METHOD, SUBSTRATE AND SYSTEM FOR ESTIMATING STRESS IN A SUBSTRATE

    公开(公告)号:US20220113640A1

    公开(公告)日:2022-04-14

    申请号:US17423818

    申请日:2019-11-05

    Abstract: The present invention provides a testing substrate (W) for estimating stress in production substrates due to a substrate support, said testing substrate having a support surface (SS) divided into predefined portions, wherein the predefined portions comprise at least one first portion (1) having a first coefficient of friction being substantially uniform across the at least one first portion, and at least one second portion (2) having a second coefficient of friction being substantially uniform across the at least one second portion, wherein the second coefficient of friction is different to the first coefficient of friction. The present invention also provides a method for estimating stress in a substrate due to a substrate support and a system for making such an estimation.

    METHOD OF CLAMPING A SUBSTRATE TO A CLAMPING SYSTEM, A SUBSTRATE HOLDER AND A SUBSTRATE SUPPORT

    公开(公告)号:US20220082952A1

    公开(公告)日:2022-03-17

    申请号:US17533947

    申请日:2021-11-23

    Abstract: A method including: generating a first force to attract a substrate holder to a support surface, the holder including a body having opposing first and second body surfaces, first burls at the first body surface, wherein each first burl has a distal end to support a substrate, and second burls at the second body surface to support the substrate holder on the support surface through contact with distal ends of the second burls; generating a second force to attract the substrate to the substrate holder; and controlling the first force and/or second force in a release step to deform the body between the second burls such as to create a gap between the distal ends of a first subset of the plurality of first burls and the substrate and such that the substrate is supported on distal ends of a second subset of the plurality of first burls.

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