management area for replicating pre-record flag

Publication Date: 2010.08.03 PEZYOTTA DIGITAL DATA MACHINE LTD

AI summary

An information recording medium (100) is provided with: a record information area (106) to record therein record information; an edge portion area (104, 108, 109) which is located in at least one edge portion of the record information area; and a flag area (121) to record therein a first pre-record flag for indicating whether or not predetermined pre-information is pre-recorded in at least one portion of the edge portion area.