Servo for a rotary head drum of vtr
CA 1329258 C · Owner: Sony Corporation · Inventors: Tomitaka, Tadafusa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A servo circuit for controlling a rotation of a drum motor to rotate a rotary head drum having a frequency generating circuit for generating a frequency signal corresponding to a revolution speed of a drum motor a cycle, detector circuit for detecting a cycle of the frequency signal from the frequency generating circuit a detector, circuit for detecting a speed deviation between a detected signal from the detector circuit and a reference signal to produce a speed deviation signal, a first circuit for generating a first rotation control signal based on the speed deviation signal, a second circuit for producing a second rotation control signal based on phase difference data obtained by …
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 May 3, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 3, 2011.
- 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.