Vibration Actuator Extension Layout for Natural Frequency Tuning
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Solution Overview
Problem
Existing vibration actuators face challenges in maintaining stable performance due to variations in the difference between natural frequencies of bending vibration modes, which can be exacerbated by machining errors and reduced projection height, making it difficult to achieve consistent driving performance across individual units.
Innovation Solution
The vibration actuator design incorporates at least one pair of first extensions on long sides and at least one pair of second extensions on short sides of a rectangular elastic body, allowing for adjustment of natural frequencies by varying the extension lengths to maintain a predetermined difference, facilitating consistent performance even with reduced projection height.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the projection height is reduced to miniaturize the vibration actuator, then the actuator size is reduced, but the ability to adjust natural frequencies through machining is lost
Solution Approach 1:
The patent transitions from adjusting natural frequencies by machining the projection height (vertical dimension) to adjusting frequencies by machining the extension lengths in the horizontal plane. This dimensional shift allows frequency adjustment while maintaining low projection height, resolving the contradiction between miniaturization and manufacturing precision.
2Reliability
If machining is performed on projections to adjust natural frequencies, then frequency consistency is improved, but the projection height must be sufficient to allow machining
Solution Approach 1:
The invention moves the machining operation from the vertical dimension (projection height) to the horizontal dimension (extension length). This allows frequency adjustment while maintaining minimal projection height, simultaneously achieving reliability through frequency consistency and reducing the length constraint.
3Manufacturing precision
If individual vibration actuators have varying natural frequency differences, then tailored driving methods are required for each unit, but this increases system complexity and reduces productivity
Solution Approach 1:
The patent enables control of the natural frequency difference parameter through extension length adjustment. By providing a mechanism to tune this parameter during manufacturing, the invention ensures frequency consistency across units, allowing standardized driving methods and improving productivity.
Solution Approach 2:
The extension lengths are adjusted during the manufacturing process to pre-set the natural frequency difference within the target range. This preliminary action ensures frequency consistency before the actuators are deployed, eliminating the need for individual tailoring and enabling standardized operation.
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 design enables the vibration actuator to maintain stable driving performance by adjusting natural frequencies, ensuring the difference between modes falls within a predetermined range, even when projection height is minimized, thus enhancing the reliability and consistency of the actuator's operation.
Implementation Method 1
A piezoelectric element 505, which is an electromechanical energy transducer, is bonded to the vibrator 501
Implementation Method 2
The A-mode involves a second-order bending motion in a long-side direction
Implementation Method 3
The contact body and the projections are brought into press contact with each other... causes the contact body and the vibrator to move relative to each other
Data Source
AI summary
A vibration actuator includes a vibrator, a contact body, at least one pair of first extensions, and at least one pair of second extensions. The vibrator includes a rectangular elastic body and an electromechanical energy transducer. The contact body comes into contact with the rectangular elastic body and the contact body and the vibrator move relative to each other due to vibration of the vibrator. The at least one pair of first extensions is disposed on each of two long sides of the rectangular elastic body, and protrudes in a direction intersecting a long-side direction of the rectangular elastic body. The at least one pair of second extensions is disposed on each of two short sides of the rectangular elastic body, and protrudes in a direction intersecting a short-side direction of the rectangular elastic body.