Dual Prism Optical Image Stabilization for Slim Camera Design
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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 hand tremors, which affects image quality and requires complex lens movements that complicate slim camera design.
Innovation Solution
A prism apparatus with independently rotating dual prisms, each with its own actuator and hall sensor, adjusts angles based on control signals to compensate for movement, allowing for precise optical image stabilization and enabling a slim camera design by intersecting the prisms' optical paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dual prism is used for optical image stabilization, then image quality is improved, but device complexity increases
Solution Approach 1:
The optical image stabilization system is segmented into two independent prism units, each with its own actuator and control mechanism. The first prism handles stabilization in one direction while the second prism handles the perpendicular direction, dividing the complex stabilization task into manageable independent segments that can be controlled separately.
Solution Approach 2:
The prisms are designed to be rotatable about their respective rotation axes, allowing dynamic adjustment of the optical path in real-time. This dynamic capability enables the system to compensate for camera shake in multiple directions simultaneously, improving image stabilization effectiveness while maintaining a relatively simple overall structure.
2Reliability
If lens movement is used for optical image stabilization, then image quality is improved, but camera thickness increases
Solution Approach 1:
The patent replaces the traditional mechanical lens movement system with a rotational prism system. Instead of moving the lens assembly to compensate for camera shake, the prisms rotate about their axes to redirect the optical path, achieving the same image stabilization effect without requiring the space needed for lens movement mechanisms.
Solution Approach 2:
The stabilization mechanism transitions from one-dimensional lens movement to two-dimensional prism rotation. By allowing prisms to rotate about perpendicular axes, the system achieves stabilization in multiple directions simultaneously within a compact footprint, eliminating the need for thick lens movement mechanisms.
3Measurement precision
If dual prism rotation is implemented, then optical image stabilization accuracy is improved, but device complexity increases
Solution Approach 1:
The control system is segmented into independent control channels for each prism, with each actuator receiving and processing control signals independently. This segmentation allows for precise control of each prism's rotation angle and speed, improving stabilization accuracy while keeping the control architecture manageable through modular design.
Solution Approach 2:
The system implements feedback control where the rotation angles of both prisms are monitored and adjusted based on real-time performance requirements. Control signals are generated and applied to the actuators based on detected camera shake, creating a closed-loop system that continuously optimizes stabilization accuracy.
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
This solution enhances the accuracy of optical image stabilization, reduces the thickness of cameras, and improves image quality by compensating for camera shake without increasing the camera's size, enabling efficient motion compensation regardless of lens 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
Figure 1a
Figure 1b
Figure 2
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.