Optical System Lens-Group Ratios for Compact Aberration Correction
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Solution Overview
Problem
Existing optical systems face challenges in achieving a balance between correcting aberrations such as spherical aberration, coma aberration, field curvature, and distortion while minimizing the size and weight of the system.
Innovation Solution
The optical system is configured with a front lens group having positive refractive power, an aperture stop, and a rear lens group, adhering to specific conditional expressions to optimize the focal lengths and lens thickness ratios, ensuring appropriate aberration correction and system compactness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical system uses conventional lens configurations to correct aberrations, then aberration correction is improved, but the system size and weight increase
Solution Approach 1:
The patent applies parameter changes by optimizing the conditional expressions for focal length ratios (0.1 < ff/fr < 1.0) and thickness ratios (0.2 < tr/TL < 0.5). These parameter constraints enable aberration correction while controlling system weight, as the specific focal length and thickness relationships allow for more efficient optical design that reduces material requirements without sacrificing correction performance
2Reliability
If the optical system uses conventional lens configurations to correct aberrations, then aberration correction is improved, but the system length increases
Solution Approach 1:
The patent utilizes parameter changes through the thickness ratio constraint (0.2 < tr/TL < 0.5) which directly controls the distribution of lens materials along the optical path. This parameter optimization allows the system to achieve aberration correction with a more compact longitudinal arrangement, reducing total system length while maintaining the necessary optical power distribution for correction
Solution Approach 2:
The patent applies dimensionality change by optimizing the spatial distribution of lens elements in the longitudinal dimension through the thickness ratio parameter. By controlling how thickness is distributed relative to total length, the design achieves aberration correction in a more compact longitudinal footprint, effectively trading off dimensional distribution for reduced overall length
3Length of stationary object
If the optical system minimizes lens thickness to reduce size, then system compactness is improved, but aberration correction deteriorates
Solution Approach 1:
The patent resolves this contradiction through parameter changes by establishing the lower bound of the thickness ratio (tr/TL > 0.2). This parameter constraint ensures that sufficient lens material is present to provide the necessary optical power for aberration correction, while the upper bound (tr/TL < 0.5) prevents excessive thickness that would compromise compactness. The optimized parameter range achieves both goals simultaneously
4Length of stationary object
If the optical system increases lens focal lengths to reduce power, then system size is reduced, but aberration correction capability deteriorates
Solution Approach 1:
The patent applies parameter changes through the focal length ratio constraint (0.1 < ff/fr < 1.0) which optimizes the distribution of optical power between front and rear groups. This parameter relationship ensures that neither group has excessively long focal length that would reduce correction capability, while also preventing overly short focal lengths that would increase system size. The optimized ratio enables compact design with maintained correction 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 configuration allows for a smaller optical system with improved aberration correction, maintaining high optical performance and reducing the overall size and weight.
Implementation Method 1
a front lens group having a positive refractive power
Implementation Method 2
a rear lens group having a negative refractive power
Data Source
AI summary
An optical system of the present disclosure includes, in order from an object side, a front lens group having positive refractive power, an aperture stop, and a rear lens group. The optical system satisfies the following conditional expressions.0.1<ff /<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[LeftBracketingBar]"</annotation></semantics>fr<semantics definitionURL="">❘<annotation encoding="Mathematica">"\[RightBracketingBar]"</annotation></semantics><1.50.13<tr /TL<0.450.5<f/ TL<1.2where ff is the focal length of the front lens group; fr is the focal length of the rear lens group; tr is the sum of the central thicknesses of the lenses included in the rear lens group; TL is the total length of the optical system; and f is the focal length of the optical system.