Polygon Mirror Laser Scanning With Two-Axis Beam Condensing
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Solution Overview
Problem
Existing laser scanning devices may not sufficiently focus the laser beam in a predetermined direction due to the shape of the lens, leading to inadequate irradiation of the workpiece.
Innovation Solution
A laser scanning device comprising a first light guide part with a first condense component to reduce the beam diameter in one direction and a second light guide part with a second condense component to reduce the beam diameter in a perpendicular direction, ensuring a circular or near-circular cross-sectional shape of the laser beam is achieved by using a polygon mirror and cylindrical lenses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a single lens is used to focus the laser beam, then the device structure is simple, but the laser beam cannot be sufficiently focused in both directions, resulting in inadequate focusing performance
Solution Approach 1:
The optical system is segmented into two separate condensing components: a first condensing component (cylindrical lens) that focuses the laser beam in the vertical direction, and a second condensing component that focuses the beam in the horizontal direction. This segmentation allows each component to specialize in one dimension, achieving proper two-dimensional focusing that a single lens cannot provide.
Solution Approach 2:
The patent transitions from single-direction focusing to two-directional focusing by introducing the first condensing component with cylindrical geometry that operates in a specific dimension (vertical), while the second condensing component handles the perpendicular dimension (horizontal). This dimensional separation resolves the contradiction by enabling comprehensive focusing without requiring an overly complex single-component solution.
2Reliability
If the laser beam is not properly focused, then the optical system is simpler, but the processing accuracy on the workpiece deteriorates and optical components may be damaged from uneven heat input
Solution Approach 1:
The first and second condensing components perform preliminary focusing actions on the laser beam before it reaches the workpiece. By pre-condensing the beam in both vertical and horizontal directions, the system ensures uniform energy distribution and proper focal concentration, preventing both processing inaccuracies and optical component damage from uneven heat input.
Solution Approach 2:
The patent changes the beam parameters (beam diameter and intensity distribution) through the condensing components. The first condensing component changes the vertical beam parameter, and the second changes the horizontal parameter, transforming the laser beam into a properly focused state with uniform energy distribution that protects optical components and ensures processing accuracy.
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 enables proper focusing of the laser beam, ensuring it is irradiated to the workpiece with a circular cross-sectional shape, enhancing processing accuracy and preventing optical component damage from uneven heat input.
Implementation Method 1
The first light guide part includes a first condense part that condenses the laser so that the beam diameter in a first direction of the laser becomes smaller
Implementation Method 2
The second light guide part includes a second condense part that condenses the laser so that a beam diameter in a second direction perpendicular to the first direction of the laser becomes smaller
Implementation Method 3
The polygon mirror has a reflective surface arranged in a polygonal shape and reflects the laser guided by the first light guide part on the reflective surface while rotating
Data Source
AI summary
A laser scanning device includes a first light guide part, a polygon mirror, and a second light guide part. The first light guide part reflects and guides a laser generated by a laser generator. The polygon mirror has reflective surfaces arranged in a polygonal shape and reflects the laser guided by the first light guide part on the reflective surface while rotating. The second light guide part reflects the laser reflected by the reflective surface of the polygon mirror and guides the laser so that the laser is irradiated to a workpiece. The first light guide part includes a first cylindrical lens for condensing the laser so that the beam diameter in the first direction of the laser becomes smaller. The second light guide part includes a second cylindrical lens (43) for condensing the laser so that the beam diameter in the second direction perpendicular to the first direction of the laser becomes smaller.