Absorption Layer for Stray Light Control in Image Exposure
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Solution Overview
Problem
Existing image exposure devices suffer from image degradation due to stray light caused by reflections from collimation layers, leading to overexposure and blurring, especially in highly sensitive instant films.
Innovation Solution
An image exposure device is designed with a collimation portion to convert light into parallel light and an absorption layer with a light transmittance of 50% or less, reducing stray light by absorbing reflected light and minimizing its impact on the photosensitive recording medium.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a collimation layer is used to block unparallel light, then the necessity for a lens is removed, but stray light is generated due to light reflection from the collimation layer
Solution Approach 1:
An absorption layer is introduced as an intermediary component between the collimation layer and the instant film. This absorption layer mediates the harmful reflection from the collimation layer by absorbing the stray light before it reaches the instant film, thereby resolving the contradiction between simplifying the optical system and eliminating stray light.
Solution Approach 2:
The reflection from the collimation layer, which was previously a harmful source of stray light, is converted into a beneficial effect. The absorption layer absorbs this reflected light, and the absorbed energy is dissipated as heat, transforming the harmful stray light into a harmless thermal effect while protecting the image quality.
2Manufacturing precision
If the absorption layer has low light transmittance to reduce stray light, then image quality is improved, but exposure time may increase
Solution Approach 1:
The light transmittance of the absorption layer is optimized to a specific range (50% or less but not too low) to balance two competing requirements: reducing stray light sufficiently to maintain image quality while allowing enough light transmission to maintain reasonable exposure time. This parameter optimization resolves the contradiction between image quality and exposure time.
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 effectively reduces blurring and maintains image quality by ensuring a significant reduction in stray light, achieving a ratio of indirect to direct light exposure that prevents image degradation, even in highly sensitive films.
Implementation Method 1
an absorption layer that is provided between the image display device and the photosensitive recording medium support portion and has a light transmittance for the light from the pixels of 50% or less
Implementation Method 2
a collimation portion that is provided between the image display device and the photosensitive recording medium support portion and makes light from the pixels into parallel light
Implementation Method 3
the collimation portion is at least one selected from a slit, a fiber optic plate, a capillary plate
Data Source
AI summary
An image exposure device (10) includes an image display device (20) having a pixel (21), a photosensitive recording medium support portion that supports a photosensitive recording medium (40) in which an image of the image display device (20) is recorded in a state in which an exposure surface (40A) of the photosensitive recording medium (40) faces the image display device (20), a collimation portion (50) that is provided between the image display device (20) and the photosensitive recording medium (40) and makes light from the pixel (21) into parallel light, and an absorption layer (60) that is provided between the image display device (20) and the photosensitive recording medium (40) and has a light transmittance for the light from the pixel (21) of 50% or less.