SMA Prism Tilting Camera Module for High-Zoom Image Stabilization
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Solution Overview
Problem
The increasing size of image sensors and lenses in camera devices, particularly in mobile phones, necessitates improved optical image stabilization (OIS) for high magnification zoom, which existing technologies have not adequately addressed.
Innovation Solution
A camera device incorporating a prism tilting mechanism using Shape Memory Alloy (SMA) members to stabilize images by tilting a movable unit on multiple axes, driven by SMA wires and elastic members, with a ball and magnet system for guidance and stabilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement 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 weight increase
Solution Approach 1:
The camera device is divided into fixed and movable units, with the reflection member and holder forming a separate movable assembly that can be tilted independently. This segmentation allows the image sensor and lens to be optimized for quality while the stabilization function is handled by the separate movable unit, preventing weight increase in the main body.
Solution Approach 2:
The patent introduces a new degree of freedom by tilting the movable unit on multiple axes (first axis and second axis perpendicular to it) rather than only moving components along the optical axis. This dimensional change enables optical image stabilization without requiring larger or heavier components in the traditional focus adjustment direction.
2Reliability
If prism tilting is implemented for high magnification zoom OIS, then image stabilization is improved, but device complexity increases
Solution Approach 1:
The patent replaces traditional mechanical OIS mechanisms (such as voice coil motors or electromagnetic actuators) with SMA members that utilize shape memory alloy properties. When current is applied to the SMA members, they change shape and tilt the movable unit, providing a more compact and potentially simpler structure compared to conventional mechanical systems.
Solution Approach 2:
The movable unit serves multiple functions: it holds the reflection member for optical path bending, provides OIS through tilting on multiple axes, and enables high magnification zoom capability. This multi-functionality reduces the need for separate dedicated components, thereby reducing overall device complexity.
3Reliability
If SMA members are used to tilt movable unit on multiple axes, then OIS function is achieved, but manufacturing precision requirements increase
Solution Approach 1:
The patent introduces elastic members as intermediaries between the SMA members and the movable unit. These elastic members provide flexibility and tolerance compensation, reducing the stringency of manufacturing precision requirements for the rigid components while still enabling accurate tilting motion when SMA members are actuated.
Solution Approach 2:
The patent utilizes the phase transition properties of shape memory alloy materials, which change their physical state and dimensions in response to temperature or electrical stimulus. This material property allows for controlled, repeatable motion that can compensate for manufacturing variations, reducing the need for extremely tight tolerances in assembly.
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 SMA-driven prism tilting mechanism effectively stabilizes images during high magnification zoom, enhancing image quality by correcting for camera shake and tremors.
Implementation Method 1
an SMA member for moving the movable unit with respect to the fixed unit; and an elastic member electrically connected with the SMA member, wherein, 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
the camera device may further comprise 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 a housing, a holder located on the housing, an SMA member configured to move the holder with respect to the housing, an attraction member located on the housing, and a ball located between the holder and the attraction member, wherein the holder is configured to tilt with the ball serving as a pivot point.