Board Inspection Height Measurement Using Dual-Angle Light Beams
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional measurement devices that use linear measurement light beams to image a measurement target require excessive time due to the need to move an imager in the optical axis direction to remove noise light images caused by multiple reflections, leading to inefficiencies in measurement time.
Innovation Solution
The use of multiple projectors projecting measurement light beams from different inclination angles allows for the removal of reflected light noise without moving the imager in the optical axis direction, enabling accurate measurement by distinguishing and correcting positional deviations caused by different angles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the imager is moved in the optical axis direction to remove noise light images caused by multiple reflections, then measurement accuracy is improved, but measurement time increases
Solution Approach 1:
The patent introduces a new dimension (optical inclination angle) to differentiate between valid measurement light and reflected noise. By projecting light beams at different inclination angles, the system can identify and eliminate reflected light based on angular differences, avoiding the need for optical axis movement and thereby reducing measurement time while maintaining accuracy.
Solution Approach 2:
The patent changes the parameter of light projection angle to solve the problem. Instead of moving the imager along the optical axis, the system varies the inclination angle of projected light beams and uses this parameter difference to distinguish and remove reflected light noise, achieving both accuracy and speed.
2Measurement precision
If multiple projectors are used to project light beams from different inclination angles, then reflected light noise removal is improved, but device complexity increases
Solution Approach 1:
The patent segments the measurement function by using multiple projectors, each responsible for projecting light at a specific inclination angle. This segmentation allows the system to handle different angular components separately, making it easier to identify and remove reflected light while distributing the complexity across multiple simple projector units rather than one complex imaging system.
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 approach enables accurate measurement of the target while reducing the time required, preventing increases in imaging time and ensuring precise height information acquisition by eliminating reflected light noise.
Implementation Method 1
a first projector on a first side with respect to the imager to project a linear first measurement light beam onto the measurement target from a direction inclined at a first angle with respect to a horizontal direction
Implementation Method 2
the focused measurement light beam is identified, and a noise light image caused by multiple reflections is removed
Data Source
AI summary
A measurement device includes an imager, a first projector to project a linear first measurement light beam onto a measurement target from a direction inclined at a first angle, and a second projector to project a linear second measurement light beam onto the measurement target from a direction inclined at a second angle. The measurement device further includes a controller configured or programmed to remove reflected light noise based on the first measurement light beam and the second measurement light beam projected onto the measurement target and imaged by the imager and acquire height information of the measurement target.