3D Scanner Lens Amplitude Control for Depth of Field
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Solution Overview
Problem
Conventional three-dimensional scanners face challenges in maintaining a stable depth of field, leading to either excessively narrow or wide imaging ranges, which affects the accuracy and efficiency of obtaining three-dimensional data of surface geometry, particularly in applications like intraoral scanning where precise imaging is critical.
Innovation Solution
A three-dimensional scanner with a lens that makes reciprocating linear motion, controlled by a controller to adjust the amplitude of motion based on geometrical data obtained from the imaging process, ensuring an appropriate depth of field is maintained for accurate and efficient data capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the amplitude of reciprocating motion of the lens is increased to enlarge the depth of field, then the imaging range increases, but unnecessary portions are imaged which increases computing load and heat generation
Solution Approach 1:
The patent applies dynamics by making the lens reciprocating motion amplitude adjustable rather than fixed. The lens controller dynamically changes the amplitude based on the actual imaging requirements and object characteristics, allowing the system to optimize between imaging range and processing load in real-time.
Solution Approach 2:
The patent changes the parameter of lens reciprocating motion amplitude to control the depth of field. By adjusting this parameter, the system can precisely control the imaging range to match the actual object size, avoiding unnecessary imaging and reducing computing load for processing.
2Measurement precision
If the amplitude of reciprocating motion of the lens is decreased to reduce the depth of field, then the imaging range narrows, but the accuracy of obtained three-dimensional data improves
Solution Approach 1:
The system dynamically adjusts the lens reciprocating motion amplitude based on the object characteristics and imaging requirements. This allows the system to optimize the balance between data accuracy and imaging efficiency, switching between narrow and wide imaging ranges as needed.
Solution Approach 2:
By changing the reciprocating motion amplitude parameter, the system can precisely control the depth of field to match the object size, ensuring high measurement precision while maintaining appropriate imaging efficiency for different scanning scenarios.
3Temperature
If the frame rate of the imaging unit is lowered to suppress heat generation, then the computing load decreases, but the accuracy of obtained three-dimensional data is reduced
Solution Approach 1:
The system performs preliminary action by pre-adjusting the lens reciprocating motion amplitude to optimize the imaging range before data acquisition. This ensures that only necessary portions are imaged at high frame rates, reducing unnecessary heat generation while maintaining data accuracy.
Solution Approach 2:
The system changes the reciprocating motion amplitude parameter to match the object characteristics, which reduces the imaging range to only necessary portions. This allows high frame rate imaging with reduced heat generation, as the imaging unit processes fewer pixels while maintaining data accuracy.
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 solution allows for precise adjustment of the depth of field, enhancing the accuracy and speed of data acquisition by optimizing the imaging range, reducing unnecessary data processing and heat generation, and maintaining high frame rates for improved data quality.
Implementation Method 1
a lens driver configured to drive the lens to make reciprocating motion in a linear direction
Implementation Method 2
detecting light reflected at the object
Data Source
AI summary
A three-dimensional scanner includes a lens, imaging circuitry that obtains an image of an object located at a focal position of the lens, a lens driver that drives the lens to make reciprocating motion in a linear direction, obtaining circuitry that obtains geometrical data representing a surface geometry based on an image taken by the imaging circuitry, and lens controller circuitry that controls the lens driver to change an amplitude of reciprocating motion of the lens based on the geometrical data obtained by the obtaining circuitry.