SMA-Actuated Prism Tilting Camera for Two-Axis Stabilization
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Solution Overview
Problem
Existing camera devices face challenges in implementing high magnification zoom and optical image stabilization due to the increasing size of image sensors and lenses, requiring innovative structures for prism tilting.
Innovation Solution
A camera device utilizing an SMA member to tilt a movable unit on two perpendicular axes, coupled with an elastic member and a fixed unit, enabling prism tilting for optical image stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the size of image sensor and aperture are increased to enhance function and pixel count, then image quality is improved, but device size and complexity increase
Solution Approach 1:
The camera device is divided into fixed unit and movable unit, with the reflection member (prism) mounted on the movable unit. This segmentation allows the prism tilting mechanism to be isolated and controlled independently, enabling OIS function without requiring the entire camera assembly to be larger or more complex.
Solution Approach 2:
The reflection member is made movable rather than fixed, allowing it to tilt on the first and second axes. This dynamic capability enables the prism to correct image trembling through controlled movement, maintaining image quality without increasing overall device size.
2Reliability
If a prism tilting structure is implemented for high magnification zoom OIS, then optical image stabilization is improved, but device complexity increases
Solution Approach 1:
The tilting mechanism is segmented into independent first and second axes, allowing controlled movement in two perpendicular directions. This segmentation enables effective OIS for high magnification zoom while keeping each axis's control mechanism relatively simple and manageable.
Solution Approach 2:
The elastic member acts as an intermediary between the movable unit and the SMA member, providing mechanical coupling and support. This intermediary element simplifies the overall structure by using passive elastic components rather than complex active control mechanisms for each axis.
3Adaptability or versatility
If SMA member is used to tilt movable unit on two perpendicular axes, then prism tilting capability is improved, but control complexity increases
Solution Approach 1:
The SMA member replaces traditional mechanical tilting mechanisms with a material-based solution. The shape memory alloy's ability to change shape in response to temperature changes enables tilting on two perpendicular axes through thermal actuation, reducing mechanical complexity while improving adaptability.
Solution Approach 2:
The SMA member utilizes temperature as a control parameter to change its shape and thereby tilt the movable unit. By changing the thermal parameter rather than using complex mechanical controls, the system achieves versatile prism tilting capability with simpler control mechanisms.
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
Enables effective optical image stabilization through prism tilting, enhancing the camera's ability to correct image trembling and improve image quality during high magnification zoom.
Implementation Method 1
an SMA member for moving the movable unit with respect to the fixed unit... when a current is applied to the SMA member, the SMA member tilts the movable unit on the basis of a first axis and a second axis that is perpendicular to the first axis
Implementation Method 2
an elastic member electrically connected with the SMA member... the elastic member may be coupled to the movable unit and the SMA member may be coupled to the elastic member
Implementation Method 3
a ball interposed between the movable unit and the fixed unit and the ball may guide the movable unit to tilt on the basis of the first axis and the second axis with respect to the fixed unit
Implementation Method 4
a magnet disposed on the substrate, wherein the ball may be disposed on the magnet by being formed with a metal
Data Source
AI summary
A camera device including an actuating unit having a holder and a reflection member arranged in the holder. A fixed unit is spaced from the actuating unit. An SMA member is configured to move the actuating unit with respect to the fixed unit. An elastic member is electrically connected with the SMA member. In addition, when a current is applied to the SMA member, the SMA member tilts the actuating unit on the basis of a first axis and a second axis that is perpendicular to the first axis.