Camera Module Optical Stabilization With Fixed Image Sensor
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing camera modules with image stabilization mechanisms face high costs due to complex structures and circuit designs, and image quality deteriorates when using mirror-based stabilization, necessitating a solution that balances cost and imaging quality.
Innovation Solution
A camera module design featuring a long-focus lens with a first optical element that rotates for image stabilization, eliminating the need for a drive mechanism on the photosensitive element, and incorporating convex and concave surfaces to enhance aberration compensation and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If image stabilization is implemented through movement of a photosensitive element, then image stabilization function is achieved, but device complexity and cost increase due to complex drive mechanism structure and circuit design
Solution Approach 1:
Instead of moving the photosensitive element to achieve image stabilization, the patent inverts the approach by moving the first optical element (lens group) while keeping the photosensitive element fixed. This reversal of the conventional approach simplifies the drive mechanism and reduces circuit complexity while maintaining the image stabilization function.
Solution Approach 2:
The patent extracts the drive mechanism from the photosensitive element and relocates it to the first optical element. This separation allows the photosensitive element to remain stationary with simpler connections, while the drive mechanism is concentrated in the optical element assembly, reducing overall system complexity.
2Device complexity
If image stabilization is implemented through movement of a mirror, then costs are reduced and drive mechanism is simple, but image quality deteriorates greatly and imaging quality is poor
Solution Approach 1:
The patent uses a lens group (first optical element) instead of a mirror for image stabilization. The lens group can be driven by a simple motor without compromising image quality, providing a cost-effective solution that maintains high imaging quality unlike mirror-based systems.
Solution Approach 2:
The patent changes the stabilization parameter from mirror angle adjustment to lens group position adjustment. By moving the first optical element along the optical axis or laterally, the system achieves image stabilization with maintained optical quality, avoiding the image degradation inherent in mirror-based approaches.
3Device complexity
If conventional image stabilization motor is used to drive first optical element, then costs are reduced and no drive mechanism is needed on photosensitive element, but module size may increase
Solution Approach 1:
The patent merges the drive mechanism for the first optical element with the existing lens barrel structure. The motor that drives the first optical element is integrated into the lens assembly, sharing space with other optical components, thereby avoiding additional volume increase despite the added stabilization functionality.
Solution Approach 2:
The drive mechanism for image stabilization is nested within the lens barrel structure. The motor and its components are housed within the existing optical assembly boundaries, utilizing unused or underutilized spaces within the lens barrel to accommodate the stabilization mechanism without significantly increasing overall module size.
4Area of stationary object
If photosensitive element with sensor diagonal greater than 10mm is used, then large target surface is achieved, but module size must be at least 32mm due to image stabilization drive mechanism space requirements
Solution Approach 1:
The patent inverts the conventional approach by stabilizing the optical path through first optical element movement rather than photosensitive element movement. This allows large photosensitive elements to be used without requiring additional space for complex drive mechanisms around the sensor, enabling module sizes below 32mm while maintaining large target surfaces.
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 design reduces module size, lowers costs, and improves imaging quality while enabling large target surfaces and high definition, achieving low-cost, miniaturized, and high-quality image stabilization.
Implementation Method 1
The first reflective surface changes a propagation direction of an optical axis from a first direction to a second direction
Implementation Method 2
the incident surface having a convex surface structure and the emergent surface having a concave surface structure are disposed on the first optical element
Data Source
AI summary
A camera module is provided, including a first optical element, a second optical element, and a photosensitive element that are arranged from an object side to an image side. The first optical element includes an incident surface, a first reflective surface, and an emergent surface that are arranged from the object side to the image side, a convex surface is provided at a paraxial axis of the incident surface, the first reflective surface is configured to change a propagation direction of an optical axis, and a concave surface is provided at a paraxial axis of the emergent surface. The second optical element includes at least one lens. In an image stabilization process of the camera module, the first optical element moves, and the photosensitive element remains fixed.