Optical Disk Tray Peripheral Design for Wind Noise Reduction
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Solution Overview
Problem
Conventional optical disk apparatuses fail to effectively reduce wind noise generated during high-speed disk rotation, as existing solutions either do not adequately address noise reduction or compromise loading properties and manufacturing costs.
Innovation Solution
An optical disk apparatus with a tray design featuring a flat circular region and a peripheral portion that rises to match the disk's surface height, with a distance gap of 1.8 mm to 2.7 mm from the disk's tip, reducing airflow velocity and noise while maintaining structural integrity and ease of loading.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the rotation speed of the disk is increased to increase memory capacity and access speed, then productivity and memory capacity are improved, but wind noise generated during rotation increases significantly
Solution Approach 1:
A buffer portion is introduced as an intermediary structure between the rotating disk and the stationary tray body. This buffer portion absorbs and redirects the airflow generated by high-speed disk rotation, preventing direct air cutting noise while maintaining the high rotation speed necessary for fast data access
Solution Approach 2:
The tray structure is segmented into multiple functional regions: a flat portion for disk placement, a buffer portion for noise reduction, and a peripheral portion for structural support. This segmentation allows each region to perform its specific function optimally without interfering with others
2Object-generated harmful factors
If a step-like portion is formed on the drawer frame to reduce wind noise, then wind noise is reduced to some extent, but loading properties deteriorate and the optical disk is caught during loading
Solution Approach 1:
The noise reduction function is localized to the buffer portion which is positioned specifically at the periphery of the tray, while the central flat portion maintains its smooth, step-free surface to ensure proper disk loading and guide the disk to the predetermined position without obstruction
3Object-generated harmful factors
If a step-like portion is formed on the drawer frame to reduce wind noise, then wind noise is reduced, but the die becomes complex and manufacturing costs increase
Solution Approach 1:
The buffer portion is integrated into the tray body as a single molded component rather than a separate part. This merging of functions into one piece allows the entire tray with noise reduction features to be manufactured in a single molding process, avoiding the need for complex multi-step manufacturing or assembly
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
The solution significantly reduces wind noise during high-speed rotation, particularly at higher frequencies, without complicating the manufacturing process or increasing costs, and ensures the optical disk is properly guided and loaded.
Implementation Method 1
flows of air having a large flow velocity, within a gap defined between an upper end surface portion of step-like portion and the tip portion of the disk rotating at high speed
Data Source
AI summary
An optical disk apparatus, enabling to reduce noises, the wind sounds generated due to rotation of a disk, with certainty, irrespective of an increase in rotation speed of the disk, comprises a disk motor 12 for rotating the optical disk 100 loaded into an inside thereof, an optical pickup 15 for recording or reproducing information from or onto the optical disk rotated, and a tray 10 for loading the optical disk therein, wherein the tray has a flat surface 10c, being nearly circular in the shape, on which the optical disk is disposed, and a peripheral portion 10d formed surrounding a periphery thereof, and the peripheral portion is nearly equal to an upper surface of the optical disk, and further a distance from a tip portion of the optical disk to be loaded within the apparatus is equal to 1.8 mm or larger than that and equal to 4.0 mm or smaller than that, in particular, preferably it is equal to 2.0 mm or larger and equal to 2.7 mm or smaller.