Folded Optical Imaging System with Reflective Member
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Solution Overview
Problem
Current portable terminal cameras with high-pixel image sensors face challenges in achieving optimal image quality due to limitations in lens design, particularly in miniaturizing optical imaging systems while maintaining long focal lengths and correcting chromatic aberrations.
Innovation Solution
The optical imaging system comprises a first lens group with positive refractive power and a second lens group, including multiple lenses with specific refractive indices and focal lengths, along with a reflective member to elongate the optical path, ensuring a total focal length greater than 10 mm and correcting aberrations through careful lens arrangement and Abbe number management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical imaging system is miniaturized to fit portable terminals, then the device size is reduced, but the focal length cannot be maintained at long distances
Solution Approach 1:
The patent introduces a reflective member (mirror) to change the optical path from a linear arrangement to a folded configuration. By reflecting light at an angle, the system achieves a longer effective focal length within a compact volume, resolving the contradiction between miniaturization and long focal length requirements.
Solution Approach 2:
The optical system is divided into multiple lens groups (first lens group with positive refractive power, second lens group with negative refractive power) separated by the reflective member. This segmentation allows each group to be optimized independently for specific functions while collectively achieving the desired focal length and compact size.
2Manufacturing precision
If multiple lenses are added to correct chromatic aberration, then image quality improves, but device complexity increases
Solution Approach 1:
Different lens groups are assigned specific optical characteristics: the first lens group has positive refractive power for converging light, while the second lens group has negative refractive power for diverging light. This local differentiation of optical properties enables targeted correction of chromatic aberration and other optical defects without requiring uniform complex structures throughout the entire system.
Solution Approach 2:
The system combines lenses with different refractive indices and Abbe numbers (first lens group with higher Abbe number for reduced chromatic aberration, second lens group with lower Abbe number for aberration compensation) to create a composite optical structure that achieves superior aberration correction through material diversity.
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 enables a compact optical imaging system with improved chromatic aberration correction and a long focal length, suitable for high-resolution image capture in portable devices, achieving a narrow angle of view and high image quality.
Implementation Method 1
a reflective member to elongate the optical path
Implementation Method 2
Each of the first lens group and the second lens group includes a plurality of lenses... One of the first lens and the second lens may have a positive focal length with an Abbe number greater than 50, and another may have a negative focal length with an Abbe number less than 30
Data Source
AI summary
An optical imaging system includes a first lens group, a reflective member, and a second lens group sequentially arranged along an optical axis. Each of the first lens group and the second lens group includes a plurality of lenses. The first lens group has positive refractive power. An effective diameter of a first lens, among the plurality of lenses in the first lens group, is largest among the plurality of lenses in the first and second lens groups, and 0<DL1P/TTL<0.25 is satisfied, where DL1P is a distance, on the optical axis, from an object-side surface of the first lens in the first lens group to a first surface of the reflective member, and TTL is a distance, on the optical axis, from the object-side surface of the first lens in the first lens group to an imaging surface.