JPS58175235A - Mask focusing type color picture tube - Google Patents

Abstract

PURPOSE:To support and fix the mask support of a mask focusing type color picture tube with high accuracy by fixing together the permeation holes provided on the skirt section of a mask and an insulator respectively through the insulator. CONSTITUTION:In a mask focusing type color picture tube that is provided with at least an electron gun 4, two mask electrodes 5 and 6 fixed relatively through an insulator, and a screen 7 consisting of a tri-color phosphor and in which the voltage that differs from the voltage applied to the said screen 7 is applied to at least either one of said mask electrode 5 or 6, permeation holes 42, 44, and 46 are provided on the skirt section of the said mask electrodes 5 and 6 and the said insulator 43 and at least a part of the permeation hole 44 of the said insulator 43 overlaps with the permeation hole 46 of the said skirt section and then the two sheets of mask electrodes 5 and 6 are fixed relatively by inserting an insulator 47 into the said overlapped permeation holes.

Description

DETAILED DESCRIPTION OF THE INVENTION TECHNICAL FIELD OF THE INVENTION The present invention relates to a mask focal area color picture tube, and more particularly to a method for supporting and fixing the mask.

TECHNICAL BACKGROUND OF THE INVENTION Conventional color picture tubes have a shadow mask with a color selection mechanism, which has the problem of poor electron beam utilization.

A method to solve the above problem is to use a color picture tube with a focusing mask. The length of 411 m for the mask focusing color picture tube is 1.
While the shadow mask of conventional color picture tubes only has a color selection mechanism, the electron beam utilization rate is increased by increasing the size of the mask hole, and an electron lens is installed in the mask hole. It is possible to focus the passing beam onto the screen and increase the brightness by forming it.

Figure 1 is a schematic diagram of a conventional color picture tube, including an electron gun (1) that generates three beams, and a shadow mask (2).
) and a screen (3) made of phosphors of three colors. Figure 2 is a schematic configuration diagram showing an example of a mask focusing type color picture tube, and includes an electron gun that generates three beams. (4), electron gun side mask electrode (hereinafter referred to as Mg) (5).

Screen@mask electrode (hereinafter referred to as Ms) (6), and a screen made of three color phosphors (having power,
Emg, l:ms and El are applied to Mg, Me and the screen to form an electron lens in the hole, so that E@=Brn11)gms.

Figure 3 is an enlarged view showing the vicinity of the screen in Figure 1, showing three beams (
11, (11 and Q hot water have almost the same size as the above-mentioned through hole, and strike the corresponding three color phosphors tri, us and 0!9. αe is the envelope panel part.

Figure 4 is an enlarged view showing the vicinity of the screen in Figure 2;
The through hole aη of g and Ms and the center axis of (II are the three beams d1.
The beam passing through the through hole αη and OI provided along the trajectory of to hit

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 color picture tube,
Since a mask electrode to which a voltage different from the screen voltage is applied is required, a technique for supporting and fixing the mask electrode is required in consideration of electrical insulation between the mask electrode and other structures.

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 Figure 5, all structures near the mask have the same potential, so the skirt part (to) of the mask (c) is electrically welded to the mask fixing frame (b). Supporting and fixing the sho mask (to). The frame (5) is attached to the panel lJ4 via bimetal or the like.

In the case of the mask focusing type color picture tube shown in FIG. 6, the round frame (to) is attached to the panel (to) and the Mg (31) are at 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 Ms (32), it must be fixed via an insulator (33). In this case, since the effective surface of Mg (34) and the effective surface of Ms (35) are already spaced a certain distance by 1, it is best to fix them with the skirt part (36). In the shape of , adhesion between the Mg skirt outer surface (37) and the Mg side surface (38) of the insulator, and Ms@ of the insulator
(2) It is necessary to adhere the m (39) and the inner surface of the Ms skirt (40), and since the adhesive points are doubled, the reconnaissance performance is halved.

Technically, since surfaces are bonded together, the characteristics of the adhesive and the bonding method are major issues. To give a specific example, if 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. 7. It must be such that the adhesive ability can be restored by the following methods. Furthermore, the thickness of the adhesive may change during adhesion after pressing.
−] is undesirable because it causes hole misalignment between masks.

purpose of invention The present invention was made in response to the above points.

The purpose is to support and fix the mask of a picture tube with high precision.

Summary of the Invention The mask focusing type color picture tube of the present invention has a through hole in the skirt portion of the mask electrode and an insulator, at least a portion of the second through hole overlaps, and an insulator is interposed in the overlapping portion. This is to relatively fix the two mask electrodes.

EXAMPLES OF THE INVENTION Examples of the present invention will be described below. The mask focusing type color picture tube of the present invention has a second structure other than the mask support structure.
Since it is the same as that shown in the figure, the explanation of the overall configuration will be omitted here and will not be repeated. , FIG. 7 is a partially enlarged schematic diagram showing an embodiment of the present invention, in which a through hole (4) provided in Mg (41) is shown.
2), a through hole (44) provided in the insulator (43),
Insulating material (47) is provided in Ms (45) and nine through holes (46).
) to relatively fix the mask electrode. 8th
Figures 1 to 10 are partially enlarged schematic views showing other embodiments of the present invention. Figure 8 is an example in which a through hole is provided only in Ms and the insulator 1, Figure 9 is the same as Figure 7, but it is made of an insulator instead of the insulator, and a nine screw (48) is inserted. It's a friend. Figure 10 shows the case where the size of the through hole is changed.
This is an example. It goes without saying that a combination of the embodiments shown in Figures 7 to 1θ is also possible.

Effects of the Invention As described above, according to the present invention, instead of bonding the skirt portions of two masks mainly on their surfaces, the skirt portion of the mask and the through hole provided in the insulating material are bonded together through the insulating material. Since it has a fixing structure, it is possible to provide a mask focusing type color picture tube having a highly accurate mask insulation support fixing structure regardless of the thickness of the adhesive used for fixing.

[Brief explanation of the drawing]

Fig. 1 is a schematic diagram showing a conventional color picture tube, Fig. 2 is a schematic diagram showing a mask-focusing color picture tube, and Fig. IIa is a schematic diagram showing a conventional color picture tube.
An enlarged view showing the vicinity of the screen shown in Fig. 4.
5 is a schematic enlarged view showing the general mask support and fixing structure of a conventional color picture tube. FIG. 6 is a schematic enlarged view showing the mask support and fixation structure of a mask-focused color picture tube. 7 to 10 are schematic enlarged views of main parts showing embodiments of the present invention. +1>, (4)...Electron gun, (2), +8), (c)
...shadow mask, +3), (force...screen, +5), (31), (41)...electron gun side mask electrode: Mll(6), (32), (45)
...Screen sea bream mask electrode: Ms. (9), Q7), α barrel...mask beam hole, Ql-
μ, (11-Ql...Electron beam, U difference~U Mu, 4~
Shihun...fluorescent body, 4, (to), (2)...panel,
(To)...Shadow mask skirt part, (2),■・
・Vlem, (33), (43)...Mg-Mg insulator, (34)...Mg effective surface, (35)-MJ
Effective surface, (36)-Ms skirt part, (37)...Mg
Skirt outer surface, (38)...Mg side surface of insulator, (39)...Mg side surface of insulator, (40)...M$ Boss skirt surface, (42)...Mg Skirt through hole, (44)... Insulator through hole, (46)... Ms skirt through hole, (47)... Insulating filler for mask fixing, (48).
...Insulating screws. Agent: Attorney Noriyuki Chika (1 person) No. 1
Figure 2 Figure 13 Figure 114 Figure 5 Figure 116 Figure 7 Figure 8 Figure 9 Figure 10

Claims (1)

[Claims] It has at least an electron gun, two mask electrodes fixed relatively to each other via an insulator, and a screen made of phosphors of three colors, and at least one of the mask electrodes is provided with the screen. In a mask focusing type color picture tube to which nine voltages different from the voltage applied to the mask electrode and a voltage different from the voltage applied to the mask electrode are provided, through-holes are provided in the skirt portion of the mask electrode and the insulator,
At least a portion of the through hole in the skirt portion and the through hole in the insulator overlap, and the two mask electrodes are relatively fixed by interposing an insulator in the overlapping through hole. Mask focusing area color picture tube.