KR830002885B1 - Method of manufacturing cathode ray tube - Google Patents

Abstract

No content.

Description

Method of manufacturing cathode ray tube

1 is a longitudinal sectional view of a glass tube portion disposed around a stepped mandrel.

FIG. 2 is a longitudinal sectional view showing a state in which the glass tube part of FIG. 1 is sucked with respect to a mandrel.

3 and 4a, 4b and 4c are partial longitudinal cross-sectional views of a cathode ray tube manufactured using a glass tube portion sucked similarly to FIG.

5 and 6 are longitudinal cross-sectional views of a second embodiment of the present invention.

7 is a schematic view of a television imaging tube obtained by the method of the present invention.

8 is a partial schematic longitudinal sectional view of a second embodiment of a television imaging tube manufactured by the method of the present invention.

9 is a partial schematic longitudinal sectional view of a third embodiment of a television imaging tube manufactured by the method of the present invention.

The present invention is a method of manufacturing a cathode ray tube which is configured to be a tubular physiological container so that one end of the tubular glass container is disintegrated into one window, and the target is fixed on its inner surface, and the electrode is installed on its front surface. It is about.

The invention also relates to a cathode ray tube produced by the method.

Such a cathode ray tube has a wide range of uses, and is also used as a display tube (water tube) in an apparatus for displaying color television images, for example. In this case, the target is a display screen and the electrode is a color selection electrode, for example, a shadow mast. This cathode ray tube is also used as an imaging tube. In this case, the target is a photoconductive layer and the electrode is a gaze electrode for satisfactorily landing an electron beam on the photoconductive layer.

The manufacturing method as described above can be known from the Dutch Kingdom Patent Publication No. 7307168.

Described here is the formation of several holes in the wall of the container (environment), which are sealed with a plug of indium or indium-containing material, which is used to place the reticulated electrode at a location slightly away from the window in the container. As a method of sealing and fixing, a window for closing the container is fixed to the abrasive edge of the tubular portion of the container by an indium sealing ring. However, the method of connecting the electrode and the window is complicated and difficult, which is not very suitable for mass production.

Although US Patent No. 2,938,134 discloses a discharge tube in which a plurality of electrodes are fixed in a container, this forms a plurality of shoulder parts having different diameters in the container, and supports the electrodes against these shoulder parts. Such containers are made by forming thick walled glass containers to form these shoulder portions. However, these methods are also very demanding and are not suitable for mass production.

The present invention provides a very simple method to form a mating surface with the correct dimensions for the electrode and the window, and at the same time an external reference plane for the tubular and radial positions can be installed coincident to the mating axis and the mating surface in one operation. It is to provide a method for producing a cathode ray tube.

The method according to the present invention is manufactured from the tubular glass container because it sucks the glass tube portion heat-softened against a mandrel having a radius that increases stepwise over an at least twice step from the shaft to the end of the tube portion. The wall portion is formed as a mating surface for the electrode, and the second wall portion is formed as a mating surface for the window. If necessary, at least one of the containers extending from the second wall portion toward the edge of the pipe portion may be removed.

As such, it is known to aspirate a tube softened by heating to a mandrel and is described in Dutch Patent Specification No. 911 and US Patent Specification No. 2,531,394. The present invention utilizes this.

According to the present invention, not only can the cathode tube be precisely dimensioned in a single operation by suction to the mandrel, but also the mating surfaces of the cathode ray tube can be arranged very accurately with respect to each other and to observation.

If the third wall portion is formed with an inner side surface perpendicular to the observation of the portion extending between the second wall portion and the end of the tube portion in the same operation as forming the first and second wall portions, at least a portion of the third wall portion is a cathode ray in any device. It is formed as a reference surface that serves to position the tube, and at least a portion of the inner surface of the township tube portion located between the second wall portion and the third wall portion is a reference surface for positioning in the radial direction when the cathode ray tube is installed in the apparatus. This positioning is for positioning a cathode ray tube in a case or for placing a projection device or an imaging tube in an optical application, ie a color separation prism installed in a television camera.

In order to form the reference surface, in most cases a portion of the suctioned tube portion from the third wall portion towards the end of the container must be removed. In addition, a portion of the container is formed as a cutout between the second wall portion and the third wall portion for the purpose of simplifying the window cleaning and at the same time preventing dust from accumulating on the window.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a longitudinal cross-sectional view of the glass tube part 1, in which a metal core rod 2 is arranged. As the longitudinal cross-sectional view of the metal core rod 1, each wall portion is formed to be stepped three times in the direction of the one end portion 3 of the glass tube portion 1 from the shaft, so that the shoulders 4, 5 and (6) is formed. The mandrel 2 may be made of a single body or may be made of two or more parts joined together. After heating and softening the glass tube part 1, it suctions with respect to the core rod 2 as shown in FIG. Then, when this is cooled, the core rod 2 contracts larger than the glass tube portion 19 being sucked, and can be taken out of the glass tube portion (container) 19 which is sucked as shown in FIG. The inner wall portions 7, 8, and 9 of the organic tube portion (container) 19 sucked by this become very flat and are formed in the correct transverse plane with respect to the axis 11 thereof. The end 3 of the vessel 19 is then cut along the line 10. That is, when cut out by rotation, the wall portion 7 (which is defined as the second wall portion) becomes a mating surface for the window 12 having the light conductive layer 13 as shown in FIG. When supported using the wall portions 7 and 8 in this manner, the grid electrode 14 is exactly parallel to the photoconductive layer 13. However, see the edges 31 or 32 (Figs. 4b and 4c) which cut the container 19 along the line 30 or 30a (Fig. 3) to position the window around the wall 7 (Fig. 3). ) May be left.

5 shows a glass tube portion 19 which is formed by a third wall portion 16 which is produced by extending transversely with respect to the tube axis by suction to the mandrel. Cutting the end 3 of this container 9 with a rotary blade or the like along the line 18 produces a container as shown in FIG. The third wall portion 16 and the inner wall portion 17 of the container are corrected with respect to the wall portions 7 and 8 and the tube axis and used as reference planes.

7 is a longitudinal sectional view of the television imaging tube according to the present invention. This is to install the electron gun 20 in the glass container 19 produced by the suction to the symbol according to the method of the present invention. Nickel wall electrodes (not shown) are installed on the inner wall of the glass container 19 as is well known. As shown in FIG. 4, the glass vessel 19 is fixed with a window 12 having the photoconductive layer 13 and a ring 15 to which the grid electrode 14 is fixed. The imaging tube is formed with a diaphragm 21 supported by the suction reference plane. This imaging tube has a connecting pin 22.

FIG. 8 is a second embodiment of the imaging tube according to the present invention, which is a longitudinal cross-sectional view of the imaging tube, and the structure thereof is the same as that of FIG. Thus, the sign of FIG. 8 coincides with the sign of FIG.

In FIG. 8, it is very difficult to clean the window because of the edges 23 protruding onto the window 12. Thus, in the embodiment shown in FIG. 9, two cutouts 24 and 25 are formed in the protrusion 23. As shown in FIG. The reference planes 16 and 17 are used for the purpose of locating the imaging tubes in this apparatus in place and the window 12 in each imaging tube in place.

Obviously, the present invention is not limited to the circular cross section of the imaging tube. For example, the cross section may also be used as a square image tube such as a square. It is also possible by the method of the invention to make a compact color television receiver tube in which the color selection electrode and the fluorescent screen inside the window are precisely positioned with respect to each other.

Claims (1)

A method of manufacturing a cathode ray tube in which a glass tube is constructed so that one end thereof is sealed with a window and a target is fixed on an inner surface thereof, and an electrode is installed in front of the glass tube. Softened by the suction of the mandrel, the diameter of which is increased at least two times as viewed from the end of the pipe, and the first wall and the second wall are formed transversely with respect to the tube axis. A method of manufacturing a cathode ray tube formed of a mating surface for a window and a second wall portion of a mating surface for a window.

Images