Polygon Mirror Lightguide for Widthwise Laser Spot Distribution
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Solution Overview
Problem
Conventional light guide devices are unable to disperse the position of an irradiated area in the line width direction without moving the irradiation target, particularly when processing circular or point-shaped areas or reading information.
Innovation Solution
A light guide device comprising a first light guide part, a rotatable polygon mirror with multiple reflective surfaces forming a regular polygonal shape, and a second light guide part that reflects and guides the light to offset the optical axis in the rotation axis direction, allowing the irradiated area to be distributed in the width direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a conventional light guide device is used to irradiate a target, then the light can be directed to a specific point, but the irradiated area cannot be dispersed in the line width direction without moving the target
Solution Approach 1:
The polygon mirror is segmented into multiple reflective surfaces (first reflective surface, second reflective surface, third reflective surface) positioned at different locations in the rotation axis direction. Each reflective surface directs light to a different position in the line width direction, thereby dispersing the irradiated area without moving the target.
Solution Approach 2:
The reflective surfaces are arranged in the rotation axis direction (a dimension perpendicular to the scanning direction), which allows the irradiated area to be dispersed in the line width direction. This dimensional arrangement enables position distribution without mechanical movement of the target.
2Adaptability or versatility
If the position of reflective parts in the rotation axis direction differs, then the irradiated area position can be distributed, but the optical path length may vary
Solution Approach 1:
Each reflective surface is specifically positioned at a different location in the rotation axis direction to create local variations in the optical path. The first reflective surface, second reflective surface, and third reflective surface are arranged such that their respective optical paths are equalized, ensuring consistent optical path length despite different positions.
3Adaptability or versatility
If the optical axis is offset in the rotation axis direction, then the irradiated area can be dispersed in the width direction, but the focus point may shift relative to the workpiece
Solution Approach 1:
The polygon mirror rotates to bring different reflective surfaces into the optical path dynamically. As the mirror rotates, the first reflective surface, second reflective surface, and third reflective surface sequentially direct light to different positions in the line width direction, achieving both dispersion and consistent focus.
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
Enables the distribution of the irradiated area in the width direction without moving the irradiation target, enhancing processing efficiency and preventing process saturation by maintaining a consistent optical path length and adjusting the focus point relative to the workpiece.
Implementation Method 1
The first light guide part reflects and guides a light emitted from a light source
Implementation Method 2
The reflective part of the polygon mirror is configured to reflect the incident light so that the optical axis of the incident light is offset in the rotation axis direction
Implementation Method 3
The second light guide part reflects the light reflected by the reflective part of the polygon mirror and guides the light so that the light is irradiated to an irradiation target
Data Source
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AI summary
The light guide device (13) includes a first light guide part (20), a polygon mirror (30), and a second light guide part (40). The first light guide part (20) reflects and guides the laser light emitted from the laser generator (12). The polygon mirror (30) is configured to be rotatable and includes a plurality of reflective parts (33), the reflective parts (33) being arranged to form a regular polygonal reflective surface when viewed in a rotation axis (31) direction, the polygon mirror (30) reflecting the laser light guided by the first light guide part (20) by the reflective part while rotating. The second light guide part (40) reflects the laser light reflected at the reflective part (33) of the polygon mirror (30) and guides the laser light so that the laser light is irradiated to the workpiece (100) at each of the reflective parts (33). The reflective part (33) of the polygon mirror (30) is configured to reflect the incident laser light so that the optical axis of the incident light is offset in the rotation axis (31) direction. At least two reflective parts (33) differ from each other in position in the rotation axis (31) direction.