CN85104991A - Improve the method for cathode ray tube explosion-proof performance and the product that obtains thus - Google Patents

Abstract

Be suitable for having the coating of the sticky matter of one deck inherent viscosity around the inner surface of the ruggedized construction (25,26) of the screen dish (12) of cathode ray tube (10).When the ready for reinforcing cathode ray tube, this ruggedized construction with this viscosity coating facing to the screen dish and place on the position around the screen dish.

Description

Improve the method for cathode ray tube explosion-proof performance and the product that obtains thus

The present invention relates to a kind of new method that improves the cathode ray tube explosion-proof performance, and a kind of novel cathode ray tube made from this new method.

A kind of cathode ray tube is made of the shell of finding time that comprises a glass screen dish, and this screen dish has edge or the sidewall that extends back.Atmosphere at screen outer surface applies the pressure that adds up several tons (thousands of kilograms) to panel.If the screen dish breaks, this power will be shifted fragment in the cathode ray tube onto, and fragment can bounce or the screen dish of continuation by breaking, and causes personnel's injury on every side.

In order to provide a kind of explosion-proof performance better cathode ray tube, propose, come around the screen dish with the ruggedized construction of metal or plastics, if break generation, this ruggedized construction will make edge or sidewall remain on original position.In some mode, with glue ruggedized construction is sticked on the cathode ray tube, and can comprise or can not comprise a metal tape around the tension of screen dish.

In the former assembling process, be coated onto on the part of ruggedized construction controlling the glue of quantity well.When glue was thickness, promptly glue full solidification or when being got wet not was placed on part on the cathode ray tube.Only be partly solidified and glue is only the occasion of thickness, under the situation of using epoxy resin, gluing and metal parts is placed on the picture tube and should carries out simultaneously.And the character of glue can cause the glue of some to be seeped on the face glass of screen dish, and this must dispose with hand again, just needs the operation of an additional effort.Just to make glue be the occasion of thickness in that glue is got wet, then must utilize organic solvent to produce this viscosity.Must strengthen the bonding of glue except that desolvating subsequently, and glue also no longer is thickness.These two kinds of operations have brought appreciable cost and have needed to ventilate and suitable environment control.

According to the present invention, the ruggedized construction that provides one to be suitable for around cathode ray tube is provided the new method that improves the cathode ray tube explosion-proof performance.The inner surface of ruggedized construction has the cover layer of the adhesive material of one deck inherent viscosity.When the ready for reinforcing cathode ray tube, ruggedized construction is around this cathode ray tube, and with the viscosity cover layer facing to and press to this cathode ray tube.Viscosity keeps and adheres to for ruggedized construction and not produce injurious effects on the screen dish.New product according to the present invention is a kind of like this cathode ray tube, and it has one around the ruggedized construction of this cathode ray tube and inherent viscosity adhesive material of between.

The viscosity cover layer of going up generation in situ is one and is coated onto the ruggedized construction inner surface, the aqueous emulsions thin layer of the sticky matter reacted constituent that is dried subsequently.This emulsion is normally highly acid, and pH value is 2.0 to 4.0.Ruggedized construction can produce the metal of corrosion when normally being existed by acid medium, typically, is the steel framework frame plate that has comprised around cathode-ray tube blanking disk.This corrosion makes glue be broken away from by the metal surface.In new method, the pH value of having adjusted emulsion does not have injurious effects up to about 7.0 to 8.0 to the quality that thin layer adheres to, and ruggedized construction is not produced corrosion simultaneously.

By providing one the tectal ruggedized construction of glue dried, inherent viscosity, that apply is in advance arranged, can obtain many benefits.The step of gluing and assembling is separated in time with on the space.Can use glue more economically, and need to glue ooze out and the situation about clearing up that flows has reduced.Can avoid adding sticking coating and dry again subsequently its operation again with organic solvent.Can enough aqueous emulsions produce the glue coating of inherent viscosity, thereby can from installation step, remove the use of organic solvent from.

In the accompanying drawings.

Fig. 1 is the perspective view according to a novel cathode ray tube of the present invention;

Fig. 2 is the fragmentary section views along the amplification of the part of the resulting cathode ray tube of 2-2 line of Fig. 1; And

Fig. 3 is a parts explosion, and it has shown each part that is used in the indicated cathode ray tube of shop drawings 1 and Fig. 2.

In the preferred embodiment that shows in Fig. 1 and Fig. 2, a cathode ray tube 10 comprises a shell of finding time 11.Shell 11 comprises a screen dish 12, the pipe that neck 14 is connected with awl 15.Neck 14 seals at its far-end with stem stem 17, and an electron gun (not shown) is installed in the neck 14 also to be linked on the pin one 8, and this electron gun is supported by stem stem 17, and is outwards connected by stem stem 17.Neck 14 is right after and is sealed to a little end of pipe awl 15.

Screen dish 12 comprises panel 19 and a side wall glass or flange 20 as a whole, that extend back around panel 19 continuously of a glass.Screen dish 12, is right after and is sealed on the wide end of pipe awl 15 along sealing-in line 21 at the place, end of flange 20.Phosphor screen 22 is to be positioned on the inner surface of panel 19.

The inside of shell is pumped to 10 ^-5The high vacuum of the millimeter of mercury order of magnitude.In the present embodiment, for a 19V rectangle chromoscope, the atmospheric pressure that is pressed on the panel outer surface has applied the power that amounts to about 2 tons (about 1814 kilograms).The peripheral tension stress of (about 70 kg/cm) appears on flange 20 and the adjacent funnel portion up to 1,000 pound per square inch.

A metal reinforced structure 23 is being wrapped screen dish 12 around the periphery of the flange between sealing-in line 21 and the panel 20.This ruggedized construction 23 comprises two semicircle metal frame frame plates 25 and 26.The glue 27 of these frame plates and inherent viscosity is added on the flange 20 together.Continuous metal tape 28 place between mould interface line 24 and the panel 19 frame plate 25 and 26 above.With 28 being the states that are in tension, its end overlap joint and be pressed with groove with clamping element 29. Frame plate 25 and 26 is pressed screen dish 12 and is shaped, and making only needs the glue 27 of minimum thickness and provide a solid basis of putting forth effort for pull strap 28.

The preferred embodiment that shows among Fig. 1 and Fig. 2 can be assembled according to following program with reference to figure 3.A kind of 19V trichromoscope 10 complete and practicality is provided, the frame plate 25 and 26 of a metal tape 28 and two U-shapeds also is provided, the very little semicircle screen dish 12 of picture tube therewith of the profile of these two frame plates and R adapts.Metal tape is that width is about the 18.3mm(0.75 inch), and thickness is about the 0.5mm(0.020 inch) the carbon steel arrowband.Frame plate 25 and 26 each all be to make by the cold-rolled steel of drawing.Know that the cold-rolled steel part is having acid medium.More specifically, corroded having under the situation of water-bearing media.Frame plate 25 and 26 inner surface (predetermined will facing to those faces of screen dish) be covered with aqueous emulsions and dry it subsequently, this emulsion has the reacted constituent of the gluing material of acrylic acid of inherent viscosity, following component is mixed according to the share of being shown out with weight just made a kind of suitable emulsion:

（1）Valtac QT（Vaichem、Langley，S.C.）。

A kind of aqueous polymerization emulsion ... 400

（2）Valthick（Valchem.Langley.S.C.）

A kind of aqueous acidic latex thickener of cross-bond acrylate copolymer ... 16

（3）Triton GRS 5（Rohm & Hass.Phila.PA）

A kind of additional humidizer is to improve bonding force and adhesive force ... 0.1

(4) NaOH, a kind of additional alkali reaches about 7.3 with the pH value of adjusting mixture ... 10

This emulsus intermixture is thixotropy, and pH value is about 7.3 and about 68,000 centipoises of viscosity.This mixture is heated to about 80 ℃ (180 °F) and is being sprayed under the stuffy condition on the inner surface of frame plate 25 and 26 subsequently, and its width is about the 15mm(0.1 inch) the about 2.5mm(0.10 inch of thickness), subsequently at air drying.Moisture in the evaporation coating makes its drying, and composition wherein forms cross-bond in situ, at room temperature, has formed gluing coating 27 water white, inherent viscosity after about 15 to 30 minutes.Be preferably in spraying back and metal plate is heated to about 100 ℃ quickens drying in radio-frequency furnace, make bone dry in less than 15 seconds time.As shown in Figure 2, glue coating 27 is at the crimp of frame plate 25 reverse side at edge 30 in other words.The narrowest some place on the frame plate angle, the width of glue coating 27 is about the 20mm(0.79 inch), and at the wideest some place at about middle part of frame plate, wide about 38mm(1.5 inch).

When the ready for reinforcing cathode ray tube, frame plate 25 and 26 is pressed onto over against the position of the screen dish 12 of cathode ray tube 10.Can be expressed to glue coating 27 in the frame plate 25 and the space between the sidewall 20 that shows among Fig. 2, but not be seeped into outside the frame plate 25.Metallic plate 28 is around frame plate 25 and 26, is tightened up and is pressed with groove with clamping element.Metal tape can be with authorizing Bao Weier people's such as (D.E.Pooweii) United States Patent (USP) NO.3, method location described in 220,593 and folder groove.Other method is with authorizing special lachs (A.M.Trax) people's of etc.ing United States Patent (USP) NO.3, the method location of describing in 162,933 and welding.Metal tape 28 is fixed on the appropriate location to frame plate 25 and 26, and simultaneously, the glue coating has been strengthened the intensity between glass screen dish and the frame structure subsequently.The glue coating 27 of inherent viscosity is to pressure-sensitive.Being enough to produce one with 28 pressure that produce is firm preliminary the connection for glass screen dish and metal framework.

So the cathode ray tube of gained can bear the strike that screen dish 12 is subjected to, such as imploding of producing when being the impact of 15 foot-pounds (about 2 kg-ms).If screen dish 12 breaks.Air will be rushed in and destroy vacuum in the cathode ray tube, but shell 11 will can not collapse, and glass fragment by panel forward, the distance of dishing out to the beholder can not seen fixed distance greater than Underwriters Laboratory test (the Underwriters Laboratories Test) NO.1418 by standard.

Usually, the present invention can any Xi Wang of Yong Yu the essential Yin extreme ray pipe of reinforcing maybe, Yi improves its explosion-proof ability. For example, the Yin extreme ray pipe of reinforcing can be Yi oscilloscope tube or Yi display tube. The maximum application of the Yin extreme ray pipe of reinforcing is to Yong the Yu trichromoscope. During the standby installation of developing pipe Zai Zhun ruggedized construction, Yi is through finishing processing and can supplying practical.

Ruggedized construction can be any Xing formula or the configuration of Xian You technology Yi Zhi, wherein, is adhered on the screen dish around the structure of screen dish. For example, Zai authorizes the people's such as Bao Weier (D.E.Powell) United States Patent (USP) NO.3, discloses this structure Zhong in the of 220,593. Zai Zhe the sharp Zhong of Zao Xian Zhuan, glue is epoxy resin or other self-curing or heat reactive resin. This glue Yao be asked, and Zai glue Yi solidifies Before the Zhi, in the time of glue or thickness, ruggedized construction is installed on the Yin extreme ray pipe. After Zai solidified Yi, glue lost Nian. The method Zhong of Zai Xin, pellicle be cured as in situ inherent viscosity and be the glue that the Yong Kubo is held Nian, after Yu was Zai curing, ruggedized construction was installed on the Yin extreme ray pipe. Yin this, this Xin method of Yong, ruggedized construction not Xu Yu only keep the glue Yi of Nian to play installation by partly solidifying in the Zai setting up period. Zai authorizes the United States Patent (USP) NO.3 of Alexandre Desplat (R.B.Platt), discloses the similar method of Yi Zhong Zhong in the of 845,530, and wherein, glue is the agent of Nian knot and the Yi Zhong filler of Yi Zhong rubber-based, and it can be overlayed on the frame plate, and be dried become noncohesive. Only Zai is added to You machine solvent on the glue before the Zhi being installed to ruggedized construction on the Yin extreme ray pipe, makes coating recover Nian. Rubber-based Nian knot agent Zuo Wei Yi Zhong sticky plaster is sold, and it comprises Yi Zhong or multiple You machine solvent, for example toluene, trichloro-ethylene, chloromethane, and Zhe Xie solvent can make coating recover elasticity by Yong. Zai ruggedized construction is installed to after the Zhi Yin extreme ray pipe, by removing the You machine solvent of coating Zhong, makes adhesive curing and no Nian. Zai Xin method Zhong, the coating of curing is inherent viscosity, it not Xu Yao tackify or recover Nian. Yu is, this Xin method of Yong is installed during the glue Yi of this ruggedized construction discord solvent tackify plays Zai solvent Zheng and sends out. Yu is, the glue that Zao Xian uses is intrinsic non-sticky glue, and the interim feature of the coating that its Nian Zhi just exists when to be Zai install ruggedized construction.

Run through presents, used phrase " adhesive material of inherent viscosity ", Yi just it Yu take before as Xiang with or the gluing types of material phase region that uses of similar applications other. Adhesive material before the Zhe Xie Yi is not inherent viscosity; And its product also is inviscid. Zai is only Yin the sticking occasion of the partly solidified ability of Wei, viscosity diminishes when Zai solidifies fully. The Zai solvent just sticking occasion of having got wet, viscosity diminishes after the Zai desolventizing. In the Zai two Zhong situations, final products have utilized intrinsic non-sticky adhesive material. The method and structure Zhong of Zai Xin, inherent viscosity Zhi amount of the adhesive material of use not only is different from Zhe Xie Zao Xian material, and has brought some benefit. Give glass and metal surface generation more Xun speed be not easy to come unstuck with more firmly connecting. In addition, Yin inherent viscosity of glue, it is not subjected to the Ying Xiang of viscosity change, and the Zhe variation is the variation Zao one-tenth Yin the actual installation program of factory . Also have, Yin Wei this intrinsic Nian be Yong of a specified duration, to being indeclinable feature, factory can more save material, labour and equipment than Yong Xian You method.

In the production of new product, the glue of inherent viscosity can be gone up in situ by the water-based emulsions that wherein has reacted constituent and produce.Yet,, suitable viscosity and pH value must be arranged in order successfully to use a kind of like this emulsion.Basic emulsion is a kind of low viscous acidic liquid of emulsus, and it can obtain from several commercial sources.One group of emulsion is that trade mark is Valchem preferably, the Valtac series acrylate pressure sensitive adhesive of Langley.SC..Can there be the emulsion of similar characteristics to substitute with other.Can directly utilize emulsion.But, in order to improve performance.Need: (a) increase viscosity, make it possible to coat thicker coating, (b) increase pH value and reach at least 7.0, to reduce corrosion to metal reinforced structure, (c) adhesive force of increase adhesive material and glass and metal surface.

The common scope of the pH value of this emulsion is about 2.0 to 4.0.The acid medium that contacts with the steel part has caused the corrosion of piece surface, and or stops the gluing formation that is connected between metal surface and glue-line or damage this connection.For corrosion or the breaking-up that prevents gluing connection, the pH value of adjusting emulsion in 7.0 to 8.0 scope, preferably 7.0 to 7.5.Can in this emulsion, realize this adjustment by the aqueous solution that adds alkali or alkaline matter.Though can utilize other chemicals,, preferably use NaOH such as potassium hydroxide, ammonium hydroxide and lithium hydroxide.Comprise that carbonate or bicarbonate-based chemical substance can cause bubble, this can think undesirable in some applications.In addition, amino-contained and/or amino chemical substance can react with the metal surface of ruggedized construction.But, if do not comprise that metal is with regard to available these chemical substances.The pH value that improves emulsion is also influential to the raising (becoming sticky) of emulsion viscosity usually.

Can make the emulsion retrogradation by adding above-mentioned commercial thickener (Valthick 70).Can with other thickener be polyacrylate, cellulose derivative and vinylacetic acid fat.The inorganic thickener that can use is gluey silicon, clay filled agent, calcium carbonate and magnesium carbonate.After adjusting pH value at the beginning, the thickener that adds some is to be created in the viscosity in 10,000 to 70, the 000 centipoise scopes.Viscosity is big more, and the coating that can use is thick more, and moving of employed adhesive material is more little.Because the interval between ruggedized construction and the screen dish changes, the emulsion that is covered should have the 2mm(0.05 inch at least) thick, and when ruggedized construction was pressed onto its position, emulsion should adapt with above-mentioned interval.

Wetting agent can save or only add very little quantity, and reaching per 100 parts of emulsions has about 0.1 part of wetting agent, to increase the adhesive force of glue for glass and/or metal surface.Wetting agent can be anionic or cationic.

Can be overlayed on the emulsion that has comprised glue on the inner surface of ruggedized construction with any commonsense method.For example, can glue squeeze, the brush, be sprayed on this surface.In addition, can add the viscosity coating of doing with belt-like form, can be by hand or the machine mode, be added on the metal frame frame plate with the shape corresponding to one or more this band of frame plate.Emulsion can directly be layed onto on this surface with low-pressure by the matched closed container of nozzle of a drum or other and appropriate designs.The best viscosity of glue is definite by souning out.Viscosity will be easily made in exploration several times, under this viscosity, can glue be coated be covered with and be unlikely have on the surface unsuitable wandering.The glue coating can be overlayed on the whole width of ruggedized construction inner surface.Glue can be used as than the little a lot of fillet of whole width of ruggedized construction and uses.Subsequently the emulsion brush of preparation on the broad area of frame plate, but be slightly less than the whole width of plate.

Under mass-produced situation, the zone that is coated with emulsion must carefully be controlled, and only must be limited to the inside at frame strip.Adhesive material with any inherent viscosity on the frame plate outer surface can produce many problems, can need suitable cost to remove glue or that part of scraping of frame strip outside.In order to realize controlling preferably, preferably emulsion is heated to about 180 °F (80 ℃), subsequently, be sprayed on the desired zone on frame strip surface at the emulsion of stuffy following heating.By such method, can enough accurately control, the emulsion coating is only sticked on the total inner surface width of frame strip, and be so thin and evenly, make the phenomenon of oozing out that the glue coating does not take place when frame strip is installed on the cathode ray tube.

The glue coating is at room temperature dry in atmosphere, becomes viscosity, pressure-sensitive, transparent coating after about 15 to 45 minutes.Also can enough heating quicken drying.Must be careful, do not allow to allow the frame plate of coating behind the emulsion contact with each other, avoid frame plate to stick together like this and/or between plate, shift adhesive material, and these glue need be removed.At coating drying and after having formed coating viscosity, transparent, frame plate can be forced on the relevant position of cathode ray tube, and remains on there up to form preliminary connection between cathode ray tube and stiffening frame.This bonding intensity continues to increase, and reaches maximum in about 48 hours in the dry back of coating.

The present invention has following advantage:

1. its step of make applying coating can separate with the step that ruggedized construction is added to cathode ray tube, so permission has bigger flexibility in whole process.

2. this dried and glue that be inherent viscosity is not because the character of itself has or almost not have mobile tendency.Thereby, oozing out of glue do not taken place, so do not need cleaning process subsequently yet.

3. the adhesive with the epoxy resin type compares, and the glue of the inherent viscosity that uses among the present invention is not relatively detested by the millworker.

4. the glue coating of Ganing is because the character of its inherent viscosity is considered to littler than the tendency of coming unstuck of previously used intrinsic non-sticky glue coating.

5. compare with the glue of the rubber-based described in the patent of previously described Alexandre Desplat (Platt), new method has been removed from and has been recovered viscosity and dry step, and can avoid fully with an organic solvent and use aqueous emulsions to produce the glue coating of inherent viscosity.Water-based mixture does not need to ventilate or to the control of environment.

Each above-mentioned advantage than before method more likely reduce price, these advantages are as single or to integrate all be valuable.

Revisal 85104991

After the preceding revisal of the capable revisal of file name page or leaf

Specification 25 is gone up in situ ... at the scene

32 these electron guns by ... pin one 8 by

39 one 19V ... one 19 inches

3 22 ... 19V ... 19 inches

3 24 R cun ... size

4 19 ... in situ ... at the scene

4 21 ... about 100 ℃ are come ... 100 ℃ to come up

82 ... (0.05 inch) ... (0.08 inch)

Claims (15)

1, a kind of method that improves the explosion-proof performance of cathode ray tube, this cathode ray tube is made of a shell of finding time that has comprised a glass screen dish, and said method comprises:

A., a ruggedized construction that is applicable to around above-mentioned screen dish is provided, and the inner surface of this ruggedized construction has the viscosity cover layer of adhesive material, and this ruggedized construction is made of a kind of metal that can be corroded when the acid water medium exists and

B. above-mentioned ruggedized construction is located around said screen dish, with the inner surface of said viscosity coating facing to said ruggedized construction.

The feature of said method is that said adhesive material is a kind of organic polymer of going up the inherent viscosity that generates through the following steps in situ:

1. in the aqueous emulsions of the above-mentioned adhesive material reacted constituent of the inner surface of above-mentioned ruggedized construction lining one deck, the pH value of this emulsion is in 7.0 to 8.0 scope, and

2. at the above-mentioned coating of air drying, thereby above-mentioned reacted constituent forms cross-bond, produces the said viscosity coating (27) that invests this inner surface.

2, by the method that claim 1 limited, it is characterized in that said material organic, polymerization is a kind of acrylate glue adhesive material, it is produced by the reacted constituent in the acidic aqueous emulsion of routine.

3, the method that is limited by claim 2 is characterized in that, step 1. in, said emulsion is heated to about 80 ℃ (180 °F), is coated onto on the said ruggedized construction inner surface at stuffy following above-mentioned hot emulsion.

4,, it is characterized in that said emulsion comprises the thickener that is used for increasing this emulsion viscosity, and be used for increasing the humidizer of said cohesive material for concrete surface adhesion force by the method that claim 3 limited.

5,, it is characterized in that said emulsion applies with nonventilated spraying method by the method that claim 2 limited.

6,, it is characterized in that when the said emulsion of spraying, this emulsion remains under about 80 ℃ by the method that claim 5 limited.

7, by method that claim 2 limited, it is characterized in that, the pH value of said emulsion is less than 7.0, it is about 7.0 to 8.0 to adjust pH value by the aqueous solution of sneaking into alkali or basic matterial in emulsion, the emulsion coating of pH value that applied the above-mentioned adjusted of last layer on the inner surface of above-mentioned ruggedized construction.

8,, it is characterized in that the common scope of the pH value of said emulsion approximately is 2.0 to 4.0 by the method that claim 7 limited.And, the pH value of this emulsion is transferred to 7.0 to 7.5 by being added with alkaline aqueous solution therein.

9,, it is characterized in that said ruggedized construction comprises two metal frame frame plates (25,26) in order to be shaped around said screen dish (12), and said adhesive material is to be coated on the inner surface of said frame plate by the method that claim 1 limited.

10,, it is characterized in that, having at least a part to be coated with the water-based emulsions coating of above-mentioned sticky matter reaction composition on the inner surface of each of said frame plate (25,26) prior to steps A by the method that claim 9 limited.

11,, it is characterized in that prior to steps A, provide the water-based emulsions that comprises said sticky matter reacted constituent, the pH value of this emulsion is in 7.0 to 7.5 scope by the method that claim 1 limited.At least a portion at the inner surface of said ruggedized construction (25,26) is covered with above-mentioned emulsion, and the emulsion of this lining of subsequent drying.

12, a kind of by a cathode ray tube and the product that ruggedized construction constitutes, this cathode ray tube comprises a glass screen dish, above-mentioned ruggedized construction is suitable for around above-mentioned screen dish, said ruggedized construction is made of the metal that corrodes in the acid water medium, it is characterized in that, said product has the organic polymer sticky matter coating of a noncorrosive inherent viscosity, and this coating is positioned between said ruggedized construction (25,26) and the said screen dish (12).And contact with ruggedized construction and screen dish.

13, a kind of by product that claim 12 limited, it is characterized in that, said ruggedized construction comprises two metal frame frame plates (25,26), frame plate lumps together around said screen dish (12), also comprise a metal tape around the said frame plate (28), said adhesive material is between said frame plate and above-mentioned screen dish.

14,, it is characterized in that said sticky matter is a kind of acrylic acid derivative that is obtained by water-based emulsions by the product that claim 12 limited.

15, by product that claim 12 limited, it is characterized in that, the said gluing coating (27) that go up to generate in situ be by: apply and normally acid aqueous emulsions coating of subsequent drying, the pH value of adjusting this emulsion and is that one-tenth by said adhesive material is grouped within 7.0 to 8.0 scope in essence.

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