Geometrical instruments – Area integrators – Electrical
Patent
1978-01-11
1979-10-23
Stearns, Richard R.
Geometrical instruments
Area integrators
Electrical
33147F, 33147N, 33174L, G01B 702, G01B 706
Patent
active
041715764
ABSTRACT:
The invention relates to apparatus for measuring the curvature of curved objects such as a lens, and is particularly related to measuring the curvature of hydrophilic pliable contact lenses for use in ophalmology.
The apparatus comprises an annular collar to support the lens being measured, a pointed contacting plunger means for guiding the latter, means for moving said plunger in relation to said support, electrical means to set up a difference in potential between the plunger and the lens support, the two latter being made of electrically conductive material, means for detecting the passage of electrical current between the plunger and the support, a measuring system, and an electronic processing assembly which receives the above signals and which is adapted to store the value of the measurement signal at the moment when the signal from the detecting means appears.
While the invention may in particular be applied to the measurement, under conditions of notable accuracy and speed, of the radius of curvature of the concave face of a pliable contact lens, it may also be employed to measure the radius of curvature of any similar curved object.
REFERENCES:
patent: 1961764 (1934-06-01), Horstkotte
patent: 2566970 (1951-09-01), Swensson
patent: 3135055 (1964-06-01), Butler et al.
patent: 3315367 (1967-04-01), Walsh et al.
patent: 3795054 (1974-03-01), Kinney
patent: 3844047 (1974-10-01), Carson
Agras Michel
Lagorsse Bernard
Medicornea (Societe Anonyme)
Stearns Richard R.
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