Wide-Angle Lens Segmentation for Cost Reduction
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Solution Overview
Problem
Existing wide-angle lenses for projection-type display apparatuses face challenges in achieving low cost while maintaining a wide angle and controlling lens diameter, leading to increased complexity and cost due to the need for multiple lenses and larger diameters, especially when coping with angles greater than 130° and varying engine specifications.
Innovation Solution
A wide-angle lens configuration comprising a projection lens positioned closer to the magnified side and a detachable relay lens positioned closer to the reduced side, with specific conditional expressions ensuring optimal field curvature and focal length relationships, allowing for a reduced lens diameter and cost-effective design by sharing the projection lens across different engines and replacing only the relay lens for varying specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a relay system with intermediate image is used to achieve long back focus and control lens diameter, then the back focus is extended and lens diameter is held, but the number of lenses increases and system complexity increases
Solution Approach 1:
The optical system is divided into two functional modules: a projection lens unit and a relay lens unit. The relay lens unit can be detached and replaced independently, allowing the projection lens to be shared across different engines while only the relay lens needs to be changed for different back focus requirements. This segmentation reduces the number of lenses that need to be managed in each individual engine configuration.
Solution Approach 2:
The projection lens is designed to be universal and can be used with multiple different relay lens units to accommodate various engine specifications. This multi-functionality allows a single projection lens to serve different purposes with different back focus requirements, reducing the total number of lenses needed across the system while maintaining the ability to achieve long back focus when needed.
2Adaptability or versatility
If multiple kinds of wide-angle lenses are arranged to cope with engines having different specifications, then adaptability to different engines is improved, but cost increases and user burden increases
Solution Approach 1:
The projection lens is designed as a universal component that can work with multiple different relay lens units, each optimized for different engine specifications. This allows a single projection lens to serve multiple functions across different engine configurations, significantly reducing the need to manufacture multiple complete wide-angle lens systems and thereby reducing costs.
Solution Approach 2:
The system is segmented into a shared projection lens component and replaceable relay lens units. This segmentation allows the expensive projection lens to be reused across multiple engines, while only the relatively cheaper relay lens units need to be varied to accommodate different specifications, thereby reducing overall system cost while maintaining adaptability.
3Reliability
If aberrations are corrected in each lens portion with intermediate image interposed, then aberration correction performance is improved, but the number of lenses increases
Solution Approach 1:
The aberration correction function is segmented between the projection lens and the relay lens. Each component is optimized to correct specific types of aberrations, allowing effective aberration correction to be achieved with fewer total lenses compared to a system where every lens must independently correct all aberration types.
Solution Approach 2:
The relay lens unit is designed to work with the projection lens to provide combined aberration correction. By optimizing the interaction between these two components, the system achieves satisfactory aberration correction with a minimal number of lenses, avoiding the need for excessive lens elements in each individual component.
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 cost-effective wide-angle lens system with a wide angle of view while minimizing the number of lenses and lens diameter, effectively addressing the complexity and cost issues of existing systems by allowing the projection lens to be used in common across different engines and the relay lens to be replaced for specific specifications.
Implementation Method 1
a relay lens which is disposed closer to a reduced side than an intermediate image... an intermediate image is formed at a position conjugate to a reduced-side imaging surface, and this intermediate image is re-formed on a magnified-side imaging surface
Data Source
AI summary
The wide-angle lens consists of a projection lens which is disposed closer to a magnified side than an intermediate image, and a relay lens which is disposed closer to a reduced side than the intermediate image and is configured to be attachable and detachable to and from the projection lens, and satisfies the following Conditional Expressions (1) and (2)0<|FC/FC2|<0.2 (1)0.05<|FC2/f|<1 (2)