Lens Group Temperature Drift Reduction via Refractive Index Control
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Solution Overview
Problem
In multi-camera combined zoom systems, long-focus lens groups experience significant temperature effects, leading to increased power consumption and design difficulties for voice coil motors, which affect user experience.
Innovation Solution
A lens group design with a relative refractive index temperature coefficient between -9×10−5 and 9×10−5 is implemented, featuring specific lens arrangements and materials to minimize temperature effects and reduce voice coil motor complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the focal length of the lens group is increased to achieve long-focus capability, then the zoom ratio is improved, but the temperature effect becomes more obvious leading to increased power consumption and design difficulty
Solution Approach 1:
The patent changes the material parameter (refractive index temperature coefficient) of the lens to a specific range (-9×10^-5≤β≤9×10^-5) to reduce temperature sensitivity. This parameter optimization allows the lens group to maintain stable focal length under temperature variations, thereby reducing the stroke requirement for the voice coil motor and simplifying its design while preserving long-focus capability
2Reliability
If the stroke of the voice coil motor is increased to compensate for temperature effects in long-focus lens groups, then the focus compensation is improved, but the power consumption and design difficulty increase
Solution Approach 1:
The patent optimizes the refractive index temperature coefficient parameter of the lens material to fall within -9×10^-5≤β≤9×10^-5. This parameter change reduces the temperature-induced focal length drift, thereby decreasing the required stroke of the voice coil motor for effective focus compensation. The reduced stroke directly lowers power consumption while maintaining reliable temperature compensation performance
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 design reduces the temperature drift coefficient of the lens group, lowering the temperature effect and design difficulty for voice coil motors, thereby enhancing user experience and system efficiency.
Implementation Method 1
a first lens, a second lens, a third lens, a fourth lens, and a fifth lens that are sequentially arranged from an object side to an image side
Implementation Method 2
a focal length and a back focal length of the lens group change with a temperature. This is referred to as a temperature effect
Implementation Method 3
A refractive index changes with a temperature. A change of the refractive index with the temperature is represented by using the relative refractive index temperature coefficient β
Data Source
AI summary
A lens group is provided, which includes a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), and a fifth lens (L5) that are sequentially arranged from an object side to an image side, and a relative refractive index temperature coefficient β of at least one lens meets: −9×10−5≤β≤9×10−5. A temperature drift coefficient of the lens group falls within a small range, a temperature effect of the lens group is low, and a defocus phenomenon generated because the lens group changes with a temperature is weak. According to the application, a design difficulty of a voice coil motor in a lens can be reduced and user experience is improved.