Optical Filter Alignment Structure for Accurate Color Measurement
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Solution Overview
Problem
In existing color measurement apparatuses, the misalignment of the center axis of the opening portion in the casing with the center axis of the spectroscopic filter can lead to inaccurate measurement results due to the indirect placement of the spectroscopic filter, causing a reduction in the quantity of light incident on the filter.
Innovation Solution
A color measurement apparatus is designed with a substrate including an optical filter, a reduction portion, a frame, and a positioning section that maintains the relative position between the substrate and the frame, ensuring alignment even when the optical filter is not directly disposed in the frame, using a protrusion and fitting hole configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the spectroscopic filter is not directly disposed in the casing, then the device complexity is reduced and ease of manufacture is improved, but the alignment precision between the opening portion and the spectroscopic filter deteriorates, causing measurement precision to worsen
Solution Approach 1:
A substrate is introduced as an intermediary component between the casing and the spectroscopic filter. The substrate includes an opening that receives the spectroscopic filter and positioning sections that ensure accurate alignment with the opening portion in the casing. This mediator allows the filter to be indirectly disposed while maintaining precise alignment, resolving the contradiction between ease of manufacture and measurement precision.
Solution Approach 2:
The substrate is pre-formed with positioning sections (protrusions or recesses) that are designed to align with corresponding features in the casing before the spectroscopic filter is installed. This preliminary preparation of alignment features ensures that when the filter is mounted on the substrate, the optical axis is correctly positioned without requiring complex adjustment procedures during final assembly.
2Adaptability or versatility
If the center axis of the opening portion shifts from the center axis of the spectroscopic filter, then the device configuration becomes more flexible, but the quantity of light incident on the filter is reduced, worsening measurement precision
Solution Approach 1:
The substrate serves as a mediator that decouples the rigid alignment requirement from the flexible device configuration. The substrate can be positioned at various locations within the casing while its built-in positioning sections ensure that the spectroscopic filter remains properly aligned with the opening portion, regardless of the substrate's position within the casing.
Solution Approach 2:
The optical system is segmented into separate functional components: the opening portion in the casing, the substrate with positioning sections, and the spectroscopic filter. This segmentation allows each component to be optimized independently - the casing provides structural flexibility while the substrate ensures precise optical alignment, resolving the contradiction between configuration flexibility and measurement precision.
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 design effectively suppresses shifts in position between the reduction portion and the optical filter, maintaining accurate color measurement results by ensuring proper alignment and reducing light reflection, thus enhancing measurement accuracy.
Implementation Method 1
a substrate including an optical filter that processes light arriving from a measurement target
Implementation Method 2
a reduction portion that reduces a quantity of light heading toward the optical filter from the measurement target
Data Source
AI summary
A color measurement apparatus includes a substrate including an optical filter that processes light arriving from a measurement target, a reduction portion that reduces a quantity of light heading toward the optical filter from the measurement target, a frame that is a frame arranged to face the substrate and to which the substrate is fixed, and has a shape avoiding the optical filter and in which the reduction portion is positioned at a position facing the optical filter, and a positioning section that decides a relative position between the substrate and the frame in a direction intersecting with a center axis of the reduction portion.