Scanning Cantilever Position Detection Using Optical Intermediaries
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Solution Overview
Problem
There is a need for improved methods and systems in augmented reality display technologies to accurately determine the position of a scanning cantilever, such as a scanning fiber, in real-time or near real-time for precise image projection.
Innovation Solution
The system employs a cantilever position detection method using a projector with a chassis, an actuator, and a cantilever light source. A plurality of optical source/photodetector pairs are disposed in a lateral plane orthogonal to the longitudinal axis of the cantilever, allowing for the detection of the cantilever's position based on the light emitted and received.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional position detection methods are used for the scanning cantilever, then the system structure is simpler, but the measurement precision and real-time detection capability are insufficient
Solution Approach 1:
The patent introduces an optical intermediary system consisting of light sources and photodetectors to detect cantilever position. The light sources emit light that interacts with the cantilever, and photodetectors detect the light changes, serving as intermediaries between the cantilever and the detection system, thereby achieving high-precision position detection without direct mechanical contact
Solution Approach 2:
The patent replaces traditional mechanical position detection methods with an optical detection system. Instead of using mechanical sensors or contact-based measurement devices, the system uses light emission and detection to measure cantilever position, eliminating mechanical complexity while improving measurement precision
2Manufacturing precision
If real-time cantilever position detection is implemented, then the image projection precision is improved, but the response time and detection speed must be increased
Solution Approach 1:
The patent implements periodic scanning of the cantilever position using sequentially activated light sources and photodetectors. The system detects position at multiple discrete points in time during the cantilever's motion cycle, reconstructing the continuous position information from these periodic measurements, thereby achieving both real-time detection and high precision
Solution Approach 2:
The patent positions multiple light sources and photodetectors in advance at predetermined locations to cover the entire range of cantilever motion. This preliminary arrangement allows the system to detect position changes immediately as they occur without requiring complex real-time calculation or adjustment, thus improving detection speed
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
This approach enables real-time detection of the scanning cantilever's position, providing accurate feedback for control systems and enhancing the performance of augmented reality display systems by ensuring precise light projection.
Implementation Method 1
generating a first light beam using a first optical source disposed in the position measurement region, directing the first light beam toward the aperture in the position measurement region, and detecting at least a portion of the first light beam using a first photodetector
Data Source
AI summary
A method of measuring a position of a scanning cantilever includes providing a housing including an actuation region, a position measurement region including an aperture, and an oscillation region. The method also includes providing a drive signal to an actuator disposed in the actuation region, oscillating the scanning cantilever in response to the drive signal, generating a first light beam using a first optical source, directing the first light beam toward the aperture, detecting at least a portion of the first light beam using a first photodetector, generating a second light beam using a second optical source, directing the second light beam toward the aperture, detecting at least a portion of the second light beam using a second photodetector, and determining the position of the scanning cantilever based on the detected portion of the first light beam and the detected portion of the second light beam.