Transfer detection method and substrate processing apparatus

    公开(公告)号:US12159798B2

    公开(公告)日:2024-12-03

    申请号:US17298768

    申请日:2019-11-19

    Abstract: Provided is a transfer detection method for use in a substrate processing apparatus including a transfer arm, which has a plurality of substrate holders and is configured to transfer a plurality of substrates to a plurality of stages between a first chamber and a second chamber adjacent to the first chamber by using the plurality of substrate holders, and an optical sensor provided in a vicinity of an opening via which the first and second chambers are in communication with each other, the method including: projecting a light beam having a horizontal optical axis parallel to the opening to a position through which the substrates held by the plurality of substrate holders pass; and determining at least one of a state of the substrates on the substrate holders and a state of the transfer arm, in response to a detection result of the light beam projected from the optical sensor.

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