Apparatus for optically detecting information signals on a carrier
CA 1099815 A · Owner: Sony Corporation · Inventors: Naruse, Yohsuke; Sugiki, Mikio; Yamamoto, Masanobu
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In an apparatus for optically detecting information signals in which light beams for reading information signals and for tracking servo-control are incident on a signal record surface of an optical record carrier through an objective lens so that respective beam spots of the light beams are formed on the signal record surface of the optical record carrier on which a signal record track is formed and a driving operation for a tracking control mirror and a detecting operation for recorded signals on the signal record surface are effected by the use of reflected light beams from the signal record surface the improvement comprising a time base correction mirror disposed near the objective lens …
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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 April 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 21, 1998.
- 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.