Geometrical instruments – Area integrators – Electrical
Patent
1979-05-03
1980-10-28
Martin, Jr., William D.
Geometrical instruments
Area integrators
Electrical
33125A, G01B 702, G01B 502
Patent
active
042298830
ABSTRACT:
A measuring instrument with digital display including a relatively elongate caliper body formed with a measuring part adapted to make measuring engagement with an article to be measured and a slider freely slidable in a longitudinal direction of the caliper body and formed with a measuring part disposed opposite to the measuring part of the caliper body. In the measuring instrument a transparent linear scale is fixedly disposed on the caliper body with its axis extending in the longitudinal direction of the caliper body and a transparent index scale is mounted on the slider with its calibrated face disposed opposite to the calibrated face of the linear scale and slightly spaced apart relationship. A measuring circuit including a digital display element is mounted in the slider and is electrically connected to a light emitting element and a light receiving element mounted in the slider. The light emitting element and the light receiving element are disposed opposite to each other with the linear scale and the index scale interposed thereinbetween.
REFERENCES:
patent: 3142121 (1964-07-01), Stefanov
patent: 4008523 (1977-02-01), von Voros
patent: 4037325 (1977-07-01), Weber et al.
patent: 4151649 (1979-05-01), Tatsuzawa
Martin, Jr. William D.
Mitutoyo Mfg. Co. Ltd.
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