KR100227676B1 - Manufacturing method of cathode ray tube - Google Patents

Abstract

The present invention relates to a method for manufacturing a CRT which manufactures a screen without waste of phosphor material in a simpler process. The present invention relates to a screen manufacturing process of forming a screen using a printing method on one surface of a flat plate, and a shadow mask. Provided are a method for manufacturing a CRT including a support frame joining step of joining a support frame to be mounted to a front plate and a funnel joining step of joining a funnel to a support frame. The screen manufacturing process is performed by printing and drying each mixture where the black matrix film and the G, B, and R phosphors are to be placed using respective printing masks separately provided. Accordingly, it is possible to manufacture a flat CRT which is easily realized in screen production.

Description

Manufacturing method of CRT

The present invention relates to a method for producing a CRT, and more particularly to a method for manufacturing a CRT that can produce a screen without waste of phosphor material in a simpler process.

In general, the CRT scans an electron beam controlled by an image signal on a screen formed on an inner surface of a panel, emits light when the phosphor that is incident on the electron beam is excited, and transmits the light to a user to recognize the image.

To this end, the CRT is formed by combining a panel forming a windshield and a funnel having a wide opening toward the panel and a neck portion into which an electron gun is inserted.

A screen is formed on the inner surface of the panel, which is composed of G, B, and R phosphors, and a black matrix film positioned at a portion excluding the phosphor, and the black matrix film is formed of a non-light-emitting absorbent material such as graphite. Absorption of non-landing electron beams is enhanced to improve color purity and contrast.

As described above, the panel on which the screen is formed on the inner surface of the panel forms a predetermined projection toward the funnel, and the projection includes mounting a mask assembly including a support frame for supporting a shadow mask.

The shadow mask has a color screening function that passes an electron beam emitted from an electron gun and lands on a predetermined phosphor, which is generally fixed to a supporting frame after applying a tensile force in at least one direction to prevent a doming phenomenon and to form a plane. The mask assembly is fixed to the panel protrusion.

Referring to the conventional screen manufacturing process of the CRT, the photosensitive resin film is applied to the inner surface of the panel on which the screen is to be formed, and the mask assembly is bonded to the panel to perform three exposures to cure the photosensitive resin film to produce G, B, and R phosphors. The photosensitive resin film remains in the space to be located.

When the graphite mixture constituting the black matrix film is applied to the entire inner surface of the panel and the etching operation is performed, the photosensitive resin film is removed to form a black matrix film in the remaining space except for the space in which the phosphor is located.

Subsequently, a coating solution which increases the adhesion of the phosphor mixture to the panel is applied to the panel, dried, the G phosphor mixture is applied, and the mask assembly is combined to perform an exposure operation to cure the G phosphor mixture to complete the G phosphor.

When the mixture of B and R phosphors is applied in the same manner as the formation of the G phosphor and the exposure operation is performed, all G, B, and R phosphors are completed to form a screen.

However, the conventional screen manufacturing method is made by the exposure operation as described above, which is very complicated and there is a serious problem in the waste amount of the phosphor slurry since the phosphor mixture is not washed and removed.

In addition, in the case of the tension shadow mask to which the tensile force is applied, since the support frame for supporting the shadow mask generally has a heavy weight and a large structure, it is not easy to combine / separate with the panel during the exposure operation, and thus an exposure mask must be manufactured separately. In addition, the shadow mask mounted on the CRT corresponds exactly to the screen fabricated on the inner surface of the panel, and there is a process difficulty in mounting it.

In order to solve the above problems, the screen production using the printing method is devised, but the printing method also has a problem in that the screen manufacturing using the printing method is not easily performed with the structure of the CRT made of a conventional panel and a funnel. .

That is, in the conventional panel structure, the panel has a joining surface engaging with the funnel to form a protruding jaw with a predetermined length, and the front surface of the panel does not form a completely flat surface and forms a predetermined curvature with the corner portion.

Accordingly, the printing method of printing the mixture by the roller to the front of the panel has a problem that the printing method is not easy to implement the printing method due to the protrusion and the predetermined curvature formed on the panel edge, and the uniform screen production cannot be realized.

Accordingly, the present invention has been made to solve the above problems, and an object of the present invention is to provide a method for producing a CRT tube which can produce a flat screen without waste of phosphor material in a simpler process.

In order to achieve the above object, the present invention provides a screen manufacturing process for forming a screen using a printing method on one surface of the front plate is formed flat, and support for mounting and mounting a shadow mask on one surface of the front plate manufactured the screen Provided is a method for manufacturing a CRT including a support frame joining step of joining a frame, and a funnel joining step of attaching a funnel having an opening arranged to the screen side and a neck portion into which an electron gun is inserted, to one side of the support frame.

Accordingly, the ultra-flat CRT is realized due to the flat front plate, and the screen can be manufactured by a simpler process by making a screen using the printing method on the front plate.

1 is a process flow chart showing the procedure of the CRT manufacturing method according to the present invention.

Figure 2 is a partial cross-sectional view of the CRT according to the CRT manufacturing method according to the present invention.

Figure 3 is a flow chart showing the various steps of the screen manufacturing process of Brown and the manufacturing method according to the present invention.

Figure 4 is a partial cross-sectional view of the printing machine used in the screen manufacturing process of the CRT manufacturing method according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a process flow chart showing the sequence of the CRT manufacturing method according to the present invention, the CRT manufacturing method newly implemented by the present invention is a screen manufacturing process of forming a screen by using a printing method on one surface of the front plate is formed flat ( P1), a support frame joining process (P2) for joining a support frame for supporting and mounting a shadow mask to one surface of the front plate on which the screen is formed, and a funnel joining process (P3) for attaching a funnel to one side of the support frame. It is done by

2 is a partial cross-sectional view of the cathode ray tube implemented by the cathode ray tube manufacturing method according to the present invention, and includes a front plate 4 forming a screen 2 on an inner surface thereof, and a shadow mask 6 corresponding to the screen 2. It consists of a support frame (8) for supporting mounting and bonding with the front plate (4), a neck portion (12) for inserting and mounting the electron gun (10) and an opening (14) widening toward the front plate (4) A CRT is shown in which the opening 14 comprises a funnel 16 which joins the support frame 8.

The front plate 4 is made of a glass material forming a flat surface and the support frame 8 for supporting the shadow mask 6 is also made of glass material, so that the front plate 4 and the support frame 8 are coupled to each other. Thus, a structure corresponding to a conventional panel is achieved.

In addition, since the shadow mask 6 disposed corresponding to the screen 2 formed on the inner surface of the front plate 4 and having a color discrimination function should be formed in the same plane as the screen 2 forming the plane, the shadow mask 6 should be formed in both directions or in four directions. After the tensile force is applied, the shadow mask 6, which is applied to the support frame 8 and is applied to the support frame 8, is referred to as a tension mask.

The shadow mask 6 is fixedly mounted to the support frame 8 by a fixing member 18 made of a metal material or the like.

Referring to the manufacturing method of the CRT having such a configuration in more detail as follows.

3 is a step flowchart showing various steps of the screen manufacturing process (P1), the screen manufacturing process (P1) newly implemented by the present invention is a front plate mounting step (S1) for fixing the front plate to the printing machine, and the front A printing mask mounting step (S2) of mounting a printing mask on the upper side of the plate, a reference point alignment step (S3) of matching the reference point of the front plate and the printing mask, a printing step (S4) of applying and printing a mixture, and It consists of a drying step (S5) of drying the applied mixture.

In the screen manufacturing process P1, the printing mask mounting step S2, the reference point alignment step S3, the printing step S4, and the drying step S5 are repeated four times, which is performed by printing the black matrix film. Each of the G, B, R phosphor printing as described in more detail as follows.

4 is a partial sectional view of a printing machine used in the screen manufacturing process P1 of the CRT manufacturing method according to the present invention, wherein the printing machine 22 includes a support member 24 for positioning the front plate 4 and a mask for printing ( 26) a printing roller 28 disposed on the upper side to print the mixture, a carrier 30 for conveying the printing roller 28, and a rail 32 for guiding the carrier 30.

The printing roller 28 is a cylindrical roller having a length similar to that of one side of the front plate 4, which is arranged on one side of the front plate 4 and starts at one end of the front plate 4. It has the function of printing the screen mixture on the front plate 4 while being transferred to the opposite end.

In addition, the carrier 30 is provided at both ends of the printing roller 28 so as to transfer the printing roller 28, and the carrier 30 is mounted on the surface of the rail 32 so as to be transported to the surface of the rail 32. It is conveyed while performing a linear motion along and conveys the said printing roller 28.

The rail 32 forms a pair of left and right sides and mounts the carrier 30 to the left and right rail 32 surfaces, and the carrier 30 is provided at both ends of the printing roller 28 to print the roller 28. ) Will be transferred uniformly.

After fixing the front plate 4 formed flat on the support member 24 of the printer 22 thus formed (S1), and placing the black matrix film printing mask 26 on the upper side of the front plate (4) (S2) By the alignment sensor (not shown), the reference point of the front plate 4 and the black matrix printing mask 26 coincide (S3).

At this time, the front plate mounting step (S1) is made by fixing the front plate 4 to the mounting member 34 protruding in a predetermined shape from the upper side of the support member 24.

In addition, the black matrix film printing mask 26 forms a space portion having the same shape as the space where the black matrix film is to be located, which is a structure in which connecting members having extremely fine diameters connect individual stripe types when the screen phosphor is stripe type. The mask for printing is integrally formed, and when the screen phosphor is grill type, the black matrix film is also grill type, and thus a grill type printing mask having the same shape as the space in which the phosphor is to be formed is formed.

The printing roller 28 is transferred to the upper side of the black matrix film printing mask 26 having the structure as described above, and the black matrix film mixture is applied by the rotation of the printing roller 28 and printed (S4). The mixture is dried (S5) to complete the black matrix film.

After completing the black matrix film and then printing the phosphor mixture, the phosphor mixture printing process is performed through the same process as the black matrix film forming process.

That is, the mask for printing the G phosphor is disposed on the upper side of the front plate on which the black matrix film is formed (S2), and the reference point of the mask for printing the G phosphor and the front plate is matched using an alignment sensor (S3), and then the G phosphor mixture is printed ( S4) After the drying process (S5), the G phosphor is attached to the inner surface of the panel to complete the G phosphor printing.

Since the mask for printing the G phosphor forms the same space as the space in which the G phosphor is to be placed, when the G phosphor mixture is printed above the mask for printing the G phosphor, the G phosphor mixture is printed to the inner surface of the panel through the space.

By printing the B phosphor and the R phosphor in the same manner as the above-described G phosphor printing, the screen is completed, and the B phosphor printing mask and the R phosphor printing mask form the same space as the space where the B phosphor and the R phosphor are located, respectively. have.

As such, when the screen manufacturing process P1 is completed on one side of the front plate 4 using the printing method, the support frame 8 supporting the shadow mask 6 through the support frame bonding process P2 is mounted on the front surface. The plate 4 is bonded.

The support frame bonding process P2 combines the support frame 8 and the front plate 4 by using laminated glass 20 such as frit, and at this point, the shadow mask 6 is attached to the screen 2. The support frame 8 is bonded to the front plate 4 with the exact coincidence with.

The next step is a funnel bonding step P3, which is a step of attaching the opening 14 of the funnel 16 to the support frame 8, and laminated glass 20 such as frit in the same way as the support frame bonding step P2. Is done using

After the funnel bonding process P3 is completed as described above, the front plate 4, the support frame 8 and the funnel 16 are combined to complete the bulb, and the subsequent manufacturing process is performed in the same manner as the conventional CRT manufacturing process. .

Although the preferred embodiments of the present invention have been described above, the present invention is not limited thereto, and various modifications and changes can be made within the scope of the claims and the detailed description of the invention and the accompanying drawings. Naturally, it belongs to the scope of the invention.

As described above, the present invention can produce a screen of a flat CRT without waste of slurry mixture in a simpler process compared to the screen production by conventional exposure operations by manufacturing a screen using a printing method on one surface of a flat plate. It works.

Claims (7)

A screen manufacturing process of forming a screen by using a printing method on one surface of the front plate which is flat; A support frame bonding process of bonding a support frame for supporting and mounting a shadow mask to one surface of the front plate on which the screen is manufactured; And a funnel bonding step of attaching a funnel having an opening arranged on the screen side and a neck portion into which an electron gun is inserted, to one side of the support frame. The method of claim 1, wherein the screen manufacturing process comprises: a front plate mounting step of fixedly mounting a front plate to a printing press, and a printing mask mounting step of fixedly mounting a printing mask above the front plate; A reference point alignment step of matching the reference points of the front plate and the mask for printing; A printing step of printing the mixture on the upper side of the printing mask; A method for producing a CRT comprising a drying step of drying the printed mixture. The method of claim 2, wherein the printing mask mounting step, the reference point alignment step, the printing step, and the drying step are repeated four times, and the black matrix film printing and the green, blue, and red phosphor printing are performed. The method of manufacturing a CRT according to claim 1, wherein the supporting frame bonding step is to bond the supporting frame to the panel using laminated glass. The method according to claim 1, wherein the funnel bonding step is to bond the funnel to the support frame using laminated glass. The method of claim 1, wherein the support frame is made of a glass material. The method of claim 1, wherein the shadow mask is at least one side is applied to the tension applied to the support frame manufacturing method of the CRT.

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