Turntable Elastic Layer High Contact Pressure Dust Embedding

Solution Overview

Problem

Dust entering a disc drive can lower the friction coefficient of the elastic layer on a turntable, leading to relative slip between the disc support surface and the disc member, and cause surface deflection during rotation due to unevenness in the elastic layer's height.

Innovation Solution

A turntable with an elastic layer that has high contact pressure portions on its outer or inner peripheral parts, which are designed to embed dust and maintain friction, and edge portions that form a predetermined angle to disperse dust effectively, preventing slip and surface deflection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an elastic layer is provided on the disc support surface to increase friction force, then slip between the disc support surface and the disc member is prevented, but when dust attaches to the elastic layer surface, the friction coefficient is remarkably lowered and slip generation is deteriorated

Engineering Contradiction:

Improveslip preventionVSAvoiddust attachment effect

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The elastic layer is designed with non-uniform thickness, featuring a thinned portion at the center and a thickened portion at the periphery. This local variation in thickness creates different contact pressure characteristics across the elastic layer, allowing the periphery to maintain higher friction coefficient even when dust is present, thus preventing slip while accommodating dust contamination.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If a rubber molding is used as the elastic layer, then the elastic layer can be formed with predetermined shape, but the height of the elastic layer varies especially in the circumferential direction, generating surface deflection during rotation

Engineering Contradiction:

Improvemolding capabilityVSAvoidheight uniformity

Core Design Contradiction:

Ease of manufactureVSManufacturing precision

Solution Approach 1:

The elastic layer is designed with non-uniform thickness, featuring a thinned portion at the center and a thickened portion at the periphery. This local variation in thickness creates different contact pressure characteristics across the elastic layer, allowing the periphery to maintain higher friction coefficient even when dust is present, thus preventing slip while accommodating dust contamination.

Inventive Principle:

Principle #3Local quality

3Stability of the object's composition

If the elastic layer height is made uniform, then surface deflection during rotation is suppressed, but the contact pressure distribution becomes insufficient to embed dust effectively

Engineering Contradiction:

Improvesurface flatnessVSAvoiddust embedding capability

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The elastic layer is designed with non-uniform thickness, featuring a thinned portion at the center and a thickened portion at the periphery. This local variation in thickness creates different contact pressure characteristics across the elastic layer, allowing the periphery to maintain higher friction coefficient even when dust is present, thus preventing slip while accommodating dust contamination.

Inventive Principle:

Principle #3Local 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

The high contact pressure portions and angled edge designs effectively embed and disperse dust, maintaining the friction coefficient and preventing relative slip and surface deflection, even when dust accumulates, thus ensuring stable disc rotation.

Implementation Method 1

thereby utilizing an elastic deformation of the elastic layer to embed the dust

Methodology Applied

Scientific EffectElastic deformation: Elasticity

Implementation Method 2

a high contact pressure portion of which a contact pressure generated by pressing the clamp member thereto is higher than that of other portion

Methodology Applied

Scientific EffectCompression: Compression

Implementation Method 3

an elastic layer made of such as rubber which increases a friction force between the disc support surface and the disc member

Methodology Applied

Scientific EffectFriction: Friction

Data Source

PatentUS8752080B2Turntable having elastic layer with high contact pressure portion

Publication Date: 2014.06.10 PANASONIC HOLDINGS CORP

AI summary

Provided is a turntable for rotatably supporting a disc member on a disc support surface in a state where the disc member is sandwiched and held between the turntable and a clamp member placed opposite thereto, wherein the disc support surface is provided with an elastic layer having a predetermined width, and configured to project from the disc support surface, and at least one of an outer peripheral part and an inner peripheral part of the elastic layer is provided with a high contact pressure portion of which a contact pressure generated by pressing the clamp member thereto is higher than that of other portion.