Optical Storage Discrimination via Reflection Layer Distance
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Solution Overview
Problem
Existing optical storage devices face challenges in quickly and accurately discriminating between DVD and CD media due to differences in physical characteristics, leading to time-consuming and unreliable identification processes.
Innovation Solution
The method involves reading a predetermined range of the optical storage medium to identify the longest data transition region and using the time-consumption or PLL clock frequency to determine the type, with additional discrimination through the distance between reflection and surface layers, allowing for efficient differentiation based on physical characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical pickup head uses standard reading operations to discriminate optical storage medium type, then the discrimination can be performed, but the time-consumption increases and the process becomes unreliable
Solution Approach 1:
The patent applies preliminary action by measuring the distance to the reflection layer before performing full data reading operations. This preliminary measurement allows the system to quickly determine the optical storage medium type (CD or DVD) based on the reflection layer position, avoiding the need to perform complete focusing, tracking, and data reading sequences that would consume excessive time. The reflection layer distance serves as an early indicator that enables rapid discrimination.
2Reliability
If the optical pickup head performs complete reading operations to confirm medium type, then accurate discrimination is achieved, but the operations must be re-performed causing time-consumption
Solution Approach 1:
The patent extracts the critical discrimination feature (reflection layer distance) from the complete reading operation sequence. By isolating and measuring only this specific parameter, the system can determine the optical storage medium type without performing the entire focusing, tracking, and data reading process. This extraction of the essential discriminative feature enables quick identification while maintaining accuracy.
3Productivity
If the system assumes the optical storage medium is DVD and uses DVD parameters, then reading can proceed quickly, but misidentification occurs when it is actually CD
Solution Approach 1:
The patent performs a preliminary measurement of the reflection layer distance before attempting to read data with assumed parameters. This preliminary action provides accurate medium type identification, allowing the system to select the correct reading parameters (CD or DVD) in advance, thereby maintaining both high reading speed and reliable medium type identification without misidentification errors.
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 rapid and accurate discrimination of optical storage media types, reducing time-consumption and avoiding misidentification, while also recognizing blank disks efficiently.
Implementation Method 1
the light source is focused on
Implementation Method 2
the reflection layer of a DVD is substantially at an intermediate position between the upper lower surface layers of the DVD, while the reflection layer of a CD is located underneath the surface layer more distant from the light source
Data Source
AI summary
A method for discriminating an optical storage medium is disclosed. A predetermined range of the optical storage medium is read after the light source is focused on; and thereby a plurality of data transition points and transition regions defined by an interval of two neighboring points are obtained. Thereafter, the time-consumption for reading the longest transition region is used to determine the type of the currently accessed optical storage medium. Another physical characteristics according to data storage formats, such as the PLL clock frequency or the distance between the reflection layer and the surface layer of the optical storage medium, may be used as references to discriminate the currently accessed optical storage medium.