Wide-Angle Lens With Optical Axis Deflection Prism
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Solution Overview
Problem
Existing wide-angle lenses used in projection display devices face challenges in achieving a balance between a wide angle of view, aberration correction, and reducing the size of the lens system and apparatus, while maintaining a long back focal length and telecentricity on the reduction side.
Innovation Solution
A wide-angle lens system is designed with a first optical system on the magnification side and a second optical system on the reduction side, incorporating an optical axis deflection prism that satisfies specific conditional expressions to achieve a compact size while maintaining aberration correction and a wide angle of view, by forming an intermediate image between the magnification and reduction sides.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a relay-type wide-angle lens is used to achieve a wide angle of view and correct aberrations, then the angle of view increases and aberration correction improves, but the total length of the lens becomes excessively long
Solution Approach 1:
The patent introduces an optical axis deflection prism that deflects the optical axis by 90 degrees, changing the dimensional arrangement of the lens system. This allows the lens to achieve a wide angle of view without proportionally increasing the total length by utilizing spatial reconfiguration rather than simply extending the optical path linearly
Solution Approach 2:
The optical axis deflection prism is integrated within the first optical system, nesting the deflection function inside the existing lens structure rather than adding it as a separate external component. This nesting approach minimizes the increase in total lens length while incorporating the necessary optical path modification
2Volume of moving object
If the focal length is shortened to achieve a wide angle of view, then the angle of view increases, but the size of the magnification side lens becomes excessively large
Solution Approach 1:
By deflecting the optical axis at 90 degrees within the first optical system, the patent reconfigures the spatial arrangement of optical components. This dimensional change allows for a more compact magnification side lens diameter while maintaining the wide angle of view, as the light path is folded rather than extending linearly
3Reliability
If a long back focal length is maintained to avoid thermal problems and ensure telecentricity, then thermal stability and telecentricity improve, but the lens system size increases
Solution Approach 1:
The optical axis deflection prism reconfigures the optical path in a perpendicular direction, allowing the back focal length to be maintained for thermal stability and telecentricity without proportionally increasing the overall lens system size. The folded optical path enables compact packaging while preserving critical optical parameters
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 allows for a compact wide-angle lens system that effectively corrects various aberrations and achieves a wide angle of view, reducing the overall size of the lens system and apparatus, while maintaining the necessary optical characteristics for projection display devices.
Implementation Method 1
the first optical system has an optical axis deflection prism which satisfies Conditional Expressions (1) to (3)... It has become necessary for such a type of the wide-angle lens to perform favorable aberration correction appropriate for the resolutions of light valves
Data Source
AI summary
The wide-angle lens forms an intermediate image at a position conjugate to a reduction side imaging plane and forms the intermediate image again on a magnification side imaging plane. The wide-angle lens includes: a first optical system on the magnification side; and a second optical system on the reduction side. The intermediate image is formed between the magnification side and the reduction side. The first optical system has an optical axis deflection prism which satisfies predetermined conditional expressions.