Projection Optical System Wide Angle Miniaturization
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing projection optical systems fail to achieve high projection performance with a wide angle of view while maintaining miniaturization and effectively correcting various aberrations, as they often result in excessive lens sizes and distortion.
Innovation Solution
A projection optical system comprising a first optical system that forms an intermediate image, a reflective optical path bending means, and a second optical system with multiple lenses, where specific conditional formulae are satisfied to optimize lens distances and refractive powers, ensuring a wide angle of view and aberration correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the focal length is shortened to widen the angle of view, then the angle of view is increased, but the lenses toward the magnification side become excessively large
Solution Approach 1:
The projection optical system is divided into a first optical system and a second optical system separated by an intermediate image plane. This segmentation allows each subsystem to be optimized independently, enabling the second optical system to use smaller lenses while achieving a wide overall angle of view through the combination of both systems
Solution Approach 2:
The patent introduces an intermediate image plane as an additional dimensional element in the optical path. This allows the system to achieve wide-angle projection by combining two optical systems rather than relying on a single system with excessively large lenses
2Adaptability or versatility
If a fish eye lens is used in the second optical system, then the angle of view is widened, but distortion remains to a great degree in the final image surface
Solution Approach 1:
The patent specifies particular parameter ranges for the second optical system, including conditional formulas for focal length ratios and lens positioning. These parameter constraints ensure that the system achieves wide-angle projection while maintaining acceptable distortion levels, avoiding the excessive distortion characteristic of fish-eye lenses
3Manufacturing precision
If aberrations are corrected independently by the first optical system and second optical system, then each system can be optimized, but the angle of view cannot be widened to the required degree
Solution Approach 1:
The patent merges the aberration correction functions of both optical systems through coordinated design. The conditional formulas establish relationships between parameters of the first and second systems, ensuring that their combined aberration correction performance enables wider angle of view while maintaining image quality
4Area of stationary object
If an intermediate image is formed by the optical system, then the back focus of the second optical system can be shortened and lens diameters decreased, but the total length of the optical system increases
Solution Approach 1:
The formation of an intermediate image by the first optical system segments the overall optical path, allowing the second optical system to have a shorter back focus and smaller lens diameters. Although this increases total system length, it enables the use of smaller lenses which is the primary design objective
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 achieves high projection performance with a wide angle of view and miniaturization by optimizing lens configurations and aberration correction, enabling the projection of high-quality images at a wide angle.
Implementation Method 1
a first optical path bending means for bending an optical path with a reflective surface
Implementation Method 2
a first optical system constituted by a plurality of lenses that forms the image displayed by the image display elements as an intermediate image
Implementation Method 3
a second optical system constituted by a plurality of lenses that focuses the intermediate image on the magnification side conjugate plane
Data Source
AI summary
A projection optical system is constituted by, in order from the reduction side, a first optical system for forming an image displayed by image display elements as an intermediate image, a first optical path bending means that bends an optical path with a reflective surface, and a second optical system for forming the intermediate image on a magnification side conjugate plane. The second optical system is constituted by, in order from the reduction side, a first lens group having a positive refractive power, a second optical path bending means that bends an optical path with a reflective surface, and a second lens group having a positive refractive power. Conditional Formulae (1) and (2) below are satisfied.10.0<TL1/|f|<50.0 (1)4.0<TL21/|f|<30.0 (2).