Variable Focus Imaging Lens for Compact Camera Stabilization
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Solution Overview
Problem
Conventional imaging lenses face challenges in reducing size while maintaining high performance due to the inclusion of a lens driving device of a voice coil motor type, which hinders miniaturization of camera modules.
Innovation Solution
An imaging lens design comprising a first to sixth lens configuration with a variable focus liquid lens, satisfying specific refractive and focal length conditions, allowing for auto-focusing and optical image stabilization without a voice coil motor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a lens driving device of voice coil motor type is used to perform auto-focusing and optical image stabilization, then the imaging function is improved, but the size of the camera module cannot be reduced
Solution Approach 1:
The patent removes the voice coil motor driving device from the optical system, extracting the bulky mechanical component that prevented miniaturization. Auto-focusing is achieved through a liquid lens that changes focal length via voltage application, and optical image stabilization is achieved through a moving lens group that can shift position without requiring a motor driver, thereby reducing camera module size while maintaining imaging functions
Solution Approach 2:
The patent replaces the mechanical voice coil motor system with a liquid lens system that uses electrical voltage to control focal length changes. The liquid lens eliminates the need for mechanical driving components, substituting electrical control for mechanical actuation, which enables camera module miniaturization while preserving auto-focusing capability
2Volume of moving object
If the camera module is miniaturized by removing the voice coil motor, then the size is reduced, but it becomes difficult to achieve both auto-focusing and optical image stabilization functions
Solution Approach 1:
The patent makes the lens group serve multiple functions: it performs both auto-focusing (by changing focal length through the liquid lens) and optical image stabilization (by moving the lens group to compensate for hand shake). This multi-functionality is achieved without requiring separate driving mechanisms, allowing a miniaturized camera module to maintain comprehensive imaging capabilities
Solution Approach 2:
The patent introduces a liquid lens with variable focal length that can dynamically adjust its optical properties through voltage control. This dynamic characteristic allows the lens to adapt between different focusing requirements and stabilization needs, enabling a compact design to achieve multiple functions that traditionally required larger, fixed-optics systems
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 miniaturized camera module with excellent aberration correction and functionality for auto-focusing and optical image stabilization.
Implementation Method 1
the fourth lens comprises a variable focus lens
Implementation Method 2
a first lens having positive refractive power; a second lens having negative refractive power; a third lens having refractive power
Data Source
AI summary
The present embodiment relates to an imaging lens including: a first lens having a positive refractive power, a second lens having a negative refractive power; a third lens; a fourth lens; a fifth lens having a positive refractive power; and a sixth lens having a negative refractive power, wherein the first to sixth lenses are sequentially arranged from an object side to an image side, the first to third, the fifth, and the sixth lenses are solid lenses, the fourth lens includes a variable focus lens, and the Conditional Expression 0.7<TTL/imgH<1 is satisfied.