Optical Absorption Member for Ghost Light Suppression in Multiband Cameras
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Solution Overview
Problem
Conventional multiband cameras suffer from the occurrence of ghost light due to the high reflectance characteristics of interference filters, which leads to the generation of ghost images, a problem not adequately addressed in existing technologies.
Innovation Solution
An imaging apparatus is designed with a lens optical system, an image sensor, and an optical element array, where an optical absorption member with uniform absorptance across all wavelength bands is integrated to suppress ghost light by absorbing reflected light, thereby reducing ghost image formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If interference filters with high reflectance characteristics are used in the multiband camera, then the spectral filtering performance is improved, but ghost light is generated due to light reflection between band-pass filters
Solution Approach 1:
The patent converts the harmful reflected light (ghost light) into beneficial absorbed energy by introducing an optical absorption member. The absorption member has absorptance characteristics that are substantially uniform across all wavelength bands, which allows it to absorb the reflected light without generating additional ghost images, thereby eliminating the harmful effect while maintaining the spectral filtering performance of the interference filters
Solution Approach 2:
The optical absorption member acts as an intermediary element positioned in the optical path between the band-pass filters and the image sensor. This intermediary component absorbs the reflected light that would otherwise bounce between filters and create ghost images, mediating the interaction between the high-reflectance filters and the imaging system to prevent harmful effects
2Object-generated harmful factors
If an optical absorption member with uniform absorptance across all wavelength bands is introduced, then ghost light is suppressed, but the device complexity increases
Solution Approach 1:
The optical absorption member is designed with universal absorptance characteristics that are substantially uniform across all wavelength bands used by the multiband camera. This multi-functional property allows a single component to suppress ghost light for all spectral bands simultaneously, rather than requiring separate absorption members for each wavelength band, thereby limiting the increase in device complexity
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 suppresses ghost light and improves image precision by ensuring that reflected light is absorbed uniformly across all wavelength bands, resulting in high-precision imaging with minimal ghost images.
Implementation Method 1
an optical absorption member on which the part of the light that has passed through the first through nth optical regions and has been reflected by the imaging surface is incident
Data Source
AI summary
An imaging apparatus comprises a lens optical system including a lens and having first through nth optical regions (n is an integer equal to or greater than 2), an image sensor including pixel groups each including first through nth pixels, an optical element array disposed between the lens optical system and the image sensor and including optical components each guiding light that has passed through the first through nth optical regions to the respective first through nth pixels in each of the pixel groups, and an optical absorption member on which light reflected by the imaging surface of the image sensor is incident. The optical absorptance of the optical absorption member is substantially uniform across the entire wavelength bands of light that passes through the first through nth optical regions and is substantially uniform across the entire optical absorption member.