Shape Measuring Device Focus Positioning via Visual Feedback
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Solution Overview
Problem
Existing shape measuring devices face challenges in accurately and easily positioning a measuring object at the focus of a light receiving unit, which affects the precision and efficiency of shape measurement.
Innovation Solution
A shape measuring device with a stage, a light projecting unit, a light receiving unit, a data generating unit, and a control section that allows users to specify arbitrary positions on an image of the measuring object, adjust the relative distance, and control the light projection to ensure the specified position is at the focus of the light receiving unit, enabling accurate and easy positioning.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the measuring object is positioned at the focus of the light receiving unit to achieve high accuracy in shape measurement, then measurement precision is improved, but the ease of operation deteriorates because it is not easy to accurately position the measuring object at the focus
Solution Approach 1:
The system displays an image of the measuring object captured by the light receiving unit on a display section, allowing users to visually identify the object's position. The control section then automatically adjusts the stage position based on this visual feedback to position the measuring object at the focus of the light receiving unit, resolving the contradiction between precision and ease of operation.
Solution Approach 2:
The system enables users to specify an arbitrary position on the displayed image, and the control section automatically performs the focusing operation by adjusting the stage position. This self-service mechanism allows users to easily obtain high-precision measurements without manually performing complex positioning operations.
2Measurement precision
If the relative distance between the light receiving unit and the stage is adjusted to position the measuring object at the focus, then positioning accuracy is improved, but the device complexity increases due to the need for additional control mechanisms
Solution Approach 1:
The stage is equipped with both positioning functions for general measurement operations and focusing functions for positioning at the light receiving unit's focal plane. This multi-functionality allows a single mechanism to handle both routine positioning and precision focusing, reducing overall device complexity while maintaining high positioning accuracy.
Solution Approach 2:
The control section receives position information from the stage positioning mechanism and automatically adjusts the relative distance between the light receiving unit and stage to achieve focus. This automated feedback control eliminates the need for complex manual focusing mechanisms while maintaining positioning 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
Enables accurate and efficient positioning of the measuring object at the focus of the light receiving unit, improving the precision and ease of shape measurement, even when the specified position is outside the initial measurable range.
Implementation Method 1
a light receiving unit arranged above the stage and configured to receive the light reflected by the measuring object mounted on the stage and output a light receiving signal indicating a light receiving amount
Implementation Method 2
a light projecting unit configured to irradiate the measuring object mounted on the stage with light obliquely from above
Implementation Method 3
a data generating unit configured to generate stereoscopic shape data indicating a stereoscopic shape of the measuring object by a triangular distance measuring method based on the light receiving signal output by the light receiving unit
Data Source
AI summary
The invention provides a shape measuring device, a shape measuring method, and a shape measuring program capable of accurately and easily positioning a measuring object at a focus of a light receiving unit when measuring the shape of the measuring object. An image of a measuring object captured by a light receiving unit is displayed on a display section, and an arbitrary position on the image of the measuring object is specified by a user. A relative distance between the light receiving unit and a stage is changed so that the specified position coincides with a focus of the light receiving unit. The light emitted from a light projecting unit is reflected by the measuring object and received by the light receiving unit. Stereoscopic shape data of the measuring object is generated by a triangular distance measuring method based on a light receiving signal output by the light receiving unit.