Stereomicroscope Common Objective Telecentric 3D Measurement
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Solution Overview
Problem
Existing three-dimensional measurement methods, particularly optical triangulation methods, require expensive identical objectives due to manufacturing tolerances, making accurate and cost-effective measurements challenging.
Innovation Solution
A device using a stereomicroscope with a common objective and two tube lenses, where object-side telecentric conditions are established by adjusting the tube lenses and objective to ensure a common projection center at infinity, allowing for accurate three-dimensional reconstruction without the need for identical objectives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If two identical objectives are used in parallel for stereomicroscopy, then measurement accuracy is improved, but device cost increases significantly
Solution Approach 1:
The patent merges the function of two identical objectives into a single common objective that serves both imaging channels. This single objective is used for both the left and right eyes of the stereomicroscope, eliminating the need to manufacture and align two perfectly identical objectives, thereby reducing cost while maintaining measurement accuracy through the telecentric design
Solution Approach 2:
The common objective performs multiple functions: it serves as the imaging lens for both the left and right channels of the stereomicroscope simultaneously. This universal component approach reduces the total number of precision optical elements needed, lowering manufacturing cost while the telecentric design ensures measurement precision is maintained across both channels
2Ease of manufacture
If a common objective is used for both channels, then device cost is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent changes the optical parameters by implementing object-side telecentric conditions, where the entrance pupils of the tube lenses coincide with the rear focus of the common objective. This parameter change ensures that all object points have a common projection center at infinity, which maintains measurement precision while allowing the use of a single common objective, thereby reducing manufacturing complexity and cost
3Measurement precision
If object-side telecentric conditions are established, then three-dimensional reconstruction accuracy is improved, but optical system complexity increases
Solution Approach 1:
The patent introduces tube lenses as intermediary elements between the common objective and the image sensors. These tube lenses are specifically positioned and configured to create object-side telecentric conditions, where their entrance pupils coincide with the rear focus of the common objective. This intermediary arrangement ensures accurate three-dimensional reconstruction by establishing a common projection center while managing the optical system in a structured manner
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 cost-effective three-dimensional measurement by eliminating the need for identical objectives and ensuring ideal conditions for three-dimensional reconstruction, with measurement accuracy within the Abbe resolution limit and ten times the wave-optical depth of field.
Implementation Method 1
Optical methods of triangulation may be mentioned in particular. These use two optical images of the object to be measured, which were taken from different positions. The three-dimensional shape of the object to be measured can be obtained by comparing the two images.
Implementation Method 2
the tube lenses and the objective can be adjusted such that the entrance pupils of the two tube lenses, relative to the optical axis of the objective, coincide with the rear focus of the objective
Data Source
AI summary
A device for three-dimensional measurement of an object, with a stereomicroscope of the telescope type, which has a common objective and a first and a second tube lens, a first image sensor, which is assigned to the first tube lens, a second image sensor (8), which is assigned to the second tube lens, and a control unit, which determines the three-dimensional shape of the object from the images obtained with the two image sensors and carries out a predetermined three-dimensional measurement, wherein the stereomicroscope is designed such that the images are obtained with object-side telecentric conditions of the stereomicroscope.