Touch Panel Vibration Structure for Lower Resonance Haptics
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Solution Overview
Problem
Existing vibration devices with flat plate-shaped vibration parts tend to have high resonance frequencies, making it difficult to generate comfortable tactile feedback at lower frequencies.
Innovation Solution
A vibration device comprising a vibration part connected to an operation target through a support part and a vibration film, which extends across the vibration part and a fixing member in a tensioned state, allowing the vibration frequency to be lowered by incorporating the weight of the operation target.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a flat plate-shaped vibration part is used, then the device structure is simple and easy to manufacture, but the resonance frequency becomes high making it difficult to generate comfortable tactile feedback
Solution Approach 1:
The patent combines the vibration part with the operation target (touch panel) into a single integrated structure. The vibration part is formed integrally with the touch panel, eliminating the need for separate mounting and reducing overall system complexity while achieving the desired low resonance frequency through the combined mass of the touch panel and vibration part.
Solution Approach 2:
The patent utilizes the weight of the operation target (touch panel) as a counterweight to the vibration part. By making the operation target heavy relative to the vibration part, the overall resonance frequency is reduced to the comfortable range of 100-250 Hz, while the touch panel's weight serves as the counterbalancing mass.
2Weight of moving object
If the vibration part is made light, then the device is compact and responsive, but the resonance frequency increases reducing tactile feedback comfort
Solution Approach 1:
The patent merges the vibration part with the operation target to create a combined mass system. The vibration part maintains its light weight for compactness and responsiveness, while the operation target provides the additional mass needed to achieve the target resonance frequency range.
Solution Approach 2:
The operation target serves as a counterweight to the light vibration part. The weight relationship is specifically designed where the operation target is heavier than the vibration part, creating a system with resonance frequency in the comfortable tactile feedback range while preserving the vibration part's light weight advantages.
3Manufacturing precision
If the vibration part is connected to a heavier operation target, then the resonance frequency decreases providing comfortable tactile feedback, but the device complexity increases
Solution Approach 1:
The patent eliminates device complexity by merging the vibration part and operation target into a single integrated structure. The vibration part is formed as an integral part of the touch panel, removing the need for separate mounting mechanisms, fasteners, or additional structural elements that would increase device complexity.
Solution Approach 2:
The operation target serves multiple functions: it acts as the user interface for input operations, provides the counterweight mass for achieving desired resonance frequency, and serves as the structural support for the vibration part. This multi-functionality reduces the need for separate components and simplifies the overall device structure.
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 achieves a resonance frequency range of 100 to 250 Hz, providing comfortable tactile feedback by connecting the vibration part to a heavier operation target, such as a touch panel, thereby enhancing user experience.
Implementation Method 1
The piezoelectric film expands and contracts in a planar direction in response to voltage application
Implementation Method 2
a vibration film connected to the vibration part and the fixing member, extending across the vibration part and the fixing member in a tensioned state
Data Source
AI summary
A vibration device that includes: a vibration part having a flat plate shape and connected to an operation target on which a user performs a pushing operation; a fixing member; a support part connecting the vibration part and the fixing member; and a vibration film connected to the vibration part and the fixing member, extending across the vibration part and the fixing member in a tensioned state, and constructed to vibrate in a planar direction.