JPS63160135A - Color cathode-ray tube - Google Patents

Abstract

PURPOSE:To invariably obtain a good beam landing characteristic by constituting a holder with a coupling section having a hole hooked with the stud pin of a panel and a fixing section fixed to a frame and providing a bent section on part of the panel side between the fixing section and coupling section. CONSTITUTION:The first stainless member 31 serving as the coupling section of a holder 30 is constituted of a support face 31b having a support hole 34 coupled with a stud pin 20 and a slant face 31a continued to it. The second stainless member 32 serving as a sticking section is constituted of a bent section 32a bent in parallel with the slant face 31a of the first stainless member 31, with the panel-side section serving as the coupling section and a fixing section 32b continued to it and parallel with the outside wall face of a frame 11. That is, no machining section exists near the panel side end section of the coupling section of the holder 30;external shocks are absorbed by the slant face of the coupling section; thus the permanent deformation of the holder is mitigated. Accordingly, an invariably good beam landing characteristic is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a shadow mask type color picture tube, and particularly to a shadow mask holding structure.

(Prior Art) When supporting a shadow mask in a color picture tube, there is a method in which a holder is fixed to a diagonal portion of a frame and suspended from stud pins installed in a diagonal portion of an inner wall of a panel.

For example, a patent application filed in 1986-138 filed by the same applicant as the present application.
No. 950 discloses a structure in which a shadow mask is fixed to the four corners of the inner wall of the panel using holders. As shown in FIG. 3, such a holder (10) has a fixing part (10a) fixed to at least the side wall of the frame (11).
) and the stud pin (
20) An engaging portion (10b) that is engaged with the L. If such a holder (10) is used, the shadow mask (12) and frame (
11) expands, the shadow mask (12) moves toward the screen (13), and the displacement between the hole of the shadow mask (12) and the opposing luminescent dot of the screen (13) J2 occurs due to this expansion. Color reproduction errors caused by this are corrected.

(Problems to be Solved by the Invention) In the structure of the holder described above, which is designed based on the correction principle, during the manufacturing process of color picture tubes, there is no need for repeated attachment/detachment operations or mechanical interference from the outside. The force received by a double shot will be explained using Fig. 4. That is, the holder (10) is subjected to a force F due to attachment/detachment work or mechanical impact from the outside, and the holder (10) is bent at 13 points and 0 at the bending portion of the engaging portion (10b).
A force is generated with the point as the fulcrum. However, the zero point can move to some extent spatially, and the engaging portion (iob) bends in an arcuate manner, so that the force applied to the zero point is weakened. However, since point B is in the same state as being fixed, a large force is applied to this bent portion, that is, to one point of the once processed portion. If this applied force is too large, it will cause permanent deformation. In addition, the fixed part (10a) is subjected to force F2 with the welding point A as the fulcrum, and there is also a problem that the force is applied at one point and deformation occurs at that part due to various impacts. .

The present invention has been made in view of the above points, and an object of the present invention is to provide a color picture tube that can reduce permanent deformation of the holder due to attachment/detachment work and external impact, and can always obtain good beam landing characteristics. It is something.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a holder that includes an engaging portion having a hole that engages with a stud pin of a panel, and a fixed portion that is fixed to a frame. This is a color picture tube that has a bent part bent in the tube axis direction on a part of the panel side between the tubes.

(Function) Since there is no processed part near the panel side end of the engaging part of the holder, and external impact is absorbed by the slope of the engaging part, permanent deformation of the holder is reduced.

(Example) Hereinafter, an example of the present invention will be described with reference to the drawings. 1 and 2 show a color picture tube according to the present invention and a part thereof. First, as shown in FIG.
), a funnel-shaped funnel (16) peripherally sealed to this panel (15), and a neck (17) connected to the tapered part of this funnel (16).
)have. A phosphor screen (J3) consisting of a striped pattern of phosphors of each color emitting light in three colors of red, green, and blue is formed on the inner surface of the panel (15), and is arranged opposite to this phosphor screen (13). An electron gun (18) that emits three electron beams that excite the phosphor to emit light is disposed within the neck (17).

Between the phosphor screen (13) and the electron gun (18), there are a number of dust masks (12) close to the screen (13) that selectively distribute three electron beams to the screen (13). The periphery is fixed to a relatively thin iron frame part (11) of 0.4 mm thicker than the thickness of the shadow mask. Screen (13), Shadow Mask (1)
2) The holders (30) are welded and fixed to the outer wall portions of the four corners of the frame portion (11), which are both substantially rectangular and correspond to the diagonal axes of the diagonal portions of the rectangle, as shown in FIG. .

Holder (30) is 0.4mm thick (7) Stainless steel L/
It is made up of two pieces of X (SUS631) material. The first stainless steel member (31) forming the engagement part is composed of a support surface (31b) having a support hole (34) into which the stud pin (2o) is fitted, and a slope (31a) continuous with the support surface (31b). ing. Second stainless steel member (32) forming the fixed part
is a bent part (32a) bent so as to be parallel to the slope (31a) of the first stainless steel member (31) whose part on the panel side forms an engaging part, and a frame (
11) is composed of a fixed part (32b) parallel to the outer wall surface. The frame (
11), and its bent portion (32a) is welded and fixed to one end of the slope (31a) of the first stainless steel member (31).

The second stainless steel member (32) is welded and fixed to the four corner outer walls of the frame (11) at several locations.

FIG. 5 shows the forces that such a holder according to the invention is subjected to due to attachment/detachment operations and external impacts. The holder (30) receives a force F due to attachment/detachment work or external mechanical impact, and this force F3 applies force to point F of the bent portion of the first stainless steel member (31), which is the engaging portion. . However, this force is applied to the slope (31a) of the first stainless steel member.
It is absorbed by the arcuate deflection of the material, and permanent deformation at point F is unlikely to occur. Further, the point G of the engaging portion, which is fixed to the fixed portion and is subjected to a force, simply acts like a spring against the force F3. That is, unlike the conventional holder shown in FIG. 4, the portion to which force is applied is not bent, so that it is difficult to permanently deform under pressure. Furthermore, since the force applied to the second stainless steel member (32), which is the fixed part, is distributed to two locations: the bending point E and the welding point between the frame and the holder, it is difficult to permanently deform. As described above, the holder of the present invention has a significantly improved beam lantern compared to a holder with a conventional structure.

In another embodiment of the present invention, the thickness of the first stainless steel member (31) in FIG. 1 is 0.4 mm, and the thickness of the second stainless steel member (32) is 0.5 m.
The stainless steel member (32) is slightly thickened.

In this way, the strength against impact can be improved, and the force required to bend the first stainless steel member during attachment and detachment does not increase much, so the attachment and detachment work does not become difficult.

However, if the second stainless steel member (32) is made too thick, it will be difficult to attach and detach it. Experimentally, if the thickness of the second stainless steel member (32) is in the range of 1 to 2 times the thickness of the first stainless steel member (31), there will be less permanent deformation during attachment and detachment and due to external impact, making it easier to attach and detach. I found that the work was easy. Within this range, sufficient mechanical strength can be maintained without causing permanent deformation.

The above explanation was about the method of supporting at the corner.
It goes without saying that correction for thermal expansion based on the principle shown in FIG. 4 is also possible in a system in which the frame is supported at the middle part of the side, and that the present invention is also applicable to such a system.

〔Effect of the invention〕

As described above, according to the present invention, the permanent deformation of the holder due to the work of attaching and detaching the shadow mask structure or external impact is small.
A color picture tube that always maintains good beam landing characteristics can be obtained.

The figure is a partial sectional view of a color picture tube for explaining an embodiment of the present invention, FIG. 3 is a partial sectional view of a conventional color picture tube, and FIG. 4 is a force applied to the holder of a conventional color picture tube. FIG. 5 is a sectional view illustrating the effect of force when force is applied to the holder of the present invention.

(10), (30)...Holder (11)・
...Mask frame (13) ...phosphor screen
(15)...Panel (14)...Shadow mask
(16)...Funnel (17)...Neck
(20)...Stud bottle 3I...First stainless steel member 32...Second stainless steel member Representative Patent attorney Noriyuki Chika Yudo Norio Ogo Figure 3 Figure 4

Claims (5)

[Claims] (1) A phosphor screen formed on the inner surface of the panel, an electron gun installed in the neck that emits an electron beam that excites the screen and causes it to emit light, and a large number of through holes located close to the screen. shadow mask and
In a color picture tube comprising a mask frame fixed to the peripheral end surface of the shadow mask, and a plurality of holders for locking the frame to stud pins implanted in the side wall of the panel, the holder is , consisting of at least a fixed part fixed to the side wall part of the frame and an engaging part fixed to the stud pin, and a part of the panel side between the fixed part and the engaged part in the tube axis direction. A color picture tube characterized by having a bent portion. (2) The color picture tube according to claim 1, wherein the bent portion is provided on the panel side of the fixed portion, and a part of the engaging portion is welded and fixed to the bent portion. (3) The color picture tube according to claim 1, wherein the holder is fixed to the outer wall at the four corners of the frame. (4) The color picture tube according to claim 1, wherein the frame has a step on a part of the screen side. (5) The color picture tube according to claim 1, wherein the thickness of the fixing portion of the holder is within a range of 1 to 2 times the thickness of the engaging portion.