Optical Projection Lens Groups With Over 9.5 mm Air Separation
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Solution Overview
Problem
The challenge lies in achieving high optical performance and low manufacturing costs simultaneously in optical projection systems, particularly in miniaturizing lens systems used in devices like DLP projection devices, while maintaining convenience and portability.
Innovation Solution
The optical projection system employs a first lens group with a negative focal power and a second lens group with a positive focal power, separated by a significant air gap, and includes specific design features such as concave surfaces and cemented lenses to balance focal powers and correct aberrations, thereby optimizing the lens structure for compactness and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the lens system is miniaturized to improve portability, then the device size is reduced, but manufacturing costs increase
Solution Approach 1:
The lens system is divided into multiple lens groups (first lens group with negative focal power, second lens group with positive focal power) separated by a significant air gap (greater than 9.5 mm). This segmentation allows each group to be optimized independently for compactness while maintaining overall system performance, resolving the contradiction between miniaturization and manufacturing complexity.
Solution Approach 2:
The patent introduces a large air gap dimension between lens groups along the optical axis, creating a three-dimensional spatial arrangement that allows compact lateral dimensions while maintaining adequate optical separation. This dimensional approach enables miniaturization without compromising manufacturing feasibility.
2Volume of moving object
If the lens system is miniaturized to improve portability, then the device size is reduced, but optical performance deteriorates
Solution Approach 1:
Different lens groups are assigned different focal powers (negative for first group, positive for second group) and specific optical characteristics tailored to their local functions. The negative lens group handles specific aberration correction while the positive lens group provides focusing, allowing each component to be optimized for its specific role rather than requiring a single large complex lens.
Solution Approach 2:
The system combines lens groups with different optical properties (different focal powers, different material compositions) to create a composite optical system. This composite structure achieves superior overall optical performance that cannot be obtained with a single lens, while maintaining a compact form factor.
3Reliability
If high optical performance is achieved, then imaging quality is improved, but lens system size increases
Solution Approach 1:
The lens groups are designed with movable capabilities along the optical axis, enabling dynamic adjustment of focus and aberration correction. This dynamic design allows a compact lens system to achieve high optical performance across different object distances without requiring a large fixed optical path.
Solution Approach 2:
The patent optimizes specific parameters including the air gap distance (greater than 9.5 mm between lens groups), focal power distributions, and lens curvatures to achieve high optical performance in a compact configuration. By carefully controlling these parameters, the system achieves superior imaging quality without increasing overall size.
4Reliability
If a large air gap is introduced between lens groups, then optical performance is improved, but device complexity increases
Solution Approach 1:
Multiple lens elements within each lens group are cemented together to form integrated units, reducing the number of separate components and simplifying assembly. This merging approach maintains the beneficial large air gap between groups for optical performance while reducing overall structural complexity.
Solution Approach 2:
The system is segmented into two main lens groups with a large air gap between them, creating a modular structure that simplifies design and manufacturing. Each segment can be independently optimized and assembled, reducing the complexity that would arise from a monolithic lens design.
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 achieves a balanced focal power distribution, reduces manufacturing costs, and enhances imaging quality by effectively correcting aberrations, resulting in a compact and high-performance optical projection system suitable for devices like projectors and illuminators.
Implementation Method 1
The optical projection system includes a first lens group with a negative focal power and a second lens group with a positive focal power... the negative lens group includes at least one lens with a negative focal power, and the positive lens group includes at least one lens with a positive focal power
Implementation Method 2
the negative lens group and the positive lens group are provided therebetween with a first air gap greater than 9.5 mm... effectively correcting aberrations
Data Source
AI summary
The present disclosure provides an optical projection system and an electronic device. The optical projection system includes from a zoom-in side to a zoom-out side: a first lens group and a second lens group sequentially arranged along an optical axis, and the second lens group has a positive focal power; the first lens group comprises a negative lens group and a positive lens group, the positive lens group is located closer to the zoom-out side than the negative lens group, the negative lens group comprises at least one lens with a negative focal power, and the positive lens group comprises at least one lens with a positive focal power; the negative lens group and the positive lens group are provided with a first air gap greater than 9.5 mm therebetween.