Compact Optical System With Dual-Path Focusing for Aberration Correction
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Solution Overview
Problem
Existing optical systems struggle to achieve bright and favorable optical performance while maintaining a small size, particularly in photographic and video cameras, due to challenges in correcting aberrations such as coma and curvature of field.
Innovation Solution
An optical system comprising a front group, an intermediate group with two focusing lens groups moving along different trajectories, and a rear group with a negative lens closest to the image plane, adhering to specific conditional expressions to optimize focal lengths and back focal length ratios, ensuring proper aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the optical system uses conventional lens configurations, then the structure is simple, but the optical performance (brightness and aberration correction) deteriorates
Solution Approach 1:
The optical system is divided into three distinct lens groups (front group, intermediate group, rear group) with specific functional assignments. The intermediate group is further segmented into two focusing lens groups that move independently, allowing precise control over aberration correction while maintaining overall system performance.
Solution Approach 2:
The patent implements dynamic focusing by allowing the first and second focusing lens groups to move along the optical axis with different loci. This dynamic configuration enables the system to maintain optimal optical performance across different focusing distances, particularly when focusing on short-distance objects.
2Length of moving object
If the optical system is designed for compact size, then the length is reduced, but the optical performance (brightness and aberration correction) worsens
Solution Approach 1:
The patent optimizes specific parameter relationships within the lens groups, particularly the focal lengths of the focusing lens groups relative to the back focal length. By carefully controlling these parameters, the system achieves compact dimensions while maintaining the necessary optical performance for aberration correction.
3Reliability
If the focusing lens groups move with the same locus, then the structure is simple, but the aberration correction (especially for short-distance focusing) deteriorates
Solution Approach 1:
Different regions of the optical system are assigned different functional qualities. The first and second focusing lens groups have distinct movement characteristics tailored to their specific roles in aberration correction. This local differentiation allows each group to optimize its contribution to overall aberration correction, particularly for short-distance focusing.
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 system achieves bright and favorable optical performance with a compact design by effectively correcting spherical aberration, coma aberration, and curvature of field, even when focusing on short distances.
Implementation Method 1
an optical system, an optical apparatus and method for manufacturing the optical system... an intermediate group; and a rear group, which are arranged in order from an object side along an optical axis... a first focusing lens group having positive refractive power and a second focusing lens group having positive refractive power
Data Source
AI summary
An optical system (OL) comprises a front group (GA), an intermediate group (GM), and a rear group (GR). The intermediate group (GM) comprises a first focusing lens group (GF1) and a second focusing lens group (GF2). During focusing, the first focusing lens group (GF1) and the second focusing lens group (GF2) move along the optical axis on different trajectories from each other. The front group (GA) and the rear group (GR) are fixed in relation to an image plane (I). The rear group (GR) has a negative lens disposed closest to the image plane. The following conditional formula is satisfied.0.01< fF2/fF1<10.;0.5<Y/Bf<5..where,fF1: the focal length of the first focusing lens group (GF1),fF2: the focal length of the second focusing lens group (GF2),Y: the image height of the optical system (OL),Bf: the back focus of the optical system (OL).