Optical Disc Control Apparatus for High-Speed Startup
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Solution Overview
Problem
Optical discs without recorded areas pose challenges for high-speed startup and accurate reproduction control, as they lack measurable indicators like jitter, and existing methods struggle to efficiently determine the presence of recorded areas, especially in multi-layer recording media with varying characteristics.
Innovation Solution
A control apparatus and method that determine the presence of recorded areas by searching for defect management and control data areas, using subcode information and reflected light analysis, and adjusting access parameters to create a recorded area for reproduction adjustment, enabling high-speed startup and reliable access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional startup procedures are used on optical discs without recorded areas, then the apparatus performs focus and tracking adjustments, but the process is time-consuming and cannot achieve high-speed startup
Solution Approach 1:
The patent applies preliminary action by pre-recording control data and defect management information in specific areas (lead-in area, lead-out area, or data area) during the disc manufacturing or initialization process. This control data includes predetermined focus and tracking adjustment parameters that are prepared in advance, eliminating the need for time-consuming real-time adjustments during startup. The apparatus can directly access these pre-prepared control data to perform rapid reproduction control.
2Reliability
If the apparatus performs reproduction adjustments on optical discs without recorded areas, then it can establish reproduction control parameters, but it requires extensive searching and testing which reduces productivity
Solution Approach 1:
The patent extracts the reproduction control parameters and defect management information from the need for real-time measurement and testing, and places them into predetermined control data areas on the disc. By separating the control data from the user data areas and placing it in dedicated regions (lead-in area, lead-out area), the system can directly read these control parameters without performing extensive searching and testing operations, thus maintaining reliability while improving productivity.
Solution Approach 2:
The patent introduces control data as an intermediary element between the disc structure and the reproduction apparatus. This control data acts as a mediator that provides predetermined focus and tracking adjustment information, eliminating the need for the apparatus to perform extensive trial-and-error measurements. The control data serves as a bridge that translates disc physical characteristics into actionable reproduction control parameters.
3Measurement precision
If the apparatus searches for recorded areas on optical discs, then it can determine where to access data, but the search process is time-consuming especially on multi-layer discs with varying characteristics
Solution Approach 1:
The patent applies preliminary action by pre-marking and organizing control data areas (lead-in area, lead-out area, and data areas with logical block addresses) during disc manufacturing or initialization. These predetermined areas contain control data that explicitly indicates their purpose and location. The apparatus can quickly identify these areas through their structured organization and control information without performing extensive trial reads across the entire disc surface, thus maintaining detection accuracy while reducing search time.
4Reliability
If repeated access adjustments are performed on optical discs, then reproduction quality can be optimized, but the mechanical components wear out faster reducing disc life
Solution Approach 1:
The patent applies preliminary action by pre-determining and storing optimal focus and tracking adjustment parameters in control data areas during disc manufacturing or initialization. These predetermined parameters are based on the specific disc's physical characteristics measured during production. By using these pre-optimized parameters stored in the control data, the apparatus can achieve high reproduction quality without performing repeated trial-and-error adjustments during each startup, thereby reducing mechanical wear and extending disc service life.
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
Enables efficient determination of recorded areas, facilitating high-speed startup and improved reproduction quality on optical discs, even without initial recorded areas, and extends the life of optical discs by reducing unnecessary access adjustments.
Implementation Method 1
an optical pickup shifts to a prerecorded area... a laser of a reproduction apparatus emits light. An optical disc is irradiated with a light beam having a reproduction power.
Data Source
AI summary
A control apparatus is provided for controlling an access means for accessing a recording medium containing at least one area so that the access means accesses the at least one area. The apparatus comprises a means for determining whether or not at least one first recorded area storing data is included in the at least one area, and a means for controlling the access means. When it is determined that the at least one first recorded area is included in the at least one area, the control means controls the access means based on a result of accessing the at least one first recorded area.