Platter Supported Turntable Vibration Isolation
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Solution Overview
Problem
Conventional turntables suffer from motor-induced vibrations that degrade sound quality by propagating energy through the platter and base, leading to noise and distortion in musical signals, particularly in direct drive and belt drive types, which are not effectively mitigated by traditional heavy platter and base solutions.
Innovation Solution
A platter supported and driven turntable configuration where a lower platter is driven by rotational energy from a conventional turntable's platter through a spacer ring, with a tonearm assembly attached to a ballast or the turntable, creating a low-mass tonearm energy loop that suppresses motor vibrations and enhances sound clarity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a heavy platter and heavy base are used to reduce motor vibrations, then motor-induced vibrations are reduced, but the system stores and releases vibrational energies causing a heavy or dead sound signal
Solution Approach 1:
The patent extracts the harmful motor vibrations from the platter and base system by introducing a separate vibration isolation mechanism. The vibration isolation element is positioned between the motor and the platter, extracting vibrational energy before it can be stored in the heavy components, thus eliminating the echo effect while maintaining vibration reduction.
Solution Approach 2:
The patent introduces a vibration isolation element as an intermediary component between the motor and the platter. This intermediary absorbs and dissipates vibrational energy through constrained layer dampening, preventing the transmission of motor-induced vibrations to the platter and base, thereby resolving the contradiction between vibration reduction and avoiding vibrational energy storage.
2Object-affected harmful factors
If a belt drive system is used to filter motor vibrations, then motor noise is reduced, but the belt oscillates and stretches during loud passages dulling musical peaks
Solution Approach 1:
The patent eliminates the belt drive system entirely and replaces it with a direct drive mechanism combined with a vibration isolation element. This extraction of the belt component removes the oscillation and stretching problems while maintaining the vibration filtering function through the isolation element's constrained layer dampening capability.
Solution Approach 2:
The patent replaces the elastic belt mechanical system with a rigid direct drive mechanism combined with a vibration isolation element. This substitution eliminates the oscillatory behavior inherent in elastic belts while achieving the same vibration filtering objective through a different mechanical approach.
3Power
If direct drive is used for greatest instantaneous torque, then transient response and bass reproduction are improved, but motor noise level increases and couples into the music
Solution Approach 1:
The patent introduces a vibration isolation element as an intermediary between the motor and the platter in a direct drive system. This intermediary absorbs and dissipates motor-induced vibrations and noise through constrained layer dampening, allowing the system to maintain direct drive torque advantages while filtering out the harmful motor noise that would otherwise couple into the music.
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 configuration significantly reduces motor-induced vibrations, allowing for clearer and more transient sound reproduction by isolating vibration energy and dissipating it as heat through a constrained layer dampening system, resulting in improved sound quality.
Implementation Method 1
isolating vibration energy and dissipating it as heat through a constrained layer dampening system
Data Source
AI summary
A platter supported and driven turntable has a spindle, an upper circular platter, a lower circular platter, an arm board, and a tonearm assembly. The spindle is to rotate about a first direction. The spindle has a hub, a shaft and a bearing assembly between the hub and the shaft. The shaft has a flange. The upper circular platter is attached to the shaft of the spindle. The lower circular platter is attached to the flange of the shaft of the spindle. The arm board is attached to the hub of the spindle. The arm board has a first extension section, a mid-range section, and a second extension section. The mid-range section of the arm board is disposed between the upper circular platter and the lower circular platter. The tonearm assembly is directly attached to the first extension section of the arm board. The second extension section of the arm board is attached to a ballast or a supporting turntable through one or more adjustable height mounts.