CN85103155A - cathode ray tube - Google Patents

Abstract

The tube face plate of a cathode ray tube has an uneven film formed by spraying a mixed solution of silicon hydroxide, alcohol and alkyl acetate on the tube face plate.

Description

Cathode ray tube

What the present invention relates to is a kind of cathode ray tube, and more particularly, what relate to is a kind of equipment that is used to prevent to produce reflection on the pipe face of cathode ray tube.

Usually, the pipe face of cathode ray tube is smooth, smooth, can strong reflection extraneous light, thereby make and watch the image that is presented on the phosphor screen to become very difficult.A kind of cathode ray tube that has improved comes out as a kind of method that addresses this problem is recommended.In this cathode ray tube, the pipe face has passed through non-glare treated, carries out diffusion and reflection with light to external world.In order to produce diffuse reflection on the pipe face, the whole bag of tricks is recommended to come out.According to a kind of method, the glass of cathode ray tube pipe face carries out etch partly in hydrofluoric acid (hydrofluoric acid) handles, and makes the pipe face become uneven or becomes coarse.This method can be controlled its condition by prudent, and is applied in some actual conditions.Yet this method also produces problem miscellaneous simultaneously, and for example, environmental pollution has the trend that is increased the weight of; Ray tube easily is damaged; Can not regenerate and can not use this method or the like production tube.According to method another kind of, that be called abrasive jet cleaning, the pipe face is sprayed a kind of polishing agent, so that it becomes uneven.The shortcoming of this method is to obtain uniform quality; Can not regenerate and owing to used this impurity of polishing agent, and may cause impure etc.Also having a kind of method is that a kind of plastic film is coated on the pipe face.Yet this method also has problem, easily is damaged or scratches as plastic film, and can dissolve in organic solution.

According to disclosed a kind of method in No.11150/69 Japanese Utility Model bulletin (Japanese Utility Model Publication), with spray gun or similar thing, a kind of base brine solution (alkali salt aqueous) (being called waterglass usually) of silicic acid (Silicic acid) is ejected on the pipe face of cathode ray tube, then, the pipe face that sprayed is carried out heat treated, on the pipe face, to form the rough film of one deck.Yet in this method, owing to contain alkali matter in the employed aqueous solution, therefore, film reacts with airborne moisture content, and becomes milky, and perhaps the top layer of film melts away.So this method is not practical.In No.26277/75 Japanese Utility Model bulletin, disclose a kind of like this method, promptly passed through on cathode ray tube pipe face, to spray the mixed solution of silicon tetrachloride and alcohol or ester, and form the uniform film of a kind of unevenness.Can provide excellent film in this way.But, because what sprayed is the acid solution that contains hydrochloric acid, thus produced jet pipe by corrosion and keeping and use solution must be careful etc. problem.In addition, if the halogen ion in the hydrochloric acid reacts with electron gun, the halogen ion can reduce the emissivities of electron gun, thereby shortens the life-span of cathode ray tube.In a large amount of production processes, such situation usually takes place: not sealed cathode ray tube be placed in one will be injected the next door of cathode ray tube (this cathode ray tube is sealed), spray the halogen ion that left behind after finishing and easily react with not sealed cathode ray tube.Therefore, must thoroughly remove the halogen ion that left behind, like this, just increase the operation of producing, thereby increased production cost.

Therefore, one object of the present invention is exactly that a kind of cathode ray tube that has improved will be provided, and wherein, it is coarse that the pipe face of cathode ray tube is made into, and can make the image that the demonstrates diffuse reflection clearly that becomes effectively to produce.

According to the present invention, cathode ray tube contains one and has the shell of managing faceplate panels; The inner surface of this pipe faceplate panels is made up of an energy luminous phosphor screen under the bombardment of electron beam, and the film of the mixed solution formation of one deck oxyhydroxide (silicon hydroxide) of silicon, pure and mild alkyl acetates (alkyl acetate) is arranged on its outer surface; This film has the unsmooth surface of an optics.In a kind of change scheme, can in mixed solution, add acetone and acetate (acetic acid).

The unique accompanying drawing of the present invention is a cutaway view, demonstration be the essential part that adopts among the embodiment of cathode ray tube of the present invention.

The shell 1 of the cathode ray tube shown in the accompanying drawing has a neck part 1a, a funnel part 1b and a pipe face portion 1c who seals the opening of funnel part 1b by sintered glass 2.In neck part 1a the inside, be equipped with an electron gun structure 4 that supports by tubing string 3; The inner surface of the panel of pipe face portion 1c is made of a phosphor screen 5.Shadow mask 6 quilt cover supporters 7 are fixed on the inside of pipe face portion 1c, with relative with phosphor screen 5.A kind of mixed solution of the oxyhydroxide of silicon, pure and mild alkyl acetates, or the mixed solution that has added acetone and acetate again is ejected on the outer surface 1c ' of pipe faceplate panels, with the film 8 that covers the hackly mixture of layer of surface thereon.Then, shell is carried out heat treated, film 8 is fixed on firmly on the pipe faceplate panels.In the present embodiment, the impurity content of the chloride thing in the mixed solution is limited in below about 20/1000000ths (20PPm).In addition, the basic ion content in the mixed solution also is limited in below about 5/1000000ths (5ppm).Expect the film 8 of even surface roughness, preferably adopt a kind of like this injection method.In this method, the quantity and the shape that will be ejected at the particle of sample surfaces (surface of cathode ray tube pipe faceplate panels) are to be adjusted by the jet pipe of spray gun.The quantity of the particle that is sprayed and shape depend on air pressure, the spraying rate of solution and the time of injection of the air compressor machine that the distance of sample and spray gun, the preparation of used solution (kind and content), spray gun are used.In the method, when fine and closely woven drop during with the vaporific outer surface 1c ' that is ejected at surface-pipe faceplate panels for the treatment of coating, because outer surface 1c ' is preheated to 40-100 degree centigrade, therefore, drop is progressively decomposed, and losing fluidity, thereby solvent is stayed on the outer surface.Like this, just, formed the layer of surface roughness evenly and be fixed on the film on pipe faceplate panels surface firmly.After this,, heating and the oven dry that carried out 15-30 minute on the surface of pipe faceplate panels are handled, film is connected together tightly with the glass material of outer surface 1c ' with 120-250 degree centigrade temperature.In addition, the intensity of film 8 also is improved, and like this, film 8 just can not peeled off or scratch.

What describe below is a specific embodiment.Prepare a kind of mixed solution; This mixed solution is by solute (as the oxyhydroxide of silicon) and a kind of solvent composition.It is 5 lysed solid silica that this solute contains percentage by weight; It is that 63 ethanol (ethyl alcohol), percentage by weight are that 26 acetic acid esters (ethyl acetate), percentage by weight are that 10 acetone and percentage by weight are 1 acetate (acetid acid) that this solvent contains percentage by weight.Then, according to the condition of following 1-5, mixed solution is sprayed 14 with spray gun " surface of the pipe faceplate panels of (inch) cathode ray tube:

(1) the stainless steel jet pipe of use resistance to chemical attack;

(2) air pressure of air compressor machine is 3.5 kg/cm;

(3) injecting time is 2.0 minutes;

(4) spraying rate of penetrating from the liquid of jet pipe is 15 ml/min;

(5) distance of jet pipe and sample surfaces is 30-40 centimetre.

In the present embodiment, the outer surface 1c ' of pipe face portion is preheated to about 60 degrees centigrade.After the coating, coating is carried out 20 minutes heat treated, form excellent film 8 with best surface unevenness to go up at outer surface 1c ' with 150 degrees centigrade temperature.

In another embodiment, acetone and the acetate in the solution of a last embodiment is removed.Prepare a kind of mixed solution; This mixed solution is by a kind of solute (as the oxyhydroxide of silicon) and a kind of solvent composition.It is 5 lysed solid silica that this solute contains percentage by weight; It is that 70 ethanol and percentage by weight are 30 butyl acetate (butyl acetate) that this solvent contains percentage by weight.To the solution that mixes, according to a last condition that embodiment is identical, spray and heat treated, to form excellent film 8.

The extraneous light of the sure correlation of cathode ray tube on outer surface 1c ' of making of said method carries out diffusion and reflection, like this, both having made is by day or under the irradiation of light, also regular reflection can not take place on the outer surface 1c ', thereby still can clearly watch the image that demonstrates.In addition, make this cathode ray tube and also be easy to, and do not worry that film 8 in use can be damaged, thereby prolonged useful life.The resistance of film 8 is 1 * 10 ⁹-1 * 10 ¹¹In the scope of ohmcm, to avoid outer surface 1c ' charged.In addition, because the Main Ingredients and Appearance of film 8 is silicon dioxide SiO ₂Or quartz glass, therefore, its refractive index is between 1.42-1.50, less than the refractive index of the glass material of managing face portion 1c.Like this, because film 8 surface irregularities, simultaneously also because its optical characteristics, film 8 has just played the effect of reflecting of preventing effectively.

As mentioned above, according to the present invention, penetrate at the extraneous light of cathode radial tube faceplate panels by complete diffusion with reflect away, in order to can watch at an easy rate the image that demonstrates. In addition, be different from elder generation Cathode-ray tube in the technology is arranged, do not worry that film can peel off and damage. Therefore, cathode-ray tube performance height of the present invention is reliable, and can high yield, high finished product rate ground makes high-quality film.

Claims (6)

1, a kind of cathode ray tube that includes a shell and thin film, the pipe faceplate panels that described shell is made up of an energy luminous phosphor screen under the bombardment of electron beam an inner surface, described film is to form on the outer surface of described pipe faceplate panels by the oxyhydroxide that uses silicon, the mixed solution of pure and mild alkyl acetates, and described film has a unsmooth surface of optics.

2, as claim 1 described cathode ray tube, wherein, described mixed solution also comprises acetone and acetate.

3, as claim 1 described cathode ray tube, wherein, described film forms by described solution is injected on the described pipe faceplate panels.

4, as claim 2 described cathode ray tubes, wherein, described film forms on described pipe faceplate panels by described mixed solution is sprayed.

5, as claim 3 described cathode ray tubes, wherein, described mixed solution is ejected on the pipe faceplate panels of preheating, and is heated processing.

6, as claim 4 described cathode ray tubes, wherein, described mixed solution is ejected on the pipe faceplate panels of preheating, and is heated processing.

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