Optical Disk Alternation Process Controller

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Solution Overview

Problem

Conventional disk recording/reproducing apparatuses take a long time for the alternation process due to automatic determination of alternation areas without consideration for the position of the disk defect, leading to inefficient movement and rotation speed control.

Innovation Solution

A disk recording/reproducing apparatus that determines the alternation destination and rotation speed based on the position of the alternation origin, using a controller to adjust the alternation destination and drive speed during the alternation process, especially when alternation areas are present on the innermost and outermost peripheries, or when using Constant Angular Velocity (CAV) or Constant Linear Velocity (CLV) recording methods.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If the alternation area is determined automatically without considering the position of the alternation origin, then the apparatus can maintain a simple control structure, but the alternation process time becomes excessively long due to unnecessary pickup movement and rotation speed changes

Engineering Contradiction:

Improvealternation process timeVSAvoidcontrol structure complexity

Core Design Contradiction:

Loss of timeVSDevice complexity

Solution Approach 1:

The controller determines the alternation destination and rotation speed in advance based on the alternation origin position before actually performing the alternation process. This preliminary determination prevents unnecessary pickup movement and rotation speed changes, thereby shortening the alternation process time without significantly increasing control complexity

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The system dynamically adjusts the alternation destination and rotation speed based on the position of the alternation origin. By making the control parameters dynamic rather than fixed, the system optimizes the alternation process for different defect positions, reducing overall process time while maintaining manageable control structure

Inventive Principle:

Principle #15Dynamics

2Adaptability or versatility

If the pickup is moved to an alternation area on the opposite side of the disk without considering the alternation origin position, then all alternation areas can be utilized, but the movement time and rotation speed adjustment time increase significantly

Engineering Contradiction:

Improvealternation area utilizationVSAvoidpickup movement time

Core Design Contradiction:

Adaptability or versatilityVSLoss of time

Solution Approach 1:

The system selects the alternation destination based on the local condition of the alternation origin position. Instead of using a fixed alternation area, the controller chooses between inner and outer alternation areas depending on where the defect occurred, optimizing the pickup movement distance and rotation speed adjustment time for each specific case

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If the rotation speed is changed significantly during the alternation process, then the alternation can be performed flexibly, but the response time decreases and the process becomes slower

Engineering Contradiction:

Improvealternation process flexibilityVSAvoidresponse speed

Core Design Contradiction:

Adaptability or versatilityVSSpeed

Solution Approach 1:

The system optimizes the rotation speed parameter by determining the appropriate speed based on the alternation origin position before the alternation process. This prevents excessive rotation speed changes during the process, maintaining fast response while still allowing flexible alternation between different areas of the disk

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS7817515B2Optical disk recording/reproducing apparatus and alternation process method thereof

Publication Date: 2010.10.19 HITACHI CONSUMER ELECTRONICS CORP

AI summary

Within a disk recording/reproducing apparatus for improving a transfer rate when recording/reproducing, and an alternation process method for a disk for it, for recording or reproducing information onto/from an optical disk 100, while conducting a alternation on a defect block within a user data recording area into an alternation area, a controller 500 determines an alternation destination where data of an alternation origin are recorded therein, or a drive speed during the alternation process, upon basis of the position of the alternation origin on the optical disk, when conducting the alternation process. The alternation destination is determined upon basis of an intermediate position (rmid) of the disk, when the optical disk includes alternation areas on an innermost periphery and an outermost periphery thereof, and when it is conducted with CAV recording, on the other hand it is determined upon basis of an inner/outer peripheral rotation speed average position (rav) of the disk, when being conducted with CLV recording. Or, the drive speed during the alternation process is determined on the position of the alternation origin, upon basis of a drive speed inner peripheral rotation speed average position (rint), when the optical disk includes the alternation area only on the innermost periphery thereof, and when it is conducted with CLV recording.