Optical Device Orthogonal Code Temporal Modulation
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Solution Overview
Problem
Existing optical devices for detecting the degree of inclination of objects, such as eyes, face challenges in safely and efficiently detecting weak reflected light, leading to potential safety risks and reduced utilization efficiency of irradiation light.
Innovation Solution
The optical device employs a plurality of light emitters that emit light temporally modulated by a code having orthogonality, with the first light emitter emitting at a different timing than the second light emitter, preventing simultaneous emission of light to the object and enhancing detection accuracy while maintaining safety and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple light emitters are used to improve detection accuracy, then measurement precision is improved, but radiation intensity increases causing safety risks
Solution Approach 1:
The patent applies periodic action by temporally modulating multiple light emitters using orthogonal codes, causing them to emit light at different timings in a periodic sequence rather than simultaneously. This allows the system to maintain multiple light sources for improved detection accuracy while reducing the peak radiation intensity at any given moment, thereby resolving the contradiction between measurement precision and safety.
2Object-affected harmful factors
If light emission timing is staggered to reduce radiation intensity, then safety is improved, but detection accuracy may deteriorate
Solution Approach 1:
The patent applies parameter changes by using orthogonal codes to modulate the temporal characteristics of light emission. By changing the timing parameters of multiple light emitters according to orthogonal code sequences, the system maintains sufficient signal strength for accurate detection while reducing peak radiation intensity. The orthogonality of the codes ensures that signals from different emitters can be distinguished, preserving detection accuracy despite staggered emission timing.
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 configuration allows for high-accuracy detection of the line of sight and degree of inclination with reduced radiation intensity, thereby improving safety and utilization efficiency, and enabling precise line-of-vision direction detection even in bright environments.
Implementation Method 1
the light emitted from the light emitter is temporally modulated by a code having orthogonality, and the plurality of light emitters include a first light emitter and a second light emitter. In the optical device, the first light emitter emits the light at a timing different from a timing at which the second light emitter emits the light
Implementation Method 2
a detector configured to detect the light reflected by the object and output a signal based on the light reflected by the object
Data Source
AI summary
An optical device, a method of detecting the degree of inclination of a three-dimensional object, and a method of detecting a line of sight. The optical device includes a plurality of light emitters configured to irradiate an object with light, a detector configured to detect the light reflected by the object and output a signal based on the light reflected by the object, and circuitry configured to output data of a degree of inclination of the object obtained based on an output signal output from the detector. In the optical device, the light emitted from the light emitter is temporally modulated by a code having orthogonality, and the plurality of light emitters include a first light emitter and a second light emitter. In the optical device, the first light emitter emits the light at a timing different from a timing at which the second light emitter emits the light.