JP3473468B2 - Deflection yoke - Google Patents

Description

Description: BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a deflection yoke mounted on an in-line type cathode ray tube (CRT).
The present invention relates to a deflection yoke in which a multi-pole magnet ring is mounted on a cylindrical neck portion, and the multi-pole magnet ring is rotated to adjust magnetic field characteristics such as convergence and purity. 2. Description of the Related Art In a deflection yoke used by being mounted on an in-line type CRT, a cylindrical neck provided at an end on a neck (small diameter) side has a plurality of poles such as two poles and four poles. of which is mounted a multipolar magnet rings, and to adjust the magnetic field properties, such as convergence peptidase Nsu and purity by rotating the magnet ring. FIG. 5 is an overall perspective view showing an example of a conventional deflection yoke, and FIG. 6 is an exploded perspective view partially showing an example of a conventional deflection yoke. A conventional deflection yoke will be described with reference to FIGS. In FIG. 5, a deflection yoke formed in a substantially funnel shape by combining a pair of separators 1a and 1b made of insulating resin has a pair of horizontal deflection coils (not shown) inside and a pair of vertical deflection coils outside. A deflection coil 7 is provided, and a pair of cores 2 is provided outside the vertical deflection coil 7. A flange 1f is formed on the small diameter side of the separators 1a and 1b, and a cylindrical neck portion 3 is provided on the flange 1f. The configuration near the neck 3 will be described in more detail with reference to FIG. FIG. 6 shows the separator 1a,
Only the vicinity of the flange 1f in FIG. 1b is shown, and the funnel-shaped part on the tube surface side subsequent thereto is not shown.
In FIG. 6, the cylindrical neck part 3 has tongue pieces 3a to 3f.
The neck portion 3 stands upright on the flanges 1f of the separators 1a and 1b by integral molding. [0006] The neck portion 3 has flexibility.
Since the slits 4a to 4f are formed in the neck portion 3, the neck portion 3 is bent inward. A fastening band 5 for fixing the deflection yoke to the neck of the CRT is attached to the neck portion 3. A bolt 6 is screwed into the tightening band 5. By tightening the bolt 6, the inner diameter of the tightening band 5 can be reduced and the neck 3 can be narrowed, so that the deflection yoke is fixed to the neck of the CRT. Can be. [0007] Tightening band 5 and separators 1a, 1b
The magnet rings 10, 11 having a plurality of magnetic poles are mounted between the flanges 1f. FIG.
Are the tightening band 5 and the magnet rings 10 and 11
Is removed from the neck 3. The magnet rings 10 and 11 are generally formed from a material in which magnetic powder such as barium ferrite or alnico is uniformly dispersed in a nylon resin. [0008] More specifically, the magnet ring 1
0 and 11 are held in the neck part 3 as follows.
At the lower end of the neck portion 3, there are formed protrusions 12a and 12b having elasticity to bend in the direction of the tube axis (Z axis) of the CRT. The tongue pieces 3c and 3f of the neck part 3 are formed with a flexible tongue piece 13 that bends inward of the neck part 3, and the upper end of the tongue piece 13 has a substantially triangular shape. Nail 13a
Are formed. And the magnet rings 10, 1
1 is inserted into the neck portion 3 from the small diameter side of the deflection yoke, and is held so as to be sandwiched between the protrusions 12a and 12b and the claw 13a. A projection 14 is formed at the upper end of the tongue pieces 3c, 3f for engaging with the holes 5a, 5b of the tightening band 5. The projections 14 are inclined obliquely downward, and the tongues 13 are bent inwardly of the neck portion 3 as described above.
1 can be easily attached to a predetermined position of the neck portion 3. Since the distance between the protrusions 12a and 12b and the claw 13a is slightly smaller than the total thickness of the magnet rings 10 and 11, the magnet rings 10 and 1
When 1 is mounted between the protrusions 12a, 12b and the claw 13a, the protrusions 12a, 12b are elastically deformed, and the repulsive force is applied to the magnet rings 10, 11. When adjusting the magnetic field characteristics by attaching the deflection yoke to the CRT, the magnet rings 10 and 11 are rotated. At this time, the force required to rotate the magnet rings 10 and 11 is neither too strong nor too weak, so that an optimal state is obtained. 11 and the magnet rings 10 and 11
So that the magnet rings 10 and 1 do not rotate.
At the time of rotation of 1, the proper rotation torque is applied by the protrusions 12a and 12b and the claw 13a. This rotational torque is obtained by a frictional force generated by a repulsive force of the protruding portions 12a and 12b in the Z-axis direction (upward in FIG. 6). [0011] The conventional deflection yoke described above has the following problems.
The position where the repulsive force of the protrusions 12a and 12b is applied to the magnet ring 11 is shifted from the position where the claw 13a is in contact with the magnet ring 10. That is, the portion that applies force to the magnet rings 10 and 11 from the flange 1f side does not face the portion that applies force from the distal end side of the neck portion 3. Magnet rings 10, 11
Is relatively easily warped due to molding variations. Therefore, depending on the degree of warping and the form of warping of the magnet rings 10, 11, the protrusions 12a, 12b
The amount of deflection in the Z-axis direction varies, and as a result, the rotational torque when rotating the magnet rings 10 and 11 becomes
There is a large problem that the individual magnet rings 10 and 11 vary. In addition, magnet ring 1
Magnet ring 1 corresponding to the form of warp of 0, 11
There is also a problem that the rotation torque fluctuates with the rotation of 0 and 11. Further, since the pressing positions of the protrusions 12a and 12b against the magnet rings 10 and 11 and the contact positions of the claws 13a do not face each other, the magnet rings 10, 11
Rings 11 and 11 by the repulsive force added to
Is deformed. In the initial stage of the assembly of the deflection yoke, even if an appropriate rotational torque including the repulsive force of this deformation is obtained, stress relaxation occurs in which the repulsive force decreases with time, and the rotational torque fluctuates with time. There were also problems. The fact that the rotational torque fluctuates over time means that even when the deflection yoke is assembled at an appropriate torque, the deflection yoke will have an inappropriate rotation torque when adjusted at the delivery destination, making adjustment work difficult. Will result in a malfunction. The degree of deformation of the magnet rings 10 and 11 depends on the material thereof, that is, the magnet rings 10 and 1.
1 depends on whether it is made of barium ferrite or alnico. Therefore, the magnet rings 10, 11
Even if the repulsive force applied to the magnet rings 10 and 11 is the same, the degree of deformation is different if the materials of the magnet rings 10 and 11 are different. It is necessary to make the distance between the nails 12a, 12b and the claws 13a different. Therefore, there is no compatibility of the separators 1a and 1b with the material of the magnet rings 10 and 11, resulting in an increase in cost. The present invention has been made in view of such a problem, and a deflection yoke in which a multi-pole magnet ring is mounted on a neck portion and the magnetic field characteristics are adjusted by rotating the multi-pole magnet ring. It is an object of the present invention to provide a deflection yoke capable of stabilizing a rotation torque when rotating a magnet ring and efficiently adjusting a magnetic field characteristic. SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides a cylindrical neck formed on a flange at a small diameter side end of a funnel-shaped separator, A magnet ring rotatably held by a portion, and at least a pair of pressing pieces for holding the magnet ring by a pressing portion, and connecting one end of at least one of the pressing pieces of the pair of pressing pieces to the flange. I
And the pressing portion is attached to the one holding piece.
In the deflection yoke obtained by forming a bending portion bent in a direction along the a tube axis, the pressing portion with respect to the magnet ring by the pair of pressing pieces, the magnet Li
And the bending portion is oriented so as not to penetrate the neck portion, and
The present invention provides a deflection yoke which is formed so as not to penetrate the neck toward one end . Hereinafter, a deflection yoke according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is an overall perspective view showing one embodiment of a deflection yoke of the present invention, FIG. 2 is a partial perspective view showing a main part of one embodiment of the deflection yoke of the present invention, and FIGS. 3 and 4 are deflection yokes of the present invention. FIG. 2 is a partial side view showing a main part of one embodiment. In FIGS. 1 to 4, FIGS.
The same reference numerals are given to the same parts as those described above, and the description thereof may be omitted. In FIG. 1, a deflection yoke formed substantially in a funnel shape by combining a pair of separators 1a and 1b made of insulating resin has a pair of horizontal deflection coils (not shown) inside and a pair of vertical deflection coils outside. A deflection coil 7 is provided, and a pair of cores 2 is provided outside the vertical deflection coil 7. A flange 1f is formed on the small diameter side (upper side in FIG. 1) of the separators 1a and 1b.
A cylindrical neck portion 3 is provided on the flange 1f. The structure near the neck 3 will be described in more detail with reference to FIG. FIG. 2 shows the separator 1a,
Only the vicinity of the flange 1f in FIG. 1b is shown, and the funnel-shaped part on the tube surface side that follows is partially omitted. In FIG. 2, the cylindrical neck 3 is
The neck portion 3 stands upright on the flange 1f of the separators 1a and 1b by integral molding. The neck 3 has flexibility, and
Since the slits 4a to 4f are formed in the neck portion 3, the neck portion 3 is bent inward. A fastening band 5 (see FIG. 1) for fixing the deflection yoke to the neck of the CRT is attached to the neck portion 3. A bolt 6 (see FIG. 1) is screwed into the tightening band 5, and the inner diameter of the tightening band 5 can be reduced by tightening the bolt 6, so that the neck portion 3 can be narrowed.
The deflection yoke can be fixed to the neck of the CRT. Tightening band 5 and separators 1a, 1b
The magnet rings 10 and 11 (see FIG. 1) having a plurality of magnetic poles are mounted between the flanges 1f.
FIG. 2 shows a state in which the fastening band 5 and the magnet rings 10 and 11 are not mounted on the neck portion 3. The magnet rings 10 and 11 are generally formed from a material in which magnetic powder such as barium ferrite or alnico is uniformly dispersed in a nylon resin. More specifically, the magnet ring 1
0 and 11 are held in the neck part 3 as follows.
FIG. 3 also shows the tightening band 5 and the magnet ring 10,
11 shows a state where it is not attached to the neck part 3.
As shown in FIGS. 2 and 3, the flange 1 f extends from the flange 1 f in a direction substantially parallel to the Z axis in a direction toward the tip of the neck portion 3.
By bending in a direction substantially parallel to the surface of the flange 1f, substantially L-shaped arms 22a and 22b are formed. Protrusions 22a1 and 22b1 protruding in the direction of the tip of the neck 3 are formed at the tips of the arms 22a and 22b. In addition, the tongue 3c, 3 d near the neck portion 3, the tongue piece 23a, 23 having flexibility flexes inward of the neck portion 3
b are formed, and substantially triangular claws 23a1 and 23b1 are formed at the upper ends of the tongue pieces 23a and 23b. Then, as shown in FIG. 4, the magnet rings 10 and 11 are inserted into the neck portion 3 from the small diameter side of the deflection yoke so as to be sandwiched between the arm portions 22a and 22b and the tongue pieces 23a and 23b. Will be retained. Arms 22a, 2
2b and the tongue pieces 23a, 23b
It is a holding piece for holding 0,11. This holding piece is also provided on the opposite side of the neck part 3,
A pair is provided at a position approximately 180 ° apart from three peripheral portions of the neck portion. The protrusions 22a1 of the arms 22a, 22b,
22b1 and the claws 23a1 and 23b1 of the tongue pieces 23a and 23b
The pressing portion presses the magnet rings 10 and 11. Projections 22a1, 22b1 of arms 22a, 22b
The size between the claws 23a1 and 23b1 of the tongue pieces 23a and 23b is slightly smaller than the total thickness of the magnet rings 10 and 11 so that the magnet rings 10 and 11
Are the projections 22a1 and 22b1 of the arms 22a and 22b and the tongue piece 23
a, 23b, between the claws 23a1, 23b1,
As shown in FIG. 4, mainly the portions of the arms 22a and 22b parallel to the flange 1f bend in the Z-axis direction, and the repulsive force is applied to the magnet rings 10 and 11. In the present invention, the magnet ring 1
Arms 22a and 22b as holding pieces for holding 0 and 11
And the tongue pieces 23a, 23b are connected to the magnet rings 10, 1
The projections 2 are generally opposed to each other with respect to 1 and are pressing portions thereof.
2a1, 22b1 and claws 23a1, 23b1 are generally opposed to each other with the magnet rings 10, 11 interposed therebetween. Therefore, even if the magnet rings 10 and 11 are deformed and warped, the protrusions 22a1 and 22b1 of the arms 22a and 22b and the tongue 2
Since the thickness of the magnet rings 10, 11 between the claws 23a1, 23b1 of the 3a, 23b does not change, the arm 2
The degree of bending of the portions of 2a and 22b parallel to the flange 1f is constant. Therefore, the magnet rings 10 and 11
Is constant and stable, and as a result, there is no variation in the rotational torque when the rotation of the magnet rings 10 and 11 is adjusted. Further, since the pressing portions of the magnet rings 10, 11 are opposed to each other, the magnet rings 10, 11
Rings 11 and 11 by the repulsive force added to
Is not deformed. Therefore, the rotational torque does not fluctuate over time. Also, the magnet rings 10, 1
1 are different from each other in the shape of the separators 1a and 1b (the protrusions 22a1 and 22b1 of the arms 22a and 22b and the tongue pieces 23).
a and 23b may be the same as the distance between the claws 23a1 and 23b1. Therefore, the separators 1a and 1b can be made compatible with the material of the magnet rings 10 and 11, and the cost can be reduced. In this embodiment, as a preferred embodiment,
It is configured as follows. The bending portion in the Z-axis direction, which is a parallel portion of the arms 22a and 22b with the flange 1f, is formed so as not to penetrate the neck portion 3. The bending portions in the Z-axis direction of the arms 22a and 22b can be formed on the neck 3 and the flange 1f so as to extend outward from the neck 3. However, in this case, since various components are mounted on the flange 1f, the bending portion is shortened, and a sufficient amount of deformation of the arms 22a and 22b may not be obtained. Therefore, it is preferable that the bending portions in the Z-axis direction of the arms 22 a and 22 b are formed in a direction that does not penetrate the neck 3. Further, in this embodiment, the arms 22a, 22
b and the tongue pieces 23a and 23b are formed at the ends of the separators 1a and 1b on the side of the butted portion 1g. By doing so, the separators 1a and 1b can be easily formed, the mold is not complicated, and the separators 1a and 1b can be manufactured at low cost. The present invention is not limited to the embodiment described above. In the present embodiment, two pairs of pressing pieces (pressing portions) of the magnet rings 10 and 11 are provided at one portion of the neck portion 3; Also, the arms 22a, 22
b projections 22a1, 22b1 and tongue pieces 23a, 23b claws 23
The number of magnet rings sandwiched between a1 and 23b1 is not limited to two, and may be one or three or more. As described in detail above, the deflection yoke according to the present invention is provided with a flange at the small diameter side end of the funnel-shaped separator.
And a magnet ring rotatably held on the neck portion, and at least one pair of pressing pieces for holding the magnet ring between the pressing portions, and at least one of the pair of pressing pieces. Holding piece
Is formed by connecting one end to the flange.
In a deflection yoke having a pressing portion on one of the pressing pieces and a bending portion formed to bend in a direction along the tube axis , a pressing portion of the pair of pressing pieces against the magnet ring is generally opposed to each other across the magnet ring. Let it be formed,
The bending part is oriented so as not to penetrate the neck part, and
As it is formed so that it does not penetrate the neck toward one end , the flexure is not shortened and the amount of deformation of the arm does not become necessary and sufficient, and the rotational torque when rotating the magnet ring is stable And the magnetic field characteristics can be adjusted efficiently.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an overall perspective view showing one embodiment of the present invention. FIG. 2 is a partial perspective view showing a main part of one embodiment of the present invention. FIG. 3 is a partial side view showing a main part of one embodiment of the present invention. FIG. 4 is a partial side view showing a main part of one embodiment of the present invention. FIG. 5 is an overall perspective view showing a conventional example. FIG. 6 is a partial perspective view showing a conventional example. [Description of Signs] 1a, 1b Separator 1f Flange 2 Core 3 Neck 7 Vertical deflection coil 10, 11 Magnet ring 22a, 22b Arm (holding piece) 22a1, 22b1 Projection (pressing piece) 23a, 23b Tongue piece (holding piece) ) 23a1, 23b1 Claw (pressing part)

Continued on the front page (72) Inventor Kazuo Kayama 3-12-3 Moriyacho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Within Victor Company of Japan, Inc. 56) References JP-A-9-245677 (JP, A) JP-A-51-8662 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 29/54

Claims (1)

(57) Claims: (1) A cylindrical neck formed on a flange at a small-diameter end of a funnel-shaped separator; a magnet ring rotatably held on the neck; and the magnet ring. And at least one pair of pressing pieces that sandwich the pressing section, and at least one pressing piece of the pair of pressing pieces is formed by connecting one end of the pressing piece to the flange, and the one pressing piece is In a deflection yoke having a pressing portion and forming a bending portion that bends in a direction along the tube axis, the pressing portion against the magnet ring by the pair of holding pieces is generally opposed to each other with the magnet ring interposed therebetween. A direction in which the bending portion is directed from the one end to the pressing portion.
And the direction from the pressing portion toward the one end portion.
The deflection yoke is formed so as not to penetrate the neck portion .