Telecentric Relay Imaging Optical System for Compact Projection Displays
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing imaging optical systems for projection type display devices face challenges in maintaining a wide angle of view while keeping the optical element diameter small, leading to increased size and manufacturing difficulties, especially when applied to larger image display elements.
Innovation Solution
The proposed imaging optical system configures a relay type system with multiple optical elements, forming two intermediate images and being telecentric on the reduction side, with specific constraints on the positioning and power of lens surfaces to optimize optical performance and reduce lens diameter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single intermediate image configuration is used, then the optical path is simplified, but the lens diameter increases and manufacturing becomes difficult
Solution Approach 1:
The optical system is divided into multiple stages with two intermediate images instead of one, segmenting the optical path to reduce the diameter of individual lenses while maintaining overall system functionality. This segmentation allows each lens to handle a smaller aperture, improving manufacturability.
2Force
If the magnification side optical element diameter is increased to accommodate diverging rays, then the angle of view is improved, but the apparatus size increases
Solution Approach 1:
The patent introduces a telecentric configuration on the reduction side, which changes the dimensional characteristics of the optical path. By making the system telecentric, the chief rays become parallel to the optical axis, allowing for a compact apparatus size while maintaining a wide angle of view through proper lens positioning.
Solution Approach 2:
The patent applies specific parameter constraints to the lens positions and powers, particularly positioning lenses to satisfy conditional expressions related to their distances from intermediate images. This parameter optimization allows the system to achieve both wide angle of view and compact size by precisely controlling the optical parameters rather than simply increasing component sizes.
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 achieves favorable optical performance with a small optical element diameter and wide angle of view, suitable for larger image display elements, while effectively correcting aberrations and reducing the size of the projection type display device.
Implementation Method 1
the imaging optical system forms a first intermediate image at a position conjugate to the magnification side imaging surface and a second intermediate image at a position closer to a reduction side than the first intermediate image
Implementation Method 2
the imaging optical system is configured to be telecentric on the reduction side
Data Source
AI summary
The imaging optical system forms a first intermediate image at a position conjugate to the magnification side imaging surface and a second intermediate image at a position closer to a reduction side than the first intermediate image on an optical path and conjugate to the first intermediate image. The imaging optical system consists of a first optical system, a second optical system, and a third optical system in order from a magnification side to the reduction side along the optical path. The imaging optical system is configured to be telecentric on the reduction side. The imaging optical system satisfies predetermined conditional expressions.