Optics: measuring and testing – Lens or reflective image former testing – For optical transfer function
Patent
1982-01-05
1985-04-30
Rosenberger, R. A.
Optics: measuring and testing
Lens or reflective image former testing
For optical transfer function
350633, G01B 900
Patent
active
045140863
ABSTRACT:
An apparatus for measuring refractive properties of transmissive elements such as ophthalmic lenses, including a mirror or deflective surface supported for adjustable movement in X and Y directions in order to deflect a light or other beam onto a detector which provides an output proportional to the deviation of the deflected beam from a null point when a lens or other transmissive element is positioned in the beam path; the output being arranged to drive a pair of servomotors, each coupled to a potentiometer connected to electrical circuits for indicating the position of the mirror or deflective surface in the X and Y directions and in conjunction with the light detector output, to return the deflected beam to the null point; simultaneously varying the resistance of the coupled potentiometers whereby the voltage output of the electrical circuits indicate refractive properites of the lens/transmissive elements.
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Rosenberger R. A.
Wessendorf, Jr. Walter F.
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