JPS5918547A - Withstand voltage treatment of color cathode-ray tube - Google Patents

Abstract

PURPOSE:To reduce the defective ratio by a method wherein the withstand voltage treatment common to various kinds of color cathode-ray tubes is performed on the production line followed by retreatment with raised voltage while observing the generation of stray emission only of the cathode-ray tubes generating it. CONSTITUTION:Color cathode-ray tubes mixedly produced on the production line pass in the direction of an arrow in order to be treated with withstand voltage in a withstand voltage treatment device 2, then the first stray emission measuring apparatus 3 measures stray emission while qualified articles are forwarded in the direction of the arrow through a characteristic inspection apparatus 9. On the other hand, the color cathode-ray tubes detected by the apparatus 3 to be generating stray emission undergo the withstand voltage treatment by a withstand voltage selective treatment apparatus 7 able to step up the withstand voltage treatment voltage while observing generation of stray emission. Secondly, being forwarded to the apparatus 9, the color cathode-ray tubes detected by the second stray emission measuring apparatus 4 to be generating stray emission undergo the withstand voltage treatment apparatus 8 thus reducing the defective ratio.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a voltage resistance treatment method for color cathode ray tubes.

[Technical background of the invention and its problems]

In order to improve the withstand voltage characteristics of color cathode ray tubes, high voltage is applied between the electrode connected male to the anode and other electrodes to which low voltage is applied, causing spark discharge and eliminating foreign matter and protrusions on the electrode surface. A common method is to remove and chemically convert the
This high voltage is usually generated by induction coils, Tesler coils, etc.

On the other hand, on the production line, the above-mentioned withstand voltage processing devices are arranged in a line from the lowest applied voltage to the highest, and the shicolor cathode ray tubes are sequentially subjected to withstand voltage treatment for a predetermined period of time by these devices.

In addition, in the multi-tube mixed production fin that manufactures multiple color cathode ray tubes on a series of production lines, even though the size and electron gun structure of the color cathode ray tubes differ depending on the tube type, the special withstand voltage treatment conditions are Because it is very difficult to select a color cathode ray tube in terms of manufacturing technology in terms of equipment costs, the number of defective color cathode ray tubes in the next stray emission process becomes several 109k with the specified withstand voltage treatment. Further, a method of performing voltage resistance reprocessing and a stray emission process is often used, but this method has the problem of disrupting the cane production line and causing failure of the color cathode ray tube.

[Purpose of the invention]

The present invention has been made in view of the conventional problems described above, and provides a color cathode ray tube that can effectively perform voltage resistance treatment even when manufacturing multiple types of color cathode ray tubes on a series of production lines. The purpose of this invention is to provide a withstand voltage processing method.

[Summary of the invention]

That is, in the method for withstanding voltage treatment of color CRTs of the present invention, when multiple types of color CRTs are manufactured on a series of production lines, stray emissions are measured after applying a common withstand voltage treatment to multiple types of Cassie CRTs. However, only for color cathode ray tubes in which this stray emission occurs, the withstand voltage processing voltage is stepped up and the withstand voltage processing is performed again while monitoring the occurrence of stray emissions.

[Embodiments of the invention]

Next, the method for treating the color cathode ray tube withstand voltage according to the present invention will be explained in the first step.
This will be explained with reference to FIGS.

That is, the color cathode ray tubes mixedly produced in a series of production lines pass through the arrow (1) to the common voltage processing device (2).
After being subjected to withstand voltage treatment, the first stray emission measurement device (3) measures the systole emission, and the non-defective products are further passed through the second stray emission measurement device (4) or directly tested for static characteristics. Dynamic characteristic measuring device (
5) Various characteristics are measured and good products are sent out in the direction of arrow (6).

On the other hand, for color cathode ray tubes that generate stray emissions as measured by the first stray emission measuring device (3), withstand voltage selection is selected that allows the withstand voltage processing voltage to be stepped up while monitoring the occurrence of stray emissions. Processing device (withstand voltage treatment is performed by force, and the second stray emission device (4) is used in the same manner as the above-mentioned non-defective product.
Various characteristics are measured by the static property/dynamic property measuring device (5), and non-defective products are sent out in the direction of the arrow (6).

In addition, color cathode ray tubes that are judged to be non-defective by the first stray emission measuring device (3) and which generate stray emissions by the second stray emission measuring device (4) are further subjected to withstand voltage processing in the withstand voltage processing device (8). done, second
Various characteristics are measured by the stray emission measuring device (4) and the static characteristic and conflict characteristic measuring device (5).
6) is sent out in the direction. In the figure, the second stray emission measuring device (4) is installed in the characteristic testing device (9) shown by the broken line. ) is included.

Next, as shown in FIGS. 2 and 3, the withstand voltage selection processing device (7) is connected to the anode Q4 of the color cathode ray tube through a protective resistor.
Figure POS. 1 to POS. 5 waveform 0υ1.34 (c) 0荀0!19, the withstand voltage processing voltage generator Ia 荀 is capable of gradually stepping up the withstand voltage processing voltage and applying a constant voltage (up to) according to the stray emission inspection regulations. A stray emission detection device u! consisting of a photomultiply placed in contact with the panel. The signal from 9 is fed back to the withstand voltage processing voltage generator α via the power supply H.
If there is stray emission, the applied voltage is gradually increased to POS. 1, POS, 2゜POS, 3,
POS, 4, POS, 5, etc., the applied voltage is increased to the permissible voltage.

〔Effect of the invention〕

By providing the withstand voltage selection processing device as described above, the number of color cathode ray tubes that require reprocessing in the characteristic testing device (9) is reduced. There was no need to continue using color cathode ray tubes, and as a result, it became possible to almost eliminate defects in color cathode ray tubes due to voltage resistance treatment.

[Brief explanation of drawings]

1 to 3 are diagrams for explaining the withstand voltage processing method for color cathode ray tubes according to the present invention. FIG. 1 is a block diagram showing each step, and FIG. 2 is a simplified explanatory diagram of a withstand voltage selection processing device. FIGS. 3A and 3B are waveform diagrams of the stepped-up suppressing voltage processing pressure applied to the anode. 2.8... Voltage processing device 3.4... Emission detection device 5... Static characteristics. Dynamic property testing device

Claims (1)

[Claims] When manufacturing multi-tube color CRTs on a series of production lines, the stray emissions are measured after the multi-tube color CRTs are subjected to a common withstand voltage treatment, and only the color CRTs where the stray emissions occur are measured. A withstand voltage processing method for a color cathode ray tube, characterized in that the withstand voltage processing voltage is stepped up and the withstand voltage processing is performed again while monitoring the occurrence of the stray emission.