Projection Lens Barrel Temperature Correction Mechanism
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Solution Overview
Problem
The projection lens barrel in projection display devices experiences a reduction in image quality due to changes in optical characteristics caused by temperature increases, which existing correction mechanisms fail to fully address as they primarily focus on focal length changes and neglect other optical characteristics.
Innovation Solution
A projection lens barrel with multiple lens groups, including a back focus correcting lens group and a field curvature correcting lens group, equipped with correction mechanisms that allow for individual movement along the optical axis to correct back focus and field curvature, respectively, thereby addressing the broader range of optical characteristic changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a correction mechanism is provided to move lens groups along the optical axis, then optical characteristics can be corrected to suppress reduction in image quality caused by temperature changes, but the device complexity increases
Solution Approach 1:
The correction mechanism is divided into multiple independent lens group correction mechanisms, with each mechanism responsible for correcting a specific lens group. This segmentation allows for targeted correction of different optical characteristics (back focus, field curvature) without requiring a single complex mechanism, thereby maintaining image quality while managing device complexity through modular design
Solution Approach 2:
The correction mechanisms are designed to handle multiple optical characteristics simultaneously. The same basic mechanism structure can correct different lens groups for different optical parameters (back focus and field curvature), making the correction system multi-functional and reducing overall complexity compared to having separate mechanisms for each correction type
2Reliability
If multiple lens groups are equipped with correction mechanisms to correct different optical characteristics, then comprehensive correction of temperature-induced optical changes is achieved, but the manufacturing complexity increases
Solution Approach 1:
The lens optical system is segmented into multiple lens groups (first through fifth lens groups), each with its own correction mechanism. This segmentation allows for independent manufacturing and assembly of each lens group-corsion mechanism unit, simplifying the overall manufacturing process compared to creating a single integrated correction system for all lens groups
Solution Approach 2:
Each lens group is equipped with a correction mechanism tailored to its specific optical characteristics and position in the optical path. The first lens group corrects back focus while the second lens group corrects field curvature, allowing for optimized local correction rather than a generic global correction system, which simplifies manufacturing by addressing specific local requirements
Data Source
AI summary
In order to provide a projection lens barrel and a projection display device that are capable of correcting the optical characteristics of a plurality of lens groups, a projection lens barrel, comprising a lens optical system causing light from an image display element to be formed as a projected image on a screen, also comprises correction mechanisms that move each of at least two lens groups along an optical axis and correct the optical characteristics to be corrected, said lens groups each having different optical characteristics for correction in order to suppress reduction in image quality of a projected image caused by changes in optical characteristics caused by temperature changes in the projection lens barrel.