Photosensor Incident Angle Regulation for Detection Accuracy
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Solution Overview
Problem
Photosensors face reduced detection accuracy due to insufficient reduction in light intensity of wavelengths different from the designed specific wavelength emitted by the light emitting element, leading to unwanted light reaching the light receiving element.
Innovation Solution
Incorporating an incident light regulation portion, such as an etalon filter or dielectric multilayer film, that transmits light with incident angles less than a predetermined value and blocks light with angles greater than or equal to this value, ensuring only relevant light reaches the light receiving element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a diffraction grating is designed for light of a specific wavelength, then intensity of light at that specific wavelength is reduced, but intensity of light having different wavelengths cannot be appropriately reduced
Solution Approach 1:
The patent changes the parameter of light regulation from wavelength-based (diffraction grating) to incident angle-based (incident light regulation portion). By regulating light based on incident angle rather than wavelength, the system can effectively reduce unwanted light across all wavelengths while maintaining detection accuracy for the specific wavelength band.
Solution Approach 2:
The incident light regulation portion provides universal light regulation functionality across multiple wavelength bands. Unlike the diffraction grating that is optimized for a specific wavelength, the incident light regulation portion effectively reduces unwanted light from all wavelength bands radiated by the light emitting element, making the system versatile for different wavelength applications.
2Measurement precision
If a light emitting element radiates light of a wavelength in a predetermined band, then detection capability for that band is improved, but intensity of light of all wavelength bands cannot be sufficiently reduced
Solution Approach 1:
The patent changes the regulation parameter from wavelength-specific to incident angle-based. The incident light regulation portion uses incident angle as the control parameter to block unwanted light, which is effective regardless of the wavelength band, thereby reducing harmful light intensity while preserving detection accuracy.
Solution Approach 2:
The incident light regulation portion acts as an intermediary element between the light emitting element and the light receiving element. It mediates the light path by selectively blocking unwanted light based on incident angle, preventing harmful light from reaching the detector while allowing useful reflected light to pass through.
3Measurement precision
If a diffraction grating is used to reduce light intensity, then detection accuracy is improved, but the system becomes wavelength-specific and less adaptable
Solution Approach 1:
The patent simplifies the system by changing from a wavelength-specific parameter (diffraction grating designed for specific wavelength) to an angle-based parameter (incident light regulation portion). This parameter change eliminates the need for wavelength-specific design complexity while maintaining or improving detection accuracy across different wavelength 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
This configuration enhances detection accuracy by reducing unwanted light intensity, allowing for precise detection of objects even when the light emitting element radiates light within a predetermined band, thereby improving the signal-to-noise ratio and reducing manufacturing costs.
Implementation Method 1
an incident light regulation portion transmits light having an incident angle less than a predetermined value and blocks light having the incident angle greater than or equal to the predetermined value among light incident on the light receiving element
Data Source
AI summary
A photosensor includes a light emitting element that radiates light onto an object to be detected and a light receiving element that has a light-receiving surface for receiving light radiated from the light emitting element. An incident light regulation portion covering the light-receiving surface is provided on a path along which the light radiated from the light emitting element directed toward the light-receiving surface, and the incident light regulation portion transmits light having an incident angle less than a predetermined value and blocks light having the incident angle greater than or equal to the predetermined value among light incident on the light receiving element.