Optical Detecting Device Asymmetric Axis Signal Noise
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Solution Overview
Problem
Existing optical detecting devices suffer from low signal-to-noise ratio (SNR) and high power consumption due to the sampling optical axis being parallel to the detecting surface normal vector, resulting in incomplete reception of reflected signals from external objects.
Innovation Solution
The optical detecting device is designed with a light emitting module that slants its optical axis relative to the detecting surface normal vector by using an optical modulating component, such as a symmetric or asymmetric lens, to project the sampling signal centrally onto the touch plane, thereby increasing the signal-to-noise ratio and reducing power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the sampling optical axis is parallel to the detecting surface normal vector, then the device structure is simple, but the signal-to-noise ratio is low and reception efficiency is poor
Solution Approach 1:
The patent applies asymmetry by deviating the sampling optical axis from the detecting surface normal vector. The light emitting module is positioned at an asymmetric angle relative to the optical detecting component, creating a non-parallel configuration where the sampling optical axis intersects the detecting surface at a specific angle. This asymmetric arrangement enables the sampling signal to be properly directed onto the detecting surface, significantly improving signal-to-noise ratio and reception efficiency while maintaining reasonable structural complexity.
2Device complexity
If the sampling optical axis is parallel to the detecting surface normal vector, then the device structure is simple, but the power consumption is high
Solution Approach 1:
The asymmetric positioning of the light emitting module relative to the optical detecting component allows the sampling signal to be efficiently directed onto the detecting surface. This configuration reduces the amount of light energy required to achieve adequate signal reception, thereby lowering power consumption while maintaining a relatively simple device structure.
3Measurement precision
If the light emitting module slants the optical axis to cross over the detecting surface normal vector, then the signal-to-noise ratio is increased, but the device complexity increases
Solution Approach 1:
The patent implements a straightforward asymmetric configuration where the light emitting module is positioned at a specific angle relative to the optical detecting component. This simple angular deviation allows the sampling optical axis to cross over the detecting surface normal vector, improving signal-to-noise ratio without requiring complex mechanical structures or multiple adjustment mechanisms.
Solution Approach 2:
The patent introduces angular dimensionality by positioning the light emitting module at a specific angle relative to the detecting surface normal vector. This angular offset creates a three-dimensional spatial relationship where the sampling optical axis intersects the detecting surface at an optimized angle, improving signal reception without adding mechanical complexity.
4Use of energy by moving object
If the light emitting module slants the optical axis to cross over the detecting surface normal vector, then the power consumption is reduced, but the device complexity increases
Solution Approach 1:
The asymmetric angular positioning of the light emitting module optimizes light energy utilization by directing the sampling signal efficiently onto the detecting surface. This configuration reduces the total light power required for effective detection, achieving lower power consumption with a relatively simple structural modification.
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 design enhances the signal-to-noise ratio and conserves energy by ensuring that the sampling signal is focused on the center of the touch plane, reducing power consumption and maintaining signal quality even in low-luminance conditions.
Implementation Method 1
The optical modulating component is a symmetric optical lens, the light emitting unit is partially under a region of the symmetric optical lens to narrow a luminous angle of the light emitting unit
Implementation Method 2
the optical detecting component is adapted to receive the sampling signal reflected from the external object
Data Source
AI summary
An optical detecting device capable of increasing signal-to-noise ratio (SNR) and economizing power consumption is installed on a wearable device. The optical detecting device includes a base, an optical detecting component and a light emitting module. The optical detecting component is disposed on the base and has a detecting surface normal vector. The light emitting module is disposed on the base and outputs a sampling signal to project onto an external object, and the optical detecting component can receive the sampling signal reflected from the external object. The light emitting module is slanted toward the optical detecting component, and an optical axis of spatial distribution of the sampling signal and the detecting surface normal vector are crossed to form a deviated angle.