JP3480137B2 - Color sorting equipment for cathode ray tubes - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of an aperture grill plate used in a cathode ray tube color selection device, and more particularly, to uniformizing the width of the outermost slit among a plurality of vertical stripe slits formed in the aperture grill plate. The present invention relates to a color selecting device for a cathode ray tube.

[0002]

2. Description of the Related Art A color cathode ray tube (hereinafter, referred to as CRT) having one gun, three beams, a striped phosphor screen and an aperture grill plate (hereinafter, referred to as AG plate) has been well known. The AG plate used for such a color CRT is a thin mild steel plate chemically formed with vertical stripe slits by an etching method, and is fixed to a frame made of a steel frame by welding with a predetermined tension. Is.

Such a color CRT frame and AG
A perspective view of the plate is shown in FIGS. 6 and 7. As shown in FIG. 6, the frame 1 is made by pressing upper and lower supporting members 2A and 2B made of steel or the like having an L-shaped cross section (hereinafter referred to as upper and lower members) by a pressing method or a die drawing method. Further, the elastic imparting portions (hereinafter referred to as left and right members) 3L and 3R are formed by bending a square member of steel into a U-shape.
The frame 1 is constructed by welding the ends that are bent inward so that both ends of the bend are further orthogonal to each other and welded to the back sides of the upper and lower members 2A and 2B.

The AG plate 4 is a rectangular thin mild steel plate having vertical stripe stripes 5 formed by a photochemical etching method as shown in FIG. 7, and has a thickness of about 0.1 mm.
Is 300 to 1200, and the pitch is 0.5 to 0.
The electrode element body 7 is selected between the slits 5 and selected to be about 8 mm.
Is made.

When the AG plate 4 is welded to the frame 9 as shown in FIG. 7, the surfaces of the upper and lower members 2A and 2B are finished and the welding is performed at the welded portion 6 of the AG plate 4.
In FIG. 7, welding is performed in a state in which tension is applied in the vertical direction indicated by the arrow AA in FIG. 7, and further, compression is applied in the vertical direction indicated by the arrow BB in the frame 1 as shown in FIG.

The AG plate 4 which has been welded to the frame 1 is cut off leaving the slit 5 and the electrode element body 7, and the spring holder 8 is welded to the upper and lower and left and right members 2B, 3L and 3R as shown in FIG. . A leaf spring 9 having an engagement hole that engages with a pin provided on the side surface of the face panel is welded to the spring holder 8 to form a color selection electrode 10.

[0007] turnbuckle give the frame 1 in the assembly process of the color selection electrode 10 described above (Turn b uckl
e) The force causes variations in the widths of the slits 5 at both ends of the AG plate 4.

That is, when the width of the slit 5 at the end of the AG plate 4 is narrow, the fluorescent stripes formed when the R, G, B fluorescent stripes are exposed on the inner surface of the face plate using the AG plate 4 as a mask. If the width of the slit 5 is wide, on the contrary, an unnecessary portion is exposed and unnecessary exposure is caused. In order to solve such problems, AG board 4
The applicant of the present invention has disclosed a color selection electrode having a structure in which the slit width is evenly extended to the end portion of the plate with a predetermined width.
No. 159716 and Japanese Patent Laid-Open No. 6-139950.

The above-mentioned Japanese Unexamined Patent Publication No. 6-139950 discloses that the width of the outermost tape portion adjacent to the outermost side of the outermost slit of the AG plate 4 is at both ends in the extending direction of the outermost slit. The width of the slit at the end is made wider in the central portion than that of the portion to keep the width of the slit at a predetermined width.

Further, as disclosed in JP-A-5-15716, as shown in FIG. 9, the end tape width adjacent to the slits 5a at the left and right ends of the plurality of slits 5 formed in the AG plate 4 is shown. endmost slits 5a in section 12 or these distances X =
P to 2P (where P is the pitch between the slits) and the distance Y
= 0 to 2P is formed by forming a slit 11 which is 40 to 70% thinner than the width of the slit 5, and the slit 11 is formed when the AG plate 4 is used as a mask during the phosphor stripe exposure. The AG plate 4 is made thin enough so that the stripes of the phosphor are not formed by
The slits 11 are configured to relieve a non-uniform turnbuckle force during the stretching of the above and prevent the endmost slits 5a from changing.

[0011]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
The slits 11 and the like provided on the G plate 4 have the outermost slits 5a narrowed when they are stretched on the frame 1,
This is provided for the purpose of preventing the deterioration of the image quality at the edge of the face panel due to the insufficient light amount during the exposure of the phosphor stripe using the plate 4 as a mask. However, there is also a color selection electrode in which tension is applied to the AG plate 4 in the direction in which the width of the outermost slit 5a is widened, and such a color selection electrode exposes an unnecessary portion when the phosphor stripe is exposed,
There is a problem that it is not applicable to all color selection electrodes only by providing the slit 11 for absorbing change on the outer side of the outermost slit.

Further, in the technique of processing the slit 11 provided adjacent to the extreme end slit 5a of the AG plate 4 to have an extremely small width, the sensitivity (degree) in which various characteristics depend on the width and shape of the portion is very high. Highest, slit 5 at the end of AG plate 4 during processing
There has been the complexity of strictly controlling the shape of a.

The present invention is intended to provide a CRT color selecting device which solves the above problems, and its problem is AG.
The purpose is to obtain a color selection electrode that can be adjusted when the end slit is narrowed or widened when the plate 4 is stretched.

[0014]

In order to solve the above problems, a first aspect of the present invention relates to a color selecting apparatus for a cathode ray tube having a color selecting electrode in which an aperture grill plate is stretched over a frame. The slit width at the end of the vertical stripe-shaped slit provided in is configured to be adjustable to a predetermined width by selecting the length in the slit direction of the rectangular protrusions provided at the four corners of the aperture grill plate, How to slit the protrusion
The length in the direction is slit from the long edge of the aperture grill plate.
The cathode ray tube color selecting device is characterized in that it is made longer than the length to the end . The second of the present invention frame
A color selection electrode with an aperture grill plate mounted on the
Aperture grille in a cathode ray tube color selector
The slit width at the end of the vertical striped slits provided on the plate
Square protrusions on the four corners of the perch grill plate
It is possible to adjust the length to the specified width by selecting the length in the
The length of the protrusion in the slit direction is the aperture.
Compared to the length from the long side end of the grill plate to the slit end
A cathode ray tube color selection device characterized by being shortened
It is a thing.

According to this structure, it is only necessary to provide rectangular projections at the four corners of the AG plate 4 rather than forming thin slits when the end slit provided on the AG plate is applied with tension in the direction of narrowing or expanding. A CRT color sorter that can be easily adjusted is obtained.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The CRT color selecting apparatus of the present invention will be described in detail below with reference to FIGS. Incidentally, conventionally, the same reference numerals are given to the portions corresponding to the configuration.

FIG. 1 is an overall perspective view of the color selection electrode of the CRT of this example. In the color selection electrode 10 having the structure shown in FIG. 1, unlike the structure shown in FIGS. 6 to 8, the frame 1 is welded with substantially U-shaped left and right members 3L and 3R at the outermost peripheral ends of the upper and lower members 2A and 2B. The AG plate 4 has a different structure.
The long sides of are aligned with the lengths of the upper and lower members 2A and 2B of the frame 1 and are cut into a rectangular shape to perform welding.

A plurality of slits 5 are formed on the AG plate 4, and a plurality of electrode bodies 7 are bridged between the upper and lower members 2A and 2B at a predetermined pitch. Rectangular protrusions 13 are provided at the four corners of the AG plate 4 in the upper, lower, left, and right directions, and cutout recesses 15 are formed in the outermost tape width portion 12.

The color selection electrode shown in FIG. 1 has a U-shaped left and right member 3 on both end faces between the upper and lower members 2A and 2B constituting the frame 1.
The structure is made by welding L and 3R.
The plate 4 may be welded to the frame 1 as shown in FIG.

A side view of such a color selection electrode having a different frame structure and a state of stress distribution thereof will be described with reference to FIGS.

In FIG. 2, the left and right members 3L and 3R are welded to the frame 1 described in FIG. 6 at positions facing both ends of the upper and lower members 2A and 2B toward the center. In FIG. 3, the left and right members 3L and 3R are the upper and lower members 2A. And 2B are welded to both ends.

In the above-mentioned two types of color selection electrodes, the stress distribution has upper and lower members 2A and 2B as indicated by curves 16 and 17, respectively.
On the other hand, it is known that the tension at the point 18 where the left and right members 3L and 3R are welded becomes the largest.

As described above, it was found that the stress concentration portion of the outermost tape width portion 12 significantly changes based on the difference in tension distribution applied to the AG plate 4. These will be described with reference to FIG. 9 as a comparative example with reference to FIG. 4, which is an enlarged view of a portion A of FIG.

The structure disclosed in the conventional configuration of FIG. 9 has a protrusion 13, but the length d ₁ of the protrusion 5 in the extending direction of the slit 5 is determined by the slit 5 from the upper or lower edge of the AG plate 4.
5a has the same dimension as the length d ₂ to the open end 5e, and d
₁ = d ₂ is selected.

On the other hand, in the AG plate 4 of the color selection electrode 10 of FIG. 4 showing one embodiment of this embodiment, the slit 5 is formed from the upper or lower edge of the AG plate 4 in comparison with the length d ₁ of the protruding portion. Open end 5
Select the length d ₂ up to e such that d ₁ > d ₂ .

That is, stress concentration when a tension is applied to the AG plate 4 as shown in FIG. 4 occurs at the root 19 portion which is the opening end 5e of the slit 5a. This stress concentration is due to the protrusion 13
Shows that the longer the length d ₁ is compared with the length d ₂ , the more remarkable it becomes, and the width of the outermost slit 5a tends to widen in a proportional manner.

The tension characteristic of such an AG plate 4 is shown in FIG.
It is effective when used for the color selection electrode 10 whose end portion is stretched with a higher tension than that of the central portion of the AG plate 4, as shown in FIG.

That is, in the color selection electrode having the stress distribution as shown in FIG. 3, the end slit 5a of the AG plate 4 has a higher tension in the welded portions of the left and right members 3L and 3R than in the central portion of the AG plate 4. Since the outermost slits 5a tend to be sandwiched due to being stretched, they have characteristics opposite to those of the AG plate 4 having the configuration shown in FIG. _If the relationship between ₁ and d ₂ is d ₁ > d ₂ and the length of d ₁ is adjusted, the slit width of the stress concentrating portion 19 of the outermost slit 5a can be secured at a predetermined width.

On the other hand, A of the color selection electrode 10 as shown in FIG.
In the G plate 4, the length d ₂ from the upper or lower edge of the AG plate 4 to the opening end 5e of the slit 5 is d compared with the length d ₁ of the protruding portion.
₁ <d ₂ is selected.

That is, when stress is applied to the AG plate 4 as shown in FIG. 5, the stress concentration is 20 at the intersection of the protrusion 13 and the recess 15.
It occurs in parts. Therefore, as shown in FIG.
The tension increases at the position 18 where the left and right members 3L and 3R are welded to A and 2B, but if it is considered that the tension is evenly applied on average, the presence of the protrusions 13 causes a plurality of AG plates 4 The tension of the electrode body 7 is made uniform.

Therefore, the AG plate 4 having a relationship of d ₁ <d ₂
Is used for the color selection electrode 10 having the frame 1 as shown in FIG. 2, it becomes possible to very effectively change the width of the outermost slit.

[0032]

EXAMPLE As a comparative example, a conventional example shown in FIG. 9 and a structure having no protruding portion 13 are shown as examples of the present invention.
The relationship with is described below.

In the color selection electrode 10 shown in FIG. 3, which is stretched with a high tension at the end portion as compared with the center portion of the AG plate 4, from the center portion to the end portion of the AG plate 4 every 1 kg / mm ² per 10 mm Table 1 below shows changes in the shape of the protruding portion of the AG plate 4 and the width of the outermost slit 5a when it is strongly stretched. The length d ₁ of the protruding portion 13 is ₂ mm longer than d _{2 in} the case of d ₁ > d ₂ .

Example 1

[Table 1]

Further, as a conventional example shown in FIG. 9 and a configuration example without the protruding portion 13, the relationship with FIG. 5 of this example will be described below.

With the color selecting electrode 10 shown in FIG. 2 in which the tension of the AG plate 4 is uniformly stretched over the whole, the tension of the electrode body 7 is set to 50 k.
Table 2 below shows changes in the shape of the protruding portion of the AG plate 4 and the width of the outermost slit 5a when g / mm ² is set. The length d ₁ of the protrusion 13 is ₂ mm shorter than d ₂ by d ₁ <d ₂ .

Example 2

[Table 2]

As is clear from Examples 1 and 2 above, it is understood that the amount of change in the extreme slit width of the AG plate 4 after stretching is greatly improved.

[0039]

According to the present invention, the rectangular projections are provided at the four corners of the color selection electrode, and the length d ₁ of the projections in the longitudinal direction is controlled to control the stress applied to the outermost slit. The slit of the color selection electrode can be stretched to the end portion with a predetermined width. That is, even when tension is applied in the direction in which the width of the end slit of the color selection electrode is narrowed,
It is possible to adjust even when tension is applied in the direction in which the width of the outermost slit widens. Further, the process of providing the protruding portions at the four corners of the AG plate is simpler than the conventional process in which the width of the outermost slit is made narrower than usual, and it is easy to qualitatively measure its characteristics. Therefore, it is possible to obtain a color separation device for a cathode ray tube in which the vertical striped slit of the color selection electrode can be controlled to a predetermined width up to the most end portion more easily and qualitatively than in the past.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a cathode ray tube color selection device of the present invention.

FIG. 2 is an explanatory diagram of stress distribution of a color selecting device for a cathode ray tube according to the present invention.

FIG. 3 is another stress distribution explanatory view of the cathode ray tube color selecting device of the present invention.

FIG. 4 is an enlarged view of part A in FIG.

5 is another configuration diagram of an enlarged view of a portion A of FIG. 1. FIG.

FIG. 6 is a configuration diagram of a frame of a conventional color selection device.

FIG. 7 is an assembly configuration diagram of a conventional frame and an aperture grill plate.

FIG. 8 is a configuration diagram of a conventional color selection electrode.

9A and 9B are an enlarged plan view and a side sectional view of a main part of a conventional aperture grill plate.

[Explanation of symbols]

1 frame 4 AG board 5 slits 5a Edge slit 10-color selection electrode 12 Support tape width 13 Projection 15 recess

─────────────────────────────────────────────────── --Continued from the front page (56) References JP-A-2-174042 (JP, A) JP-A-49-122961 (JP, A) JP-A-62-249339 (JP, A) JP-B-49- 45949 (JP, B1) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01J 29/07

Claims (2)

(57) [Claims] 1. A cathode ray tube color selecting device having a color selecting electrode in which a frame is covered with an aperture grill plate, wherein the slit width at the end of the vertical striped slits provided in the aperture grill plate is The rectangular projections provided at the four corners of the aperture grill plate are configured so that the lengths in the slit direction can be adjusted by selecting the lengths in the slit direction, and the lengths of the projections in the slit direction can be adjusted by the aperture grip.
Compared to the length from the long side end of the rule plate to the slit end
Cathode ray tube color selection device characterized by being long . 2. An aperture grill plate is mounted on a frame.
In a cathode ray tube color sorter with a colored electrode
The vertical stripe-shaped slits on the aperture grill plate above.
Provide slit widths at the four corners of the aperture grill plate.
Select the length of the rectangular protrusion in the slit direction.
It is configured so that it can be adjusted to have a constant width, and the length of the protruding part in the slit direction is the aperture gap.
Compared to the length from the long side end of the rule plate to the slit end
A cathode ray tube color selection device characterized by being shortened.