Geometrical instruments – Miscellaneous – Light direction
Patent
1982-04-21
1985-01-08
Haroian, Harry N.
Geometrical instruments
Miscellaneous
Light direction
33434, 33125C, 33 1N, B43L 1308
Patent
active
044920318
ABSTRACT:
A vernier device of the digital display type for a universal parallel ruler is disclosed comprising a slit protractor having slits arranged at the same visually readable protractor and a intervals as those intervals for the protractor graduations, the slit protractor being provided on one of a stationary portion and a rotatable portion of a scale operating head. A slit vernier protractor having slits at other intervals for vernier graduations is provided, the slit vernier protractor being provided on the other of the two portions of the operating head. An encoder consisting of photoconductive elements and corresponding light-emitting elements is provided with the slit protractor graduations and the slit vernier graduations interposed therebetween wherein a fine vernier angle is digitally displayed for reading on the basis of a signal representing a coincidence between a slit vernier graduation and a corresponding slit protractor graduation.
REFERENCES:
patent: 2993200 (1961-07-01), Wacker et al.
patent: 4151649 (1979-05-01), Tatsuzawa
patent: 4367589 (1983-01-01), Mainka et al.
Asahi Seimitsu Kabushiki Kaisha
Haroian Harry N.
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