Optical Disc Reproducing Method for Non-Finalized DVD+R Seek Control
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Solution Overview
Problem
Existing optical disc reproducing methods face challenges in accurately positioning the optical pickup on non-finalized DVD+R discs due to a small number of sectors, leading to out-of-focus issues and difficulties in reproducing these discs, particularly in in-vehicle systems.
Innovation Solution
An optical disc reproducing method that calculates the total jump number of tracks and determines the appropriate jump number based on specific conditions to adjust the optical pickup's position, using traverse seek, multi jump, and interval jump operations to accurately target the outer and inner circumferential zones, thereby avoiding unrecorded areas and ensuring accurate data retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the optical pickup moves from the inner circumferential side to the outer circumferential side to read the ICB in the closure, then the data can be accessed, but the optical pickup may move onto the non-recorded area causing out-of-focus state
Solution Approach 1:
The patent performs preliminary actions by executing a first seek operation to a first target address before the actual data access, and a second seek operation to a second target address before final data access. These preliminary seek operations position the optical pickup in advance to prevent it from moving onto non-recorded areas during normal operation, thereby maintaining focus stability while enabling data access.
2Ease of operation
If the optical pickup is positioned accurately in the closure with small number of tracks, then data access is enabled, but the apparatus structure becomes complicated increasing cost
Solution Approach 1:
The patent changes operational parameters by introducing different seek operation modes (first seek operation and second seek operation) with different target addresses and jump number calculations. Instead of modifying the physical apparatus structure, the invention achieves accurate positioning in the closure by dynamically adjusting seek parameters based on the non-finalized disc structure, thereby enabling data access without increasing device complexity.
Data Source
AI summary
There is provided an optical disc reproducing method capable of reproducing a non-finalized DVD+R. When a seek operation is performed from a present address on the non-finalized DVD+R to an outer circumferential side target address, the outer circumferential direction total jump number of tracks is calculated from a difference between the present address and the target address. When a first condition is satisfied in which the present address is in an inner circumferential zone, the target address is in a second outer circumferential zone, and the outer circumferential direction total jump number is 701 to 2500, the jump number of tracks is set to 340 smaller than the outer circumferential direction total jump number, and a traverse seek using a moving mechanism to move an optical pickup in a radius direction by 340 is performed.