Laser Projection Module Non-Zero Beam Detection Safety
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Solution Overview
Problem
The intensity of zero-order laser beams emitted by existing laser projection systems can be too high, potentially harming users' eyes due to incomplete diffractation by diffractive optical elements, as these systems lack effective mechanisms to detect and adjust for non-zero order beam intensities.
Innovation Solution
A laser projection module comprising a laser emitter, reflection element, diffractive optical element, and optical detector that detects the intensity of non-zero order beams and adjusts the emission power of the laser emitter when the intensity is below a predetermined threshold, ensuring safe operation by reducing the emission power when zero-order beam energy is excessive.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the laser emitter emits high-intensity laser, then the laser projection brightness is improved, but the zero-order beam intensity becomes too large which may harm the user's eyes
Solution Approach 1:
The patent applies preliminary action by using the optical detector to detect the intensity of non-zero order beams before the laser projection is completed. The system predicts the zero-order beam intensity based on this detection and adjusts the laser emitter power in advance to prevent excessive zero-order beam intensity that could harm users' eyes.
Solution Approach 2:
The patent implements feedback by using the optical detector to continuously monitor the intensity of non-zero order beams and feeding this information back to the control unit. The control unit then adjusts the laser emitter power based on this feedback to maintain safe operating levels while ensuring adequate projection brightness.
2Productivity
If the diffractive optical element is used to diffract laser, then the laser pattern is formed, but the zero-order beam cannot be completely diffracted resulting in excessive intensity
Solution Approach 1:
The patent introduces an intermediary solution by using the optical detector to indirectly measure the characteristics of the zero-order beam through detection of non-zero order beams. Since directly measuring the zero-order beam is difficult, the system uses the detectable non-zero order beams as an intermediary to infer and control the zero-order beam intensity.
Solution Approach 2:
The patent replaces direct mechanical or physical intervention with an optical detection and control system. Instead of modifying the diffractive optical element itself to prevent zero-order beam issues, the system uses optical detection and electronic control to manage the laser emitter power, substituting direct mechanical modification with a control-based approach.
3Device complexity
If no detection mechanism is added, then the device complexity is low, but the system cannot detect or adjust non-zero order beam intensity
Solution Approach 1:
The patent applies self-service by enabling the laser projection system to automatically monitor and adjust its own operation. The optical detector and control unit form a self-regulating mechanism that automatically detects non-zero order beam intensity and adjusts the laser emitter power without requiring external intervention, thereby improving safety while maintaining operational simplicity.
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
The solution effectively mitigates the risk of eye damage by dynamically adjusting the laser emission power based on detected non-zero order beam intensities, enhancing user safety and the overall performance of the laser projection module.
Implementation Method 1
The optical detector is arranged between the laser emitter and the reflection element, and configured to detect an intensity of a non-zero beam of the laser
Implementation Method 2
The diffractive optical element is arranged in a light exiting direction of the reflection element and configured to diffract the laser reflected by the reflection element
Implementation Method 3
The reflection element is arranged in a laser emission direction of the laser emitter and configured to reflect the laser emitted from the laser emitter
Data Source
AI summary
A laser projection module, a depth camera and an electronic device are provided. The laser projection module includes a laser emitter configured to emit laser; a reflection element arranged in a laser emission direction of the laser emitter and configured to reflect the laser emitted from the laser emitter; a diffractive optical element arranged in a light exiting direction of the reflection element and configured to diffract the laser reflected by the reflection element; and an optical detector arranged between the laser emitter and the reflection element, and configured to receive the laser and detect an intensity of a non-zero order beam of the laser.