Polygon Mirror Laser Grooving With Non-Condensing Corner Beam Control
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Solution Overview
Problem
Existing groove processing devices using laser beams struggle to achieve uniform groove depth and prevent contamination of optical components due to the division of laser beams at corner portions of the polygon mirror, leading to shallow end portions and potential misprocessing of non-target areas.
Innovation Solution
A groove processing device and method that incorporate a non-condensing optical system, which includes a non-focusing or diverging portion to handle laser beams reflected from corner portions of the polygon mirror, preventing them from being focused on the object and thus avoiding shallow grooves and optical component contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a shielding plate is provided to block laser beams from corner portions, then uniform groove depth is achieved, but the shielding plate is processed causing contamination of optical components
Solution Approach 1:
The patent extracts and removes the harmful laser beams from corner portions of the polygon mirror before they can cause contamination. The optical system is designed to transmit only laser beams from non-corner portions to the condensing lens, effectively taking out the problematic corner portion beams from the optical path and preventing them from reaching and contaminating optical components while maintaining uniform groove depth.
Solution Approach 2:
The patent applies local quality by treating different portions of the laser beam differently. The optical system distinguishes between laser beams from corner portions (which are blocked) and laser beams from non-corner portions (which are transmitted and focused). This selective treatment based on the local origin of each beam enables uniform groove processing while preventing contamination.
2Device complexity
If laser beams from corner portions are transmitted, then the optical system is simple, but the end portions of grooves are shallow and uniform processing is difficult
Solution Approach 1:
The patent implements local quality by creating different optical paths for different portions of the incoming laser beam. The optical system includes a condensing lens with specific aperture positioning that selectively transmits laser beams from non-corner portions while blocking those from corner portions. This localized differentiation in beam treatment achieves uniform groove depth without requiring complex additional components.
3Use of energy by moving object
If laser beams from corner portions are focused, then energy density is high, but the beams are irradiated in wrong direction causing misprocessing
Solution Approach 1:
The patent extracts and removes laser beams from corner portions of the polygon mirror from the optical path before they can be focused and cause misprocessing. The optical system is configured to transmit only laser beams from non-corner portions to the condensing lens, effectively taking out the harmful corner portion beams that would otherwise be focused in wrong directions and irradiate incorrect positions or contaminate optical components.
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 approach ensures uniform groove processing and depth without contaminating optical components, preventing misprocessing of non-target areas and enhancing the quality of groove formation.
Implementation Method 1
a condensing portion which transmits the laser beam reflected from one surface of the polygon mirror so as to be focused on the surface of the object
Implementation Method 2
a non-condensing portion which is provided outside the condensing portion and transmits the laser beam reflected from a corner portion, in which two adjacent surfaces of the polygon mirror meet, so as not to be focused on the surface of the object
Implementation Method 3
a polygon mirror that reflects the laser beam output from the light source device
Data Source
AI summary
A groove processing device (100) that forms a groove in a surface of an object using a laser beam includes: a light source device (11) that outputs the laser beam; a polygon mirror (10) that reflects the laser beam output from the light source device (11); and an optical system that is provided on an optical path of the laser beam reflected from the polygon mirror (10) and includes a condensing portion (13A) which transmits the laser beam reflected from one surface of the polygon mirror (10) so as to be focused on the surface of the object and a non-condensing portion (13B) which is provided outside the condensing portion (13A) and transmits the laser beam reflected from a corner portion, in which two adjacent surfaces of the polygon mirror (10) meet, so as not to be focused on the surface of the object.