Piezoelectric Element Support Frame with Twist Resilient Deformation
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Solution Overview
Problem
The existing supporting structure for piezoelectric elements in information display devices has poor assembly efficiency and significant displacement dispersion due to the need for pre-bonding of protruded members, which restricts the transmission of touch sense and vibrational displacement.
Innovation Solution
A twist resilient deformation structure is introduced, where strip-like piezoelectric elements are supported by surface-like holders with torsion resilient deformation, allowing for easy assembly and minimizing vibration displacement loss, using flexible printed wiring boards and double-sided adhesive tape for secure attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If protruded members are pre-bonded to piezoelectric elements, then assembly is completed, but assembly efficiency is poor and displacement dispersion is large
Solution Approach 1:
The supporting structure is divided into a frame body and separate protruded members. The protruded members are not pre-bonded to the piezoelectric elements, but are instead positioned on the frame body to support the piezoelectric elements from below, allowing for easier assembly and reduced displacement dispersion.
Solution Approach 2:
The frame body serves as an intermediary structure between the piezoelectric elements and the housing. The protruded members extend from the frame body to support the piezoelectric elements, mediating the connection and allowing for precise positioning without pre-bonding.
2Stability of the object's composition
If dot-like or linear protruded members are used, then piezoelectric element deformation is prevented, but bonding area is limited
Solution Approach 1:
The protruded members transition from dot-like or linear (1D/0D) structures to plate-like structures with surface area (2D). This dimensional change provides both the deformation control of restricted support points and the increased bonding area of surface contacts.
Solution Approach 2:
The protruded members are positioned at specific locations (both end portions of the piezoelectric element) to provide localized support that prevents deformation, while their plate-like structure provides sufficient bonding area at these critical locations.
3Measurement precision
If vibration displacement is minimized, then touch sense transmission is improved, but assembly complexity increases
Solution Approach 1:
The protruded members are merged with the frame body to form an integrated supporting structure. This combination simplifies assembly by reducing the number of separate components while maintaining the vibration displacement control necessary for precise touch sense transmission.
Solution Approach 2:
The protruded members are designed to automatically position and support the piezoelectric elements when assembled, eliminating the need for complex alignment procedures or additional fastening operations. The structure serves itself by providing both support and positioning functions.
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 solution enhances assembly efficiency, stabilizes vibration displacement, and reduces dispersion, allowing for precise vibration and displacement of piezoelectric elements without increasing the device thickness.
Implementation Method 1
When the user presses an operation surface 11 of the operation panel 10 with a finger, a voltage is generated across both ends of the piezoelectric elements E1 to E4, and it is possible to detect the operation force and the operation position by detecting and calculating the thus generated voltage.
Implementation Method 2
When the operation force of a magnitude larger than a predetermined threshold value is detected, a high frequency is supplied to the piezoelectric elements E1 to E4, whereby the operation surface 11 is vibrated.
Implementation Method 3
the respective strip-like piezoelectric elements are supported at their respective end portions by members having torsion resilient deformation structures which do not disturb the strip-like piezoelectric elements from being vibrated and displaced
Data Source
AI summary
An information display device (1A) comprises a touch panel (TP), an information display panel (LCD) located under the touch panel (TP) and four strip-like piezoelectric elements (E), which are caused to be vibrated and displaced by a pressing force generated when the touch panel (TP) is pressed, being disposed at the outer peripheral portion of the touch panel (TP), wherein both end portions of each strip-like piezoelectric element (E) are supported by surface-like holders (112A, 112B) with twist resilient deformation structures and a rotary shaft (113) so that each strip-like piezoelectric element (E) may not be disturbed from being vibrated and displaced. In this touch panel type information device, both end portions of a plurality of strip-like piezoelectric elements are supported by the supporting member having the holders with the twist resilient deformation structure which do not disturb both end portions of the strip-like piezoelectric elements from being vibrated and displaced.