Pendulum Vibration Actuator Layout for Larger Stroke and Lower Noise
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Solution Overview
Problem
Existing vibration actuators face challenges in generating large vibrations while minimizing noise, due to the contact between the movable body and the buffer portion, which limits the swing stroke and increases noise.
Innovation Solution
A vibration generation device comprising a base, a pendulum supported by the base for swinging around a rotation axis, and a driving unit with a magnet and coil in non-contact configuration, where one member of the magnet and coil is positioned away from the rotation axis on the pendulum, and the base includes a support portion and an avoidance portion to prevent contact with the pendulum's free end.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If the movable body contacts the buffer portion to generate large vibration, then the vibration amplitude increases, but noise is generated and the swing stroke is limited
Solution Approach 1:
The patent replaces the mechanical contact-based buffer portion with a magnetic field-based driving unit. The coil and magnet interact through magnetic force to swing the pendulum without physical contact, eliminating the noise generated by mechanical impact while maintaining the ability to generate large vibrations through controlled magnetic attraction and repulsion.
2Force
If the movable body contacts the buffer portion, then vibration is transmitted to the housing, but the swing stroke cannot be increased
Solution Approach 1:
By replacing the mechanical buffer portion with a magnetic field-based driving unit, the patent removes the physical constraint that limited the swing stroke. The magnetic field can act over a distance, allowing the pendulum to swing through a larger arc without requiring physical contact points, thereby increasing the swing stroke while maintaining effective vibration transmission to the housing through the base.
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 configuration allows for increased pendulum stroke and vibration generation while preventing noise and resonance, enabling efficient vibration transmission to an object.
Implementation Method 1
a driving unit including a magnet 7A, and a coil 8A disposed to face the magnet 7A in a non-contact manner, and configured to swing the pendulum 5A
Implementation Method 2
a driving unit including a magnet 7A, and a coil 8A disposed to face the magnet 7A in a non-contact manner, and configured to swing the pendulum 5A
Implementation Method 3
a pendulum 5A supported by the base 4A swingably around a rotation axis Rx
Implementation Method 4
a base 4A configured to transmit vibration to an object
Data Source
AI summary
A vibration generation device includes: a base configured to transmit vibration to an object; a pendulum supported by the base swingably around a rotation axis; and a driving unit including a magnet, and a coil disposed to face the magnet in a non-contact manner, and configured to swing the pendulum. One member of the magnet and the coil is provided at a position on the pendulum away from the rotation axis. The base includes a support portion supporting the pendulum swingably around the rotation axis. A part of an extension surface of a facing surface of the support portion facing the pendulum is included in a swingable range of the pendulum. The support portion is provided outside the swingable range of the pendulum when viewed along the rotation axis.