JPS61148745A - Manufacture of color cathode-ray tube - Google Patents

Abstract

PURPOSE:To realize improvement of productivity with quality control being speedily performed without execution of extra processes by inspecting individual cathode-ray tubes whenever each process being finished, and controlling advance of the process by computer. CONSTITUTION:Miscellaneous symbols and figures are indicated on the face plate side wall or the like of a color cathode-ray tube, and they are read out and inputted into computer for control. Inspection, which is beforehand assigned in every process of a cathode-ray tube production line, is executed to input the data, which are compared with normalized values memorized beforehand, into computer, so as to judge them to be good or faulty. The cathode-ray tube judged to be faulty is indicated showing that it is faulty, being controlled to be removed from the production line, and then automation can be executed without stopping the line by advancing only good product in order into the next process. Faulty products can be detected in an earlier process, therefore, a high speed in part and production and improvement of yield can be realized.

Description

[Detailed description of the invention] [Technical field of invention] Jin's invention relates to a method for manufacturing cathode ray tubes.

[-Technical background of the invention and its problems] It is well known that the production line for color cathode ray tubes has been automated for a long time using belt-compare lines and the like.

On a production line like this, sampling inspections were conducted at each process, and once a color cathode ray tube was completed, a 100% inspection was conducted in the final process to determine which products were good and which were defective.

The analysis of this data involves testing the average value and range of all data using the X-R management method.

Instantly analyze a large amount of quality data covering a large number of items
It was difficult to say.

Therefore, it is not a problem even if a defect occurs in the middle of the production line.

Furthermore, when a line defect occurs, the true cause is discovered by the experience and intuition of a skilled person, and there is a drawback that it relies on the ability of the engineer.

Furthermore, it is difficult to quickly analyze one piece of quality data for a long time to discover the cause of a defect, and since the inspection is performed after the manufacturing process is completed, once a defective product is produced, many more are produced in succession. moreover.

We had no choice but to completely stop the line and defend against the flies. When there are many causes of good or bad products, it is difficult to investigate the correlation between them and the causes that occur before the process. - [Object of the invention] The object of the present invention was made in view of the above points.

In the color cathode ray tube production line, each cathode ray tube is inspected after each process and evaluated each time, so it provides a method for manufacturing color cathode ray tubes that allows quick quality control without performing extra steps. .

[Summary of the invention]

This invention provides a means for reading and inputting symbols marked on tube walls in a color cathode ray tube manufacturing line into a computer, and a means for performing predetermined inspections on the read color cathode ray tubes in accordance with the raw materials used in each process, and then inputting the symbols marked on the tube wall into a computer. and compare it with the standard value stored in advance in the above calculator.
a means for determining "good" or "defective"; a means for displaying that the color cathode ray tube is "defective" when determined as "defective" by this means; The present invention provides a method for manufacturing a cathode ray tube, which is equipped with means for estimating the total W and timing and controlling proceeding to the next process or leaving the production line.

[Embodiments of the invention]

Next, embodiments of the method of the present invention will be described with reference to the drawings. Since the manufacturing process of cathode ray tubes is well known in the industry,
Detailed steps will be omitted from description.

A case will be described in which the process is carried out after the phosphor is coated on the inner surface of the face plate of the cathode ray tube.

(Cathode ray tube faceplate) Also, 7z - Assign a number to each cathode ray tube. Inspection is performed at the end of each harvest after the process input into the computer (Step B). For example, the process of joining the neck of a cathode ray tube to the 7Ace plate, and the process of attaching the stem to which the electron gun is attached.

Inspection is performed after each process such as the exhaust process, gettering process, aninyl process, and enging process. In this inspection, for example, after the evacuation process, the degree of vacuum of the evacuated color cathode ray tube is measured, and the measurement result is input into a computer as an electrical signal. The computer performs one analysis process (step D). The analysis process can use, for example, the X-R method, multivariate analysis 9 regression analysis, or the like. That is, the computer compares the degree of vacuum with two standards stored in advance and determines whether it is "good" or "bad" (step E). In the case of "&", the computer outputs a signal to the production line to proceed to the next process, but in the case of a defect, the computer selects a countermeasure or effective means corresponding to the content. In other words, if it is within the range that can be repaired by gettering depending on the actual value of the degree of vacuum, is it a bra? The program automatically controls the tube to return to the gettering process and perform the gettering process again (these means are collectively referred to as inference) (Step G). The contents of the above are stored in advance in the computer's memory 9, and the cathode ray tube is automatically guided to the optimal repair contents and gettering process.

To make the above inferences and arguments, it is time to measure at the same time! Border data is also entered into the computer as a concubine. For example, it can be used in conjunction with the guidelines for correcting measured values such as ambient temperature, humidity, and the number of pieces of dust (
Step C).

If the result of the inference by the computer is "defective", a control signal from the computer displays an indication that the cathode ray tube is "defective", and the above-mentioned repair process or removal from the production line is selected. .

Furthermore, abnormalities that may occur in the future are predicted and inferred from various measured values during the rod process. If the probability is higher than a certain value, a forecast is also made.

Prescriptions to prevent abnormalities from occurring are also controlled by computer. In this way, the optimum manufacturing means is selected for each manufactured cathode ray tube, which has the effect of greatly contributing to improving the yield. Furthermore, once the database is created, it can be kept as a manufacturing history, and even after the product is shipped to the market, it can be used immediately as a reference material for troubleshooting problems.

Furthermore, inspection results after each process can be recorded.
K can also be applied to improve quality, improve characteristics, and review processes (manufacturing conditions).

Furthermore, in the past, quality control on mass production lines only involved spot inspections or 100% inspections to classify pass/fail, but with the application of this system, data that can cause quality abnormalities can be controlled. It is possible to automatically collect the information, and by matching it with the product number assigned to the product, it is possible to immediately analyze the true cause and provide feedback.
Subsequent product defects can be prevented.

Sara K again. By accumulating past data, it is possible to infer the occurrence of defects that may occur in the future based on the current data, and issue a forecast, thereby making it possible to prevent the occurrence of defects.

Furthermore, once an abnormality occurs, it is determined whether it can be repaired or not, and the process is assigned to that process. 1+ Even if the product cannot be repaired, it is possible to make effective use of the product by determining whether parts can be reused and reassigning the process if possible.

In addition to the above examples, for products that are mass-produced and the factors that affect their quality have been investigated, this manufacturing method is effective if the data can be collected automatically or by humans. It is.

Furthermore, by linking with automatic control within the process, feedback and feedforward from the manufacturing method becomes possible.

〔Effect of the invention〕

As explained above, according to the method of the present invention, each cathode ray tube is inspected at each step and the progress of the process is controlled by a computer, so defects can be detected in an early process for each cathode ray tube. It has the effect of contributing to

Moreover, since defects or items likely to become defects can be detected at an earlier stage of the process, many items can be saved by controlling manufacturing conditions. In other words, it contributes to improving yield.

[Brief explanation of drawings]

The figure is a flowchart for explaining an embodiment of the method of the present invention. Agent: Patent attorney Kensuke Chika (and 1 other person)

Claims (1)

[Claims] (1) A means for reading symbols marked on the tube wall in the color cathode ray tube manufacturing line and inputting them into the computer, and a means for reading the symbols marked on the tube wall and inputting them into the computer, and performing predetermined inspections on the read color cathode ray tubes at each process and inputting them into the computer. and compare it with the standard value stored in advance in the above calculator to determine whether it is "good".
means for determining "defective"; means for displaying that the color cathode ray tube is "defective" when it is determined to be "defective" by the means; 1. A method for manufacturing a color cathode ray tube, comprising means for estimating and controlling progress to the next process or exit from the production line.