JPH0411976B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to a mask-focusing color picture tube;
In particular, it relates to the method of supporting and fixing the mask.

Technical Background and Problems of the Invention Conventional color picture tubes have a shadow mask with a color selection mechanism, and therefore have a problem of poor electron beam utilization.

A mask focusing color picture tube is a method for solving the above problem. A feature of the mask-focusing color picture tube is that while the shadow mask of a conventional color picture tube only has a color selection mechanism, the mask focusing type color picture tube increases the efficiency of electron beam utilization by increasing the mask hole size. Another object of the present invention is to form an electron lens in the mask through-hole to focus the passing beam onto the screen and increase the brightness.

FIG. 1 is a schematic diagram of a conventional color picture tube, which has an electron gun 1 that generates three beams, a shadow mask 2, and a screen 3 made of phosphors of three colors.

FIG. 2 is a schematic configuration diagram showing an example of a mask focusing type color picture tube, in which an electron gun 4 that generates three beams and a mask electrode on the electron gun side (hereinafter referred to as Mg) are shown.
5. Screen side mask electrode (hereinafter referred to as Ms)
6, and a screen 7 made of phosphors of three colors, Mg, Ms, and Emg,
Ems and Es are applied, and in order to form an electron lens in the through hole, Es=Emg>Ems.

FIG. 3 is an enlarged view showing the vicinity of the screen in FIG. 1, and the three beams 10, 11 and 12 passing through the through hole 9 of the shadow mask 8 are approximately the same size as the through hole, and have three corresponding colors. The light collides with the fluorescent bodies 13, 14 and 15 of. 16 is an envelope panel section.

FIG. 4 is an enlarged view showing the vicinity of the screen in FIG. It is set up.
The beams passing through the through-holes 17 and 18 are focused by the aforementioned electron lens and impinge on the corresponding phosphors 22, 23 and 24, respectively.

Here, since the shadow mask of a conventional color picture tube requires the same voltage as the screen voltage, the method of supporting and fixing it is easy. However, in the case of a mask focusing type color picture tube, a mask electrode that applies a voltage different from the screen voltage is required, so a mask electrode support and fixing technology that takes into account electrical insulation between the mask electrode and other structures is required. becomes.

FIGS. 5 and 6 show general mask support and fixing structures of a conventional color picture tube and a mask focusing type color picture tube.

In the case of the conventional color picture tube shown in Fig. 5, all structures near the mask have the same potential, so the mask 25
The skirt portion 26 of the mask is attached to the frame 27 for fixing the mask.
The mask 25 is supported and fixed by electric welding. The frame 27 is attached to the panel 28 via bimetal or the like.

In the case of the mask focusing type color picture tube shown in FIG. 6, the frame 30 and Mg3 attached to the panel 29
1 have the same potential, so they can be fixed by electric welding as in the conventional case. However, since it is necessary to apply different voltages to Ms32, it must be fixed via an insulator 33. In this case, since the Mg effective surface 34 and the Ms effective surface 35 are preliminarily spaced apart from each other by a certain distance, it is best to fix them using the skirt portion 36.

Fig. 6 If the shape is as it is, the Mg skirt outer surface 3
7, the adhesion of the insulator Mg side surface 38, and the insulator
It is necessary to adhere the Ms side surface 39 and the Ms skirt inner surface 40, and the reliability is halved because the adhesive points are doubled.

Technically, since it is adhesive bonding between surfaces, the characteristics of the adhesive and the bonding method are major issues. To give a specific example, when an adhesive is applied before pressing to form a curved surface of a shadow mask, the characteristics of the adhesive are that it does not adhere to the press mold and is heated after pressing. It must be of such a type that it can restore its adhesion ability. Furthermore, if the thickness of the adhesive changes during bonding after pressing, this is undesirable as it may cause misalignment of the holes between the masks.

OBJECTS OF THE INVENTION The present invention has been made in view of the above points, and an object of the present invention is to support and fix the mask of a mask focusing type color picture tube with high precision.

Summary of the Invention In the mask-focusing color picture tube of the present invention, the skirt portion of one of the two mask electrodes is welded to a mask support frame, and a part of the mask support frame is further fixed to the mask support frame. The mask electrode and the insulator are mechanically supported and fixed by deforming the notch formed by cutting and raising the mask electrode from the other mask electrode side to the mask support frame side via the insulator.

Examples of the invention Examples of the invention will be described below. still,
The mask focusing type color picture tube of the present invention is the same as that shown in FIG. 2 except for the mask support structure, so the explanation of the overall structure will be omitted here and will not be repeated. 7th
The figure is an enlarged schematic diagram of the main part showing an embodiment of the present invention.
FIG. 8 shows the state before the notch 45 provided in the frame 44 is deformed, and FIG.
5 is a schematic diagram showing a state in which the skirt portion and the insulator 43 are narrowed by deforming the structure of FIG. Mg41 and Ms
The arrangement of the mask electrodes 42 is the same as the conventional one, and the skirt portion of one of the two mask electrodes Mg41 and Ms42 is fixed to the frame 44 by welding with an insulator 43 in between. The insulator 43 is formed long so as to be sandwiched between the notch 45 and Ms42 in order to insulate the frame 44 and a notch 45 formed by cutting and raising a part of the frame 44 from Ms42. From this state, the mask is fixed as shown in FIG. 8 by deforming the notch 45 in the direction of the arrow 46 through the insulator 43.

Effects of the Invention As described above, according to the present invention, the skirt portion of one of the two mask electrodes that are relatively fixed through an insulator is welded and fixed to the mask support frame, and the mask It has a structure that mechanically supports and fixes the mask skirt part and the insulator without using adhesives by deforming a part of the support frame, so it is easy to use without having to worry about various problems caused by adhesives. It is possible to provide a mask focusing type color picture tube having a highly accurate mask insulating support and fixing structure through a process.

[Brief explanation of drawings]

Fig. 1 is a schematic diagram showing a conventional color picture tube, Fig. 2 is a schematic diagram of an embodiment showing a mask focusing type color picture tube, Fig. 3 is an enlarged view showing the vicinity of the screen in Fig. 1, and Fig. 4. is an enlarged view showing the vicinity of the screen in Fig. 2, Fig. 5 is a schematic enlarged view showing a general mask support and fixation structure of a conventional color picture tube, and Fig. 6 is a mask support and fixation structure of a mask focusing color picture tube. FIGS. 7 and 8 are schematic enlarged views of main parts showing embodiments of the present invention. 1, 4... Electron gun, 2, 8, 25... Shadow mask, 3, 7... Screen, 5, 31, 41... Electron gun side mask electrode: Mg, 6, 32, 42... Screen side mask electrode: Ms, 9, 17, 18... Mask beam through hole, 10 - 12, 19 - 21... Electron beam, 13 - 15, 22 - 24... Fluorescent material, 16,
28, 29... Panel, 26... Shadow mask skirt portion, 27, 30, 44... Frame, 33, 4
3...Insulator between Mg-Ms, 34...Mg effective surface, 3
5...Ms effective surface, 36...Ms skirt part, 37...
Mg skirt outer surface, 38... Insulator Mg side surface, 3
9...Insulator Ms side surface, 40...Ms skirt inner surface,
45...Frame cutout part.

Claims (1)

[Claims] 1 At least one of the mask electrodes has a screen consisting of two mask electrodes and three color phosphors fixed relatively to each other through an electron gun and an insulator.
In a mask focusing type color picture tube in which a voltage different from the voltage applied to the screen is applied to the screen, the skirt portion of one of the two mask electrodes is connected to the mask support frame through an insulator. The mask electrode is mechanically fixed to the mask electrode by welding and fixing the cutout formed by cutting and raising a part of the mask support frame from the other mask electrode side to the mask support frame side through an insulator. A mask focusing type color picture tube characterized by being supported and fixed.