Camera Module Roll Actuator for Optical-Axis Shake Compensation
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Solution Overview
Problem
Existing camera modules struggle to compensate for shaking in the roll direction with the optical axis as a rotation axis, requiring additional actuators to rotate the image sensor and lens module.
Innovation Solution
A camera module design incorporating a first housing with a lens module, an image sensor, a second housing, and a driving portion, featuring a guide member with a spring or ball members that allow rotational movement about the optical axis, utilizing piezoelectric materials or shape memory alloy wires for driving, and magnets for precise rotation control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an OIS actuator moves the lens module perpendicular to the optical axis to compensate for shaking, then image stabilization in pitch and yaw directions is improved, but the ability to compensate for shaking in the roll direction deteriorates
Solution Approach 1:
The patent introduces a rotational driving portion that enables the first housing to rotate dynamically around the optical axis. This dynamic rotation capability allows the system to adapt to roll direction shaking by actively rotating the lens module and image sensor together, complementing the static OIS actuator's pitch and yaw compensation capabilities.
Solution Approach 2:
The patent combines the OIS actuator's pitch/yaw compensation function with a new rotational driving function in a single integrated system. The first housing now serves dual purposes: it is both the mounting structure for the lens module and the rotating assembly that compensates for roll direction shaking, eliminating the need for a separate actuator for roll compensation.
2Reliability
If an additional actuator is added to rotate the image sensor together with the lens module for roll direction compensation, then roll direction shaking compensation is improved, but device complexity increases
Solution Approach 1:
The patent merges the rotational driving function with the existing OIS actuator system by making the first housing itself the rotating component. The driving portion integrates the rotational actuation mechanism within the housing structure, and the guide member combines guidance and support functions, reducing the need for separate actuators and simplifying the overall system architecture.
Solution Approach 2:
The first housing is designed to serve multiple functions simultaneously: it accommodates the lens module, supports the image sensor, provides structural guidance through the guide member, and acts as the rotating assembly for roll compensation. This multi-functionality eliminates the need for additional dedicated actuators, reducing device complexity while maintaining roll direction compensation capability.
3Stability of the object's composition
If a guide member with a spring having greater thickness in the optical axis direction is used, then rotational movement guidance is improved, but module thickness increases
Solution Approach 1:
The spring is designed with non-uniform thickness, being greater in the optical axis direction where rotational guidance is needed and potentially thinner in other directions. This localized quality variation provides the necessary rotational stability and guidance while minimizing the overall thickness increase of the module, optimizing the balance between guidance stability and compactness.
4Measurement precision
If piezoelectric materials or shape memory alloy wires are used for rotational driving, then driving precision is improved, but manufacturing complexity increases
Solution Approach 1:
The patent replaces traditional mechanical rotational actuators with piezoelectric materials or shape memory alloy wires that convert electrical signals directly into precise rotational movements. This substitution eliminates complex mechanical gear systems and provides higher precision rotation control, though it introduces specialized material manufacturing requirements.
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 compensation for shaking in the roll direction, reducing module thickness and enhancing image stabilization by allowing the lens and image sensor to rotate around the optical axis, improving image capture stability.
Implementation Method 1
The driving portion may include at least one piezoelectric material disposed in the second housing
Implementation Method 2
The driving portion may include a plurality of shape memory alloy wires, and the plurality of shape memory alloy wires may be disposed to be symmetrical with respect to the optical axis
Implementation Method 3
the guide member includes a spring, and the spring has a greater thickness in an optical axis direction than in a direction perpendicular to the optical axis direction
Implementation Method 4
the guide member includes a plurality of ball members, and the plurality of ball members are disposed between surfaces on which the first housing and the second housing oppose each other in an optical axis direction
Data Source
AI summary
A camera module includes a lens module including at least one lens, a first housing accommodating the lens module therein, an image sensor disposed in the first housing, a second housing accommodating the first housing therein, a driving portion disposed in the second housing and configured to rotationally drive the first housing, and a guide member disposed between the first housing and the second housing. The guide member includes a spring, and the spring has a greater thickness in an optical axis direction than in a direction perpendicular to the optical axis direction.