Method and apparatus for measuring a three-dimensional curved surface shape
CA 1294426 C · Owner: Uesugi, Mitsuaki · Inventors: Inomata, Masaichi; Uesugi, Mitsuaki; Komine, Isamu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus adapted to measure a threedimensional curved surface shape quantitatively with high speed. A pattern of interference fringes on a surface of an object to be measured is picked up so that while moving a reference plane (or the object to bemeasured) in the direction of an optical axis, the resulting video signal is processed to form a composite image in which a value of each of picture elements is represented by a position of the reference plane (or a position of the object to be measured) at an instant that one of positions on the object surface corresponding to that picture element in the image attains a maximum brightness. Then, a three-dimensional curved surface …
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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.
Why it's free to use
- Granted January 21, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 21, 2009.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
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Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.