Optical Module Lever Mechanism for Wavelength Resolution
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Solution Overview
Problem
It is challenging to detect small changes in capacitance of the electrostatic actuator in Fabry-Perot interference filters, making it difficult to operate the mirror with high precision, especially as the wavelength resolution increases.
Innovation Solution
An optical module is designed with a semiconductor substrate, an electrostatic actuator, a first spring portion, and a second spring portion, where the movable portion of the actuator is connected to the first spring portion, and the optical component is connected between the first and second spring portions, with the first spring constant being smaller than the second, allowing precise control of the movement distance of the optical component.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the wavelength resolution of the Fabry-Perot interference filter is increased, then the precision of optical component operation is improved, but the difficulty of detecting small capacitance changes in the electrostatic actuator increases
Solution Approach 1:
The patent introduces a mechanical transmission mechanism consisting of a first lever and a second lever as intermediaries between the electrostatic actuator and the optical component. The first lever converts the small displacement of the actuator into a larger displacement at its other end, which then drives the second lever. This mechanical amplification system acts as an intermediary that transforms the difficult-to-detect small capacitance changes into larger, more easily measurable mechanical displacements of the optical component.
Solution Approach 2:
The patent changes the mechanical parameters of the transmission system by using levers with different arm lengths to create a mechanical advantage ratio. By adjusting the lever arm lengths, the system transforms the displacement parameter from the actuator to the optical component, amplifying the effective displacement while maintaining precise control. This parameter transformation allows the system to achieve high wavelength resolution without requiring direct detection of minute capacitance changes.
2Manufacturing precision
If the movement distance of the optical component is reduced to improve precision, then the control precision is improved, but the movement distance of the movable portion in the electrostatic actuator must be extremely small making detection difficult
Solution Approach 1:
The patent solves the contradiction by transitioning from direct linear motion to rotational motion through lever mechanisms. Instead of moving the optical component directly along the same dimension as the actuator displacement, the system uses levers to convert the actuator's linear displacement into rotational movement, which then drives the optical component. This dimensional transformation allows small actuator movements to produce precise optical component positioning without requiring the optical component itself to travel a similarly small distance.
Solution Approach 2:
The lever mechanisms serve as mechanical intermediaries that decouple the movement distance requirements of the actuator from those of the optical component. The first lever and second lever transmit and amplify the motion, allowing the actuator to move a small distance while the optical component achieves the desired precise positioning through the mechanical advantage provided by the lever system.
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 stable and precise operation of the optical component, improving the control precision of the mirror and increasing the wavelength resolution of the Fabry-Perot interference filter.
Implementation Method 1
an electrostatic actuator including a fixed portion fixed to the semiconductor substrate and a movable portion moved with respect to the fixed portion by an electrostatic force generated between the movable portion and the fixed portion
Implementation Method 2
a first spring portion connected to the movable portion and having a first spring constant; a second spring portion connected between the first spring portion and the semiconductor substrate and having a second spring constant greater than the first spring constant
Data Source
AI summary
An optical module includes a semiconductor substrate, an electrostatic actuator including a fixed portion fixed to the semiconductor substrate and a movable portion moved with respect to the fixed portion by an electrostatic force generated between the movable portion and the fixed portion, a first spring portion connected to the movable portion and having a first spring constant K1, a second spring portion connected between the first spring portion and the semiconductor substrate and having a second spring constant K2 greater than the first spring constant K1, and a movable mirror which is an optical component connected to a connection portion between the first spring portion and the second spring portion.