Laser Projection Eye Protection via Dynamic Intensity Control
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Solution Overview
Problem
Laser projection systems lack effective human eye protection mechanisms to prevent damage from high-energy laser beams, particularly when objects enter the projection region.
Innovation Solution
A projection apparatus and method that includes a detector, laser source control unit, and laser source unit, where the detector sends a detection signal to the laser source control unit, which adjusts the light emission luminance of the laser source based on the presence of an object in the projection region, reducing the risk of eye damage by lowering the beam intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the laser beam intensity is maintained at high levels for effective projection, then the projection quality and visibility are improved, but the risk of eye damage increases when objects enter the projection region
Solution Approach 1:
The laser source control unit dynamically adjusts the light emission luminance of the laser source based on real-time detection signals. When an object is detected in the projection region, the system transitions from high intensity projection mode to reduced intensity mode, making the laser beam intensity variable rather than static, thus resolving the contradiction between projection quality and safety
Solution Approach 2:
The system implements a feedback mechanism where the detector continuously monitors the projection region and sends detection signals to the laser source control unit. This closed-loop feedback enables the system to respond automatically to the presence of objects, adjusting the laser intensity appropriately to maintain both projection effectiveness and safety
2Reliability
If a detection system is added to monitor the projection region for safety, then the eye protection capability is improved, but the device complexity increases
Solution Approach 1:
The detector serves multiple functions: it detects objects in the projection region for safety purposes, and its detection signals are used to control the laser source intensity. By making the detection system multi-functional, the patent reduces the need for separate control mechanisms, thereby limiting the increase in device complexity while improving eye protection capability
Data Source
AI summary
A projection apparatus includes a detector, a laser source control unit and a laser source unit, and the laser source control unit is connected to the detector and the laser source unit. The detector is configured to obtain a detection signal for indicating whether there is an object to be protected in a laser projection region, and send the detection signal. The laser source control unit is also configured to: receive the detection signal, and send an adjustment signal carrying an adjusted projection parameter to the laser source unit when it is determined that there is the object to be protected in the laser projection region of the laser source unit based on the detection signal. The projection parameter indicates a light emission luminance of at least one laser in the laser source unit. The laser source unit is configured to emit a beam in response to the adjustment signal.