Optical scanning unit
CA 1280823 C · Owner: Van Sluys, Robert Nestor Joseph · Inventors: Van Sluys, Robert Nestor Joseph; Gijzen, Wilhelmus Adrianus Henricus; Honds, Leo
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
SUMMARY, "Optical scanning unit", Optical scanning unit with an objective (5) with an optical axis for the focussing of a beam of rays into a scanning spot on the surface of an information carrier. The scanning unit also has an electromagnetic drive device for correcting the position of the objective with respect to the information carrier, the drive device being equipped with an objective mounting (7) for the objective. The objective mounting has a moving magnetic body (200) of a permanent-magnetic material which is arranged coaxially about the optical axis and is equipped with magnetic poles. The drive device is further equipped with fixed coils (204, 205, 206) which interact with the …
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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 February 26, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended February 26, 2008.
- 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.