Emission Optics for Uniform Illuminance in Optical Measurement
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Solution Overview
Problem
Existing optical systems for sample concentration measurement devices, such as those described in Patent Literature 1 and 2, fail to achieve uniform illuminance distribution in the irradiation surface of immunochromatographic test pieces, leading to uneven light application.
Innovation Solution
An irradiation optical system comprising a light source with a surface emitting element and a lens part to enhance directivity, a light shaping member to shape the light, and a first lens to form an image, with specific distance and aberration correction, along with a housing to facilitate handling and reduce stray light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If a beam is shaped into an elliptical or rectangular shape using a cylindrical lens or aperture, then the beam shape is improved for uniform color exhibition, but the illuminance distribution uniformity deteriorates
Solution Approach 1:
The optical system is divided into multiple functional components: a light source, a cylindrical lens for beam shaping, an aperture for rectangular shaping, and a diffuser for illuminance uniformization. Each component performs a specific function in the optical path, allowing the system to achieve both beam shape control and uniform illuminance distribution
Solution Approach 2:
A diffuser is introduced as an intermediary element between the beam shaping components and the immunochromatographic test piece. The diffuser scatters the shaped beam to create uniform illuminance distribution across the test piece surface, effectively mediating between the shaped beam and the measurement target
2Illumination intensity
If the distance between the light emitting surface and the light incidence surface is reduced, then the illuminance distribution uniformity is improved, but the light amount deteriorates
Solution Approach 1:
The system optimizes the distance parameter between the light emitting surface and the light incidence surface to be equal to or less than 26 times the size in one direction of the light emitting surface. This specific parameter range achieves the optimal balance between illuminance distribution uniformity and light amount, based on empirical findings
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 system achieves more uniform light irradiation and stable measurement by ensuring even illuminance distribution and reducing stray light, enhancing the accuracy of optical measurement devices.
Implementation Method 1
a lens part configured to enhance directivity of the first light emitted from the surface emitting element
Implementation Method 2
a light shaping member on which the first light emitted from the light source is incident via a light incidence surface and which shapes and emits the incident first light by a light passing hole
Implementation Method 3
a first lens configured to form an image of the first light emitted from the light shaping member on the object
Data Source
AI summary
An irradiation optical system configured to irradiate an object with first light includes: a light source including a surface emitting element emitting the first light from a light emitting surface; a light shaping member on which the first light emitted from the light source is incident via a light incidence surface and which shapes the incident first light using a light passing hole and emits the shaped first light; and a first lens configured to form an image of the first light emitted from the light shaping member on the object. A distance between the light emitting surface of the surface emitting element and the light incidence surface of the light shaping member is equal to or less than 26 times a size.