Vibration Device Sensor Placement for Normal Direction Detection
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Solution Overview
Problem
In tactile presentation devices, the integration of a press sensor to detect deformation in the normal direction often inhibits the vibration of the vibrating portion, as the sensor receives force in the same direction, causing interference with the vibrator's movement.
Innovation Solution
A vibration device design where the sensor is arranged around the vibrator in a plan view, ensuring they do not overlap, allowing the sensor to detect deformation in the normal direction without inhibiting the vibration by positioning the sensor to receive force without affecting the vibrator's movement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a press sensor is added to detect deformation in the normal direction, then the detection function is improved, but the vibration of the vibrator is inhibited
Solution Approach 1:
The sensor is positioned in the plane direction (XY plane) while detecting deformation in the normal direction (Z direction). This spatial separation allows the sensor to detect pressing operations without overlapping with the vibrator's movement path, thus preventing inhibition of vibration while maintaining detection capability.
Solution Approach 2:
The sensor acts as an intermediary element positioned around the vibrator rather than directly on it. This configuration allows the sensor to detect pressing forces transmitted through the housing or frame without directly interfering with the vibrator's motion, serving as a mediator between the pressing operation and the detection system.
2Measurement precision
If the sensor overlaps with the vibrator to detect pressing operations, then the detection accuracy is improved, but the vibrator movement is restricted
Solution Approach 1:
The sensor is arranged in the plane direction surrounding the vibrator, detecting forces in the normal direction. This three-dimensional arrangement allows the sensor to monitor pressing operations without occupying the same space as the vibrator's movement path, preserving full vibrational freedom while maintaining detection accuracy.
3Reliability
If the sensor is positioned to avoid overlapping with the vibrator, then the vibration is not inhibited, but the detection of deformation may be affected
Solution Approach 1:
The sensor detects deformation in the normal direction (Z axis) while being positioned in the plane direction (XY plane) around the vibrator. This dimensional separation ensures that the sensor does not physically restrict the vibrator's movement while still capturing pressing operation forces transmitted through the structure.
Solution Approach 2:
The sensor is designed to detect pressing operations through the housing or frame structure rather than requiring direct contact with the vibrator. This multi-functional approach allows the same sensor configuration to serve both vibration preservation and deformation detection purposes simultaneously.
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
Enables effective detection of deformation in the normal direction without hindering the vibration, ensuring the tactile feedback mechanism functions properly.
Implementation Method 1
the sensor includes a piezoelectric film 51
Implementation Method 2
the film 12 is deformed in a plane direction by a voltage being applied thereto
Data Source
AI summary
A vibration device that includes a vibration unit that has a vibrator which vibrates in a plane direction; and a sensor arranged on at least a portion of the vibration unit around the vibrator in a plan view of the vibration unit, and the sensor is constructed to detect a pressing operation in a direction normal to a pressing surface of the vibration device.