Grinding Apparatus Setup by Contact-Based Origin Detection

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Solution Overview

Problem

Existing grinding apparatus setups that use a sensor are expensive, while setups using a setup block are time-consuming, and both methods require additional equipment or components.

Innovation Solution

A method for setting up a grinding apparatus that includes a chuck table, grinding mechanism, lift mechanism, and height ascertainment device, utilizing a contact detection section to determine the origin point height of the grinding mechanism without a sensor, by forming a cushioning portion between the workpiece and holding surface to reduce contact impact and enable quick setup.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If a sensor is used for setup, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:

Improveheight measurement precisionVSAvoidsensor addition

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent introduces a setup block as an intermediary object between the grinding stones and the workpiece. This setup block serves as a mediator that enables height measurement through mechanical interaction (contact detection) rather than requiring expensive sensors. The setup block with its specific height allows the system to determine the origin point height of the grinding mechanism through contact-based detection, resolving the contradiction between measurement precision and device complexity.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a simple, inexpensive setup block instead of expensive sensors. The setup block is a basic mechanical component that can be easily manufactured and replaced if needed. It performs the measurement function through its physical dimensions and contact properties, providing a cost-effective alternative to sophisticated sensing equipment while maintaining sufficient measurement precision for the setup process.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Device complexity

If a setup block is used for setup, then device complexity is reduced, but productivity deteriorates due to longer setup time

Engineering Contradiction:

Improveno sensor requiredVSAvoidsetup time

Core Design Contradiction:

Device complexityVSProductivity

Solution Approach 1:

The patent implements preliminary actions to streamline the setup process: (1) The setup block is pre-positioned on the workpiece at a known location before the grinding stones are lowered. (2) The system performs a rough positioning of the grinding mechanism before the final contact detection. (3) The contact detection section is pre-configured to recognize the specific contact pattern with the setup block. These preliminary actions reduce the time needed for the actual height measurement and origin point determination, improving productivity while maintaining the simplicity of using a setup block rather than sensors.

Inventive Principle:

Principle #10Preliminary action

3Loss of time

If grinding stones are lowered directly onto workpiece, then setup time is reduced, but harmful factors increase due to impact damage

Engineering Contradiction:

Improvesetup timeVSAvoidimpact damage to grinding stones

Core Design Contradiction:

Loss of timeVSObject-affected harmful factors

Solution Approach 1:

The patent applies beforehand cushioning by positioning the setup block between the grinding stones and the workpiece before the grinding stones are lowered. The setup block acts as a cushioning element that absorbs the impact when the grinding stones make contact. This pre-positioned cushioning protection prevents damage to the expensive grinding stones while enabling rapid setup through direct contact detection, resolving the contradiction between setup time and impact damage prevention.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The setup block serves as an intermediary that protects the grinding stones from direct impact with the workpiece. By placing the setup block in between, the system allows the grinding stones to contact the setup block (which is designed to withstand or absorb the impact) rather than directly contacting the workpiece or experiencing uncontrolled impact forces. This intermediary protection enables faster setup while preventing harmful impact damage.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12447584B2Setup method

Publication Date: 2025.10.21 DISCO CORP

AI summary

Stored is a height of a grinding mechanism when lower surfaces of grinding stones have come into contact with an upper surface of a wafer held on a holding surface, through lowering of the grinding mechanism from above the wafer. Based on this height, an origin point height which is a height of the grinding mechanism when the lower surfaces of the grinding stones have come into contact with the holding surface is then determined.