Reflective Module Two-Axis Rotation for Camera Shake Correction
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Solution Overview
Problem
Camera modules face challenges in reducing the F-number and preventing resolution deterioration during shake correction, particularly due to errors in optical path length changes during yaw-wise rotation.
Innovation Solution
A reflective module design that includes a first lens module, a holder with a reflective member, a guide member, and ball members to facilitate precise rotation about multiple axes, minimizing errors in optical path length and maintaining image resolution during shake correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a lens is disposed in front of the reflective member to enable two-axis rotation for shake correction, then shake correction function is improved, but optical path length accuracy deteriorates due to yaw-wise rotation errors
Solution Approach 1:
The rotation mechanism is segmented into two independent rotational stages: the guide member rotates about the first rotation axis (perpendicular to optical axis) relative to the housing, and the holder rotates about the second rotation axis (parallel to optical axis) relative to the guide member. This segmentation allows independent control of each rotation axis, enabling precise compensation of optical path length changes during yaw-wise rotation while maintaining shake correction functionality.
Solution Approach 2:
The guide member acts as an intermediary between the housing and the holder, mediating the rotational motion. It provides a stable reference frame for the holder's rotation while being controllable relative to the housing. This intermediary structure enables precise control of the optical path by decoupling the two rotation axes and allowing independent adjustment of each.
2Adaptability or versatility
If the reflective member rotates yaw-wise for shake correction, then shake correction in yaw direction is achieved, but aberration increases and resolution deteriorates
Solution Approach 1:
The system employs dynamic control of two independent rotation axes to adapt to different shake correction requirements. The guide member's rotation about the first axis and the holder's rotation about the second axis can be dynamically adjusted based on the direction and magnitude of shake, enabling precise shake correction while maintaining optimal optical path length and minimizing aberrations.
Solution Approach 2:
The system changes the rotational parameters (angles and speeds) of the two rotation axes dynamically during operation. By independently controlling the rotation parameters of the guide member and holder, the system can compensate for optical path length changes and maintain consistent image resolution across different yaw angles.
3Adaptability or versatility
If a two-axis rotation system is implemented for shake correction, then shake correction capability is improved, but device complexity increases
Solution Approach 1:
The complex two-axis rotation system is segmented into modular components: the guide member for first-axis rotation and the holder for second-axis rotation. Each module handles one rotation axis independently, simplifying the control logic and reducing the complexity of the overall system. This modular segmentation makes the system easier to manufacture, assemble, and maintain.
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 effectively prevents resolution deterioration during shake correction by accurately controlling the optical path length changes, allowing for improved image quality and reduced aberrations.
Implementation Method 1
a reflective member disposed on the holder to reflect light passing through the first lens module
Implementation Method 2
a first ball member, disposed between the guide member and the housing, including a plurality of balls spaced apart in a direction of a first rotation axis
Data Source
AI summary
A reflective module includes a holder on which a reflective member is disposed to reflect light passing through a first lens module; a guide member on which the holder is disposed; a housing accommodating the holder and the guide member; a first ball member, disposed between the guide member and the housing, including a plurality of balls spaced apart in a first rotation axis, perpendicular to the first optical axis; and a second ball member, disposed between the holder and the guide member, including a plurality of balls spaced apart in a direction of a second rotation axis perpendicular to both the first optical axis and the first rotation axis. The guide member is configured to rotate about the first rotation axis, together with the first lens module and the holder. The first lens module and the holder are configured to rotate together about the second rotation axis.