An absolute optical encoder with analog variable-phase sinusoidal output
CA 2257549 A1 · Owner: Bloechle, Walter · Inventors: Bloechle, Walter
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention represents a new method for reading the position of an encoding mask. This method significantly increases the resolution without increasing the, encoding mask resolution. An array of light cells is placed at one side of an encoding mask and consists of four, elements. An array of photocells is placed on the other side and also consists of four, elements. All cells in a photocell array are exposed in cell-by-cell order with 50%, overlapping. The distance between cells in a light cell array is equal to the distance, between cells in a photocell array. A photocell array is aligned with a light cell array. The output signal from a photocell array is made by …
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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
- Filed January 5, 1999. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended January 5, 2019.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 5, 2021.
- 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.