Projection Optical System Aberration Control via Path Deflection
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Solution Overview
Problem
Existing projection optical systems face challenges in achieving wide-angle projection while minimizing distortion aberration and maintaining a compact size, often resulting in increased system length and manufacturing costs due to the need for larger lenses and more components.
Innovation Solution
A projection optical system comprising a first lens group with negative power, a second lens group with positive power, and a third lens group, along with optical path deflectors strategically placed between these groups, which satisfies specific conditional expressions to control distortion aberration and maintain a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If an intermediate image is formed to achieve wide-angle projection, then distortion aberration is suppressed, but the overall length of the optical system increases
Solution Approach 1:
The patent introduces an optical path deflector that redirects the optical path at an angle, effectively utilizing spatial arrangement in multiple dimensions. This allows the optical system to achieve wide-angle projection with reduced distortion aberration while maintaining a compact overall length by folding the optical path rather than extending it linearly
Solution Approach 2:
The patent employs a nested arrangement where the optical path deflector is integrated within the existing lens group structure. The deflector is positioned between lens groups in a way that utilizes the available space efficiently, allowing the system to maintain compact dimensions while incorporating the additional functional element needed for aberration correction
2Manufacturing precision
If larger lenses and more components are used to minimize distortion aberration, then image quality is improved, but manufacturing costs increase
Solution Approach 1:
The patent optimizes specific parameters of existing lens groups and introduces conditional expressions that define optimal ranges for focal lengths, distances between lens groups, and other critical parameters. This approach allows for effective distortion aberration correction using standard lens components within specified parameter ranges, avoiding the need for custom-designed large lenses and reducing manufacturing costs
Solution Approach 2:
The optical path deflector serves as an intermediary element that enables effective aberration correction without requiring larger or more complex lens groups. By introducing this intermediate component, the system achieves improved image quality while maintaining a cost-effective design using readily available optical components
3Length of stationary object
If the optical system is made more compact, then system size is reduced, but back focal length may become insufficient
Solution Approach 1:
The optical path deflector redirects light at an angle, effectively decoupling the system's physical length from its optical path length. This allows the back focal length to be sufficient for proper image formation while the physical footprint of the system remains compact, as the optical path is folded rather than extended linearly
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 effectively corrects distortion aberration, suppresses the increase in system size, and ensures a sufficient back focal length, allowing for a wider angle of view while maintaining image quality and reducing manufacturing costs.
Implementation Method 1
a first optical path deflector disposed in one of a position between the first lens group and the second lens group and a position between the second lens group and the third lens group, the first optical path deflector configured to defect an optical path
Implementation Method 2
a first lens group having negative power and including three negative lenses, a second lens group having positive power and including at least one positive lens, the second group lens disposed at a reduction side of the first lens
Data Source
AI summary
A projection optical system includes a first lens group having negative power and a second and third lens group having positive power, and a first optical path deflector disposed between two lens groups. The first lens group includes three negative lenses. The second lens group includes at least one positive lens. The third lens group includes a plurality of positive lenses. The three negative lenses of the first lens group are each a single lens. The third lens group includes a jointed lens including at least one of the plurality of positive lenses. f is a focal length of the entire project in optical system, d is a length between two lens groups where the first optical path defector is disposed, Dst is a distortion aberration at a reduction-side maximum image height, and the projection optical system satisfies Conditional Expressions (1) and (2) below:0.4<d/f<12.0 (1)−45%<Dst<−10% (2).