JP2002331550A - Multipolar magnetic field generating device, manufacturing method for its lock ring, and die for manufacturing lock ring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a slip from being generated on the convergence of a color image receiving tube due to the breakage of a lock ring by a stress caused by the clamping of the lock ring, by increasing the strength property of the lock ring. SOLUTION: When the lock ring 117 is to be manufactured by injecting a material into a die, an injection port 124 for the material is located at one of the distal ends of knobs 117a, a plurality of which are provided in a manner to be symmetrical in the lateral direction. In this case, the injected material flows while being divided in two directions as shown by arrows 130a and 130b. Then, a bonded surface 132 which is formed by merging as shown by arrows 131a and 131b is located at a section wherein the other knob 117a exists. Thus, the cross sectional area of the bonded surface 132 increased, and the strength property is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multipole magnetic field generator, a method for manufacturing a lock ring thereof, and a mold for manufacturing a lock ring.

[0002]

2. Description of the Related Art A general color picture tube has a structure as shown in FIG. Panel 1 and funnel 2
Is provided. Inside the panel 1, a phosphor screen 3 including a three-color phosphor layer that emits blue (B), green (G), and red (R) is provided, and is further opposed to the phosphor screen 3. A shadow mask 4 is provided.

On the other hand, inside the neck 5 of the funnel 2,
Electron gun 7 that emits three color electron beams 6B, 6G, 6R
Are arranged. A deflecting device 9 is mounted on the outer periphery near the boundary between the large diameter portion 8 and the neck 5 of the funnel 2. Further, a multi-pole magnetic field generator (hereinafter referred to as PCM) 10 having four-pole and six-pole magnets
Is installed.

Here, the electron gun 7 is an in-line type electron gun which emits three electron beams 6B, 6G, and 6R arranged in a line composed of a center beam and a pair of side beams passing on the same horizontal screen. By combining this electron gun 7 with a deflection device that generates a pincushion-type horizontal deflection magnetic field 12H and a barrel-type changing magnetic field 12V as shown in FIG. 5, the three electron beams 6B, 6G, and 6R arranged in a row are converted. A self-convergence in-line type color picture tube which can be concentrated without adding a presence device or the like is obtained.

FIG. 6 is a perspective view showing a PCM for a color picture tube.
Is shown.

The PCM has six pole magnet rings 14a and 14b, spacer 16b, four pole magnet rings 15a and 15b, between the fixed portion 13a and the lock ring 17a on the outer periphery of the holder 13 for holding.
The spacer 16a is mounted, and these are fastened using the lock ring 17.

Further, a pair of side beams 2
A terrestrial magnetism blocking magnetic member 18 is provided on the side surface corresponding to the color electron beams 6B and 6R. A BPM (Bow Purity Magnet) 11 is attached to the rear side near the boundary between the large diameter portion 8 and the neck 5 of the funnel 2 on which the deflection device 9 is mounted. When the holder 13 is fastened and fixed to the neck 5, a fastening band 19 and a fastening screw 20 are used.

In a general color picture tube, the mounting position and mounting angle of the deflecting device 9, the PCM 10, the BPM 1
By adjusting the magnetic field generated by 1, the purity and convergence are properly adjusted.

[0009]

As described above, in the color picture tube, the mounting position and the mounting angle of the deflecting device 9 mounted on the outside near the boundary between the large diameter portion 8 of the funnel 2 and the neck 5 are determined. The purity and convergence are adjusted by adjusting the magnetic field generated by the PCM 10 mounted on the outer periphery of the neck 5 and the BPM 11 mounted on the rear side of the deflection device 9.

However, in a color picture tube, even if the purity and convergence are properly adjusted under certain geomagnetic conditions, influences other than different geomagnetic conditions and geomagnetic conditions,
For example, due to a chassis, an effect (Chassis Effect), etc., the purity and convergence cannot be properly maintained, and the image quality may be degraded.

In order to prevent such deterioration of image quality, the magnet rings 14a and 14b of the PCM 10 are used.
On the side surface of the holder 13 that holds 15a and 15b, a geomagnetic shielding magnetic member 18 is arranged corresponding to the pair of side beams 6B and 6G.

However, such a magnetic member 1 for blocking geomagnetism
However, even if the electron beam 6B is disposed, the geomagnetism cannot be completely shut off, and the image quality is degraded due to the influence of the geomagnetism until the electron beams 6B, 6G, and 6R reach the deflection device 9. Was.

Degraded purity and convergence are:
Readjustment is possible. However, the lock ring 17 in the conventional PCM has insufficient strength due to the following reasons, which hinders adjustment.

When the lock ring 17 is molded by injecting a material such as a mold resin into a mold, usually, as shown in FIG. Runner 22 into which material flows into inlet 21
Are connected to each other, and an injection port 23 is arranged at a location where an outlet of each runner 22 and a mold for forming the lock ring 17 are connected.

Here, as shown in FIG. 7A, a plurality of knobs 17a are provided on each lock ring 17 symmetrically. However, conventionally, the injection port 23 where the knob 17a does not exist is located on the circumference of the lock ring 17.

When the material flows from the inlet 23, an arrow 3
As shown by reference numerals 0a and 30b, the material is divided into two parts and flows in a ring shape, and a joining surface 32 is formed at a place where the materials indicated by arrows 31a and 31b meet.
As described above, this joint surface 32 is conventionally used for the lock ring 1.
7 was formed at a location where the knob 17a did not exist. Therefore, the joining surface 32 in FIG.
As shown in FIG. 7B, which is a longitudinal sectional view taken along the line BB, the sectional area was small and the strength was insufficient.

When the PCM lock ring 17 is tightened and stress is applied after adjusting the purity and convergence, the tightened portion of the holder 13 is deformed. As a result, the force from the neck 5 is transmitted to the holder 13, and the force (repulsive force) exerts stress on the lock ring 17. As described above, conventionally, since the cross-sectional area of the joint surface 32 of the material in the lock ring 17 is small and the strength is insufficient, the lock ring 17 is
Could be damaged.

As a result, the six-pole magnet ring 14a
And 14b, 4-pole magnet rings 15a and 15b
Cannot be fixed to the holder 13, the magnet rings 14a and 14b, 15a and 15b move so as to rotate, and the image quality is degraded.

The present invention has been made in view of the above circumstances, and enhances the strength of a lock ring. After the lock ring is tightened, stress is applied to the lock ring to damage the lock ring, causing a deviation in the convergence of the color picture tube. It is an object of the present invention to provide a multi-pole magnetic field generation device capable of preventing the occurrence of a high-quality image and obtaining a high-quality image, a method of manufacturing the lock ring thereof, and a lock ring manufacturing die.

[0020]

According to the present invention, there is provided a multi-pole magnetic field generating apparatus, comprising: a cylindrical holder having a lock ring having a plurality of knobs; and a mounting portion between a fixed portion of the cylindrical holder and the lock ring. A plurality of magnet rings, and a spacer mounted between the plurality of magnet rings, wherein the lock ring is such that the material injected into the mold is divided into two rings in the mold in a ring shape. The cross-sectional area of the joining surface is larger than the cross-sectional area of the portion where the knob does not exist, because the joining surface formed at the time of inflow and merging is present at the position where the knob is provided. .

Here, the knob is arranged symmetrically on the outer periphery of the lock ring, and a material is injected from a tip position of a place where the knob is formed in the mold to manufacture the lock ring. May be done.

The method for manufacturing the lock ring of the present invention comprises:
When injecting a material into the lock ring manufacturing mold, the injected material is divided into two directions in the mold in a ring shape and flows into the mold. Is provided at the position where the knob is provided, so that the cross-sectional area of the joining surface is larger than the cross-sectional area at a location where the knob does not exist.

The lock ring is manufactured by arranging the knob so as to be symmetrical about the outer periphery of the lock ring and injecting a material from a tip position of a place where the knob is formed in the mold. You can also.

According to the present invention, there is provided a mold for manufacturing a lock ring having a plurality of knobs, wherein an injection port of a material in the mold is divided into two directions in a ring shape in the mold. And the joining surface formed at the time of merging is present at the position where the knob is provided, so that the sectional area of the joining surface is larger than the sectional area at a location where the knob does not exist. And

Here, the knob may be arranged symmetrically on the outer periphery of the lock ring, and a material injection port may be provided at a tip end of a position where the knob is formed.

[0026]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the configuration of the lock ring of the color picture tube PCM according to the present embodiment. As shown in FIG. 1A, in a lock ring 117 in which a plurality of knobs 123 are symmetrically arranged on the circumference, a material injection port 123 is arranged at the tip of one knob 123. I have. As a result, the material injected from the injection port 123 splits into two hands and flows in a ring shape as shown by arrows 130a and 130b, and the arrows 131a and 131a.
The joining surface 132 formed by joining the materials shown in FIG. 2B is the position where the other knob 123 exists. Therefore, as shown in FIG. 1B, the area of the joint surface 132 is larger than the conventional joint surface 32 shown in FIG. 1B.

As described above, the lock ring 117 according to the present embodiment is configured such that the material is injected from the tip of the formation location of the knob 123 to thereby form the joining surface 1 where the material intersects.
32 increases in cross-sectional area, and the tensile strength is improved. Hereinafter, the area and the tensile strength of the joint surface of the lock ring manufactured according to the present embodiment will be compared with the area and the tensile strength of the joint surface of the conventional lock ring.

[0029] As described above, according to the present embodiment, it has been confirmed that the cross-sectional area of the joint surface of the lock ring increases, and the tensile strength improves accordingly.

Conventionally, as described above, the lock ring 17
When the magnet rings 15a and 15b, 14a and 14b are tightened with the lock ring 17, the lock ring 17 may be damaged. As a result, as shown in FIG. 3A, the magnet rings 15a and 15b or 14a and 14b were not locked and rotated as shown by the arrow. As a result, as shown in FIG. 3B, the displacement of the side beams 6B and 6R was not eliminated, and the image quality was deteriorated.

On the other hand, according to the present embodiment, the lock ring 117 is not damaged even after tightening, and FIG.
As shown in (c), the magnet rings 15a and 15a
5b, 14a and 14b are locked. Therefore, as shown in FIG. 3D, the deviation of the side beams 6B and 6R is eliminated, and the image quality is improved.

FIG. 2 shows a mold according to the present embodiment.
Each runner 122a, 122b, 1 as shown in FIG.
At the tip of the material in the inflow direction at 22c, the pool 1
30a, 130b and 130c are provided. Thus, each time the material flows through each of the runners 122a, 122b, 122c, the pool portions 130a, 130b, 130
Air bubbles, foreign substances, and the like, which remain at the time of the previous molding, and the like, which are melted at a low temperature, accumulate in c and are prevented from flowing from the inlet 123 to the lock ring 117.
Thereby, the defoaming process and the foreign matter removing process can be smoothly performed, and the lock ring 117 can be formed using a material having a high purity and melted at an appropriate temperature.

The above embodiment is merely an example, and does not limit the present invention. For example, in the above embodiment, four knobs are provided on the lock ring, but the number of knobs is not limited to this. Further, in the above embodiment, since the knob is provided symmetrically, when the material is injected from the tip of the knob, the joining surface formed by joining the materials that have been divided into two pieces and flowed in is formed at the location where the knob exists. Located in. However, when the knobs are not provided symmetrically, not only at the tip of the knob, but also as a result of the joining surface formed by the material injected from the injection port splitting and merging into two parts, the knob exists The inlet may be provided so as to be located at the position where the injection is performed.

[0034]

According to the present invention, the joining surface formed by injecting a material, splitting in two directions, flowing in, and merging is located at the position where the knob exists, so that a break in this joining surface is achieved. Since the area is increased and the strength is improved, image deterioration that has conventionally occurred due to breakage of the lock ring can be prevented, and a high-quality image can be realized.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a configuration of a lock ring of a PCM according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing a state in which the lock ring is injected into a mold and a plurality of lock rings are simultaneously molded.

FIG. 3 is an explanatory diagram showing whether or not the multi-pole magnet ring is locked and convergence when the lock is tightened by the lock ring according to the embodiment and the conventional lock ring.

FIG. 4 is a longitudinal sectional view showing a configuration of a color picture tube.

FIG. 5 is an explanatory diagram showing horizontal and vertical deflection magnetic fields generated by a deflection device mounted on a self-convergence in-line type color picture tube.

FIG. 6 is a perspective view showing a lock ring of a PCM to which the present invention can be applied.

FIG. 7 is an explanatory view showing a configuration of a conventional lock ring.

FIG. 8 is an explanatory view showing a state where the lock ring is injected into a mold and a plurality of lock rings are simultaneously molded.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Panel 2 Funnel 3 Phosphor screen 4 Shadow mask 5 Neck 6B, 6C, 6R Electron beam 7 Electron gun 9 Deflection device 10 PCM 11 BPM 13 Holder 14a, 14b 6-pole magnet ring 15a, 15b 4-pole magnet ring 16a, 16b Spacer DESCRIPTION OF SYMBOLS 18 Geomagnetic shielding magnetic member 19 Tightening band 20 Tightening screw 117 Lock ring 117a Knob 121 Inlet 122a, 122b, 122c Runner 123 Inlet 130a, 130b, 130c Reservoir 132 Joint surface

Claims (6)

[Claims] 1. A multi-pole magnetic field generator mounted around an outer periphery of a neck of a color picture tube, a cylindrical holder having a lock ring having a plurality of knobs, and a fixing part of the cylindrical holder. A plurality of magnet rings attached to the lock ring, and a spacer attached to the plurality of magnet rings, wherein the lock ring is configured such that a material injected into a mold passes through the inside of the mold. Since the joining surface formed at the time of the joining is formed at the position where the knob is provided, the cross-sectional area of the joining surface is reduced at a position where the knob does not exist. A multipole magnetic field generator characterized by being larger than the area. 2. The lock ring is manufactured by injecting a material from a tip position of a portion of the mold where the knob is formed, wherein the lock ring is manufactured. The multipole magnetic field generator according to claim 1, wherein 3. A method of manufacturing a lock ring having a plurality of knobs in a multipolar magnetic field generator mounted around an outer periphery of a neck of a color picture tube, wherein a material is injected into a lock ring manufacturing mold. In the meantime, the injected material is divided into two directions in a ring shape in the mold and flows into the mold, and the joining surface formed when merging is present at the position where the knob is provided, A method of manufacturing a lock ring of a multipolar magnetic field generator, wherein a cross-sectional area of the joining surface is larger than a cross-sectional area at a location where the knob does not exist. 4. A method of manufacturing the lock ring by arranging the knob so as to be symmetrical about the outer periphery of the lock ring and injecting a material from a tip end of a location where the knob is formed in the mold. The method for manufacturing a lock ring of a multi-pole magnetic field generator according to claim 3, characterized in that: 5. A mold for manufacturing a lock ring having a plurality of knobs in a multipolar magnetic field generator mounted around an outer periphery of a neck of a color picture tube, wherein a material injection port in the mold is provided. However, the injected material is divided into two directions in a ring shape in the mold and flows into the mold, and the joining surface formed at the time of merging is present at the position where the knob is provided. A mold for manufacturing a lock ring of a multipolar magnetic field generator, wherein a cross-sectional area of a joint surface is larger than a cross-sectional area at a position where the knob does not exist. 6. The lock ring according to claim 5, wherein the knob is arranged symmetrically on the outer periphery of the lock ring, and a material injection port is provided at a tip end of a position where the knob is formed. A mold for manufacturing a lock ring of the multipolar magnetic field generator according to the above.