JPH11265668A - Cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube capable of providing a high deflection efficiency and reducing the manufacturing cost of a deflection yoke. SOLUTION: A deflection yoke DY is formed of a cone part C, horizontal coils 11A, 11B provided on the circumference thereof, vertical coils 12A, 12B on the circumference thereof, and a core 13 provided thereon. The horizontal coils 11A, 11B are formed so as to have a circular section on a neck part N side and a rectangular section on a funnel part F side as the whole. The vertical coils 12A, 12B are formed so as to have a circular section on the neck part N side and a rectangular section on the funnel part F side as the whole. The core 13 has a tapered cylindrical form increased from the neck part N side toward the funnel part F side. On the funnel part F side, auxiliary cores 21A, 21B are interposed in a vertical large space between the outside surface of the vertical coil 12 and the inside surface of the core 13, and auxiliary cores 22A, 22B are interposed in right and left small spaces.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube, and more particularly to a cathode ray tube for reducing deflection power by shaping a cone portion of a tube body to which a deflection yoke is attached into a rectangular or elliptical cross section.

[0002]

2. Description of the Related Art As shown in FIG. 8, a cathode ray tube (CRT) includes a tube body T in which a funnel portion F and a neck portion N are continuous with a cone portion C, and a fluorescent layer, a shadow mask and the like are provided in the funnel portion F. The face panel P has an electron gun E at a neck N, and a deflection yoke DY at a cone C.
As is well known, the deflection yoke DY generates a magnetic field in which a horizontal coil and a vertical coil give a deflection angle to an electron beam.
The deflection efficiency is greatly affected by the sectional shape of the cone portion C.

Therefore, in recent years, as shown in FIGS. 9a and 9b, a CRT in which a cone portion C of a tube body T is formed into a rectangular or elliptical cross section has been put to practical use. This CR
At T, the deflection yoke DY also has a horizontal coil 111, a vertical coil 112 and a core 11 having a cross-sectional shape similar to that of the cone portion C.
3 That is, as shown in FIGS.
A horizontal coil 111 having a rectangular cross section is provided on the outer circumference of the cone portion C having a rectangular cross section.
A vertical coil 112 whose inner and outer peripheral surfaces are both rectangular in cross section is provided on the outer periphery of a separator 114 with a separator 114 therebetween.
Is provided. Reference numeral 115 denotes a tightening band.

[0004]

However, in the above-described deflection yoke DY, the core 113 also has the cone portion C.
Therefore, there is a problem that the manufacturing cost of the core 113 is large and it is difficult to obtain a specified dimensional accuracy of the core. That is, since the core 113 is manufactured by molding or baking using a material containing a magnetic material, heat shrinkage is inevitable during baking, and distortion is caused by heat shrinkage in a cross-sectional shape other than a circle (irregular cross-sectional shape). And it is difficult to obtain a specified dimensional accuracy, and high productivity cannot be obtained, resulting in an increase in manufacturing cost. The present invention has been made in view of the above circumstances, and provides a cathode ray tube capable of achieving the same deflection efficiency as that using a core having a similar shape without using a core having a similar shape to a cone portion and saving power. With the goal.

[0005]

In order to achieve the above object, the present invention comprises a tube body having a funnel portion and a neck portion continuous with a cone portion, a deflection yoke provided on an outer periphery of the cone portion, and The yoke is a cathode ray tube composed of a horizontal coil located on the outer periphery of the cone portion, a vertical coil located on the outer periphery of the horizontal coil, and a core located on the outer periphery of the vertical coil. The cross section of the horizontal coil and the vertical coil is formed in a shape similar to the cone portion, the cross section of the core is formed in a circular shape, and between the inner periphery of the core and the outer periphery of the vertical coil. An auxiliary core is interposed symmetrically with respect to the center of the cone portion in the generated gap.

In the cathode ray tube according to the present invention, since a core having a circular cross section is used, a gap is formed between the core and the vertical coil, and an auxiliary core is symmetrically interposed in the gap. Therefore, it is possible to form a magnetic circuit equivalent to a horizontal coil, a vertical coil and a core having a cross section similar to that of the cone portion, to obtain high deflection efficiency, to save power, and to make the core easy and inexpensive. Manufacturing cost can be reduced.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show the first embodiment of the present invention.
FIG. 1 is a longitudinal sectional view of a cone portion of a tube body provided with a deflection yoke DY, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. FIG. 4 is a side view of the core, showing details of mounting the auxiliary core.

In the figure, C denotes a cone of the tube body T, DY denotes a deflection yoke provided on the outer circumference of the cone C, and the deflection yoke DY is a pair of horizontal coils 11A provided on the outer circumference of the cone C. , 11B, a pair of vertical coils 12A, 12B provided on the outer circumference of the horizontal coils 11A, 11B with a separator 14 therebetween, and a core 13 provided on the outer circumference of the vertical coils 12A, 12B.

The horizontal coils 11A and 11B are arranged so as to face each other in the vertical (up and down) direction, and have an overall shape having a circular cross section on the neck portion N side and a rectangular cross section on the funnel portion F side. The vertical coils 12A and 12B are arranged to face each other in the horizontal (left / right) direction, and have an overall shape having a circular cross section on the neck N side and a rectangular cross section on the funnel F side. These horizontal coil 11 and vertical coil 12
Is manufactured by molding called mold winding, or by winding a separator 14 or the like called section winding as a bobbin.

The core 13 has a tapered cylindrical shape whose inner and outer diameters increase from the neck portion N toward the funnel portion F, and the inner diameter of the neck portion N is equal to the outer diameter of the vertical coil 12 and the funnel portion. The inner diameter dimension on the F side substantially matches the dimension of the corner of the vertical coil 12. As the core 13, a well-known sintered ferrite or a so-called plastic core obtained by molding magnetic powder such as ferrite using a resin as a binder is used.

Due to such a difference in cross-sectional shape between the vertical coil 12 and the core 13, as shown in FIG.
A large gap is formed between the outer peripheral surface of the core 2 and the inner peripheral surface of the core 13 on the funnel portion F side, and a small gap is formed on the left and right sides. Then, auxiliary cores 21A and 21B each having a crescent cross section are provided in the upper and lower large gaps, and auxiliary cores 22A and 22B each having a rectangular cross section are provided in the left and right small gaps. These auxiliary cores 21 and
Reference numeral 2 denotes a sintered ferrite or plastic core similarly to the core 13 described above, and preferably has a magnetic permeability μ of 5 or more, and is bonded to the inner peripheral surface of the core 13 with an adhesive as shown in FIG. Fixed.

In this embodiment, the horizontal coil 1
1 and the funnel portion F side of the vertical coil 12 are each formed into a rectangular cross section similar to the funnel portion F, and a core 13 having a circular cross section is used. An auxiliary core is provided in a gap formed between the vertical coil 12 and the core 13. 21 and 22 are interposed to close these gaps. Therefore, the magnetic resistance can be reduced, high deflection efficiency can be obtained, and high dimensional accuracy can be obtained for the core 13 and the like, so that the manufacturing cost can be reduced.

That is, the auxiliary cores 21 and 22, which are magnetic materials,
2, a high deflection efficiency is obtained because a magnetic circuit is formed, and a core 13 is used because a cylindrical core 13 is used.
Can be manufactured inexpensively with high dimensional accuracy. Specifically, in comparison with a CRT in which the cone portion C, the horizontal coil 11 and the vertical coil 12 are all circular in cross section, this embodiment shows that when the diameter and the deflection angle of the cone portion C are the same, It was demonstrated that the sensitivity was improved by about 10% to 30%.

FIG. 5 shows a cathode ray tube according to a second embodiment of the present invention, in which a is a longitudinal sectional view of a core, b is a side view of the core, and c shows a state in which a vertical coil is attached to the core. It is a longitudinal cross-sectional view. Note that, in this embodiment and the embodiment described later, the same portions as those in the above-described first embodiment are denoted by the same reference numerals, and description and illustration are omitted.

The second embodiment uses a vertical coil 12
The core 13 faces the inner peripheral surface of the vertical coil 12 on the side of the funnel portion F. That is, a plurality of slots (grooves) 13a are formed on the inner peripheral surface of the core 13 on the neck N side,
In addition, the portion of the vertical coil 12 on the funnel portion F side is wound around a rectangular bobbin molded of resin and passed through the slot 13a, thereby achieving a section winding structure as a whole on the vertical coil 12. According to the second embodiment, higher deflection sensitivity can be obtained as compared with the first embodiment.

FIG. 6 is a cross-sectional view showing a cathode ray tube according to a third embodiment of the present invention and showing details of mounting an auxiliary core. In the third embodiment, the separator 15 having the holding claws 15a is provided on the outer periphery of the vertical coil 12,
Holding the auxiliary cores 21 and 22 on the outer surface of the separator 15
5a. When the vertical coil 12 is wound around a bobbin, a holding claw is formed on the bobbin,
It is also possible to hold the auxiliary cores 21 and 22 on the holding claws of the bobbin.

FIG. 7 shows a cathode ray tube according to a fourth embodiment of the present invention.
b is sectional drawing of CC of arrow a. In the fourth embodiment, the vertical coil 12 is formed by winding a mold, and a claw 19a of a rib 19 at a joint between the vertical coils 12A and 12B is formed.
The auxiliary cores 21 and 22 are fixedly attached to each other or provided with an adhesive.

In each of the above embodiments,
Although the cone part C is exemplified as having a rectangular cross section, it is needless to say that the same configuration can be adopted even if the cone part C has an elliptical cross section. In the above-described embodiment, four auxiliary coils 21A, 21B, 22A, and 22B are provided. However, when the horizontal gap is small, the present invention can be achieved by providing two auxiliary cores.

[0019]

As described above, according to the cathode ray tube of the present invention, the cone portion of the tube body is formed to have a rectangular or elliptical cross section, and the horizontal and vertical coils of the deflection yoke are similar to the cone portion. The core was formed in a circular cross section in the cross section described above, and an auxiliary core was interposed in a gap formed between the core and the vertical coil. Therefore, the core can be easily and inexpensively manufactured, and the same deflection efficiency as when the core has a rectangular or elliptical shape similar to the cone portion can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a deflection yoke mounting portion of a cathode ray tube according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is a side sectional view showing details of attachment of an auxiliary core of the deflection yoke.

5A and 5B show a deflection yoke mounting portion of a cathode ray tube according to a second embodiment of the present invention, wherein a is a longitudinal sectional view of a core, b
Is a side view of the core, and c is a longitudinal sectional view showing a state where a vertical coil is attached to the core.

FIG. 6 is a cross-sectional view showing a cathode ray tube according to a third embodiment of the present invention and showing details of mounting an auxiliary core.

FIG. 7 shows a cathode ray tube according to a fourth embodiment of the present invention, wherein a is a longitudinal sectional view of a mounting portion of an auxiliary core, and b is a C of a.
It is sectional drawing in the -C arrow direction.

FIG. 8 is a schematic sectional view of a cathode ray tube.

9A and 9B show a conventional attachment structure of a deflection yoke, wherein a is a longitudinal sectional view of the attachment structure, and b is a sectional view taken along line DD of a.

[Explanation of symbols]

11 (A, B) ... horizontal coil, 12 (A, B) ... vertical coil, 13 ... core, 13a ... slot, 14 ...
... Separator, 15 ... Separator, 15a ... Retaining claw, 19 ... Rib, 21 (A, B) ... Auxiliary rib, 22
(A, B): auxiliary rib, C: cone part, DY: deflection yoke, F: funnel part, T: pipe body.

Claims (6)

[Claims] 1. A tube body having a funnel portion and a neck portion continuous with a cone portion, a deflection yoke provided on an outer periphery of the cone portion, wherein the deflection yoke comprises: a horizontal coil located on the outer periphery of the cone portion; In a cathode ray tube composed of a vertical coil located on the outer periphery of the coil and a core located on the outer periphery of the vertical coil, the cone portion is formed into a rectangular or elliptical cross section, and the cross sections of the horizontal coil and the vertical coil are respectively formed. The auxiliary core is formed symmetrically with respect to the center of the cone in a gap formed between the inner circumference of the core and the outer circumference of the vertical coil. A cathode ray tube, which is interposed. 2. The cone section, the horizontal coil and the vertical coil are rectangular in cross section, and two large gaps and two small gaps are provided between the core and the vertical coil at 180 degrees in the circumferential direction. The cathode ray tube according to claim 1, wherein a large auxiliary core having a substantially crescent shape in cross section is formed in the large gap, and an auxiliary core having a substantially rectangular cross section is interposed in the small gap. 3. The cathode ray tube according to claim 1, wherein the auxiliary core is fixed to an inner peripheral surface of the core with an adhesive. 4. A plurality of slots are formed in the inner peripheral surface on the neck side of the core at intervals in a circumferential direction, and a portion of the vertical coil corresponding to the slot is passed through the slot. 2. The cathode ray tube according to claim 1, wherein the first surface faces the inner peripheral surface of the vertical coil. 5. The cathode ray tube according to claim 1, wherein holding claws project from an outer periphery of the vertical coil, and the auxiliary core is fixed to the holding claws. 6. The cathode ray tube according to claim 1, wherein the auxiliary core is formed of a resin containing a magnetic powder.