Method and apparatus for determining the optical properties of a

Details Method and apparatus for determining the optical properties of a Method and apparatus for determining the optical properties of a

1992-03-13

1994-04-05

Rosenberger, Richard A.

Optics: measuring and testing

Lens or reflective image former testing

Focal length measuring

356127, G01B 900

Patent

active

053010043

ABSTRACT:
Optical properties of a lens, including localized defects, are determined by analyzing the refracted image produced by transmitting a beam of light through an aperture and a lens to be tested. The image is reflected onto a light sensitive detecting surface. Information obtained from the light detecting surface is digitized and sent to an Image Processing Unit which calculates the optical properties of the lens. The aperture may consist of a single shaped opening or alternatively a plurality of concentric, annular rings. Correction lenses may be employed, either permanently or selectively, to alter the refracted beam before the beam intersects the detecting surface.

REFERENCES:
patent: 3880525 (1975-04-01), Johnson
patent: 4275964 (1981-06-01), Vassiliadis
patent: 4828385 (1989-05-01), Fukuma et al.
patent: 5123735 (1992-06-01), Hegarty
Vol. 9, No. 224 (P-387) (1947) Sep. 10, 1985, JP, A, 60-82830 (Canon K.K.) May 11, 1985.
Vol. 11, No. 134 (P-571) (Apr. 28, 1987), JP, A, 61-275710 (Hoya Corp.) Dec. 5, 1986.

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