3D Scanner Variable Focus Lens Controller for Translucent Objects
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Solution Overview
Problem
Existing three-dimensional scanners face challenges in accurately determining the focal position for objects with translucency and surface glossiness, leading to deteriorated measurement accuracy of three-dimensional shape information.
Innovation Solution
A three-dimensional scanner equipped with a variable focus lens and a controller that adjusts the focal position and light emission amount based on the detected focal position, ensuring optimal image capture regardless of the object's properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a focusing method is used to determine the focal position by imaging objects at multiple focusing positions, then three-dimensional shape information can be acquired, but measurement accuracy deteriorates when objects have translucency or surface glossiness that prevent clear pattern reflection
Solution Approach 1:
The patent changes the light emission amount parameter based on the detected focal position. By adjusting the light emission amount according to the focal position, the system optimizes the light conditions for imaging translucent or glossy objects at different depths, thereby improving measurement accuracy without requiring clear pattern reflection
Solution Approach 2:
The system implements a feedback mechanism where the focal position detection result is used to control the light emission amount. The detection unit detects the focal position, and this information feeds back to the control unit which adjusts the light emission amount accordingly, creating a closed-loop system that adapts to different object properties
2Measurement precision
If the light emission amount is increased to improve image quality for translucent objects, then measurement accuracy improves, but the system becomes more complex requiring dynamic adjustment mechanisms
Solution Approach 1:
The control unit performs multiple functions: it detects the focal position, determines the appropriate light emission amount based on the focal position, and controls the light source. By integrating these functions into a single control unit, the system achieves multi-functionality without increasing overall system complexity
Solution Approach 2:
The system uses its own focal position detection capability to automatically control the light emission amount. The detection unit and control unit work together within the same system, allowing the system to self-regulate the light emission based on real-time focal position information without requiring external control mechanisms
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 solution enhances the measurement accuracy of three-dimensional shape information by effectively managing the light emission and focal position, thereby overcoming the limitations posed by objects with translucency and surface glossiness.
Implementation Method 1
a sensor that detects light from the light source which is reflected by the object
Implementation Method 2
a variable focus lens that is provided between the object and the sensor and changes a focal position for the object
Data Source
AI summary
The present disclosure provides a three-dimensional scanner for acquiring three-dimensional shape information of an object using focusing, including a light source configured to emit light from an emission end face of a housing to the object; a sensor configured to detect light from the light source reflected by the object; a variable focus lens that is provided between the object and the sensor and that changes a focal position based on the object; and a controller configured to change the focal position of the variable focus lens in a process of acquiring the three-dimensional shape information of the object, wherein the controller is configured to change an amount of light from the light source reflected by the object and reaching the sensor based on the focal position of the variable focus lens.