Apparatus for optically detecting informations recorded on a carrier
CA 1109960 A · Owner: Sony Corporation · Inventors: Naruse, Yohsuke; Okada, Hitoshi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An apparatus for optically detecting informations recorded on a carrier in which a main light beam for reading out the recorded informations and an additional light beam used for focus servocontrol are respectively incident through a common objective lens on the carrier the paths of the light beams are subjected to the control by beam path control means, for example a tracking, servocontrol device or a time base correction control device, provided for changing simultaneously these paths through the objective lens in response to a beam path control signal, and an additional focus control device is provided for improving the focus servocontrol operating in cooperation with the additional …
Read the whole patent
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 September 29, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended September 29, 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.