JPH11317180A - Cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cathode-ray tube having a limited number of supporting members placed efficiently, while sufficiently keeping reliability of strength of atmospheric pressure resistance of a vacuum enclosure. SOLUTION: A vacuum enclosure is equipped with a rectangular and flat face plate, and a rectangular and flat rear plate 3 placed opposite to the face plate via a side wall 2, and plural supporting members S to support atmospheric pressure are provided between the face plate and the rear plate. Each supporting member has an abutting surface abutting on the inner surface of the face plate, and an abutting surface to abut on a part where a stress value applied on the face plate is big is formed so as to have a larger area in comparison with other supporting members.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube which emits an electron beam from a plurality of electron-emitting portions to form an image on a phosphor screen formed on the inner surface of a flat face plate. The present invention relates to a cathode ray tube device provided with a support member for supporting the atmospheric pressure applied to a face plate and a flat rear plate.

[0002]

2. Description of the Related Art In recent years, there has been a demand for a high-definition cathode-ray tube for high-definition broadcasting or a large screen accompanying it, and its screen display performance is required to be even more severe. In order to achieve these demands, it is necessary to flatten the screen surface and increase the resolution, and at the same time, it is necessary to reduce the weight and thickness.

As a cathode ray tube satisfying the above demand, Japanese Patent Application Laid-Open No. 5-36363 discloses a plurality of electron guns in which a face plate is flattened and a phosphor screen of an integral structure formed on an inner surface of the face plate is provided. There is shown a cathode ray tube in which a phosphor screen is divided into a plurality of regions and scanned by deflecting an electron beam emitted from a plurality of deflecting devices.

[0004] In this cathode ray tube, a flat face plate and a flat rear plate opposed to each other via a side wall, a plurality of funnels joined around a plurality of openings formed in the rear plate, and A vacuum envelope having A phosphor screen having an integrated structure is formed on the inner surface of the face plate. In addition, a deflection device is mounted outside each funnel,
An electron gun is provided in the neck of each funnel.

According to the cathode ray tube having the above structure, the electron beam emitted from each electron gun is deflected by the magnetic field generated by the corresponding deflecting device to divide the phosphor screen into a plurality of corresponding areas. Scan. The image drawn on the phosphor screen by the divided scanning is connected by a signal applied to the electron gun or the deflection device, and reproduces one large image with no break or overlap on the entire surface of the phosphor screen.

According to the cathode ray tube having the above structure, it is possible to achieve a light weight, a thin thickness, and a flat screen surface. In addition, the distance from the electron gun to the phosphor screen is reduced due to the reduction in thickness, and the magnification of the electron lens can be reduced. As a result, the spot diameter of the electron beam on the phosphor screen is reduced, and higher resolution can be achieved.

In the above-mentioned cathode ray tube, a plurality of support members are arranged between the face plate and the rear plate in order to support the atmospheric load applied to the vacuum envelope. The base end of each support member is fixed to the rear plate using a method such as sealing with frit glass or laser welding, and the front end is processed into a wedge shape to abut the black light absorbing layer of the phosphor screen. .

Conventionally, such support members are arranged at regular intervals at the corners of the boundaries between the divided regions of the phosphor screen and at the vertical boundaries. By arranging the support member in such a manner, when the phosphor screen is divided and scanned, the electron beam does not hit the support member, and the tip of the support member is placed on the non-light-emitting black light absorbing layer of the phosphor screen. Because of the contact, when the image is reproduced, the support member is not seen from the front side of the phosphor screen.

[0009]

In a cathode ray tube having a structure in which a supporting member is arranged in such a vacuum envelope to support an atmospheric pressure load, the atmospheric pressure resistance increases as the number of supporting members arranged increases. And the reliability is improved.

However, if the number of support members is excessively increased, cost increases due to an increase in the number of parts are unavoidable, and the rate of occurrence of defects during mass production is increased to lower the yield. As a result, the yield is further reduced. The cost may increase. Therefore, the number of supporting members needs to be suppressed to an appropriate number in consideration of atmospheric pressure resistance, manufacturing cost, productivity, and the like.

However, on the other hand, when the number of support members is reduced, the portion of the face plate near the tip of the support member in contact with the support member is at least twice as large as the portion between the support members. Concentrated stress acts, and the atmospheric pressure resistance in this portion is weakened. When an external force is applied near the end of the support member, the face plate may be easily deformed or broken.

The present invention has been made in view of the above points, and an object thereof is to efficiently arrange a small number of support members while sufficiently maintaining the reliability of the atmospheric pressure resistance of a vacuum envelope. It is an object of the present invention to provide a cathode ray tube.

[0013]

In order to achieve the above object, a cathode ray tube according to the present invention comprises a substantially rectangular flat face plate and a substantially rectangular face plate provided opposite to the face plate. A flat rear plate,
A vacuum envelope provided with a phosphor screen formed on the inner surface of the face plate, an electron emission unit provided on the rear plate, and emitting electrons toward the phosphor screen, and the face plate; A plurality of support members disposed between the rear plate and supporting the atmospheric pressure applied to the face plate and the rear plate,
Reinforcing means for reinforcing a portion of the face plate with which the support member abuts.

According to the cathode ray tube having the above structure, the face plate near the tip of the support member in contact with the support member has:
Compared to the face plate portion located between the support members, the concentrated stress is applied at least twice or more, and the atmospheric pressure resistance is lower than the other portions. Therefore, when an external force is applied to this part of the face plate,
The vacuum envelope can easily be deformed or broken. Since the destruction occurs from the portion where the stress value is the largest, and the portion that is weak to external force is also the portion where the stress value is the largest, the portion where the tip of the support member contacts the phosphor screen is strengthened by the reinforcing means. The reinforcement can support the generated stress and increase the atmospheric pressure resistance.

In another cathode ray tube according to the present invention, a substantially rectangular flat face plate, a substantially rectangular flat rear plate provided to face the face plate, and A vacuum envelope provided with a phosphor screen formed on the inner surface of the face plate, an electron emission unit provided on the rear plate and emitting electrons toward the phosphor screen, the face plate and the A plurality of support members disposed between the rear plate and having a contact surface respectively in contact with the face plate, and supporting a plurality of atmospheric pressures applied to the face plate and the rear plate, The plurality of support members are provided with contact surfaces having different areas depending on the arrangement position.

According to the cathode ray tube having the above-described structure, concentrated stress is generated at a portion where the supporting member is in contact with the face plate and the rear plate. It is not uniform in position, but it is different.

For example, when the supporting members are arranged at equal intervals in the vertical and horizontal directions of the face plate, the distance between the side wall of the vacuum envelope and the supporting member closest to the side wall is larger than the distance between the supporting members. When it is large, the stress acting on the face plate becomes maximum at the position of the support member provided at the corner portion, and gradually decreases as the distance from the support member increases. Further, when the distance between the side wall of the vacuum envelope and the supporting member closest to the side wall is smaller than the distance between the supporting members, the stress acting on the face plate is one more than that of the supporting member located at the corner. It becomes largest at the portion of the support member located on the inner side, and gradually decreases as the distance from the support member increases.

In any case, the destruction of the vacuum envelope occurs from the portion having the largest stress value, and the portion weak to the external force is also the portion having the largest stress value. By increasing the contact area of the surrounding support members, the stress acting on the face plate can be dispersed, and the atmospheric pressure resistance can be increased. In addition, for other portions where the stress value is small, by using a support member having a small contact area, it is possible to reduce the amount of use of the entire support member.

Further, another cathode ray tube according to the present invention includes a substantially rectangular flat face plate, a substantially rectangular flat rear plate provided opposite to the face plate, and A vacuum envelope provided with a phosphor screen formed on the inner surface of the face plate, an electron emission unit provided on the rear plate and emitting electrons toward the phosphor screen, the face plate and the A plurality of support members disposed between the rear plate and the face plate and supporting the atmospheric pressure applied to the rear plate, wherein the plurality of support members are arranged in a plurality of substantially parallel rows substantially equidistant from each other. And the support members in the above-mentioned row are arranged at plural kinds of intervals.

According to the cathode ray tube having the above-described structure, the breakage of the vacuum envelope occurs from the portion where the stress value is the largest, and the portion weak to the external force is also the portion where the stress value is the largest. By making the arrangement of the support members in this portion slightly denser and reducing the number of support members in the portion having a small stress value, it is possible to reduce the maximum stress value and reduce the total number of support members.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a cathode ray tube according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIGS. 1 and 3, the cathode ray tube is a vacuum envelope 10.
It has. The vacuum envelope 10 includes a face plate 1 made of substantially rectangular flat glass, and glass joined to a peripheral portion of the face plate 1 by frit glass and extending substantially perpendicular to the face plate. A frame-shaped side wall 2, a rear plate 3 made of substantially rectangular flat glass joined to the side wall 2 by frit glass and facing in parallel with the face plate 1, and a plurality of openings formed in the rear plate 3. And a plurality of funnels 5 made of glass joined by frit glass around the hole 4. In the illustrated example, a total of 20 openings 4 are formed in the rear plate 3 in a matrix form, five in the horizontal direction and four in the vertical direction, and a funnel 5 is joined around each opening 4. .

As shown in FIGS. 2 and 3, on the inner surface of the face plate 1, a phosphor screen 7 having a rectangular shape as a whole is formed. This phosphor screen 7
Are striped black light absorbing layers 8 arranged in parallel at predetermined intervals in the horizontal direction X, and are provided between these black light absorbing layers and extend in the vertical direction Y. And a large number of stripe-shaped phosphor layers that emit light of the three colors B.

In the vacuum envelope 10, a shadow mask 9 having a large number of electron beam passage holes is provided so as to face the phosphor screen 7. Shadow mask 9
Are horizontally divided into five equal parts corresponding to a plurality of divided areas of the phosphor screen 7 described later. Each divided mask is fixed to the inner surface of the rear plate 3 via a plurality of mask erection members 12 in a state where tension is applied in the vertical direction Y.

In the present embodiment, each of the divided areas R1 to R1
The dimension of R20 is 80 mm × 75 mm (corresponding to a 21-inch television), and the distance between the end of the phosphor screen 7 and the side wall 2 required for disposing the mask erection member 12 is 30 mm.

A deflecting device 14 is mounted outside each of the plurality of funnels 5, and an electron emitting portion for emitting an electron beam toward the phosphor screen 7 is provided in a neck 15 of each funnel 5. An electron gun 16 functioning as an electronic gun is provided.

In the cathode ray tube having such a configuration, the electron beams emitted from the plurality of electron guns 16 are deflected by the magnetic fields generated by the corresponding deflecting devices 14, and the fluorescent screen 7 is supported via the shadow mask 9. A plurality of regions, five in the horizontal direction in the example shown, four in the vertical direction,
Scanning is performed by dividing into a total of 20 regions R1 to R20. The images drawn on the phosphor screen 7 by the divided scanning are connected by signals applied to the electron gun 16 and the deflecting device 14 to reproduce one large image with no breaks or overlaps on the front surface of the phosphor screen 7.

As shown in FIGS. 3 to 5, in the above-mentioned cathode ray tube, a plurality of metal plates are provided between the face plate 1 and the rear plate 3 in order to support an atmospheric pressure load applied to the vacuum envelope 10. Are disposed. Each support member S is formed in a prismatic shape, and its tip is formed in a wedge shape. The distal end surface of the support member S forms an elongated rectangular contact surface 18. In addition, each support member S has its base end fixed to the rear plate 3 and stands upright with respect to the rear plate. Then, the plurality of support members S
Is erected in the rear plate 3 at a position facing the corner of the boundary between the divided regions R1 to R20 of the phosphor screen 7.

As shown in FIGS. 6 and 7, in the black light absorbing layer 8 of the phosphor screen 7, at a position facing the contact surface 18 of each support member S, a reinforcing plate functioning as a reinforcing means is provided. 20 is fixed. The reinforcing plate 20 is formed of an elongated rectangular metal plate, and extends in the vertical direction Y. The distal end surface 18 of each support member S extends in the vertical direction Y, and is in contact with the black light absorbing layer 8 of the phosphor screen 7 via the reinforcing plate 20.

When assembling the cathode ray tube having the above structure, the support member S is attached to the vacuum envelope 10 by the following steps. First, as shown in FIG. 5, a fixing plate 22 having a rectangular opening 21 through which the base end of the support member S is inserted is sealed at a predetermined position on the rear plate 3 by frit glass 23.

Next, an annular fixing member 24 is fitted on the outer periphery of the base end of the supporting member S, and the contact surface 18 of the supporting member S is fixed to the phosphor screen 7 using a positioning jig (not shown). And the base end of the support member is inserted through the opening 21 of the fixing plate 22. In this state, the upper surface of the fixing plate 22 and the fixing member 24 and the outer peripheral surface of the base end of the support member S and the fixing member 24 are fixed by welding. Thereby, the support member S
Is fixed in a state where its base end surface is in close contact with the inner surface of the rear plate 3, and is erected perpendicularly to the inner surface of the rear plate 3.

On the other hand, the elongated reinforcing plate 20 fixed on the black light absorbing layer 8 of the phosphor screen 7 is prepared as follows. That is, a metal plate having a thickness of 25 μm is washed with degreasing water, coated with a photosensitive material, and dried. A negative pattern patterned in a predetermined shape is superimposed on the metal plate, and exposed to ultraviolet light to be exposed. After developing this, etching is performed with a ferric chloride solution, and an elongated reinforcing plate 20 is completed. Thereafter, the photosensitive material is peeled off by immersing the reinforcing plate 20 in a peeling liquid.

Each part of the phosphor screen 7 on the black light absorbing layer 8 where the contact surface 18 of the support member S contacts is
A heat resistant ceramic adhesive is applied by a screen printing method. Then, using a positioning jig (not shown), the reinforcing plate 20 is overlaid on the adhesive and fired, so that the reinforcing plate is bonded to the black light absorbing layer 8. Thereafter, the rear plate 3 and the face plate 1 are sealed with frit glass via the side walls 2 to form the vacuum envelope 6, so that the contact surface 18 of each support member S is provided with a corresponding reinforcing plate. The phosphor screen 7 comes into contact with the phosphor screen 7 via the first phosphor screen 20.

In the cathode ray tube configured as described above, the stress acting on the vacuum envelope 10 due to the atmospheric pressure load is applied to the contact surface 18 of the support member S in the face plate 1.
Is the largest. However,
According to the present embodiment, since these portions of the face plate 1 are reinforced by the reinforcing plate 20, the atmospheric pressure resistance of the vacuum envelope 10 can be increased. As a result, the reliability of the cathode ray tube with respect to the atmospheric pressure resistance can be sufficiently maintained, and sufficient strength against external force can be provided.

The reinforcing means is not limited to a metal plate but can be variously selected. For example, as shown in FIG. 8, the contact surface 1 of the support member S in the black light absorbing layer 8 of the phosphor screen 7.
The face plate 1 may be reinforced by the frit glass 26 applied to the position where the glass plate 8 contacts.

In this case, at the time of assembling the cathode ray tube, the frit glass 26 is previously applied to a predetermined position of the black light absorbing layer 8 by using an application jig (not shown), and then the rear plate 3 and the face plate 1 are covered with the side walls. A vacuum envelope 6 is formed by sealing with frit glass. At this time, the frit glass 26 applied on the black light absorbing layer 8 wraps around the tip of the support member S, and both are integrally fixed.

Thus, the contact portion between the face plate 1 where the large stress acts and the supporting member S is reinforced by the frit glass 26, and the atmospheric pressure resistance of the cathode ray tube can be increased. Therefore, similar to the above-described embodiment,
It is possible to sufficiently maintain the reliability of the cathode ray tube with respect to the atmospheric pressure resistance and to have a sufficient strength against an external force.

As the reinforcing means, in addition to the above two examples, for example, a glass plate or a ceramic plate may be used instead of the metal plate, or a heat-resistant adhesive may be used instead of the frit glass 26. You may. Further, when the face plate 1 is manufactured, the face plate may be reinforced so that the thickness of the face plate at the portion where the support member S comes into contact is formed thick in advance.

On the other hand, as described above, the stress acting on the vacuum envelope 10 due to the atmospheric pressure load is greatest at the portion of the face plate 1 near the tip of the support member S, but the magnitude is large. Each position of the member S is not uniform and differs at each position except for the symmetry. That is, in the above-described embodiment, as shown in FIG. 4, the length of the contact surface 18 in the longitudinal direction is the same, for example,
The support members S of 10 mm are arranged at equal intervals at the corners of the boundaries between the divided regions R1 to R20. In this case, a total of 30 support members S are required from S1 to S30, but the largest stress is applied to S7, S9, S2
2, the position of S24, followed by S12, S1
4, the positions of S17 and S19 are large, and the size is S
It is about twice the position of 1 and about 5 times of the position of S3. Therefore, at least the support member S which receives these large stresses
Reinforcing each part of the face plate 1 with which 7, 7, 9, 22 and 24 abuts by the various reinforcing means described above makes it possible to sufficiently improve the atmospheric pressure resistance of the cathode ray tube.

In the embodiment described above, the face plate is reinforced by the reinforcing means to improve the atmospheric pressure resistance of the cathode ray tube. However, the support member S is applied in accordance with the stress distribution generated in the face plate. By changing the area of the contact surface, it is possible to improve the atmospheric pressure resistance of the cathode ray tube.

That is, as described above, concentrated stress is generated at the portion where the support member S is in contact with the face plate 1 and the rear plate 3, but the distribution of the magnitude is different from that of the support member except for the symmetry. It is not uniform in position, but it is different. For example, when the support members S are arranged at equal intervals in the vertical and horizontal directions of the face plate 1, the distance between the side wall of the vacuum envelope and the support member closest to the side wall is larger than the distance between the support members. When it is small, the stress is greatest at the position of the support member one inside the support member located at the corner of the rear plate,
The stress gradually decreases as the distance from the support member increases.

For example, the length of the contact surface 18 in the longitudinal direction is 1
When the support member S of 0 mm is arranged as shown in FIG.
The support members S7, S9, S22, S
24, then the support members S12, S1
4, it becomes larger at the positions of S17 and S19. In this case, by increasing the length in the longitudinal direction of the support members S provided at these positions, that is, by increasing the contact area of the contact surface 18, the face with which these support members contact The stress of each part of the plate 1 can be dispersed, and the atmospheric pressure resistance can be increased.

Therefore, according to the cathode ray tube according to the second embodiment of the present invention, as shown in FIG. 9, 30 support members S1 to S30 are provided at the corners of the boundaries between the divided regions R1 to R20. They are arranged at equal intervals. Each support member S is disposed such that the longitudinal direction of the contact surface 18 coincides with the vertical direction Y. Then, the supporting members S7, S9, S12, S1 provided at positions where a large stress is received among the supporting members.
In 4, S17, S19, S22, and S24, the length of the contact surface 18 in the longitudinal direction is 20 mm, which is twice the length of the contact surface of the other support member, 10 mm. The width of the contact surface 18 is common to all the support members S. Other configurations are the same as those of the above-described embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

With this configuration, the maximum stress acting on the face plate 1 could be reduced by 20%. As a result, it is possible to reduce the cost while sufficiently maintaining the reliability of the cathode ray tube with respect to the atmospheric pressure resistance, and to provide the cathode ray tube with sufficient strength against external force.

FIG. 10 shows the stress distribution between the vacuum envelope having the structure shown in FIG. 4 and the vacuum envelope according to the second embodiment. In FIG. 4
9 shows a stress distribution along a line FF of the vacuum envelope, and a broken line curve b shows a stress distribution along a line HH of the vacuum envelope shown in FIG. As can be seen from this figure, according to the present embodiment, the maximum stress value acting on each position of the vacuum envelope can be reduced.

On the other hand, similarly to the above, in a configuration in which the supporting members S are arranged at equal intervals in the vertical and horizontal directions of the face plate 1, the distance between the side wall of the vacuum envelope and the supporting member closest to the side wall is set. However, when the distance is larger than the distance between the support members, the stress at the position of the support member provided at the corner of the rear plate 3 becomes the largest, and the stress gradually decreases as the distance from the support member increases.

Therefore, according to the cathode ray tube according to the third embodiment of the present invention, as shown in FIG. 11, 30 support members S1 to S30 are provided at the corners of the boundaries between the divided regions R1 to R20. The support members are arranged at regular intervals, and the distance D between the outermost support member and the side wall 2 is greater than the distance d between the support members. In addition, each support member S
Are arranged such that the longitudinal direction of the contact surface 18 coincides with the vertical direction Y.

The supporting members provided at the positions where a large stress is received among the supporting members, that is, the supporting members S1 to S6, S10, S11, S15, S1 located at the outermost periphery.
In 6, S20, S21, S25, and S26 to S30, the length of the contact surface 18 in the longitudinal direction is formed to be 20 mm, which is twice the length of the contact surface of the other support member, that is, 10 mm. The width of the contact surface 18 is common to all the support members S. Other configurations are the same as those of the above-described embodiment, and the same portions are denoted by the same reference numerals and detailed description thereof will be omitted.

Even with such a configuration, the face plate 1
The value of the maximum stress acting on the surface was reduced by 20%. As a result, it is possible to reduce the cost while sufficiently maintaining the reliability of the cathode ray tube with respect to the atmospheric pressure resistance, and to provide the cathode ray tube with sufficient strength against external force.

In the second and third embodiments,
Two types of the contact surface 18 of the support member S having a longitudinal length of 10 mm and 20 mm are used. The length of the contact surface of the support member S depends on the stress distribution applied to the vacuum envelope. The length can be selected variously, and the type of length is not limited to two but can be increased as necessary. Further, the position where the support member S is provided can be determined as appropriate.

Further, as described above, when the support members S1 to S30 having the same length of the contact surface are arranged at equal intervals at the corners of the boundaries of the divided regions R1 to R20 as shown in FIG. , S7, S9, S22, S
24 position, about twice the size of the position of S1,
It is about 5 times the position of S3. Therefore, in this case, by reducing the number of support members provided in portions where the acting stress is relatively small, and conversely, by increasing the number of support members in portions where large stress is applied, the atmospheric pressure resistance of the vacuum envelope is reduced. It is possible to reduce the total number of support members to be installed while maintaining strength.

Therefore, according to the cathode ray tube according to the fourth embodiment of the present invention, as shown in FIG.
Are provided side by side along six mutually parallel columns C1 to C6 corresponding to the boundary lines extending in the vertical direction Y of the divided regions R1 to R20.

According to the distribution of the stress acting on the vacuum envelope 10, the rows C1 and C6 which receive relatively small stress are each provided with two support members S, and the rows corresponding to the portions which receive the large stress are provided. Each of C2 and C5 is provided with six support members S at equal intervals.
Each of the remaining rows C3 and C4 is provided with five support members S, as in the case of FIG.

According to the above configuration, the number of support members can be reduced from 30 to 26, and the maximum stress value acting on the vacuum envelope is reduced by about 15%, as compared with the configuration of FIG. I was able to. FIG. 13 shows the stress distribution between the vacuum envelope having the structure shown in FIG. 4 and the vacuum envelope according to the fourth embodiment. In FIG. 13, a curve c indicated by a solid line is shown in FIG. The stress distribution along the line GG of the vacuum envelope is
A curve d shown by a broken line is a line I- of the vacuum envelope shown in FIG.
The stress distribution along I is shown. As can be seen from this figure, according to the present embodiment, the maximum stress value acting on each position of the vacuum envelope can be reduced. Therefore, according to the present embodiment, it is possible to reduce the cost while improving the reliability of the vacuum envelope 10 against atmospheric pressure.

The present invention is not limited to the above-described embodiment, but can be variously modified within the scope of the present invention. In each of the embodiments, the support member is not limited to a one-piece structure made of a bar-shaped metal, and may be, for example, a two-stage support member divided into a base end portion and a front end portion,
Alternatively, a plate-like support member may be used. The material of the support member is not limited to metal, but may be glass, ceramics, or the like. Further, the support member may be a combination of several types, and is not limited to a prismatic shape, but may be a cylindrical shape.

In the second to fourth embodiments, the support means shown in the first embodiment may be used in combination. Furthermore, in each of the above-described embodiments, a cathode ray tube of a type that performs color selection using a shadow mask has been described. However, the present invention is not limited to this. For example, a monochrome cathode ray tube, a cathode ray tube of an index type, and an electron emission unit The present invention can also be applied to a cathode ray tube using a cold cathode electron emission element.

[0056]

As described in detail above, according to the present invention,
By reinforcing the portion of the face plate with which the tip of the support member comes into contact with the reinforcing means, the generated stress can be supported and the atmospheric pressure resistance can be increased. As a result, according to the present invention, it is possible to provide a cathode ray tube that sufficiently maintains the reliability of the atmospheric pressure resistance of the vacuum envelope and has sufficient strength against external force.

According to the present invention, the stress is dispersed and the atmospheric pressure resistance is increased by increasing the contact area between the support member located at the portion where the stress value of the vacuum envelope is the largest and the surrounding portion. Can be raised. Further, for other portions where the stress value is small, by using a support member having a small contact area, the amount of use of the entire support member can be suppressed. As a result, the cost is reduced while maintaining the reliability of the atmospheric pressure resistance of the vacuum envelope sufficiently,
In addition, a cathode ray tube having sufficient strength against external force can be provided.

Further, according to the present invention, the support members are arranged in a plurality of rows, and the number of the support members provided in a row corresponding to a portion having a small stress value in the vacuum envelope is reduced. To reduce the maximum stress value acting on the vacuum envelope by reducing the number of support members provided in a row corresponding to a portion having a large stress value, and to reduce the total number of installed support members. Can be. Thus, it is possible to provide a cathode ray tube capable of reducing costs while sufficiently maintaining the reliability of the atmospheric pressure resistance of the vacuum envelope.

[Brief description of the drawings]

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

FIG. 2 is a diagram schematically showing a part of a phosphor screen of the cathode ray tube.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

FIG. 4 is a perspective view showing a rear plate, a side wall, and a support member in the cathode ray tube.

FIG. 5 is an exploded perspective view for explaining a mounting process of the support member.

FIG. 6 is a perspective view showing a reinforcing plate provided on the phosphor screen side.

FIG. 7 is a sectional view of the cathode ray tube at the support member portion.

FIG. 8 is a perspective view of a phosphor screen according to a modification of the cathode ray tube in the first embodiment and a cross-sectional view corresponding to FIG.

FIG. 9 is a perspective view showing a rear plate, a side wall, and a support member of a cathode ray tube according to a second embodiment of the present invention.

FIG. 10 is a graph showing a comparison between stress distributions of the cathode ray tube shown in FIG. 4 and the cathode ray tube shown in FIG. 9;

FIG. 11 is a perspective view showing a rear plate, a side wall, and a support member of a cathode ray tube according to a third embodiment of the present invention.

FIG. 12 is a perspective view showing a rear plate, a side wall, and a support member of a cathode ray tube according to a fourth embodiment of the present invention.

FIG. 13 is a graph showing a comparison of stress distribution between the cathode ray tube shown in FIG. 4 and the cathode ray tube shown in FIG.

[Description of Signs] 1 ... face plate, 2 ... side wall 3 ... rear plate 5 ... funnel 7 ... phosphor screen 8 ... black light absorbing layer 9 ... shadow mask 10 ... vacuum envelope 14 ... deflecting device 15 ... neck 16 ... Electron gun 18 ... Contact surface 20 ... Reinforcing plate 26 ... Frit glass S ... Support member

Claims (11)

[Claims] 1. A substantially rectangular flat face plate, a substantially rectangular flat rear plate provided opposite to the face plate, and a phosphor formed on an inner surface of the face plate. A vacuum envelope including a screen; an electron emission unit provided on the rear plate, for emitting electrons toward the phosphor screen; and the face disposed between the face plate and the rear plate. A cathode ray tube comprising: a plurality of support members for supporting atmospheric pressure applied to a plate and the rear plate; and reinforcing means for reinforcing a portion of the face plate with which the support member comes into contact. 2. The cathode ray tube according to claim 1, wherein said reinforcing means includes a reinforcing plate fixed to said phosphor screen and in contact with a tip of said support member. 3. The apparatus according to claim 1, wherein said reinforcing means includes a tip portion of said support member and an adhesive sealed to a portion of said face plate with which said tip portion abuts. A cathode ray tube as described. 4. A substantially rectangular flat face plate, a substantially rectangular flat rear plate provided opposite to the face plate, and a phosphor formed on an inner surface of the face plate. A vacuum envelope including a screen, an electron emission unit provided on the rear plate and emitting electrons toward the phosphor screen, and disposed between the face plate and the rear plate. And a plurality of support members each having an abutment surface in contact with the face plate and supporting an atmospheric pressure applied to the face plate and the rear plate, wherein the plurality of support members are disposed at an arrangement position. A cathode ray tube having a contact surface having a different area according to the size of the cathode ray tube. 5. The cathode ray tube according to claim 4, wherein the contact surfaces of said support members are formed in different areas according to the distribution of stress acting on said face plate. 6. A contact surface of the support member provided at a portion where a stress acting on the face plate is large, as compared with a contact surface of a support member provided at a portion where a stress acting on the face plate is small. The cathode ray tube according to claim 5, wherein the cathode ray tube is formed so as to be large. 7. The phosphor screen includes a plurality of phosphor layers extending in parallel with each other along a predetermined direction, and a light absorbing layer provided between the phosphor layers. It has an elongated rectangular contact surface extending along the predetermined direction and contacting the light absorbing layer, and the contact surfaces of the plurality of support members have the same width as each other, The cathode ray tube according to any one of claims 4 to 6, wherein the length is different depending on the disposition position. 8. A substantially rectangular flat face plate, a substantially rectangular flat rear plate provided opposite to the face plate, and a phosphor formed on an inner surface of the face plate. A vacuum envelope including a screen; an electron emission unit provided on the rear plate, for emitting electrons toward the phosphor screen; and the face disposed between the face plate and the rear plate. And a plurality of support members for supporting the atmospheric pressure applied to the plate and the rear plate, wherein the plurality of support members are arranged along a plurality of substantially parallel rows substantially equidistant from each other. The cathode ray tube, wherein the support members in the row are arranged at plural kinds of intervals. 9. The cathode ray tube according to claim 8, wherein the distance between the support members in each row is set to a different distance according to the distribution of stress acting on the face plate. 10. The spacing between the support members provided in the row corresponding to the portion where the stress acting on the face plate is large is the same as the spacing between the support members provided in the row corresponding to the portion where the stress acting on the face plate is small. The cathode ray tube according to claim 9, wherein the distance is set to be smaller than the interval. 11. A cathode ray tube according to claim 4, further comprising reinforcing means for reinforcing a portion of said face plate with which said support member abuts.