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US 2006/0132761 A1Published application
Apparatus and method for detecting lens thickness
AssigneeNovartis AG
InventorWilliam Hall
Life of this patent
Estimating the term…
Abstract
The present invention relates to a non-contact/non-destructive method and apparatus for measuring the thickness of an ophthalmic lens. The present invention also provides a method for inspecting or measuring the base curve of a lens.
Claims29
A device for presenting an ophthalmic lens for inspection comprising:
- An illumination source in optical connection with;
- an imaging system adapted to measure the distance of the lens;
- a measurement chamber in optical connection with said illumination source and said imaging system;
- a rotating fixture connected to said measurement chamber via an adapter;
- and
- a seat in said measurement chamber adapted to support a sample lens, wherein said seat is rotated by the rotating fixture, and
- wherein said device is adapted to measure the thickness of said ophthalmic lens.
4 more elements
A method for measuring the thickness of an ophthalmic lens comprising:
- Providing an illumination source, and imaging system and a measurement seat;
- Taking one set of images comprising the steps of
- Taking a first image of said measurement seat
- Placing a sample lens on said measurement seat
- Taking a second image of said lens on said measurement seat;
- and
- Subtracting the first image from the second image to obtain a thickness measurement.
4 more elements
A method for measuring the thickness of an ophthalmic lens comprising:
- Providing an illumination source, an imaging system, a measurement chamber and a measurement seat;
- Calibrating the illumination source, imaging system, measurement chamber, and measurement seat;
- Filling the measurement chamber with a medium;
- Taking one set of images comprising the steps of
- Finding the edge contour of the measurement seat
- Taking a first image of said measurement seat
- Activating a vacuum pump;
- Placing a sample lens on said measurement seat
- Finding the edge contour of said sample lens
- Taking a second image of said lens on said measurement seat;
- Subtracting the first image from the second image to obtain a thickness measurement;
- and
- Converting the thickness measurement to a three-dimensional thickness profile.
10 more elements
A system comprising:
- An illumination source in optical connection with an imaging system;
- an imaging system adapted to measure the distance to said lens;
- a measurement chamber in optical connection with said illumination source and said imaging system;
- a rotating fixture connected to said measurement chamber via an adapter;
- and
- a seat in said measurement chamber adapted to support a sample lens, wherein illumination source illuminates said sample lens to allow said imaging system to locate said lens and measure the thickness of said lens.
3 more elements
Dependencies are inferred from the claim text.