Claims
- 1. A cathode-ray tube apparatus wherein unwanted leakage magnetic fluxes are controlled, comprising:
- electron beam emitting means for emitting electron beams;
- light ray producing means for producing light rays when irradiated with the electron beams;
- an envelope having an axis and enclosing said electron beam emitting means and said light ray producing means;
- deflection magnetic field generating means located outside said envelope and having a curved front section and a rear section, the front section located at a light ray producing means side of said deflection magnetic field generating means and said rear section located at an electron beam emitting side of said deflection magnetic field generating means, said deflection field generating means for generating and applying effective magnetic fluxes into said envelope to deflect the electron beam in a horizontal direction, said deflection magnetic field generating means also generating leakage magnetic fluxes extending in a direction different from that of the effective magnetic fluxes; and
- passive control means for controlling said leakage magnetic fluxes, said passive control means having a section curved along the curved front section of said deflection magnetic field generating means and directly mounted on the curved front section so that said passive control means is located across the leakage magnetic fluxes, said leak magnetic fluxes generated from the curved front section, inducing a current in said passive control means resulting in compensating magnetic fluxes being produced, said compensating magnetic fluxes controlling said leakage magnetic fluxes, said passive control means being located such that said compensating magnetic fluxes do not adversely affect said effective magnetic fluxes.
- 2. The apparatus according to claim 1, wherein said passive control means includes a first closed current path and a second current path which are symmetrical with respect to the axis of said envelope.
- 3. The apparatus according to claim 2, wherein said first and second closed current paths are electrically isolated.
- 4. The apparatus according to claim 2, wherein said first and second closed current paths are electrically connected.
- 5. The apparatus according to claim 1, wherein said leakage magnetic fluxes include magnetic fluxes which extend in an opposite direction to said effective magnetic fluxes.
- 6. The apparatus according to claim 1, further comprising auxiliary active control means, outside said envelope; and flux generating/applying means for generating magnetic fluxes and applying these magnetic fluxes to said auxiliary active control means.
- 7. The apparatus according to claim 6, wherein said flux generating/applying means generates magnetic fluxes in said auxiliary active control means which extend in a direction substantially identical to that of the leakage magnetic fluxes.
- 8. The apparatus according to claim 6, wherein said flux generating/applying means generates magnetic fluxes in said auxiliary active control means which extend in a direction substantially identical to the direction of the compensating magnetic fluxes generated by said passive control means.
- 9. A cathode-ray tube apparatus wherein unwanted leakage magnetic fluxes are controlled, comprising;
- an envelope having an axis and comprising a panel having a face plate and a skirt attached to the face plate, a funnel connected to the skirt of the panel, and a neck extending from the funnel;
- an electron gun assembly located within said neck, for emitting electron beams;
- a screen formed on said face plate, for producing light rays when irradiated with the electron beams;
- horizontal deflection means mounted on said funnel and having a curved front section and a rear section, the front section located at a screen side of said horizontal deflection means and said rear section located at an electron gun assembly side of said horizontal deflection means, said horizontal deflection means for generating deflection magnetic fields which deflect the electron beams in a horizontal direction, and horizontal deflection means also generating leakage magnetic fluxes outside said envelope; and
- closed loop conductor means extending along the skirt of said panel, along said funnel toward said horizontal deflection means, including a section curved along the curved front section of the horizontal deflection means and directly mounted on the curved front section, and crossing the leakage magnetic fluxes generated by the curved front section, said leakage magnetic fluxes inducing a current in said closed loop conductor resulting in compensating magnetic fluxes, said compensating magnetic fluxes controlling said leakage magnetic fluxes, said closed loop conductor located such that said compensating magnetic fluxes do not adversely affect said deflection magnetic fields.
- 10. The apparatus according to claim 9, wherein said closed loop conductor means includes two conductive wire members which form a first loop and a second loop, which are symmetrical with respect to the axis of said envelope.
- 11. The apparatus according to claim 10, wherein said first and second conductive wire members are electrically isolated.
- 12. The apparatus according to claim 10, wherein said first and second conductive wire members are electrically connected.
- 13. The apparatus according to claim 10, wherein said horizontal deflection means includes a flange section allowing passage of the leakage magnetic fluxes.
- 14. The apparatus according to claim 13, wherein said first and second conductive wire members each has a section extending over said flange section.
- 15. The apparatus according to claim 10, wherein said first and second conductive wire members include a third loop and a fourth loop, respectively.
- 16. The apparatus according to claim 15, wherein said third and fourth loops are mounted on said funnel.
- 17. The apparatus according to claim 15, wherein said third and fourth loops are mounted on said skirt.
- 18. The apparatus according to claim 15, wherein said third and fourth loops are located close to said neck.
- 19. The apparatus according to claim 9, further comprising auxiliary active control means outside said envelope; and flux generating/applying means for generating and applying magnetic fluxes to said auxiliary active control means.
- 20. The apparatus according to claim 19, wherein said flux generating/applying means generates magnetic fluxes in said auxiliary active control means which extend in a direction substantially identical to that of the leakage magnetic fluxes.
- 21. The apparatus according to claim 19, wherein said flux generating/applying means generates magnetic fluxes in said auxiliary active control means which extend in a direction substantially identical to the direction of the compensating magnetic fluxes generated by said closed loop conductor means.
- 22. A cathode-ray tube apparatus according to claim 9, wherein said curved section of said closed loop conductor means forms two or more loops around said horizontal deflection means.
- 23. A cathode-ray tube apparatus according to claim 9, further comprising a deflection yoke, disposed between said funnel and said neck of said envelope, including a hollow cylinder, a front flange located at a first end of said hollow cylinder, and a rear flange located at a second end of said hollow cylinder; and wherein
- said curved section of said closed loop conductor means includes first and second small loops wound around said front and rear flange, respectively.
- 24. A cathode-ray tube apparatus according to claim 9, further comprising a deflection yoke, disposed between said funnel and said neck of said envelope, including a hollow cylinder, a front flange located at a first end of said hollow cylinder, and a rear flange located at a second end of said hollow cylinder; and wherein
- said closed loop conductor means includes said curved section forming a first loop wrapped around in front of said front flange and a second section forming a second loop mounted on top of said panel of said envelope.
- 25. A cathode-ray tube apparatus for suppressing leakage magnetic flexes, comprising:
- electron beam emitting means for emitting at electron beam;
- light ray producing means for producing light rays when irradiated with said electron beam;
- an envelope having an axis and enclosing said electron beam emitting means and said light ray producing means;
- deflecting magnetic field generating means, located on said envelope and having a front and rear edge section, for generating and applying effective magnetic fluxes in said envelope to deflect the electron beam in a horizontal direction, and also generating first and second leakage magnetic fluxes extending in a direction different from that of said effective magnetic fluxes, the first leakage magnetic fluxes being greater in magnitude than said second leakage magnetic fluxes and being substantially distributed between said front edge section and said light ray producing means, and said second leakage magnetic fluxes being substantially distributed between said rear edge section and said electron beam emitting means; and
- passive control means, including a pair of closed loops each of which having a portion mounted on said front edge section, for controlling said first and second leakage magnetic fluxes, said pair of closed loops being arranged on said envelope so as to be substantially symmetrical to said axis in order to receive said first leakage magnetic fluxes, whereby a current is electromagnetically induced in each of said closed loops when said first leakage magnetic fluxes are applied to said closed loops, thereby generating compensating magnetic fields from the closed loops.
- 26. A cathode-ray tube apparatus for suppressing leakage magnetic fluxes, comprising:
- an envelope having an axis and comprising a panel having a face plate and a skirt attached to said face plate, a funnel connected to said skirt of said panel, and a neck extending from said funnel;
- an electron gun assembly located within said neck, for emitting electron beams;
- a screen formed on said face plate, for producing light rays when irradiated with said electron beams;
- horizontal deflection means mounted on said funnel and having a front and rear edge section, for generating deflection magnetic fluxes to deflect said electron beams in said envelope in a horizontal direction, and also for generating first and second leakage magnetic fluxes in a direction different from that of said deflection magnetic fluxes, said first leakage magnetic fluxes being greater in magnitude than said second leakage magnetic fluxes and being substantially distributed between said front edge section and said screen, and said second leakage magnetic fluxes being substantially distributed between said rear edge section and said electron gun assembly; and
- a pair of closed loop conductors arranged so as to be substantially symmetric with respect to said axis; each of said conductors extending along said skirt of said panel and also along said funnel toward said horizontal deflection means and having a part located on said front edge section, wherein said conductors cross said first leakage magnetic fluxes, thereby inducing a current to be generated in said conductors and causing compensating magnetic fluxes to be generated.
Priority Claims (1)
Number |
Date |
Country |
Kind |
1-225649 |
Aug 1989 |
JPX |
|
Parent Case Info
This is a continuation of application Ser. No. 07/856,810, filed on Mar. 24, 1992 and now abandoned which was a continuation of application Ser. No. 07/543,398, filed on Jun. 26, 1990, now abandoned.
US Referenced Citations (15)
Foreign Referenced Citations (7)
Number |
Date |
Country |
0371618 |
Jun 1990 |
EPX |
58-104591 |
Jun 1983 |
JPX |
62-64024 |
Mar 1987 |
JPX |
62-193048 |
Aug 1987 |
JPX |
62-223952 |
Oct 1987 |
JPX |
8706054 |
Oct 1987 |
WOX |
8804469 |
Jun 1988 |
WOX |
Continuations (2)
|
Number |
Date |
Country |
Parent |
856810 |
Mar 1992 |
|
Parent |
543398 |
Jun 1990 |
|