Dual Control Module Optical Disc Drive for Simultaneous Layer Access
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Solution Overview
Problem
Conventional optical disc drives require the physical rotation and repositioning of double-sided optical discs to access data on both sides, which is inefficient and time-consuming, as they typically have a single optical pickup head that needs to focus on one side at a time.
Innovation Solution
An optical disc drive with two control modules, each equipped with an optical pickup head, that communicate through a negotiation signal to simultaneously access and control the data layers of a double-sided optical disc, allowing for simultaneous data access from both sides without the need for physical rotation or repositioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single optical pickup head is used to access double-sided optical disc, then the device complexity is reduced, but the data access speed deteriorates due to sequential access requirement
Solution Approach 1:
The optical disc drive is segmented into two independent control modules (first control module with first optical pickup head, second control module with second optical pickup head), each capable of independently accessing one side of the double-sided optical disc. This segmentation allows simultaneous access to both sides, resolving the contradiction between device complexity and data access speed.
Solution Approach 2:
Two optical pickup heads and their respective control modules are merged into a single optical disc drive system, sharing common components such as the spindle motor and optical disc loading mechanism. This merging enables simultaneous access to both sides of the disc while avoiding complete duplication of the entire drive system, thus managing device complexity.
2Device complexity
If a single optical pickup head sequentially accesses both sides of double-sided optical disc, then the device complexity is reduced, but the access time increases due to physical rotation and repositioning
Solution Approach 1:
The drive is divided into two control modules that can simultaneously operate on both sides of the disc, eliminating the need for sequential access and physical repositioning between sides, thus reducing access time while maintaining manageable device complexity.
Solution Approach 2:
Both optical pickup heads can operate continuously and simultaneously on their respective sides of the disc without interruption or repositioning, achieving continuous useful action on both sides concurrently, which dramatically reduces access time compared to sequential operations.
3Productivity
If two control modules with optical pickup heads are used to simultaneously access both sides, then the data access speed is improved, but the device complexity increases
Solution Approach 1:
Two control modules are merged into a unified system that shares common infrastructure including the spindle motor, optical disc tray, and housing. This merging reduces the overall device complexity compared to having two completely separate drives, while still achieving simultaneous access and improved data access speed.
Solution Approach 2:
Each control module is designed with multi-functionality to handle various operations (reading, writing, seeking) on its assigned side of the disc. This universality reduces the need for specialized components for each side, thereby managing device complexity while maintaining high productivity.
4Ease of operation
If two control modules communicate through negotiation signal, then the coordination between optical pickup heads is improved, but the control system complexity increases
Solution Approach 1:
The negotiation signal mechanism implements feedback between the two control modules, allowing them to coordinate their operations and avoid conflicts. This feedback-based coordination improves ease of operation by enabling intelligent resource management, while the standardized feedback protocol keeps control system complexity manageable.
Data Source
AI summary
An optical disc drive includes a spindle motor, a first control module and a second control module. The spindle motor includes a turn table for supporting and rotating an optical disc. The first control module includes a first optical pickup head corresponding to a first data layer of the optical disc. The first control module is connected with a host through a first bus to execute a first control command. The second control module includes a second optical pickup head corresponding to a second data layer of the optical disc. The second control module is connected with the host through a second bus to execute a second control command. The first control module and the second control module communicate with each other according to a negotiation signal. Moreover, the spindle motor is operated at a target rotation speed under control of the first control module.