Optical Pickup Unit Orientation Feedback for Precise Component Placement
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Solution Overview
Problem
Existing pick-and-place apparatuses face issues with inconsistent force application during electronic component placement, leading to variations in adhesive flow-out and component orientation, and difficulty in determining the orientation and position of the pickup unit due to its moving nature.
Innovation Solution
A system utilizing a diffraction grating on the pickup unit to emit and detect multiple light beams, allowing for precise determination of orientation and force application through sensors and a processor, which adjusts the pickup unit's orientation and force based on detected beam positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a pickup unit is used for placing electronic components, then the components can be arranged onto a carrier, but the force application varies causing adhesive flow-out variations and orientation variations
Solution Approach 1:
The patent applies feedback by using a diffraction grating and light sensor system to detect the pickup unit's orientation and position in real-time during operation. The detected information is fed back to the control system, which then adjusts the pickup unit's orientation and force application to maintain consistent placement quality, thereby resolving the contradiction between placement precision and force consistency.
Solution Approach 2:
The patent replaces traditional mechanical orientation detection methods with an optical measurement system using diffraction gratings and light sensors. This substitution allows for non-contact measurement of the pickup unit's state, enabling more precise and reliable control of force application during component placement.
2Adaptability or versatility
If the pickup unit moves during operation, then components can be placed at different positions, but determining orientation and position becomes complicated
Solution Approach 1:
The patent replaces complex mechanical sensing systems with an optical measurement system based on diffraction gratings. This optical system provides a simpler and more reliable way to detect orientation and position changes during pickup unit movement, enabling the system to maintain position flexibility while reducing detection complexity.
Solution Approach 2:
The patent uses optical detection methods that measure light beam positions and diffraction patterns to determine pickup unit orientation. By converting mechanical orientation information into optical measurements, the system can easily track position and orientation changes without complex mechanical sensors.
3Ease of manufacture
If adhesive is arranged in predefined quantities, then components can be fixed, but variations in placement force cause adhesive flow-out variations
Solution Approach 1:
The patent uses feedback from the diffraction grating and light sensor system to monitor pickup unit position and orientation in real-time. This information is used to dynamically adjust placement force, ensuring consistent adhesive flow-out and maintaining precise adhesive quantity despite variations in predefined adhesive application.
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
Ensures consistent force application and accurate placement of electronic components, reducing adhesive flow-out and orientation variations, and enabling precise control of the pickup unit's position and orientation.
Implementation Method 1
a collimated light source configured for emitting collimated light onto the diffraction grating thereby creating, by means of diffraction by the diffraction grating, an m-th order light beam and an n-th order light beam
Data Source
AI summary
According to an aspect of the present disclosure, a pickup unit is provided for a pick-and-place apparatus. The pickup unit includes a deformable shaft that is elongated in a longitudinal axis and that has an outer surface with a flat portion. At least one diffraction grating is formed in or arranged in the flat portion of the outer surface.