Transmission Optical Measurement Device With Open Support Paths
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Solution Overview
Problem
Existing transmission-type optical measurement devices face challenges in achieving high measurement accuracy due to light shielding and reduced light intensity caused by opaque support structures, which can degrade the quality of the measured products and limit the amount of incident light on the receiver.
Innovation Solution
The optical measurement device employs a conveyance device with a support portion that allows diffusely transmitted light to be detected without obstruction, using a lighting device that irradiates the object with measurement light of changing wavelength and a light receiving device that includes a condensing optical system to enhance light detection, thereby improving measurement accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If an opaque support means is used to support the product, then the product can be supported without cost increase, but the amount of object light incident on the light receiver decreases due to shielding
Solution Approach 1:
The support means is divided into multiple support portions, each with through holes. This segmentation allows the support structure to maintain mechanical strength while creating multiple light transmission paths, increasing the total amount of object light reaching the receiver without requiring a completely transparent expensive material.
Solution Approach 2:
The support means has different properties in different locations: opaque in most areas for structural support, but with transparent through-hole regions for light transmission. This local differentiation allows the support structure to simultaneously provide mechanical support and minimize light shielding in critical areas.
2Reliability
If the opening in the support means is narrowed to prevent product falling, then product safety is improved, but the amount of object light incident on the light receiver decreases
Solution Approach 1:
Instead of a single large opening, the support means has multiple smaller through holes. This segmentation maintains product support stability (preventing falling) while collectively providing sufficient light transmission area, as multiple small openings can match the area of one large opening while improving structural integrity.
3Illumination intensity
If the intensity of measurement light is increased to compensate for light loss, then the incident light intensity on the light receiver can be maintained, but the product quality may be degraded
Solution Approach 1:
The invention extracts and removes the light-blocking function from the support means by creating through holes. This eliminates the need to compensate for light loss by increasing measurement light intensity, thereby avoiding product degradation while maintaining sufficient light transmission for accurate measurement.
4Device complexity
If a transparent material such as glass is used for the support means, then no opening is required, but the transmittance cannot reach 100% and light is still reduced
Solution Approach 1:
The support means uses a porous structure with through holes instead of a solid transparent material. This porous design provides superior light transmission compared to solid glass, as the holes allow direct light passage without the absorption and scattering losses inherent in transparent materials, achieving near-100% transmittance in the hole regions.
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 enables more efficient utilization of light, preventing shielding and ensuring higher measurement accuracy by allowing greater amounts of diffusely transmitted light to be detected, particularly suitable for inspecting products with low transmittance.
Implementation Method 1
a light receiver that detects diffusely transmitted light emitted from a second surface of the object
Implementation Method 2
a light receiving device that includes a condensing optical system to enhance light detection
Data Source
AI summary
A conveyance device supports and conveys an object. The conveyance device has a support portion in which an opening narrower than the object is provided at a position where the object is supported. A lighting device irradiates a first surface of the object with measurement light having a wavelength changing over time through the opening of the support portion. A light receiving device detects object light that is diffusely transmitted light emitted from a second surface of the object.