Dual-Prism OIS Layout for Slim Camera Shake Compensation
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Solution Overview
Problem
Existing camera systems face challenges in accurately performing optical image stabilization (OIS) for dual prisms caused by camera shake, particularly due to trembling hands, which affects image quality and requires precise compensation of movement.
Innovation Solution
A prism apparatus with independently rotating dual prisms, each with its own actuator and hall sensor, allows for precise control of light reflection directions using control signals, enabling effective optical image stabilization by adjusting the angles of the prisms based on sensed movements, thereby stabilizing the image captured.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dual prism system is used for optical image stabilization, then image quality and stabilization accuracy are improved, but device complexity and thickness increase
Solution Approach 1:
The dual prism system is divided into two independent prism assemblies, each with its own actuator and control circuit. Each prism assembly can be controlled independently to compensate for different directions of camera shake, enabling precise optical image stabilization while maintaining modular architecture that simplifies the overall system complexity.
Solution Approach 2:
Each prism assembly serves multiple functions: it acts as both an optical element for light reflection and a stabilization element for compensating camera shake. The prisms are designed to perform both optical path routing and image stabilization compensation, reducing the need for separate components and thereby managing system complexity.
2Measurement precision
If independent actuators are added to each prism for precise control, then optical image stabilization performance is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into two independent control circuits, each dedicated to controlling one prism assembly. This segmentation allows for simplified individual control logic while achieving complex overall stabilization performance through the combination of both control systems working together.
Solution Approach 2:
The system incorporates feedback mechanisms where the control circuits receive information about camera shake and adjust the prism angles accordingly. This feedback-based control enables precise stabilization performance while keeping the control logic relatively simple through iterative adjustment rather than complex open-loop control.
3Length of moving object
If the prisms are arranged to intersect optical paths for slim design, then device thickness is reduced, but manufacturing precision requirements increase
Solution Approach 1:
Instead of relying solely on fixed mechanical alignment, the system uses active control through actuators to dynamically adjust prism positions and angles. This dynamic adjustment capability compensates for manufacturing tolerances and enables precise optical path intersection without requiring extremely tight manufacturing precision, thereby allowing for thinner device design.
4Adaptability or versatility
If dual prism with independent rotation is implemented, then optical image stabilization capability is improved, but device complexity increases
Solution Approach 1:
The dual actuator system is segmented into two independent units, each responsible for controlling one prism. This segmentation allows for simplified individual actuator designs while achieving versatile motion compensation through the coordinated operation of both actuators, managing overall system complexity.
Solution Approach 2:
Each actuator-prism combination serves as a universal stabilization unit that can compensate for various directions and types of camera shake. This multi-functionality is achieved through the independent rotation capability of each prism assembly, allowing the system to handle diverse stabilization requirements without needing separate specialized components.
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 enhances the accuracy of optical image stabilization, improves image quality by compensating for camera shake, and allows for a slim camera design with reduced thickness by intersecting the optical paths of the prisms, enabling efficient motion compensation regardless of optical zoom levels.
Implementation Method 1
a first prism configured to reflect input light toward a first reflected direction
Implementation Method 2
a second prism configured to reflect the light reflected from the first prism toward a second reflected direction
Implementation Method 3
a first actuator configured to change an angle of the first prism about a first rotation axis to change the first reflected direction based on a first control signal
Implementation Method 4
a second actuator configured to change an angle of the second prism about a second rotation axis to change the second reflected direction based on a second control signal
Data Source
AI summary
A prism apparatus, and a camera and an image display apparatus including the same are disclosed. The prism apparatus includes: a first prism configured to reflect input light toward a first reflected direction, a first actuator configured to change an angle of the first prism about a first rotation axis to change the first reflected direction based on a first control signal, a second prism configured to reflect the light reflected from the first prism toward a second reflected direction, and a second actuator configured to change an angle of the second prism about a second rotation axis to change the second reflected direction based on a second control signal.