JP2002150972A - Static convergence device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a static convergence device that enables convergence adjustment, without having to transmit unnecessary rotationd force to a pair of magnets, other than the adjusting magnets by preventing rotation of the spacer together with the convergence magnets, when the user makes convergence adjustment by rotating the pair of magnets, in a manufactured color cathode-ray tube device having the static convergence device. SOLUTION: A groove 27, which has a cross section of trapezoidal shape extending in the tube axis direction, is provided at the cylindrical holder 23 that holds a pair of ring shape magnets 31, 32 and a spacer 34. A locking piece 33, which is provided in the spacer 34 and formed larger than the inner diameter of the groove 27, is pressed in the groove 27, and the spacer 34 is structured on the outer circumference of the holder 23, so as to fix and hold it and separates the pair of convergence magnets 31, 32.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a static convergence device which is used for a color terminal display, a color television receiver and the like and is composed of a combination of a plurality of ring magnet pairs.

[0002]

2. Description of the Related Art At present, a color cathode ray tube generally used for a color terminal display, a color television receiver and the like includes a face panel 61 having a substantially rectangular screen as shown in FIG. An envelope having a funnel 62 integrally joined to the face panel 61 is provided. On the inner surface of the face panel 61, red, blue,
Phosphor screen 6 having a three-color phosphor layer that emits green light
3 are formed.

[0003] Further, in the envelope, a shadow mask 65 for performing color selection by passing an electron beam 64 is disposed opposite to the phosphor screen 63, and the shadow mask 65 is mounted on a mask frame 66. While being fixed,
The mask frame 66 is attached to the inner surface of the face panel 61.

Further, a center beam 64G and a pair of side beams 64 are provided in a neck 67 of the funnel 62.
An in-line type electron gun 68 arranged horizontally in a line for emitting an electron beam 64 composed of R and 64B is provided, and the electron beam 6 emitted from the electron gun 68 is provided.
4 is a deflection yoke 69 mounted outside the funnel 62
A color image is reproduced and displayed on the phosphor screen 63 by scanning the phosphor screen 63 in the horizontal and vertical directions with the electron beam 64 by being deflected by the magnetic field generated.

[0005] A pair of annular purity magnets 70 magnetized into two poles of NS are rotatably mounted on the end surface of the deflection yoke 69 on the neck 67 side.

The phosphor screen 63 is formed in a black matrix type or a black stripe type in which a three-color phosphor layer is embedded in a gap between light-absorbing layers in a matrix or a stripe using a photographic printing method. A phosphor screen 63 is used.

As described above, when the three-electron beam 64 in-line type electron gun 64 that emits the center beam 64G and the pair of side beams 64R and 64B passing on the same horizontal plane is employed, the deflection yoke 69 is used. By setting the horizontal deflection magnetic field to be a pin cushion type as shown in FIG. 9 and the vertical deflection magnetic field to be a barrel type as shown in FIG. 9, without using a dynamic convergence circuit,
A self-convergence method using a static convergence device 71 having a simple configuration is widely and generally used.

The static convergence device 71
As shown in FIG. 10, the neck 67 of the color cathode ray tube is
It has a cylindrical holder 72 made of a synthetic resin such as polypropylene to be mounted, and a plurality of tongue pieces 74 is provided by providing a plurality of slits 73 from one end of the holder 72 to an intermediate portion in the axial direction.

A flange 75 having a diameter larger than that of the holder 72 is provided at the intermediate portion. An outer surface of the holder 72 between the flange 75 and the other end of the holder 72 is provided in the axial direction. A plurality of, for example, a pair of opposed groove portions 76 are formed.

On the outer peripheral surface of the end of the holder 72 in which the groove 76 is formed, a screw portion 77 is formed, and the outer peripheral surface of the tongue piece 74 of the end of the holder 72 in which the slit 73 on the other side is formed. A fastening band 78 for fixing the holder 72 on the outer peripheral surface of the cathode ray tube neck 67 is provided above.
Are arranged, and the tightening band 78 is tightened and fixed by a screw 79.

Further, a plurality of annular convergence magnet pairs 80 and 8 magnetized to form a pair of six poles and four poles, respectively, are formed on the outer periphery of the holder 72 in which the groove 76 is formed.
1 is rotatably mounted, and the magnet pair 80, 81
A spacer 83 in which a locking piece 82 that fits into the groove 76 is disposed facing the inside in the space between the holder 72 and the end of the holder 72.

A lock ring 84 mounted on the holder 72 is screwed into a screw 77 provided at an end of the holder 72. Further, side beams 64R and 64 are provided.
A magnetic body 85 for shielding the terrestrial magnetism is mounted in the axial direction of the inside of the holder 72 corresponding to B, and a static convergence device 71 mainly used for a terminal display.
Is configured.

With this configuration, the deflection yoke 69 is mounted on the color cathode ray tube while adjusting the mounting position and angle, and the purity magnet 70 and the static convergence device 71 are adjusted so that the purity and convergence are optimized. Is adjusted and shipped as a color cathode ray tube device.

However, a color cathode ray tube apparatus is a monitor which uses different color magnetism or a different cathode ray tube apparatus even if the purity and convergence are adjusted to an optimum state under specific geomagnetic conditions. Under the product manufacturer's set design and assembly conditions, it does not always match the conditions at the time of manufacturing the color cathode ray tube device,
For this reason, the state of purity or convergence may not be optimal, and there is a problem that image quality is degraded.

[0015]

As a countermeasure for preventing the image quality from deteriorating due to terrestrial magnetism, a magnetic body 85 for shielding terrestrial magnetism is arranged inside the holder 72 of the static convergence device 71 to prevent terrestrial magnetism. Although the influence is reduced, the influence of terrestrial magnetism cannot be completely eliminated, and deterioration of image quality cannot be avoided.

The deteriorated purity or convergence can be readjusted by rotating and adjusting the magnet pairs 80 and 81 of the purity magnet 70 and the static convergence device 71.

For example, when readjusting the convergence, the lock ring 84 is rotated in a loosening direction so that the respective convergence magnet pairs 80 and 81 can be freely rotated. The rotation of each of the magnets 80a, 80b, 81a, 81b is adjusted and readjusted to an optimal position. After the readjustment is completed, the lock ring 84 is tightened again to fix the convergence magnet pairs 80 and 81 at predetermined positions, thereby completing the readjustment.

However, when the re-adjustment work is completed, when the lock ring 84 is tightened to fix the convergence magnet pairs 80 and 81, the holder 72
The spacer 83, which is engaged and held by the engagement between the groove 76 and the locking piece 82, rotates by the gap between the groove 76 and the locking piece 82 due to the tightening force of the lock ring 84. The convergence magnet pair 80, 81 pressed against the spacer 83, particularly the convergence magnet 81b, rotates in the direction of the arrow as shown in FIG. 11A, and as a result, as shown in FIG. The situation where it slipped occurred.

In order to avoid this, it is only necessary to employ a configuration in which rattling of the spacer 83 is eliminated. However, the current combination results in problems such as poor workability during assembly and mounting.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to obtain a stable image without deteriorating the workability at the time of assembling and mounting, and without causing the deterioration of convergence even after readjustment. It is an object of the present invention to provide a static convergence device capable of obtaining quality.

[0021]

According to the present invention, there is provided a cylindrical holder made of a synthetic resin fixed on an outer peripheral surface of a neck of a color cathode ray tube, and a groove formed on the outer peripheral surface of the holder and extending in the axial direction of the tube. And a plurality of annular magnet pairs rotatably fitted on the outer peripheral surface of the holder, an annular separator having a locking piece interposed between the respective magnet pairs and press-fitted into the groove, and these separators and The static convergence device was constituted by fixing means for fixing the magnet pair on the holder.

With this configuration, the locking piece of the spacer can be securely housed in the groove by press-fitting, and the rotation of the spacer can be prevented, so that the convergence is prevented from deteriorating and the image quality is improved. Can be.

[0023]

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

FIG. 1 shows a color cathode ray tube device equipped with a static convergence device according to the present invention.

That is, the color cathode ray tube comprises a face panel 11 having a substantially rectangular screen and a face panel 1
1 is provided with an envelope having a funnel 12 integrally joined to the face panel 11.
A phosphor screen 13 having a three-color phosphor layer that emits red, blue, and green light is formed.

In the envelope, a shadow mask 15 through which an electron beam 14 passes to perform color selection is disposed opposite to the phosphor screen 13. The shadow mask 15 is mounted on a mask frame 16. While being fixed,
This mask frame 16 is attached to the inner surface of the face panel 11.

Further, in the neck 17 of the funnel 12, a center beam 14G and a pair of side beams 14G are provided.
An in-line type electron gun 18 arranged horizontally in a line for emitting an electron beam 14 composed of R and 14B is provided.
4 is a deflection yoke 19 mounted outside the funnel 12
A color image is reproduced and displayed on the phosphor screen 13 by being deflected by the magnetic field generated by scanning the phosphor screen 13 in the horizontal and vertical directions with the electron beam 14.

A pair of annular purity magnets 20 magnetized to two poles of NS are rotatably mounted on the end face of the deflection yoke 19 on the neck 17 side.

The phosphor screen 13 is formed on the light absorbing layer 2 in the form of a matrix or a stripe by using a photographic printing method.
A phosphor screen 13 of a black matrix type or a black stripe type in which a three-color phosphor layer is embedded is used in one gap.

As described above, when the in-line type electron gun 18 of the three electron beams 14 arranged in a row and emitting the center beam 14G and the pair of side beams 14R and 14B passing on the same horizontal plane is employed, the deflection yoke 19 is used. By setting the horizontal deflection magnetic field to be formed to be a pincushion type as shown in FIG. 9 and the vertical deflection magnetic field to be a barrel type, a static convergence of a simple configuration can be achieved without using a dynamic convergence circuit. Device 2
2 using a self-convergence method.

This static convergence device 22
Has a cylindrical holder 23 made of a synthetic resin such as polypropylene which is mounted on the neck 17 of the color cathode ray tube, as shown in more detail in FIG. Multiple slits 24
Are provided, a plurality of tongue pieces 25 are configured.

A flange 26 having a diameter larger than that of the holder 23 is provided at the intermediate portion. An outer surface of the holder 23 between the flange 26 and the other end of the holder 23 has an axial direction. , A plurality of, for example, a pair of opposing grooves 27 are formed.

On the outer peripheral surface of the end of the holder 23 in which the groove 27 is formed, a screw portion 28 is formed, and the outer peripheral surface of the tongue 25 at the end of the holder 23 in which the slit 24 on the other side is formed. A fastening band 29 for fixing the holder 23 on the outer peripheral surface of the cathode ray tube neck 17 is provided above.
Are arranged, and the fastening band 29 is configured to be fastened and fixed by screws 30.

Further, on the outer periphery of the holder 23 in which the groove 27 is formed, a plurality of annular convergence magnet pairs 31 and 3 magnetized to form a pair of six poles and four poles, respectively.
2 are rotatably mounted, and the magnet pairs 31 and 32
A spacer 3 in which a locking piece 33 press-fitted into the above-mentioned groove 27 is arranged inwardly facing the space between the holders 23 and the end of the holder 23.
4 is attached.

An annular lock ring 36 having a screw 35 provided inside the holder 23 is screwed into a screw portion 28 provided at the end of the holder 23.
Further, a holder 2 corresponding to the side beams 14R and 14B.
A magnetic body 37 for shielding the terrestrial magnetism is mounted in the three internal axial directions to constitute a static convergence device 22 mainly used for a terminal display.

As shown in FIG. 3, the shape of the groove 27 and the locking piece 33 is such that the groove 27 is formed in the tube axis direction of the holder 23, but the width l of the outer portion of the holder 23 is changed.
1 is narrow and the width l3 of the inner portion is widened, the cross-section is formed in a substantially trapezoidal shape. The locking piece 33 of the spacer 34 press-fitted into the groove 27 is also fitted to the outside of the base portion so as to fit. The width l2 is narrow, and the width l4 increases outward from the tip.
Is formed in a substantially inverted trapezoidal cross-section so that is widened.

The outer diameter 14 of the widest part
However, it is possible to press fit by forming the groove 27 to be slightly wider than the maximum inner diameter 13 of the groove 27. If these relationships are shown, they can be expressed as follows.

L1 ≧ l2 l3 <l4 With this configuration, when it is necessary to readjust the convergence at the shipping destination, the lock ring 3
6 is rotated to loosen the tightening force, and the individual convergence magnets 31a, 31b, 32a, 32b are rotated to adjust the convergence magnets to an optimum state. After the adjustment, the lock ring 36 is tightened again to secure the convergence magnet pairs 31 and 32 at the readjusted positions.

At this time, the tightening force of the lock ring 36 is also transmitted to the spacer 34 in contact with the lock ring 36, but the locking piece 33 and the groove 27 of the spacer 34 Is pressed into the locking piece 33
Is firmly fixed and held in the groove portion 27, so that rotation by the rotation of the lock ring 36 can be prevented.

In other words, since the tip of the locking piece 33 is crushed when being pressed into the groove 27, it absorbs the rotational force caused by the rotation of the lock ring 36. 4A, the displacement of the convergence magnets 32a and 32b can be prevented. As shown in FIG. 4A, the rotational force transmitted to the convergence magnet 32b becomes small, and as a result, the amount of movement of the convergence also decreases. As shown in b), the displacement can be kept to the extent that there is almost no effect.

Further, even when the spacer 34 is mounted in the groove 27 of the holder 23, the tip of the locking piece 33 is crushed when pressed in, so that the workability in assembling the static convergence device 22 is also improved. be able to.

As described above, it is possible to prevent the spacer 34 and the convergence magnet 32 from rotating together with the rotation of the lock ring 36 in the readjustment of the convergence without sacrificing the workability during the assembling operation. Excellent convergence characteristics can be set, which contributes to improvement of image quality.

The present invention is not limited to the static convergence device 22 designed for the terminal display, but can be applied to a static convergence device used in a general color television receiver. It is possible.

That is, as shown in FIG. 5, a deflection yoke 19 mounted on the outer peripheral surface of the funnel 12 of the color cathode ray tube.
Has a coil separator 41 formed of a synthetic resin in a funnel shape. A front cover 42 is provided on a large diameter portion of the coil separator 41, and a back cover 43 is provided on a small diameter portion.

A saddle type horizontal deflection coil (not shown) is disposed inside the coil spacer 41, and a funnel having a toroidal type vertical deflection coil 44 wound on the outer surface of the coil spacer 41. Ferrite core 45
Is installed. A small-diameter end portion of the coil spacer 41 is further integrally formed with a holder 23 extending in the tube axis direction and located at the neck 17, and the static convergence device 22 is mounted on the holder 23. .

Alternatively, the static convergence device 2 composed of another piece is provided in the vicinity of the deflection yoke 19.
2 are arranged.

For example, the static convergence device 22 formed of a separate piece is configured as shown in FIG.

That is, a cylindrical holder 23 is formed from a synthetic resin such as polypropylene, and a flange 26 having a diameter larger than that of the holder 23 is provided at one end of the holder 23. A plurality of slits 24 are provided in the axial direction from the end of the holder 23 opposite to the flange 26 to form a plurality of tongue pieces 25.

On the outer peripheral surface of the tongue piece 25, an annular purity magnet pair 20 magnetized to two poles, and
A pair of convergence magnet pairs 31 and 32 magnetized to the poles and the four poles are arranged.

The magnet pairs 20, 31,
32, and at the end opposite to the flange 26, annular spacers 34 are interposed respectively, and further, these magnet pairs 20, 31, 32 are rotatably locked between the flange 26 and the magnets 20, 31, and 32. A fixing piece 46 is provided on the tongue piece 25, and each magnet pair 20, 31, 3 is provided between the fixing piece 46 and the flange 26.
2 is rotatably and elastically supported.

The convergence device 22 having the purity magnet pair 20 is located at the end of the tongue piece 25.
The fixing yoke 19 and the deflection yoke 19 are fixed to the neck 17 of the color cathode ray tube by the fastening band 29 and the screw 30 shown in FIG.

The slit 24 is formed such that the portion on the side of the neck 17 is widened in the same manner as the above-mentioned groove portion 27, and has a substantially trapezoidal cross section so that the width of the outer portion is reduced. The locking piece (not shown in FIGS. 5 and 6) provided on the spacer 34 is formed in a substantially inverted trapezoidal cross section so that the outer diameter of the root portion becomes smaller and becomes wider toward the tip. By pressing the distal end of the locking piece of the spacer 34 into the slit 24 and crushing it, it is possible to firmly fix and hold the spacer.

In this case, the slit 24 is completely synonymous with the groove 27 described in the terminal display embodiment, and is not different from what is expressed as the groove 27.

Further, a portion to which each of the magnet pairs 20, 31, 32 and the spacer 34 is mounted is formed as a groove 27, and only a portion to which the fastening band 29 is mounted is formed as a tongue piece 25 having a slit 24. It is also possible.

In general, in the case of such a color television receiver, since the required specifications are loose compared with those for a display, each magnet pair 20 and 3 is required.
The magnet pair 2 is fixed between the fixing piece 46 and the flange 26 without using the lock ring 36 for fixing and holding
0, 31, 32 and the spacer 34 are elastically pressed and held.

However, when adjusting the purity magnet pair 20 and the convergence magnet pairs 31 and 32,
The spacer 34 interposed therebetween causes co-rotation with the purity magnet pair 20 or the convergence magnets 31a, 31b, 32a, 32b that are being adjusted, and the opposite magnet pair 20, which faces through the spacer 34, Although there has been a problem in that the spacers 31 and 32 are also rotated, the configuration described above can prevent the rotation of the spacers 34, so that the convergence can be reduced as in the case of the above-described display. It is possible to maintain the optimum adjustment value, and it is possible to improve image quality.

In the description of the above embodiment, the groove 27
The description has been given of the case where the relationship between the locking piece 33 and l1 ≧ l2l3 <l4 is satisfied. However, the present invention can further enhance the effect by being configured as shown in FIG. Become.

In FIG. 7, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 7, the configuration of the groove 27 is
The width in the outer surface direction and the inner surface direction with respect to the insertion direction of the spacer 34 is configured to be gradually narrowed in the insertion direction by configuring as follows. Accordingly, the spacer 34 is designed to be pressed more strongly, so that the spacer 34 is more securely fixed.

In this case, the shape of the groove 27 is changed to the groove width l only in the inner surface direction.
Even if it is configured such that l3> l6 so that 3 and l6 are temporarily narrowed and the width in the outer surface direction is l1 = l5, the press-fit state with the locking piece 33 can be ensured.

Further, if the shape of the locking piece 33 is also changed along with the change in the shape of the groove 27, a better fixing effect can be obtained. That is, the width in the outer surface direction of the insertion portion of the groove 27 is defined as l1, and the width in the outer surface direction of the tip portion in the insertion direction is defined as l1.
When 5 is set, the relationship of l1 ≧ 15 is set. When the width of the insertion portion in the inner surface direction is set to 13 and the width of the tip portion in the insertion direction is set to 16 the relationship is set to 13> 16. I do.

On the other hand, the width of the root portion of the locking piece 33 of the spacer 34 located on the side of the 6-pole convergence magnet pair 31 to be inserted first is 17 and the width of the tip portion is 18. And the rear lock ring 3 that is inserted subsequently
Assuming that the width of the base portion of the locking piece 33 of the spacer 34 located on the sixth side is l9 and the width of the tip portion is 110, the following relationships are respectively set.

L1 ≧ l5 ≧ l7 l3 ≧ l6> l8 ll ≧ l7 ≧ 9 l3 ≧ l10>l8> l6 With this configuration, the locking piece 33 of the first spacer 34 to be inserted first is The locking piece 33 of the second spacer 34, which can be firmly pressed into the groove 27 and subsequently inserted, is also used as the locking piece 33 of the first spacer 34.
When the groove is press-fitted, even if it is inserted while slightly expanding the inner wall of the groove 27, since the relation of 18 <110 is established, the locking piece 33 of the second spacer 34 is re-engaged with the groove 27 again. It will be pressed in while pressing the inner wall,
The first and second spacers 34 can be reliably held at predetermined positions of the respective holders 23.

In this case, the locking piece 3 of the first spacer 34
If the inner wall of the groove 27 is not spread out to the left even by the press-fitting of the third piece 3, the locking piece 3 of the first and second spacers 34
Even if the width of No. 3 is configured to have the same width l8 = 110, no significant change occurs in the effect.

In this case as well, a more excellent locking and fixing operation can be maintained as compared with the conventional configuration, so that not only good image quality can be ensured, but also the shape of the locking pieces 33 of the spacer 34 can be individually adjusted. Since it is not necessary to change the configuration, the spacer 34 can be simply configured, and the workability can be improved.

The present invention is not limited to the above-described embodiment. For example, the deflection yoke 19 may have a saddle-saddle type deflection coil configuration, the groove 27 and the locking piece 3.
Also, the shape of 3 is not immediately trapezoidal and inverted trapezoidal, but the first part is formed linearly, and the tip is formed in trapezoidal and inverted trapezoidal shape. It is also possible to form a stepped shape at the position where the position of the groove 34 is located, and to apply a variety of applications and modifications, such as forming the locking piece 33 only in a triangular shape with a concave shape in which the groove width of the groove 27 is all constant. Needless to say, this is possible.

[0067]

According to the present invention, even when readjustment of the convergence is required, the rotation of the spacer can be reliably prevented, so that other magnets opposed to each other via the spacer can be prevented. Since rotation can be prevented and readjustment can be performed without deteriorating the convergence quality, a convergence device with excellent image quality can be provided.

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing a color cathode ray tube device equipped with a static convergence device according to the present invention.

FIG. 2 is an exploded perspective view showing a static convergence device according to the present invention.

FIG. 3 is an explanatory diagram for explaining a relationship between a locking piece and a groove which also constitute the static convergence device.

FIG. 4 is a schematic diagram for explaining an effect of the static convergence device according to the present invention.

FIG. 5 is a side view showing an example in which the static convergence device according to the present invention and a deflection yoke are combined.

FIG. 6 is a side view showing the static convergence device.

FIG. 7 is an explanatory diagram for explaining a relationship between another example of a locking piece and a groove which also constitute the static convergence device.

FIG. 8 is a partially cutaway plan view for explaining a color cathode ray tube device equipped with a conventional static convergence device.

FIG. 9 is an explanatory diagram showing a magnetic field distribution of a deflection yoke constituting the color cathode ray tube device.

FIG. 10 is an exploded perspective view showing a conventional static convergence device.

FIG. 11 is a schematic diagram for explaining a defect of the static convergence device.

[Explanation of symbols]

 17: Neck 20, 31, 32: Magnet pair 23: Holder 26: Flange (fixing means) 27: Groove 33: Locking piece 34: Spacer 35: Screw part 36: Lock ring (Fixing means) 46: Fixing piece ( Fixing means)

Claims (5)

[Claims] 1. A synthetic resin cylindrical holder fixed on an outer peripheral surface of a neck of a color cathode ray tube, a groove formed on the outer peripheral surface of the holder and extending in a tube axis direction, and an outer peripheral surface of the holder. A plurality of ring-shaped magnet pairs rotatably fitted to each other, a ring-shaped separator interposed between the respective magnet pairs and having a locking piece press-fitted and locked in the groove portion; A static convergence device, comprising: fixing means for fixing on the upper surface. 2. The groove is formed to have a substantially trapezoidal cross section so that the inner diameter on the outer side opposite to the outer surface side of the holder is smaller than the inner diameter on the outer surface of the holder. 2. The static convergence device according to claim 1, wherein the outer diameter on the opposite outer side is formed larger than the outer diameter on the side of the connecting portion with the connecting member. 3. The static convergence device according to claim 1, wherein the inner diameter of the groove is gradually reduced with respect to the tube axis direction. 4. The locking piece according to claim 1, wherein an outer diameter of an end opposite to the insertion direction is larger than an end of the locking piece in a direction in which the locking piece is fitted into the groove. The static convergence device according to any one of the above. 5. The fixing means comprises a screw portion formed at an end of the holder, and a rotatable stopper screwed into the screw portion. The stopper is screwed into the magnet pair and The static convergence device according to any one of claims 1 to 4, wherein a separator is fixed on the holder.