JPH08171865A - Color picture tube - Google Patents

Abstract

PURPOSE: To provide a color picture tube for stably display a good image by forming an elastic supporting body for supporting a shadow mask into such a shape as not to easily generate the lighting deviation in relation to the external impact. CONSTITUTION: A color picture tube is formed by being supported by a stud pin 30 by which a shadow mask 9 is provided on the corner part of a skirt part 2 of a panel 3, a fixed part 22 fixed on the corner part of a mask frame 8, and an elastic supporting body 31 composed of a locking part 33 to be locked on the stud pin, and inclined parts 35a, 35b inclined to the fixed part and the locked part, and formed into an approximately wedged shape or an approximately V shape. Projecting parts 37a, 37b are provided on the inclined parts 35a, 35b of this elastic supporting body 31.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube, and more particularly to a color picture tube in which an elastic support for supporting a shadow mask has a shape that is unlikely to cause a landing shift due to an external impact or the like.

[0002]

2. Description of the Related Art Generally, as shown in FIG. 7, a color picture tube is joined to a skirt portion 2 and a substantially rectangular panel 3 having a skirt portion 2 provided on the periphery of a curved effective surface 1. It has an envelope composed of a funnel-shaped funnel 4 and faces a phosphor screen 5 made of a three-color phosphor layer formed on the inner surface of the effective surface 1 of the panel 3 and has a large number of electrons inside thereof. A shadow mask 9 composed of a substantially rectangular mask body 7 having a curved surface with a beam passage hole 6 and a substantially rectangular mask frame 8 attached to the peripheral portion of the mask body 7 is arranged. On the other hand, in the neck 10 of the funnel 4, an electron gun 12 that emits the three electron beams 11 is arranged. Then, the three electron beam 11 emitted from the electron gun 12 is deflected by the magnetic field generated by the deflection device 13 mounted outside the funnel 4,
Level the phosphor screen 5 through the shadow mask 9,
It is formed so as to display a color image by performing vertical scanning.

As a method of supporting the shadow mask 8,
A substantially wedge-shaped elastic support 15a is attached to each corner of the mask frame 8, and the elastic support 15a is attached to the panel 3.
There is one that is detachably supported by being locked to a stud pin 16 provided at each corner portion of the skirt portion 2. The elastic support body 15a includes a fixing portion 17 fixed to the mask frame 8, a locking portion 18 locking the stud pin 16, and an inclined portion 19 slantingly connected to the fixing portion 17 and the locking portion 18. Become.

Generally, in order to display an image without color shift on a phosphor screen of a color picture tube, an electron beam passing through an electron beam passage hole formed in a mask body of a shadow mask is used as a phosphor screen. It is necessary to ensure proper landing on each of the color phosphor layers. For that purpose, it is necessary to maintain the positional relationship between the panel and the shadow mask, in particular, the distance (q value) between the inner surface of the panel on which the phosphor screen is formed and the mask body of the shadow mask within a predetermined allowable range. .

However, the mask body of the shadow mask is usually formed of a thin carbon steel plate, and the amount of the electron beam that reaches the phosphor screen through the electron beam passage hole of the mask body is emitted from the electron gun. It is 1/3 or less of the electron beam, and most of the electron beam strikes the shadow mask. Therefore, the shadow mask is heated and thermally expanded, and in particular, the mask main body having a thin curved surface causes doming (deformation) of bulging toward the phosphor screen side. If the amount of bulging due to this doming exceeds the above-mentioned q value, the landing of the electron beam on the three-color phosphor layer is deviated, causing color misregistration. The magnitude of the landing displacement due to the thermal expansion of the shadow mask varies depending on the amount of electron beam current, the size of the image pattern, the duration of the image pattern, and the like.

Of the landing deviation due to the thermal expansion of the shadow mask, the mask main body having a smaller thickness than the mask frame is heated at the beginning of the operation of the color picture tube, and the heat of the heated mask main body is transferred to the mask frame. Thus, the mask body and the mask frame are in a substantially thermal equilibrium state, and the landing displacement during long-time operation caused by thermal expansion of the mask frame together with the mask body can be effectively corrected by the substantially wedge-shaped elastic support member 15a. You can That is, the substantially wedge-shaped elastic support 1
As indicated by the alternate long and short dash line in FIG. 7B, 5a pushes up the mask body 7 toward the phosphor screen 5 along with the thermal expansion of the mask frame 8 and passes through the electron beam passage hole 6 of the mask body 7. The trajectory of the electron beam 11 landing on the three-color phosphor layer is corrected so as not to change before and after the thermal expansion of the shadow mask 9.

On the other hand, for large color picture tubes at present,
Instead of the carbon steel plate, a mask body made of amber material having a small thermal expansion coefficient is used. As shown in FIG. 8, in the color picture tube in which the mask main body is formed of a material having a small thermal expansion coefficient and the thermal expansion coefficient of the mask frame is different from that of the mask frame, as shown in FIG. The inclined portions 19a and 19b are formed by bending the fixed portion 17 to be fixed and the one end portion of the locking portion 18 to be locked to the stud pin 16 provided on the skirt portion 2 of the panel 3, respectively. , 19b are welded to each other to attach the elastic supports 15b formed in a substantially V shape to the corners of the mask frame 8, and the locking portions 18 are attached to the skirt portion 2 of the panel 3.
The shadow mask 9 is supported by being locked to the stud pins 16 provided at the corners of the shadow mask 9.

Such an elastic support member 15b, as shown by the alternate long and short dash line in FIG. 8, has the same thermal expansion effect on the mask frame 8 as the substantially wedge-shaped elastic support member 15a shown in FIG. 7B. Along with this, the trajectory of the electron beam 11 that pushes up the mask body 7 toward the phosphor screen 5 and passes through the electron beam passage hole 6 of the mask body 7 to land the three-color phosphor layer is the same as before the thermal expansion of the shadow mask 9. Correct so that it does not change after thermal expansion.

By the way, as the elastic supports 15a and 15b for supporting the shadow mask 9 of the color picture tube, in addition to the landing deviation correction of the electron beam 11 due to the thermal expansion of the shadow mask 9 described above, the color picture tube manufacturing process ( Mainly maintaining the detachability of the shadow mask in the phosphor screen forming step), landing displacement caused by changing the locking state of the elastic support with respect to the stud pin due to an external impact, during operation of the TV set,
It is required to have a characteristic that suppresses landing displacement (howling) caused by the resonance of the mask body due to the voice of the speaker.

[0010]

As described above, as a method of supporting a shadow mask in which the mask main body of the color picture tube is made of carbon steel plate, elastic supports are attached to the respective corners of the mask frame, and the elastic supports are A stud pin provided at each corner of the skirt of the panel supports the elastic support by locking it to the mask frame, a locking part that locks to the stud pin, and these fixings. There is a substantially wedge-shaped one that is composed of a portion and an inclined portion that is inclined and connected to the locking portion. Further, as a method of supporting a shadow mask whose mask main body is made of amber material having a small coefficient of thermal expansion, elastic supports attached to the respective corners of the mask frame are provided on a fixing part fixed to the mask frame and a skirt part of the panel. There is one in which an inclined portion is bent and formed on each one end side of an engaging portion that engages with the stud pin, and these inclined portions are welded into a substantially V-shape.

When the shadow mask is supported by attaching the substantially wedge-shaped or V-shaped elastic supports to the respective corners of the mask frame, the mask heated by the collision of the electron beam during the operation of the color picture tube. The heat of the main body is transferred to the mask frame, the mask main body and the mask frame are in a substantially thermal equilibrium state, and the landing deviation of the electron beam during long-time operation caused by thermal expansion of the mask main body and the mask main body is effectively corrected. be able to.

However, for the main purpose of correcting the landing deviation of the electron beam during long-time operation caused by thermal expansion of the mask main body and the mask frame in thermal equilibrium with the mask main body, a substantially wedge shape or The design of the substantially V-shaped elastic support not only corrects the landing shift of the electron beam due to the above-mentioned thermal expansion, but also keeps the required characteristics, that is, the detachability of the shadow mask in the manufacturing process of the color picture tube, in good condition. A characteristic is obtained that suppresses the landing displacement caused by the change in the state of the elastic support member being locked to the stud pin due to the impact, and the landing displacement caused by the mask body resonating due to the sound of the speaker during the operation of the TV set. There may be no. In particular, it tends to appear when the shadow mask is supported by a horizontally long color picture tube having an aspect ratio of 16: 9 and a substantially V-shaped elastic support.

In a horizontally long color picture tube having an aspect ratio of 16: 9, the short axis (Y axis) of the shadow mask 8 (which coincides with the vertical axis of the screen) as shown in FIG. The center O of the shadow mask 8 and the mask frame 8
The angle .theta.2 formed by the line 21 connecting the elastic support 15 attached to the corner of the screen has an aspect ratio of 4: 3.
This is because it is about 55 ° in a normal color picture tube of, but it is larger than that.

That is, the aspect ratio of the screen is 16: 9.
In a horizontally long color picture tube, the shadow mask 8
Elastic support 15 (15a or 15b) at the corner of
When the shadow mask 8 is supported by attaching the elastic support 15 to the stud pins 16 provided at the corners of the skirt of the panel 3, the spring constant of the elastic support 15 is k, and the elastic support is The bending amount of 15 is x, the spring constant in the bending direction is k1, the spring constant in the direction orthogonal to the bending direction is k2, and the angle formed by the bending direction with respect to the major axis direction is θ1.
Then, the force F in the major axis (X axis) direction applied to the elastic support member 15 is represented by F = kx1 = (k1 cos θ1 + k2 sin θ1) x. Normally, the substantially wedge-shaped and substantially V-shaped elastic supports 15 have k2 >> k1, so that the force F in the longitudinal direction applied to the elastic supports 15 is F.
Is smaller in a horizontally long color picture tube having a screen aspect ratio of 16: 9 than in a normal color picture tube having a screen aspect ratio of 4: 3.

Therefore, the aspect ratio of the screen is 16:
The horizontal color picture tube of 9 has a screen aspect ratio of 4:
When external vibration, for example, is applied as compared with the normal color picture tube of No. 3, the amount of vibration in the long axis direction of the elastic support 15 increases, which causes color shift of the entire screen. Further, when an impact is applied in a horizontal direction perpendicular to the tube axis and the minor axis, the engagement state of the elastic support body 15 with respect to the stud pin changes, which causes a landing deviation. Further, the substantially V-shaped elastic support member 15 is mechanically weak against an impact in the tube axis direction because the inclined portion is a pair.

In order to increase the force F in the major axis direction applied to the elastic support member 15, for example, the plate thickness of the elastic support member 15 may be increased. However, the change of the plate thickness is required for a long time of the color picture tube. It may not be possible to change it due to the landing deviation correction during operation. If the plate thickness is increased, k1
Becomes too large, which deteriorates the detachability of the shadow mask in the color picture tube manufacturing process.

As a method of increasing the force of F = kx1, increasing x1 can be considered. To increase this x1, for example, a substantially wedge shape or substantially V
The opening angle of the locking portion with respect to the fixed portion when the V-shaped elastic support body is not locked to the stud pin may be increased, but such elastic support body 15 is advantageous for the detachability of the shadow mask. However, it has almost no effect on external impact.

The present invention has been made in view of the above problems, and in a color picture tube in which a shadow mask is supported by a substantially wedge-shaped or substantially V-shaped elastic support, a landing displacement due to thermal expansion of the shadow mask. Effectively, and at the same time keep the detachability of the shadow mask good in the color picture tube manufacturing process, and the landing deviation caused by the change of the locking state of the elastic support to the stud pin due to external impact, the operation of the TV set. In this case, the object is to have a characteristic that suppresses the landing shift caused by the resonance of the mask body due to the voice of the speaker.

[0019]

A mask body having a large number of electron beam passage holes facing a phosphor screen formed on the inner surface of a substantially rectangular panel having a skirt portion on the periphery thereof. A shadow mask consisting of a substantially rectangular mask frame attached to the periphery of the mask body is arranged, and the shadow mask is fixed to the stud pin provided at the corner of the skirt of the panel and the corner of the mask frame. Supported by a substantially wedge-shaped or substantially V-shaped elastic support member including a fixed portion, a locking portion that locks to the stud pin, and an inclined portion that is inclined with respect to the fixed portion and the locking portion. In the color picture tube, the protrusion is provided on the inclined portion of the elastic support.

[0020]

As described above, when the protruding portion is provided on the inclined portion of the substantially wedge-shaped or substantially V-shaped elastic support member that supports the shadow mask, the color picture tube caused by the thermal expansion of the mask frame together with the mask body. Even if the elastic support is designed so as to almost completely correct the landing displacement during long-time operation, the detachment of the shadow mask in the color picture tube manufacturing process is not impaired, and the elastic support of the elastic support to the stud pin is not affected by external impact. Effectively suppresses landing deviations caused by changes in the locked state and landing deviations caused by the mask body resonating due to the sound of the speaker when the TV set is operating, and a good image is displayed stably. It can be a color picture tube.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 shows a color picture tube which is one of the embodiments. This color picture tube has a substantially rectangular panel 3 in which a skirt portion 2 is provided in the peripheral portion of a curved effective surface 1.
And funnel-shaped funnel 4 joined to the skirt 2
A phosphor screen 5 having a three-color phosphor layer that emits blue, green, and red is formed on the inner surface of the effective surface 1 of the panel 3 described above. A substantially rectangular mask body 7 having a curved surface on which a large number of electron beam passage holes 6 are formed facing each other, and a substantially rectangular mask frame having an L-shaped cross section attached to the peripheral portion of the mask body 7. A shadow mask 9 composed of 8 is supported by a mask supporting means described later. on the other hand,
An electron gun 12 that emits a three-electron beam 11 is arranged in the neck 10 of the funnel 4. Then, the three electron beams 11 emitted from the electron gun 12 are deflected by the magnetic field generated by the deflecting device 13 mounted outside the funnel 4, and the phosphor screen 5 is horizontally and vertically scanned through the shadow mask 9. As a result, a structure for displaying a color image is formed.

The mask support means is provided with stud pins 3 provided on the inner surface of each corner of the skirt portion 2 of the panel 3.
0, and an elastic support 31 fixed to the side surface of each corner of the mask frame 8 and detachably locked to the stud pin 30. The elastic support 31 is shown in FIG.
As shown in FIG. 2 and FIG. 2, one end side of the fixing portion 32 fixed to the mask frame 8 and the locking portion 34 in which the locking hole 33 for locking the stud pin 30 is formed is bent to form an inclined portion. 35a and 35b are provided, and these inclined portions 35
The respective end portions of a and 35b are welded at the welding points indicated by X to form a substantially V-shaped structure.

Further, with respect to the elastic support member 31, a projecting portion 37 which crosses the inclined portions 35a and 35b in the width direction thereof is provided.
a and 37b are formed respectively. In particular, in the elastic support 31 of this example, among the protrusions 37a and 37b, the inclined portion 35a on the side of the fixed portion 32 fixed to the mask frame 8 has a protrusion 37a protruding inward of the elastic support 31. However, a protruding portion 37 a that protrudes to the outside of the elastic support body 31 is formed on the inclined portion 35 b on the locking portion 34 side that locks to the stud pin 30.

When the elastic support 31 is formed in such a structure, the spring constant in the bending direction of the elastic support described above with reference to FIG. 9 is increased in the direction perpendicular to the bending direction without increasing k1 too much. The spring constant of can be increased by k2, and the force F = kx1 applied to the elastic support in the major axis (X axis) direction can be increased.

Therefore, when the elastic support 31 is constructed as described above, the mask body 7 is caused by the collision of the electron beam 11.
Is heated, the heat of the heated mask body 7 is transferred to the mask frame 8, the mask body 7 and the mask frame 8 are in a substantially thermal equilibrium state, and the mask frame 8 and the mask frame 8 are thermally expanded. Even if the elastic support is designed for the purpose of correcting the landing shift of the electron beam with respect to the three-color phosphor layer that occurs during long-term operation, even if the landing shift of the electron beam due to the thermal expansion of the shadow mask 8 is corrected, Keeping the detachability of the shadow mask 8 good in the process of manufacturing the picture tube, changing the locking state of the elastic support body with respect to the stud pin 30 due to an external impact causes a landing displacement, a TV set operation, a speaker sound, etc. Equipped with the property of suppressing the landing shift caused by the resonance of the mask body 7. Can be a desired elastic support, the quality good image can be a color picture tube according to stably displayed.

Next, an elastic support having a structure different from that of the elastic support will be described.

The elastic support shown in FIG. 3 is similar to the elastic support of the above-described embodiment shown in FIG. 2, and has one end of a fixing portion 32 fixed to the mask frame and a locking portion 33 for locking the stud pin. The parts are bent so that the inclined parts 35a, 35
b, and the inclined portions 35a and 35b of the substantially V-shaped elastic support body 31 formed by welding the respective end portions of the inclined portions 35a and 35b to the protrusions protruding outside the elastic support body 31 respectively. The parts 37a and 37b are formed.

Further, the elastic support shown in FIG. 4 is similar to each inclined portion 35 of the elastic support 31 formed in a substantially V shape.
Protrusions 37a and 37b protruding outward from the elastic support 31 are formed at the central portions of a and 35b, respectively, and
A protruding portion 38 that also protrudes outside the elastic support body 31 is provided at a position near the inclined portion 35b of the locking portion 34.

Further, the elastic support shown in FIG. 5 has the inclined portions 35 of the elastic support 31 which are similarly formed in a substantially V shape.
Each of a and 35b is provided with a pair of vertically elongated protrusions 37a and 37b protruding outside the elastic support member 31.

As shown in FIGS. 3 to 5, even if the elastic support member 33 is constructed, a color picture tube having the same effect as that of the embodiment shown in FIG. 2 can be constructed.

In the elastic support shown in FIG. 6, one end of the locking portion 34 for locking the stud pin is bent to form an inclined portion 35, and one end of the inclined portion 35 is fixed to the mask frame. The protruding portion 37 protruding outward is formed on the inclined portion 35 of the elastic support body 31 formed into a substantially wedge shape by welding to the fixed portion 32.

Even if the protrusion 37 is formed on the inclined portion 35 of the elastic support 31 formed in a substantially wedge shape as described above, the landing deviation of the electron beam during long-time operation due to thermal expansion of the shadow mask is corrected, and Keeping the detachability of the shadow mask good in the process of manufacturing color picture tubes, the masking is caused by the landing displacement caused by the change of the state of the elastic support body locking to the stud pin due to an external impact, the sound of the speaker during the operation of the TV set, etc. The desired elastic support can be provided with the property of suppressing the landing displacement caused by the resonance of the main body, and the color picture tube that can stably display an image of good quality can be obtained.

In each of the elastic supports shown in FIGS. 3 to 6, projections are formed so as to project to the outside of the elastic support. However, at least a part of these projections is inside the elastic support. It may be configured so as to project into the.

[0035]

EFFECTS OF THE INVENTION A mask main body having a large number of electron beam passing holes and a mask main body facing the phosphor screen formed on the inner surface of a substantially rectangular panel having a skirt portion on the periphery thereof. A shadow mask consisting of a substantially rectangular mask frame attached to the peripheral portion is arranged, and this shadow mask is provided with a stud pin provided at a corner portion of the skirt portion of the panel and a fixing portion fixed to the corner portion of the mask frame. A collar that is detachably supported by a substantially wedge-shaped or substantially V-shaped elastic support body that includes a locking portion that locks to the stud pin and an inclined portion that is inclined with respect to the fixing portion and the locking portion. In the picture tube, when the protrusion is provided on the inclined portion of the elastic support,
Even if the elastic support is designed so as to almost completely correct the landing deviation during long-term operation of the color picture tube caused by thermal expansion of the mask frame together with the mask body,
The main body of the mask is not affected by the impact of detaching the shadow mask in the color picture tube manufacturing process, and the landing shift caused by the change of the state of the elastic support body with respect to the stud pin due to an external impact, the operation of the TV set, the sound of the speaker, etc. It is possible to provide a color picture tube that suppresses a landing shift and the like caused by the resonance of the, and stably displays an image of good quality.

[Brief description of drawings]

FIG. 1 (a) is an embodiment of the present invention, which is approximately V
FIG. 1 is a diagram showing a configuration of a color picture tube in which a shadow mask is supported by a character-shaped elastic support, and FIG. 1B is a diagram showing a configuration of a main part thereof.

2 (a) is a front view showing the structure of a substantially V-shaped elastic support of the color picture tube shown in FIG. 1, FIG.
(B) is the side view.

3 (a) is a front view showing the structure of an elastic support having a substantially V shape different from that of the elastic support shown in FIG. 2;
FIG. 3B is a side view thereof.

4 (a) is a front view showing the structure of an elastic support having a substantially V-shape, which is different from the elastic support shown in FIG. 2, and FIG. 4 (b) is a side view thereof.

5 (a) is a front view showing the structure of another V-shaped elastic support different from the elastic support shown in FIG. 2;
FIG. 5B is a side view thereof.

FIG. 6 (a) is a front view showing the structure of a substantially wedge-shaped elastic support, and FIG. 6 (b) is a side view thereof.

FIG. 7 (a) is a diagram showing a configuration of a color picture tube in which a shadow mask is supported by a conventional substantially wedge-shaped elastic support, and FIG. 7 (b) is a diagram showing a configuration of a main part thereof.

FIG. 8 is a diagram showing a main part configuration of a color picture tube in which a shadow mask is supported by a conventional substantially V-shaped elastic support member.

FIG. 9 is a diagram for explaining a problem of a conventional elastic support body.

[Explanation of Codes] 2 ... Skirt part 3 ... Panel 5 ... Phosphor screen 6 ... Electron beam passing hole 7 ... Mask body 8 ... Mask frame 9 ... Shadow mask 30 ... Stud pin 31 ... Elastic support 32 ... Fixing part 33 ... Locking part 35 ... Inclined part 35a, 35b ... Inclined part 37 ... Projection part 37a, 37b ... Projection part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kazunori Nakane 1-9-2 Harara-cho, Fukaya-shi, Saitama Stock company Toshiba Fukaya electronics factory

Claims (1)

[Claims] 1. A mask main body having a large number of electron beam passage holes formed opposite to a phosphor screen formed on the inner surface of a substantially rectangular panel having a skirt portion on the peripheral portion, and a mask main body of the mask main body. A substantially rectangular shadow mask consisting of a substantially rectangular mask frame attached to the peripheral portion is arranged, and the shadow mask is provided with a stud pin provided at a corner portion of the skirt portion of the panel and a corner portion of the mask frame. Supported by a substantially wedge-shaped or substantially V-shaped elastic support member including a fixed portion fixed to the stud pin, a locking portion for locking the stud pin, and an inclined portion inclined with respect to the fixed portion and the locking portion. In the color picture tube as described above, the elastic support body is provided with a protrusion on the inclined portion.