Optical System With Segmented Relay Groups for Wide-Angle Projection
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Solution Overview
Problem
Existing optical systems for image projection and imaging apparatuses face challenges in achieving wide-angle projection with a short focal length and a wide screen while maintaining a compact size and weight, as they tend to be bulky and prone to tilting, which degrades optical performance.
Innovation Solution
An optical system with an intermediate imaging position conjugate to both magnification and reduction conjugate points, featuring a fixed magnification optical system and independently movable relay optical system with negative refractive power, allowing for reduced size and weight by minimizing the effective diameter of the lenses and simplifying the zoom mechanism.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the optical system uses a conventional wide-angle design with short focal length and wide screen, then the projection angle is improved, but the total length of the optical system increases and weight increases
Solution Approach 1:
The optical system is divided into two independent systems: a magnification optical system for the magnification conjugate point and a relay optical system for the reduction conjugate point. This segmentation allows each subsystem to be optimized independently, enabling wide-angle projection while reducing overall system weight and length compared to conventional unified optical systems.
2Volume of stationary object
If the optical system attaches a portion to the outside of the housing, then the internal space is improved, but the moment acting on the center of gravity causes tilting and degrades optical performance
Solution Approach 1:
The magnification optical system and relay optical system are merged into a single integrated optical unit with a shared housing and coordinated zoom mechanisms. This merging ensures proper weight distribution and center of gravity alignment, preventing tilting and maintaining optical performance while providing sufficient internal space for the complex mechanism.
3Adaptability or versatility
If the first lens has the largest diameter to achieve wide-angle, then the angle is improved, but the lens diameter and system size increase
Solution Approach 1:
The relay optical system employs multiple moving lens groups that are independently movable in the optical axis direction during zooming. The reduction side-closest moving lens group with negative refractive power dynamically adjusts to maintain wide-angle capability across the zoom range while keeping the effective lens diameter small, eliminating the need for consistently large-diameter lenses.
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 enables a wider angle and smaller diameter lens design, reducing the size and weight of the optical system and zoom mechanism, while maintaining high optical performance and correcting aberrations during zooming.
Implementation Method 1
the relay optical system includes a plurality of moving lens groups which are independently movable in an optical axis direction during zooming, and wherein the reduction side-closest moving lens group that is positioned closest to the reduction side among the plurality of moving lens groups has a negative refractive power
Data Source
Figure 1
Figure 2A~2C
Figure 3A~3C
AI summary
The present disclosure is directed to an optical system internally having an intermediate imaging position MI that is conjugate with both of a magnification conjugate point on a magnification side and a reduction conjugate point on a reduction side, including: a magnification optical system Op including a plurality of lens elements L1-L15 and positioned on the magnification side with respect to MI; and a relay optical system Ol including a plurality of lens elements L16-L28 and positioned on the reduction side with respect to MI, wherein the relay optical system Ol includes a plurality of moving lens groups G2-G5 which are independently movable in an optical axis direction during zooming, and wherein the reduction side-closest moving lens group G5 that is positioned closest to the reduction side among the plurality of moving lens groups has a negative refractive power.