Coaxial Illumination Lens Device for Multispectral Imaging
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Solution Overview
Problem
Current multispectral imaging techniques face challenges in capturing high-quality images due to interference and inefficient illumination, particularly in ensuring light is coaxial with the optical system to prevent total reflection and maintain image quality.
Innovation Solution
A lens device comprising a first optical member with aperture regions and optical filters, and a second optical member that emits illumination light coaxial with the optical system, positioned closer to the subject side to prevent light interference and ensure uniform illumination, along with a processor to generate images corresponding to different wavelength ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If illumination light is emitted from outside the optical system, then the illumination structure is simple, but the light is not coaxial with the optical system causing total reflection and image quality degradation
Solution Approach 1:
The second optical member emitting illumination light is nested within the optical system structure, specifically positioned closer to the subject side than the first optical member. This nesting allows the illumination source to be integrated into the optical system while maintaining coaxial alignment, resolving the contradiction between structural simplicity and image quality.
Solution Approach 2:
The second optical member acts as an intermediary component that bridges the illumination function and the imaging optical system. By positioning this intermediary element within the optical system and closer to the subject, it ensures coaxial illumination without requiring a completely separate illumination structure, thus maintaining both simplicity and reliability.
2Loss of information
If multiple optical filters are used to capture multispectral images, then spectral information is improved, but light interference and overexposure risk increase
Solution Approach 1:
Different aperture regions are assigned different optical filters with specific wavelength transmission characteristics. This local differentiation allows each region to capture specific spectral bands while the overall system maintains balanced illumination through the second optical member, reducing interference while preserving spectral information.
Solution Approach 2:
The system changes the wavelength parameter by using multiple optical filters with different transmission ranges in different aperture regions. Combined with the coaxial illumination from the second optical member, this allows selective spectral capture while maintaining consistent lighting conditions that prevent overexposure and interference.
3Reliability
If the second optical member is positioned closer to the subject side, then coaxial illumination is achieved, but the device structure becomes more complex
Solution Approach 1:
The second optical member serves multiple functions: it emits illumination light coaxial with the optical system, and its position closer to the subject side allows it to function as both an illumination source and a structural component of the optical system. This multi-functionality reduces the need for separate dedicated illumination components, 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 removes interference, ensures efficient light capture, and maintains image quality by providing coaxial illumination, allowing for accurate multispectral image generation with reduced risk of overexposure and improved image clarity.
Implementation Method 1
a second optical member that is provided outside the optical system and closer to a subject side than the first optical member and emits illumination light, which is incident from the outside of the optical system, to the subject side via the optical system
Implementation Method 2
a plurality of optical filters that are disposed in the plurality of aperture regions and include two or more optical filters transmitting lights having at least some wavelength ranges different from each other
Implementation Method 3
a plurality of polarizing filters that are disposed in the plurality of aperture regions and have different polarization directions
Data Source
AI summary
A lens device and an imaging apparatus that can emit illumination light coaxial with a lens optical system are proposed herein. A lens device includes an optical system that includes a first lens and a second lens forming an optical image of a subject; a first optical member that includes a frame that includes a plurality of aperture regions, a plurality of optical filters that include two or more optical filters transmitting lights having at least some wavelength ranges different from each other, and a plurality of polarizing filters that have different polarization directions; and a second optical member that is provided outside the optical system and closer to a subject side than the first optical member and emits illumination light, which is incident from the outside of the optical system, to the subject side via the optical system.