Lens meter without relatively moving optical parts

Details Lens meter without relatively moving optical parts Lens meter without relatively moving optical parts

1977-06-06

1978-12-19

Corbin, John K.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

356127, G01B 900

Patent

active

041303610

ABSTRACT:
A lens meter for analyzing suspect lenses in terms of sphere, cylinder and axis by optical beam deflection and without relatively moving optical parts is disclosed. A light source emanating a substantially collimated beam of light from an entrant aperture into a retroreflecting mechanism includes two important properties. The first property is that an image of the entrant aperture is displayed from and reimaged across the optical axis of the retroreflector to a conjugate location at a real image exit aperture, this aperture being provided with a coincident optical stop. Secondly, in the absence of a test lens in the light path, light entrant to the retroreflector through the entrant aperture along a first path departs the real image of the exist aperture along a second path with a known angularity to the first path. Assuming that a suspect lens containing components of sphere and cylinder is interposed to the entrant and exit aperture, this angular deviation changes across the lens sampling entrant-exit aperture base leg. Specifically, the changed angular deviation is a function of sphere and cylinder present in the suspect lens. By algebraic summing of the resultant angular deviations, the power of the suspect lens can be measured in sphere, cylinder and axis either by notation in sphere and cross-cylinder components or by more conventional sphere, cylinder and axis notation. Provision is easily made to detect prism.

REFERENCES:
patent: 3870415 (1975-03-01), Cornsweet
patent: 4007990 (1977-02-01), McDevitt et al.

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