Lens Drive Device Stabilization via Segmented Actuators
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Solution Overview
Problem
Existing lens drive devices face challenges in stabilizing the movement of movable objects during operation, leading to potential looseness and instability, which can result in unintended movements and contact with other components.
Innovation Solution
The lens drive device incorporates a design with X-axis and Y-axis actuators, movable objects, and a carrier actuator, along with holding portions and a carrier stopper mechanism, to stabilize the movement of these components by suppressing looseness and restricting unintended movement, using piezoelectric elements and friction engagement to ensure precise and stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional lens drive devices are used, then the structure is simple, but the movable objects cannot be stably moved and looseness occurs
Solution Approach 1:
The lens drive device is divided into multiple independent actuator assemblies, each responsible for driving a specific movable object (lens barrel, focus lens, shake correction lens). Each actuator assembly includes separate driving portions and holding portions, creating modular functional units that improve stability while maintaining manageable complexity through clear functional separation.
Solution Approach 2:
The holding portions are pre-configured to engage with the movable objects before driving forces are applied. This preliminary positioning ensures that movable objects are securely held in place before movement begins, preventing looseness and unintended movements during operation.
2Ease of operation
If actuators are used to drive movable objects, then movement function is achieved, but unintended contact with other components occurs
Solution Approach 1:
The holding portions act as intermediary elements between the actuators and the movable objects. These holding portions are specifically designed to guide and constrain the movement paths, ensuring that movable objects move only along intended trajectories and preventing unintended contact with other components during the driving process.
3Measurement precision
If friction engagement is used, then precise movement is achieved, but energy loss increases
Solution Approach 1:
Friction engagement is applied locally only at the contact surfaces between holding portions and movable objects, rather than throughout the entire drive mechanism. This localized friction provides sufficient precision for movement control while minimizing overall energy loss in the system.
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 stable movement of the X-axis and Y-axis movable objects and the lens carrier, preventing unintended contact and maintaining stability, thereby enhancing the operational reliability of the lens drive device.
Implementation Method 1
a lens drive device for driving a lens, includes a base member; an X-axis actuator configured to be provided in the base member and have an X-axis piezoelectric element expanding and contracting in an X-axis direction
Implementation Method 2
an X-axis movable object configured to be disposed to overlap the base member in the direction of the optical axis of the lens and have an X-axis friction engagement portion frictionally engaging with outer circumference of the X-axis drive shaft
Data Source
AI summary
An X-axis movable object holding portion to hold an X-axis movable object to be movable in an X-axis direction is provided at a position facing an X-axis actuator with an optical axis between the X-axis movable object holding portion and the X-axis actuator in a base member. A Y-axis movable object holding portion to hold a Y-axis movable object to be movable in a Y-axis direction is provided at a position facing a Y-axis actuator with the optical axis between the Y-axis movable object holding portion and the Y-axis actuator in the X-axis movable object. An auxiliary member supports a carrier actuator to move a lens carrier. In the lens carrier, a movement of the direction of the optical axis is regulated by a carrier stopper mechanism.