OPTICAL DISTANCE MEASURING APPARATUS

    公开(公告)号:DE2861769D1

    公开(公告)日:1982-06-09

    申请号:DE2861769

    申请日:1978-11-27

    Applicant: IBM

    Abstract: A system for measuring the lateral displacement between edges located on two spaced apart objects, with a precision in the order of 1 microinch, generates and analyses the diffraction pattern produced by the physical edge on one object and the aerial image of the edge on the other object. The system can be used for the alignment of the objects or the comparison of patterns located on the objects.

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