Lead Screw with Variable Diameter Sections for Disc Drive Locking
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Solution Overview
Problem
In existing disc drives, the separate installation of a solenoid for the lock release unit increases manufacturing costs and prevents smooth movement of the optical pickup unit due to the lack of integration between the feed guide and lead screw.
Innovation Solution
A disc drive design featuring a lead screw with sections of different diameters, where the lock release unit is driven by a pickup transporting unit, and a feed guide connects the optical pickup base to the lead screw, allowing the lock release unit to be interrupted at a diameter changing point, enabling smooth movement and integrated operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a solenoid is separately installed for the lock release unit, then the locking function can be achieved, but manufacturing costs increase and space is consumed
Solution Approach 1:
The lock release unit is merged with the pickup transporting unit by utilizing the lead screw as a common component. The lead screw serves dual functions: transporting the optical pickup unit and releasing the tray lock. This integration eliminates the need for a separate solenoid installation, reducing component count, manufacturing costs, and space requirements while maintaining reliable locking functionality.
2Ease of operation
If the feed guide is not combined with the lead screw, then the structure is simpler, but the optical pickup unit cannot be smoothly moved
Solution Approach 1:
The feed guide is combined with the lead screw to form an integrated structure. The feed guide is positioned to engage with the lead screw threads, ensuring that rotational movement of the lead screw is efficiently converted into linear movement of the optical pickup unit. This integration smooths the movement operation while the modular design keeps the integration structure manageable.
3Reliability
If the lead screw has uniform diameter, then manufacturing is simpler, but the lock release unit cannot be properly interrupted at different positions
Solution Approach 1:
The lead screw features varying diameter along its length, with different sections having different diameters. This local quality variation enables the lock release unit to be properly interrupted at specific positions along the lead screw travel. The first section has a larger diameter for structural strength and motor connection, while the second section has a smaller diameter to allow proper engagement and interruption for the lock release mechanism, ensuring reliable operation.
Data Source
AI summary
Provided is a disc drive including a main chassis, and a tray, which may receive a disc thereon, and is arranged to slide into and out of the main chassis. The tray includes a pickup transporting unit which linearly moves a pickup base in a radial direction of the disc and includes a step motor and a lead screw. The lead screw includes a plurality of sections with different diameters.