Optical Scanning Projection System with Detection Frame
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Solution Overview
Problem
The laser scanning projection system faces safety issues due to potential high brightness single light spots from faulty scanning elements and image distortion caused by quick temperature changes during dynamic projection, leading to viewer harm and frame blur.
Innovation Solution
An optical scanning projection system is designed with a scanning light source, a transparent element, a second reflecting element, a scanning element, a photosensitive element, and a control module that emits a main light beam and a detection light beam. The control module selectively actuates or stops the scanning light source based on sensing signals from the photosensitive element, ensuring safety and compensating for image distortions by adjusting synchronization signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the scanning element is faulty and cannot transform the laser light into the projection frame, then a high brightness single light spot is formed which is hazardous to the viewer's eyes, but the system cannot immediately detect and stop the laser light emission
Solution Approach 1:
The patent introduces a detection frame that is reflected by the scanning element before the main projection frame. This detection frame contains a detection line that can be sensed by the photosensitive element to detect scanning element status in advance, allowing the control module to stop laser emission before harmful single light spots can form
Solution Approach 2:
The patent introduces a photosensitive element as an intermediary detector between the scanning element and the control module. This photosensitive element senses the detection line reflected by the scanning element, converting optical signals into electrical signals that trigger the control module to stop laser emission when faults are detected
2Productivity
If the content of the projection frames changes quickly during dynamic projection, then the power of the laser light changes quickly causing temperature changes in the scanning element, but such quick temperature changes influence the amplitude of the scanning element and cause misalignment of scanning frames
Solution Approach 1:
The patent uses the photosensitive element to detect the detection line and provides feedback to the control module about the scanning element's status and temperature conditions. This feedback allows the control module to adjust the synchronization signal timing to compensate for amplitude changes caused by temperature variations, maintaining frame alignment during dynamic projection
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 system prevents viewer harm by stopping the scanning light source when the scanning element fails and compensates for image distortions by adjusting synchronization signals, maintaining image clarity and safety during dynamic projection.
Implementation Method 1
The transparent element receives the main light beam and reflects a part of the main light beam to be a reflected light while allowing a part of the main light beam to transmit to become a transmitting light
Implementation Method 2
The scanning element reflects the transmitting light incident on the scanning element and the reflected light reflected by the second reflecting element in a scanning manner
Implementation Method 3
the photosensitive element receives the reflected light from the scanning element and outputs a sensing signal
Data Source
AI summary
An optical scanning projection system includes a scanning light source component, a second reflecting element, a transparent element, a scanning element, a photosensitive element and a control module. The transparent element receives a main light beam emitted by the scanning light source component and reflects a part of the main light beam to be a reflected light. The reflected light is reflected by the second reflecting element, and the scanning element reflects the reflected light from the second reflecting element in a scanning manner. The photosensitive element receives the reflected light from the scanning element and outputs a sensing signal, and the control module actuates or stops actuating the scanning light source component according to the sensing signal. Therefore, when the scanning element is damaged, the control module may instantly stop actuating the scanning light source component, thereby enhancing the using safety of the optical scanning projection system.