JPH11354039A - Color cathode-ray tube with shadow mask - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a color cathode-ray tube with a shadow mask 5, capable of suppressing the generation of a doming phenomenon by a correcting function in a third stage, even if a doming phenomenon in a first stage is larger than a doming phenomenon in a second stage. SOLUTION: This color cathode-ray tube has a fluorescent screen 4 formed on the inner surface of a face plate 1F in a panel part 1, a shadow mask 5 arranged so as to face the fluorescent screen 4, fixed to the inside of the panel part 1 by the support of a support frame 6, an electron gun 8 housed in a neck part 2, and a deflecting yoke 7 fit to the outer circumference of a funnel part 3. As a spring 10 for fitting the support frame 6 holding the shadow mask 5 to the inside of the panel part 1, two metal spring plates whose one ends are bound in a V-shape are used, the binding side of two metal spring plates is faced to an electron gun 8 side, and other ends of the two metal spring plates are fixed to the inside of the panel part 1 and the support frame 6 respectively.

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 having a shadow mask and, more particularly, to an improvement in a spring for mounting a support frame holding a shadow mask in a panel portion to minimize doming. The present invention relates to a color cathode ray tube having a shadow mask for suppressing.

[0002]

2. Description of the Related Art In general, a color cathode ray tube provided with a shadow mask is disposed opposite to a fluorescent surface formed on the inner surface of a face plate of a panel and a fluorescent surface, and is mounted in the panel by holding a support frame. A shadow mask, an electron gun housed in the neck portion, and a deflection yoke mounted on the outer periphery of the funnel portion. And
The three electron beams projected from the electron gun are deflected by the deflection yoke and illuminate the fluorescent screen through the electron beam passage holes provided in the shadow mask to display a color image on the fluorescent screen.

In this case, a support frame for holding the shadow mask is attached to the inside of the panel by a spring, and a spring in which one ends of two metal springs are connected to each other is used. In this case, the other ends of the two metal springs are joined to the shadow mask and the support frame, respectively, with the joint of the two metal springs facing the phosphor screen, and the shadow mask is held by the support frame. Is configured.

FIG. 5 is a partial sectional view showing a state in which a support frame is mounted in a panel portion of a color cathode ray tube having the above-mentioned known shadow mask.

In FIG. 5, 51 is a panel portion, 51F is a face plate, 52 is a shadow mask, 52S is a skirt portion, 52H is an electron beam passage hole, 53 is a support frame, 54 is a stud pin, 55 is a spring,
6 is an electron beam.

The panel portion 51 has a fluorescent surface (not shown) attached to the inner surface of the face plate 51F, and stud pins 54 standing upright on the inner side surface. The shadow mask 52 has a large number of electron beam passage holes 52H in a perforated surface, and has a skirt portion 52S hanging down from a peripheral portion of the perforated surface.
3 and is held in the support frame 53 by spot welding. The support frame 53 is attached to the inside of the panel portion 51 via a spring 55 in a state where the shadow mask 52 is arranged to face the fluorescent surface. Spring 55
Is a combination of one end of two metal springs,
One end of each of the two metal springs is attached to the outer peripheral surface of the support frame 53 and the stud pins 54 with the joints facing the fluorescent surface.

In the above configuration, the electron beam 56 projected from the electron gun (not shown) is changed in traveling direction by a deflection yoke (not shown),
Irradiating the fluorescent screen through the electron beam passage hole 52H of No. 2;
The required color image is displayed on the fluorescent screen. In this case, a part of the energy of the electron beam 56 projected on the shadow mask 52 is irradiated to the fluorescent screen through the electron beam passage hole 52H, but the remaining energy collides with the shadow mask 52, and at the time of collision, Shadow mask 5 due to heat generated
2, the shadow mask 52 thermally expands, and thereafter, the heat of the shadow mask 52 is transmitted to the support frame 53, and the support frame 53 also thermally expands.

FIGS. 6 (a) and 6 (b) are explanatory views showing a moving state of an electron beam trajectory due to thermal expansion of a shadow mask or the like in a color cathode ray tube having a known shadow mask.

In FIGS. 6A and 6B, the same components as those shown in FIG. 5 are denoted by the same reference numerals.

First, the electron beam 56 collides with the shadow mask 52, thereby increasing the temperature of the shadow mask 52 and causing the shadow mask 52 to thermally expand (hereinafter, this is referred to as a first stage). As shown in FIG. 6A, the perforated surface of the shadow mask 52 thermally expands and changes from a state shown by a solid line to a state shown by a dotted line, and the position of each electron beam passage hole 52H is changed to a fluorescent surface. Side, and the orbital position of the electron beam 56 for irradiating the fluorescent surface is slightly shifted toward the center from the state shown by the solid line to the state shown by the dotted line.

Next, the electron beam 56 is applied to the shadow mask 5.
2, the temperature of the shadow mask 52 further rises, and the temperature of the shadow mask 52 becomes
3 and thermal expansion of the support frame 53 together with the shadow mask 52 (hereinafter referred to as a second stage), as shown in FIG. 6B, the perforated surface of the shadow mask 52. Then, the support frame 53 thermally expands and changes from the state shown by the dotted line to the state shown by the dashed line, and the electron beam passage holes 52 slightly moved to the fluorescent surface side.
The position of H is moved outward, and this time, the orbital position of the electron beam 56 irradiating the fluorescent surface is shifted outward from the state shown by the dotted line to the state shown by the dashed line.

During this second phase, the support frame 5
The bimetal spring 55 having a rising temperature of 3
And the bimetallic action of the two metal springs 55 prevents the orbital position of the electron beam 56 irradiating the phosphor screen from being excessively shifted from the state shown by the dotted line to the state shown by the dashed line, and as a whole the shadow mask The displacement of the orbital position of the electron beam 56 due to the thermal expansion of the support frame 53 and the support frame 53 is suppressed.

Incidentally, such a phenomenon that the orbital position of the electron beam 56 is displaced is called a so-called doming phenomenon. When the doming phenomenon occurs, the electron beam 56 whose orbital position is displaced causes the phosphor surface to be shifted. Irradiation of other phosphors without irradiating the above-mentioned original phosphor causes a color shift in a displayed image.

For this reason, the color cathode ray tube provided with the above-mentioned known shadow mask has a state in which the orbital position of the electron beam 56 irradiating the phosphor screen in the first stage is shifted toward the center.
In the second stage, the outward transition of the orbital position of the electron beam 56 for irradiating the fluorescent surface and the excessively outward transition of the orbital position of the electron beam 56 for irradiating the fluorescent surface during the third stage are suppressed. The balance is preferably set so as to suppress the occurrence of a shift in the orbital position of the electron beam 56 due to the thermal expansion of the shadow mask 52 and the support frame 53.

[0015]

The color cathode ray tube provided with the above-mentioned shadow mask has a state in which the orbital position of the electron beam 56 for irradiating the phosphor screen in the first stage is shifted toward the center (the first stage of doming). Phenomenon), the outward transition of the orbital position of the electron beam 56 irradiating the fluorescent surface in the second stage (the doming phenomenon of the second stage), and the orbital position of the electron beam 56 irradiating the fluorescent surface during the third stage Of the electron beam 56 due to the thermal expansion of the shadow mask 52 and the support frame 53, that is, the occurrence of the doming phenomenon is suppressed.

In this case, the color cathode ray tube provided with the known shadow mask has an electron beam 56 using the spring 55 in the third stage when the doming phenomenon in the second stage is larger than that in the first stage. The occurrence of the doming phenomenon can be effectively suppressed by suppressing the excessive transition state to the outside of the orbital position.
When the doming phenomenon in the third stage is large, the correction function in the third stage does not function effectively, so that there is a problem that the occurrence of the doming phenomenon cannot be suppressed anymore.

The present invention has been made to solve such a problem, and its object is to reduce the doming phenomenon in the second stage.
An object of the present invention is to provide a color cathode ray tube having a shadow mask that can suppress the occurrence of the doming phenomenon by the correction function in the third step even when the doming phenomenon in the first step is large.

[0018]

In order to achieve the above object, a color cathode ray tube having a shadow mask according to the present invention comprises a metal frame attached to a spring for attaching a support frame holding the shadow mask in a panel portion. The other ends of the two metal springs are fixed to the inside of the panel and the support frame, with the ends of the two springs connected in a V-shape, with the connection sides of the two metal springs facing the electron gun. Means.

According to the above means, a spring for attaching the support frame to the inside of the panel is formed by connecting one end of two metal springs in a V-shape, and the connecting side of the two metal springs is connected to the electron gun. Since the support frame is attached to the panel part with it facing to the side,
Even when the first-stage doming phenomenon is larger than the second-stage doming phenomenon, when the support frame thermally expands, the support frame is caused to move away from the phosphor screen by a spring, and the first-stage doming phenomenon is performed. It is possible to suppress the doming phenomenon and suppress the occurrence of the doming phenomenon as a whole.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In a preferred embodiment of the present invention, a color cathode ray tube provided with a shadow mask is disposed opposite a fluorescent surface attached to an inner surface of a face plate of a panel section and a fluorescent surface. A support mask holding the shadow mask, comprising a shadow mask attached in the panel by holding the electron gun, an electron gun housed in the neck, and a deflection yoke mounted on the outer periphery of the funnel. The two metal springs attached to the panel portion are formed by connecting one end of two metal springs in a V-shape, and the two metal springs are connected with the connection side of the two metal springs facing the electron gun. Are fixed to the inside of the panel portion and the support frame.

According to the embodiment of the present invention, as a spring for attaching the support frame to the inside of the panel portion, two metal springs each having one end connected in a V-shape are used. Since the support frame is attached to the panel with the connection side facing the electron gun, the second stage doming phenomenon, that is,
The first stage doming phenomenon, that is, the center of the orbital position of the electron beam irradiating the phosphor screen in the first stage, as compared with the outward transition of the orbital position of the electron beam irradiating the phosphor surface in the second stage. Even when the direction of movement in the direction is large, when the support frame is thermally expanded, such a spring arrangement allows the support frame to move away from the phosphor screen, thereby preventing a large first-stage doming phenomenon. It is possible to suppress the occurrence of the doming phenomenon as a whole and eliminate the occurrence of color shift in the displayed image.

[0022]

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

FIG. 1 is a sectional view showing a schematic configuration of an embodiment of a color cathode ray tube having a shadow mask according to the present invention.

In FIG. 1, 1 is a panel portion, 1F is a face plate, 2 is a neck portion, 3 is a funnel portion, 4 is a fluorescent surface, 5 is a shadow mask, 5H is an electron beam passage hole, and 5U is a perforated surface. 5S is a skirt portion, 6 is a support frame, 7 is a deflection yoke, 8 is an in-line type electron gun, 9
Denotes a spring, 10 denotes a stud pin, 11 denotes an adjustment magnet, and 12 denotes an electron beam.

The vacuum envelope (glass bulb) constituting the color cathode ray tube has a large-diameter face plate 1F.
, A long and narrow cylindrical neck portion 2 accommodating an in-line type electron gun 8 therein, and a substantially funnel-shaped funnel portion 3 connecting the panel portion 1 and the neck portion 2 to each other. The panel portion 1 has a fluorescent surface 4 attached to the inner surface of the face plate 1F. Shadow mask 5
A hole portion 5U having a large number of electron beam passage holes 5H, and a skirt portion 5S hanging down from the periphery of the hole portion 5U,
The outer peripheral surface of the skirt portion 5S and the inner surface of the support frame 6 are spot-welded and held in the support frame 6.
The support frame 6 is attached to a stud pin 10 erected in the peripheral edge of the panel section 1 via a spring 9 such that the perforated section 5U of the shadow mask 5 is arranged to face the fluorescent screen 4. . The deflection yoke 7 is mounted on the outside of the funnel 3 near the neck 2, and the in-line type electron gun 8 is housed inside the neck 3. The three electron beams (only one is shown in FIG. 1) 12 emitted from the in-line type electron gun 8 are deflected in a predetermined direction by the deflection yoke 7 and then pass through the electron beam through the shadow mask 5. The light of the corresponding color on the phosphor screen 4 is projected through the hole 5H. The adjustment magnets 11 are arranged side by side on the outer periphery of the neck portion 2.

In this case, the spring 9 has a configuration in which each one end of two metal springs is joined, and the other end of each of the two metal springs is arranged with one end thereof facing the in-line type electron gun 8 side. Are attached to the outer periphery of the support frame 6 and the stud pins 10, respectively.

The operation of the color cathode ray tube provided with the shadow mask of this embodiment having the above-described configuration, that is, the image display operation is almost the same as the image display operation of the known color cathode ray tube of this type. The description of the image display operation in the color cathode ray tube having the shadow mask of the embodiment is omitted.

FIG. 2 is a partially enlarged sectional view showing a state in which the support frame 6 is mounted in the panel section 1 in the color cathode ray tube having the shadow mask of the present embodiment shown in FIG. is there.

In FIG. 2, the same components as those shown in FIG. 1 are denoted by the same reference numerals.

As shown in FIG. 2, the support frame 6 holds the shadow mask 5 by spot welding the skirt portion 5S of the shadow mask 5 on the inner peripheral surface, and holds the shadow mask 5 between the outer peripheral surface and the stud pin 10. Spring 9 provided
Is attached inside the panel section 1. In this case, the shadow mask 5 is arranged so that the perforated portion 5U faces the fluorescent screen 4.

FIGS. 3 (a) and 3 (b) are illustrations showing a moving state of an electron beam orbit due to thermal expansion of a shadow mask or the like in a color cathode ray tube having a shadow mask according to the present embodiment. .

In FIGS. 3A and 3B, the same components as those shown in FIG. 1 are denoted by the same reference numerals.

Here, FIGS. 1, 2, 3 (a), (b)
The following describes the state of movement of the electron beam trajectory due to thermal expansion of the shadow mask 5 and the support frame 6 in the color cathode ray tube having the shadow mask of the present embodiment, using FIG.

First, the operation of the color cathode ray tube is started,
After the trajectory of the electron beam 12 emitted from the in-line type electron gun 8 is changed by the deflection yoke 7, when irradiating the fluorescent screen 4 through the electron beam passage hole 5H of the shadow mask 5, a part of the electron beam 12 Collides with the shadow mask 5, whereby the temperature of the shadow mask 5 sequentially increases, causing the shadow mask 5 to undergo thermal expansion (hereinafter, this phenomenon is referred to as a first stage). In this first stage, as shown in FIG.
5U perforated surface forward (fluorescent surface 4 direction) due to thermal expansion of
The perforated surface 5U changes from the state shown by the solid line to the state shown by the dotted line, the position of each electron beam passage hole 5H is slightly moved toward the fluorescent screen 4, and the electron beam 1 irradiating the fluorescent screen 4 is irradiated.
The two orbital positions shift slightly toward the center so that the position shown by the solid line changes from the state shown by the dotted line.

Next, when the operation of the color cathode ray tube is continued, a part of the electron beam 12 continues to collide with the shadow mask 5 and the temperature of the shadow mask 5 further increases. The heat is transmitted to the frame 6 and the temperature of the support frame 6 is increased, so that the support frame 6 and the shadow mask 5 undergo thermal expansion (hereinafter, this phenomenon is referred to as a second stage). In this second stage, as shown in FIG.
Expands in the forward direction (toward the fluorescent surface 4), and the thermal expansion of the support frame 6 causes the shadow mask 5 to be pulled outward and in the inline type electron gun 8 side. The position of each electron beam passage hole 5H slightly moved to the fluorescent screen side in the first stage is moved outward, and this time,
The orbital position of the electron beam 12 irradiating the fluorescent screen 4 shifts outward from the state shown by the dotted line to the state shown by the dashed line.

During this second stage, the support frame 6
Is transmitted to a spring 9 composed of two metal springs, and the spring 9 is deformed like a spring 9 'by the bimetallic action of the two metal springs. Due to the deformation of the spring 9, the transition of the perforated surface 5 </ b> U of the shadow mask 5 toward the fluorescent surface 4 in the first stage is changed to the in-line type electron gun 8 side of the perforated surface 5 </ b> U of the shadow mask 5 in the second stage. The shift in direction allows offsetting. If the configuration of the spring 9 composed of two metal springs is appropriately selected as described later, the transition state (shift) of the orbital position of the electron beam 12 due to the thermal expansion of the shadow mask 5 and the support frame 6 as a whole. Is suppressed.

Next, FIGS. 4A to 4C are structural diagrams showing various structural examples of the spring used in the color cathode ray tube having the shadow mask of the present embodiment shown in FIG. (A) shows an example in which the correction amount is relatively small, (b) shows an example in which the correction amount is medium, and (c) shows an example in which the correction amount is relatively large.

In FIGS. 4A to 4C, 9 (1)
Is a first metal spring, 9 (2) is a second metal spring, 9C is a coupling portion, and other components that are the same as those shown in FIG. 1 are denoted by the same reference numerals.

The spring 9 has a first metal spring 9 having a linear portion, a bent portion, and a connecting portion.
(1) and a second metal spring 9 (2),
Metal spring 9 (1) and second metal spring 9 (2)
Are connected to each other to form a connecting portion 5C. The connecting portion 5C as a whole is formed in a substantially V-shape.

In this case, as shown in FIG.
The first metal spring 9 (2) is configured such that the length of the bent portion of the second metal spring 9 (2) is longer than that of the bent portion of the first metal spring 9 (1), that is, a <b. Attach the other end of the spring 9 (1) to the stud pin 10 and
If the other end of the metal spring 9 (2) is attached to the outer periphery of the support frame 6, the spring 5 moves the perforated surface 5U of the shadow mask 5 toward the in-line type electron gun 8 in the second stage, ie, Thus, the spring 5 having a relatively small function of correcting the doming phenomenon in the second stage can be obtained.

Further, as shown in FIG.
The length of the bent portion of the metal spring 9 (1) and the length of the bent portion of the second metal spring 9 (2) are substantially equal, that is, the first metal spring 9 (2) is configured so that a = b.
If the other end of (1) is attached to the stud pin 10 and the other end of the second metal spring 9 (2) is attached to the outer periphery of the support frame 6, the shadow mask 5 in the second stage by the spring 5 is provided. The transition state of the hole surface 5U toward the in-line type electron gun 8, that is, the spring 5 having a moderate function of correcting the second stage doming phenomenon can be obtained.

Further, as shown in FIG. 4C, the length of the bent portion of the second metal spring 9 (2) is shorter than the length of the bent portion of the first metal spring 9 (1). ,
That is, the configuration is such that a> b, the other end of the first metal spring 9 (1) is attached to the stud pin 10, and the other end of the second metal spring 9 (2) is attached to the outer periphery of the support frame 6. When the spring 5 is attached, the spring 5 has a relatively large function of correcting the doping phenomenon in the second stage, that is, the state in which the perforated surface 5U of the shadow mask 5 is moved toward the in-line type electron gun 8 in the second stage. Can be obtained.

As described above, according to the color cathode ray tube having the shadow mask of the present embodiment, the spring 9 for attaching the support frame 6 to the inside of the panel portion 1 is replaced by the two metal springs 9 (1), 9 Two metal springs 9 (1) and 9 (2) are used by connecting one end of (2) in a V-shape.
Since the support frame 6 is attached to the inside of the panel section 1 with the connecting portion 9C side of the device facing the in-line electron gun 8, the first-stage doming phenomenon is larger than the second-stage doming phenomenon. Even in this case, when the support frame 6 thermally expands, the support frame 6 is caused to move away from the fluorescent screen 4 by the spring 9, and the first
It is possible to suppress the doming phenomenon at the stage, and to suppress the occurrence of the doming phenomenon as a whole.

The two metal springs 9 (1) and 9 (2) in the above embodiment may be of the same type or different types (so-called bimetals).

[0045]

As described above, according to the present invention, as the spring for attaching the support frame to the panel portion,
Since one end of the two metal springs is connected in a V-shape and the connection side of the two metal springs faces the electron gun, the support frame is attached to the panel. The second-stage doming phenomenon, ie, the first-stage doming phenomenon, ie, the fluorescence in the first stage, compared with the outward transition of the orbital position of the electron beam irradiating the phosphor screen in the second stage. Even when the position of the electron beam trajectory irradiating the surface is largely displaced toward the center, when the support frame thermally expands, such a spring arrangement keeps the support frame away from the phosphor screen. It is possible to suppress the large first-stage doming phenomenon, suppress the occurrence of the doming phenomenon as a whole, and eliminate the occurrence of color shift in the displayed image. There is an effect that.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a schematic configuration of an embodiment of a color cathode ray tube having a shadow mask according to the present invention.

FIG. 2 is a partially enlarged cross-sectional view showing a state in which a support frame is mounted in a panel portion of the color cathode ray tube having the shadow mask shown in FIG.

FIG. 3 is an explanatory view showing a moving state of an electron beam trajectory due to thermal expansion of a shadow mask or the like in a color cathode ray tube having the shadow mask shown in FIG.

FIG. 4 is a configuration diagram showing a configuration example of various springs used in a color cathode ray tube having the shadow mask shown in FIG. 1;

FIG. 5 is a partially enlarged cross-sectional view showing a state in which a support frame is mounted in a panel portion in a color cathode ray tube having a known shadow mask.

FIG. 6 is an explanatory diagram showing a moving state of an electron beam trajectory due to thermal expansion of a shadow mask or the like in a color cathode ray tube having the known shadow mask shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Panel part 1F Face plate 2 Neck part 3 Funnel part 4 Fluorescent surface 5 Shadow mask 5H Electron beam passage hole 5U Perforated surface 5S Skirt part 6 Support frame 7 Deflection yoke 8 In-line type electron gun 9 Spring 9 (1) 1st Metal spring 9 (2) Second metal spring 9C Joint 10 Stud pin 11 Adjustment magnet 12 Electron beam

Claims (1)

[Claims] 1. A fluorescent surface attached to an inner surface of a face plate of a panel portion, a shadow mask disposed to face the fluorescent surface and attached to the panel portion by holding a support frame, and housed in a neck portion. In the color cathode ray tube including the electron gun and the deflection yoke mounted on the outer periphery of the funnel portion, two metal springs are used as springs for mounting the support frame holding the shadow mask in the panel portion. The other end of each of the two metal springs is connected to the inside of the panel section and the support with the two metal springs having one end connected in a V-shape with the connection side of the two metal springs facing the electron gun. A color cathode ray tube provided with a shadow mask fixed to a frame.