专利名称：OPTICAL DISPLACEMENT MEASURING
INSTRUMENT
发明人：Yutaka MIKI申请号：US12481040申请日：20090609
公开号：US20090310147A1公开日：20091217
专利附图：
摘要：A first light detector and a second light detector, in each of which a plurality oflight-receiving elements are arranged in an adjoining manner, are respectively providedanterior to an image-forming point of first reflected light and posterior to an image-
forming point of second reflected light. A focal-point detecting circuit includes: maximumvalue selectors for selecting the maximum values from sums of light-receiving signalsfrom adjoining light-receiving elements of the first light detector and the second lightdetector respectively; a total value operator for obtaining the total value of light-receiving signals from all the light-receiving elements of each of the first light detectorand the second light detector; a light-detecting-signal operator for obtaining light-detecting signals by subtracting the maximum values from the total values; and an error-signal operational circuit for outputting a difference between the light-detecting signalsto a servo circuit as a signal based on an amount of displacement between a focal pointand a measuring face.
申请人：Yutaka MIKI
地址：Kawasaki-shi JP
国籍：JP
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