Light Projection Device Aberration Correction
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Solution Overview
Problem
Existing light projection devices with wide-angle optical systems suffer from increased aberration and spreading of the projected light pattern, leading to reduced brightness and accuracy in distance measurement applications.
Innovation Solution
The light projection device incorporates a specific optical configuration with a first lens group of positive power, a diffraction optical element to form the pattern light, and a second lens group of positive power, including a third lens group of positive power and a fourth lens group of negative power, arranged in a specific order to maintain the convergence of the light pattern and correct aberrations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a wide-angle optical system is used to project pattern light over a wide range, then the coverage area is improved, but the aberration increases and the spot area enlarges
Solution Approach 1:
The optical system is divided into multiple lens groups (first lens group with positive power, second lens group with positive power including third lens group and fourth lens group). Each lens group handles specific portions of the light path, allowing the wide-angle requirement to be met while maintaining spot precision through coordinated action of segmented optical components.
Solution Approach 2:
Different lens groups are assigned different optical powers and positions to address local optical quality issues. The third lens group (positive power) and fourth lens group (negative power) are specifically arranged to correct aberrations in different regions of the optical field, ensuring that spots at large angles from the optical axis maintain small areas and high precision.
2Area of stationary object
If a wide-angle optical system is used to project pattern light over a wide range, then the coverage area is improved, but the brightness decreases due to light spreading
Solution Approach 1:
The optical system segments the light transmission path into multiple controlled stages through different lens groups. This segmentation prevents uncontrolled light spreading while maintaining wide-angle projection capability, thereby preserving brightness across the coverage area.
Solution Approach 2:
The optical system utilizes parameter changes in lens power distribution (positive power in first and third lens groups, negative power in fourth lens group) to control light convergence and divergence at different stages, preventing light spreading and maintaining illumination intensity across the wide coverage area.
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 effectively prevents the area of the projected light pattern from spreading, maintaining high brightness and contrast, and thereby enhancing the accuracy of distance measurements even at large angles from the optical axis.
Implementation Method 1
an optical system to project pattern light to an object. The pattern light is obtained from the light emitted from the light source. The optical system includes a first lens group on which the light emitted from the light source incident, the first lens group having a positive power, an optical element to form the pattern light from the light passing through the first lens group and incident on the optical element, and a second lens group on which the pattern light emitted from the optical element incident, the second lens group having a positive power.
Implementation Method 2
a third lens group having a positive power and a fourth lens group having a negative power, and the third lens group and the fourth lens group are arranged in order of the third lens group and the fourth lens group from the optical element
Data Source
AI summary
A light projection device includes a light source to emit light, and an optical system to project pattern light to an object. The pattern light is obtained from the light emitted from the light source. The optical system includes a first lens group on which the light emitted from the light source incident, the first lens group having a positive power, an optical element to form the pattern light from the light passing through the first lens group and incident on the optical element, and a second lens group on which the pattern light emitted from the optical element incident, the second lens group having a positive power. The second lens group includes a third lens group having a positive power, and a fourth lens group having a negative power.