JPS58201232A - Color cathode-ray tube - Google Patents

Abstract

PURPOSE:To maintain correct landing with good accuracy by providing a screen mask screening needless electron beams on the side nearer to an electron gun than to a shadow mask while working for heightening accuracy of the shadow mask and reducing a change of temperature. CONSTITUTION:Inside of a panel 1 composing a part of a casing of a color cathode-ray tube, a phosphor screen 2 is formed by covering while said phosphor screen 2 is formed of a tricolor phosphor layer 7 and a black coating vernish layer 8 covering the inside of its remaining face plate 1. Further, on the side of an electron gun built in a neck (not illustrated) of said phosphor screen, a color sorting electrode 8 is provided while said color sorting electrode 8 is prepared with an electron beam through hole part 9, which makes an electron beam 19 to correctly hit the phosphor layer 7. On the side to the elctron gun of a shadow mask 3, a screen mask 4 having the through hole part 10 is provided almost closely adhering to said shadow mask. The screen mask 4 is so provided to have electron beam transmittivity phi2 and plate thickness t2 to the side of the electron gun of the color assorting electrode having electron transmittivity phi1 and plate thickness t1 almost closely adhering thereto as well as to satisfy the relation of the formula.

Description

[Detailed description of the invention] [Technology of the invention minute hand] Non-invention is a shadow! Sukuya 7 no (-Chagril-shaped head)
Color selection electrode internal power 2--billion? N area 2 person in charge, thing-
It is possible to prevent the temperature range from rising due to the impact of the electron beam on the color selection electrode and the change in the color selection field due to this temperature rise, thereby maintaining a proper funding state. It's a knee-jerk thing.

[Technical background of the invention and its merits]

In color cathode tubes, inside the neck ≦ two iron eyebrows.
The three electron beams from the electron gun formed a dot-shaped red light inward from the panel.

Fluorescent 1ll composed of phosphor m rim, T is also made of color
1, a predetermined phosphor layer sensitivity Jl#I: In order to irradiate and develop color correctly, the color selection electrode is spaced apart from the fluorophore by a predetermined distance of 11i% (referred to as the value that passes) and is opposed to it. This is provided. This color selection electrode (hereinafter referred to as a shadow mask as a representative) is provided with a Kameko beam passing hole portion through which the electron beam passes, and a portion for shielding the electron beam (a portion other than the electron beam passing hole portion). Therefore, the shape of the tin plate is required to be 1 degree to 62 U in order to ensure accurate 2nd bending of the electron beam. For this purpose, a t'1iiF-through, non-ferrous metal plate is used as a shadow mask, and an electron beam passage hole is cut out with the green plate of this mahjong board-two-photo etching process. It is hard to imagine that the metal plates in some parts of the electronic heel construction hole plate will become worse.
No need to do it. However, on the other hand, unnecessary beams of the electron beam are absorbed in the part of this shadow mask where the electron beam reaches, and for this reason, the shadow mask generates heat, causes thermal deformation, and becomes normal. There is an inconvenience of deviating from the landing state, and this agglomeration becomes larger as the thickness of the shadow mask increases. For example, in the case of a plaque matrix tube with round holes at a pitch of 0.3 m or less, s tt19:'10% is absorbed by the shadow mask and converted into heat energy. To solve this problem, a general C2 #i% turtle IC shadow mask is fixed to a panel bin via a bimetal, and the deformed movement of the shadow mask is corrected by the action of this bimetal. In the first configuration above, the thermal change M(
Since this has the opposite effect on the doming phenomenon (doming phenomenon), a structure in which the plate of the shadow mask is removed may be considered, but this would speed up the precision of the electron beam passage hole. In order to radiate heat from the shadow mask onto the island 3 toward the panel and make the thermal effect red a Arashiyoshi≦2, a metal back cover of the extravagant metal back 2 was also designed to form a black member. There is. However, none of these means is a fundamental solution to maintaining accurate 2nding, and cannot be a definitive solution for preventing landing defects and coffin straightness defects.

In addition, as a special measure, there are hand plates that use materials with less heat** (such as umber) instead of annealed copper with less carbon, which is generally used for shadow mask materials. Due to the principal being passed through the low thermal expansion material, the four electron beam passage holes with good precision are spaced apart, and the springback is large, so the molding N degree of the two large shadow masks in the 5% range is I miss you so much. As another means, as shown in %Gumi No. 109998-52, a shadow mask is provided in the darkness between the fluorescent surface and the electron gun to reduce the transmitted sound of the electron beam. A shielding mask is provided between the shadow mask and the electron gun, which shields the master part of the shadow mask and a part of the irradiated electron beam. In order to increase the amount of electron beam radiation caused by the mask at the periphery of the shadow master than at the center, a structure has been developed in which the distance between the m-shield mask and the shadow mask is made smaller at the periphery. However, in the structure of Jin, the distance between the shadow mask and the J Yabu mask is different between the center and the periphery, so the curvature of the v4 region is different.
Two molds are required to press-form these, and the manufacturing time is doubled, resulting in an increase in the cost of the color cathode ray tube. Moreover, there is a problem in that it requires a large scale of equipment to deposit the mask in a well-balanced manner in the glass pulp while maintaining the shadow mask and the shielding mask, both of which have nested curvatures.

[Purpose of the invention]

The present study is based on the above-mentioned conventional problem, and is aimed at reducing the absorption of electron beams in the shadow mask 2 to reduce the heat generation of the shadow mask itself. In the past, it was important to maintain accurate landing with good sliding performance, and to improve the accuracy of the shadow mask and to reduce direct ME changes, it was important to maintain accurate landing with good sliding performance. [Summary of the Invention] That is, the present invention aims to provide a color cathode ray tube that is easy to manufacture. mwrt,s a part of the electron beam from the electronic beast that is provided on the color selection electrode provided on the 11 color selection poles and the color selection electrode provided on the electronic track inside the neck. At the color cathode edge v provided with a continuous mask, the electron beam transmittance of the color-differentiated electrode is set to Φ1. Thick TL and Schiff.

The electron beam transmittance of the interlocking mask is ψ3. This is a collar-filled carp tube characterized by having a plate thickness of t3 poles and a Kagami-yabu mask placed over the entire surface so as to be in close contact with each other.

[Examples of the invention]

Next, the operation time of the color cathode ray tube of the present invention will be explained with reference to FIG. 1 and [2].

In other words, color gap pole Iw! A fluorescent surface (2) is deposited on the inner surface C21 of the panel (1), which constitutes a part of the outer wall of the tube. Wax color paint M (
81. Also, this firefly, light surface (2)
The inside of the neck 62 is equipped with a color-selecting electrode (81), and this color-selecting type &! TSL has a phosphor layer of the color of the PR leg ( 7) is provided with an electron beam passage hole portion (9) that serves as a side wing.

This shadow mask (81 electron gun @ Ku 2) is provided with this 7 Yadow mask (816=) j#1 Yabu mask (4) which has a circumferential hole S ring that is in close contact and satisfies the relationship described later. The m-shielding mask (4) is designed to form a spherical surface of 1lxIh'' with the shadow mask (8), and the electron beam (
A part (131) of the shadow mask (electron beam 81) hits the phosphor layer (7) C second hole part (9) facing the shadow mask (electron beam 81), and the other part is a shadow mask. The electron beam passage hole (9) of the mask (set 2) is designed to protrude from the chest area.

Next-2 These relationships are as follows: electron beam transmittance (Φ1) of shadow mask + plate thickness (tx), temperature (TI), electron beam transmittance (Φs) of Zhongchang mask (4), plate thickness (ts)
) and Takahiro (Tl), where s (Tll) is the temperature of the shadow mask when there is no transfer mask, and (4) is the proportionality constant.

In this case, Shadow Mask (8) and Renyabu Mask (4) are the same doming police, and 12 is the gong drum (Tl) of Shadow Mask (8) and the warm ML (Shielding Mask God) of Since there is no abnormal fluctuation in Ts), (υ, from equation (2), it becomes.

Here, the shadow mask of the present invention (part T1 of 81 (=
In order to make Tm) 4y lower than the temperature f(Ts) of only the shadow mask without the inferior mask (4), 42 is hTs≧Tl.
Since the relationship (=Ts) is necessary, the relationship cannot be satisfied.

From this fifth equation, if the shadow mask (secondary electron beam transmittance (Φl) is 02 and plate thickness (11) is 0.15 m.

The electron beam transmittance (ΦS) of the solar mask (4) is ΦWeal≦
It becomes 06.

Thickness (tS) of #fim shielding mask (4) with 0.6
is 0.15 m from the fourth equation, and when 0 m = 0.5, tit tg 0.25, and when MΦ = 0.4, t$ = 0.45.

Therefore, if the electron beam transmittance (Φl) of the shadow mask is set to 0.2 and the thickness of the shadow mask is set to 0.15 mm due to the actual characteristics of the force 9-11 [km], the temperature of the shadow mask (set of F1 shift i-sk (4) is ΦB = 0.6.J
-0,15+w.

ΦB −0,5, tl = 0.25 m or ΦB
= 0.4. t@=0.45 kaku.

Experiments have shown that by satisfying this undesirable ride modulus, doming '1i creates a shadow mask (81, ii shadow mask (
4) and no thermal distortion imbalance occurred. Furthermore, due to the mislanding of the shadow mask (8), it is possible to obtain a color-ray tube with extremely good characteristics, which satisfies C without the i*ma mask (4). It is desirable that this relationship be established between the parts 52 of the shadow mask (81) and the shielding mask.

The frame is for holding the shadow mask (8) and the shielding mask (4), and (6) is the frame for holding the shadow mask (8) and the shielding mask (4).
It is a ingredient. And for this installation, you may use a bimetal type and perform heat correction similar to that of the Kenmai. Doing this - Electron beam from two - Shushadoku Mask (J
Since most of the electron beam passing aperture of ll (excluding those passing through Ql) are hit by the shielding mask (4), the temperature rise of the shadow mask (group) is significantly reduced. Therefore, 1g1lI Ik shadow mask.

A good landing can be maintained even when viewing a very thick shadow mask. Furthermore, since the present embodiment has a spherical shadow mask (al and dispersion mask (4) and 10"), only one molding member is required, so the cost is low and maintenance is easy. Shadow mask to the east (8)
The shadow mask (4) can be molded at the time of iWJ, and the manufacturing time is not much different from the conventional one.In addition, the shadow mask (8) and the shield mask (4) can be molded using the conventional frame-mounting set J. Yes, there is only one new required part/fi, a mask (4), and it can be manufactured cheaply for 111 hl and 2 m. This layered mask (4) is a shadow mask (
Since the main function is to collect unnecessary electron beams from a+, it is not necessary to use the top 1LFi of the through hole, and it is easy to abuse it. However, in order to withstand the impact of the electron beam, it is necessary to use a material that has high thermal conductivity, that is, a material that is thicker than the thickness of the shadow mask.

In addition, since the shadow mask (81) and the shielding mask (4) are placed opposite each other, from a microscopic point of view, there is a slight correlation between introspection and reflection, and the thermal energy of the shielding mask is transferred to the shadow mask. ≦The amount that affects the parable of two images is very small.

In addition to the one using the circular dot-shaped phosphor layer of the above embodiment, there are also color cathode ray tubes that combine a band-shaped phosphor layer and seven pertier grilles, and a band-shaped phosphor layer and a rectangular electron beam passage hole. It goes without saying that the shadow mask type color pJ and polar line w-2, which have a similar structure, can also be applied as is.

〔Effect of the invention〕

I [As mentioned above, in the color cathode ray tube of this @mei, the electron beam transmittance (Φ3) and plate thickness (t
M) The mask for the electron beam must be made to satisfy the dense layer 1 relationship for the electron beam transmission (Ql) plate thickness (11). There is no doming caused by the uniform impact of the electron beam on the phosphor layer, and therefore it is possible to accurately impact the electron beam on the phosphor layer, so its industrial value is extremely large. be.

[Brief explanation of the drawing]

1 and 2 are diagrams showing an embodiment of the color-enhancing device of the present invention; FIG. ! Figure 2 is a partially enlarged explanatory sectional view of Figure 1. l... Panel 2... Light surface 3... Shadow mask 4... Shielding mask 5... 7 frames
7... Fluorescent layer 8... Black paint layer 9...
Electron beam through hole lO...through hole 13,
131...Kiko Beam Agent Patent Attorney Inoue - Male

Claims (2)

[Claims] (1) The panel has a fluorescent surface formed in the same layer, a color selection electrode provided facing the -1 fluorescent light direction, and a front! A shielding mask is provided to trace the direction of the electron beam from the electronic beam that hits the color sorting element 1, and is equipped with an ID color-tracing electrode and a neck sensor. The transmittance of the electron beam of the front one color selection electrode is set to Φ1. ′ & rhinoceros is tl, and the transmittance of the electron beam of the Kaneyabu mask is ψ and the plate thickness is ts. 〈1.2, and tl
Φm-Φl The front color-selecting electrode and the shielding mask cover the color-selecting electrode i
In order not to damage the L&circuit of the electron beam, the % value of the color is to be placed so that it is in close contact with the entire THLT-. (2) A special feature W characterized in that the amount of electron beam passing through the color selection electrode is reduced in the central and peripheral areas, or from the central area to the central area.
+Color Chengeki Tube 0 as described in the first spear of Feng Qiu