JPH05151913A - Cathode-ray tube with mark for reading and manufacture of mark - Google Patents

Abstract

PURPOSE:To provide a marked cathode-ray tube and a manufacturing method for marks for reading which are applied on a side of a pannel, the marks of which are not deteriorated in quality at the following manufacturing process and not erased. CONSTITUTION:At a side of the glass panel 1 of a cathode-ray tube a mark 2 for reading is provided. The mark 2 comprising a lower layer 2a of white type heat resistant and acid-resisting paint and a marked part 2b by a heat resistant ink showing a good contrast against the color printed on the lower layer 2a, and an upper layer 2c of a transparent heat resistant and acid-resisting paint on the marked part 2b. In forming the mark 2 firstly the lower coating comprising a white type heat resistant and acid-resisting paint is applied, then thereon the mark part 2b is printed by an ink jet recording means containing the heat resistant ink showing a good contrast against the lower coating, and finally the upper coating comprising the transparent heat resistant and acid- resisting paint is applied onto the marked part 2b.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT with a reading mark and a method for manufacturing the mark, and more particularly, to prevent the marks provided on the side surface of the glass panel from being deteriorated in various steps in manufacturing the CRT. The present invention relates to a cathode ray tube with a reading mark on which the mark is formed and a method for manufacturing the mark.

[0002]

2. Description of the Related Art Generally, in a cathode ray tube manufacturing process, a common type of cathode ray tube manufacturing step is used in which many types of cathode ray tubes are sequentially or appropriately selected and manufactured. Then, in the manufacturing process path,
When manufacturing one type of cathode ray tube, one processed part used for the one type is combined with another processed part used for the one type one after another.

Conventionally, in the manufacturing process of the cathode ray tube, the parts to be used for the cathode ray tube to be assembled by the manufacturing operator are
By looking at the mark attached to the part or the part itself, a suitable one is selected for assembly and processing. However, as the cathode ray tube to be manufactured becomes larger and the definition becomes higher, it becomes difficult for the manufacturing operator to cope with the work of selecting and transporting parts and precision work, and recently, the automatic operation of the entire cathode ray tube manufacturing process including each of the above operations has become difficult. Processing and automatic assembly have come to be measured.

In this case, in order to achieve the above-mentioned automatic processing and automatic assembly of the entire manufacturing process, it is clarified what kind of cathode ray tube is currently manufactured, and In order to accurately select and assemble parts that fit the type of CRT, or to perform processing that fits this type of CRT, the type of the CRT on the side of the glass panel during manufacturing of the CRT. It is also done to put a mark or the like to indicate.

By the way, as a CRT having a machine reading mark, particularly a bar code, on the side surface of a glass panel, for example, Japanese Utility Model Publication No. 60-136465, US Pat. No. 4,374,451, US Pat. No. 4,377,890, US Pat. There is one disclosed in Japanese Patent No. 4515867. Among them, those disclosed in Japanese Utility Model Publication No. 60-136465 (hereinafter, referred to as
This is called the former means) is on the side of the glass panel,
A heat-resistant substance is used to print a bar code having a different number for each cathode ray tube or a number incremented for each cathode ray tube, and US Pat. No. 4,374,445.
No. 1, US Pat. No. 4,377,890, US Pat. No. 451.
No. 5867 (hereinafter, these are referred to as the latter means) are all disclosed at the beginning of the cathode ray tube manufacturing process.
A double layer is formed on the side surface of the glass panel by using two kinds of water glass-based paints having different compositions, and then a laser beam is irradiated from above this layer to form a bar code. This bar code is mechanically read in the subsequent manufacturing process of the cathode ray tube and then used for controlling the manufacturing process by computer processing.

Since the bar code is mainly used for controlling and recording the state of the cathode ray tube during the manufacturing process, it is usually formed on the side surface of the glass panel at the beginning of the cathode ray tube manufacturing process. To be done. However, in the manufacturing process, after forming a barcode, since the glass panel is subjected to treatment with relatively high heat or various acids, the barcode is deteriorated by the treatment with high heat or acid, Sometimes it disappeared.

Therefore, conventionally, when forming a bar code, the bar code is printed using a heat-resistant substance as in the former method, and the latter method is used.
The bar code is formed by the laser beam.

[0008]

However, even with the former means, it is unavoidable that the bar code formed on the glass panel deteriorates in the subsequent manufacturing process of the cathode ray tube. The problem of disappearing barcodes still remains.

In the latter method, the bar code formed on the glass panel can be avoided from being deteriorated or disappeared in the subsequent manufacturing process of the cathode ray tube, but the bar code is used by using the laser beam. Since it is formed, the manufacturing process becomes complicated, and the manufacturing apparatus becomes expensive, so that there is a problem that the unit cost of manufacturing the cathode ray tube increases.

The present invention is intended to solve the above problems, and its main object is to provide the above-described cathode ray tube with a mark and a method for producing the mark, in which a formed mark is not deteriorated or erased in a subsequent manufacturing process. Especially.

A secondary object of the present invention is to provide a cathode ray tube manufacturing apparatus capable of inexpensively obtaining the marked cathode ray tube that is not deteriorated or erased.

[0012]

In order to achieve the main object, the present invention provides an underlayer of a heat-resistant and acid-resistant paint of white or similar color on the side surface of a glass panel of a cathode ray tube, and an underlayer of the underlayer. A mark portion made of a heat-resistant ink having a good contrast color with respect to the color of the underlayer printed on, and a reading mark comprising a transparent heat-resistant and acid-resistant topcoat layer coated on the mark portion, or ,
A first means is provided which is provided with a reading mark without the above-mentioned overcoat layer.

Further, in order to achieve the main object, the present invention is provided on the side surface of a glass panel of a cathode ray tube.
Marks for reading by an ink jet recording device in which a base made of a heat-resistant and acid-resistant paint of white color or a similar color is applied, and then heat-resistant ink having a good contrast color with the color of the base is contained on the base. And finally applying a transparent and heat-resistant and acid-resistant paint topcoat on the mark, or omitting the topcoat step
It is equipped with means.

Further, in order to achieve the above-mentioned secondary object, the present invention has been provided and carried by the glass panel carrying path and the shadow mask carrying path of the cathode ray tubes juxtaposed to each other and the both carrying paths. Type confirming means for confirming the specification type of the glass panel and the shadow mask, mask transferring and assembling means for transferring the shadow mask on the shadow mask conveying path to the glass panel conveying path and incorporating it into the glass panel of the corresponding specification type, and a shadow. A base layer forming means for forming a base layer on the side surface of the glass panel in which a mask is incorporated, a mark forming means for forming a reading mark portion on the base layer, and a mark portion provided as necessary. A topcoat layer forming means for forming a transparent topcoat layer on the glass panel, and a firefly downstream of the topcoat layer forming means in the glass panel conveying path. Surface forming means comprises a third means provided it is.

[0015]

[Function] Even if the bar code formed on the side surface of the glass panel of the cathode ray tube is printed by using a heat-resistant and acid-resistant substance (ink), it may deteriorate or disappear in the subsequent cathode ray tube manufacturing process. About why
The present inventors pursued the cause by repeating various experiments. As a result, the main cause of the ink once firmly attached to the glass panel surface to fall off from the glass panel surface is acid, in particular, the ink is dissolved by contact with hydrofluoric acid at the bar code attached portion, Not because the ink is peeled off from the glass panel surface, hydrofluoric acid reaches the glass panel surface therethrough through a very thin layer of the ink, the glass panel surface is dissolved in hydrofluoric acid, the ink It was found that this was due to peeling from the glass panel surface.

Therefore, in the present invention, first, a base layer made of a heat-resistant and acid-resistant paint that is strong against hydrofluoric acid is formed, and a reading mark is printed with the heat-resistant ink using an ink jet recording apparatus, and if necessary, the read mark is printed. Then, an overcoat layer made of a transparent heat-resistant and acid-resistant paint was formed thereon.

The reading mark formed as described above was tested for acid resistance against hydrofluoric acid. As a result, the reading mark consisting of three layers of the underlayer, the mark portion and the overcoat layer was almost deteriorated. And good results were obtained. Further, the reading mark composed of the two layers of the underlayer and the mark portion was inferior to that of the above-mentioned three layers, but no significant deterioration was observed, and it was found that it was within the practical range. The reason why the deterioration does not proceed in this way is that the hydrofluoric acid prevents the overcoat layer and the underlayer, particularly the underlayer from reaching the glass panel surface, whereby the glass panel surface is not melted, and the ink is the glass This is probably because it is no longer peeled off from the panel surface.

As described above, according to the present invention, the reading mark formed during the manufacturing process of the cathode ray tube is not deteriorated or erased in the subsequent manufacturing process. In the process, the mark cannot be read or the mark is not read by mistake, and after the mark is formed, the mark can be effectively used in various places.

Further, during the manufacturing process of the cathode ray tube, the above-mentioned base layer coating means for newly adding the mark, or the above-mentioned base layer coating means and top coat layer coating means are respectively added. However, since those means need only have an extremely ordinary structure, the manufacturing apparatus does not become complicated or expensive, and the unit price of the cathode ray tube does not increase.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing an embodiment of a cathode ray tube in which a reading mark according to the present invention is provided on a glass panel surface, and FIG. 2 shows a structure of a glass panel surface provided with a reading mark. It is an expanded sectional view shown.

In these figures, 1 is a glass panel,
1a is a glass panel upper surface, 1b is a glass panel side surface, 1
c is a panel mold match line, 2 is a reading mark, 2
Reference numeral a is a base layer, 2b is a mark portion, 2c is an overcoat layer, 3 is a sealing edge (sealing surface), 4 is a shadow mask, 5 is a funnel portion, and 6 is a neck portion.

A fluorescent surface is formed on the inner surface of the upper surface 1a of the glass panel 1, and the existing portion of the fluorescent surface constitutes an image display effective surface. A reading mark 2 including a base layer 2a, a mark portion 2b, and an overcoat layer 2c is provided on one side surface 1b of the glass panel 1, and a shadow mask 4 is arranged inside the glass panel 1 so as to face the fluorescent screen. To be done. The glass panel 1 and the funnel portion 5 are connected by a frit glass on the sealing surface 3, and an electron gun is built in a neck portion 6 continuous with the funnel portion 5. In this case, as the reading mark 2, a bar code alone or a bar code and a number, a character, a symbol, etc. related to the bar code is used. In the cathode ray tube having the above-described structure, the electron beam emitted from the electron gun is projected onto the fluorescent surface, and the fluorescent surface emits light to display a desired image on the effective surface. The same operation as that of is performed.

FIG. 3 is a block diagram showing a process part for attaching the reading mark 2 and a process part immediately before it in the cathode ray tube manufacturing apparatus.

In FIG. 3, 7 is a glass panel transporting conveyor, 8 is a shadow mask transporting conveyor, 9 is a shadow mask transporting machine, 10 is a glass panel and shadow mask assembling machine, 11 is a panel mask assembly (PMA) transporting conveyor, 12 Is a glass panel confirmation device, 13 is a shadow mask confirmation device, 14 is a heater for heating, 15 is a base layer coating device, 16 is an inkjet recording device, 17 is an overcoat layer coating device, 18 is a panel mask assembly (P
MA), and the same components as those shown in FIGS. 1 and 2 are denoted by the same reference numerals. In addition,
The panel mask assembly (PMA) 18 referred to here means a state in which the panel and the shadow mask are assembled.

The glass panel transfer conveyor 7 and the shadow mask transfer conveyor 8 are arranged substantially side by side, and the shadow mask transfer machine 9 is provided at the end of both transfer conveyors 7, 8.
Also, the glass panel and shadow mask assembling machine 10 is arranged. The types of the glass panel 1 and the shadow mask 4 that have been respectively conveyed near the end portions of the glass panel conveyer 7 and the shadow mask conveyer 8,
A glass panel confirmation device 12 and a shadow mask confirmation device 13 for determining characteristics and the like are arranged, and a heater 14 for heating is appropriately arranged along the glass panel transport conveyor 7. Further, the PMA transfer conveyor 11 is arranged so as to be continuous with the glass panel transfer conveyor 7 starting from the glass panel and shadow mask assembling machine 10, and the PMA 18 is transferred thereon. This PMA conveyor 11
A base layer coating device 15, an inkjet recording device 16, a heat treatment furnace 19, and an overcoat layer coating device 17 are arranged in this order along with the above, and a heating heater 14 is also arranged as appropriate.

In the CRT manufacturing apparatus having the above-mentioned structure, the following operations are executed.

The glass panel transfer conveyor 7 has a panel storage (not shown) on the upstream side (upper side in the figure).
Various kinds of glass panels 1 are sequentially transferred according to a scheduled program, and the transferred glass panels 1 are heated by a heater 14 for heating, and the glass panel confirmation device 12 determines the size of the panel and the panel effectiveness. The transmittance of the surface, the reflectance on the surface of the effective surface of the panel, the posture of the panel, etc. are confirmed. Further, on the shadow mask transport conveyor 8, the shadow mask 4 corresponding to the type of the glass panel 1 is stored in the program from the mask storage (not shown) which stores the assembled shadow mask 4 on the upstream side (upper side in the drawing). In accordance with the above, the shadow masks 4 are sequentially conveyed in synchronism with the conveyance of the glass panel 1, and the shadow masks 4 thus conveyed are the shadow mask confirmation device 1
In 3, the types of mask outline, mask hole size, mask hole interval, mask hole shape, mask direction, etc. are confirmed.

Then, when it is confirmed by the glass panel confirmation device 12 and the shadow mask confirmation device 13 that the type specifications of the glass panel 1 and the shadow mask 4 match, the glass panel 1 and the shadow mask are confirmed. The shadow masks 4 transferred through the transfer machine 9 are supplied to the glass panel and the shadow mask assembling machine 10 in the same manner, respectively, and the shadow masks 4 are automatically incorporated into the glass panel 1 so that the PMA 18 is provided.
Is formed. After being discharged from the glass panel and shadow mask assembling machine 10, the PMA 18 is conveyed by the PMA conveyer 11.

Here, the PMA 18 is first conveyed to a location where the underlayer coating device 15 is arranged. Here, a white paint exhibiting heat and acid resistance on one side surface 1b of the glass panel 1, for example, Kansai paint. "Campecera No.
155 "(trade name) is applied by using a select coat (trade name) manufactured by Nordson Co., Ltd. or an ordinary spray to form the underlayer 2a. Underlayer 2a thus formed
Is dried by the heating heater 14 during the transportation of the PMA 18. Next, the PMA 18 is conveyed to a position where the inkjet recording device 16 is arranged.
a heat-resistant brown ink having a good contrast color with the color of the underlayer 2a, for example, an inkjet recording ink "JP-T24" (trade name) manufactured by Hitachi,
Similarly, the mark 2b is printed using an inkjet recording device “FX series” (trade name) manufactured by Hitachi, Ltd. Then, the PM on which the underlayer 2a and the mark 2b are formed
A18 is a top coat layer coating device 17 through a heat treatment furnace 19.
In this example, a transparent heat-resistant and acid-resistant paint, for example, "Campecera ZC120" (trade name) manufactured by Kansai Paint Co., Ltd. By applying with a tool, the process of forming the reading mark 2 provided on the side surface 1b of the glass panel 1 is completed. In this case, the reason for passing through the heat treatment furnace 19 in the above-described process is to prevent the ink of the mark 2b from bleeding when the above-mentioned top coating is performed.

Furthermore, in the PMA transport conveyor 11, after the step of forming the reading mark 2 (downstream),
Means (not shown) for forming the phosphor screen are arranged.

Subsequently, FIG. 4 shows a side surface 1 of the glass panel 1.
It is a block diagram which shows the specific arrangement | positioning state of the reading mark 2 formed in b.

In FIG. 4, reference numeral 20 denotes a reinforcing band of the glass panel 1, and other components that are the same as those shown in FIGS. 1 and 2 are designated by the same reference numerals.

The reading mark 2 is formed such that the height h in the bar code is 15 mm or more and the width of the thick bar is 0.5 to 2.0 mm. The reason for such selection is the thickness (thinness) of the bar that can be recorded by the inkjet recording device 16, the required amount of information, and the thickness (thinness) of the bar required for reading.
This is because it is determined from the above that the above value is suitable. The reading mark 2 (bar code) is provided at a position where the lower limit line w is 5 mm or more, preferably about 10 mm away from the sealing edge (sealing surface) of the glass panel 1, and the reinforcing band. The reading mark 2 (bar code) is formed at a position where it is not hidden by the reinforcing band 19 when the reading mark 19 is attached. By arranging the reading mark 2 (bar code) in this way, it becomes possible to easily read the reading mark 2 (bar code) even after the cathode ray tube is incorporated in an actual product.

However, depending on the type of cathode ray tube, there is a type in which almost the entire side surface 1b of the glass panel 1 is concealed by the reinforcing band 19. Therefore, in the case of such type, the reading mark 2 (bar code) is used. It is sufficient to freely select the position to which is added within a range not exceeding the mold match line 1c.

Besides this, although not shown in FIG. 3,
A storage means is attached to the glass panel confirmation device 12 and the shadow mask confirmation device 13, and the storage means includes the type of the reading mark 2 formed on the glass panel 1 and the confirmation devices 12 and 13. The contents of the confirmation, the time when the mark 2 is formed in the process of forming the reading mark 2, the number of the manufacturing device that formed the mark 2 and the like are stored, and further, the fluorescent screen forming means and the subsequent devices in the cathode ray tube manufacturing device are stored. Various information corresponding to the mark contents formed on the cathode ray tube to be processed which is conveyed on the conveyance path, for the mark readers respectively arranged in the respective process sections on the conveyance path of the cathode ray tube to be processed, for example,
The processing conditions and the inspection conditions peculiar to the processed cathode ray tube are provided, and the inspection content of the processed cathode ray tube from the mark reader and the arrival time of the processed cathode ray tube of the inspection department are formed. Mark 2
I am trying to memorize in correspondence with. By providing such a storage means, not only can the various processing and inspections required for the CRT to be processed in the course of manufacturing, but also after completion of the CRT to be processed, It can be used as data for follow-up investigation of the manufacturing process of the CRT.

As described above, according to this embodiment, when forming the reading mark 2 on the side surface 1b of the glass panel 1, first, the underlayer 2a is formed by applying a white paint having heat and acid resistance, Next, a mark portion 2b made of heat-resistant ink is printed on it using an ink jet recording apparatus, and a top coat layer 2c is formed by coating a transparent heat-resistant and acid-resistant paint on the mark portion 2b. When all the manufacturing processes after the process of forming the reading mark 2 were passed, there was no deterioration of the reading mark 2 and almost no change was observed as compared with the state when the reading mark 2 was attached.

In the above-mentioned embodiment, the underlayer 2a
The heat-resistant and acid-resistant paints used for forming the overcoat layer 2c merely exemplify those suitable for forming them, and in the present invention, the underlayer 2a.
The paint used for forming the overcoat layer 2c is not limited to the above-mentioned ones. Further, in the above-mentioned embodiment, what is mentioned as a device for applying the coating material is merely an example of a device suitable as a coating device, and other devices may be used in the present invention. Of course. Further, in the above-mentioned embodiment, the inks forming the mark portion 2b and the ink jet recording apparatus are merely examples of those suitable for forming the mark portion 2b, and other inks in the present invention. Needless to say, an inkjet recording device may be used. In addition to this, in the present invention, the color of the underlayer 2a and the color of the ink forming the mark portion 2b are white or a light color similar thereto, and the latter contrasts with the color of the underlayer 2a. As a matter of course, any color may be selected as long as it is a relatively dark color.

Although not shown in the drawing, as another embodiment, the same effect as that of the above-described embodiment can be achieved by removing the overcoat layer coating device 17 from the above-mentioned embodiment. It is a thing. In this embodiment, the deterioration rate of the reading mark 2 is higher than that of the above-mentioned embodiments, but the value is considerably smaller than the deterioration rate of the conventional case in which no base is used, which is a practical problem. There is no such thing.

[0040]

As described above, according to the present invention,
In the middle of the cathode ray tube manufacturing process, the glass panel 1
The reading mark 2 formed on the side surface 1b of the same is formed by a base layer 2a made of a heat and acid resistant paint, a mark portion 2b printed with a heat resistant ink and an overcoat layer 2c made of a transparent heat and acid resistant paint, or Since it is composed of the underlying layer 2a and the mark portion 2b, the mark can be read in the subsequent manufacturing process without deterioration or erasing in the subsequent manufacturing process of the cathode ray tube. There is an effect that it is not present or the mark is not read by mistake.

Further, according to the present invention, the undercoat layer coating device 15 and the overcoat layer coating device 17 for newly providing the reading mark 2 during the manufacturing process of the cathode ray tube, or the undercoat layer coating device 15 is provided. Even if only the respective devices are added, the devices 15 and 17 need only have a very ordinary structure, and therefore the CRT manufacturing device is not complicated or expensive, and the unit price of the CRT is increased. It has the effect of never happening.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a Braun tube in which a reading mark according to the present invention is provided on a glass panel surface.

FIG. 2 is an enlarged cross-sectional view showing a configuration of a glass panel surface provided with a reading mark.

FIG. 3 is a configuration diagram showing a process part with a reading mark and a process part immediately before the process in the cathode ray tube manufacturing apparatus.

FIG. 4 is a configuration diagram showing a specific arrangement of reading marks 2 formed on a side surface 1b of a glass panel 1.

[Explanation of symbols]

1 glass panel 1a glass panel upper surface (effective surface) 1b glass panel side surface 1c panel mold match line 2 reading mark 2a base layer 2b mark portion 2c topcoat layer 3 seal edge (seal surface) 4 shadow mask 5 funnel portion 6 neck portion 7 Glass panel transfer conveyor 8 Shadow mask transfer conveyor 9 Shadow mask transfer machine 10 Glass panel and shadow mask assembly machine 11 Panel mask assembly (PMA) transfer conveyor 12 Glass panel confirmation device 13 Shadow mask confirmation device 14 Heating heater 15 Underlayer coating device 16 Inkjet recording device 17 Overcoat layer coating device 18 Panel mask assembly (PMA) 19 Heat treatment furnace 20 Reinforcing band

Claims (7)

[Claims] 1. A base layer of a heat-resistant and acid-resistant paint of white or a similar color on the side surface of a glass panel of a cathode ray tube, and a heat resistance of a good contrast color with respect to the color of the base printed on the base layer. A reading mark-equipped cathode ray tube comprising a marking portion made of a functional ink and a reading mark composed of a transparent heat-resistant and acid-resistant topcoat layer coated on the marking portion. 2. An underlayer of a heat-resistant and acid-resistant paint of white or a similar color on the side surface of a glass panel of a cathode ray tube, and a heat-resistant liquid of good contrast color with respect to the color of the underlayer printed on the underlayer. A cathode ray tube with a reading mark, which is provided with a reading mark composed of a mark portion made of a functional ink. 3. The reading mark according to claim 1, wherein the mark portion includes at least a bar code, and the bar code has a wide bar width of 0.5 to 2.0 mm. With cathode ray tube. 4. The cathode ray tube with a reading mark according to claim 1, wherein the mark portion comprises a bar code and a visually readable character or symbol. 5. The installation location of the bar code on the side surface of the glass panel of the CRT is at least 5.0 mm or more away from the seal edge of the CRT and is on the seal edge side from the reinforcing band arrangement position. The CRT with a reading mark according to claim 3. 6. A side face of a glass panel of a cathode ray tube is first coated with a base made of a heat-resistant and acid-resistant paint of white color or a similar color, and then a good color for the color of the base is applied on the base. It is characterized in that it has a step of printing a reading mark by an inkjet recording device containing a heat-resistant ink of contrast color, or after that, applying a top coat consisting of a transparent, heat-resistant and acid-resistant paint on the mark. CRT manufacturing method. 7. A glass panel transport path and a shadow mask transport path of juxtaposed cathode ray tubes, and type confirmation means provided on both of the transport paths for confirming the specification type of the glass panel and shadow mask transported. Mask transfer assembly means for transferring the shadow mask on the shadow mask transfer path to the glass panel transfer path and incorporating it into a glass panel of a corresponding specification type, and forming a base layer on the side surface of the glass panel in which the shadow mask is installed. Underlayer forming means, mark forming means for forming a reading mark portion on the underlying layer, overcoat layer forming means for forming a transparent overcoat layer on the mark portion, which is provided as necessary, and the glass. A reading mask characterized in that a fluorescent screen forming means is provided downstream of the overcoat layer forming means in the panel conveying path. CRT manufacturing equipment with ark.