JP2001155652A - Color cathode ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color selection electrode of color cathode ray tube, which can reduce the cost and give manufacturing facility by correcting miss- landing associated with the thermal expansion of frame due to the electron collision and designing the quantity of it with ease. SOLUTION: A construction of spring holder 19 attached to the frame support patch 12 being used as bimetal, and the free end part 19b being oblique by a predetermined degree to the contacting plane of end part the frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube for supporting a grid structure having slits.

[0002]

2. Description of the Related Art FIG. 7 is a side sectional view showing a schematic structure of a general color cathode ray tube. In the figure, reference numeral 1 denotes a tube, which is formed by joining a panel portion 4 to an open end of a funnel 3 having a neck portion 2. Reference numeral 5 denotes an electron gun disposed in the neck portion 2, 6 denotes a fluorescent screen formed on the inner surface of the face plate 7 of the panel portion 4, and 8 denotes color selection disposed in the panel portion 4 opposite to the fluorescent screen 6. Electrodes 9 are an electron beam and 10 is an electromagnetic deflection device provided on the neck 2 of the tube 1. In this color cathode ray tube, electron beams 9 corresponding to, for example, red, green and blue colors emitted from an electron gun 5 are deflected at the root of the neck portion 2 under the deflection control of an electromagnetic deflector 10. The arrival position of the electron beam 9 is further determined by the color selection electrode 8, and the phosphor of the corresponding color on the phosphor screen 6 is irradiated so that the face plate 7 emits light of a predetermined color.

FIG. 8 is a perspective view showing a conventional spread mask type color selection electrode 8. The color selection electrode 8 is provided with a pair of support rods 1 which are arranged at predetermined intervals in parallel and opposed to each other.
On a frame 15 formed by the pair of elastic supports 13, 14 attached between the support rods 11, 12, a large number of members are inserted between the support rods 11, 12. The grid body 16 is constructed by extending a grid structure 17 provided in parallel. A slit 18 through which an electron beam passes is formed between adjacent grid elements 16 of the grid structure 17. further,
Spring holders 19 are attached to the edge planes of the support rods 11 and 12 and the elastic supports 13 and 14 except for their free end portions. One end of a spring 20 is attached to the free end portions of the spring holders 19. ing. The spring 20 has an open end extending in parallel with the grit structure 17, and has an engagement hole 20a formed in the open end. The engagement hole 20a engages with a pin provided on the inner surface of the panel. , Frame 15 is supported on the inner surface of the panel.

In a conventional color cathode ray tube using a spreading mask type color selection electrode, the frame 15 expands due to the heat generated by the collision of the electron beam, whereby the slit 18 and the fluorescent screen formed on the inner surface of the panel. There is a problem that the correspondence relationship with the phosphor arrangement is shifted and so-called electron beam mislanding occurs.

Conventionally, the means for correcting the mislanding uses a bimetal for the spring holder 19 and a plate 2 having a high expansion coefficient as shown in FIG.
2 is attached to the bottom surfaces of the elastic supports 13 and 14 and acts to bring the grid structure 17 stretched on the frame 15 closer to the fluorescent screen by using the curvature of the elastic supports 13 and 14 due to the temperature rise. there were. Here, by bringing the grid structure 17 closer to the phosphor screen, it is possible to compensate for a shift that has occurred in the correspondence between the slit 18 and the phosphor arrangement on the phosphor screen, and to allow the electron beam to land on a desired phosphor.

FIG. 4 shows a landing correction mechanism for correcting mislanding by using a bimetal for the spring holder 19. FIG. 4A schematically illustrates a state before the temperature rise, and FIG. 4B schematically illustrates a state where the spring holder 19 is curved due to the temperature rise. As shown in FIG. 4B, when the spring holder 19 bends due to the action of the bimetal as the temperature rises, the spring holder 19 moves to the open end 203 of the spring 20 having a height h from the fixed end 201 to the open end 203. The formed engagement hole 20a moves downward. That is, since the position of the engagement hole 20a with the pin (not shown) provided on the inner surface of the panel relatively moves, the position of the pin provided on the panel is fixed. , The entire frame 15 moves by ΔZ1 in the Z-axis direction, and the grid structure 17 stretched there approaches the phosphor screen. The moving distance ΔZ1 of the frame 15 is determined by the height h of the spring 20 and the bending angle α.
Is proportional to

[0007]

In the conventional color cathode ray tube, when the correction means described above is used to eliminate the mislanding of the electron beam when the temperature rises due to the collision of the electron beam, the height h of the spring 20 is increased. Is made as large as possible, and at the same time, the thickness of the plate 22 attached to the bottom surfaces of the elastic supports 13 and 14 is also increased, so that the movement distance ΔZ1 of the frame 15 can be easily designed to a desired size. However, when the height of the spring 20 or the thickness of the plate 22 is changed, the supporting strength of the color selection electrode on the inner surface of the panel and the welding strength of the spring holder 19 and the plate 22 to the frame 15 decrease.
A new problem arises. Therefore, in order to set the correction amount to be larger, the bending angle α is increased by using a bimetal having a higher expansion coefficient than ever before for the spring holder 19.
May be adjusted so as to increase. However, when a material having a high expansion coefficient is used for the spring holder 19, there is a problem that the cost is increased. As described above, in the conventional color cathode ray tube, it was difficult to obtain a sufficiently large correction amount for completely eliminating the mislanding due to the thermal expansion of the frame 15.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a color having a color selection electrode which is easy to design a correction amount of a landing change and is excellent in productivity and cost. The purpose is to obtain a cathode ray tube.

[0009]

In the color cathode ray tube according to the present invention, the grid structure is provided on the inner surface of the panel such that the slit formed in the grid structure is opposed to the fluorescent screen on the inner surface of the panel at a predetermined distance. In a color cathode ray tube supported by pins provided, a frame to which a grid structure is fixed, and a spring fixed to an edge plane of the frame, made of bimetal and having a fixed end at one end and a free end at the other end A holder and a plate-shaped spring having one end fixed to a free end portion of the spring holder, the other end forming an open end, and an engagement hole formed on the open end side to be able to engage a pin on the inner surface of the panel. Wherein the free end portion of the spring holder is fixed at a predetermined angle with respect to the plane of the edge of the frame.

In the color cathode ray tube according to the present invention, the spring holder has a step between the fixed end and the free end thereof, and the size of the step is increased between the pin on the inner surface of the panel and the opposite side. Are different.

Further, in the color cathode ray tube according to the present invention, the spring holder has a twist at a predetermined angle at a free end portion with respect to a fixed end in a plane of an edge portion of the frame.

In addition, in the color cathode ray tube according to the present invention, the spring holder is fixed to the edge plane of the frame with a wedge-shaped spacer interposed therebetween, and forms a predetermined angle with respect to the edge plane of the frame. Things.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. FIG. 1 is a perspective view showing a color selection electrode of the color cathode ray tube according to the first embodiment of the present invention. The color selection electrodes according to the first embodiment are arranged in parallel with each other at a predetermined interval, and are mounted between a pair of support rods 11 and 12 made of, for example, stainless steel. For example, on a frame 15 including a pair of elastic supports 13 and 14 made of, for example, chromium molybdenum steel, a grid structure in which a number of grid elements 16 provided between the support rods 11 and 12 are provided in parallel. 17, and a slit 18 through which an electron beam passes is formed between adjacent grid elements 16. A spring holder 19 composed of a bimetal in which two types of metal plates having different coefficients of thermal expansion are bonded to the upper and lower support rods 11 and 12 and the left and right elastic supports 13 and 14 of the frame 15 on the respective edge planes, One end is fixed with its free end portion, and a spring 20 is attached to each free end portion. In the first embodiment, a step is provided between the fixed end and the free end of the spring holder 19 fixed to the support rods 11 and 12, and the step is formed between the pin provided on the inner surface of the panel and the corresponding pin. It continuously changes so as to have different sizes on the opposite side.

FIG. 2 is an enlarged partial perspective view showing the spring 20 and the spring holder 19 fixed to the support rod 12. As shown in FIG. FIG. 3 is a view of the spring holder 19 as viewed from the fixed end side to the free end side. Spring holder 19
Is fixed to an outer edge plane of the support rod 12, and a free end 19b is formed to extend downward with a step 19c therebetween. The size of the step 19c continuously changes in the left-right direction, so that the step gradually increases in the extending direction of the spring 20 fixed to the free end 19b, that is, in the direction of a pin provided on the inner surface of the panel. Is formed. The spring 20 has a fixing surface 201 that is fixed to the free end 19 b of the spring holder 19, and the fixing surface 2.
1 to the outside of the frame 15, that is, a spring portion 202 that bends in the −Y-axis direction, and an engagement surface 203 in which the engagement hole 20 a is formed. Spring holder 1
9 has an angle θ shown in FIG. 3 with respect to its fixed end 19a. A spring 20 is attached to the free end 19b.
Is fixed to the fixing surface 20 of the spring 20.
1 is an angle θ with respect to the edge plane of the frame 15, and as described below, the moving distance ΔZ2 of the frame 15 when the spring holder 19 is curved can be easily designed.

Next, the magnitude of the correction amount of the landing error in the color cathode ray tube of the first embodiment will be described. FIG. 4 is a view showing a spring holder in a conventional color cathode ray tube. On the other hand, in the spring holder according to the first embodiment, the free end 19b is
9a, it is inclined by an angle θ as shown in FIG. In the color selection electrode having the conventional spring holder shown in FIG. 4, as described above, when the electrode is bent in the Y-axis direction by the angle α due to the action of the bimetal,
The correction amount ΔZ1 is proportional to the product of the height h of the spring 20 and cos α. On the other hand, when the spring holder 19 inclined by the angle θ as shown in FIG. 5A is heated, the free end 19 b serving as a fixing surface of the spring 20 is heated.
Is displaced in the direction indicated by the arrow to the position indicated by the dashed line. Due to the curvature of the free end 19b, unlike the case of FIG. 4, the spring 20 is displaced not only in the Y-axis direction component but also in the X-axis direction component. That is, the spring 2
In addition to the height h (corresponding to the height h in FIG. 4) of the middle spring portion 202 from the fixing surface 201 to the free end 203 in the Y-axis direction (corresponding to the height h in FIG. 4), the spring portion 202 of the spring 20 in the X-axis direction. A displacement in the Z-axis direction according to the length L occurs. As a result, the correction amount ΔZ2 relating to the position of the engagement hole 20a of the spring 20 shown in FIG.
The product of (Y-axis direction component) and cos θ, that is, the displacement due to the YZ rotation component of the curve, and the product of the length L (X-axis direction component) of the spring 20 and sin θ, that is, the displacement due to the XZ rotation component of the curve. The size is defined by the sum of That is,
The magnitude of the correction amount ΔZ2 is determined not only by the bending angle α of the spring holder 19 but also in proportion to the inclination angle θ.

Generally, the length L of the spring 20 is designed to be larger than the height h, so that the spring 20 of the conventional spring holder 19 as shown in FIG. With the spring 20 fixed to the spring holder 19 having the inclination angle θ, the correction amount ΔZ2 can be set to a larger value than the correction amount ΔZ1 caused by bending. Therefore, when a certain amount of heat is applied to the spring holder 19, the spring holder 19 is directly attached to the plane of the edge of the support rods 11 and 12 as in the conventional case, and the inclination angle is changed as in the first embodiment. If so, there will be a difference in the magnitude of the correction amount. For example, when a spring having h = 2.5 mm and L = 56.5 mm is fixed to a spring holder having a thickness of 2 mm and the frame is heated to a temperature at which the frame is saturated, a collar in which the inclination angle θ of the spring holder 19 is 2 degrees. The correction amount ΔZ2 of the cathode ray tube is smaller than the conventional correction amount ΔZ1 in which θ is 0 degree.
It increased by about 15 μm. That is, since such a difference in the correction amount depends on the inclination angle θ of the spring holder 19, by determining an appropriate inclination angle, a desired correction amount can be obtained when heating to a predetermined temperature. It becomes easier to design.

According to the first embodiment described above, a desired correction amount can be obtained without changing the material and thickness of the spring holder 19, the plate 22, and the like. As a result, productivity and cost are reduced. A color cathode ray tube excellent in surface quality can be obtained. In the spring holder 19 of the first embodiment described above, the step is formed so that the free end forms a predetermined angle with respect to the edge plane of the frame, but the free end is twisted at a predetermined angle. However, the same effect can be obtained.

The same effect can be obtained not only when the spring holder 19 having the step is attached to the support rods 11 and 12 but also to the elastic supports 13 and 14 as described above. Needless to say. However, in the case of the spring holder 19 attached to the elastic supports 13 and 14, the free end is formed to extend upward in the fixed end, so that the grid structure is attached to the fluorescent screen as in the first embodiment. To approach them, the direction of inclination of the step of the spring holder 19 must be reversed.

Further, the spring holder 19 is connected to the support rod 1.
Elastic support 1 at similar inclination angles
By attaching it to 5 and 16, it is possible to more effectively design the mislanding correction amount.

Embodiment 2 FIG. 6 is an enlarged view showing a mounting portion of a spring holder according to the second embodiment. As in the first embodiment, a spring holder 19 is fixed to the support rods 11 and 12 and the elastic supports 13 and 14 except for a free end. One end of the spring holder 19 is fixed and the other end is open. A spring 20 as an end is attached. In the second embodiment, as shown in FIG. 6, the spring holder 19 is fixed to the plane of the edge of the support rod 12 at a predetermined inclination angle θ with the wedge-shaped spacer 21 interposed therebetween. Spring holder 19 in this case
Has the same shape as the conventional one.

In the color selection electrode configured as described above, the effect of facilitating the design of the correction amount can be obtained as in the case of the first embodiment.

In each of the above-described embodiments, the spring holder 19 is mounted at four locations, that is, up, down, left, and right. Can also be applied to a case in which is disposed on the inner surface of the panel of the glass tube.

[0023]

Since the present invention is configured as described above, it has the following effects.

According to the color cathode ray tube of the present invention, the grid structure is moved by the pins provided on the inner surface of the panel so that the slit formed in the grid structure faces the fluorescent screen on the inner surface of the panel at a predetermined distance. In a supporting color cathode ray tube, a frame to which a grid structure is fixed, a spring holder fixed to an edge plane of the frame, made of bimetal and having one fixed end and a free end portion at the other end side, A plate-shaped spring having one end fixed to a free end portion of the holder, the other end forming an open end, and an open end formed with an engagement hole capable of engaging with a pin on an inner surface of the panel; The free end of the frame is fixed at an angle to the edge plane of the frame, making it weldable without increasing costs. Strength it becomes possible to easily design the correction amount of the deviation of the landing due to temperature rise during driving intact.

In the color cathode ray tube according to the present invention, the spring holder has a step between the fixed end and the free end, and the step is formed between the pin on the inner surface of the panel and the opposite side. Since the magnitudes of the deviations are different, it is possible to easily design the correction amount of the landing deviation due to the temperature rise during driving without increasing the cost while maintaining the weldability and strength.

Further, according to the color cathode ray tube according to the present invention, the spring holder has a twist at a predetermined angle at a free end portion with respect to a fixed end in a plane of an edge portion of the frame, thereby increasing costs. It is possible to easily design the correction amount of the landing deviation due to the temperature rise during driving without changing the weldability and strength.

Further, according to the color cathode ray tube of the present invention, the spring holder is fixed to the edge plane of the frame with a wedge-shaped spacer interposed therebetween, and forms a predetermined angle with respect to the edge plane of the frame. Therefore, it is possible to easily design a correction amount of a landing deviation due to a temperature rise during driving without increasing the cost while maintaining the weldability and strength.

[Brief description of the drawings]

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

FIG. 2 is a partially enlarged view showing a spring holder mounting portion of the color cathode ray tube according to the first embodiment of the present invention.

FIG. 3 is an enlarged view of a spring holder.

FIG. 4 is a partially enlarged view for explaining a mislanding correction mechanism using a bimetal.

FIG. 5 is a partially enlarged view for explaining a mislanding correction mechanism using a spring holder, which is a feature of the color cathode ray tube according to the first embodiment of the present invention.

FIG. 6 is a partially enlarged view for explaining a mislanding correction mechanism using a spring holder, which is a feature of the color cathode ray tube according to the second embodiment of the present invention.

FIG. 7 is a sectional view showing a schematic configuration of a color cathode ray tube.

FIG. 8 is a perspective view showing a conventional color selection electrode.

[Explanation of symbols]

1 cathode ray tube, 2 neck, 3 funnel, 4 panel, 5 electron gun, 6 phosphor screen, 7
Face plate, 8 color sorting electrode, 9 electron beam, 15 frame, 16 grid element, 17
Grid structure, 19 Spring holder, 20
Spring, 21 spacer, 22 plate.

Claims (4)

[Claims] 1. A color cathode ray tube supporting a grid structure with pins provided on the panel inner surface such that a slit formed in the grid structure faces a fluorescent screen on an inner surface of the panel at a predetermined distance, A frame to which a structure is fixed, a spring holder fixed to an edge plane of the frame, made of bimetal and having a fixed end at one end and a free end portion at the other end side; and a free end portion of the spring holder. One end is fixed,
A plate-shaped spring having an open end at the other end and having an engagement hole engageable with a pin on the inner surface of the panel on the open end side, wherein a free end portion of the spring holder is an edge of the frame. A color cathode ray tube fixed at a predetermined angle to a part plane. 2. The spring holder has a step between a fixed end and a free end thereof, and the size of the step differs between a pin side of the inner surface of the panel and an opposite side thereof. The color cathode ray tube according to claim 1. 3. The color cathode ray tube according to claim 1, wherein the spring holder has a twist at a predetermined angle at a free end portion with respect to a fixed end of the frame at an edge plane. . 4. The frame according to claim 1, wherein the spring holder is fixed to an edge plane of the frame with a wedge-shaped spacer interposed therebetween, and forms a predetermined angle with respect to the edge plane of the frame. 2. The color cathode ray tube according to 1.