Glass Substrate Loading Cassette Structure for Sag Control
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Solution Overview
Problem
Glass substrates, particularly those with large areas, are prone to sagging and damage due to their fragility and weight, when loaded and moved in conventional cassettes, leading to potential damage during handling and processing.
Innovation Solution
A loading cassette design featuring an upper and lower plate with edge and rear supporting units, including a middle supporting member that controls the sag of the substrate within 3 mm, ensuring stable support and minimizing impact during loading, moving, and storage of glass substrates with or without through holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If glass substrates with large area are loaded in conventional cassettes, then the substrate can be stored and transported, but the substrate sags and damages due to its own weight and fragility
Solution Approach 1:
The supporting structure is segmented into multiple independent supporting units distributed across the cassette. Each supporting unit includes vertical supporting members and horizontal supporting members that work together to provide localized support. This segmentation allows the system to handle large-area substrates by distributing the support load across multiple points rather than relying on a single supporting structure, thereby preventing sagging and damage.
Solution Approach 2:
The invention introduces a three-dimensional supporting structure with vertical supporting members extending from the cassette bottom wall upward, and horizontal supporting members positioned at different heights. This multi-dimensional arrangement creates a spatial support network that prevents substrate sagging in multiple directions, addressing the limitation of conventional two-dimensional flat supporting surfaces.
2Adaptability or versatility
If thin glass substrates are used for semiconductor packaging, then high-end packaging requirements are met, but the substrates become fragile and vulnerable to vibration and impact
Solution Approach 1:
The cassette incorporates buffer members positioned between the substrate and the supporting structure. These buffer members provide cushioning protection before impact or vibration occurs, absorbing shocks and reducing the transmission of mechanical stresses to the fragile thin glass substrate. This beforehand cushioning prevents damage during handling, loading, and transportation.
Solution Approach 2:
The horizontal supporting members are designed with flexible characteristics, allowing them to adapt to the substrate surface while providing support. This flexibility enables the supporting structure to conform to slight variations in substrate geometry without creating stress concentration points that could lead to damage, while still maintaining adequate support for thin substrates.
3Productivity
If multiple substrates are loaded vertically in a cassette, then space utilization is improved, but the substrates may collide or damage each other during movement
Solution Approach 1:
The vertical space within the cassette is segmented into multiple loading spaces, each capable of holding substrates at different vertical levels. The supporting structure is similarly segmented with supporting units positioned at different heights, ensuring that each substrate receives adequate support regardless of its vertical position. This segmentation allows efficient vertical stacking while maintaining substrate integrity.
Solution Approach 2:
Buffer members are strategically positioned between adjacent substrates loaded vertically in the cassette. These buffer members prevent direct contact and potential collision between substrates during movement, vibration, or settling. The cushioning effect protects substrates from impact damage while allowing multiple substrates to be stored in a compact vertical arrangement.
Data Source
AI summary
An embodiment relates to a loading cassette and a target substrate loading method to which same is applied. The loading cassette according to the embodiment comprises: an upper plate; a lower plate facing the upper plate while having a space therebetween; an edge support part for connecting the upper plate to the lower plate and supporting the left and right edges of a target substrate; and a rear surface support part for connecting the upper plate to the lower plate and supporting the center and the rear surface-edge of the target substrate.