Variable Wavelength Interference Filter Vibration Control
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Solution Overview
Problem
Existing optical filter devices experience a reduction in resolution due to vibrations caused by adhesive stress and thermal expansion coefficient differences, leading to fluctuations in the gap between reflective films, which affects the interference filter's performance.
Innovation Solution
An optical filter device is designed with a movable section on one substrate that approaches and withdraws from the other, with a fixing member that adheres to the base section via a limited surface area, setting the one-dimensional resonance frequency of the fixing position to be less than or equal to half that of the movable section, and using an elastic fixing member to attenuate vibrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the interference filter is fixed via at least one location of one side of the substrate, then the adhesive stress and thermal expansion coefficient difference are reduced, but the interference filter vibrates centered on the fixing location when disturbed, causing gap dimension fluctuation and resolution reduction
Solution Approach 1:
The patent introduces a movable section that can dynamically adjust its position relative to the fixed section. This dynamic structure allows the interference filter to adapt to external disturbances without rigid fixation, preventing vibration-centered fixation while maintaining stable gap dimensions between reflective films, thus resolving the contradiction between adhesive stress resistance and resolution maintenance.
Solution Approach 2:
The patent changes the physical state of the substrate from completely fixed to partially movable. By controlling the degree of freedom of the substrate through the movable section design, the system maintains resolution while reducing the harmful effects of fixation. The movable section's controlled movement prevents gap dimension fluctuations caused by rigid fixation vibrations.
2Object-affected harmful factors
If the adhesive fixing surface area is reduced to minimize stress, then adhesive stress and thermal expansion effects are suppressed, but the fixing location becomes a vibration center that reduces resolution
Solution Approach 1:
The substrate is segmented into a fixed section and a movable section. This segmentation allows different parts of the substrate to have different degrees of freedom: the fixed section provides stable mounting with minimal adhesive stress, while the movable section absorbs vibrations and prevents them from propagating to the reflective films, thus maintaining resolution.
Solution Approach 2:
The movable section acts as an intermediary between the fixed section and the reflective films. It decouples the vibration transmission path, allowing the fixed section to minimize adhesive stress while the movable section prevents vibration-induced gap fluctuations that would reduce resolution.
3Measurement precision
If the one-dimensional resonance frequency of the fixing position is set to be less than or equal to half the value of the one-dimensional resonance frequency of the movable section, then resonance is suppressed and resolution is maintained, but the device complexity increases
Solution Approach 1:
The patent adjusts the resonance frequency parameters of the fixed and movable sections to specific relationships (fixing position resonance frequency ≤ half of movable section resonance frequency). This parameter optimization suppresses resonance interactions that would cause gap dimension fluctuations, maintaining resolution while managing the added design complexity through systematic parameter selection.
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 suppresses resonance and maintains the resolution of the interference filter, allowing for high-resolution light detection and processing in optical modules and electronic equipment.
Implementation Method 1
one-dimensional resonance frequency of the interference filter in which a fixing position of the fixing member is used as a fixed end is less than or equal to half a value of a one-dimensional resonance frequency of the movable section
Implementation Method 2
it is possible to reduce the stress from the adhesive in comparison to a configuration in which substantially the whole surface of the opposing surface of the substrate is adhered
Implementation Method 3
the stress which is generated by a thermal expansion coefficient difference between the substrate and the base substrate
Implementation Method 4
In the interference filter, reflective films which face each other via a predetermined gap are disposed on respective surfaces of a pair of substrates
Data Source
AI summary
A variable wavelength interference filter is fixed to the base, and the fixing material fixes at least one of the substrates to the base via at least one location of one surface side along a substrate thickness direction. A first order resonance frequency of the variable wavelength interference filter in which a fixing position of the fixing material is used as a fixed end is less than or equal to half a value of a first order resonance frequency of the movable section.