Camera Module Lens Curvature for Compact Hand-Shake Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The miniaturization of camera modules in portable terminals leads to reduced space for hand-shake compensation units and decreased movement space of the optical imaging system, compromising image quality.
Innovation Solution
A camera module design with a specific lens configuration and hand-shake compensation unit that allows for miniaturization while maintaining sufficient space for the unit, including lenses with concave and convex surfaces and an inflection point, and adhering to specific distance and refractive power ratios.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the camera module is miniaturized, then the size of the camera module is reduced, but the mounting space for the hand-shake compensation unit and movement space of the optical imaging system decrease
Solution Approach 1:
The patent repositions the hand-shake compensation unit to be located behind the optical imaging system rather than beside it, utilizing the depth dimension (optical axis direction) to accommodate the compensation unit. This dimensional reorganization allows the camera module to maintain compact lateral dimensions while providing sufficient space for vibration compensation functionality.
2Volume of moving object
If the camera module is miniaturized, then the size of the camera module is reduced, but the movement space of the optical imaging system decreases
Solution Approach 1:
The patent enables the optical imaging system to move in the optical axis direction (depth dimension) for auto-focusing and hand-shake compensation, rather than being constrained to lateral movement only. This utilizes the Z-axis dimension for compensation movements, freeing up lateral space and enabling effective vibration compensation in a miniaturized form factor.
3Reliability
If lenses with inflection points and specific curvature ratios are used, then the optical performance and hand-shake compensation effectiveness are improved, but the lens design complexity increases
Solution Approach 1:
The patent specifies precise parameter ranges for lens design, including the inflection point position on the image-side surface of the rearmost lens and the curvature radius ratio between object-side and image-side surfaces (0.5 < R1/R2 < 2.0). These controlled parameter variations optimize optical performance and hand-shake compensation while maintaining manufacturability through quantifiable design criteria.
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 achieves a compact camera module with high resolution and sufficient space for hand-shake compensation, enabling effective image stabilization.
Implementation Method 1
an optical imaging system including a frontmost lens disposed closest to an object side, a rearmost lens disposed closest to an imaging plane, and at least one middle lens disposed between the frontmost lens and the rearmost lens
Data Source
AI summary
A camera module includes: an optical imaging system including a frontmost lens disposed closest to an object side, a rearmost lens disposed closest to an imaging plane, and at least one middle lens disposed between the frontmost lens and the rearmost lens. An image-side surface of the rearmost lens is concave and an inflection point is formed on the image-side surface of the rearmost lens. 0.2<D/TTL is satisfied, D being a shortest distance between the rearmost lens and the imaging plane, and TTL being a distance from an object-side surface of the frontmost lens to the imaging plane.