KR920000937B1 - The shadow mask for color picture tube - Google Patents

Abstract

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Description

Bird Sword Mask for Color Winner

1 is an enlarged plan view of a main part of a shadow mask for a color water pipe according to a first embodiment of the present invention.

2 is a cross-sectional view taken along line II-II of the first view.

3 is a cross-sectional view taken along line III-III of FIG.

4 is a schematic plan view of the bonded shadow mask body.

5 is a perspective view of a press-formed shadow mask body.

6 is an enlarged plan view of an essential part of a shadow mask for a color water pipe according to a second embodiment of the present invention;

7 is a cross-sectional view taken along the line VV of FIG.

8 is a cross-sectional view taken along the VI-VI line of FIG.

9A and 9B are cross-sectional views taken along line I-I of FIG. 10 showing the assembled state before and after welding of a plurality of shadow masks as a third embodiment of the present invention.

Fig. 10 is a plan view showing a part of the direction away from the center of the shadow mask seen from the fluorescent surface side.

11 is a cross-sectional view taken along the line III-III of FIG.

12 is a cross-sectional view taken along the line I-I of FIG. 13 showing the assembling state of a plurality of shadow masks as a fourth embodiment of the present invention.

Fig. 13 is a plan view showing a part of the direction away from the center of the shadow mask seen from the fluorescent surface side.

14 is a cross-sectional view taken along the line III-III of FIG.

15 is a perspective view of a part of a conventional shadow mask type color water pipe.

16 is the temperature of the elapsed time of operation of the frame and the shadow mask plate in the conventional shadow mask type color water pipe.

FIG. 17 is a characteristic view for explaining an example of the doming of a shadow mask structure and its correcting operation in a conventional color receiver; FIG.

FIG. 18 is a characteristic diagram for explaining an example of mis-landing caused by thermal expansion of a frame and its correction operation in the conventional shadow mask structure of FIG. 17. FIG.

19 is a characteristic diagram for explaining an example of local doming of a shadow mask structure in a conventional color receiver, the same drawing (a) is a front view of the screen in the color receiver, and (b) Is a top view of color water pipes.

20 is an enlarged plan view of a main part of a conventional shadow mask structure for a color water pipe.

* Explanation of symbols for the main parts of the drawings

1: Funnel 2: Panel

3: fluorescent surface 4: pin

5: shadow mask structure 6: electron beam

7: bird mask body 9: frame

10 thermal expansion correction mechanism 13 electron beam through hole

14 neck portion 15 bimetal

21,22,51,52: Bird mask plate 23,25,43,45,53,55: Through hole

24, 26, 44, 46, 54, 56: side wall 27, 57: non-penetrating hole

28,48,58: bottom part 29, 48a, 59: weld part

30,31,60,61: annular groove 63A, 63B, 63C: bridge

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shadow mask for color water tubes, which is constructed by welding a plurality of shadow mask plates and has an electron beam passing hole for passing an electron beam through a fluorescent surface axis in the receiving tube.

FIG. 15 is a partially cutaway perspective view schematically showing the configuration of a conventional shadow mask type color water pipe. In the same figure, (1) is a funnel-shaped funnel, and the fluorescent surface 3 is formed in the inner surface of the panel 2 to which the funnel 1 was sealed and attached to the open end. Several fins 4 are provided on the side wall of the panel 2, and the shadow mask structure 5 provided opposite the fluorescent surface 3 is supported by the fins 4. 12A, 12B, and 12C are electron guns arranged in the neck portion 14 of the funnel 1.

(7) is a shadow mask body having a spherical shape substantially the same as the inner surface of the panel 2, wherein the shadow mask body 7 is radiated from the electron guns 12A, 12B, and 12C. A portion having a hole having a plurality of electron beam through holes 13 for selectively passing the electron beams 6A, 6B, and 6C (hereinafter referred to as a hole) and a portion having no hole formed in the outer circumference of the hole (Hereinafter referred to as no study).

8 is a bent skirt portion for attachment to the frame 9, which skirt portion 8 is fixed to the frame 9 by welding, for example, at 16 locations over its entire circumference. (10) is a thermal expansion correction mechanism welded to the frame (9), and the thermal expansion correction mechanism (10) is used to correct color shift due to thermal expansion of the shadow mask body (7) generated during the operation of the color receiving tube. It is prepared.

The thermal expansion correction mechanism (10) is composed of a bimetal (15) and a spring (11) welded to the bimetal (15), the spring (11) is engaged with the pin (4) to open the shadow mask body (7) The panel 2 is held in a relative position. The shadow mask structure 5 is composed of a shadow mask body 7, a frame 9 and a thermal expansion correction mechanism 10.

In the shadow mask type color tube having the above structure, the electron beams 6A, 6B, and 6C emitted from the electron guns 12A, 12B, and 12C are the shadow mask body ( The phosphors collide with the fluorescent surface 3 through the electron beam passage hole 13 provided in the hole portion 7) to emit light of red, green, and blue light.

By the way, the total area of the electron beam through-hole 13 of the shadow mask main body 7 is about 15%-about 25% of the surface area of the said shadow mask main body 17, and the electron beams 6A, 6B, ( Most of 6C) collides with the no-holes of the perforations to heat the shadow mask body 7. For example, as a result of measuring the temperature of the shadow mask structure 5 in the 21-inch color water pipe, the temperature rise as indicated by curves (A) and (B) in FIG. 16 was observed.

That is, when the temperature of the shadow mask main body 7 was measured under the condition of a high voltage of 28 KV and a beam current of 1 mA, the temperature rise was remarkable for the first 5 minutes as indicated by the characteristic curve A of FIG. 16, and saturated at 30 minutes. It became a state and the temperature rise of about 40 degreeC was confirmed.

On the other hand, as a result of measuring the temperature of the frame 9 under the same conditions, the heat capacity of the frame 9 is larger than that of the shadow mask main body 7, and as shown by the characteristic curve B of FIG. Similarly, the temperature rose slowly and became saturated after about 1 hour.

When the temperature rises in this manner, first, the shadow mask main body 7 thermally expands in a dome shape (hereinafter referred to as "doming") and protrudes along the fluorescent surface 3 axis, thereby causing color shift (hereinafter referred to as mislanding).

That is, as shown in FIG. 17, the shadow mask main body 7, which was in the state indicated by the solid line S in the same drawing before the start of operation, has the fluorescent surface as a whole by fixing the junction W with the frame 9 as the temperature rises. 3) Thermal expansion in a dome shape is indicated by the dotted line S1 on the side. By this doming, the electron beam passing hole 13 at the normal position indicated by the point H on the same drawing moves to the point H1, and the point P on the fluorescent screen 3 must reach the point P, for example, the electron gun 12A. The electron beam 6A at) reaches the point P1, resulting in mislanding.

This kind of mis-landing is characterized by shifting in the direction of the central portion Z (arrow a direction) of the fluorescent screen 3, and it is impossible to display normal color images by emitting phosphors of adjacent different colors. Such shapes appear throughout the screen.

This was measured in a 21-inch color water pipe having a diagonal inner surface radius of the panel 2 at 1350 mm, which is most remarkable on the long axis of 150 mm from the central axis Z of the face surface of the panel 2, and has a high voltage of 28 KV and a beam current. Under the condition of 1 mA, the electron beam moved by 0.05 to 0.08 mm, causing color shift.

When the temperature of the frame 9 gradually rises and approaches the saturation state, as shown in FIG. 18, the frame in the state indicated by the solid line F of the same drawing before the start of operation due to thermal expansion of the frame 9 itself ( 9) is thermally expanded as indicated by the dotted line S1 in the radial direction as a whole. As a result, the shadow mask body 7 which was in the state indicated by the solid line S of the same drawing before the start of operation is displaced as indicated by the dotted line S2 in the radial direction as the joint W with the frame 9 moves to the point W1. . By this displacement, the electron beam passing hole 13 at the normal position indicated by the point H of the same drawing is moved to the point H2, and the point P on the fluorescent screen 3 must reach the point P, for example, the electron gun ( The electron beam 6A at 12A reaches point P2 and becomes mislanding.

This kind of mis-landing is shifted in the direction of the periphery of the fluorescent screen 3 (in the direction of arrow b), and emits phosphors of a color different from the phenomenon appearing at the beginning of the operation of the color receiver as described above, causing the color receiver to emit light. Like in the beginning of the operation, the normal color image cannot be thrown out.

The above phenomenon is a phenomenon that appears continuously while the color receiver is continuously operating and needs to be corrected.

2. Description of the Related Art Conventionally, various methods have been known in which the thermal expansion correction mechanism 10 is interposed between the shadow mask main body 7 and the frame 9 for the correction thereof.

On the other hand, the frame 9, which was in the state indicated by the solid line F of FIG. 18 at the start of operation due to the temperature rise of the frame 9, passes through the electron beam at the normal position indicated by the point H by thermal expansion as indicated by the dotted line F1. Move the hole 13 to point H2.

However, when the shadow mask main body 7 and the frame 9 are brought closer to the fluorescent surface 3 side as indicated by the imaginary lines S3 and F3 by the thermal expansion correction mechanism 10, the normal position indicated by the point H of the same drawing. The electron beam passage hole 13 located at the position moves to the point H3, and the electron beam passage hole 13 moved to the point H3 is a point on the fluorescent surface 3 to which the electron beam 6A in the electron gun 12A must originally arrive. The position toward P is reduced, and mislanding is reduced.

Conventionally, for example, bimetal 15 is used as such a thermal expansion correction mechanism 10, and Japanese Patent Laid-Open No. 43-26152, Japanese Patent Laid-Open No. 44-3547, Patent Publication No. 47-3506, Patent Publication No. 47-40505 is known.

However, as shown in FIG. 19A, for example, when the screen 16, which is a dark field of view A and a circular high luminance portion B, is received, the same figure (b) corresponding to the high luminance portion B is received. The local part 7a of the shadow mask main body 7 shown in figure is thermally deformed, and color shifting arises by local doming. The color shift cannot be corrected by the conventional thermal expansion correction mechanism 10 by such local doming.

Means for thickening the shadow mask body 7 as described in the Journal of Television Journal "Theoretical Review on Local Doming Phenomena of Shadow Mask Tubes" in solving the problem of color misalignment caused by local doming. It is theoretically proven that this is valid.

Generally, however, the shadow mask main body 7 is manufactured by the chemical method of the etching method described, for example in Unexamined-Japanese-Patent No. 51-9264.

In this chemical manufacturing method, between the plate thickness t of the shadow mask body 7 and the size Sw of the electron beam passage hole 13 through which the electron beam passes.

Sw> 0.8xt ... … … … … … … … … … … … … … … … … … (One)

There is a condition that it is impossible to provide small holes in a thick plate by satisfying this condition.

That is, when the setting pitch of the phosphors constituting the fluorescent surface 3 is reduced in order to improve the resolution of the color receiver, the shadow mask body 7 has the electron beam passage hole 13 formed therein to exhibit its color selection function. Of course, the size of must necessarily be made smaller.

On the other hand, in order to suppress color shift by thermal deformation of the shadow mask main body 7 and to maintain good color purity, the thick shadow mask main body 7 requires the same thing as the above-mentioned article of the television journal.

However, both of these have a clearly contradictory relationship in the above formula (1). Therefore, in order to satisfy both of these, it is very difficult from the manufacturing point of view to provide the small electron beam passage hole 13 in the shadow mask body 7 which is a thick sheet.

Therefore, as described in Japanese Patent Laid-Open No. 57-138746, for example, a plurality of thin shadow mask plates are laminated and welded to constitute a substantially thick shadow mask body 7. It was suggested to do.

That is, in FIG. 20, (21) and (22) are two thin shadow mask plates, and these shadow mask plates 21 and 22 are very thin aluminum-kilted steels of 0.3 mm or less in general. In addition, a plurality of through holes 13a and 13b serving as electron beam through holes 13 are formed by the etching method.

After the shadow mask plates 21 and 22 are laminated, welding is started on the surface 22a of the shadow mask plate 22 using, for example, a laser beam or the like. The metal welded portion 38 is irradiated with a laser beam on the other side of the surface 22a of the shadow mask 22 via the surface K where the two shadow mask plates 21 and 22 are bonded to each other. The molten portion is solidified by melting the mask mask 21 of N as much as necessary for melt bonding, and then blocking the irradiation of the laser light. The shadow mask plates 21 and 22 are joined to each other by the welded portion 38 of the solidified metal, thereby forming the shadow mask body 7.

However, according to the other welding, the volume of the welding portion 38 is relatively large, so when the welding portion 38 shrinks in the process of melting and solidifying, the thickness of the vicinity thereof is stretched, so-called welding distortion occurs. . As a result, the shadow mask main body 7 deforms, and deformation is further promoted by the press work for forming a spherical shape, and there is a drawback in that the shadow mask main body 7 cannot function as a shadow mask for color water pipes.

An object of the present invention is to solve the above problems and to prevent deformation caused when melt-bonding a plurality of laminated masks laminated to the high-resolution, and can be configured for a color water pipe that can form a color water pipe with good color purity It also provides a new mask construction.

Another object of the present invention is to prevent the deformation of the shadow mask by welding distortion and at the same time to produce a shadow mask with a thick plate thickness to prevent thermal deformation of the shadow mask due to the collision of electron beams. To provide a mask.

The shadow mask structure for color water pipes according to the present invention forms a non-penetrating hole on one side of two adjacent shadow mask plates among the stacked plurality of mask mask plates, and passes through the non-penetrating holes to provide a plurality of shadow masks. The joining surfaces of the two sade mask plates are formed by opposing the annular grooves, and at least a part of each of the annular grooves is opened in the electron beam through hole so as to melt-bond the plate and surround the welding part. It features.

In addition, the shadow mask for color water pipes according to the present invention is a shadow mask provided on the inner surface of the panel facing the mold pipe surface, a frame fixing the outer circumferential surface of the shadow mask, and fixed to the frame to prevent thermal expansion of the shadow mask. In the shadow mask type color receiving tube having a heat correction mechanism for correcting, the shadow mask is formed by welding two pieces of masks laminated together in the panel side and the electron gun side direction, and penetrated through one shadow mask. A hole is provided, and the joining surface with the other shadow mask corresponding to the small diameter part of this through-hole is melt-bonded.

In addition, in the above-mentioned shadow mask type color receiving tube having a shadow mask, a frame, and a heat correction mechanism, the shadow mask is formed by stacking and bonding one mask to a thick mask having a plate thickness without a bridge. The mask on the side is a mask having a thinner bridge than the above mask, and provides a non-penetrating annular groove around the weld joint of both masks.

According to the present invention, the melt volume of the shadow mask plate is made small by melt bonding through two shadow masks adjacent to each other and a non-through hole formed in one of the shadow mask plates, so that the weld distortion due to the solidification shrinkage of the melt portion is reduced. The distortion amount becomes small. Since the distortion of the weld distortion is blocked and absorbed by the annular groove formed to surround the welded portion, the deformation of the thickness portion other than the welded portion can be suppressed. Therefore, deformation of the shadow mask body of the laminated structure can be made extremely small.

In addition, since the annular groove is opened in the electron beam through hole, the impurity gas remaining in the annular groove during welding is easily discharged to the outside through the electron beam through hole even when the shadow mask body is assembled in the color receiving tube. . Therefore, it is possible to maintain the inside of the color water pipe as a high hole and to prolong its life.

In addition, the molding distortion caused by the difference in the position of the neutral line of the plate thickness of both masks during press molding can be reduced because the bridge does not have one mask.

Other objects and novel features of the present invention will become apparent from the description and the accompanying drawings.

In addition, in all the drawings for demonstrating an embodiment, the thing which has the same function is attached | subjected with the same code | symbol, and the repeated description is abbreviate | omitted.

Example 1

FIG. 1 is an enlarged flatness view of the main part of the shadow mask structure for a color receiving tube according to an embodiment of the present invention from the fluorescent surface side, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is III of FIG. It is sectional drawing along the -III line.

In addition, since the overall configuration of the shadow mask type color water pipe is the same as that shown in FIG. 15, the following description will be made with reference to the same drawings.

In FIG. 1, reference numeral 21 denotes a relatively thin one-sided mask plate provided on the electron guns 21A, 12B, and 12C side. As clearly shown in Fig. 2, the other shadow mask plate 22 is laminated. The shadow mask plate 22 is provided on the side of the fluorescent surface 3 serving as the main body of heat conduction, and is formed relatively thick to reinforce the shadow mask plate 21.

Reference numeral 23 denotes a slot-type through hole that forms the electron beam through hole 13 provided in the shadow mask plate 21, 24 indicates a side wall of the through hole 23, and 25 indicates a shadow mask plate 22. The through-hole 25 is formed somewhat larger than the through-hole 23 on the side of the shadow mask plate 21 as a slot-like through-hole which forms the electron beam through-hole 13 provided in the above. Reference numeral 26 is a side wall of the through hole 25.

Reference numeral 27 denotes a non-penetrating hole formed on the surface 22a side of the shadow mask plate 22, 28 a bottom portion of the non-penetrating hole 27, and 29 denotes a portion of the non-penetrating hole 27. The welding portion obtained by melt-bonding two shadow mask plates 21, 22 through the bottom portion, 30 is an annular groove formed in the shadow mask plate 22, the annular groove 30 is the weld portion It is formed in the bonding surface K with the masking plate 21 so that the circumference | surroundings of (29) may be enclosed.

Numeral 31 is an annular groove formed in the shadow mask plate 21, and the annular groove 31 is formed in the joint surface K with the shadow mask plate 22 so as to surround the weld portion 29. It is. The two annular grooves 30 and 31 are partially opposed to each other, and one annular groove 31 is formed with an open hole 32 communicating with the through hole 23.

FIG. 4 is a schematic plan view of the shadow mask main body 7 and includes a hole 35 and a non-hole 36. The two holes of the shadow mask plate 21 and 22 are provided in the non-hole 36. Positioning holes 42A, 42B, and 42C for precise positioning are formed.

FIG. 5 is a perspective view of a state in which the shadow mask main body 7 shown in FIG. 4 is press-formed into a spherical shape, and the skirt portion 8 is bent integrally formed around it.

Next, the manufacturing method of the shadow mask main body 7 of the said structure is demonstrated.

First, a resist layer having a predetermined thickness is applied to both surfaces of each of the two mask mask plates 21 and 22. The images drawn by the automatic drawing device corresponding to one side of each of the shadow mask plates 21 and 22 are sintered and attached to the resist layer, respectively, and then the resist layer is removed in unnecessary portions.

Then, through the chemical etching method, the through holes 23, 25, the non-penetrating holes 27, the annular grooves 30, 31, and the positioning holes 42A, 42B, 42C. Only the corresponding metal is removed by corrosion to obtain the desired mask mask plates 21 and 22.

Subsequently, the shadow mask plates 21, 22 are joined at the surface side where the annular grooves 30, 31 are formed, and predetermined using the positioning holes 42A, 42B, 42C. It is attached to the jig (not shown) with correct positioning. Then, the electron beam is irradiated to the bottom part of the non-through hole 27 using an electron beam welding machine, and welding is started in the bottom part of this non-through hole 27.

The welding portion 29 of the metal by the electron beam is the surface K at which the two mask mask plates 21 and 22 are joined to each other at the bottom of the non-through hole 27 formed in the shadow mask plate 22. The molten part is solidified by melting the other shadow mask plate 21 by an amount necessary to melt-bond through the C1 and blocking the irradiation of the electron beam. The shadow mask plates 21 and 22 are welded to each other by the welded portion 29 of the solidified metal to form the shadow mask body 7.

Further, the amount of incident energy of the electron beam is set in order to determine the exact amount of melting of the metal corresponding to the welded portion 29 when welding by the electron beam welder.

By the way, when the welded part 29 is melted and solidified, welding distortion occurs as the solidification shrinks. However, the amount of melting of the welded portion 29 is as much as necessary to melt-bond the thickness t1 of the bottom portion of the non-through hole 27 formed in the shadow mask plate 22 and the other shadow mask plate 21. It is an amount corresponding to the molten thickness t2.

That is, the conventional welding part 38 melt | dissolves the other shadow mask plate 21 by ratio by melt | dissolving the quantity corresponding to thickness t3 of the shadow mask plate 22 as shown in FIG. It can be bonded.

However, by forming the weld part 29 in the bottom part of the non-through hole 27 as mentioned above, the melt amount of this weld part 29 is remarkably reduced. Therefore, when the welding part 29 solidifies by melting, the distortion amount of the welding distortion which arises by the shrinkage becomes small.

In addition, since the distortion of the weld distortion is blocked and absorbed by the annular grooves 30 and 31 formed so as to surround the weld portion 29, deformation of thickness portions other than the weld portion 29 can be suppressed. Therefore, deformation of the shadow mask main body 7 of the laminated structure can be made extremely small.

In addition, the annular grooves 30 and 31 are opened in the electron beam through hole 13 through the open hole portion 32 formed by one annular groove 31 and the through hole 23. The impurity gas that has flowed into the shape grooves 30 and 31 is easily discharged to the outside through the electron beam through hole 13 before the shadow mask body 7 is assembled in the color water pipe. Therefore, since there is no possibility of impurity gas being discharged in the color water pipe, it is possible to maintain the inside of the pipe at a high vacuum and to achieve a long service life.

Incidentally, in the first embodiment, the case where the shadow mask main body 7 is composed of two shadow mask plates 21 and 22 has been described. It goes without saying that the same result can be seen in the case where the above-mentioned new mask mask plate is formed by welding.

In the above embodiment, the welding of the two mask mask plates 21 and 22 in the above embodiments has been described with the use of an electron beam welding machine. However, the same effects are also applied to the case of welding using a laser beam as in the prior art. to be.

Moreover, in the said Example, the case where bimetal was used as the thermal expansion correction mechanism 10 of the shadow mask structure 5 was demonstrated, The same effect can also be exhibited using other well-known means.

Further, in the above embodiment, although the open hole portion 32 communicating with the electron beam passage hole 13 is formed in the annular groove 31 of one of the shadow mask plates 21, the open hole portion 32 Is formed in the annular groove 30 or the annular grooves 30 and 31 of the other bird mask tube 22 can have the same effect.

Example 2

6 to 8 show the second embodiment of the present invention, and the annular grooves 30 surrounding the circumference of the welded portions 29 of the two mask mask plates 21 and 22 are shown. The open hole part 32 which is formed only on the contact surface of one of the shadow mask plates 22 to be polymerized, and communicates with the annular groove 30 in the electron beam passing hole 13 of the other shadow mask plate 21. ), And the operation is the same as in the above embodiment.

Example 3

9 to 11 show a third embodiment of the present invention, and FIGS. 9a and b are cross-sectional views taken along line I-I of FIG. 10 showing the state before and after welding of the shadow mask according to the present invention. 10 is a plan view of the shadow mask seen from the fluorescent surface, and FIG. 11 is a sectional view taken along line III-III of FIG.

In each figure, 21 and 22 are shadow mask plates, 43 are through holes through which the electron beam of the shadow mask plate 21 passes, and 44 are shadow mask through holes 43, respectively. The side wall 45 of the through-hole is provided on the side of the shadow mask plate 22 to be joined to the shadow mask plate 21 and is made slightly smaller than the shadow mask through-hole 43, 46. The side wall of the silver shadow mask through hole 45, 47 is a through hole through which bonding energy provided on the shadow mask plate 22 side passes, and 48 is a shadow mask 21 and a shadow mask plate. It is the junction part which fuse | melted each other in order to join (22).

Next, the manufacturing method of the shadow mask which is a 3rd Example of this invention is demonstrated. In this embodiment, positioning holes 42A, 42B, (for positioning the shadow mask plate 21 and the shadow mask plate 22 accurately in the same manner as in the first embodiment. 42C) is preferably provided in the skirt 8 in addition to the surface corresponding to the fluorescent surface other than the hole portion of the shadow mask. Then, using the positioning holes 42A, 42B, and 42C in the predetermined jig so that the respective desired surfaces of the shadow mask plate 21 and the shadow mask plate 22 are in contact with each other, FIG. As shown in Fig. 2, the two masks 21 and 22 are accurately aligned and attached. Thereafter, the shadow mask plate 21 and the shadow mask plate (by using an electron beam welding machine having a mechanism capable of precisely positioning and precisely controlling the incident energy for melting the melt-bonding portion 48 in an instant) 22) is joined by forming a molten portion 48a as shown in FIG. 9B.

Since only two very small melt portions 48a are formed in this way, the two masks can be joined to each other. Therefore, there is almost no distortion and no dome shape of the melt portion 48a facilitates the post-processing. I can do it.

In yet embodiment of the third example, although described with respect to an example using an electron beam welder, may be used for other processing machine such as a YAG laser or CO ₂ laser.

Example 4

A fourth embodiment of the present invention will be described with reference to FIGS. 12 to 14.

In Figs. 12 to 14, 51 is a bird having a foot shape which is located on the electron gun side and has a relatively thick plate thickness of 0.20 mm, and has no bridge which is a main body of heat conduction by reinforcing the other bird mask. The mask plate 52 is bonded to the shadow mask plate 51 and is thinner than the shadow mask plate 51, and has a thickness of 0.13 mm and has a hole for fluorescence surface having holes for controlling electron beams. The plate 53 is a foot-shaped through hole through which the electron beam of the shadow mask plate 51 passes, 54 is a side wall of the shadow mask through hole 53, and 55 is a shadow mask plate 52. Is provided on the side to be joined to the shadow mask plate 51 of () and is made slightly smaller than the shadow mask through hole 53, and the through hole 56 connected to the bridge is the shadow mask through hole 55 Side walls of the non-penetrating holes 57 are non-through holes provided on the side of the shadow mask plate 52, 58 are bottom portions of the through holes 57, and The welded portions of the mask masks 51 and 52, 60 are non-penetrating annular grooves provided around the welded portion 59 of the shadow mask plate 52, and 61 are the shield mask plates 51. FIG. The non-penetrating annular grooves 63A, 63B and 63C of the shadow mask hole 53 in contact with each other are bridges provided to connect the holes 55 provided in the shadow mask plate 52.

In general, since the plate thickness of the shadow mask is thin, the shrinkage stress around the welding point acts due to the welding distortion generated when the melted portion of the shadow mask solidifies, so that the internal stress can be easily made. Transform.

In the fourth embodiment of the present invention, the non-penetrating annular grooves 60 and 61 are placed very close to the welded part so that the internal stresses that adversely affect the circumference of the molten part of the shadow mask are not affected. It is possible to prevent the deformation of the shadow mask by preventing the absorption of the welding stress from being widened, stopping the distortion around the welding portion, and insulating it from the outside. When the annular flaws are provided on the surfaces of the shadow masks 51 and 52 that are in contact with the shadow mask, they are blocked from the inside of the water pipe to enclose impurity gas, and are gradually released into the water pipe during the operation of the water pipe, and thus the life of the water pipe is slowly To shorten.

In order to solve such a problem, in this invention, a part of annular groove 60 is arrange | positioned so that it overlaps with hole 53 of the shadow mask plate 51, and the open hole in a water pipe is provided. Since the shadow mask plate 52 is made thinner than the shadow mask plate 51, a narrow through hole 55 can be easily formed, and each through hole 55 is isolated. Since the bridges 63A, 63B, and 63C are provided on the thinner side, the width can be narrowed, the transmittance of the electron beam can be improved, and the luminance of the fluorescent surface can be increased. In addition, although the through-holes 53 and 55 of the shadow mask plates 51 and 52 are relative to each other, the passage of the electron beam is restricted to the through-hole 53, and passes through the through-hole 53. Since the electron beam is provided at a position where it does not collide with the side walls 54 and 56 to minimize thermal deformation, the through hole 55 with respect to the through hole 53 along the trajectory of the electron beam to maximize the overlap of the shadow mask. ). In addition, since the bridge is not provided on the side of the thick mask plate 51 having a thick plate thickness, no deviation strain stress is applied to the shadow mask plate 51 at the time of press molding the welded shadow mask. Press molding can be performed. As described above, according to the present invention, a plurality of stacked shadow mask plates can be melted and joined to form a thick shadow mask body, and the obtained thick shadow mask body has wrinkles caused by welding distortion and each laminated shadow mask. It is possible to prevent deformation between the glass and misalignment between the plates.

Therefore, in order to improve the resolution of the color receiving tube, the setting pitch of the phosphors emitting red, green, and blue colors constituting the fluorescent surface is reduced, so that the size of the electron beam through hole formed in the shadow mask body can be reduced.

Moreover, in order to suppress color shift by the thermal deformation of a shadow mask main body, and to maintain favorable color purity, a thick shadow mask main body is obtained easily.

That is, according to the shadow mask structure for color water tubes according to the present invention, the improvement of the resolution and the improvement of the color purity can be achieved together.

In particular, according to the shadow mask structure according to the present invention, since the shadow mask body is thick, the shadow mask generated by the collision of the electron beam to the local shadow mask plate as theoretically proved in the literature of the television journal. It is possible to prevent heat deformation of the plate itself, that is, local dominance, thereby providing a color receiver having good color purity.

In addition, since the impurity gas generated at the time of melt bonding of the shadow mask main body can be easily discharged to the outside, the inside of the receiving tube can be flowed into a high vacuum, thereby achieving a long service life of the color receiving tube.

In addition, according to the present invention, since the wrinkle mask due to welding distortion, the misalignment of the glass of the two shadow masks and the position of the shadow mask holes can be prevented in the process of pressing the shadow mask in a press operation or the like, the pitch for high resolution is fine and new. Since the plate thickness of the mask can be thickened, the thermal deformation of the shadow mask due to the collision of the electron beam can be prevented, so that a color water pipe with good color purity can be provided.

Moreover, since the transmittance | permeability of an electron beam can be made high, the image of a bright screen can be provided.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example, Of course, various changes are possible in the range which does not deviate from the summary.

Claims (2)

A shadow mask 7 provided opposite the fluorescent surface formed on the inner surface of the panel, a frame 9 fixed to the outer circumference of the shadow mask 7 and a row fixed to the frame to correct thermal expansion of the shadow mask In the shadow mask type color receiving tube having the correction mechanism 10, the mask 7 is formed as two shadow masks welded and laminated in the panel side and the electron gun side direction, and penetrates to one shadow mask. A shadow mask for color water pipes, wherein a hole is formed and a bonding surface of the other shadow mask corresponding to the small-diameter portion of the through hole is melt-bonded. A shadow mask 7 provided to face the fluorescent surface of the inner surface of the panel, a frame 9 for fixing the outer circumferential surface of the shadow mask, and a heat correction mechanism 10 fixed to the frame to correct thermal expansion of the shadow mask. In the shadow mask type color receiving tube having the above-mentioned shadow mask, the shadow mask is formed by stacking and bonding one mask to a thick mask having no bridge, and the other mask having a thinner bridge than the mask. A shadow mask for color water pipes, characterized in that a non-penetrating annular groove is formed around a weld joint of both shadow masks.