Folded-Optics Camera OIS for High-Angle Shake Correction
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Solution Overview
Problem
Camera shake in handheld devices with folded optics, such as smartphones, reduces image resolution, especially for telephoto lenses, and existing image stabilization techniques are either impractical or require large image sensors.
Innovation Solution
An optical image stabilization (OIS) system that adjusts the angles between lens assemblies and the image sensor using actuators and detectors to compensate for camera shake, allowing for high-angle stabilization without a tripod or large sensors, comprising a first lens assembly, a mirror, and an image sensor with actuators that rotate the lens assemblies and mirror to correct pitch, yaw, and roll angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If folded optics with long focal length are used in handheld devices, then telephoto imaging capability is improved, but camera shake reduces image resolution
Solution Approach 1:
The patent implements dynamic adjustment of the optical path angle between the first and second optical axes. By making the angle adjustable rather than fixed, the system can adapt to different stabilization requirements and compensate for camera shake, thereby maintaining image resolution while preserving telephoto capability
Solution Approach 2:
The patent changes the optical configuration parameter by angling the second optical axis relative to the first optical axis. This parameter change enables the folded optics design to achieve telephoto imaging while incorporating image stabilization mechanisms to counteract camera shake
2Stability of the object's composition
If image stabilization is implemented to correct high-angle shake, then image stability is improved, but device complexity increases
Solution Approach 1:
The patent introduces a angular dimension to the optical path by angling the second optical axis relative to the first. This dimensional change allows the system to correct high-angle camera shake without requiring complex multi-axis stabilization mechanisms, as the angled configuration inherently provides stabilization capability
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
Achieves stable image quality with high-angle correction up to 5 degrees, comparable to a full field of view in tele cameras, while maintaining image quality without performance reduction.
Implementation Method 1
The mirror is configured to receive light from the first lens assembly and to reflect the received light toward the second lens assembly
Implementation Method 2
a first actuator configured to rotate the first lens assembly relative to the housing about a first rotation axis by a an angle α in response to the first signal and at the same time rotate the mirror about the first rotation axis by an angle α/2
Implementation Method 3
a second actuator configured to rotate a rotatable group of components relative to the housing about the second optical axis, wherein the rotatable group of components includes the first lens assembly, the mirror, and the second lens assembly
Data Source
AI summary
A camera for a portable electronic device is provided. The camera comprises a housing, a first lens assembly (101) having a first optical axis, a second lens assembly (105, 107) having a second optical axis, a mirror (103) placed at a point of intersection of the first and the second optical axis, and an image sensor (109) placed on the second optical axis. Furthermore, the camera comprises an image stabilisation apparatus, comprising a first detector configured to generate a first signal in response to a rotation of the camera about an axis that is perpendicular to both the first and the second optical axis and a first actuator configured to rotate the first lens assembly (101) and the mirror (103) in response to the first signal relative to the housing about a first rotation axis perpendicular to the first and second optical axis for compensating the rotation of the camera.