Low-Frequency Eccentric Vibrator for Quiet Erogenous Stimulation
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Solution Overview
Problem
Existing sex toys with electric motor drives generate high levels of noise and sound, causing acoustic and sensory irritations during use.
Innovation Solution
Designing the vibrator with a brush electric motor that operates in a frequency range of 10-40 Hz, uses voltage-dependent rotational speed constants of 600 rpm/volt to 240 rpm/volt, torque constants of 0.001 mNm/A to 50 mNm/A, and incorporates enclosures and control electronics to minimize noise, while employing a frequency-dependent sound perception model to reduce perceived loudness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a brush electric motor with high rotational speed is used to generate vibrations, then the vibration frequency increases, but the noise level and acoustic irritation increase significantly
Solution Approach 1:
The patent changes the operating parameters of the electric motor by selecting specific rotational speed constants (600-2400 rpm/volt at minimum voltage, 60-240 rpm/volt at maximum voltage) and torque constants (0.001-50 mNm/A) to operate in the 10-40 Hz frequency range, where the human ear perceives sound as softer by 10-60 phon compared to higher frequencies, thus reducing perceived noise while maintaining vibration function
Solution Approach 2:
The patent converts the harmful high noise perception at high frequencies into a benefit by operating at low frequencies (10-40 Hz) where the same sound pressure level is perceived as much softer by the human ear, effectively using human auditory perception characteristics to eliminate the harmful noise effect
2Length of moving object
If the motor diameter is reduced to 5-50 mm for compact design, then the device size decreases, but the torque and power output are limited
Solution Approach 1:
The patent selects motors with specific torque constants (0.001-50 mNm/A) that optimize the balance between size and torque output, enabling compact motors (5-50 mm diameter) to generate sufficient vibratory force through precise parameter selection rather than increasing size
Solution Approach 2:
The patent uses periodic vibration at low frequencies (10-40 Hz) driven by the compact motor, where the eccentric inertial mass creates oscillating forces that are sufficient for erogenous stimulation despite the small motor size, leveraging the periodic nature of vibration to achieve effective force output
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 vibrator operates softly and reduces noise perception, providing a more pleasant user experience by leveraging low-frequency vibrations and advanced electronics to manage sound levels.
Implementation Method 1
The motor via its shaft drives an inertial mass that eccentrically rotates in a rotational frequency range, as the result of which the vibrator vibrates in this frequency range
Implementation Method 2
the working oscillation frequency is in a range of f=10-40 Hz
Implementation Method 3
use is made of the frequency-dependent difference between the sound pressure level (units: dB) and the volume perceived by humans (units: phon)... at the same sound pressure level, at an absolute volume in the range of approximately 3-80 phon, the motor running in a frequency range f=10-40 Hz is perceived to be softer by 10-60 phon
Data Source
AI summary
Sex toy as a vibrator for erogenous stimulation, including an electric motor drive that rotationally drives at least one eccentric inertial mass. The inertial mass eccentrically rotates in a rotational frequency range, and therefore the vibrator vibrates in this frequency range and thus in its working oscillation frequency range. The diameter of the motor drive is between 5 mm and 50 mm. The vibrator is designed in such a way that during operation it is virtually acoustically imperceptible.