Anamorphic Objective Lens Aberration Correction
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Solution Overview
Problem
Contemporary anamorphic objective lenses produce significant residual optical aberrations, particularly chromatic aberration, which are less tolerable with the advent of digital cameras, while maintaining desired artistic characteristics like bokeh and field of view ratios, necessitating a cost-effective solution for aberration correction.
Innovation Solution
An anamorphic objective lens configuration comprising a negative spherical first lens group, an anamorphic second lens group with cylindrical surfaces, and a positive spherical third lens group, with an optical stop located within the third lens group, to achieve high aberration correction and maintain artistic imaging characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional anamorphic objective lens arrangement is used, then artistic imaging characteristics are maintained, but residual chromatic aberration becomes excessive for digital cameras
Solution Approach 1:
The lens is divided into three distinct lens groups (first anamorphic group, second anamorphic group, and third spherical group) with different optical functions. The first and second anamorphic groups primarily provide anamorphic imaging characteristics, while the third spherical group is specifically designed to correct residual chromatic aberrations, allowing each segment to optimize for its specific function
Solution Approach 2:
Different lens groups are assigned different optical properties: the first and second groups use anamorphic optical surfaces to produce artistic characteristics, while the third group uses spherical surfaces optimized for chromatic aberration correction. This local differentiation allows each component to excel at its specific task without compromising overall system performance
2Reliability
If aspherical and free-form shaped optical surfaces are added to correct optical aberrations, then imaging quality improves, but manufacturing complexity and cost increase
Solution Approach 1:
The third lens group uses spherical optical surfaces rather than complex aspherical or free-form surfaces. Spherical surfaces are simpler to manufacture with standard optical fabrication techniques, reducing manufacturing complexity and cost while still achieving effective chromatic aberration correction when combined with the anamorphic groups
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 solution reduces residual chromatic aberration, maintains a traditional bokeh shape, and provides different depths of field, while minimizing manufacturing complexity and cost, ensuring efficient imaging for both film and digital cameras.
Implementation Method 1
The anamorphic second lens group has at least one cylindrical surface in a first direction and at least a second cylindrical surface in a substantially perpendicular direction to the first direction
Data Source
AI summary
An anamorphic objective lens comprising, along an optical axis and in order from an object space to an image space: at least a negative (−) spherical first lens group; an anamorphic second lens group and a positive (+) spherical third lens group wherein an aperture stop is located before, after or preferably within the spherical third lens group such that the anamorphic objective lens creates a traditional elliptical bokeh of out of focus objects. Both spherical lens groups contain spherical refractive optical surfaces and the anamorphic lens group contains cylindrical and plano optical surfaces with at least one cylindrical surface oriented at substantially 90 degrees about at least one other cylindrical surface. The negative spherical first lens group may provide focusing.