JP3534828B2 - Deflection yoke - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a deflection yoke used for a television receiver or the like. 2. Description of the Related Art Conventionally, a deflection yoke employs a coma collector (magnetic material) which collects a leakage magnetic field of a vertical deflection magnetic field generated by a vertical deflection coil and forms a dipole magnetic field in a small diameter portion of the deflection yoke. ing. FIG. 7 is a view showing the whole of a conventional deflection yoke, and FIG. 8 is a partially enlarged view of a coma collector. Reference numerals 12 and 12a are frame collectors. 1
Reference numeral 3 denotes a vertical deflection coil, 14 denotes a toroidal core, 15 denotes a leakage magnetic field of a vertical deflection magnetic field, and 16 denotes a magnetic field generated by a coma collector. Reference numeral 17 denotes a magnetic field line collection unit, and a frame collector 12
It is provided in. Reference numeral 18 denotes a magnetic field line emitting unit, which forms a bipolar magnetic field by the magnetic field collected by the magnetic field line collecting unit 17. Normally, the bipolar magnetic field produced by the coma collector has a symmetrical shape. However, due to the misalignment of the left and right windings of the vertical deflection coil and the distortion of the toroidal core, etc. The vertical deflection magnetic field becomes left-right asymmetric, which may cause misconvergence (color shift) as shown in FIG. In FIG. 9, reference numeral 19 denotes an emission line of a red beam;
Numeral 20 denotes a bright line of a blue beam. If the magnetic field generated by the coma collector can be made asymmetrical so as to cancel the asymmetry of the vertical deflection magnetic field, misconvergence can be solved, but the conventional coma collector is provided symmetrically. Therefore, it cannot be solved as it is. Conventionally, when the deflection yoke itself is swung right and left as shown in FIG. 10, the electron beam is deflected when the force received by the bright line 21 of the red beam and the force received by the bright line 22 of the blue beam are different. In order not to pass through the center of the yoke (shifted to the left in FIG. 11), the force applied to the red beam and the force applied to the blue beam were made equal to correct the misconvergence. 12, the image frame 23 is distorted in a horizontal trapezoidal shape as shown in FIG. SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned conventional problems and to make the dipole magnetic field generated by the coma collector asymmetrical in the left-right direction to eliminate the left-right deviation of the vertical deflection magnetic field. In order to achieve the above object, the present invention provides a magnetic field line collecting device for collecting a leakage magnetic field of a vertical deflection magnetic field created by a vertical deflection coil in a small diameter portion of a deflection yoke used for a cathode ray tube. parts and the magnetic field collected by the magnetic line collecting portion provided coma collector and a magnetic field lines emitting portion forming a 2-pole magnetic field (magnetic), this frame collector
A portion where the magnetic field line collecting section is continuous from the magnetic field line emitting section.
The magnetic field line collecting unit
The deflection yoke has a variable length in the tube axis direction . [0010] The sliding of the magnetic flux collecting part provided in the top collector is possible.
With a magnetic field line collector to make the overall length variable.
Therefore, it is possible to change the collection amount of the leakage magnetic field of the vertical deflection magnetic field,
It is possible to adjust the dipole magnetic field generated in the magnetic field emission part. FIG. 1 is a view showing an entire deflection yoke according to the present invention. 1, 1a are top collectors. Reference numeral 2 denotes a vertical deflection coil, 3 denotes a toroidal core, 4 denotes a leakage magnetic field of a vertical deflection magnetic field, and 5 denotes a magnetic field generated by a coma collector. Numeral 6 denotes a magnetic field line collecting unit, which is provided on the top collector 1, and is capable of contracting in the direction of the cathode ray tube. Numeral 7 denotes a magnetic field emission part which generates a dipole magnetic field. FIGS. 2 and 3 are partial enlarged views of the frame collector 1. FIG. The magnetic field line collecting unit 6 is connected to the magnetic field line emitting unit.
The line of magnetic force
The length of the collecting section in the tube axis direction was made variable . Therefore, as shown in FIG. 3, the magnetic field line collecting unit is slidable in the direction A and its length can be changed, so that the amount of collecting the leakage magnetic field can be adjusted. 4 and 5 are diagrams showing the relationship between the top collectors 1 and 1a and the magnetic field generated by the top collector. FIG. 1 shows the frame collectors 1, 1
This is a case where the magnetic field line collecting units 6 and 6a of a have the same length, and the magnetic field 5 has a symmetrical shape. FIG. 4 shows a case where the magnetic field line collecting unit 6 of the right frame collector 1 is extended and the magnetic field line collecting unit 6a of the left frame collector 1a is left as it is, and the magnetic field 8 is shifted to the right. On the other hand, FIG. 5 shows a case where the magnetic field line collecting unit 6a of the left frame collector 1a is extended and the magnetic field line collecting unit 6 of the right frame collector 1 is left as it is. The shape is shifted to the left. By the way, the vertical deflection magnetic field may be asymmetrical due to misalignment of the winding of the vertical deflection coil of the deflection yoke or distortion of the toroidal core. In this case, for example, the forces applied to the electrons of the red beam and the electrons of the blue beam are different from each other. Therefore, in order to equalize these forces, the problem is solved by adjusting the magnetic field generated by the coma collector. can do. That is, when the bright line of the red beam and the bright line of the blue beam are shifted from each other as shown in FIG. 9, the force applied to the red beam and the force applied to the blue beam are respectively shown in FIG.
This is due to the non-uniformity as shown in FIG. In this case, when a magnetic field deviating to the left side shown in FIG. 5 is generated by the coma collector, as shown in FIG. 6, a strong force of 11 is applied to the red beam and a weak force of 10 is applied to the blue beam. As a result, the red beam and the blue beam are equalized as a whole, so that misconvergence can be solved. In the present invention, since the length of the magnetic field line collecting portion of the coma collector can be adjusted, the dipole magnetic field generated in the magnetic field line emitting portion can be adjusted so as not to cause misconvergence. Therefore, it is not necessary to swing the deflection yoke as in the conventional example. According to the present invention, by changing the length of the magnetic field line collecting portion of the top collector in the tube axis direction, the magnetic field generated in the top collector can be made different from side to side, thereby solving the misconvergence. Can be.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the principle of the top collector of the present invention. FIG. 2 is a perspective view of the top collector of the present invention. FIG. 3 is a partially enlarged magnetic field line collecting section of the top collector of the present invention. FIG. 4 is an explanatory diagram of a magnetic field when the length of a magnetic field line collecting unit of the top collector is changed. FIG. 5 is an explanatory diagram of a magnetic field when the length of a magnetic field collecting unit of the top collector is changed. FIG. 7 is an explanatory view of a magnetic field when the length of a magnetic field line collecting unit is changed. FIG. 7 is a diagram showing the principle of a conventional frame collector. FIG. 8 is a perspective view of a conventional frame collector. FIG. 9 is a diagram showing an example of misconvergence. FIG. 10 is a diagram showing the force received by electrons by lines of magnetic force. FIG. 11 is a diagram showing the force received by electrons by lines of magnetic force. FIG. 12 is a diagram showing distortion of an image frame. Description of reference numerals 1, 1a Coma collector 2 Vertical deflection coil 3 Toroidalco 4 vertical deflection magnetic field of the leakage magnetic field 6 field lines DAS 7 field lines emitting portion

Claims (1)

(57) [Claims 1] At a small diameter portion of a deflection yoke used for a cathode ray tube, a magnetic field line collecting section for collecting a leakage magnetic field of a vertical deflection magnetic field formed by a vertical deflection coil, and a magnetic field line collecting section collecting the leakage magnetic field. the frame collector (magnetic) and a magnetic field lines emitting portion forming a 2-pole field provided by the magnetic field, the frame collector
A portion where the magnetic field line collecting section is continuous from the magnetic field line emitting section.
The magnetic field line collecting unit
The length of the tube in the axial direction is variable, and the amount of leakage magnetic field collected is adjusted.
A deflection yoke characterized in that the deflection yoke can be used .