JP2000164122A - Manufacture of frame of color sorting mechanism for cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the torsion of an interdigital tape of an aperture grille of a color sorting mechanism even after concluding the annealing process and the blackening treatment of the color sorting mechanism. SOLUTION: In a method of manufacturing this frame, at the time of fitting an aperture grille 5 for passing the electron beam 2B from an electron gun 2 to a fluorescent surface so as to manufacture an window-like frame 6 for forming a color sorting mechanism 3 for cathode-ray tube 1, temperature in the annealing process for eliminating the distortion of the window-like frame 6 is set at 530-700 deg.C.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a frame of a color selection mechanism provided in a cathode ray tube.

[0002]

2. Description of the Related Art As a cathode ray tube (CRT), for example, there is a so-called trinitron type cathode ray tube. In such a cathode ray tube, red, green and blue phosphor stripes are provided on the inner surface of the cathode ray tube panel, and the phosphor is irradiated with an electron beam to display an image. At that time, a color selection mechanism is used so that the electron beams for illuminating the three phosphors of red, green, and blue can accurately irradiate the predetermined phosphors. This color selection mechanism includes a color selection mask (for example, FAG: Flat Apertur) having slit holes for vertical stripes for selectively transmitting an electron beam.
e Grill) and a frame supporting the color selection mask. The color selection mask is also called an aperture grill, and the color selection mechanism performs an annealing process and a blackening process. This annealing step is for removing distortion such as pressing of the frame and welding to the frame when manufacturing the frame. The blackening step is a step of forming a black coating in an oxidizing atmosphere for a color selection mechanism.

[0003]

Incidentally, such an annealing step is performed only to remove distortion such as pressing and welding of the frame when manufacturing the frame, as described above, and is performed by heat of the frame itself. Changes in the modulus of elasticity are not taken into account. Unless the change in the elastic coefficient due to heat is taken into consideration, the following problem occurs. In the aperture grill of the color selection mechanism, the IDT-type cathode ray tube may cause the interdigital tape (also called the aperture grill tape) to be twisted. When the interdigital tape of the aperture grill is twisted in this way, the twist changes the electron beam irradiation position on the phosphor screen, and the phosphor screen becomes a dark vertical stripe (called a streak). appear. For this reason, not only does the display quality of the cathode ray tube deteriorate, but also the wavy phenomenon of the interdigital tape cannot be suppressed. Therefore, the present invention solves the above-described problems, and performs color sorting of a cathode ray tube that can prevent the ID tape of the aperture grill of the color sorting mechanism from being twisted even after performing the annealing process and the blackening process of the color sorting mechanism. It is an object of the present invention to provide a method for manufacturing a frame of a mechanism.

[0004]

According to a first aspect of the present invention, there is provided a window frame-shaped frame for forming a color selection mechanism for a cathode ray tube by mounting an aperture grill for passing an electron beam from an electron gun through the phosphor screen. When manufacturing, the temperature in the annealing step for removing the strain of the window frame is 5
A method for manufacturing a frame of a color selection mechanism for a cathode ray tube, wherein the temperature is set at 30 ° C to 700 ° C. The temperature in the annealing process for removing the distortion of the window frame is
When the temperature is set at 530 ° C. to 700 ° C., the elastic modulus that is changed by the blackening process in the blackening process is changed in the annealing process in advance. This suppresses the change in the elastic modulus before and after the blackening process,
By reducing the change in the force applied to the tape of the aperture grill, the twisting of the interdigital tape of the aperture grill is prevented. Therefore, it is possible to prevent light and shade vertical streaks from appearing on the fluorescent screen.

According to a second aspect of the present invention, in the method for manufacturing a frame of a color selection mechanism for a cathode ray tube according to the first aspect, the aperture grill has a number of vertical stripe-shaped slit holes,
The aperture grill is fixed to the window frame after the annealing step of the window frame.

According to a third aspect of the present invention, in the method for manufacturing a frame of the color selection mechanism for a cathode ray tube according to the second aspect, the aperture grill is blackened after being fixed to the window frame.

[0007]

Preferred embodiments of the present invention will be described below in detail with reference to the accompanying drawings. Note that the embodiments described below are preferred specific examples of the present invention,
Although various technically preferable limits are given, the scope of the present invention is not limited to these modes unless otherwise specified in the following description.

FIG. 1 shows an example of a cathode ray tube provided with a frame manufactured by a method of manufacturing a frame of a color selection mechanism for a cathode ray tube according to the present invention. The cathode ray tube 1 shown in FIG. 1 is used for a color receiver or the like, has a face plate 1a and a funnel portion 1a, and has an electron gun 2, a color selection mechanism 3 and the like in the cathode ray tube 1. I have. Color sorting mechanism 3
Are arranged so as to face the fluorescent screen 1b on the inner surface side of the face plate 1a. The phosphor screen 1b is formed by arranging phosphors of three colors of red, blue and green, for example, in a stripe shape. The color selection mechanism 3 includes a frame 6 and an aperture grill 5
have.

FIG. 2 shows an example of the frame 6 and the aperture grill 5. The aperture grill 5 is fixed to the frame 6. The aperture grill 5 has a number of slit holes 31 as shown in FIG. 2, and these slit holes 31 are formed between adjacent aperture grill tapes 35. The aperture grill tape 35 is formed, for example, in parallel between the upper frame portion 6A and the lower frame portion 6B of the frame 6, and extends along the Y-axis direction. The Z axis is the tube axis direction of the cathode ray tube 1 in FIG.
The axis indicates the left-right direction of the cathode ray tube 1.

In order to prevent the aperture grill tape 35 from resonating with vibrations such as external sound and impact, one or a plurality of anti-vibration wires 32 are provided facing the aperture grill 5. . This anti-vibration wire 32
Are fixed to a spring member 34 of the frame 6. The reason why the resonance phenomenon of the aperture grill tape 35 is prevented is to prevent the electron beam 2B emitted from the electron gun 2 in FIG. 1 from mislanding that deviates from the original trajectory, and to prevent the display image from deteriorating. It is. The frame 6 constituting the color selection mechanism 3 shown in FIG. 2 is crushed in advance by an external force to pull the aperture grill 5. The elements that determine the reaction force P when the frame 6 is crushed are as shown in the following principle diagram.

FIG. 3 shows a principle model in a state where the frame 6 is crushed, and this principle model uses a cantilevered burr 50. To explain using this cantilevered burr 50, the maximum deflection amount δma as shown in the following equation (1)
It becomes the formula of x. In the assembling process of the color selection mechanism 3, since the maximum deflection amount δmax is controlled to a constant amount, the equation 1 is modified to obtain the reaction force P.

(Equation 1)

(Equation 2) In the equation of the reaction force P in the equation (2), the maximum deflection amount δma
x and the elastic modulus E are values that can be kept constant under the manufacturing conditions. The third power of the quadratic section coefficient I and the length L of the cantilevered burr 50 is a value determined by the shape of the frame 6 in FIG. For this purpose, a principle is used in which the desired reaction force P is changed by changing the elastic coefficient E under the influence of heat in the annealing step for removing the distortion of the frame.

FIGS. 4 and 5 cite examples of the elastic modulus of a metal material issued by the Japan Society of Mechanical Engineers. Referring to FIGS. It shows the rate of decrease in the modulus of elasticity of the metal used. Thus, it is clear that the elastic coefficient decreases depending on the tempering temperature T ° C. As a material of the frame 6, a metal material such as a material such as 13Cr or 18Cr can be used. According to such a principle, the temperature in the annealing step for removing distortion of the window frame 6 is preferably set at 530 ° C. to 700 ° C.
In this way, not only the purpose of removing the distortion of the frame 6 but also the elastic coefficient that changes due to the influence of heat in the blackening process is changed in this annealing step in advance, and the thermal deformation of the frame 6 is prevented in the blackening process. This prevents extra force from being applied to the aperture grill 5 stretched over the frame 6.

If the temperature in the annealing step falls below 530 ° C., the temperature approaches the temperature of the blackening treatment, so that the effect of annealing in the frame state is reduced and the distortion of the frame is removed in the blackening furnace. The color selection mechanism (aperture grill) itself twists due to distortion removal, and when incorporated into a CRT, cannot be incorporated at a uniform distance from the inner surface of the glass, and the function of the color selection mechanism cannot be performed. If the temperature in the annealing step exceeds 700 ° C., the longitudinal elastic modulus of the stainless steel tends to increase, contrary to 700 ° C. or less. This patent is based on the theme of efficiently reducing the longitudinal elastic modulus before assembling the color selection mechanism, requires a large heat capacity, and does not find any merit in characteristics.
The region over 00 ° C. is unnecessary and is not preferable in this respect.
The window frame-shaped frame 6 is 530 ° C. to 70 ° C. in the annealing process.
Annealing at a temperature of 0 ° C. suppresses a change in the reaction force (force) before and after the blackening treatment of the color selection mechanism. The reason for suppressing the change in force before and after the blackening process is as follows.

In recent years, the flatness of the screen of a cathode ray tube for color display, that is, the so-called flat display, has been advanced, and accordingly, the color selection mechanism 3 as shown in FIG. With this, it tends to approach a planar shape. Accordingly, in the case of the conventional aperture grill 5 of a cathode ray tube having a curved surface as shown in FIG.
Can be set relatively close to 90 degrees, but in the flattened aperture grille 5 of the cathode ray tube described above, the incident angle θ2 of the electron beam 2B in the peripheral portion is the incident angle θ2. It becomes considerably smaller than θ1. That is, the displacement h1 of the electron beam 2B of the aperture grill 5 in the curved cathode ray tube of FIG.
In the flat cathode ray tube described above, the displacement h2 of the electron beam 2B of the aperture grille 5 becomes considerably large. For this reason, the twist of the aperture grill tape 35 in the aperture grill 5 in the case of FIG. 7 inhibits the passage of the electron beam 2B and the passage width of the electron beam 2B is more likely to be influenced than in the case of FIG.

FIG. 8 shows an example of the frame annealing frame test. 2 shows the results of an annealed frame test in which the frame 6 was subjected to a blackening process before assembling the aperture grille 5 with respect to the frame 6 of FIG. 2. The blackening process is a process for forming a black coating on the frame in an oxidizing atmosphere. The reason why the black film is formed on the frame in this way is to suppress irregular reflection of the electron beam as much as possible when the electron beam passes through the color selection mechanism, and to suppress the occurrence of red rust of the color selection mechanism in the environment in the manufacturing process. It is. This is because red rust progresses quickly, and when red rust progresses in the CRT and a part of the color selection mechanism becomes fragile and falls into the CRT, it causes a leaf in a high-pressure portion, and the CRT may not function. FIG. 8 is a graph of the results obtained by assembling the aperture grille 5 with respect to the frame 6 alone and measuring the pulling force of the aperture grille tape 35 of the aperture grille 5 with the frequency replaced.

In the graph of FIG. 8, the vertical axis indicates the force of one aperture grill tape 35, and indicates that the vibration frequency of the tape is increased or decreased by increasing or decreasing the force applied to the aperture grill tape. This time, it was proved that even if a frame of the same shape is used, the vibration frequency (= force applied to the tape) of the tape is also reduced by reducing the longitudinal elastic modulus of the material of the frame itself by heat treatment. Also, after the blackening process, which is the actual state of the color selection mechanism, it is less susceptible to the thermal effects required for the blackening process than in the past, and therefore has the same function (= force applied to the same tape) in the actual state. are doing. The horizontal axis is the coordinates in the X-axis direction in FIG. 2 where the aperture grill tapes 35 are arranged. “0” on the horizontal axis is the center of the screen,
“−200” indicates the left end of the screen, and “+200” indicates the right end of the screen. In FIG. 8, a curve L1 obtained by combining a broken line and a circle indicates a state before the blackening process of the conventional product, and a curve L2 obtained by combining a solid line and a black circle indicates the state after the blackening process of the conventional product. A curve L3 obtained by combining a dashed line and a black rectangle indicates a state before the blackening process in the embodiment of the present invention, and a curve L3 obtained by combining a solid line and a black rectangle.
4 shows a state after the blackening process in the embodiment of the present invention.

Before the blackening process, as apparent from a comparison between L1 indicating the state of the conventional product before the blackening process and the curve L3 indicating the state before the blackening process of the embodiment of the present invention, before the blackening process, Embodiments of the present invention have low tensile forces. In addition, a comparison between L2 indicating the state of the conventional product after the blackening process and curve L4 indicating the state after the blackening process of the embodiment of the present invention shows that after the blackening process, after the blackening process of the embodiment of the present invention. Is substantially equal to the curve L2 after the conventional blackening treatment. In other words, in the frames indicated by the curves L3 and L4 that have been subjected to the blackening processing in advance, the amount of change in the blackening processing has decreased because the elastic coefficient has decreased. This effect is achieved by increasing the annealing temperature,
As described above, the same effect is obtained by setting the temperature from 530 ° C. to 700 ° C.

FIG. 9 shows an example of a method of manufacturing a frame of a color selection mechanism of a cathode ray tube according to the present invention. Step S
At P1, the annealing process is performed by setting the temperature in the annealing step for removing distortion of the window frame-shaped frame 6 to 530 ° C. to 700 ° C. In step SP2, the aperture grille is fixed to the frame to form a color selection mechanism. Step S
At P3, a blackening process is performed on the color selection mechanism. Step SP1
Since the annealing temperature is set at 530 ° C. to 700 ° C. in the frame, the longitudinal elastic modulus of the frame greatly changes due to the influence of heat, but by performing this change in the annealing step at the time of manufacturing the frame in advance, The change in the longitudinal elastic modulus corresponding to the change in the blackening process in the subsequent process is performed in advance.

As a result, the interdigital aperture grill tape of the aperture grill is not twisted, and no vertical stripes of light and shade appear on the phosphor screen. In other words, in order to reduce the change in the force applied to the aperture grill tape before and after the blackening process, by suppressing the change in the elastic coefficient during the blackening process, the change in the force in the aperture grill tape is minimized. To From this, it is possible to suppress the twist of the aperture grille tape and prevent light and shade vertical stripes formed on the phosphor screen. Since the amount of creep of the aperture grill tape is reduced, the waving phenomenon of the aperture grill tape due to local creep of the aperture grill tape can also be suppressed.

[0020]

As described above, according to the present invention,
Even after performing the annealing process and the blackening process of the color selection mechanism, it is possible to prevent the interdigital tape of the aperture grill of the color selection mechanism from being twisted.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an example of a cathode ray tube including a color selection mechanism manufactured by a method of manufacturing a frame of a color selection mechanism for a cathode ray tube according to the present invention.

FIG. 2 is a perspective view showing an example of a color selection mechanism.

FIG. 3 is a diagram illustrating a principle model in which a frame of a color selection mechanism is crushed in advance by an external force.

FIG. 4 is a diagram showing a relationship between a tempering temperature and an elastic coefficient in a metal material of a frame.

FIG. 5 is a diagram illustrating a relationship between a tempering temperature and an elastic coefficient in a metal material of a frame.

FIG. 6 is a view showing an example of an incident angle of an electron beam in a conventional curved cathode ray tube.

FIG. 7 is a diagram showing an example of an incident angle of an electron beam in a flat cathode ray tube (flat tube).

FIG. 8 is a diagram showing an example of a frame annealing test.

FIG. 9 is a diagram showing an example of a method for manufacturing a frame according to the present invention.

[Description of Signs] 1 ... Cathode tube, 3 ... Color selection mechanism, 6 ... Frame, 5 ... Aperture grill, 35 ... Aperture grill tape

Claims (3)

[Claims] When manufacturing a window frame-shaped frame for producing a color selection mechanism for a cathode ray tube by attaching an aperture grill for passing an electron beam from an electron gun through the phosphor screen, A method for manufacturing a frame of a color selection mechanism for a cathode ray tube, wherein a temperature in an annealing step for removing distortion of the frame is set to 530 ° C to 700 ° C. 2. The aperture grille has a number of vertical stripe-shaped slit holes, and the aperture grille is fixed to the window frame-like frame after the annealing step of the window frame-like frame is completed. 3. The method for manufacturing a frame of a color selection mechanism for a cathode ray tube according to claim 1. 3. The method according to claim 2, wherein the aperture grill is blackened after being fixed to the window frame.