Optical Filter Lamination for Adhesion Stability
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Solution Overview
Problem
Existing optical filters with diagonally crossing boundaries are prone to peeling off due to external forces or aging degradation, affecting the accuracy of spectral data in diffraction grating spectral devices.
Innovation Solution
An optical filter design featuring a translucent substrate with a photodetecting part and a frame part, where the first optical filter layer covers the filter regions and frame, and the second optical filter layer is laminated on top, enhancing adhesion and preventing peeling, with optional additional layers for improved light blocking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the boundary between optical filter layers diagonally crosses the alignment direction of sensor pixels, then spectral characteristics are improved, but the end portions become acute and easily peel off due to external force or aging degradation
Solution Approach 1:
The patent extends the optical filter layers beyond the photodetecting part boundaries into the frame part, adding a dimensional extension that provides mechanical support and prevents peeling while maintaining the diagonal boundary configuration for spectral accuracy
Solution Approach 2:
The patent uses a composite structure combining the translucent substrate with optical filter layers that have different wavelength transmission characteristics, where the frame part provides structural reinforcement to prevent peeling of the acute end portions
2Measurement precision
If multiple optical filter layers are laminated to improve wavelength transmission characteristics, then spectral filtering performance is improved, but the complexity of the structure increases
Solution Approach 1:
The patent divides the optical filtering function into multiple segments by creating separate first and second optical filter layers with different wavelength transmission characteristics, allowing independent optimization of each layer while maintaining overall system functionality
Solution Approach 2:
The patent applies different optical filter characteristics to different regions (first optical filter layer for certain wavelength ranges, second optical filter layer for other wavelength ranges), optimizing the local quality of light transmission for specific spectral bands
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 design securely fixes optical filter layers, reducing peeling and maintaining spectral accuracy by increasing adhesion areas and smoothing edge transitions, thereby enhancing the stability and performance of the optical filter.
Implementation Method 1
An optical filter has a function of transmitting only light in a specific wavelength band and blocking light in other wavelength bands
Implementation Method 2
light in a certain wavelength band output from a light source is made incident on a sample, and light transmitted through the sample of the incident light is spectroscopically divided by a diffraction grating
Implementation Method 3
light transmitted through the sample of the incident light is spectroscopically divided by a diffraction grating
Data Source
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AI summary
An optical filter 2 is disposed on an image sensor 12 including a plurality of sensor pixels 12a which are aligned, and includes a elongated translucent substrate 4; a first optical filter layer 6 laminated on the translucent substrate 4, and a second optical filter layer 8 laminated on the first optical filter layer 6. The translucent substrate 4 includes a photodetecting part 4a which is long in the alignment direction X of the sensor pixels 12a and disposed on the image sensor 12; and a frame part 4b surrounding the photodetecting part 4a. The photodetecting part 4a includes a light transmitting region 41a on one side in the longitudinal direction of the photodetecting part 4a; a first filter region 42a adjacent to the light transmitting region 41a in the longitudinal direction of the photodetecting part 4a, and a second filter region 43a which is adjacent to the first filter region 42a in the longitudinal direction of the photodetecting part 4a and disposed on the side opposite to the light transmitting region 41a across the first filter region 42a. The first optical filter layer 6 covers the first and second filter regions 42a and 43a and the frame part 4b, and the second optical filter layer 8 covers the second filter region 43a and the frame part 4b.