Polygon Mirror Surface Processing for Fan Beam Scanning
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Solution Overview
Problem
Conventional fan beam output devices require a cylindrical lens, increasing the number of components and space requirements, which complicates the formation of a fan beam for scanning applications.
Innovation Solution
A polygon mirror with reflection surfaces processed to form a fan beam without using a cylindrical lens, where each reflection surface is equipped with a refractive diffraction grating or surface processed parts to direct and spread the laser light, allowing for fan beam formation and scanning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cylindrical lens is arranged between the polygon mirror and relay lens to form a fan beam, then the fan beam can be properly formed and directed, but the number of components increases and more space is required
Solution Approach 1:
The patent combines the fan beam spreading function with the polygon mirror itself by processing specific reflection surfaces to have different inclinations. Instead of using a separate cylindrical lens to spread the beam, the mirror's reflection surfaces are designed with varying angles to directly produce the fan beam pattern, thereby merging two functions into one component and eliminating the cylindrical lens
Solution Approach 2:
The polygon mirror is designed to perform multiple functions: it not only reflects and directs the laser beam but also spreads it into a fan beam pattern through its specially processed reflection surfaces with different inclinations. This multi-functional design eliminates the need for separate components and simplifies the overall device structure
2Reliability
If a cylindrical lens is arranged between the polygon mirror and relay lens to form a fan beam, then the fan beam can be properly formed and directed, but the space required for the device increases
Solution Approach 1:
The patent merges the fan beam spreading function into the polygon mirror structure itself through differential inclination processing of reflection surfaces. This eliminates the need for a separate cylindrical lens and reduces the overall device volume, as the fan beam formation now occurs within the existing mirror component rather than requiring additional space for separate optical elements
3Reliability
If conventional fan beam output device structure is used with cylindrical lens, then stable fan beam output is achieved, but the device structure becomes complicated and costs increase
Solution Approach 1:
The patent combines the fan beam spreading function with the polygon mirror by processing specific reflection surfaces to have different inclinations relative to the optical axis. This merging of functions eliminates the cylindrical lens requirement, simplifies manufacturing, and reduces costs while maintaining stable fan beam output through the engineered reflection surface geometries
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 solution reduces the number of components and space needed, enabling a more compact and efficient fan beam output device capable of scanning without a cylindrical lens, improving operation efficiency and reducing costs.
Implementation Method 1
a surface processed part that reflects incident laser light to form a fan beam spreading in a predetermined direction
Implementation Method 2
each of the reflection surfaces is equipped with a refractive diffraction grating or surface processed parts to direct and spread the laser light
Data Source
AI summary
A polygon mirror includes a plurality of reflection surfaces formed in a circumference surface of the polygon mirror at equal intervals, and a surface processed part that reflects incident laser light to form a fan beam spreading in a predetermined direction, and the surface processed part being provided in each of the reflection surfaces.