Optical Positioning Head Layout for Small Workpiece Mounting Accuracy
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Solution Overview
Problem
Existing positioning systems face challenges in handling small workpieces due to decreased rigidity and difficulty in configuring shafts connecting grippers and heads, leading to deteriorated mounting accuracy and vibration interference with optical units.
Innovation Solution
A positioning device with a vibration-suppressing member between the optical unit and joining head, and separate movement mechanisms for the optical unit and joining head, allowing flexible handling of small workpieces without compromising rigidity or accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the image capture areas of substrate cameras are brought close to each other to handle small workpieces, then the ability to handle small workpieces is improved, but the rigidity of the shaft connecting the driver and component gripper decreases, deteriorating mounting accuracy
Solution Approach 1:
The system is divided into separate functional modules: the optical unit with substrate cameras is separated from the joining head with component gripper. This segmentation allows the optical unit to be positioned for optimal imaging of small workpieces while the joining head maintains its structural integrity and rigidity for accurate component placement.
Solution Approach 2:
A vibration suppressing member is introduced as an intermediary element between the optical unit and the joining head. This mediator isolates the optical unit from vibrations generated by the joining head's movement mechanisms, preventing vibration transmission that would otherwise degrade mounting accuracy while allowing the optical unit to capture images of small workpieces.
2Reliability
If an optically necessary space is provided on the lens side, then the optical performance is improved, but it becomes difficult to configure the shaft connecting the gripper and head depending on workpiece size
Solution Approach 1:
The optical unit is segmented from the joining head, with each having independent movement mechanisms. This allows the optical unit to have its own dedicated space for lenses and optical elements without constraining the shaft configuration of the joining head, resolving the conflict between optical performance requirements and mechanical configuration flexibility.
Solution Approach 2:
The system transitions from a vertically integrated structure to a horizontally separated architecture. The optical unit and joining head are positioned at different horizontal locations with independent movement capabilities, allowing optical space requirements to be satisfied without compromising the shaft configuration flexibility needed for different workpiece sizes.
3Device complexity
If the joining head and optical unit are integrated, then the structure is simplified, but vibration from the joining head interferes with the optical unit, reducing positioning accuracy
Solution Approach 1:
The joining head and optical unit are segmented into separate entities with independent movement mechanisms and mounting structures. This segmentation physically isolates the optical unit from vibrations generated by the joining head's drive systems, eliminating vibration interference while maintaining relatively simple individual structures for each unit.
Solution Approach 2:
A vibration suppressing member serves as an intermediary barrier between the joining head and optical unit. This mediator blocks the transmission of vibrations from the joining head's movement mechanisms to the optical unit, protecting the sensitive optical components and cameras from vibration-induced positioning errors.
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 device effectively handles small workpieces by suppressing vibration transmission and maintaining high mounting accuracy, even with varying workpiece sizes and optical system depths of field, without compromising facility rigidity.
Implementation Method 1
The optical element includes a reflection mirror disposed to correspond to the first camera, and a reflection prism having a reflection surface
Implementation Method 2
a vibration suppressing member for suppressing transmission of vibration from the joining head to the joining head is disposed between the optical unit and the joining head
Data Source
AI summary
Positioning device (100) includes joining head (2), joining stage (4), optical unit (3) that captures an image of at least one of first component (PI) and second component (P2), and processor (6) that calculates a position correction amount of first component (P1) and second component (P2) based on the image captured by optical unit (3).