Optical disk drive device
CA 1306805 C · Owner: Ogawa, Masaharu · Inventors: Ogawa, Masaharu; Nakatsu, Keiji; Kamitsu, Katsuaki
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A retract means comprises the signal instruction circuit for providing the number of tracks to be traversed the, access start instruction and the retract instrution and the reference voltage generating circuit responsive to these instructions to provide the residual track number and the carriage moving signal and operates such that immediately before, the drive device is stopped to operate the carriage mounting the, optical head thereon is moved by the access operation from any track to the first predetermined position according to the access start instruction and then moved from the first predetermined position to the second predetermined position according to the retract instruction at a …
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 August 25, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 25, 2009.
- 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.