Folded Optical Axis Imaging Lens for Compact Zoom Design
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Solution Overview
Problem
Existing imaging optical systems face challenges in achieving a compact configuration with a wide angle of view and high optical performance, as they often require large lens diameters and increased system size due to the need for a movable lens group during zooming, which complicates miniaturization and aberration correction.
Innovation Solution
The proposed imaging optical system includes a relay-type configuration with a first and second lens group, where the second lens group is movable and incorporates reflectors to bend the optical axis, satisfying specific conditional expressions to control distortion, field curvature, and refractive power, thereby allowing for a compact design with improved aberration correction and reduced lens diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If a relay-type imaging optical system with a movable lens group is used to achieve zooming function and wide angle of view, then the angle of view is improved, but the entire lens length and lens diameter become large, making miniaturization difficult
Solution Approach 1:
The patent introduces a reflector that bends the optical axis by 90 degrees, changing the linear optical path into a folded configuration. This allows the light to travel through the lens system in a compact space by utilizing the third dimension (vertical space) rather than extending the lens length horizontally, thereby achieving wide angle of view without increasing the overall lens length.
Solution Approach 2:
The movable lens group is positioned within the second lens group, and the reflector is integrated into the lens group structure. This nested arrangement allows multiple optical components to share the same space, reducing the overall system size while maintaining the zooming function and wide angle of view.
2Adaptability or versatility
If a movable lens group is included to enable zooming function, then the versatility is improved, but the lens diameter increases, making the system size larger
Solution Approach 1:
By folding the optical axis with the reflector, the patent allows the movable lens group to achieve zooming function within a compact diameter. The bent optical path enables the lens elements to be arranged in a space-efficient configuration, reducing the required lens diameter while maintaining versatility.
3Adaptability or versatility
If the lens diameter is increased to accommodate the movable lens group mechanism, then the zooming function is achieved, but the system size increases, complicating miniaturization
Solution Approach 1:
The reflector bends the optical axis to utilize vertical space, allowing the zooming mechanism to be compact in the horizontal plane. This dimensional change enables the system to achieve versatile zooming function without increasing the overall system volume.
Solution Approach 2:
The movable lens group is nested within the second lens group, and the reflector is integrated into the existing structure. This nested configuration allows the zooming mechanism to share space with other optical components, reducing the total system volume while maintaining functionality.
4Length of moving object
If a reflector is inserted to bend the optical axis, then the lens length is reduced, but there is no room for the reflector in conventional configurations
Solution Approach 1:
The reflector is integrated into the second lens group, with its surface positioned at a specific distance from the lens element. This nested configuration allows the reflector to be accommodated within the existing lens group structure, reducing lens length without significantly increasing configuration complexity.
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 compact imaging optical system with a wide angle of view and high optical performance, effectively correcting various aberrations while maintaining a small size, suitable for projection display devices and imaging apparatuses.
Implementation Method 1
at least one of the first lens group or the second lens group includes a reflector that bends the optical axis
Data Source
AI summary
An imaging optical system consists of a first lens group and a second lens group, in order from a magnification side along an optical axis, an intermediate image is formed between the first lens group and the second lens group on the optical axis, at least one of the first lens group or the second lens group includes a reflector that bends the optical axis, the second lens group includes a movable lens group that moves during zooming, and predetermined conditional expressions are satisfied.