Optical Recording Medium Groove Wobble Address Encoding
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Solution Overview
Problem
Current optical-information recording media face challenges in increasing recording capacity without requiring complex mastering technologies and in efficiently recording address information without reducing the data region for user data.
Innovation Solution
An optical-information recording medium with alternately provided grooves and lands, where address information is recorded using wobbles in the grooves and a combination of wobbles at the sides of the land, allowing single-beam exposure during mastering and efficient data recording.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If address information is recorded as preformat pits, then address information can be recorded, but the data region for user data is reduced
Solution Approach 1:
The patent extracts the address information recording function from the data region by recording it in the groove modulation signal instead of using preformat pits in the data region. This separation allows the data region to be fully available for user data while address information is recorded in the groove track through modulation techniques.
Solution Approach 2:
The groove track serves multiple functions: it defines the track path and simultaneously carries address information through modulation. The groove modulation signal is used both for tracking and for encoding address information, eliminating the need for separate preformat pits.
2Manufacturing precision
If complex mastering technology is used, then address information can be recorded efficiently, but manufacturing complexity increases
Solution Approach 1:
The patent replaces complex mechanical mastering processes with optical modulation techniques. Instead of using complex physical mask alignment and exposure systems, the address information is recorded by modulating the groove formation process itself, which can be achieved with simpler optical systems.
Solution Approach 2:
The patent changes the parameter being modulated in the groove from simple depth modulation to include phase and frequency modulation. By encoding address information in the modulation parameters of the groove signal rather than requiring complex spatial patterns, the mastering process becomes simpler while maintaining precision.
3Adaptability or versatility
If wobble recording is used in both groove and land tracks, then address information can be recorded on both tracks, but the system complexity increases
Solution Approach 1:
The patent extracts the address information recording from the land track and concentrates it in the groove track. The groove modulation signal carries all address information, which is then made accessible during both groove scanning and land scanning operations, eliminating the need for separate wobble recording in land tracks.
Solution Approach 2:
The groove modulation signal serves as a universal source of address information for both groove track playback and land track playback. The same modulated groove signal provides address data regardless of which track type is being scanned, simplifying the overall system architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enables efficient recording of address information without reducing the data region for user data and allows for the fabrication of optical-information recording media without complex mastering technologies, enhancing recording capacity and reducing susceptibility to blemishes.
Implementation Method 1
an optical unit configured to obtain reflection light by irradiating a land or a groove of an optical-information recording medium with light
Implementation Method 2
Address information in the groove is recorded by wobbles in the groove
Data Source
AI summary
An optical-information recording medium includes a groove and a land that are alternately provided. Address information in the groove is recorded by wobbles in the groove, and address information on the land is recorded by a combination of the wobbles in the grooves provided at two opposite sides of the land.