Dual-Table Exposure Handling for High-Throughput Plate Processing
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Solution Overview
Problem
Existing direct exposure systems for processing plate-shaped workpieces, such as circuit boards or wafers, face limitations in throughput due to handling and alignment times, requiring multiple exposure devices and complex setups for simultaneous exposure of both sides, which increases nonproductive time and costs.
Innovation Solution
A processing apparatus with a movable table system and registration unit, utilizing two tables on a common rail arrangement, allows for independent control of table movement and alignment, enabling simultaneous processing of both sides of a workpiece with a single processing unit, reducing nonproductive time and machine footprint.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple exposure devices are used for simultaneous exposure of both sides, then throughput is improved, but device complexity and cost increase
Solution Approach 1:
The workpiece processing is segmented into two independent sequences: one table processes the first side while the other table processes the second side. Each table operates independently through the processing unit, allowing parallel processing of both sides without requiring multiple complete exposure devices.
Solution Approach 2:
The system adds a temporal dimension to the processing by implementing alternating table movement sequences. Table 1 and Table 2 operate in alternating cycles, with each table entering the processing unit at different times. This temporal segmentation allows single-device dual-side processing, effectively doubling throughput without increasing device count.
2Manufacturing precision
If handling and alignment steps are performed sequentially, then precision is improved, but nonproductive time increases
Solution Approach 1:
The system maintains continuous useful action by overlapping handling and processing operations across two tables. While Table 1 is being handled and aligned, Table 2 is simultaneously being processed, and vice versa. This eliminates idle time between sequential operations and keeps the processing unit continuously utilized.
Solution Approach 2:
Alignment and handling operations are performed in advance on one table while the other table undergoes processing. The registration unit acquires targets and the computer unit calculates alignment data beforehand, so that when the workpiece enters the processing unit, alignment is already complete, eliminating waiting time during actual processing.
3Productivity
If two separate processing units are used for dual-side processing, then throughput is improved, but machine footprint increases
Solution Approach 1:
The system merges two separate processing functions into a single processing unit. Both Table 1 and Table 2 share the same processing unit, which processes workpieces from both sides alternately. This consolidation eliminates the need for two separate processing units, significantly reducing machine footprint while maintaining dual-side processing capability.
Solution Approach 2:
The processing unit is designed with universal functionality to handle workpieces from both sides of the workpiece. The same processing unit that processes the first side can also process the second side, making it a multi-functional device that replaces what would traditionally require two specialized units.
Data Source
AI summary
A movable table system comprising two identical tables on a common rail arrangement having a linear rail region underneath a detection unit and a processing unit, and therefore the tables can be alternatingly moved in a straight line along the common rail arrangement, in the same table-movement direction, fully underneath the detection unit and processing unit, and can be independently controlled by a computer unit. The movable table system provides a new option for processing planar workpieces, in which a particularly high throughput rate and improved precision can be achieved using merely one processing unit.