Laser Light Path Monitoring With Parallel Safety Light Field

The patent replaces the optical control system (using low-power laser beam and power reduction) with a mechanical shutter system. The shutter is directly actuated by the sensor device when the light barrier is interrupted, providing immediate physical blocking of the high-power laser beam without requiring power modulation or complex control loops, thus achieving rapid response time while maintaining safety monitoring reliability

The patent positions the shutter in the light path beforehand and pre-positions it in an open state ready for immediate actuation. When the sensor detects object approach by interrupting the light barrier, the shutter is instantly deployed to block the beam, eliminating the time required for power reduction and system reconfiguration that would be needed with conventional optical control methods

The patent separates the safety monitoring function from the laser power control function. The sensor device monitors the light path independently using a separate low-power laser, while the shutter provides physical beam blocking. This segmentation allows the high-power laser to maintain full power and stable operation during normal conditions, with safety ensured by the independent shutter mechanism rather than power modulation

The patent introduces a shutter as an intermediary physical barrier between the laser source and the target. Instead of directly controlling laser power to ensure safety, the shutter acts as a mediator that can instantly block the beam when needed, allowing the laser source to maintain stable operating conditions while safety is guaranteed by the mechanical intervention