Substrate Holding Table Grooves for Swarf-Free Back Surface Processing

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Solution Overview

Problem

Existing processing technologies fail to address the contamination of a back surface of a substrate due to processing swarf sneaking into the back surface of the substrate, which deteriorates processing quality.

Innovation Solution

A processing apparatus with a holding table and processing unit, featuring a holding surface with a discharge groove and outer circumferential groove that collects processing swarf and liquid, and a cutting blade that removes the outer circumferential portion of the substrate while supplying cutting water.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the holding surface is used to hold the substrate during processing, then the substrate can be securely positioned, but processing swarf can sneak into the back surface of the substrate and cause contamination

Engineering Contradiction:

Improvesubstrate positioning stabilityVSAvoidback surface contamination

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The holding surface is segmented into multiple functional zones: a holding section for secure substrate positioning, a discharge groove for swarf collection, and an outer circumferential groove for additional containment. This segmentation allows each zone to perform its specific function independently, preventing swarf from reaching the back surface while maintaining positioning stability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The discharge groove acts as an intermediary structure between the holding section and the external environment. It intercepts processing swarf before it can sneak under the substrate and contaminate the back surface, effectively mediating the harmful effect while preserving the substrate-holding function.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Device complexity

If the outer circumferential portion of the substrate is not held under suction, then the holding surface can be kept simple, but flapping occurs during processing which allows swarf to enter the back surface

Engineering Contradiction:

Improveholding surface structureVSAvoidprocessing quality

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The holding surface is divided into a central holding section and an outer circumferential groove zone. The outer groove is configured to hold under suction the outer circumferential portion of the substrate, preventing flapping without requiring complex modifications to the entire holding surface structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The outer circumferential groove utilizes suction (pneumatic pressure differential) to hold the outer circumferential portion of the substrate. This pneumatic mechanism effectively prevents flapping and maintains processing precision while keeping the overall structure relatively simple.

Inventive Principle:

Principle #29Pneumatics and hydraulics

3Object-affected harmful factors

If a discharge groove is added to collect processing swarf, then back surface contamination is prevented, but the holding surface structure becomes more complex

Engineering Contradiction:

Improveback surface contaminationVSAvoidholding surface structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The discharge groove structure merges multiple functions into a single integrated component: it serves as both a swarf collection channel and part of the substrate holding mechanism through suction. This merging reduces the need for separate components, thereby limiting the increase in overall structural complexity.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The outer circumferential groove performs multiple functions simultaneously: it collects processing swarf, holds the outer circumferential portion of the substrate under suction to prevent flapping, and contributes to the overall structural integrity. This multi-functionality justifies the added structural elements by delivering multiple benefits from a single feature.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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

Maintains high processing quality by preventing processing swarf from contaminating the back surface of the substrate, effectively collecting swarf and liquid through discharge grooves.

Implementation Method 1

an outer circumferential groove that surrounds the discharge groove and communicates with a suction source to hold under suction the substrate

Methodology Applied

Scientific EffectSuction: Suction

Implementation Method 2

processing swarf produced by the processing unit is collected by the discharge groove

Methodology Applied

Scientific EffectGravitation: Gravitation

Data Source

PatentUS12604699B2Processing apparatus

Publication Date: 2026.04.14 DISCO CORP

AI summary

A processing apparatus includes a holding table including a holding surface that holds a back surface side of a substrate and a processing unit that processes the substrate held on the holding surface. The holding surface includes a holding section that holds a central region of the substrate, a discharge groove that surrounds the holding section, and an outer circumferential groove that surrounds the discharge groove and communicates with a suction source to hold under suction the substrate. The processing apparatus uses the discharge groove to collect processing swarf produced by the processing unit.