KR950001082B1 - Between panel and shadow mask control method and apparatus - Google Patents

Abstract

The method optimizes the image of braun tube by adjusting the gap (PMQ value) between the panel and the shadow mask with a device for controlling the height of the frame holder of a mask-frame welder. The device consists of a mask-frame welder (6) with a frame holder (7) and a lower mold (8) holding a shadow mask, a controller (1) with a gauge (5) having an operating rod (5a), a device (10) controlling the frame holder, and a controller which is fixed to the frame holder by a holder pin(9).

Description

Method and device for adjusting gap between panel of color brown tube and shadow mask

1 is an exploded perspective view showing an example of use of a throttle plate for carrying out the method of the present invention.

2 and 3 are excerpts showing the interval setting method using the above adjustment panel.

4 is an excerpt sectional view showing the moment when the shadow mask and the frame are welded together in a position where the distance set above can be maintained.

5 is a cross-sectional view showing a state in which the welded mask-frame assembly as shown in FIG. 4 is assembled inside the panel of the CRT.

* Explanation of symbols for main parts of the drawings

1: control panel 2: panel

3: stud pin 5: gauge

5a: gauge operating rod 6: mask-frame welding device

7: frame holder 8: lower part

9: holder pin

The present invention relates to a new and useful method and apparatus for easily and precisely adjusting and managing the distance between a panel including a screen portion and a shadow mask installed inside thereof in a color brown tube.

As is well known, inside the panel of the color CRT, the body of which is composed of a panel with a fluorescent screen formed inside and a funnel's funnel, the blue, green, and red electron beams emitted from the electron gun are identified. Each color brown tube is equipped with a color selection structure unique to a shadow brown tube to accurately land on it.In the case of manufacturing such a color brown tube, the shadow mask must be installed at an accurate interval set from the inner surface of the panel to achieve the optimum image quality. With a color-brown tube.

Therefore, the operation of precisely adjusting and managing the interval between the CRT panel and the shadow mask (for example, the interval indicated by the symbol Q in FIG. 5 and referred to as PMQ value) at the predetermined interval when manufacturing the CRT is performed at the set interval. It's a very important task that will determine the quality of the image.

In the CRT manufacturing process, the above-mentioned PMQ value is almost determined in the welding assembly process between the frame and the actual shadow mask, which maintains the shadow mask in a predetermined shape to frame the mask-frame assembly welded to the frame. This is because the shadow mask is installed by fixing the assembly at a predetermined position inside the panel using the fixing structure on the top and the fixing structure on the panel. Therefore, in this mask-frame welding process, when the mask and frame are not welded together in the correct position, the distance between the shadow mask and the panel is required at all positions when the assembly is installed inside the panel. In this mask-frame welding process, it is possible to precisely adjust the welding position between the welding target mask and the frame mutually to the correct position, so that the accurate gap between the desired panel and the shadow mask can be obtained. Therefore, the present invention has been created based on such a point.

Conventionally, the PMQ value is measured and managed through a PMQ measurement plate in which a plurality of sensors are divided into a plurality of places between the completed mask-frame assembly and the panel model to be mounted thereon, or a shadow mask is placed on the mask-frame welding device. PMQ measurement sensors were installed at a number of supported lower molds, and each sensor was connected to a static pressure air generating unit including PMQ value display means to measure and manage the PMQ value between the mask and the frame. In addition, the composition of the device and the inspection and management method of the PMQ value using the same are not only very variable, but also have a high defect rate due to the large error.

The present invention aims to effectively solve the above-mentioned drawbacks and to provide a new and useful method and apparatus which can more easily and accurately adjust and manage the above-mentioned PMQ values, and the detailed description and the effect thereof will be described in detail based on the accompanying drawings. Is as follows.

1 and 2, reference numeral 1 denotes a control plate for performing the method of the present invention, 2 a panel of a conventional color-brown tube, and 3 a conventional stud pin provided for assembling and fixing a mask frame inside the panel 2. Respectively.

On the front, rear, left and right sides of the adjustment plate 1, which is formed of a substantially longitudinal plate body so as to be inserted into the panel 2, the ends of these stud pins 3 must be located at positions corresponding to the stud pins 3, respectively. Downward-opening pin grooves 4 are provided which can be fitted in, and the gauges 5 having the gauge operating rods 5a are provided at plural places, for example, nine places on the adjusting plate 1, and their respective operating rods 5a. ) Is protruded to one side of the adjustment plate 1 (in the drawing, toward the inner surface of the panel 2) and is installed in a predetermined arrangement.

In FIG. 1, inserting the adjusting plate 1, in which the gauges 5 are installed at all necessary positions, toward the inside of the panel 2 in the direction shown, in the pin grooves 4 on the side of the adjusting plate 1, the panel 2 ) The end of each corresponding stud pin (3) is inserted into the adjustment plate (1) horizontally on a predetermined height inside the panel (2), at this time the gauge of each gauge (5) installed on the adjustment plate (1) The actuating rod 5a comes into contact with the inner surface of the panel 2 as shown in FIG. 2, and in this state, the display values of the respective gauges 5 are zeroed.

Next, the adjustment plate 1 of which the zero adjustment of the respective gauges 5 is completed is removed from the panel 2 as described above, and it is separated between the frame holders 7 of the mask-frame welding apparatus 6 as shown in FIG. Install horizontally.

The mask-frame welding apparatus 6 includes components such as a lower mold 8 on which the shadow mask to be welded is mounted and a plurality of frame holders 7 for holding the mask frame in a desired position. The holder plate 9 is provided so that the engaging piece on the mask frame can be inserted and supported inside the upper end of the holder 7 so as to be inserted into the pin groove 4 of the side of the fixing plate 1 so that the adjusting plate 1 is moved to the frame holder 7. If the horizontal bar is installed between the surfaces of the lower mold (8), the working rods (5a) of the gauges (5), which are zero-adjusted on the inside of the panel (2), this time, the shadow mask is placed for welding with the mask frame. Each of the corresponding points of the image is in contact with the third as shown in FIG. 3, wherein the gauge operating rods 5a of each of the gauges 5 that are zeroed are placed on the surface of the lower mold 8, that is, on the lower mold 8 Lost of shadow mask The surface is pushed toward the body of the gauge (5) by a distance corresponding to the distance between the inner surfaces of the actual panel (2) on which the shadow mask is to be mounted (this distance corresponds to the PMQ value). The current PMQ value will be displayed, and this PMQ value is compared with a preset required PMQ value to check whether the two values coincide with each other.

Next, if the numerical value shown on each gauge 5 of FIG. 3 does not match the set PMQ value, the height of the frame holder 7 at the position until the numerical value and the set PMQ value on the gauge 5 coincide. Adjust up and down to match.

In order to enable this, the present invention provides a means (for example, micrometer) 10 for installing the frame holders 7 vertically up and down with respect to the lower mold 8 and adjusting the moving distance thereof. It was installed in the welding device.

When the height adjustment of the frame holders 7 is completed as described above, as shown in FIG. 4, the shadow object 11 to be welded is supported on the lower mold 8, and a conventional coupling piece is provided between the frame holders 7. 12) supporting the mask frame 13, and then spot welding between these shadow masks 11 and the mask frame 13 to complete the welding, thus completing the completed mask-frame assembly in FIG. As such, it can be installed in a state in which the exact PMQ value (Q) of the bar required inside the CRT panel 2 is maintained.

Thus, the present invention is a simple and effective method using means for adjusting the height of the frame holders 7 in the control plate 1 and the mask-frame welding apparatus provided with a plurality of gauges 5 as described above. It is a new useful invention that makes it possible to adjust and manage the distance between the shadow mask and the panel of the color CRT much more easily than before.

Claims (2)

In the apparatus for welding between the shadow mask and the mask frame, the frame holders supporting the mask frame are installed with height adjustment with respect to the lower mold on which the shadow mask is mounted and the height of each frame holder is adjusted with gauge means. Method of adjusting the distance between the panel and the shadow mask of the color brown tube, characterized in that the adjustment setting according to the set reference value using the mask to perform the welding between the mask and the frame. In the stud pin (3) inside the panel (2) or the mask-frame welding apparatus (6), the holder pin (9) on the frame holder (7) is used between the panel (2) or between the frame holder (7). The desired value for the adjusting plate (1) in which a plurality of gauges (5) having a gauge operating rod (5a) on the body that can be horizontally installed and installed therein, and the gauges (5) on the adjusting plate (1) Of the color brown tube including frame holders (7) provided with height adjustments relative to the lower mold (8) and means (10) installed to arbitrarily adjust the movement distance of these frame holders (7). Spacing device between panel and shadow mask.