Vibration Wave Motor Nested Frictional Member for Compact Lens Drive
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Solution Overview
Problem
The existing linear translation type ultrasonic motors have a configuration where the guide portion and fixing member extend beyond the movable range, increasing the total length of the frictional and fixing members, which hinders miniaturization.
Innovation Solution
A vibration wave motor design featuring a vibrator with a piezoelectric element and a frictional member, where the frictional member is fixed using a recessed fixing member and a slider fixing material, allowing for relative movement and reducing the overall length by positioning the frictional member inwardly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the guide portion and fixing member extend beyond the movable range, then the frictional member can be securely fixed, but the total length of the frictional member and fixing member increases
Solution Approach 1:
The frictional member is nested within the recess of the fixing member, allowing the frictional member to be positioned inside the fixing member's structure rather than extending outward. This nesting arrangement secures the frictional member while minimizing the overall length in the movable direction, resolving the contradiction between fixing reliability and compact dimensions.
2Reliability
If the frictional member is positioned outward to ensure secure fixing, then the fixing is reliable, but the motor cannot be miniaturized
Solution Approach 1:
The frictional member is nested within the recess of the fixing member, allowing the frictional member to be positioned inside the fixing member's structure rather than extending outward. This nesting arrangement secures the frictional member while minimizing the overall length in the movable direction, resolving the contradiction between fixing reliability and compact dimensions.
3Reliability
If the guide portion extends beyond the movable range, then the guide function is adequate, but the overall device length increases
Solution Approach 1:
The guide portions are arranged in a radial direction perpendicular to the movable direction, rather than extending in the movable direction. This dimensional change allows the guide function to be provided without increasing the length in the movable direction, resolving the contradiction between adequate guide function and compact device length.
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 achieves a compact vibration wave motor with reduced dimensions while maintaining equivalent drive performance, as the frictional member is positioned inwardly, minimizing the length of the drive direction and allowing for efficient transmission of drive force to lens barrels.
Implementation Method 1
a vibrator that includes a piezoelectric element and a vibration plate
Data Source
AI summary
Disclosed is a vibration wave motor including: a vibrator provided with a piezoelectric element and a vibration plate; a frictional member having a frictional contact surface coming into contact with the vibrator; a fixing member having a recess to which the frictional member is fixed; and pressurizing unit that pressurizes the vibrator toward the frictional member, wherein the vibrator and the frictional member make relative movement using vibration generated from the vibrator, a fixing material for fixing the frictional member is provided between the frictional member and the fixing member, and the frictional member is fixed by coming into contact with the fixing member.