JP3533810B2 - Funnel for CRT and CRT sealing method using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a funnel for a cathode ray tube that constitutes a cathode ray tube of a television or the like and a method for sealing a cathode ray tube using the funnel.

[0002]

CRT glass bulb used in the Background of the Invention Usually a television broadcast receiver or the like, blanking of the image display area
A round pipe front glass (that also called hereinafter panel), 該Pa
A funnel mounting the bonded electrode deflection yoke coil panel In the rear of the panel, composed of three glass members the neck for storing an electron gun is further connected to the funnel.

[0003] Since usually takes panel having an image display area of the rectangle, the sealing portion of the funnel panel is a similar rectangle on the image <br/> display area, the sealing portion is rectangular It has a large open end. On the other hand, because the neck of storing the electron gun is cylindrical, the small open end of the neck has become circular. Therefore, when sealing the funnel and the panel , a predetermined positioning accuracy is required. To ensure a predetermined positioning accuracy, on the outer surface near the large open end of the funnel, relatively dimensional accuracy is high, the short sides and the diagonal nearest Rino three positions in the long side, having a reference surface for positioning Pads are provided.

FIG. 1 is a side view of a funnel for a cathode ray tube, and FIG. 2 is a perspective view schematically showing the periphery of a funnel pad. 1 and 2, 1 funnel, 2 pads for determining position, 3 is the reference surface of the pad. Note that FIG <br/> surface of another device described these figures and later also, that shows an exaggerated part of the pad for clarity.

[0005] FIG. 3 have you on the cathode-ray tube of the assembly process
Te, the panel and the funnel is a side view of a sealing Chakusu Ru step, FIG. 4 is a plan view of the process. As shown in FIGS. 3 and 4, the pads 2, 2A, 2B, 2C of the funnel 1 of the cathode ray tube to be sealed are attached to the support members 5, 5A, 5B, 5C.
At a predetermined position, the relative position with the panel 4 is adjusted, and both are sealed by the low melting point powder glass applied on the sealing surface.

At the time of assembly and sealing, the funnel 1 is shown in FIG.
As indicated by the arrow A in FIG. 3, the pad 2A is slightly inclined toward the corner where the two pads 2A and 2C are formed (the inclination is not shown). As a result, these three pads 2A, 2B,
2C is brought into contact with supporters 5A, 5B, 5C made of carbon provided on the assembly jig side to support the funnel 1 and the panel 4 thereon.

Support tools 5A, 5B, 5C on the assembly jig side
Is formed in advance at a predetermined position with a predetermined protruding length, and the end faces of the pads 2A, 2B, 2C on the funnel 1 side are brought into contact with the end faces of the support tools 5A, 5B, 5C, thereby 1 is held in position, positioning between the panel 4 is achieved.

The cathode ray tube in which the panel 4 and the funnel 1 are aligned as described above is baked at a high temperature of about 440 ° C. while being held by this assembly jig, and applied between the panel 4 and the funnel 1. The low melting point powdered glass melted to form a frit seal.

[0009]

Reference surface of the positioning pads [SUMMARY OF THE INVENTION] had ensured dimensional accuracy by grinding using a diamond grinding tool or the like. However, such a reference surface has a large roughness, and there is a problem in that a support made of a carbon material having heat resistance is worn in a short time and the positioning accuracy deteriorates.

It is generally known that the wear amount of a support made of a carbon material can be reduced by reducing the 10-point average roughness R _z of the reference surface of the pad. Therefore, in order to prevent the support made of carbon material from being worn down in a short time, the reference surface is made of alundum (registered trademark).
The finishing treatment was performed with a finishing tool such as urethane resin containing the standard) . However, in order to reduce R _z by such a finishing treatment method, an extremely long finishing time is required and there is a problem that productivity is lowered. For this reason, it has been desired to reduce the amount of wear of the support and increase the productivity.

[0011]

Means for Solving the Problems The present invention has been made to solve the above problems, on the outer surface of the open mouth end for sealing the Brownian tube front glass, for positioning in cathode ray tube funnel having a plurality of pads reference surface is formed, 10 of the reference surface of the pad
The point average roughness R _z and the average waviness period S _m are 0.7% ≦ R
CRT funnel and having a _z / S _m ≦ 3% the relationship, and the R _z is Ru der 1 0 .mu.m or less
To provide a funnel for the Brownian tube.

[0012] In addition, the cathode-ray tube and a funnel, blanking
A round pipe front glass to a method of sealing, the reference surface of the Pas <br/> head, is brought into contact with the support for determining the position of the material of lower hardness more than a Mohs hardness of funnel Position
Performs decided, the cathode-ray tube funnel and the cathode-ray tube
Provided is a cathode ray tube sealing method, which comprises sealing a front glass with a low melting point powder glass.

[0013]

According to the present invention, the wear amount of the support tool is relatively reduced by setting the relationship between the 10-point average roughness R _z of the reference surface of the pad and the average waviness period S _m within a specific range. Very low, the time required for polishing is short, and productivity is good.

[0014] relatively soft abrasion amount of support made by the carbon material is not full determined by only the roughness R _z of the pad reference plane of the funnel, the density of <br/> uneven pad reference plane Also depends on. Since the density of the irregularities is proportional to the reciprocal of the undulation spatial period S _m , the wear amount of the support is R _z and S.
related to _m and. The present invention seeks to solve the above problems by finding an appropriate range of the ratio R _z / S _m of R _z and S _m , and achieving both a relatively short processing time and a relatively small amount of wear of the support. Is.

The appearance of the funnel of the present invention is the same as that of FIGS. 1 and 2 described above. However, the 10-point average roughness R _z of the reference surface 3 of the pad 2 and the average waviness period S _m are 0.7%.
≦ R _z / S you satisfy _m ≦ 3%. In a normal funnel,
As shown in FIG. 4, two pads are provided at substantially both ends on one long side, and one pad is provided at one end on one short side, for a total of three pads. The position and the number of pads may be changed.

When R _z / S _m is less than 0.7% , the time required for polishing sharply increases, and therefore it is 0.7% or more . On the other hand, if R _z / S _m exceeds 3.0%, the amount of wear of the support also greatly increases, which is not preferable. In particular, 1.
It is preferable that 0% ≦ R _z / S _m ≦ 2.5%. Further, even if satisfying the above relationship, it is preferable that R _z not too large for itself, less der Rukoto preferably 10 [mu] m.

As a finishing treatment method for finishing the R _z / S _m of the reference surface of the pad within the above range in a relatively short time, there are the following methods . However, the following method is not shall be limited to these merely illustrative. For example, there is a method in which a polishing tool made of urethane resin impregnated with cerium oxide is attached to a rotary shaft of a spindle motor and rotated at high speed. There is also a method of polishing the reference surface of the positioning pad while supplying a polishing slurry containing water or cerium oxide. With the finishing processing methods such as these, and the grinding removability with a urethane resin, it is coupled 0.7% and the waviness period extension effect with the cerium oxide ≦ R _z /
The reference surface of the pad having a surface satisfying S _m ≤3% is easily formed, which is preferable.

The process of sealing the panel and the funnel in the process of assembling the cathode ray tube described above can be performed in the same manner as the conventional process. Specifically, as shown in FIGS. 3 and 4, the funnel 1 of the cathode ray tube to be sealed.
The pads 2, 2A, 2B, 2C of the support members 5, 5A, 5
B and 5C may be supported at predetermined positions, the relative position with the panel 4 may be adjusted, and both may be sealed with the low melting point powder glass applied on the sealing surface.

At the time of this assembly and sealing, the funnel 1 is pressed toward the corner where the two pads 2A and 2C are formed, as shown by the arrow A in FIG. For this purpose, the stand itself may be tilted and pressed by its own weight, or may be pressed from the opposite side by some mechanical force, for example, an air cylinder or a spring. In this way, by pressing from the direction of arrow A, these three pads 2A, 2B, 2C
Is brought into contact with the support tools 5A, 5B, 5C provided on the assembly jig side to support the funnel 1 and the panel 4 thereon.

That is, the support jig 5A on the assembly jig side,
5B and 5C are formed in advance at predetermined positions with predetermined protrusion lengths, and the end surfaces of the pads 2A, 2B and 2C on the funnel 1 side are brought into contact with the end surfaces of the support tools 5A, 5B and 5C. Thus, the funnel 1 is held in place, positioning between the panel 4 is achieved.

[0021] The position location decided support for 5,5A, 5B, 5C
, It is necessary Ru material der not to damage the pads of the funnel, it is preferable to use the more hardness is lower than the glass funnel Mohs hardness. Then, a material that withstands the firing temperature of the low melting point powder glass is used.

[0022] Therefore, the support is preferably specifically formed using a material of the carbon-based. Carbon-based materials are most suitable in terms of heat resistance, softness that does not damage glass, and slip characteristics (small friction) when pressed.

In this way, the panel 4 and the funnel 1 are
The CRT which has been aligned is fired at a high temperature of about 440 ° C. while being held by this assembly jig, and the low melting point powder glass applied between the panel 4 and the funnel 1 is melted to frit seal. Is formed.

[0024] Finally, step although there may be around, the arrangement of the shadow mask or aperture grille, the application of the phosphor, the electron gun, place the neck tube, CRT and ing.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIGS . 1, 2 and 4, positioning pads 2, 2A, 2B and 2C are integrally formed by projecting at three locations on the outer peripheral edge. The reference surface 3 of the positioning pad of this embodiment is subjected to finishing treatment so that R _z / S _{m on the} surface thereof is 0.7% ≦ R _z / S _m ≦ 3%. As a comparative example, a material outside this range was also prepared.

The values of R _z / S _{m in} these examples are as follows: Example 1 (R _z / S _m = 0.5), Example 2 (R _z / S _m = 0.7), Example 3 (R _z / S _m = 1.5), Example 4 (R _z / S _m) = 2.0), Example 5 ( _Rz / _Sm = 3.0), Example 6 ( _Rz / _Sm = 5.0), Example 7 ( _Rz / _Sm = 7.0), Example 8 ( _Rz / _Sm = 10). In Example 8, R _z was 13 μm, but in other examples, R _z was 10 μm or less.

The polishing of the reference surface 3 of these positioning pads 2 was carried out by attaching a polishing tool made of urethane resin impregnated with cerium oxide to the rotary shaft of a spindle motor and rotating it at a high speed.

FIG. 5 is a Haydon 14D for measuring the dynamic friction resistance of the reference surface when the polishing treatment is performed in this way.
It is a graph which shows the relationship of the amount of relative wear of a carbon support tool in the same frequency | count of friction when a carbon support tool is repeatedly rubbed by a test machine at a load of 1 kg, a speed of 4.6 mm / sec, and a distance of 9 mm.

As a result, within the range of R _z / S _m ≤3%, the relative polishing amount is almost proportional to R _z / S _m , and if it exceeds this, the relative polishing amount increases greatly. When the R _z / S _m was further increased, the relative polishing amount was gradually increased again.

FIG. 6 is a graph showing the relationship between R _z / S _m of this reference plane and the relative polishing processing time. As a result, R _z
It has been found that when it is attempted to set / S _m <0.7%, it takes a considerably long polishing time.

Next, the funnels of Examples 2 to 7 and the panel were sealed. Originally, although you sealed after the phosphor is applied to place the shadow mask in the panel, the following tests, the phosphor was also carried out without also not arranged shadow mask.

First, low melting point powder glass was printed on the end face of the funnel 1 having a substantially rectangular large open end (the side to be sealed with the panel). Next, as shown in FIG. 3 and FIG. 4, the pads 2, 2A, 2 of the funnel 1 of the cathode ray tube to be sealed are attached.
B and 2C were supported at predetermined positions by carbon supporters 5, 5A, 5B and 5C. In this case, by inclining the allowed placing the support platform, support 5,5A funnel 1 by its own weight, 5
It can be pressed against B and 5C.

After that, the panel 4 is placed on it and the relative position thereof is adjusted, and it is baked at about 450 ° C. while being held on this table, and the low melting point powder applied between the panel 4 and the funnel 1 is obtained. The glass was melted to form a frit seal.

[0034]

As described above, according to the present invention, R _z / R of the reference surface of the positioning pad used when the panel and the funnel are sealed with the frit seal in assembling the cathode ray tube.
S _{m is set} to 0.7% ≦ R _z / S _m ≦ 3%. Therefore, the position change of the reference surface due to wear of the support is prevented,
Always Ru lines give a sealing and repositioning of at a fixed reference position. As a result, the reliability of the CRT image receiver is improved, a high-quality image can be realized, and the yield is improved.

Further, in the frit sealing step, it is possible to create a reference surface in which abrasion is suppressed when the reference surface of the pad is brought into contact with the support on the assembly jig side in a relatively short time. Therefore, the time required for polishing the reference surface is short, and the productivity is less likely to decrease. The present invention is
Within not adversely that impair the effects of the present invention, can be variously applied.

[Brief description of drawings]

FIG. 1 is a side view of a funnel for a cathode ray tube.

FIG. 2 is a schematic partial perspective view of a funnel for a cathode ray tube.

FIG. 3 is a side view showing the configuration of a jig for frit seal of a cathode ray tube.

FIG. 4 is a plan view showing the configuration of a frit seal jig for a cathode ray tube.

FIG. 5 is a graph showing the relationship between the relative amounts of wear of carbon supports.

FIG. 6 is a graph showing the relationship between relative polishing processing times for the reference surface of the pad.

[Explanation of symbols]

1: Funnel 2: Pad 3: Reference plane 4: Panel 5: Supporting tool

Claims (3)

(57) [Claims] The outer surface of the open <br/> port end for 1. A sealing between the Brownian tube front glass, the cathode ray tube funnel having a plurality of pads reference surface is formed for the positioning, CRT funnel with 10 point average roughness R _z of the reference surface of the pad and the mean waviness period S _m is characterized by having a _{0.7% ≦ R z / S m} ≦ 3% the relationship. 2. The funnel for a cathode ray tube according to claim 1, wherein the R _z is 10 μm or less . 3. A method for sealing the cathode ray tube funnel according to claim 1 or 2 and a cathode ray tube front glass.
A law, the reference surface of the pad, is brought into contact with the support for determining the position of the lower hardness of the material more than a Mohs hardness of funnel perform positioning by the CRT file <br/> tunnel And a front glass of a cathode ray tube are sealed with a powder glass having a low melting point.