Lens Driving Device Column Portion Impact Absorption
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Solution Overview
Problem
Conventional lens driving devices face instability due to external impacts, which cause deformation of the case and subsequent direct impact on the movable element and piezoelectric actuator, disrupting stable movement of the lens unit.
Innovation Solution
Incorporating a first column portion that limits the moving range of the movable element and absorbs external impacts, preventing direct transmission to the piezoelectric actuator, thus stabilizing the movement by regulating the movable element's range and rotation without additional components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the case is made to accommodate the lens unit and piezoelectric actuator, then the device structure is compact and integrated, but the case deforms under external impact causing instability
Solution Approach 1:
The first column portion serves as an intermediary component between the case and the movable element. It absorbs external impacts through elastic deformation before these forces reach the movable element and piezoelectric actuator, thereby protecting the precision components while maintaining the compact integrated structure.
Solution Approach 2:
The first column portion is designed with elastic properties to provide beforehand cushioning against external impacts. By anticipating potential impact forces, the column portion is pre-configured to deform elastically and absorb these forces, preventing them from reaching and damaging the precision components inside the case.
2Device complexity
If the case directly accommodates the movable element, then the structure is simplified, but external impact directly transmits to the piezoelectric actuator causing deformation
Solution Approach 1:
The first column portion acts as a mediator between the case and the movable element. It provides a protective interface that absorbs impact forces through elastic deformation, preventing direct transmission of harmful forces to the movable element and piezoelectric actuator while maintaining relatively simple structural integration.
3Reliability
If additional components are added to protect against impact, then reliability under impact improves, but device complexity increases
Solution Approach 1:
The first column portion is designed to perform multiple functions simultaneously: it limits the moving range of the movable element, absorbs external impacts through elastic deformation, and provides structural support. This multi-functionality achieves improved impact resistance without adding separate protective components, thereby avoiding increased device complexity.
Solution Approach 2:
The impact absorption function is merged with the existing structural column portion that limits the movable element's range. By combining these functions into a single component with elastic properties, the design achieves enhanced impact protection without adding separate protective components or increasing overall device complexity.
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
The solution enables stable movement of the lens unit with resistance to external impacts, suppressing deformation of the case and piezoelectric actuator, ensuring consistent operation.
Implementation Method 1
a piezoelectric actuator having a piezoelectric element, and configured to move the movable element in a direction orthogonal to the direction of the optical axis of the lens by expanding and contracting the piezoelectric element
Data Source
AI summary
A lens driving device includes a first column portion rising from a base member toward a movable element side and configured to limit a moving range of the movable element moved by a piezoelectric actuator, and a case covering the base member so as to accommodate the movable element, the piezoelectric actuator, a lens carrier, and a column portion. The first column portion abuts on an inner surface of the case.