Elastic Support Structure for Directional Vibration Control
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Solution Overview
Problem
Existing vibration generating devices in portable information terminals and electronic devices experience unintended vibrations in the upward-downward direction due to sub resonance, which is not addressed by existing technologies.
Innovation Solution
A vibration generating device with a compact design that includes a movable body supported by an elastic support, which allows vibration in the forward-backward direction, and incorporates a buffer to suppress unintended upward-downward vibrations by using a projection and buffer to absorb rocking motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a movable body is vibrated by alternating electrical signals to a coil, then vibration in the leftward-rightward direction is generated, but unintended vibration in the upward-downward direction occurs due to sub resonance
Solution Approach 1:
An elastic support is introduced as an intermediary component between the movable body and the stationary body. This elastic support selectively transmits vibration in the intended leftward-rightward direction while filtering out and absorbing unintended upward-downward vibrations, thereby resolving the sub resonance issue without modifying the coil or movable body directly
Solution Approach 2:
The elastic support is designed with specific elastic properties and geometric parameters that allow it to differ in stiffness between different vibration directions. By adjusting the elastic modulus, shape, and dimensions of the elastic support, the system achieves directional vibration control - permitting leftward-rightward vibration while suppressing upward-downward vibration through parameter optimization
2Ease of operation
If the elastic support is designed to allow vibration in the forward-backward direction, then the intended vibration function is achieved, but structural complexity increases
Solution Approach 1:
The elastic support is segmented into distinct functional portions: a fixed portion attached to the stationary body, an upright portion providing vertical support, and an elastically deformable portion that allows controlled vibration. This segmentation enables each portion to be optimized for its specific function while keeping the overall structure manageable and manufacturable
Solution Approach 2:
The elastic support serves multiple functions simultaneously: it provides mechanical support for the movable body, enables intended vibration in the forward-backward direction, suppresses unintended vibration in other directions, and maintains structural stability. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity
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 device effectively vibrates in the intended forward-backward direction while minimizing unintended upward-downward vibrations, ensuring precise and controlled vibration feedback.
Implementation Method 1
an elastically deformable portion extending from the upright portion in a leftward-rightward direction
Implementation Method 2
A buffer is included between the projection and the stationary body
Data Source
AI summary
A vibration generating device includes a stationary body including a bottom surface, a movable body disposed in an upper space of the bottom surface, and an elastic support disposed between the stationary and movable bodies and configured to support the movable body to be vibratable forward and backward to the stationary body. The elastic support includes a fixed portion fixed to the bottom surface, an upright portion extending upward from the fixed portion, an elastically deformable portion extending from the upright portion leftward and rightward, and a movable-body-attaching portion that extends from the elastically deformable portion and to which the movable body is attached. The elastic support includes a projection extending from the upright portion leftward and rightward at a position different from a position at which the elastically deformable portion extends from the upright portion leftward and rightward. A buffer is included between the projection and the stationary body.