JPS58166627A - Color picture tube - Google Patents

Abstract

PURPOSE:To achieve a high quality picture image, by making such that the open hole region of the shadow mask is larger at the electron gun side than the phosphor face side while the width in the direction of horizontal axis at the thick section of the mask in the open hole region is longer than the width in the direction of the horizontal axis at the phosphor face side. CONSTITUTION:The open hole section of the shadow mask is formed of a bridge section having the thickness of board (T) of 0.3mm., the arranging pitch in the direction of X-axis of 0.75mm., in the direction of Y-axis of 0.81mm. and the longitudinal width of the slit open hole viewed from the phosphor face side of 0.12mm. and a bank section having the width (d) between the short directions of the slit open hole viewed from the phosphor face side of 0.25mm. or formed into a slit open hole having sufficient large width G(0.56mm.) when compared with the width D(0.50mm.) of the open hole region 61 at the phosphor face side. While a short side wall is formed into a slit open hole having small width W(0.20mm.) when compared with the width W(0.22mm.) of the open hole region 63 at the electron gun side. The region where the thickness (t) of the etched section 65 at the side of the region 63 is 0.05-0.08mm. is formed at the position departed approximately 0.25-0.30mm. from the central axis 71 of the small diameter hole. Consequently a high quality picture image can be formed.

Description

TECHNICAL FIELD OF THE INVENTION The present invention relates to a color picture tube having a shadow mask having a large number of slit-like apertures in the picture tube.

Technical background of the invention and its problems In general, a cup receiving tube has an outer circumference 11 (1
) is, for example, a panel part (3) having a three-color fluorescent surface (2).
It consists of a funnel-shaped funnel part (5) externally equipped with a deflection coil (4), and a neck part (7) provided with an electron gun 6) for emitting a plurality of electron beams. At a position facing the fluorescent surface (2) of this panel portion (3) and at a predetermined distance of m, a good electron beam is emitted from an electron gun (6) and directed to a predetermined three-color fluorescent surface (2). ) are arranged round shadow masks (8) that are centered on the respective areas. For example, the effective perforated part on the fluorescent RFI side of this shadow mask (8) has a slit-like opening (a large number of holes are arranged, that is, a substantially rectangular slit-like opening) as shown in Fig. Sakahole σQ is regularly arranged in a straight line with nine red, green, and dorsal fluorophore strips in the same vertical direction (hereinafter referred to as the Y-axis direction) via a bridge SA2. They are arranged in a straight line to form a row of slit-like holes, and the rows of slit-like holes are arranged horizontally (hereinafter referred to as the X-axis direction) in a row at a constant pitch PX. In a color receiver tube with a shadow mask, the three electron beams corresponding to red, edge 1, and actually, respectively, are accelerated and focused by the nine deflection coils (shown in Figure 1).
4) The light is deflected by the shadow mask and once converged in the vicinity of the slit-shaped opening of the shadow mask, and then diverges again until it reaches the fluorescent surface, and is arranged regularly and overlappingly on the fluorescent surface, emitting nine red, edge, and blue lights. Correctly focuses the corresponding rays on each phosphor m* to load and output a color image. By the way, the perforated effective portion of the shadow mask has a structure as shown in Figure 3, for example. -FO the slit-shaped opening on the fluorescent image side that is long in the Y-axis direction.
A large number of these strips are arranged at a pitch PY through the bridge I, and the stripes form a strip, and these strips are densely arranged in the X-axis direction at a pitch PX to form a group of nine strips. There is a slit-like hole aυ in the X-axis direction on the fluorescent image side. and,
The width of the slit-shaped fighting hole aSO surface opening region on the electron gun side in the X-axis direction is W. The reason why the slit-like single-hole aSO surface opening areas on the fluorescent surface side and the electron gun side are different in this way is to ensure that the electron beam is deflected in the peripheral direction and the amount of electron beam transmission during travel is ensured.

The cross-sectional shapes of this shadow mask in the X-axis direction and the Y-axis direction are shown in the 411th and SWA, and the 4811th is the sgo
This shows a part of the cross section in the x-axis direction, with a slit-shaped hole -OX
The long side wall (22
) The cross-sectional shape is such that one side (23) of the shadow master, i.e., the fluorescent image side, has a larger opening than the other side (24), i.e., the electron gun side), and the thickest part of the shadow mask has the minimum width in the Ox axis direction. are formed in a tapered shape unevenly distributed on the surface (24) on the electron gun side. On the other hand, part of the cross section in the OY axis direction in Figure 3! 11
As shown in Fig. 15, the Y-direction cross section of the slit-shaped opening (2), that is, the short side 11 (25), is located approximately at the center of the side - side at the minimum in the X-axis direction of the thick part of the shadow mask (hereinafter referred to as Y-axis The openings on both the front and back surfaces of the shadow i-sk have approximately the same size, and the side walls are inclined in the (23) and (24) directions, respectively. There is. That is, the slit-like opening (to) of this shadow mask
In particular, the minimum hole IIg in the Y-axis direction exists in the dark center of the shadow master wall thickness, and one side of the shadow mask (23
) The distance to the minimum diameter portion of the slit-shaped opening is different between the Y-axis direction and the X-axis direction of the slit-shaped opening. (
h1≠h,), a slit-like opening having such a cross section is formed with a negative pattern as shown in FIG. The tap is formed by etching. As shown in FIG. 6, these pair of negatives each have a negative pattern having a length of 1 iNl, which corresponds to the aperture area on the fluorescent surface side of the shadow mask.

The short length is 1Nd1, and the nine rectangular dot patterns (28) and the negative pattern corresponding to the aperture area on the electron gun side are each made O length f.
iN1. , short stroke Nd, rectangular dot pattern (29
), these two dot patterns (28)
and (29) are provided facing each other correctly on the front and back of each shadow mask, and the long diameter N of the dot pattern (29) is
The major axis Nl of the first negative (30) (red dot pattern (28) corresponding to 11'V' is made larger, and I[11Nd
Similarly, m is made smaller than 1Ndl. Therefore, the cross section in the horizontal axis takes the form of a large-diameter hole on the fluorescent surface side and a small-diameter hole on the electron gun side. Since the holes protrude Km in the Y direction from the negative pattern, they exhibit a shape 1 as shown in FIG.

Generally, when a hole as shown in FIG. 3 is formed in a shadow mask by corrosion, a tapered hole as shown in FIG. 4 is formed. Therefore, if this corrosion is drilled from only one direction on the fluorescent surface side, it is extremely difficult to drill through holes, ie, small diameter holes on the electron gun side, over the entire surface with high precision. Furthermore, even if the electron gun iml is used for corrosion, the depth of corrosion in the direction of the thickness of the slide cannot be made sufficiently small, making it extremely difficult to drill small diameter holes with high precision. In order to etch a small diameter hole with high precision, the width of this small hole is usually made larger than the thickness of the thick plate of the shadow mask. For this purpose, JP 11fi 51-90
As disclosed in Japanese Patent No. 35, a technique has been proposed in which a corrosion-resistant shield is provided on the surface of the small-diameter hole side of the dough mask and etched on both sides.

In the conventional etching method, the large-diameter hole side is first etched individually, and then both sides are etched.In contrast, in this method, when the large-diameter hole side is etched alone, the small-diameter hole side is etched with O etchant. This prevents leakage corrosion. Therefore, this method requires an additional step of applying a corrosion-resistant shield or the like to the WiK piece in advance, and then removing and rounding the WiK piece. However, although it is believed to be effective in suppressing uneven etching, the reason for forming holes with a minimum dimension smaller than the thickness of the material is unknown. The present inventors have confirmed that this is still difficult.

OBJECTS OF THE INVENTION The present invention has been made in view of the above-mentioned problems4, so that the aperture area on the electron gun side in the horizontal axis direction of all the slit-like apertures of the shadow mask is sufficiently small, and over the entire jltK. It is an object of the present invention to provide a color picture tube which is formed with high precision and is equipped with a nine shadow mask and which can obtain a color image of nine quality.

Summary of the Invention The color picture tube of the present invention has a shadow mask O*W having a slit-like aperture, in which the aperture area on the fluorescent image side is larger than the aperture area on the electron gun side, and By making the width in the horizontal axis direction of the inner thickness part of the shadow mask in the aperture area equal to or longer than the width in the horizontal axis direction of the front hole area on the phosphor surface side, the electron beam can be shadowed. The fluorescent light passes through a mask and strikes a predetermined gap to obtain a high-quality image.

Embodiments of the Invention Power 2 of the Invention - The picture tube is the same as the color picture tube shown in FIG. A detailed explanation regarding the configuration of the picture tube will be omitted.

Figure 47 is a 9-part cutaway sectional view of the slit-shaped mask of the color picture tube of the present invention, cut along a plane parallel to the X-axis direction, that is, the X-axis direction of the slit-shaped opening, passing through the center point of the slit-shaped opening. It is. The aperture area on the surface of the shadow mask 20 with slit-like apertures is larger in the aperture area on the fluorescent surface side (hereinafter referred to as large-diameter hole) than on the electron gun side (hereinafter referred to as small-diameter hole). It's hot.Furthermore, the thickness G in the horizontal axis direction of the inner thickness of the shadow mask O in the aperture area of the slit-like hole is larger than the thickness in the horizontal axis direction of the surface aperture area O on the fluorescent surface side. Forming the hole in the shadow mask shown in the figure, the round value is 0.30mm for the plate thickness T and 0.75 for the O arrangement pitch in the X-axis direction.
m, O array pitch in the Y-axis direction is 0.81 cm, bridge part with 0 width F in the longitudinal direction of one slit-like hole visible from the fluorescent surface side is 0.12 cm, slit-like opening 0511 hand visible from both sides of the fluorescent light A bank part with an inter-directional O@- of 0.25- is formed and is round, that is, a slit-like opening with a width G (o, 5sss) which is sufficiently large compared to the large diameter hole (61) 0 @ D (0,50■). It is formed into a hole. Small diameter hole (63) 0 @ W (0,
A slit-like opening is formed with a width w (0,201 m ) smaller than that of 22 mm. Furthermore, the wall thickness of the sy-chi part (65>) on the side of the small posterior hole (63) is approximately 0.
．． 05 to 0.08 g is the central axis of the small diameter hole (7
1), it is formed occupying a position of 90.25 to 0.30. If this slit-shaped shadow master is cut along a plane parallel to the longitudinal direction of the slit-shaped opening passing through the center point of the slit-shaped opening, the result will be as shown in FIG. 9. Furthermore, the bridge section (21) is viewed from the fluorescent surface side.
When the II shape was used, the strength of KJIIIiS (21) was further improved.

In order to corrode such a slit-like opening in a substrate for a shadow mask, a substrate with large-diameter holes of the first K is formed on both sides, and excessive etching is performed according to the pattern of the round-line photoresist film. As the corrosion progresses, the bottom of the corroded hole on the main hole side becomes nearly flat.

As the corrosion progresses in the thickness direction, it also corrodes the holes 1li111, so the speed of corrosion in the thickness direction slows down, making it difficult to control the degree of corrosion. The plate thickness t that corrodes the small-diameter hole becomes thinner, making it possible to corrode the small-diameter hole with sufficient precision and hardly corroding the side wall of the hole. Next, the substrate is etched from both sides to pass through the small diameter hole and the large through hole to form a slit-like opening. At this time, if the plate thickness is thin, that is, the plate thickness 'r is, for example, 0.10-0.2011.
When forming the slit-like openings of the present invention on the substrate No. 11,
A photosensitive resin film is applied to the surface on which the large diameter hole is to be formed using a negative on which a small pattern is formed on the large diameter hole (61) to be formed, and a pattern image is formed on the surface of the substrate.

By spraying a corrosive liquid onto this substrate, some S* corrodes and forms around the opening in the round hole, causing a round photosensitive resin film to fall into the hole. Therefore, as the corrosion progresses in the thickness direction of the substrate, the diameter inside the opening becomes larger than the opening diameter on the surface of the opening. The back surface of the substrate formed in this way) was corroded to form slit-like openings.

First, the order of corrosion may be on the large-diameter hole side and the small-diameter hole side alone, or it may be corroded at the same time.

Next, the relationship between the thickness T and the minimum width W of the shadow mask will be explained. In the above embodiment, the plate thickness T is the minimum width W in the horizontal axis direction of the thick portion of the shadow mask (hereinafter, the minimum width is 11w).
) can also take a large value. Here, in the design of a color picture tube, the minimum width W is correlated with the pitch of the phosphor strips. From the viewpoint of flexibility, even if the plate thickness T increases and 9, it is impossible to increase this gain by that much. Can not,
However, when the plate thickness T increases, in order to obtain the cross-sectional shape in the thickness direction as shown in Fig. 7, the opening area on the large diameter hole side must be increased commensurately. This is because it will not be possible to secure sufficient margin for the bank portion a6c. Therefore, it can be seen that even if the plate thickness T is increased beyond this range, no effect will be produced, and rather the formability of the shadow mask will become difficult.In other words, the limit of the plate thickness It has been experimentally confirmed that T≦1.75 w with T as a parameter. On the other hand, if the plate thickness T is increased, it is obvious that it becomes difficult to mold the shadow mask over one surface.

In reality, plate thickness T of approximately 0.35 m or less can be sufficiently formed using conventional techniques. However, the plate thickness T is approximately 0.35m
For shadow masks exceeding 111, it is necessary to shorten the length of the skirt part, and especially when the plate thickness T exceeds about 0.40 m, drawing becomes difficult. The range in which the assembly method and assembly accuracy of the color picture tube are not subject to exclusion as the plate thickness T increases is when the shadow master O plate thickness is approximately 0.40111 degrees, and those exceeding this are not preferred. If the plate thickness of the shadow mask is made thicker, the weight of the shadow mask increases, and the design of the entire shadow mask holding structure for securing the shadow mask to the panel side needs to be changed. The limit of master plate thickness is approximately 0.40 mm
*It is. Also, the minimum width of the shadow master is approximately 0.38
For wm, the pips in the X-axis direction are generally approximately L.
20 m to 1.50 wx), and can be applied to color picture tubes of about 30 to 35 inches in size. Furthermore, in this case, considering the power input to the color picture tube, the plate thickness is approximately 0.40111 mm.
14 degrees is plenty. And, generally speaking, such technology is
．． When applied to shadow masks of 10 m or less, the effect is weak in terms of mechanical strength and thermal deformation, and there is little industrial advantage.From the above, the preferred plate thickness T from the viewpoint of manufacturing technology for 7 Yadou masks. The relationship between and the minimum width W is aI
W≦T≦1.75 w, shown by the oblique ImA region in Figure 5.
, 0.10≦T≦040.

Furthermore, another embodiment of the present invention will be explained with reference to FIG.
Ru. Figure 9 shows the bridge mt-
In the example shown, the bridge portions are connected at least in part of the surface portion on the electron gun side. In other words, Jl negative (
The dot patterns of 30) are connected in the Y-axis direction, and the small hole shown in FIG. efr cut on a parallel plane passing through the center point! This is a diagram. That is, the small diameter hole (83) i4 of the bridge (81) is missing. This has the advantage that the flow of the corrosive liquid becomes gentler, the corroded shape becomes more uniform, and corrosion spots are less likely to occur. Furthermore, when forming the small hole @W and the width W of the small pole to be small, it has become possible to corrode accurately. Alternatively, contrary to FIG. 9, the bridge between the arrays of slit-like openings may be connected by at least a portion of the surface on the fluorescent side. That is, the JII2 negative (28) in Fig. 6 is
Connected in the axial direction, the bridging portion on the side of the large diameter hole (61) in Fig. II7 is removed by the corrosive liquid. In other words, in FIG. 9, the large diameter hole (82) II of the bridge (81) is missing. This has the advantage that conditions such as the flow of the corrosive liquid are gentle, the corroded shape is made uniform, and corrosion spots are less likely to occur.

Furthermore, when the electron beam is deflected by a deflection coil or the like and focused on the periphery of the mask, the deflection angle increases and the beam shadow increases. To prevent this, for example, at the right end of the X-axis, if the center line of the small-diameter hole in the Y-axis direction is shifted toward the tube axis direction rather than the center line of the large-diameter hole in the Y-axis direction, the plate thickness on the small-diameter hole side must be Since the portion t is sufficiently wide, it is possible to corrode the small diameter hole portion with the same high precision.

Effects of the Invention As described above, according to the present invention, in a nine-color receiving tube in which slit-like holes are arranged and provided with nine shadow masks, the thick part of the shadow mask in the axial hole region of the slit-like holes, The length in the horizontal axis direction is determined by increasing the length of the horizontal axis of all the slit-shaped holes of the shadow mask by making the length of the horizontal axis of the surface m aperture area on the fluorescent surface side equal. The zero width of the hole region is sufficiently small, and slit-like holes can be formed over the entire surface with high precision. Furthermore, since the opening width of the O-slit-shaped hole on the electron gun side, that is, the thin part of the plate on the small-diameter hole side, can be taken over a wide range, the vertical center line of the small-diameter hole and the large-diameter hole can be It is also possible to easily shift the vertical center line of the

[Brief explanation of drawings]

Fig. II1 is a partially cutaway perspective view showing the general structure of a conventional picture tube; Fig. 2 is a plan view of the main part of the shadow mask of the color picture tube shown in Fig. 1; A perspective view of the main parts of the picture tube's shadow mask. Figure 44 is a cross-sectional view of the main parts along the X-axis in Figures t and g3. Figure 5 is a cross-sectional view of the main parts along the Y-axis in Figure d3. The negative pattern of the shadow mask shown in Figure 43, 5! Model prisoner for uAr, 47
The figure is a cross-sectional view of the main part in the horizontal direction of the shadow mask applied to the color picture tube of the present invention, FIG. 8 is a characteristic diagram for explaining the relationship between the plate thickness T and the narrow width W of the shadow mask, and FIG.
Figure V is a vertical cross-sectional view of an essential part of an example of the present invention. (6)...electron gun (2)...three-color fluorescent surface +91pGI, CA...slit-shaped opening 0υ, (b
t)*(82)...j Slit-shaped opening QJ on the optical surface side,
(6J), (83)...Slit-shaped hole opening agent on the side of the 4-arm gun Patent attorney Nori Chika Akira (Ha2hl Nagisa) Figure 1 Figure 2 Figure 3 Figure 6 Figure 7 Figure 8 Figure 9

Claims (1)

[Claims] (1) A plurality of O
An electron gun that emits an electron beam, a fluorescent surface coated on one surface of a panel section at the other end of the outer panel connected from the netter section through a funnel-shaped seven-channel section, and a fluorescent surface and a predetermined In a color picture tube in which a large number of topic arrays in which a large number of slit-like apertures, which are spaced apart and facing each other and are arranged along a vertical axis, are arranged in a horizontal axis direction and provided with at least one shadow mask, the slit-like apertures are The surface aperture area of the shadow mask of the aperture is larger (than the aperture area on the electron gun side), and the aperture area on the fluorescent surface side is larger, and the shadow of the aperture area of the slit-like aperture is larger. A color picture tube characterized in that the width in the horizontal axis direction of both sides of the mask is equal to or longer than the width in the horizontal axis direction of the surface aperture area on the fluorescent surface side. (2) The thickness T of the shadow mask in the tube axis direction is approximately 0.
1G≦T≦0.40 (unit: ■) A color picture tube as described in Patent Claim OSS No. 1. (3) The color picture tube according to claim 1, wherein the bridge between the vertical arrays of the slit-like openings is connected at at least a part of the surface portion on the electron gun side. +4) The collar according to claim 8g1, wherein the bridging portion between the vertically arranged slit-like fighting holes marked # is connected by at least four portions of the surface portion on the fluorescent surface side. Picture tube. (5) When W is the minimum width of the slit-shaped opening in the horizontal axis direction corresponding to the inner thickness 'rs of the shadow mask, ! ≦T≦
1.75 W Claim a
O color picture tube described in item 11.