Optical Navigation Imaging for Accurate Speed Detection
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Solution Overview
Problem
Conventional optical navigation devices struggle to accurately compute the relatively moving speed between the device and a target object due to the illumination light source being positioned close to the optical detector, limiting their applicability.
Innovation Solution
The optical navigation device aligns the light emitting surface of the illumination light source with the focus plane of the optical element assembly, using a collimating lens to project a collimated beam, and employs an operation processor to analyze detection images for precise speed computation, maintaining constant sampling resolution despite changes in relative distance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the illumination light source is placed close to the optical detector in the case, then the device structure is compact, but the relatively moving speed between the device and target object cannot be accurately computed
Solution Approach 1:
The patent positions the illumination light source at the focus plane of the optical element assembly, which is a different spatial dimension compared to the conventional placement near the optical detector. This dimensional change in light source positioning enables accurate speed detection while maintaining compact structure.
Solution Approach 2:
The patent changes the key parameter of light source position from 'near the detector' to 'at the focus plane'. This parameter change fundamentally alters the optical path and imaging characteristics, enabling the system to accurately compute relatively moving speed by establishing a specific geometric relationship between the light source, optical elements, and target object.
2Device complexity
If the distance between the target object and light emitting surface is much greater than the distance to the focus plane, then the conventional configuration is simple, but the sampling resolution varies when relative distance changes
Solution Approach 1:
The patent creates an equipotential optical configuration by placing the light source at the focus plane, which establishes a specific geometric relationship that maintains constant sampling resolution regardless of changes in relative distance between the device and target object.
Solution Approach 2:
The patent changes the light source position parameter to be at the focus plane, which fundamentally alters the imaging geometry. This parameter change ensures that the sampling resolution remains consistent even when the relative distance between the navigation device and target object varies, solving the resolution inconsistency problem.
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 device accurately detects the relatively moving speed and maintains consistent sampling resolution, enabling effective navigation even on uneven terrain, particularly suitable for high-speed applications.
Implementation Method 1
a collimating lens disposed adjacent to a light emitting surface of the illumination light source for generating and projecting a collimated beam onto the target object
Implementation Method 2
the optical detector is disposed adjacent to the optical element assembly, and adapted to acquire a detection image of the target object through the optical element assembly
Implementation Method 3
the illumination light emits illumination light towards a target object, and the optical detector receives the illumination light reflected from the target object
Data Source
AI summary
An optical navigation device is used to detect a relatively moving speed between the optical navigation device and a target object. The optical navigation device includes an optical element assembly, an optical detector and an illumination light source. The optical detector is disposed adjacent to the optical element assembly, and adapted to acquire a detection image of the target object through the optical element assembly. The illumination light source is disposed next to the optical element assembly in a manner that does not affect magnification of an imaging result produced by reflection from the target object through the optical element assembly.