JP3551840B2 - Glass bulb for cathode ray tube - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a glass bulb for a cathode ray tube having a two-dimensional code composed of a plurality of dots on a predetermined portion of an outer surface, a method for manufacturing the glass tube for a cathode ray tube, and a method for manufacturing a cathode ray tube using the glass bulb for a cathode ray tube.
[0002]
[Prior art]
A method for directly writing glass bulb information and work condition information (including work content information) as marking characters or codes on the outer surface of a glass bulb for a cathode ray tube (hereinafter, referred to as a glass bulb), and reading and reading these to control a manufacturing process. Is conventionally known. Writing on the outer surface of the glass bulb is usually performed by direct printing or labeling with a heat-resistant material, or by sandblasting or laser printing.
[0003]
For example, Japanese Patent Application Laid-Open No. 2-87442 proposes a manufacturing management method in which a bar code is printed by using a CO ₂ gas laser masking method, and reading of the bar code prevents a component combination error that occurs at the time of manufacturing a cathode ray tube. ing. It is also known from Japanese Utility Model Application Laid-Open No. 63-202051 to grasp the product content from marking characters written by a laser.
[0004]
However, these conventional methods of writing marking characters or codes by printing, laser masking, or the like have the problem that all information must be rewritten one by one for each product. For example, in the laser masking method, since writing is performed using laser light that has passed through a mask, the contents of the written information cannot be changed without changing the mask. Can not respond. For this reason, the marking characters and barcode information up to now are restricted by the amount of writable information, and the type (size), the transmittance of the glass bulb, the presence or absence of surface antireflection treatment, the specification of the production line, etc. Limited unique information on valves and information on working conditions etc. are managed for each group, corresponding to mass-produced products, and not suitable for use as information means for individually identifying glass bulbs .
[0005]
As a result, the information written by the glass bulb manufacturer, including marking characters and other characters displayed by other methods, is used by the cathode ray tube manufacturer for the marking characters and barcodes printed on the outer surface of the conventional glass bulb with laser. Even so, the information required by the cathode ray tube maker is insufficient, so the cathode ray tube maker independently writes the unique information with marking characters and bar codes as described above, and manages the manufacturing process. Therefore, the conventional marking characters and barcodes are not shared by both glass bulb and cathode ray tube manufacturers.
[0006]
A general method of printing marking characters and bar codes on glass with a laser is known. However, on a glass surface that is transparent and not flat like a glass bulb, and has a matte-like fine unevenness on the surface, marking characters and the like that can correspond to a large amount of information that can individually identify the glass bulb are printed. There has not been proposed an effective method for reading the image using an image sensor.
[0007]
Further, in the process of manufacturing a panel and a funnel of a conventional glass bulb manufacturer, in a process of forming, processing, polishing, and the like, a combination of a work line, a mold, a forming device, a processing device, and the like is extremely wide. Therefore, when a trouble or defective product occurs, it takes a long time to track it, but no appropriate solution has been proposed yet.
[0008]
Furthermore, in the manufacturing process of such a glass bulb, for example, the one manufactured in the same die or the same apparatus in the forming process is intentionally optimally combined with the next polishing process in which many lines are present. There is also a problem that it is difficult to supply. This may be the same for cathode ray tube manufacturers.
[0009]
In other words, in the conventional marking characters and codes, due to the restriction due to the amount of information to be written and the difficulty in writing the marking characters and the like to the glass bulb, the method of use in the respective manufacturing processes of the glass bulb manufacturer and the cathode ray tube manufacturer There is no known method for producing a glass bulb and a cathode ray tube that can be used at least by both manufacturers and that eliminates the need for a cathode ray tube manufacturer to print marking characters or the like on its own.
[0010]
On the other hand, in recent years, with the spread and spread of conventional barcodes, there has been a need for coding more information, printing in a smaller space, and the like. Two-dimensional codes are known as corresponding to these needs. This two-dimensional code is a code display method in which information is written in both horizontal and vertical directions, that is, two-dimensional directions, and various display forms are known. However, the application of a two-dimensional code to a glass bulb, particularly the application of a two-dimensional code formed from a plurality of dots, has not yet been studied, and further, a glass bulb is specified by such a two-dimensional code consisting of a plurality of dots. It is not known that the production process of the glass bulb and the cathode ray tube is appropriately controlled through the two-dimensional code printed on the glass bulb.
[0011]
[Problems to be solved by the invention]
SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned disadvantages of the related art. In a predetermined portion on the outer surface of a glass bulb, information that can be shared by a glass bulb manufacturer and a cathode ray tube manufacturer and that can individually specify a glass bulb is provided. It is an object of the present invention to provide a glass bulb on which a two-dimensional code composed of a plurality of dots can be printed, and a manufacturing method for managing the manufacturing process of the glass bulb or the cathode ray tube through the two-dimensional code.
[0012]
[Means for Solving the Problems]
The present invention has a two-dimensional code composed of a plurality of dots printed by a laser on the outer surface, and the dots are formed of concave portions having a depth of 5 to 100 μm and a diameter of 50 to 400 μm, for a cathode ray tube. Provide glass bulbs.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
In the present invention, a two-dimensional code including a plurality of dots is printed on a predetermined portion on the outer surface of the glass bulb for a cathode ray tube. Here, the glass bulb refers to any one of a panel for a color cathode ray tube (hereinafter, referred to as a panel), a funnel for a color cathode ray tube (hereinafter, referred to as a funnel), a black and white glass bulb, and a glass bulb for a projection tube. In the case of a panel and a funnel, the two-dimensional code is usually printed on both of them, but may be printed on only one of them.
[0016]
The two-dimensional code according to the present invention is configured by arranging a plurality of dots in a two-dimensional direction, that is, in a vertical and horizontal direction. Although the basics of the two-dimensional code are substantially the same as those known so far, they will not be described in detail, but the feature is that information is specified by the dot arrangement position. The information amount of the two-dimensional code can be appropriately adjusted by increasing or decreasing the number of dots and the arrangement of the dots.
[0017]
The shape of the dot constituting the two-dimensional code is not conscious of the thickness of the line like a so-called bar code, but can be recognized as a point such as a circle or an ellipse, and is usually a circular shape. preferable. When a two-dimensional code is printed by arranging dots, the two-dimensional code is usually printed in a matrix format such as a data matrix (Data Matrix) or a vericode (Veri Code). May be used.
[0018]
In the present invention, a laser is particularly preferable for actually printing a two-dimensional code as a concave portion using dots on the outer surface of the glass bulb. The main reason is that even if the laser has fine irregularities on the printing surface of the glass bulb, it is possible to accurately and quickly print dots that can be automatically read by the sensor if you properly select the shape of the concave part that forms the dot Because.
[0019]
Furthermore, the two-dimensional code printed on the outer surface of the molded glass bulb must be chemically and physically durable in the subsequent glass bulb manufacturing process and cathode ray tube manufacturing process. In particular, since the cathode ray tube is subjected to a heat treatment at a high temperature of about 440 ° C. in the manufacturing process, it is necessary to be able to withstand the heat, and laser printing can satisfy almost all of these.
[0020]
One example of a two-dimensional code dot printed on a glass bulb with a laser is shown in FIG. The dots are formed as concave portions 26 having a circular or substantially circular planar outline on the glass surface. In FIG. 3, L is the diameter of the concave portion 26, and d indicates its depth. A projection 25 is usually formed around the recess 26. The depth d of the concave portion 26 when the projection 25 is formed is based on the top of the projection 25 as illustrated. The shape of the inner surface of the concave portion 26 is not particularly limited, but is substantially as shown in FIG.
[0021]
FIG. 4 shows another shape of the concave portion 26. When the depth d of the recess 26 becomes too large with respect to the pitch, the adjacent recesses 26 may be connected as shown in the drawing. In this case, the diameter L and the depth d of each recess 26 are measured as shown. The concave portion 26 is formed as a substantially circular dot, but if it is not circular, it has the maximum diameter.
[0022]
In order to accurately read the two-dimensional code, it is necessary to control the depth d and the diameter L of the concave portion 26 to be constant. The reading of the two-dimensional code is affected by the performance of the reading device, the size (diameter) of the dot, the surface properties of the printing surface, and the like. The depth d of 5 to 100 μm is appropriate for an ordinary glass bulb. In particular, 10 to 50 μm is desirable. Further, the diameter L is suitably from 50 to 400 μm, particularly preferably from 90 to 250 μm. In general, as the depth d decreases, the diameter L decreases. Therefore, when d is less than 5 μm, L is also less than 50 μm, making it difficult to read a two-dimensional code accurately.
[0023]
On the other hand, when d exceeds 100 μm and L exceeds 400 μm, not only is it difficult to print with a laser, but also chatter easily occurs around the concave portion 26, or strength reduction occurs due to an excessively large concave portion. When vacuum stress acts on the glass bulb, breakage occurs, which is not preferable. Since the projection 25 around the concave portion 26 raises the glass with respect to the glass surface, it has the effect of increasing d and enhancing the brightness of the reflected light from the dot to facilitate detection.
[0024]
Further, it is preferable that the concave portion 26 of the dot forming the two-dimensional code has a depth d / diameter L of 0.04 to 0.60. It is particularly desirable that d / L is 0.09 to 0.35. The recess 26 having a d / L of less than 0.04 has a small depression and is not optically noticeable. For this reason, when reading a two-dimensional code, it is not possible to sufficiently obtain the brightness of the dots, and it is difficult to accurately recognize the dots. In the case of a glass bulb, this tendency is remarkable because the surface 28 generally has not a mirror surface but fine irregularities.
[0025]
In addition, a concave portion having a d / L of greater than 0.60 has a sharp concave portion, which tends to cause chatter at the periphery of the concave portion, or has a sharp and relatively deep concave portion. become weak. As a result, when the cathode ray tube is used, the concave portion is likely to cause breakage, which is not preferable.
[0026]
It is desirable that the printing surface of the glass bulb be as smooth as possible irrespective of the printing method. However, in printing by laser, fine unevenness on the printing surface is allowed in the following range. That is, when the printing surface of the glass bulb having fine irregularities is irradiated with light from a direction of 5 to 85 degrees with respect to the normal of the surface, the intensity of light and darkness by the dots of the two-dimensional code formed on the printing surface and Any surface roughness may be used so that the S / N ratio of the intensity of light and darkness due to the unevenness or the like becomes 1.5 or more. Here, the intensity of the light and dark due to the unevenness means the intensity of the light and dark caused by the unevenness itself and other noises. If the S / N ratio is smaller than 1.5, it becomes difficult to decode the two-dimensional code.
[0027]
In a preferred embodiment of the present invention, in order to eliminate or minimize the influence of the surface roughness of the printing surface, it is recommended that the printing surface of the glass bulb be partially a mirror surface or a smooth surface close to the mirror surface. You. Such smoothing can be easily obtained by surface treatment of a molding die or polishing after molding.
[0028]
Although the position of the printing surface when printing a two-dimensional code on a glass bulb is not specified, it is usually sealed at the center of the long side of the glass bulb due to the ease of printing and reading work and the flatness of the outer surface of the glass bulb. The area near the end face is selected as the optimum position. Further, in order to improve the flatness of the printing surface, a flat or almost flat pedestal or depression may be provided in the printing portion of the glass bulb. These pedestals or depressions may be mirror-finished to smooth the surface.
[0029]
Next, information to be written in the two-dimensional code will be described. The two-dimensional code according to the present invention includes a base composition, a kind name, a part arrangement, a product size, a wall thickness, a production date, a molding die, presence or absence of surface treatment, and serial information for individually specifying a glass bulb or a cathode ray tube. The information includes one or two or more types selected from proper information and operation information such as a processing line, a processing operation, and processing conditions in a manufacturing process of a glass bulb and a cathode ray tube. The two-dimensional code of the most preferred embodiment has at least information that can individually specify the glass bulb, that is, serial information.
[0030]
The serial information gives each glass bulb a number, for example, so that it can be clearly distinguished from others in the manufacturing process of the glass bulb or the cathode ray tube. As a result, if this uniform number is associated with a control device such as a computer, the specific information of the glass bulb such as the size, wall thickness, production date, base composition, molding die, presence or absence of surface treatment of each glass bulb, etc. And / or work information such as a processing line, a processing operation, and processing conditions in a manufacturing process of the glass bulb and the cathode ray tube can be appropriately taken out from the control device, and the manufacturing process can be managed using the serial information.
[0031]
For example, if a bulb manufacturer provides dimensional information about each glass bulb together with its serial information to a cathode ray tube maker, the cathode ray tube maker reads the information at the time of manufacturing the cathode ray tube, and utilizes this dimensional information to utilize the cathode ray tube. Can be assembled. As a result, the quality and yield of the cathode ray tube are improved.
[0032]
In this case, part or all of the unique information and work information except for the serial information on the glass bulb is input to another recording medium in correspondence with the serial information, and based on the serial information printed on the glass bulb. You may make it take out suitably from a leverage recording medium.
[0033]
As another information writing example of the two-dimensional code, there is a method of writing at least a part of the unique information and the work information together with the serial information in one two-dimensional code. According to this method, information or data on the glass bulb can be taken out and used at any time by reading the two-dimensional code. Further, the two-dimensional code and a character character or the like for displaying the two-dimensional code may be printed together so that the unique information written in the two-dimensional code can be visually confirmed. If these character characters and the like are input in advance to a two-dimensional code, for example, a laser printing device, the character characters and the like can be printed simultaneously with the printing of the two-dimensional code using dots without a special device.
[0034]
Furthermore, the present invention is not limited to glass bulbs, but can be applied to glass products such as automotive glass, for example, display substrate glass such as TFT.
[0035]
【Example】
Next, embodiments of the present invention will be specifically described with reference to the drawings.
FIG. 1 shows a data matrix type two-dimensional code 3 and characters representing the unique information of the funnel written in the two-dimensional code at a position on the outer surface 20 mm higher than the sealing end surface 2 at the center of the long side of the funnel 1. No. 4 was printed by laser marking. The serial information for specifying the funnel is written in a two-dimensional code composed of a plurality of dots. The size of the two-dimensional code 3 is 6 mm square, the depth of the dot is about 20 μm, and the diameter is about 150 μm.
[0036]
FIG. 2 shows a data matrix type two-dimensional code 3 and characters 4 printed at a position 30 mm away from the mold match 6 on the long side of the panel 5 in the same manner as the funnel 1 of FIG. Regarding the size of the two-dimensional code 3, the depth and diameter of the dot are the same as those of the funnel 1 described above. These funnel and panel dots had a depth / diameter of 0.15.
[0037]
FIG. 5 is a schematic diagram when the two-dimensional code 3 is printed on the panel 5. The two-dimensional code 3 is printed on the panel 5 formed from the molten glass by a forming device (not shown) by a laser printing device 8 on a conveyor 7 to be conveyed to the next step. In this example, printing was performed at the same position as in FIG. 2 with the surface temperature of the panel being about 380 ° C. When a two-dimensional code was continuously printed on 50 panels 5 using this apparatus, no cracks or chatter occurred in the dots of the two-dimensional code.
[0038]
The panel 5 on which the two-dimensional code was printed was sent to the reading device shown in FIG. 6, and the two-dimensional code 3 was read on the conveyor 9 using the CCD camera 11 as an image sensor, and was decoded by the image processing device 12. At this time, the angle of the diffusion light source 10 (the angle 13 with the normal 27 shown in FIG. 7) was set to 30 degrees. As a result, it was possible to accurately read the two-dimensional codes of all of the 50 panels, and to confirm that each panel was individually specified by the serial information written in the two-dimensional code 3.
[0039]
Next, an example of use in a glass bulb manufacturer will be described.
FIG. 8 shows an example of a panel. A two-dimensional code is printed on a molded panel (not shown) using a laser printing device 8 at a surface temperature of about 380 ° C. Then, a two-dimensional code reading device is installed in each process such as processing, polishing, inspection, and packaging of the panel. In FIG. 8, for example, a reading device 23 is provided in the processing step 21 and a reading device 24 is provided in the polishing step 22, respectively. At this time, for example, the number of the used processing machine or polishing machine is associated with the individual number recorded in the read two-dimensional code by the host computer 16.
[0040]
Therefore, by comparing the individual number of the two-dimensional code with the host computer 16 in the final packaging stage, the history of the panel can be fully grasped. When a trouble occurs, by examining the two-dimensional code of the product, the cause of the trouble can be grasped more quickly than before. Thereby, the production yield can be improved. The method of using such a two-dimensional code is the same for a funnel.
[0041]
FIG. 9 shows another example of use in a panel at a glass bulb manufacturer. Similarly, a two-dimensional code is printed on the formed panel using the laser printing device 8 at a surface temperature of about 380 ° C. Each time this panel passes through each of the processing steps 21, a two-dimensional code is read by a reading device 23 installed in that step, and a machine or a pressed die or the like on which this panel has been processed is read by a host computer. 16 and record it. The panel that has completed the processing step is continuously fed to the polishing step 22 of the next step.
[0042]
In FIG. 9, three processing steps 21 and four polishing steps 22 are provided, but each reference numeral is represented by one series. When the panel is sent to the polishing step 22, the two-dimensional code printed on the panel is read by the respective reading devices 24 installed in each polishing step 22. Then, a panel manufactured by a machine of an optimum type or an optimum mold or a processing process for the polishing process is collated and selected in the host computer 16 and selectively supplied to a polishing line that matches the panel.
[0043]
As a result, processing and polishing can be performed with a more optimal combination, which leads to an improvement in manufacturing yield. In the past, a person had to visually check and change the polishing line to the optimal polishing line, but this work can be eliminated. Further, it is possible to reduce the number of transporting facilities connecting each processing step and each polishing step.
[0044]
The examples of the processing step and the polishing step have been described above, but the same applies to each of the steps of molding and processing, processing and polishing, polishing and inspection, inspection and packaging. Further, it can be similarly applied to a funnel.
[0045]
FIG. 10 shows an example of a case where a two-dimensional code printed on a glass bulb (panel, funnel) according to the present invention is shared and utilized by the glass bulb manufacturer 14 and the cathode ray tube manufacturer 19. The glass bulb manufacturer 14 uses the laser marking device 8 to create a two-dimensional code 3 incorporating the unique information of the glass bulb indicating the date of manufacture, the composition of the base material, the properties of the glass bulb, and the serial information for individually specifying the glass bulb, and the unique information. Is printed (see FIGS. 1 and 2).
[0046]
When the panel 5 and the funnel 1 are delivered to the cathode ray tube maker 19, the individual number specified by the two-dimensional code 3 is read by the reading device 15. From the information stored in the host computer 16, specific information required by the cathode ray tube maker of each glass bulb corresponding to the individual number, for example, data such as a product type, a transmittance, a pin position, and a meat pressure is extracted. These data are input to the flexible disk 17 and supplied to the cathode ray tube maker 19 together with the glass bulb.
[0047]
The cathode ray tube maker 19 associates the information with the individual numbers of the two-dimensional code in the host computer 18 based on the information of the flexible disk 17 and the information necessary for the production management of the cathode ray tube maker. After that, the panel 5 or the funnel 1 on which the two-dimensional code 3 is printed exchanges necessary information with the host computer 18 in accordance with the two-dimensional code 3 read by the reading device 20 each time, and manages a manufacturing process. Here, necessary information can be transmitted via, for example, a network without using the flexible disk 17, and there is no particular limitation as long as it is a means for transmitting information.
[0048]
The cathode ray tube maker 19 can also propose another method. The content of the two-dimensional code 3 is read by the reading device 20 from the panel 5 or the funnel 1 on which the two-dimensional code 3 is printed at the time of insertion. As a result, the information on the panel 5 or the funnel 1 that has been obtained visually can be read mechanically. Next, the host computer 18 associates the information on the manufacturing process of the cathode ray tube maker stored in advance with the read information, and specifies the information necessary for the production control of the cathode ray tube maker so as to conform to the panel or the funnel. I do.
[0049]
In the cathode ray tube manufacturing process of the cathode ray tube manufacturer, when the panel 5 or the funnel 1 is supplied, the host computer 18 selects the specified information by the two-dimensional code 3 printed on the panel 5 or the funnel 1, and the manufacturing process. Manage.
[0050]
【The invention's effect】
According to the present invention, at least information or data relating to the glass bulb is printed with a two-dimensional code composed of dots, and when forming the dots as recesses, by setting the depth and diameter of the recesses to a desired size. The two-dimensional code can be accurately printed with a laser and read by an image sensor. As a result, both the glass bulb manufacturer and the cathode ray tube manufacturer can share the information specified by the two-dimensional code, so that the management of the manufacturing process can be made more efficient, the range of manufacturing management at each manufacturer can be expanded, and the production cost can be increased. Can be reduced and the yield can be improved.
[0051]
Since the printing is performed by laser, it is possible to eliminate the expensive printing by sand blast which has been conventionally used by glass bulb makers, and the cathode ray tube maker does not need to attach expensive heat resistant labels or the like.
[0052]
In addition, if the serial information of the glass bulb is incorporated into this two-dimensional code, each manufacturer can use the serial information and the information required by each manufacturer in a computer when using manufacturing management and product information. Can be associated and shared. As a result, the data of the glass bulb specified by the two-dimensional code can be supplied from the glass bulb manufacturer to the cathode ray tube maker by using a flexible disk or the like, and the work of the preparation and input work of the printing which the cathode ray tube manufacturer has conventionally performed can be omitted. .
[0053]
In addition, glass bulb manufacturers and cathode ray tube manufacturers can easily check the history of the glass bulb by referring to the host computer from the serial information, so if a trouble occurs, the cause of the trouble As a result, the manufacturing yield can be improved.
[Brief description of the drawings]
FIG. 1 is a front view showing an example of printing a two-dimensional code on a funnel.
FIG. 2 is a front view showing an example of printing a two-dimensional code on a panel.
FIG. 3 is an enlarged sectional view of a dot printed by a laser.
FIG. 4 is an enlarged sectional view of another dot printed by a laser.
FIG. 5 is a perspective view of a two-dimensional code printing device using a laser.
FIG. 6 is a perspective view of a reading device of a two-dimensional code printed by a laser.
FIG. 7 is an explanatory diagram showing a relationship between incident light and reflected light in a two-dimensional code reading device printed by a laser.
FIG. 8 is a schematic diagram showing an example of utilizing a two-dimensional code in a glass bulb manufacturer.
FIG. 9 is a schematic diagram showing another example of using a two-dimensional code in a glass bulb manufacturer.
FIG. 10 is a schematic diagram showing an example of utilizing a two-dimensional code in a glass bulb manufacturer and a cathode ray tube manufacturer.
[Explanation of symbols]
1: funnel 3: two-dimensional code 5: panel 8: laser printer 11: CCD camera

Claims (5)

The outer surface has a two-dimensional code composed of a plurality of dots printed by a laser, the dots being formed with concave portions having a depth of 5 to 100 μm and a diameter of 50 to 400 μm , and the concave portions of the dots having a depth / diameter of Is in the range of 0.04 to 0.60 . The two-dimensional code is composed of a base composition, a product name, parts arrangement, product dimensions, and specific information such as serial information for individually specifying a glass bulb or a cathode ray tube for a cathode ray tube, and operations such as a processing line, a processing operation, and processing conditions. 2. The glass bulb for a cathode ray tube according to claim 1, wherein the information includes at least serial information. The surface on which the two-dimensional code is printed has irregularities, and the intensity of the two-dimensional code dots when irradiating light from a direction of 5 to 85 degrees with respect to the normal to the surface and the irregularities and the like 3. The glass bulb for a cathode ray tube according to claim 1, wherein the S / N ratio of the intensity of light and darkness is 1.5 times or more. The outer side surface, a flat surface or flat seat or recess is provided near the base or the two-dimensional code for cathode ray tube glass bulb of claim 1, wherein printed on the recesses. 5. The glass bulb for a cathode ray tube according to claim 1, wherein the surface of the portion on which the two-dimensional code is printed is a mirror surface or a state close to the mirror surface.

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