Apparatus and method for determining the refractive characterist

Details Apparatus and method for determining the refractive characterist Apparatus and method for determining the refractive characterist

1979-05-18

1981-06-30

Rosenberg, Richard

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

356127, G01B 900

Patent

active

042759641

ABSTRACT:
An automatic lensmeter (48) for determining the refractive properties of a test lens (76) including optics (52, 58, 62, 64, 68, 70, 72, 74) for producing a collimated, nonrotational beam of light, equally disposed about and propagating along an optical axis (50), which is refracted by the test lens (76), a nonrotational mask (18) having an annulus (24) for generating a stationary elliptical loop (28) of light at a detecting plane (26), the loop (28) having a shape, size and location dependent on the refractive properties of the test lens (76), and a photodetector (31) at the plane (26) to intercept the loop 28. The lensmeter (48) has no moving optical components and, due to the loop 28, provides an infinite number of points to determine very accurately one or more of the refractive properties, thereby overcoming problems with prior automatic lensmeters having relatively rotational optics and/or providing a finite number of points at a detecting plane.

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