JP2001176385A - Color sorting electrode for color cathode ray tube and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color sorting electrode for a color cathode ray tube and its manufacturing method, in which a misalignment at the center of a screen on a mask plates is prevented from occurring, a crinkling and a twisting of a mask plate are inhibited, and a color sorting electrode of high quality with an advanced color sorting performance is able to be manufactured. SOLUTION: In the color sorting electrode for the color cathode ray tube composed of a flame 1 and a mask plate 6 fixed to the flame 1, the electron beam from the electron gun is sorted and allowed to pass through to a fluorescent screen. In manufacturing, when the mask plate 6 is fixed to the flame 1, it is fixed from a horizontal center portion (2 point positions 8 at the top and the bottom) of the screen to the left end and to the right end simultaneously or alternatively, after the mask plate 6 is positioned and arranged at a given position on the flame 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is widely used as a monitor for various OA equipment such as a television receiver and a computer display monitor.
The present invention relates to a color cathode ray tube called a CRT, and more particularly, to a color selection electrode for a color cathode ray tube which is attached to a phosphor glass panel of the color cathode ray tube, selects an electron beam from an electron gun and transmits the electron beam to a phosphor screen, and a method of manufacturing the same. is there.

[0002]

2. Description of the Related Art A color selection electrode for selecting an electron beam from an electron gun and transmitting the electron beam to a phosphor screen is attached to a phosphor glass panel in front of a color cathode ray tube. This color selection electrode for a color cathode ray tube combines a pair of horizontal members extending in parallel in the vertical direction (horizontal direction) and a pair of vertical members extending in parallel in the left and right direction (vertical direction), and welds their ends. It is composed of an assembled rectangular frame and a mask plate (for example, an aperture grill) stretched while applying a predetermined tension to the frame.
The mask plate transmits the electron beam from the electron gun and is usually fixed to the frame by seam welding.

When assembling and manufacturing a color selection electrode by fixing a mask plate to a frame by seam welding, in order to apply a predetermined tension to the mask plate, compression is performed between a pair of horizontal members extending parallel to the frame. While applying force (see FIG. 1), as shown in FIG. 6, the mask plate 6 is held in a state where tension is applied in the direction indicated by an arrow by being sandwiched by clips 7 so as not to bend. In a state where the seal welding device 1 is pressed against the frame 1 and positioned at a predetermined position, the space between the two is moved from one end side in the horizontal direction to the other end side.
A method of seam welding is adopted according to 0, and a color selection electrode is manufactured by removing an outer peripheral portion of a mask plate after welding.

However, according to the conventional method in which the mask plate 6 is fixed to the frame 1 by seam welding in one direction from one end in the horizontal direction to the other end, the mask plate 6 can be welded in one way. Although there is a merit in that the efficiency can be increased and the productivity can be improved, in the case of this method, a shift occurs at the center position of the screen depending on a difference in upper and lower welding speeds and a method of fixing the mask plate 6. May cause the mask plate 6
This causes wrinkles and twists in the image, which is a factor of deteriorating the color selection performance of the color selection electrode. In particular, in recent high-definition color cathode-ray tubes, such performance deterioration of the color selection electrode becomes a serious quality problem.

[0005]

SUMMARY OF THE INVENTION The present invention has been made to address the above problems, and the first problem is that when the mask plate is fixed to the frame, the center of the screen is accurately positioned. Accordingly, it is an object of the present invention to provide a method of manufacturing a color selection electrode for a color cathode ray tube, which can prevent a center position of a screen from shifting and reduce wrinkles and twists of a mask plate. Another object of the present invention is to provide a color cathode ray tube capable of producing a high quality color selection electrode having high color selection performance by suppressing the occurrence of wrinkles and twists by welding the mask plate in a state of being uniformly stretched. An object of the present invention is to provide a method for manufacturing a color selection electrode. A further object of the present invention is to provide a high-quality color selection electrode for a color cathode ray tube, which has no wrinkles or twists in the mask plate and has high color selection performance.

[0006]

In order to solve the above-mentioned problems, a method of manufacturing a color selection electrode for a color cathode ray tube according to the present invention comprises a frame, a mask plate fixed to the frame, and an electron gun. A method for manufacturing a color selection electrode for a color cathode-ray tube, which selects an electron beam from a fluorescent screen and transmits the same through a phosphor screen, wherein when the mask plate is fixed to the frame, the mask plate is positioned and arranged at a predetermined position on the frame. After that, it is characterized in that it is simultaneously or alternately fixed toward the left and right end sides from a portion which becomes the center of the horizontal screen, and when the mask plate is fixed to the frame, the center of the horizontal screen is By simultaneously or alternately fixing the left and right ends of the mask plate from the part that becomes the center position of the mask plate, the center position of the screen can be accurately positioned first. Preventing misalignment occurrence of central position, it is possible to reduce the wrinkles and twisting of the mask plate.

A method of manufacturing a color selection electrode for a color cathode ray tube according to the present invention comprises a frame and a mask plate fixed to the frame, and selects an electron beam from an electron gun and transmits the same to a phosphor screen. A method of manufacturing a color selection electrode for a color cathode ray tube, comprising: positioning the mask plate at a predetermined position on the frame when fixing the mask plate to the frame; Are fixed simultaneously and alternately from the two point positions toward the left and right end sides, and when the mask plate is fixed to the frame, first the horizontal direction is fixed. By fixing the upper and lower two points at the center of the screen, and then simultaneously or alternately fixing the two points toward the left and right ends, the center position of the screen of the mask plate can be changed. It is possible to more accurately positioned at two points located below the screen can be eliminated deviation occurs in the central position in almost complete, the mask plate of wrinkles and twisting can be reduced at a higher level.

Further, according to the present invention, there is provided a method for manufacturing a color selection electrode for a color cathode ray tube, the method for manufacturing a color selection electrode for a color cathode ray tube, wherein the color selection electrode is provided with a predetermined tension applied to the mask plate. In the stretch type color selection electrode fixed to the frame, when fixing the mask plate to the frame, it is performed in a state where the frame is deformed under pressure, First, the center position of the screen is fixed in a state where a predetermined tension is applied to the mask plate with respect to the frame in a state in which the mask plate is fixed toward the left and right end sides while applying tension from the center position as a starting point. After fixing the mask plate, the frame can be uniformly stretched by releasing the pressure deformation of the frame after fixing the mask plate, and the generation of wrinkles and twists can be more effectively suppressed. It can be.

Further, in the method of manufacturing a color selection electrode for a color cathode ray tube according to the present invention, in the method of manufacturing a color selection electrode for a color cathode ray tube, when the fixing is performed from the center of the screen toward the left and right end portions, The method is performed in a state where tension is applied to the mask plate in a direction of pulling in the horizontal direction of the screen. First, a center position of the screen of the mask plate is fixed. Can be fixed toward the left and right end portions while applying tension in the direction of pulling, so that the occurrence of wrinkles and twists can be further reduced.

In the method for manufacturing a color selection electrode for a color cathode ray tube according to the present invention, the method for manufacturing a color selection electrode for a color cathode ray tube is characterized in that the fixing of the upper and lower two points at the center of the screen is spot welding. The fixing from the two points toward the left and right ends is seam welding. In addition to the seam welding conventionally used when fixing a mask plate to a frame, the upper and lower portions of the center of the screen are also provided. By using the spot welding for fixing the two point positions, the fixing of the upper and lower two points at the center of the screen and the fixing between the two points and the left and right ends can be easily performed by a general-purpose method.

Further, the color selection electrode for a color cathode ray tube according to the present invention is composed of a frame and a mask plate fixed to the frame, and is a color cathode ray for selecting an electron beam from an electron gun and passing it through a phosphor screen. A color selection electrode for a tube, wherein the mask plate is spot-welded to the frame at two upper and lower positions at the center of a horizontal screen, and a seam weld is formed between the two points and the left and right ends. It is characterized in that the frame of the color selection electrode and the mask plate are welded by spot welding at two upper and lower positions at the center of the screen in the horizontal direction and seam welding between the two points and the left and right ends. Thus, the mask plate can be accurately positioned at the center of the screen, and can be welded without wrinkling or twisting.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a perspective view showing a frame structure of a color selection electrode for a color cathode ray tube according to an embodiment of the present invention, and FIGS. 2 to 5 are views showing a manufacturing process of the color selection electrode for a color cathode ray tube according to the embodiment of the present invention. FIG. 2 is a perspective view of a state in which a mask plate such as a flat aperture grill is set to a frame with a predetermined tension applied thereto, and FIG. 3 is spot welding of the mask plate at two positions above and below the center of the screen in the horizontal direction. FIG. 4 is a perspective view of a state in which the mask plate is seam-welded from the upper and lower two points at the center of the screen toward the left end, and FIG. 5 is a perspective view of the mask plate at the upper and lower two points at the center of the screen. It is a perspective view of the state where seam welding is carried out toward the right end part side from.

As shown in FIG. 1, a color selection electrode for a color cathode ray tube comprises a pair of horizontal members 2 and 3 extending in parallel in the vertical direction (horizontal direction) and a pair of vertical members 4 extending in parallel in the left and right direction (vertical direction). , 5 and a frame 1 of a rectangular structure assembled by welding their ends,
The mask plate 6 through which the electron beam from the electron gun is transmitted is stretched in a state where a predetermined tension is applied and fixed by seam welding or the like. Frame 1 below
A method for manufacturing a color selection electrode by welding and fixing the mask plate 6 will be described step by step.

When the mask plate 6 is fixed to the frame 1 by welding, a predetermined tension is applied to the mask plate 6 so that a pair of horizontal members 2 and 3 extending parallel to the frame 1 are provided. As shown in FIG. 1, the frame 1 is deformed by applying a compressive force in the direction of the arrow from a plurality of places (2 to 6 places). On the other hand, as shown in FIG.
The mask plate 6 is placed on the frame 1 in a state where tension is applied in the direction of the arrow by holding the six places around the clip 7 with the clip 7 and held.
Set the position based on the center position of the screen.

In this state, as shown in FIG.
The spot welding device 9 spot-welds upper and lower two-point positions 8 indicated by crosses at the center of the horizontal screen. Next, the mask plate 6 is seam-welded by the seam welding device 10 toward the left and right end portions starting from the upper and lower two-point positions 8 at the center of the screen. At this time, as shown in FIG.
From the starting point, first seam welding toward the left end side, then seam welding toward the right end side as shown in FIG. 5, or welding in the reverse order, or left and right if possible Seam welding can be performed simultaneously toward the end.

When performing the seam welding, as shown in FIGS. 4 and 5, the mask plate 6 is welded while being pulled by applying a predetermined tension in the horizontal direction of the screen with the clip 7 so that the screen of the mask plate 6 is removed. The occurrence of wrinkles and twists at the center can be prevented, and the mask plate 6 can be stretched uniformly. After welding the frame 1 and the mask plate 6 in this manner, the entire mask plate 6 can be uniformly stretched by releasing the pressure deformation of the frame 1, and by removing the outer peripheral portion of the mask plate 6, the color can be reduced. A sorting electrode can be manufactured.

Thus, by welding the frame 1 and the mask plate 6 simultaneously or alternately from the central portion of the screen in the horizontal direction toward the left and right end portions as in the above embodiment, Since the center position of the screen of the mask plate 6 can be accurately positioned first, it is possible to prevent the center position of the screen from shifting and to reduce wrinkles and twists of the mask plate. In particular, the upper and lower two points 8 at the center of the horizontal screen of the mask plate 6 are fixed by spot welding, and then the two points 8 are used as starting points to simultaneously or alternately seam-weld the left and right ends. By going, the center position of the screen of the mask plate 6 can be more accurately positioned at the upper and lower two-point positions 8, so that the occurrence of the shift of the center position of the screen can be almost completely eliminated.

Therefore, according to the above-described manufacturing method, when the mask plate 6 is fixed to the frame 1, wrinkles and twists of the mask plate 6 can be reduced to a higher level. It is possible to manufacture a high quality color selection electrode for a color cathode ray tube, which has high color selection performance, and can sufficiently cope with recent demands for high definition of a color cathode ray tube.

When the mask plate 6 is welded to the frame 1, the frame 1 is pressed and deformed, and a predetermined tension is applied to the mask plate 6 with respect to the frame 1. Spot welding the upper and lower two points 8
Since the mask plate 6 is seam-welded toward the left and right end portions starting from the two point positions 8 at the center of the screen, the pressing and deforming of the frame 1 is released after the welding, so that the entire mask plate 6 can be homogenized. And the occurrence of wrinkles and twists can be suppressed more effectively.
When the mask plate 6 is seam-welded toward the left and right end portions starting from the point position 8, the mask plate 6 is welded toward the left and right end portions while applying tension to pull the mask plate 6 in the horizontal direction of the screen. Therefore, generation of wrinkles and twists can be further reduced, and a higher quality color selection electrode for a color cathode ray tube can be manufactured.

[0020]

As described above in detail, according to the color selection electrode for a color cathode ray tube and the method of manufacturing the same according to the present invention, when the mask plate is fixed to the frame, the center of the screen of the mask plate is accurately positioned. Can be fixed.
For this reason, it is possible to prevent the occurrence of wrinkles and twists of the mask plate due to the positional shift in the center of the screen, and to manufacture a high-quality color sorting electrode having high color sorting performance without wrinkles and twists,
It can respond to the high definition of color CRT.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a frame structure of a color selection electrode for a color cathode ray tube according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a method of manufacturing a color selection electrode according to the embodiment of the present invention, in which a mask plate is set to a frame with a predetermined tension applied.

FIG. 3 is a perspective view showing a method of manufacturing a color selection electrode according to the embodiment of the present invention, in which a mask plate is spot-welded at two upper and lower positions at the center of a horizontal screen.

FIG. 4 is a perspective view showing a method of manufacturing the color selection electrode according to the embodiment of the present invention, in which a mask plate is seam-welded from two upper and lower positions at the center of the screen toward the left end.

FIG. 5 is a perspective view showing a method of manufacturing the color selection electrode according to the embodiment of the present invention, in which a mask plate is seam-welded from two upper and lower positions at the center of the screen toward the right end.

FIG. 6 is a perspective view showing a conventional seam welding method for a frame of a color selection electrode for a color cathode ray tube and a mask plate.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Frame, 6 ... Mask plate, 7 ... Clip, 8 ... Upper and lower two positions, 9 ... Spot welding equipment, 10 ... Seam welding equipment

Claims (6)

[Claims] 1. A method for manufacturing a color selection electrode for a color cathode-ray tube, comprising a frame and a mask plate fixed to the frame, wherein the color selection electrode for a color cathode ray tube is configured to select an electron beam from an electron gun and transmit the selected electron beam to a phosphor screen. When fixing the mask plate to the frame, after positioning and disposing the mask plate at a predetermined position on the frame,
A method for manufacturing a color selection electrode for a color cathode-ray tube, comprising fixing simultaneously or alternately from a center portion of a screen in a horizontal direction toward left and right end portions. 2. A method for manufacturing a color selection electrode for a color cathode ray tube, comprising: a frame; and a mask plate fixed to the frame, wherein the color selection electrode for a color cathode ray tube transmits an electron beam from an electron gun to a phosphor screen. When fixing the mask plate to the frame, after positioning and disposing the mask plate at a predetermined position on the frame,
A color selection electrode for a color cathode-ray tube, characterized by first fixing the upper and lower two points at the center of the screen in the horizontal direction, and then simultaneously or alternately fixing the two points from the two points toward the left and right ends. Production method. 3. The color-selecting electrode is a stretchable color-selecting electrode that is fixed to the frame with a predetermined tension applied to the mask plate, and the frame is fixed to the frame when the mask plate is fixed to the frame. The method for producing a color selection electrode for a color cathode ray tube according to claim 1, wherein the pressure selection is performed under pressure. 4. The fixing device according to claim 1, wherein the fixing is performed from the center of the screen toward the left and right ends while applying a tension in a direction of pulling the mask plate in a horizontal direction of the screen. A method for producing a color selection electrode for a color cathode ray tube according to any one of the above. 5. The method according to claim 2, wherein the fixing at the upper and lower two points at the center of the screen is spot welding, and the fixing from the two points toward the left and right ends is seam welding.
The method for producing a color selection electrode for a color cathode ray tube according to any one of the above. 6. A color selection electrode for a color cathode ray tube, comprising a frame and a mask plate fixed to the frame, for selecting an electron beam from an electron gun and passing the electron beam through a phosphor screen. Characterized in that the mask plate is spot-welded at upper and lower two points at the center of the screen in the horizontal direction and seam-welded between the two points and the left and right ends.