Laser Machine Calibration Segment for Geometric Error Detection
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Solution Overview
Problem
Existing laser machines lack a method to detect and correct static geometric errors without requiring additional recording devices like cameras or photosensors, leading to manual and time-consuming evaluations.
Innovation Solution
A calibration segment with 4-quadrant photodiodes or image sensors is used to detect geometric errors by tracing a defined path on a calibration plate, allowing for automated detection and correction of deviations in the laser beam's focal point and position.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If manual evaluation and adjustment methods are used for laser machines, then no additional recording devices are required, but the process becomes time-consuming and labor-intensive
Solution Approach 1:
The patent introduces a calibration plate with a grid structure as an intermediary object between the laser machine and the evaluation process. This calibration plate serves as a mediator that enables automated detection of geometric errors through its structured pattern, resolving the contradiction by providing a simple yet effective interface for measurement without requiring complex additional devices
Solution Approach 2:
The patent replaces manual mechanical evaluation and adjustment operations with an automated optical detection system using cameras and image processing algorithms. The mechanical process of manual measurement is substituted by optical fields and computational analysis, significantly reducing calibration time while maintaining simplicity through software-based evaluation
2Extent of automation
If calibration plates with grid structures and detector devices are used, then automated detection of geometric errors is enabled, but the device complexity increases
Solution Approach 1:
The patent uses a calibration plate with a grid structure that creates a simplified optical copy or representation of the machine's working space. This grid pattern serves as a surrogate that encodes geometric information in a form that can be easily captured by cameras and processed by algorithms, enabling automation without requiring complex sensor arrays or detection mechanisms
Solution Approach 2:
The patent transforms the complex problem of geometric error detection into a simpler parameter measurement task by using the grid structure's known geometric parameters (spacing, orientation, position). The system changes the measurement parameters from direct mechanical measurement to optical parameter extraction, enabling automated detection while keeping the device relatively simple
3Measurement precision
If photosensitive media are used for calibration, then laser beam position can be recorded, but consumable materials are required
Solution Approach 1:
The calibration plate with grid structure serves itself as the measurement target without requiring external consumable materials. The grid pattern inherently provides the reference framework needed for measurement, eliminating the need for photosensitive media or other consumables that would need replacement after each calibration cycle
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 quick and precise identification and correction of geometric errors, improving processing accuracy by automating the detection and adjustment of laser machines.
Implementation Method 1
a 4-quadrant photodiode or image sensor is used on the detector element
Implementation Method 2
a laser source is operated, and the generated laser beam is sent to a laser head or focusing unit
Data Source
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AI summary
The invention relates to a laser machine, a calibration segment (40), a method for determining the location or position of the centre point of a detector (45(a-d)) on the detector element (43(a-d)) and a method for determining, in particular static, geometrical errors of a laser machine (1) for cutting, engraving, marking and/or inscribing a workpiece (7), in which at least one radiation source (4, 22) in the form of a laser (5, 6, 23, 27) is used in a housing (3, 19) of the laser machine (1), wherein, when the laser (5, 6, 23, 27) is activated, a laser beam (10) is directed via deflection elements (11) to a focusing unit (12, 26, 29) or laser head (12, 26, 29), wherein a processing table (9, 21, 30) is arranged for positioning a workpiece (7). At least one calibration segment (40) having at least three light-sensitive detector elements (43(a-d)) is placed on the processing table (9, 21, 30) and a calibration process is started in which a light source (16) coupled into the laser beam path or additional light source (16) mounted on the focusing unit (12, 26, 29) or laser head (12, 26, 29), in particular a laser pointer (16), is activated and the focusing unit (12, 26, 29) or the laser head (12, 26, 29) automatically approaches a defined position or a manually set position of a detector element (43(a-d)), whereupon the impingement of a light beam (17), in particular of a laser pointer point (17), on a light-sensitive detector (45(a-d)), in particular a centre point of the detector (45(a-d)) on the detector element (43(a-d)), is detected and evaluated, whereupon the next light-sensitive detector element (43(a-d)), in particular the detector of the detector element (43(a-d)) is approached automatically or manually until all existing light-sensitive detector elements (43(a-d)) have been passed.