Laser Calibration via Light Reference Marks in Parallel Additive Manufacturing

The patent applies preliminary action by performing calibration of multiple laser devices before parallel production using light reference marks. The system pre-establishes accurate positional relationships between laser devices and the build field, creating a calibrated state that compensates for thermal deformations during subsequent production. This preliminary calibration enables both high productivity through parallel processing and maintains manufacturing precision by addressing positioning accuracy before thermal effects accumulate.

The patent introduces light reference marks as an intermediary element that mediates between the laser devices and the build field. These light reference marks serve as a common reference framework that all laser devices can use to establish accurate positional relationships. This intermediary approach enables system-wide calibration without requiring complex individual adjustments of each galvanometer scanner, maintaining both simplicity and high manufacturing precision across the entire parallel production system.

The patent replaces mechanical calibration and synchronization systems with an optical-based calibration system using light reference marks. Instead of relying on mechanical adjustments and synchronization of multiple laser devices, the system uses optical projection of light reference marks that all laser devices can detect and use for positioning. This substitution enables parallel operation at high speeds while maintaining precise synchronization and positional accuracy through optical rather than mechanical means.