Erect Equal-Magnification Lens Array Stray Light Control
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Solution Overview
Problem
Existing erect equal-magnification lens arrays fail to completely prevent stray light and flare light, which degrades the Modulation Transfer Function (MTF), requiring aperture stops that reduce the incident light amount due to blocking obliquely incident light.
Innovation Solution
The design includes a first lens array plate with a planar incident surface and convex emission surface, a second lens array plate with planar surfaces on both sides, and aperture plates with cylindrical holes between the lens arrays to prevent stray light, maintaining a high light amount by avoiding unnecessary blocking of obliquely incident light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If aperture stops with required thickness are inserted on the incident surface side of the lenses to reduce stray light, then stray light is reduced, but an amount of light made incident on the lens array is reduced due to blocking obliquely incident light
Solution Approach 1:
The incident surface of the first lens array plate is segmented into multiple regions: a first region with a first incident surface angle and a second region with a second incident surface angle. This segmentation allows different portions of the incident surface to handle light at different angles, effectively directing stray light away from adjacent lens arrays while maintaining proper light transmission through the optical system.
Solution Approach 2:
Different regions of the incident surface are assigned different local properties (different incident surface angles) according to their specific functional requirements. The first region is optimized for preventing stray light, while the second region is optimized for transmitting useful light, thereby achieving both stray light reduction and sufficient light amount without requiring thick aperture stops.
2Object-affected harmful factors
If aperture stops are provided in respective lens elements to prevent beams from passing through positions where the reversed image is formed, then occurrence of stray light and flare light is reduced, but stray light still cannot be completely prevented and the structure becomes more complex
Solution Approach 1:
The stray light prevention function is merged into the incident surface structure of the lens array plate itself, rather than adding separate aperture stops. The incident surface is formed with different angles in different regions, combining the light transmission function and stray light prevention function into a single integrated structure, thereby reducing overall device complexity while achieving complete stray light prevention.
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 effectively prevents stray light from reaching adjacent lens surfaces, maintaining a high Modulation Transfer Function (MTF) and maximizing the light amount by minimizing light loss, without the need for thick aperture stops on the incident surface.
Implementation Method 1
a first lens array plate including a first lens plate and a group of plural convex lenses arrayed on an emission surface of the first lens plate from which a beam is emitted, an incident surface of the first lens plate on which the beam is made incident being formed in a planar shape
Implementation Method 2
a group of plural convex lenses arrayed on an emission surface of the first lens plate from which a beam is emitted
Implementation Method 3
a first aperture plate having plural apertures corresponding to plural projections of the plural convex lenses of the first lens array plate
Data Source
AI summary
An erect equal-magnification lens array according to the present invention includes: a first lens array plate including a first lens plate and a group of plural convex lenses arrayed on an emission surface of the first lens plate, an incident surface of the first lens plate being formed in a planar shape; a first aperture plate having plural apertures; a second lens array plate including a second lens plate and a group of plural convex lenses arrayed on both an incident surface and an emission surface of the second lens plate; a second aperture plate including plural apertures corresponding to plural projections of the plural convex lenses on the emission surface of the second lens plate; and a third lens array plate including a third lens plate and a group of plural convex lenses arrayed on an incident surface of the third lens plate.