Lens meter with target orthogonalizer

Details Lens meter with target orthogonalizer Lens meter with target orthogonalizer

1975-06-24

1976-06-01

Corbin, John K.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

351 13, G01B 900, A61B 310

Patent

active

039604500

ABSTRACT:
A lens meter for measuring the focal length of a sample lens with the sample lens disposed in a collimated light beam comprises a target, a first lens for forming an image of the target, light beam splitter means in the light beam on the image forming side of the first lens for splitting the light beam to form a second target image, a second lens having its focal points on the first and second target images through the light beam splitter means, target orthogonalizing means provided between the first and second lenses for making the first and second target images orthogonal to each other, a third lens for focusing the orthogonal target images collimated by the second lens, and target viewing means disposed at the focal point of the third lens.

REFERENCES:
patent: 3389632 (1968-06-01), Plummer
patent: 3558207 (1971-01-01), Worthington

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