Method of detecting the position of an optical head
CA 1270059 C · Owner: Minoura, Kazuo · Inventors: Matsuoka, Kazuhiko; Kawaguchi, Fumiaki; Enari, Masahiko
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
In the method according to the present invenion before data are recorded on an optical card or the data recorded on the card are reproduced, an optical head for applying a light beam to the optical card and the optical card are displaced relative to each other in the direction of track of the optical card and a track number written on the optical card is read to thereby detect the position of the optical head relative to the optical card.
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 June 5, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 5, 2007.
- 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.