Optical Medium Reproducing Apparatus Reducing Track Crosstalk
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Solution Overview
Problem
Existing optical medium reproducing technologies face complexity in electrical configuration due to the need for multiple beams and adaptive equalizer units to reduce adjacent track crosstalk, which complicates the reproduction process.
Innovation Solution
An optical medium reproducing apparatus that divides the returning beam into a first and second region based on the object lens's pupil shape, using detection signals from these regions to reduce crosstalk, allowing for single-beam reproduction and simplifying the electrical configuration by eliminating the need for additional beams and adaptive equalizer control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If three beams are used to read the reproduction target track and adjacent tracks for crosstalk reduction, then crosstalk is reduced, but the electrical configuration becomes complicated
Solution Approach 1:
The detection signal is segmented into multiple components corresponding to different tracks (reproduction target track and adjacent tracks). By separating the signal processing for each track within a single beam framework, the patent reduces crosstalk without requiring multiple physical beams, thus avoiding complexity in the electrical configuration while maintaining effective crosstalk reduction.
Solution Approach 2:
A single beam is made to serve multiple functions by sequentially reading the reproduction target track and adjacent tracks. The same beam and detection system are used for all track readings, and signal processing techniques are applied to distinguish and separate the signals from different tracks, eliminating the need for separate beams and reducing electrical configuration complexity.
2Device complexity
If one beam sequentially reproduces three tracks with synchronization, then hardware is simplified, but memory is necessary for synchronization
Solution Approach 1:
The synchronization function is extracted from the memory system and integrated into the signal processing pipeline. By processing and synchronizing signals in real-time as they are received from the single beam, the patent eliminates or reduces the need for separate memory components dedicated to synchronization, thereby reducing overall memory requirements while maintaining hardware simplicity.
3Quantity of substance
If track pitch is made narrower to increase optical disc density, then storage capacity is increased, but adjacent track crosstalk increases
Solution Approach 1:
The detection signal processing is tailored to locally distinguish signals from different tracks. By applying track-specific processing techniques to the segmented signal components, the patent can effectively reduce crosstalk from adjacent tracks even when the track pitch is narrow, thereby enabling high storage capacity while maintaining signal quality.
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 effectively reduces crosstalk between tracks, enabling simpler electrical processing and memory requirements, while maintaining low jitter and error rates during data reproduction on high-density optical discs.
Implementation Method 1
a beam returning from the optical medium is divided into a first region of an outside portion and a second region of an inside region, according to the shape of the pupil of an object lens
Data Source
AI summary
An optical medium reproducing apparatus that optically reproduces an optical medium on which a plurality of tracks is formed in which a beam returning from the optical medium is divided into a first region of an outside portion and a second region of an inside region, according to the shape of the pupil of an object lens, and crosstalk between the tracks is reduced by using a first detection signal of the first region and a second detection signal of the second region.