Digital micrometer

Details Digital micrometer Digital micrometer

1978-06-12

1980-08-26

Stearns, Richard R.

Geometrical instruments

Area integrators

Electrical

33DIG3, G01B 318, G01B 702

Patent

active

042188237

ABSTRACT:
A photoelectrically readable digital micrometer for precisely measuring a micro distance includes an outer ring having a micro internal thread, a spindle shaft having an external thread screwed into the internal thread, a disc-shaped scale plate having a scale provided around the periphery of the plate surface, the scale plate being secured to the spindle shaft perpendicular to the plate surface, a slidable ring slidably mounted on the outer ring and being slidable in the axial direction together with the spindle shaft, and a light source member and a light receiving member secured to the slidable ring and sandwiching the scale of said scale plate.

REFERENCES:
patent: 3482321 (1969-12-01), Inshaw
patent: 3686766 (1972-08-01), Matumoto
patent: 3877149 (1975-04-01), Masuda
patent: 3995156 (1976-11-01), Angersbach et al.

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