Crt focus utilising magnetic means
CA 1320531 C · Owner: Joshi, Shrikrishana N. · Inventors: Joshi, Shrikrishana N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The focus of an electrostatically focused CRT may be improved by placing a split resilient ring around the neck of the CRT having radiating posts which receive ring magnets magnetised across their diameter. The ring may be translated along the neck of the CRT in the vicinity of the cathode and the magnets oriented to bunch the electron beam from the cathode and move it onto the axis of the focusing electrode. Bunching improves the electron density distribution within the spot. The magnet mounted on the ring may be turned to counteract the perturbations due to the excessive field penetration of the yoke in the low beam velocity region. A d.c. bias is added to the yoke current to compensate …
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 July 20, 1993. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 20, 2010.
- 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.