Magnetic field generators for use in electromagnetic focusing type cathode ray tubes
AssigneeHitachi, Ltd.
InventorsKuniharu Osakabe, Isao Yoshimi, Soichi Sakurai
Life of this patent
Estimating the term…
Abstract
In a magnetic field generator mounted about a neck of a cathode ray tube for focusing an electron beam and made up of a permanent magnet, a magnetic field adjusting mechanism for adjusting field intensity produced by the permanent magnet and a magnetic member adapted to compensate for a temperature characteristic of the permanent magnet, the temperature characteristic compensating member is located at a position not affected by magnetic flux adjusted by the magnetic field adjusting mechanism.
Claims6
In a magnetic field generator for use in an electromagnetic focusing type cathode ray tube of the type wherein the magnetic field generator is disposed on the outside of said cathode ray tube for focusing an electron beam in the tube and composed of a permanent magnet, a magnetic field adjusting mechanism for adjusting field intensity produced by said permanent magnet, and a magnetic member adapted to compensate for a temperature characteristic of said permanent magnet the improvement wherein said temperature characteristic compensating member is located at a position not affected by magnetic flux adjusted by said magnetic field adjusting mechanism.
Dependencies are inferred from the claim text.