CN1068975C - Reed of gas eliminating agent and cathod adopting said reed - Google Patents

Abstract

Provided are a getter reed assembly and a CRT using the reed assembly. The getter reed imparts little heat to the CRT assembly, ie, the funnel glass of the CRT, during the getter transpiration process during the manufacture of the CRT. The getter reed assembly includes: a container for storing a getter therein; and a getter reed for supporting the container, wherein the container is attached to the on the getter reed and make point contact between the container and the getter reed at one point on the other part, thereby reducing the heat conduction to the getter reed during the getter evaporative process.

Description

Getter reed and cathode ray tube using getter reed

The present invention relates to a getter spring and a cathode ray tube (CRT) using the getter spring.

Cathode ray tubes are widely used in television receiving equipment, display equipment for computers, and the like.

The inside of the CRT is kept under a high vacuum state. A high degree of vacuum is achieved by a getter transpiration process performed when the CRT is manufactured.

The getter transpiration process is performed after the degassing process for creating a vacuum inside the CRT component during the manufacture of the CRT. In the getter evapotranspiration process, the getter mainly composed of metal barium Ba and placed in the CRT in advance is heated by high frequency from the outside of the CRT component (that is, the gas generated at the getter heated by a vortex that heats the latter). The gas remaining in the CRT member is absorbed when the vaporized metal is condensed, thereby increasing the degree of vacuum in the CRT member to obtain a high vacuum. In the getter evapotranspiration process, the vaporized metal can capture certain materials such as dust remaining in the CRT component, thereby causing the vaporized material to fall on the inner peripheral surface of the funnel of the CRT component .

A getter reed has an end portion secured to an electron gun contained within said CRT and extends along an inner sloped surface of said funnel. The getter reed acts as a supporting container for supporting a container for installing (accommodating) the getter at its tip portion.

A getter reed 81 is shown in FIGS. 1A to 1D . 2A to 2D show a container 15 and the getter reed 81 for supporting the container 15 .

The getter reed 81 is made of an appropriate material with certain strength, good heat resistance and electrical conductivity, namely SUS304 (spring material). The container 15 is made of a material capable of withstanding the high temperature generated during the process of evapotranspiration of the getter, namely SUS304.

FIG. 1A shows a front view of the getter reed 81 without treatment. As shown in FIG. 1A , the getter reed 81 is in the shape of a cross. The getter reed 81 has a long strip consisting of long strips 81a, 81b and a short strip 81c. The total length of the elongated portions 81a and 81b extends approximately 118mm in the horizontal direction shown in FIG. 1A, while the short strip portion 81c extends in the longitudinal portion shown in FIG. 1A, that is, extends along the line D-D' About 22mm. The elongated portion is divided into elongated portions 81a, 81b at position 82 and connected to each other using an insulating member 21, which will be described later.

FIG. 1B is a side view of the strip portion 81 a of the getter reed 81 . As shown in FIG. 1B, when the getter reed 81 is placed on the inner side of the CRT funnel body, the elongated portion 81a is gradually bent so as to extend along the inclined surface of the funnel portion. As shown in FIG. 1B, the getter reed 81 is bent at 10°, 20°, 20°, and 20° at multiple bending portions, namely six positions I, II, III, IV, V, and VI. , 15° and 12°.

FIG. 1C shows in detail the front end portion of the elongated portion 81a (the portion shown by the dotted circle in FIG. 1B ). As shown in FIG. 1C, the front end has a spoon-shaped curved portion 83, and its convex portion is in contact with the inner conductive coating of the funnel part of the CRT shown in FIG. The curved portion 83 is in the shape of a spoon, so that the convex portion and the internal conductive coating can reliably contact each other. In addition, the spoon-shaped curve portion 83 can also prevent the internal conductive coating from being damaged.

The short strip portion 81C of the cross-shaped getter reed 81 has curved portions 84a, 84b formed at respective ends as shown in FIG. 1D which shows the short strip in detail. Section 81c. Each of the curved portions 84a, 84b has a convex surface for reliable contact with the inner conductive plating film 8 .

As shown in Figures 2A and 2B, the container 15 is annular in shape and has a groove (recessed portion) 91 for installing (or storing) a getter 92 thereon (or in it) . FIG. 2B is a perspective view showing the container 15 on which (or in) the getter 92 is mounted (or stored).

The two curved portions 84a, 84b of the short strip portion 81c of the getter reed 81 engage with the bottom surface 15a of the container 15 to install (or store) the getter on (or in) it. Agent 92. As shown in FIG. 2C, the container 15 is connected to the getter 92 by welding at locations 93a, 93b. Therefore, when the above-mentioned getter reed 81 , insulating material 21 and container 15 are assembled together, the components are configured as shown in FIG. 2D .

Fig. 3 is a simple sectional view showing the manner in which the components are assembled into the CRT. The getter reed 81 has an end connected to the deflection electrode plate 3b inside the electron gun 2 . The getter reed 81 connected by the insulating plate 21 extends along the inner inclined surface of the funnel portion at a distance from the inner inclined surface. Only at the convex surface of the curved portion provided at the top end of the elongated portion 81a and both ends of the short portion 81c, the getter reed 81 is in contact with the inside of the funnel portion. The conductive coatings 8 are in contact with each other.

The getter reed 81 is made of the spring material and has a resilience. In addition, the total angle formed by the plurality of curved portions is greater than the angle of the inner inclined portion of the funnel portion. Therefore, when the member formed by the getter reed 81, the insulating material 21 and the container 15 is mounted on the inner deflection electrode plate 3b of the CRT electron gun, all but only the getter reed 81 Except that the top part of the elongated part 81a and the convex parts of the curved parts 83, 84a, 84b at both ends of the short strip part 81c are in contact with the internal conductive coating 8, the getter reed 81 is floating on the funnel portion of the CRT member.

The insulating material 21 connects one elongated portion 81a and the other elongated portion 81b of the getter reed 81 to each other, and is attached to the electron gun 2 of the CRT. Since when the CRT is used as a display device, unless the getter reed 81 and the electron gun 2 (that is, the internal deflection electrode plate 3b) are electrically insulated from each other, it may discharge, so such a configuration is used to insulate the getter reed 81 and the electron gun 2 from each other, thereby preventing the potential of the electron gun 2 from being disturbed by the electron beam passing through the getter reed 81.

However, since the getter reed 81 is charged with static electricity when it floats in the CRT, thereby affecting the direction of electron beam propagation, a part of the getter reed 81 is in contact with the The inner conductive coating 8 of the funnel portion of the CRT has electrical connection contacts. Therefore, when a part of the getter reed 81 is in electrical contact with the inner conductive coating 8, the electron beams are usually shot onto the fluorescent screen.

A getter 92 supported by the getter reed 81 is disposed within the CRT. The getter 92 is heated by high-frequency heating from the outside of the CTR during the getter evaporative process of manufacturing the CRT.

During the transpiration process of the getter, the getter 92 is heated to a very high temperature by the high-frequency heating, and is vaporized. There is thus a danger that the contact portion of the funnel glass 1 a with the getter reed 81 will break.

In particular, when the temperature of the getter 92 installed (or stored) in the container 15 is measured, the temperature may be as high as about 1200°C. If the container 15 is in direct contact with the funnel glass 1a of the CRT component 1, the high temperature will cause breakage at the contact portion of the funnel glass 1a. In order to avoid breakage, the getter reed will float as described above, so that the container 15 will not be in direct contact with the funnel portion of the CRT member 1, and only the getter reed 81. The top portion 83 of the elongated portion 81a and the end portions 84a, 84b of its short portion 81c are in contact with the funnel glass 1a.

However, even with this configuration, the average temperature at the contact portion of the body funnel glass 1a with the getter reed 81 can reach about 740°C.

On the other hand, from the viewpoint of the thermal resistance of the funnel glass 1a, it can be confirmed that if the temperature of the contact portion of the funnel glass 1a in contact with the getter reed 81 increases so as to exceed 750°C, then, The funnel glass will break. Therefore, during the process of the getter transpiration process using the getter reed 81, the temperature applied to the funnel glass 1a during the process of the getter transpiration process (ie, about 740° C.) and the temperature The difference (ie, temperature margin) between the temperature (ie, 750°C) that the funnel glass 1a can withstand high temperature is only about 10°C. In fact, due to differences in CRT characteristics, the funnel can often be seen due to changes in factors such as the amount of getter, heating time, deviation of the placement position of the getter reed 81 or ambient temperature during the manufacturing process. Fracture of glass 1a.

In addition, since, as shown in FIG. 2C, the getter reed 81 and the container 15 are connected to each other by welding at both ends of the short strip portion 81c, the getter spring The sheet 81 and the container 15 will thermally expand at different rates due to being heated to different temperatures, sometimes deforming the getter reed 81 and, in the worst case, causing the getter reed 81 to deform at its welded portion. The place falls off from the container 15 described above.

An object of the present invention is to provide a getter reed assembly and a CRT using the getter reed assembly, and the getter reed can be used in the getter transpiration process during the manufacture of the CRT Very little heat is applied to the CRT assembly, the funnel glass of the CRT.

Another object of the present invention is to provide a getter reed assembly and a CRT using the getter reed assembly. In such a CRT, breakage of the funnel glass can be avoided without excessive modifications to the getter reed assembly and the CRT.

Yet another object of the present invention is to reduce the time required for making a getter reed, attaching the container to the getter reed, and placing the getter reed relative to the CRT, compared to the above configuration. required fee.

According to the first aspect of the present invention, the getter reed assembly includes: a container for storing a getter therein, and a getter reed for supporting the container, wherein by attaching a container to one part of the getter reed, attaching the container to the getter reed, and making point contact between the container and the getter reed at a point on the other part , thereby reducing the heat conduction to the getter reed in the getter transpiration process.

The getter reed assembly according to the second aspect of the present invention, wherein said getter reed is provided with a small hemispherical portion or protrusion at a point of said other portion, and is welded at said one portion by welding. The container is secured to the getter reed by slidably contacting the small hemispherical portion or protrusion at one point of the other portion, and by making the rest of the container attaching the container to the getter reed partially out of configuration with the getter reed, thereby making the difference in thermal expansion between the container and the getter reed negligible and allowing The amount of heat conducted to the getter reed during the getter transpiration process is reduced.

According to a third aspect of the present invention, a getter reed assembly placed in a cathode ray tube having a funnel glass and an electron gun, comprising: a container for placing a getter therein, and a getter reed sheet for supporting said container, wherein said getter reed has a small hemispherical portion or protrusion and a curved portion, wherein said getter reed is made of elastic material and shaped so that having a total angle greater than the angle of the inclined surface of the cathode ray tube funnel glass, and fixing said getter reed in said funnel glass by fixing it at one end thereof to said electron gun by welding, so that it extends at an interval along the inclined surface of said funnel glass, and by bringing it into contact with said funnel glass at one point at a curved portion provided at the other end of said getter reed, and wherein by using Welding connects the container to the getter reed at a position farther from the curved portion provided at the other end, and the small hemispherical portion or protrusion is provided at a distance from the other end. Provided on the other part of the getter reed closer to the curved portion, the container is slidably in contact with the small hemispherical portion or protrusion of the getter reed, and the container is connected to the on the getter reed, thereby negligible differences in thermal expansion between the container and the getter reed and reducing the amount of heat transferred to the getter reed during the getter evapotranspiration process .

According to a fourth aspect of the present invention, a cathode ray tube having a getter to be disposed in said tube body in a process of using a getter transpiration includes the above-mentioned plurality of getter reeds for supporting said getter One of the components.

The above-mentioned and other characteristics and advantages of the present invention will become more apparent through the following detailed description of the preferred embodiment of the present invention in conjunction with the accompanying drawings, wherein: in the accompanying drawings, the same reference numerals are used to indicate the same or similar parts . In said attached drawings:

Figures 1A to 1D schematically illustrate a getter reed, with Figure 1A showing a plan view of an unformed getter reed; Figure 1B is a side view showing a getter reed , used to explain the bending state of a formed getter reed; Fig. 1C is a sectional view showing in detail the part delineated by a dotted circle in Fig. 1A, and Fig. 1D is a sectional view showing The getter reed is taken along the line D-D' in Fig. 1A.

2A to 2D schematically illustrate a container and the above-mentioned getter reed, wherein, FIG. 2A is a sectional view of the container; FIG. 2B is a perspective view of the container containing a getter reed therein;

Figure 2C is a perspective view of the getter reed with the container attached thereto from behind, and Figure 2D is a perspective view of the container, getter reed and an insulating material assembled together;

Fig. 3 shows a sectional view of a cathode ray tube using the above-mentioned getter reed;

4 shows a cross-sectional view of a getter reed and a cathode ray tube using the getter reed according to an embodiment of the present invention;

5A to 5D schematically illustrate the getter reed, wherein, Figure 5A shows a plan view of the getter reed has not yet formed; Figure 5B shows the side of the getter reed Figure 5C shows a cross-sectional view of the getter reed along the line C-C' shown in Figure 5A; Figure 5D shows A sectional view of the getter reed taken along line D-D' in FIG. 5A .

6A and 6B are perspective and cross-sectional views showing the getter reed joint portion, respectively;

FIG. 6C is a characteristic graph showing the relationship between the interval of the bonding portion and the discharge initiation voltage;

7A to 7C schematically show the getter reed with the container installed, wherein, Figure 7A shows a rear view of the getter reed with the container installed; Figure 7B shows the installation There is a side view of the getter reed of the container, while Figure 7C shows a side view of a cathode ray tube with the getter reed installed;

8A and 8B are used to explain the shape of the getter reed obtained when forming the getter reed according to the present invention and the getter reed shown in FIG. 1, respectively;

9 is used to explain the assembly process of the cathode ray tube using the getter reed assembly according to the present invention; and

FIG. 10 is a flow chart showing the process of mounting the getter reed assembly to the cathode ray tube and the assembly process of the cathode ray tube.

A cathode ray tube (CRT) using a getter reed assembly according to the present invention will be described below with reference to the accompanying drawings.

First, briefly describe the getter reed assembly and the CRT according to the present invention.

FIG. 4 is a sectional view showing the main part of a color CRT (registered trademark) such as a single-gun three-beam color picture tube (Trinitron) according to this embodiment. Roughly, the CRT is composed of a panel portion, a funnel portion and a neck portion. The funnel portion and the neck portion are welded together at the neck weld portion. The funnel portion and the neck portion are commonly referred to as funnels.

As shown in FIG. 4, the CRT includes a CRT assembly 1 (also called "funnel glass") and an electron gun 2 disposed inside the neck portion. The electron gun 2 includes a first grid G ₁ , a second grid G ₂ , a third grid G ₃ , a fourth grid G ₄ , a fifth grid G ₅ and a focusing plate ( deflection electrode plate) 3. In a typical configuration of the CRT, the first grid _G1 and the second grid _G2 constitute a cathode lens, ie an object point forming region. The second grid _G2 and the third grid _G3 constitute a pre-focus lens (front-stage lens). The third grid G ₃ , the fourth grid G ₄ and the fifth grid G ₅ form a main focusing lens (main lens).

In the case of a Trinitron picture tube, said electron gun 2 inserted into its neck portion is a single electron gun. Electron beams emitted from the three cathodes KR, KG, and KB cross each other at the center of the main focusing lens, and then diverge from each other. The diverging electron beam is electrostatically or electromagnetically refocused through an aperture grid (designated 62 in Figure 9) as the color selection mechanism. Thereafter, they are focused to a point and impinged on a fluorescent screen.

A large number of electron lens configurations are known. A single main lens type electron lens using a single potential focusing (UPF) system will be described below. The third grid _G3 and the fifth grid _G5 are electrically connected by wires 5 . Anode voltage (high voltage) HV from an anode button (not shown) passes through an outer conductor 12a of a coaxial cable 12, a leaf spring 13 formed of a C-shaped metal plate connected to said outer conductor 12a, the inner conductor coated Layer 8, and a conducting contact 15 in contact with said inner conductor coating 8, are applied in this order to said third and fifth grids _G3 and _G5 .

The fourth grid G ₄ is supplied with a lower voltage ranging from 0 to several hundred volts to the wire 7 through one end formed by the stem 1c provided at one end portion of the neck portion. Thus, the third grid G ₃ , the fourth grid G ₄ and the fifth grid G ₅ constitute the main focusing lens of the UPF system.

The focusing device 3 is composed of two inner deflecting electrode plates 3a, 3b arranged oppositely and outer deflecting electrode plates 3c, 3d respectively arranged outside the inner deflecting electrode plates 3a, 3b. Said inner deflection electrode plates 3a, 3b are supplied with an anode voltage HV from said fifth grid G5 to which they are mechanically and electrically connected. The external deflection plates 3C, 3D are supplied with focus voltage CV by the anode button (not shown) and through the center conductor 12b of the coaxial cable 12 . The focus voltage CV is several hundred volts lower than the anode voltage HV.

The relationship between the CRT and the getter reed will be described in detail below. The above-mentioned CRT is provided with a getter reed 16 formed of a bar-shaped metal plate and having one end connected to one of said inner deflection electrode plates 3a, 3b (ie, inner deflection electrode plate 3b). The getter reed 16 has a container mounted on a portion near the other end of the getter reed 16 for mounting (or storing) a getter on (or in) the getter. The getter reed 16 is formed of two getter reed members 16 a and 16 b connected by an insulating material 21 . The getter reeds 16 extend along and above the slope of the funnel glass 1 a at intervals of about 2 mm, for example. The getter reed 16 extends on the other end side beyond a short portion beyond the attachment portion of the container 15, thereby making mutual contact with the inner conductive coating 8 covering the inner surface of the funnel portion of the CRT (see FIG. 7C ).

The getter reed 16 and the container 15 will be described in detail below. The getter reed is formed by forming a bar-shaped metal such as stainless steel SUS304 (elastic material). When the getter reed 81 as shown in Figure 1A is a cross shape, the getter reed 16 according to the present invention is a long rectangle (bar shape) and does not need to have a direction perpendicular to the elongated part. The short strip that extends upward. The getter reed 16 is thus simplified compared to the getter reed 81 shown in FIG. 1A . Similar to the container 15 shown in FIGS. 2A and 2B, the container 15 fixed on the getter spring 16 also has an annular concave portion (groove). The getter 92 is installed (or stored) in the concave portion.

The dimensions of the getter reed 16, container 15 and insulating material 21 used in this embodiment are described below. Of course, the dimensions described below may also vary depending on fundamental factors such as the characteristics of the CRT and the size of the CRT.

The getter reed 16 is made of SUS304 (spring material), and its size is 114.2mm (length)×4mm (width)×0.25mm (thickness). The container 15 is made of SUS304, and its size is 21φ (outer diameter)×13φ (inner diameter)×2 mm (height). The insulating material 21 is made of alumina ceramic material, and its size is 15mm (length)×4mm (width)×1.8mm (thickness).

As shown in FIG. 5A, the getter reed 16 is divided into two getter reed members 16a at a position 27 close to one end of the inner deflection electrode plate 3b by a suitable means such as welding. and 16b. Similar to the getter reed 81 shown in FIG. 1A, the two getter reeds 16a and 16b are connected together using the insulating material 21, thereby electrically insulating them from each other.

The insulating material 21 is formed of an alumina insulating material similar to the insulating material shown in FIG. 2D. As shown in Figure 6B, the insulating material 21 has holes 23a and 23b defined thereon for receiving hollow rivets 22a, 22b, and protrudes from one of its upper main surfaces and is respectively arranged in the holes 23a, 23b. Conical convex domes 24a, 24b on the outside of 23b.

The two getter reed members 16 a and 16 b constituting the getter reed 16 have holes 25 a , 25 b defined in end portions thereof so as to be opposed to the holes 23 a , 23 b in the insulating material 21 , respectively. The two getter reed members 16a and 16b have engaging holes 26a, 26b defined at their end portions, respectively, so as to be able to engage with the convex protrusions 24a, 24b of the insulating material 21, respectively. As shown in FIG. 6A, the getter reed members 16a, 16b are disposed on one main surface of the insulating material 21 with an interval D between their end portions. At the same time, the convex protrusions 24a, 24b of the insulating material 21 are engaged with the engaging holes 26a, 26b of the getter reed members 16a, 16b, respectively. As a result, the holes 23a, 23b of the insulating material 21 are positioned so as to align with the holes 25a, 25b of the getter reed members 16a, 16b, respectively.

As shown in FIG. 6B, in the above state, hollow rivets 22a, 22b made of aluminum are respectively inserted into the holes 23a, 23b of the insulating material 21 and the getter from the rear surface of the insulating material 21. In the holes 25a, 25b of the reed members 16a, 16b. Then use appropriate pressure to rivet the rivets 22a, 22b from the side of the getter reed 16 .

According to this connection method, when the two getter reed members 16a, 16b are connected together, the rivets 22a and 22b are riveted and the convex protrusions 24a, 24b are engaged with the engaging holes 26a. , 26b are meshed. Therefore, the getter reed members 16a, 16b can be securely fixed to the insulating material 21 only by the rivets 22a, 22b. Thus, the getter reed members 16a, 16b can be prevented from rotating relative to the insulating material 21 . Since the convex protrusions 24a, 24b of the insulating material 21 are tapered, even in the case where the dimensions of the engaging holes 26a, 26b of the getter reed members 16a, 16b are slightly changed, The so-called convex protrusions 24a, 24b can also be firmly fitted into the engaging holes 26a, 26b.

While the interval D between the getter reed members 16a, 16b on the insulating material 21 is preferably the narrowest to prevent the surface of the insulating material 21 from being charged, the interval D should be greater than a certain length to avoid discharge along the surface between the getter reed members 16a, 16b. In this example, the interval D is set to be about 5 mm. However, if a lower voltage is used according to the difference in CRT characteristics, the interval D can be further reduced. The characteristic curve of FIG. 6C shows that the spacing D (mm) between the getter reed members 16a, 16b of the getter reed 16 is different from that when the getter reed members 16a, 16b are spaced apart. is the relationship between the discharge initiation voltage (KV) obtained when D is placed on the insulating material 21 . The interval D is appropriately determined based on the measurement result of a characteristic curve showing the relationship between the interval D and the discharge initiation voltage.

Said insulating material 21 is preferably arranged at said portion as far as possible from said container 15 in order to avoid damage of said insulating material 21 by vaporized getter scattered by getter evaporative evaporation. Thus, in this embodiment, said getter reed 16 is divided into said getter reed members 16a, 16b at a position 27 close to said inner deflection electronics board 3b of said electron gun 2, said The getter reeds 16a, 16b are connected by the insulating material 21.

After using the insulating material 21 to combine the getter reeds 16a, 16b together, one end of the getter reed member 16b is fixed to the end of the electron gun 2 by an appropriate method such as welding. on the internal deflection electrode plate 3a or 3b.

When the getter reed 16 is placed within the funnel portion of the CRT, the getter reed member 16a attached to the insulating material 21, in a plurality of bent positions I, II, III , Ⅳ, Ⅴ, Ⅵ and Ⅶ are successively bent into angles of 10°, 20°, 20°, 20°, 15°, 11° and 3° in sequence, as shown in Figure 5B, so that it follows the CRT The inclined surface of the funnel part of the assembly 1 extends.

As shown in FIGS. 5A and 7A, a width portion 28 of about 4 mm wide may be formed at a portion between the bent portion VI and the bent portion VII of the getter reed member 16a, so that the getter reed member 16a may be formed by a suitable method such as welding. The said container 15 is installed on the said getter reed 16. For example, when the width of the getter reed 16 is about 4 mm, the width of the width portion 28 is about 5 mm. From the portion slightly offset from the width portion 28 to the engaging portion on the getter reed member 16a to the width portion, a line along the width of the getter reed member 16a as shown in FIG. 5C as a cross-sectional view can be provided. The lengthwise extension of the getter reed member 16a is a concave portion or groove 22 to improve the bending strength of this portion of the getter reed 16 .

At a portion slightly offset from the curved portion VII to the end portion, a small hemispherical portion (or protrusion) 23 protruding toward the bottom surface 15a of the container 15 with a radius of about 1 mm, for example, is formed. The small hemispherical portion 23 may be formed by pressing out an appropriate protrusion from the rear surface of the getter reed 16 when forming the getter reed 16 by punching. The spacing or space S (see FIG. 7A ) between the small hemispherical portion 23 and the width portion 28 is substantially equal to the average of the outer and inner peripheral diameters of the annular container 15 . Therefore, when the bottom surface 15a of the container 15 is positioned on the width portion 28, except for the small hemispherical portion 23 and the portion of the width portion 28 deviated from the container 15, the small hemisphere The apex of the shaped portion 23 is in contact with the bottom surface portion 15a of the container 15. In the case of such a positioning relationship between the getter reed 16 and the container 15, as shown in FIG. 7A, using an appropriate method such as welding, at two positions 41a, 41b near the widthwise end portion And the container 15 is fixed to the width portion 28 of the getter reed 16 at a substantially central portion in a direction perpendicular to the width direction. The bottom surface 15a of the container 15 and the small hemispherical portion 23 of the getter reed 16 are in slidable contact with each other. Therefore, even when thermal expansion occurs at different rates between the getter reed 16 and the container 15, deformation of the getter reed 16 or unnecessary stress can be prevented.

As shown in FIG. 7C, compared with the getter reed 81 shown in FIG. 1A, the getter reed member 16a further extends from the portion where the container 15 is installed. The getter reed member 16a has a curved portion 24 formed at its top end. The curved portion 24 is in contact with the inner conductive film 8 coated on the inner surface of the CRT at one point. The total length of the getter reed 16 according to the present invention is about 8mm longer than the total length of the getter reed 81 shown in FIG. It is bent at seven bent positions, thereby slightly increasing the total angle of the bent positions. Therefore, even with only one contact, the getter reed 16 of the present invention can be securely fixed on the CRT.

A method of manufacturing the getter reed 16 and a method of mounting the getter reed 16 to the CRT will be described below. In order to manufacture the getter reed 16 inexpensively with an improved work efficiency, the getter reed 16 is obtained by, for example, punching and forming SUS304 (spring material) having a thickness of 0.25 mm. Preferably, the small hemispherical portion 23 and the curved portion 24 and the concave portion 22 extending along the length direction of the getter reed 16 are formed at the same time of stamping.

Since the getter reed 81 shown in FIG. 1A is a cross type, and the getter reed 16 according to the present embodiment is basically a rectangle (strip) without using the short strip portion, so it can be effectively used. the material. The getter reed can be made using about 1/3 the amount of material. Therefore, the getter reed of the present invention can be produced inexpensively from the viewpoint of material cost. When manufacturing the getter reed 81 , the getter reed 81 cross-cuts the material as shown in FIG. 8B so as to save the material. However, if this is done, the getter reed 81 is bent due to the heat generated in the getter transpiration process. On the other hand, according to the getter reed 16 of the present embodiment, the material is cut perpendicular to the width direction of the material as shown in FIG. 8A , so the getter reed 16 according to the present embodiment avoids a The problem of bending during the evapotranspiration process.

The manner in which the getter reed 16 is mounted on the CRT will be described below with reference to FIGS. 9 and 10 .

On the inner surface of the panel 61, a phosphor slurry is applied and developed (Fig. 10 process 711), then an intermediate layer is applied thereon (process 712), and then a A reflective film formed of an aluminum film is evaporated thereon to form a metal back (step 713). An aperture grid is assembled (operation 714).

A separately fabricated funnel 63 is attached to the panel 61 (process 715) and fixed to said panel 61 by melting and crystallizing a frit (solid glass) on the joining surface (process 716).

The getter reed 16 is connected to the electron gun 2 (operation 714). The electron gun 2 is placed in the neck portion 64, and a stem portion and the neck portion 64 are sealed (process 717). The CRT assembly is vented and evacuated (operation 718).

After the exhaust process 718, in a getter transpiration process (process 719), the interior of the CRT assembly is kept in a high vacuum state.

An aging process (process 720) and an inspection process are performed. Thus, the installation process of the CRT is completed.

In the above-mentioned getter evaporation process, the getter installed on the container 15 is heated and evaporated by a high-frequency heating device 41 (shown in FIG. 7C ) installed outside the funnel. Barium Ba (getter) is evaporated to the inner surface of the CRT module to form a film. In the aging process, if the voltage is applied to the first and second grids G ₁ and G ₂ while the heater is energized, and current flows through the cathode, Then the gas remaining in the CRT assembly is easily absorbed by the getter placed in the CRT processed by the getter transpiration process, so that the inside of the CRT assembly is kept under a high vacuum state.

The function and action of the getter reed according to the present invention will be described below.

The biggest feature of the present invention is to avoid the conduction of the heat generated during the evaporation of the getter to the funnel glass as much as possible.

As shown in FIG. 7B, a heat barrier layer is formed on the surface where the container 15 mounted with the getter 92 and the getter spring 16 are in contact with each other. Especially in the state where the position 41a, 41b of the width portion 28 is fixed on the bottom surface 15a of the container 15 by welding, the getter reed 16 supports the container 15, and the small hemispherical The top end of part 23 is in contact with said point 41, while the other part thereof is not in contact with it. With this arrangement, even if the getter 92 stored in the container 15 is heated to a very high temperature, namely about 1200° C., by high-frequency heating from the outside of the CRT assembly, the There is also a space between the container 15 and the getter reed 16 other than the point contact portion 23 which serves as a heat barrier. Through the evacuation process, the space is kept in a vacuum state, thereby avoiding transfer. Therefore, heat is not conducted therebetween. However, since the contact portion described therebetween is limited to the above-mentioned welded portion and point contact portion. Therefore, it can also be considered that the heat conduction therebetween is reduced. In particular, since the point contact portion is only a very small area, rapid conduction of a large amount of heat can be avoided.

The length of the heat conduction path is designed as shown in Fig. 7C. In particular, when the heat is applied along the length direction of the getter reed 16 from the welding positions 41a, 41b to the curved portion 24 (herein, the getter reed 16 and the When the funnel glass 1a of the CRT assembly 1 mentioned above is in contact with) conduction, the heat conduction channel is very long. Therefore, it can be expected that the temperature at said curve portion 24 is relatively low. Although, another heat conduction passage from the bottom surface 15a of the container 15 through the small hemispherical portion 23 to the curved portion 24 is relatively short, but the bottom surface 15a and the small hemispherical portion 23 only contact each other at a point with a very small area. Therefore, the other heat conduction channel is difficult to quickly conduct a large amount of heat.

In addition, since the curved portion 24 provided at the front end of the getter reed 16 has a convex curve, the getter reed 16 and the funnel glass 1a are formed at only one point. in contact with each other. Therefore, the contact area between them is limited.

Since the heat radiated directly by the getter 92 and the container 15 is very small compared to the heat conducted through the getter reed 16, the amount of heat radiated can be ignored.

The effect of the getter reed 16 according to this embodiment will be described below.

When the getter reed 16 according to the present invention is used, at the contact surface between the curved portion 24 of the getter reed 16 and the funnel glass 1a, measured during the getter evapotranspiration process The temperature is about 640°C, and the temperature value is the average value of the measured values. When the getter reed 81 shown in FIG. 1A is used, the measured temperature value at the contact surface of the getter reed 81 and the funnel glass 1a is about 740° C., which is also the average value of the measured values. It can be understood from the comparison results that the temperature obtained when using the getter reed 16 is about 100° C. lower than that obtained when using the getter reed 81 . Also, since the temperature at which the funnel glass 1a can withstand being heated is about 750°C, the difference between said temperature and the above average (ie 740°C) obtained when using the getter reed ( temperature margin) is only about 10°C. However, when using the getter reed 16 according to this embodiment, there is a difference between the temperature at which the funnel glass 1a can withstand being heated and the average value obtained when using the getter reed 16 (ie, 640°C). increased to 110°C. Therefore, even if the above-mentioned temperature difference (ie, about 110° C.) is reduced due to some factors such as the difference in the characteristics of the CRT and the variation in the manufacturing process, it is still possible to provide a funnel glass 1a in which the A CRT that does not break even in the getter evapotranspiration process.

According to this embodiment, said container 15 is fixed on a part of said getter reed 16 and is slidably supported by the getter reed 16 at a point of contact. Therefore, even when the getter 92 is heated to the temperature of the getter transpiration process and the container 15 in which the getter 92 is placed is heated to a temperature relatively higher than that of the getter reed 16, due to the Due to the difference in thermal expansion between the reeds 16 and the container 15, the getter reeds 16 will not be deformed, and they will not come off each other at their welded parts.

According to described getter reed 16 and the CRT that uses this getter reed 16, just can solve the problem that breakage occurs on the funnel glass 1a of described getter reed 81, and make described CRT use not to all The configuration of the getter reed 81 and the CRT use the same configuration of the getter reed 81 and the use of the getter reed with too many modifications to the arrangement of the getter reed 16 described above, and only need to simply change the shape of the getter reed 81 to be a getter Reed 16 shapes are just passable.

According to this embodiment, while the getter reed 81 has a short strip portion extending perpendicularly to its length direction, the getter reed 16 does not have such a short strip portion. Therefore, compared with the getter reed 81, the getter reed 16 can save 1/3 of the material (see FIG. 8A ) and reduce the material cost.

According to this embodiment, when the getter reed 81 is welded to the container 15 at two locations (see FIG. 2C ), the getter reed 16 passes through two locations on one part. At the same time welded to be welded to the container 15 (see Figure 7A). Therefore, manufacturing cost can be reduced. The small hemispherical portion 23, which is in contact with the bottom surface 15a of the container at a point of contact, may be formed at the same time as the getter reed 16 is cut from the material.

Some modifications made to this embodiment will be described below. While the getter reed 16 and the CRT using the getter reed 16 according to the present invention have been described so far, the present invention is not limited by the above embodiments, and the principles of the present invention can also be applied to the following modifications.

For example, while applying the present invention to the particular type of CRT used in the above-described embodiments, the present invention is not limited thereto, and the present invention can be applied to any type of CRT treated using the getter evapotranspiration process to Improve the vacuum state inside it.

In the above embodiment, one end of the getter reed 16 is fixed to the inner deflection electrode plate 3 b of the electron gun 2 . However, the present invention is not limited thereto. The getter reed 16 can be fixed at any part inside the CRT. For example, the getter reed 16 can be fixed on any appropriate part of the electron gun 2 .

The getter reed 16 is welded to the container 15 at one portion including two locations and connected to the container 15 at the other end portion as a contact. But the present invention is not limited thereto, since the purpose of the present invention is to reduce the heat conduction between them. Even if the getter reed 16 is welded to the container 15 at only one position within the width portion 28 of the getter reed 16 provided with a sufficient width, the container 15 can be reliably secured. fixed to the getter reed 16. Instead, the getter reeds 16 may be welded to the container 15 at three or more locations, if desired.

As mentioned above, the getter reed 16 is in contact with the container 15 at a point of the ball portion (or protrusion) 23, but the present invention is not limited thereto. The getter reed 16 may be in contact with the container 15 at one point. This contact can be achieved by suitably shaping either or both of the getter reed 16 and the container 15 . For example, the small hemispherical portion (or protrusion) 23 is not formed on the getter reed 16, but is formed on the bottom surface 15a of the container 15 with the flat sheet getter reed 16. The small hemispherical part 23 mentioned above. In addition, if one of the getter reed 16 or the container 15 is provided with a chevron-shaped convex portion extending a suitable length, and the other is provided with a chevron-shaped convex portion extending in a direction perpendicular to the chevron-shaped convex portion. A convex portion of the length, then the getter reed 16 and the container 15 contact each other at one point. In this embodiment, they contact each other at one point, but the present invention is not limited thereto, and the number of contacts is not limited to one. In the present invention, it is sufficient as long as the contact between them is effective. They can touch each other at two or more points.

In this embodiment, the spoon-shaped curved portion 24 provided at the front end portion of the getter reed 16 is in contact with the funnel glass 1a, but the present invention is not limited thereto.

The present invention only needs to reduce the area of the contact portion between the getter reed 16 and the funnel glass 1a, and any shape and design of the getter reed 16 that can reduce the area of the contact portion can be considered.

In consideration of some necessary factors of the special type of CRT that the present invention needs to be applied to, such as the temperature that the funnel glass can withstand being heated, the temperature of the getter reed in the getter transpiration process, the CRT characteristics The above-mentioned changes and modifications may be arbitrarily carried out under the conditions of the determined temperature range, manufacturing cost, and the like.

According to the CRT of the present invention, the quality of the CRT can be improved because the CRT uses the getter reed capable of reducing heat conduction in the getter transpiration process.

In accordance with the present invention, breakage of the funnel glass as described can be avoided without substantially modifying the getter reed 81 shown in FIG. 1A and a CRT using the same reed, resulting in a greatly increased yield of manufactured CRTs.

In addition, according to the present invention, compared with the getter reed 81 shown in FIG. 1A and a CRT using the getter reed, the manufacturing cost can be reduced.

The preferred embodiments of the present invention have been described with reference to the accompanying drawings, it should be understood that the present invention is not limited by the above embodiments, and without departing from the spirit and scope of the present invention defined by the appended claims, Various changes and modifications can be made by those skilled in the art.

Claims (4)

1. A getter reed assembly, comprising: a container in which to store a getter, and a getter reed for supporting said receptacle, wherein said receptacle is attached to said getter reed by securing a receptacle to a portion of the getter reed, and said receptacle and The getter reed is in point contact at one point of the other part, thereby reducing the amount of heat conducted to the getter reed during the getter transpiration process. 2. The getter reed assembly according to claim 1, wherein said other portion of said getter reed is provided with a small hemispherical portion or protrusion at a point, and the getter reed is welded at said one portion by welding. Said container is secured to said getter reed by having said container slidably contact said small hemispherical portion or projection at one point on said other portion, and by making the remainder of said container attaching the container to the getter reed out of configuration with the getter reed, thereby making the difference in thermal expansion between the container and the getter reed negligible and reducing The heat conducted to the getter reed during the getter transpiration process. 3. A getter reed assembly for placement in a cathode ray tube having a funnel glass and an electron gun, comprising: a container in which to place a getter, and a getter reed for supporting said container, wherein said getter reed has a small hemispherical portion or protrusion and a curved portion, wherein said getter reed is made of elastic material and shaped so as to have a total angle greater than the angle of the inclined surface of the cathode ray tube funnel glass, and fixed to the electron gun by welding the getter reed at one end thereof to the electron gun in the funnel glass so that it extends at an interval along the inclined surface of said funnel glass, and by bringing it into contact with said funnel glass at one point at a curved portion provided at the other end of said getter reed, And wherein the container is connected to the getter reed at a position far from the curved portion provided at the other end by using welding, and the small hemispherical portion or protrusion is provided at a distance from the curved portion provided at the other end. On the other part of the getter reed that is closer to the curved portion provided at the other end, the container is slidably in contact with the small hemispherical portion or protrusion of the getter reed, and the The container is attached to the getter reed, thereby negligible differences in thermal expansion between the container and the getter reed, and reducing heat transfer to the getter during the getter evapotranspiration process Reed heat. 4. A cathode ray tube having a getter disposed within its cathode ray tube assembly for use in a getter evapotranspiration process, comprising: The getter reed assembly for supporting the getter according to any one of claims 1 to 3.

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