Quantitative lense analysis technique
CA 1310205 C · Owner: Barr, Roger L. · Inventors: Barr, Roger L.; Sisler, Sharon B.; Farrell, Timothy R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method and apparatus is provided to quantitively characterize a lense or optical system as to best focus position at various locations of the lense as well as to determine the curvature or focal surface and, the relative depth of focus of the various locations. A test vehicle is provided having an array of object groups, each object group being comprised of a small object having a size about equal to the resolution limit of the lense or optical system and a large object having a size substantially larger than the resolution limit of the lense or optical system, the groups being separated by opaque areas. The test vehicle is interposed in the lense path and the focal length set at a …
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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 November 17, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 17, 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
Timeline From CIPO dates
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.