Rotating Optical Displacement Meter with Protective Housing
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Solution Overview
Problem
Existing optical displacement meters face challenges in achieving high accuracy profiles without a conveyor or linear motion mechanism, and they lack a housing to protect the light projecting and receiving system, leading to issues with dustproofing, disturbance light countermeasures, visual troubles, and safety concerns.
Innovation Solution
An optical displacement meter with a rotatable light projecting and receiving module maintaining a Scheimpflug optical system, housed within a protective enclosure. This configuration allows for accurate profile acquisition without external equipment and addresses dustproofing, safety, and visual concerns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light projecting and receiving system is made rotatable to acquire profiles at multiple positions, then equipment such as conveyor and linear motion mechanism can be eliminated, but the system becomes exposed leading to dustproof and safety issues
Solution Approach 1:
The light projecting and receiving system is nested inside a housing structure that rotates together with the system. The housing contains the optical components during rotation, protecting them from dust and disturbance light while maintaining the rotatable functionality for acquiring profiles at multiple positions without external conveyors
Solution Approach 2:
The housing acts as a protective shell that encloses the light projecting and receiving system. This shell structure provides dustproof protection and safety enclosure while allowing the entire assembly to rotate for scanning the workpiece surface at different angles
2Device complexity
If the Scheimpflug optical system is not maintained in the rotatable configuration, then the system structure is simplified, but measurement accuracy deteriorates
Solution Approach 1:
The support member is designed to maintain the Scheimpflug relationship dynamically during rotation. The light receiving surface is positioned to be inclined with respect to the optical axis in a way that preserves the Scheimpflug condition at all rotation angles, ensuring measurement accuracy is maintained throughout the scanning range
3Device complexity
If the light receiving surface is positioned parallel to the optical axis, then the optical system is simplified, but the depth of field becomes shallow reducing measurement accuracy
Solution Approach 1:
The light receiving surface is positioned at a specific inclination angle relative to the optical axis to create the Scheimpflug condition. This local geometric configuration optimizes the depth of field for the specific measurement task, ensuring that the focal plane coincides with the workpiece surface across the measurement range
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 enables the acquisition of high-accuracy profiles at multiple positions without the need for a conveyor or linear motion mechanism, while ensuring dustproofing, enhancing safety, and improving the operational environment.
Implementation Method 1
a light collecting unit that has a light receiving lens which collects reflected light reflected by a workpiece
Data Source
AI summary
Provided is an optical displacement meter capable of solving problems such as dustproof and safety at the time of an operation and acquiring profiles of a plurality of positions of a workpiece with high accuracy without providing a conveyor or a linear motion mechanism. An optical displacement meter includes a light projecting and receiving module that integrally holds a light projecting unit, a light collecting unit, and a capturing unit to have a Scheimpflug relationship, a motor that integrally rotates the light projecting and receiving module, a housing that stores the light projecting and receiving module, and a control unit that controls the motor, and rotates the light projecting and receiving module in a state where the Scheimpflug relationship is maintained inside the housing to scan the slit light in a direction orthogonal to an X direction.