Optical pickup device for optical recording/reproducing apparatus
CA 2108095 A1 · Owner: Nec Corporation · Inventors: Ohashi, Kaoru
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An optical pickup device for an optical recording/reproducing apparatus includes a stationary optical system unit, an objective lens a leaf spring, type focusing actuator, an optical path changing unit and a carriage. The stationary optical system unit emits a laser beam and reads an error signal and a data signal from light reflected by a recording medium. The objective lens focuses the laser beam from the stationary optical system onto the recording medium. The leaf spring type focusing actuator drives the objective lens in only a focusing direction. The optical path changing unit changes a course of the laser beam emitted from the stationary optical system unit to the recording medium …
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
- Filed October 8, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 8, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 8, 2015.
- 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.