Piezoelectric Motor Electrode Terminal Projection Recess Contact
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Solution Overview
Problem
In electric devices, such as ultrasonic motors, the reduced contact area between electrode terminals and circuit substrates can lead to irregularities in contact resistance, affecting the performance and reliability of these devices.
Innovation Solution
The design includes an electrode terminal with a projection portion and a circuit substrate with a recess portion, where the Young's modulus of the projection portion is greater than that of the connected portion, allowing the projection to intrude and increase the contact area, reducing irregularities in contact resistance. Additionally, the use of materials like nickel and copper, and a gold plating layer can enhance this configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the vibrator is rendered small, then the size of the electric device is reduced, but the area of contact between the electrode terminal and the circuit substrate is decreased, causing irregularities in contact resistance
Solution Approach 1:
The invention applies local quality by creating a recess portion in the connected portion of the circuit substrate that specifically increases contact area at the electrode terminal interface. This localized structural modification ensures that even when the overall vibrator size is small, the critical contact region has enhanced surface area and improved electrical connection stability.
Solution Approach 2:
The invention transitions from a planar contact interface to a three-dimensional interface by forming a recess portion that receives the projection portion. This dimensional change allows the contact area to be increased vertically rather than requiring a larger horizontal footprint, enabling small device size while maintaining reliable electrical contact.
2Reliability
If the Young's modulus of the projection portion is greater than that of the connected portion, then the projection portion easily intrudes into the connected portion increasing contact area, but the structural complexity increases
Solution Approach 1:
The invention applies parameter changes by carefully selecting materials with appropriate Young's modulus values for the projection portion and connected portion. The projection portion uses a material with higher Young's modulus (e.g., nickel) that can elastically deform and intrude into the softer connected portion (e.g., copper), creating intimate contact surfaces without requiring complex mechanical structures.
Solution Approach 2:
The invention employs self-service by designing a system where the projection portion automatically intrudes into the connected portion through elastic deformation driven by the Young's modulus difference. This self-adjusting mechanism increases contact area without requiring external actuation or complex assembly procedures, maintaining simplicity while achieving reliable electrical contact.
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 effectively increases the contact area between the electrode terminal and the circuit substrate, reducing irregularities in contact resistance and improving the reliability and performance of electric devices like ultrasonic motors and piezoelectric actuators.
Implementation Method 1
the Young's modulus of the projection portion is greater than the Young's modulus of the connected portion... the projection portion easily intrudes into the connected portion
Implementation Method 2
the projection portion may include a gold plating layer on a surface thereof... occurrences of corrosion can be reduced
Data Source
AI summary
An electric device includes an electric component that includes an electrode terminal which includes a projection portion, and a circuit substrate that includes a connected portion which is electrically connected to the projection portion, in which the connected portion includes a recess portion that is in contact with the projection portion.