Offset Piezoelectric Sounder Module for Wearable Devices
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Solution Overview
Problem
Wearable devices with biological information obtainers and piezoelectric sounders face challenges in generating a suitable sound pressure level for notifications without reducing the sound pressure, often due to the proximity of the biological sensor and sounder, which can interfere with each other's functionality.
Innovation Solution
A module comprising a circuit board with a biological sensor, a piezoelectric sounder, and a cushion is designed where the center of the piezoelectric sounder's surface is offset from the circuit board's surface, allowing the sounder to vibrate effectively and generate a suitable sound pressure level while fixing the sensor in place without direct contact, thus minimizing interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the piezoelectric sounder is placed close to the circuit board to reduce device size, then the device achieves downsizing, but the sound pressure level is reduced and sensing accuracy is interfered with
Solution Approach 1:
The piezoelectric body is positioned asymmetrically relative to the circuit board, with its center offset from the circuit board's center. This asymmetric arrangement allows the sounder to be placed close to the circuit board for downsizing while avoiding direct interference with the biological sensor's sensing area, thus maintaining both compact form factor and functional reliability
Solution Approach 2:
The cushion is selectively positioned only between the piezoelectric sounder and the circuit board at specific locations where interference would occur, rather than uniformly throughout. This localized approach provides necessary isolation for sensor accuracy while allowing close proximity for downsizing, achieving both compactness and functional integrity
2Power
If the piezoelectric sounder is positioned to generate sufficient sound pressure, then notifications are effective, but the biological sensor accuracy is interfered with
Solution Approach 1:
A cushion is positioned between the piezoelectric sounder and the circuit board to act as an intermediary element. This cushion isolates the biological sensor from vibrations and electromagnetic interference generated by the sounder, allowing the sounder to operate at sufficient power levels without compromising sensor measurement precision
Solution Approach 2:
The cushion extracts or removes the harmful interference (vibrations and electromagnetic noise) from the path between the piezoelectric sounder and the biological sensor. By taking out this interfering element, the system can maintain high sound pressure levels while preserving sensor accuracy
3Manufacturing precision
If additional fixing components are added to secure the sensor and sounder, then positioning accuracy is improved, but device weight and complexity increase
Solution Approach 1:
The cushion serves multiple functions simultaneously: it acts as a fixing component to secure the piezoelectric sounder relative to the circuit board, provides isolation to maintain sensor accuracy, and enables close positioning for downsizing. By merging these functions into a single component, positioning accuracy is achieved without increasing device complexity or component count
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 configuration ensures a sufficient sound pressure level for notifications while maintaining accurate biological sensing, contributing to downsizing and weight reduction of the device by eliminating the need for additional fixing components and preventing interference between the sensor and sounder.
Implementation Method 1
a piezoelectric sounder that overlaps the circuit board and includes a piezoelectric body
Data Source
AI summary
A module includes a circuit board that is loaded with a biological information obtainer, a piezoelectric sounder that overlaps the circuit board and includes a piezoelectric body; and a cushion that is provided between the circuit board and the piezoelectric sounder. The piezoelectric sounder is arranged such that a center position of a surface of the piezoelectric body is offset from a center position of a surface of the circuit board.