Fixed Focus Lens Curved Imaging for Video Conference Screens
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Solution Overview
Problem
Conventional projection systems using plane screens in video conferences lack in-situ feel due to mismatched imaging surfaces, leading to geometric distortion and reduced illumination when trying to project onto curved screens.
Innovation Solution
A fixed-focus lens system comprising a first lens group, a second lens group, and a free form reflective mirror is used to produce a curved imaging surface that coincides with a curved screen, reducing geometric distortion and increasing illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a conventional lens is used to project onto a curved screen, then the projection system can be compact, but the imaging surface does not coincide with the curved screen causing geometric distortion
Solution Approach 1:
The patent introduces a free form reflective mirror with a specifically designed curved surface to transform the planar imaging surface into a curved one that coincides with the curved screen. This curvature principle allows the imaging surface to match the screen geometry, eliminating geometric distortion while maintaining a compact projection system without requiring longer focal length lenses
2Manufacturing precision
If a projection lens with longer focus is adopted to match curved screen, then geometric distortion is reduced, but the projection distance is stretched and the system becomes too large
Solution Approach 1:
The patent replaces the traditional optical approach of using a long-focus lens to achieve curved field imaging with a reflective optical system. The free form reflective mirror substitutes for the extended optical path, achieving curved surface imaging in a compact configuration. This substitution of optical mechanism allows geometric distortion correction without increasing projection distance or system size
3Manufacturing precision
If signal processing method is used to correct geometric distortion, then the distortion image is corrected, but effective pixels are reduced and illumination is reduced
Solution Approach 1:
Instead of correcting geometric distortion through post-processing signal methods, the patent implements optical correction in advance through the free form reflective mirror. The mirror's surface geometry is pre-designed to produce an imaging surface that naturally coincides with the curved screen, preventing geometric distortion at the optical level. This preliminary optical correction avoids the need for signal processing that would reduce effective pixels and illumination
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 system generates a curved image with low geometric distortion, high effective pixel numbers, and high illumination by aligning the curved imaging surface with the curved screen, enhancing user experience and image quality.
Implementation Method 1
a free form reflective mirror (230) disposed in the light path between the second lens group (220) and the magnified side
Implementation Method 2
the second lens group (220) includes a first free form lens
Data Source
AI summary
A fixed-focus lens capable of imaging a light valve disposed at a reduced side onto a magnified side is provided. The fixed-focus lens includes a first lens group, a second lens group, and a free form reflective mirror. The first lens group is disposed in the light path between the reduced side and the magnified side. The second lens group is disposed in the light path between the first lens group and the magnified side and includes a first free form lens. The free form reflective mirror is disposed in the light path between the second lens group and the magnified side. An imaging surface imaged from the light valve by the fixed-focus lens is a curved surface. An imaging system using the fixed-focus lens is also provided.