WO2003001554A1

WO2003001554A1 - Color selecting mechanism for cathode-ray tube and color cathode-ray tube

Info

Publication number: WO2003001554A1
Application number: PCT/JP2002/006160
Authority: WO
Inventors: Kouji Saita
Original assignee: Sony Corporation
Priority date: 2001-06-20
Filing date: 2002-06-20
Publication date: 2003-01-03
Also published as: JP2003007222A

Abstract

A color selecting mechanism for a cathode-ray tube enabling higher resolution of the cathode-ray tube by further making finer the pitches of grid elements. Slit-shaped electron beam passing openings (22) are parallel arranged in a color-selection electrode thin sheet (21) suspended on a frame. Grid elements (23) are provided among the slit-shaped electron beam passing openings (22). N rows (n is a positive integer) of slot-shaped electron beam passing openings (24) parallel to the slit-shaped electron beam passing openings (22) are arranged in each grid element (23). A high-definition high-resolution color cathode-ray tube having such a color selecting mechanism is also disclosed.

Description

Specification

Color selection mechanism for cathode ray tube and color cathode ray tube

The present invention relates to a color selection mechanism for a cathode ray tube and a color cathode ray tube including the color selection mechanism. Background art

One type of color selection mechanism for color cathode ray tubes is a color selection mechanism called an aperture grill.

In this aperture grill type color selection mechanism, a color selection electrode thin plate made of a metal thin plate is stretched over a frame-shaped metal frame composed of a pair of opposing support members and a pair of members welded to the support members. are doing.

Then, slit-shaped electron beam communication holes are formed at a predetermined pitch in the color-selecting electrode thin plate, thereby forming a tape-like Daridian element between the electron beam passage holes, and forming a color-specific dalipid body. A grid is formed to select the electron beam corresponding to the phosphor.

In recent years, there has been an increasing demand for higher definition and higher resolution in color cathode ray tubes.

Along with this, the color selection mechanism is also required to be miniaturized.

In order to achieve high definition and high resolution, it is necessary to make the pitch of the grid element of the color selection mechanism finer.

However, as described above, when the pitch of the grid element of the color selection mechanism becomes smaller, the width of the tape-shaped grid element becomes narrower, and the strength of the grid element itself decreases. Would.

For this reason, in the etching process for forming slit-like electron beam passage holes in the color selection electrode thin plate, pitch unevenness and line disturbance are caused. This causes problems.

In addition, when the pitch of the grid body is fine, the effect of the residual stress of the material due to the tension applied when the electrode plate for color selection is stretched over the frame increases.

Then, in the blackening heat treatment step of the color selection mechanism, the residual stress is released, so that line-like deformation (streak) occurs.

In addition, by increasing the screen resolution by reducing the pitch of the elementary body, the shadow of the damper that is provided across the grid to suppress grid resonance is more noticeable. It is becoming. In particular, when the pitch of the grid element is as small as 0.2 mm to 0.25 mm or less, the pitch becomes almost indistinguishable to the naked eye, but the shadow of the damper line becomes more noticeable. .

At such a fine pitch, the grid element body becomes extremely thin, so that the strength is remarkably deteriorated, and the adverse effects such as the uniformity and the swaying of the color selecting electrode thin plate become remarkable. Disclosure of the invention

In order to solve the above-described problem, the present invention includes a color selection mechanism for a cathode-ray tube capable of reducing the grid element pitch and increasing the resolution of the cathode-ray tube, and a color selection mechanism for the cathode-ray tube. It provides a high-definition, high-resolution color cathode ray tube.

The color selection mechanism for a cathode ray tube according to the present invention is a color selection mechanism in which a color selection electrode plate is stretched over a frame, and a large number of slit-like electron beam passage holes are formed in the color selection electrode plate in parallel. As a result, a grid element is formed between the slit-shaped electron beam passage holes, and a slot-shaped body is formed in each Darid element body in parallel with the slit-shaped electron beam passage hole. The rows of electron beam passage holes are arranged in n rows (n is a positive integer). It is something.

In the color cathode ray tube of the present invention, a thin electrode for color selection is stretched on a frame, and a plurality of slit-shaped electron beam passage holes are formed in the thin electrode for color selection in parallel with each other. A dalide element is formed between the electron beam passage holes of each grid, and a slit-like electron beam is formed in each grid element.

—It is equipped with a color selection mechanism in which n rows of slot-like electron beam passage holes are arranged in parallel (n is a positive integer) in parallel with the passage holes.

According to the structure of the color selection mechanism for a cathode ray tube of the present invention described above, n rows of slot-like electron beam passage holes are provided in each grid element in parallel with the slit-like electron beam passage holes. (N is a positive integer), so that the number of rows of electron beam passage holes in the slit and slot is approximately (n + 1) of the number of grid elements. It is twice as many.

Thus, the number of rows of electron beam passage holes can be reduced without increasing the number of grid elements.

Further, in the row of the slot-like electron beam passage holes, the electrode plate for color selection remains between each slot-like passage hole. The remaining portion extends the tape-shaped portion on both sides of the row of slot-shaped electron beam passage holes to form a grid element body, so that a conventional tape-shaped grid element is formed. Compared to the body, the structure is more resistant to deformation. According to the above-described configuration of the cathode ray tube of the present invention, the electrode plate for color selection is stretched over the frame, and a large number of slit-shaped electron beam passage holes are formed in the electrode plate for color selection in parallel. A grid element is formed between the slit-shaped electron beam passage holes, and a slot-shaped electron beam is formed in each Darid element body in parallel with the slit-shaped electron beam passage hole. Equipped with a color selection mechanism with n rows of beam passage holes (n is a positive integer), increasing the number of electron beam passage holes for resolution The degree can be increased, and the occurrence of line disturbance or the like due to the deformation of the grid body can be suppressed. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a plan view of a color selecting electrode thin plate of a color selecting mechanism according to an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram of an embodiment of a color selecting mechanism to which the present invention is applied ( FIG. 3 is a schematic configuration diagram (a perspective view showing a part of the inside) of a color cathode ray tube, and FIG. 4 is a color selection mechanism of another embodiment of the present invention. FIG. 5 is a plan view of a conventional color-selecting electrode thin plate, and FIG. 6 is a plan view of a conventional color-selecting electrode thin plate according to the present invention. FIG. 7 is a plan view showing an irradiation area of the electron beam on the phosphor screen when the electrode plate for color selection of FIG. 6 is used, and FIG. 8 is a conventional color selection. FIG. 5 is a plan view showing an irradiation area of an electron beam on a phosphor screen when a thin electrode plate is used. BEST MODE FOR CARRYING OUT THE INVENTION

The present invention relates to a color selection mechanism in which a color selection electrode thin plate is stretched over a frame, and a number of slit-like electron beam passage holes are formed in the color selection electrode thin plate in parallel with each other. A grid element is formed between the slit-shaped electron beam passage holes, and a slit-shaped electron beam passes through each grid element body in parallel with the slit-shaped electron beam passage hole. This is a color selection mechanism for cathode ray tubes in which n rows of holes are arranged (n is a positive integer).

According to the present invention, a thin electrode plate for color selection is stretched over a frame, and a large number of slit-shaped electron beam passage holes are formed in the thin electrode plate for color selection in parallel with each other. A dalit element is formed between the holes, and parallel to the slit-shaped electron beam passage hole in each grid element. In addition, this is a color cathode ray tube equipped with a color selection mechanism in which n rows of slot-like electron beam passage holes are arranged (n is a positive integer).

First, FIG. 2 shows a schematic configuration diagram of one embodiment of a color selection mechanism to which the present invention is applied.

The color selection mechanism 51 is a color selection mechanism of the type referred to as the aperture grille described above, and includes a pair of opposing support members 52, 53 and a pair of opposite ends of the support members 52, 53. A frame-shaped metal frame 56 composed of a pair of elasticity imparting members 54 and 55 welded so as to be inserted is provided, and the supporting members 52 and 53 of the frame 56 facing each other. An electrode plate 60 for color selection having a large number of slit-like electron beam passage holes 59 is stretched on one direction, that is, in the horizontal direction of the screen (X direction).

The electrode plate 60 for color selection is made of, for example, a thin metal plate made of stainless steel, and a number of thin tape-shaped dalide elements 58 are arranged at a predetermined pitch in the above-mentioned one direction. A slit-like electron beam passage hole 59 long in the direction perpendicular to the screen is formed between the element bodies 58.

In addition, a damper wire 57 is provided on the effective screen area of the color selection electrode thin plate 60 in a state perpendicular to the longitudinal direction of the electron beam passage hole 59. The damper wire 57 is supported by members attached to the elasticity imparting members 54, 55, and is stretched with a predetermined tension on the color selecting electrode thin plate 6Q. In this color selection mechanism 51, two damper wires 57 are provided, and both of them make contact so as to press the grid element 58 against the grid element 58 of the color selection electrode thin plate 60. are doing.

FIG. 3 shows a schematic configuration diagram (a perspective view showing a part of the inside) of a color cathode ray tube provided with the color selection mechanism 51 having the above configuration.

The color cathode ray tubes 61 are each formed of, for example, glass. The formed panel portion 61a and the funnel portion 61b are connected by a sealing portion 63 to form a cathode ray tube.

A fluorescent screen (not shown) is formed on the inner surface of the front surface of the panel section 61a of the cathode ray tube, and the color selection mechanism 51 having the above-described configuration is arranged so as to face the fluorescent screen at a predetermined interval. Have been.

The electron beam EB emitted from the electron gun 62 provided in the neck portion 61 c of the cathode ray tube is guided to the phosphor screen through the electron beam passage hole 59.

Next, specific embodiments of the present invention will be described.

FIG. 1 is a schematic plan view of a color selecting electrode thin plate of a color selecting mechanism for a color cathode ray tube as one embodiment of the present invention.

The color selecting electrode thin plate 21 is formed of a metal thin plate, and is used for a color selecting mechanism for a color cathode ray tube.

That is, the color selection mechanism can be configured by using the color selection mechanism 51 shown in FIG. 2 instead of the color selection electrode thin plate 60.

The thin electrode for color selection 21 has, as an opening, a slit-shaped electron beam passage hole 22 whose longitudinal direction is the vertical direction in the figure, which is the direction perpendicular to the screen of the cathode ray tube (Y direction). Many are formed at the same pitch.

The tape-shaped portion, that is, the grid element 23 left between the electron beam passing holes 22 of the color selection electrode thin plate 21 corresponds to the phosphor of each color on the phosphor surface of the color cathode ray tube. A grid for selecting the electron beam is constructed.

The plan view of FIG. 1 schematically shows the configuration of the electrode plate 21 for color selection, and the actual electrode plate 21 for color selection has a large number of grid elements 2. 3 and an electron beam passage hole 22 are formed.

In the electrode plate 21 for color selection of the present embodiment, in particular, the tape A rectangular slot-shaped electron beam passage hole 24 is formed in the center of each grid element body 23 in the shape of a rectangle. The rectangular slot-like electron beam passage holes 24 have a longitudinal direction in the vertical direction in the figure, and a large number of rectangular slot-like electron beam passages 24 have a predetermined interval D1 and a slit-like shape. It is arranged in a row parallel to the electron beam passage holes 22.The distance between the rectangular slot-like electron beam passage holes 24 and the left and right slit-like electron beam passage holes 22 is also constant. Therefore, when the rectangular slot-like electron beam passage hole 24 and the slit-like electron beam passage hole 22 are combined, the slit-like electron beam passage hole 22 and the grid are formed. The electron beam passage holes 22 and 24 are arranged at a half pitch (P / 2) of the pitch P of the element body 23.

Since the rectangular slot-shaped electron beam passage hole 24 is formed in the center of the grid body 23 in this way, the electron beam passes through the electron beam passage hole 24. Color sorting can be performed. Therefore, it is possible to allow the electron beam to pass through the Dalide element body 23 as well.

In addition, a thin electrode plate 21 for color selection remains between the rectangular slit-like electron beam passage holes 24 arranged vertically, and this portion (hereinafter referred to as a bridge portion 23B) forms a rectangular slot. A grid element 23 is formed by connecting and integrating two tape-shaped portions on the left and right of the hole-shaped electron beam passage hole 24.

Further, the positions of the rectangular slot-like electron beam passage holes 24 that are opened in every other row are vertically shifted from each other.

That is, the leftmost row of rectangular slot-like electron beam passage holes 24 in FIG. 1 and the second row of rightmost rectangular slot-like electron beam passage holes 24 in FIG. The position is shifted downward. On the other hand, the rows of the second rectangular slot-like electron beam passage holes 24 from the left and the rightmost row of the rectangular slot-like electron beam passage holes 24 have their apertures shifted upward. I have.

In this way, by shifting the position of the rectangular slit-shaped electron beam passage holes 24 up and down every other row, the distribution of luminance in the vertical direction over the entire display screen can be smoothed.

In addition, since the vertical position of the bridge portion 23B is not in a straight line, the shadow of the bridge portion 23B is not conspicuous on the screen.

When the electron beam passage holes 22 and 24 have a fine pitch that cannot be discerned by the naked eye, the pattern of the slit-like electron beam passage holes 22 and the rectangular slot-like electron beam passage holes 2 Since pattern 4 cannot be distinguished, s ^ and Ββ are combined with the integrated pattern.

Here, as a comparative control, FIG. 5 shows a plan view of a conventional aperture grill type thin plate for color selection similar to the thin plate for color selection 60 shown in FIG. As shown in FIG. 5, a large number of slit-like electron beam passage holes 59 are formed at a constant pitch P in the thin electrode for color selection 60.

In the configuration shown in Fig. 5, the pitch P of the slit-like electron beam passage holes 59 is narrowed, and the number of the electron beam passage holes 59 is increased. It can be seen that the strength of the body 58 decreases as the width of the body 58 decreases.

On the other hand, in the electrode plate 21 for color selection according to the present embodiment, a grid element 23 is formed by joining and integrating two tape-shaped portions by a bridge portion 23B. Therefore, the strength of the grid body 23 can be improved as compared with the single tape-shaped grid body 58.

A rectangular slit-shaped electron beam passage hole 24 and a slit-shaped electron beam All of the film passage holes 22 can be formed by etching the electrode plate 21 for color selection.

Etching is performed by using a mask having a pattern corresponding to the rectangular slot-like electron beam passage holes 24 and the slit-like electron beam passage holes 22, whereby these electron beam passage holes are formed. The holes 22 and 24 can be formed simultaneously.

In addition, the electrode plate 21 for color selection of the present embodiment is stretched over the support members 52 and 53 of the frame 56 shown in FIG.

A color selection mechanism can be configured similarly to the color selection mechanism 51 in FIG. Then, the elasticity imparting members 54 and 55 apply a predetermined tension in the screen vertical direction (Y direction) to each grid element body 23 of the color selecting electrode thin plate 21.

That is, the thin plate for color selection electrode 21 of the present embodiment can be manufactured by using the same frame 56 as the color separation mechanism 51 of the conventional aperture grill type by the same manufacturing process as the conventional one. Therefore, the production is easy and the increase in production cost is small.

Then, in the same manner as in a normal color selection mechanism, the thin plate for color selection 21 is used as a mask, and the grid element 23 and the electron beam passing holes 22 and 24 are used to perform exposure. By performing the above, phosphors corresponding to the three colors R, G, and B can be sequentially formed in a predetermined pattern on the inner surface of the panel portion of the cathode ray tube.

Also, in the color sorting mechanism using the electrode thin plate 21 for color sorting of the present embodiment, the grid element 2 is similar to the conventional color sorting mechanism 51.

A damper wire for suppressing the swing of 3 can be provided. In particular, when the number of rows of the electron beam passage holes 22 and 24 is increased to improve the resolution, the width of the tape-shaped portion of the grid body 23 becomes narrower than in the conventional case, which tends to cause shaking. Therefore, it is desirable to provide a damper line to prevent shaking. In the electrode plate 21 for color selection of the present embodiment, the bridge portion 23B remains between the rectangular slot-like electron beam passage holes 24, so that the bridge portion The shadow of 23 B makes the shadow of Damba line inconspicuous.

According to the above-described embodiment, the slit-shaped electron beam passage hole is provided.

A grid element 23 is formed between 22 and a row of slot-like electron beam passage holes 24 is formed at the center of each grid element 23 through a slit-like electron beam. Since the holes are formed in parallel with the holes 22, the number of rows of the electron beam passage holes 22 and 24 can be approximately twice the number of the grid element bodies 23.

As a result, for example, when the width and pitch P of the grid element body 23 are the same as in the conventional case, the number of rows of the electron beam passage holes 22 and 24 can be approximately doubled. It is possible to increase the horizontal resolution to about twice that of the conventional one and achieve higher resolution.

Also, if the number of rows of the electron beam passage holes 22 and 24 is increased from the conventional one, for example, to about 1.5 times the conventional one, the width of the tape-shaped part of the grid element body 23 becomes larger than the conventional one. Instead of narrowing, the two tapes are connected side by side at the bridge portion 23B to form the grid body 23, so the width and strength of the grid body 23 are improved compared to the past. It can be done.

That is, even if the horizontal resolution is improved and the resolution is increased, the strength of the grid body 23 is ensured to suppress the occurrence of pitch unevenness and line disturbance in the etching process. It is possible to suppress the deterioration of the image quality caused by the deformation of 3 (due to the influence of residual stress, etc.).

By configuring the color selection mechanism using the color selection electrode thin plate 21 of the above-described embodiment, even if the number of rows of the electron beam passage holes 22 and 24 is larger than in the past, the grid element body is formed. 2 3 strength Accordingly, it is possible to suppress the occurrence of line disturbance or the like due to the deformation of the grid body 23 (due to the residual stress or the like).

Since the grid element 23 has a structure in which two tape-shaped parts are connected by a bridge portion 23B, the number of rows of electron beam passage holes 22 and 24 is conventionally reduced. Even if it is larger, the width of the grid element 23 does not become narrow. Thereby, in the etching step for forming the electron beam passage holes 22 and 24, occurrence of pitch unevenness and line disturbance can be suppressed.

Accordingly, a color selection mechanism using the color selection electrode thin plate 21 of the present embodiment is provided, and a glass such as a color cathode ray tube 61 shown in FIG. 3 is provided.

By constructing a cathode ray tube, it is possible to increase the number of rows of electron beam passage holes in the color selection mechanism to achieve high definition and high resolution of the color cathode ray tube, and to achieve high definition and high resolution color cathode ray tubes. Pipes can be manufactured stably and with good yield.

In addition, due to the small width of the plunger portion 23B corresponding to the interval D1 between the slot-like electron beam passage holes 24, the shadow of the damper line is not noticeable on the screen of the empty cathode ray tube. can do. Next, as another embodiment of the present invention, FIG. 4 shows a schematic plan view of a color selecting electrode thin plate of a color selecting mechanism for a color cathode ray tube. In the electrode plate 25 for color selection of the present embodiment, each grid element 2

In row 3, two rows of rectangular slot-shaped electron beam passage holes 24 are provided.

As a result, the number of rows of the electron beam passage holes 22 and 24 is about three times the number of the grid elements 23.

In addition, the rows of the electron beam passage holes 22 and 24 are grid element 2

The pitch is 3 (the pitch of the slit-shaped electron beam passage holes 22). The pitch is 1/3 of P (P / 3).

Other configurations are the same as the electrode plate 21 for color selection of the previous embodiment. It is like.

According to the present embodiment, the number of rows of the electron beam passage holes 22 and 24 is set to be approximately three times the number of the Dalide element bodies 23 and the color selecting electrode thin plate 2 of the previous embodiment is set to be three times. It can be more than one.

As a result, for example, when the width and pitch P of the grid element 23 are the same as the conventional one, the number of rows of the electron beam passage holes 22 and 24 can be made about three times the conventional number. However, by increasing the horizontal resolution to about three times the conventional one, high definition and high resolution can be achieved, and an ultra-high definition cathode ray tube can be realized.

If the number of rows of holes 22 and 24 for electron beam passage is increased from the conventional one, for example, to about 1.5 to 2.5 times the conventional one, the grid element The width of the part is narrower than before, but the three tapes are connected side by side at the bridge part 23B to form the grid body 23. Can improve the width and strength.

That is, even if the horizontal resolution is improved and the resolution is increased, the strength of the grid body 23 is ensured to suppress the occurrence of pitch unevenness and line disturbance in the etching process, and the grid body 23 is improved. This makes it possible to suppress the occurrence of image quality deterioration due to deformation (due to residual stress, etc.).

The electrode plate 25 for color selection according to the present embodiment also uses the same frame 56 as the conventional color selection mechanism 51, similarly to the electrode plate 21 for color selection according to the previous embodiment. The mechanism can be configured, manufacturing is easy, and the increase in manufacturing cost is small.

Then, in the same manner as a normal color selection mechanism, phosphors corresponding to the three colors R, G, and B are sequentially specified on the inner surface of the panel portion of the cathode ray tube using the color selection electrode thin plate 25 as a mask. It can be formed in the following pattern. Further, by providing a color cathode-ray tube such as the color cathode-ray tube 61 shown in FIG. 3 by providing a color selection system using the color selection electrode thin plate 25 of the present embodiment, By increasing the number of rows of electron beam passage holes in the sorting mechanism, it is possible to achieve high definition and high resolution of the color cathode ray tube, and to produce high definition and high resolution color cathode ray tubes stably and with good yield. It becomes possible.

In addition, the bridge portion 23 B having a small width corresponding to the interval D 1 between the slot-like electron beam passage holes 24 prevents the shadow of the damper line from being conspicuous on the screen of the empty cathode ray tube. can do.

Here, the effect of the phosphor screen on the effective screen area was compared with the conventional aperture.

—Compare a grille type color selection mechanism with the color selection mechanism according to the present invention.

First, FIG. 6 is a plan view showing an opening shape of one embodiment of the color selecting electrode thin plate according to the present invention. In the configuration shown in FIG. 6, a rectangular slot-shaped electron beam passage hole 24 is provided between each grid element 23 as in the color selection electrode thin plate 21 shown in FIG. Are arranged in columns. In FIG. 6, the dimensional ratio such as the aspect ratio of the rectangular slot-shaped electron beam passage hole 24 is different from that in FIG.

FIG. 7 is a plan view showing the irradiation area of the electron beam on the phosphor screen when the electrode plate for color selection shown in FIG. 6 is used. In FIG. 7, reference numeral 30 denotes the shadow of Damba. · The electron beam is irradiated to three spots corresponding to the phosphors of three colors (R, G, B) corresponding to the electron beam passage holes 22 and 24, respectively.

In FIG. 7, the irradiation area in the vertical direction is slightly reduced due to the shadow of the plunger portion 23B, but this is not so much as to cause a problem.

And, due to the shadow of the bridge portion 23B, the shadow 30 of the damper line becomes less noticeable.

On the other hand, the fluorescent screen in the case of using the conventional electrode plate for color selection FIG. 8 is a plan view showing the irradiation area of the electron beam in the inside. FIG. 8 shows the case where the transmittance in the electron beam passage hole, the pitch of the row of the electron beam passage hole, and the diameter of the damper wire are set to be the same as those in FIGS. The pitch of the rows is narrower than the normal pitch according to Figs. 6 and 7.

In Fig. 8, the pitch of the row of electron beam passage holes is narrower than usual, so the grid element is thinner and the vertical shadow is thinner. ing. Compared to Fig. 7, it is clear that it is noticeable.

That is, by comparing FIGS. 7 and 8, it can be seen that, in the configuration of the color selection electrode according to the present invention, even if the number of rows of electron beam passage holes is increased and the resolution is increased, the shadow of the damper line is not excessive It turns out that it is possible to make it less noticeable.

Therefore, it is possible to realize a damperless image quality.

In a color selection mechanism using a color selection electrode thin plate with a slot-shaped opening, the color selection electrode thin plates are all connected and integrated in the horizontal direction of the screen even within the effective screen area. A so-called doming phenomenon occurs.

This dominating phenomenon is, for example, when an electron beam is applied to only a part of the effective screen area to display a color, and the remaining area is displayed in black, and an electron beam is emitted. Only in a part of the area where the beam is irradiated, the color-selecting electrode sheet expands due to the temperature rise, and the color-selecting electrode sheet in this area rises.

On the other hand, in the configuration of the color selection mechanism of the present invention, since the slit-shaped electron beam passage holes are basically formed, a large number of color selection electrode thin plates are formed in the effective screen area. It is separated into do primes. Each grid element is framed vertically (Y Direction), and even if thermal expansion occurs in the grid body, the expansion of the grid body is canceled by the frame, so that the doming phenomenon does not occur.

In the present invention, the opening shape of the slot-shaped electron beam passage hole is not limited to the rectangular shape of each of the above-described embodiments, but may be any other shape such as an elliptical shape, a square shape, and a circular shape. It is also possible.

As in each of the above-described embodiments, when the shape of the slot-like electron beam passage holes 24 is rectangular with the longitudinal direction in the screen vertical direction (Y direction), the aperture ratio is higher than in other shapes. Has the advantage that it can be increased.

Further, regarding the row of slit-shaped electron beam passage holes and the row of slot-shaped electron beam passage holes, the ratio of the number of rows and the arrangement of each row are not limited to the above embodiments. Other configurations are also possible.

However, in the present invention, at least each of the slit-shaped electronic

—N rows of slot-like electron beam passage holes are arranged between the holes (n is a positive integer). In this case, the ratio of the number of rows is approximately 1: n, and the pitch of the rows of the electron beam passage holes 22 and 24 is the pitch of the grid element 23 (= the slit-like electron beam passage holes). 22 pitch) 1 / n of P.

As a result, n rows of slot-like electron beam passage holes 24 are arranged in each dalip element body 23, and the shape and width of each grid element body 23 become the same, and each grid element 23 becomes the same. Since the pad bodies 23 are evenly arranged, the effect can be exerted on the entire screen.

Incidentally, the ratio of the number of rows between the slit-shaped electron beam passage holes and the slot-shaped electron beam passage holes is other than 1: n (n is an integer), for example, 2: 1 or 2: 3. Or when two rows are alternately arranged, for example, the slit-shaped electron beam passage holes have two or more rows. It has a continuous part.

The pitch of each row of the electron beam passage holes is almost constant because the phosphors are battered using the color selection electrode thin plate as a mask. In a place where two or more rows are continuous, the grid element body becomes thinner than the other places, so that the above-described problem occurs. Therefore, the effect cannot be exerted on the entire screen.

Also, as described above, in order to make the pitch of each row of electron beam passage holes almost constant, each row of slot-like electron beam passage holes is arranged at a fixed pitch in the grid body. .

In this way, the cross section of the color selecting electrode thin plate becomes substantially symmetric in the horizontal direction.

In addition, the dalide element body has a structure in which a plurality of tape-shaped portions having the same width are connected side by side by a bridge portion.

As a result, the phosphor patterns are evenly arranged and formed.

The distribution of tension applied to the grid element can be evenly distributed.o

Further, similarly, from the viewpoint of balance of tension and the like, it is desirable that the electron beam passage holes formed at the end row, that is, the left and right ends in the horizontal direction of the screen, are slit-like electron beam passage holes.

The present invention is not limited to the above embodiments, and various other configurations can be adopted without departing from the gist of the present invention.

According to the present invention described above, the number of rows of the electron beam passage holes can be set to about n times the number of the Dalit elements, so that the number of the electron beams can be increased without increasing the number of the grid elements so much. The resolution can be improved by increasing the number of rows of passage holes. This makes it possible to improve the resolution without reducing the width of each grid element.

Further, according to the present invention, the grid body includes a plurality of tape-shaped portions. Since the structure is connected sideways, the strength of each grid element can be improved.

That is, according to the present invention, since the strength of each of the grid elements is improved, and the resolution can be improved without reducing the width of each of the grid elements, the pitch unevenness in the etching step can be improved. And the occurrence of line disturbance can be suppressed, and the occurrence of line disturbance due to deformation due to the residual stress of the Dalide element body can be suppressed.

Therefore, according to the present invention, it is possible to increase the number of rows of electron beam passage holes of the color selection mechanism to achieve high definition and high resolution of the color cathode ray tube, and to realize a high definition and high resolution color cathode ray tube. Yield can be manufactured stably.

In addition, the portion where the electrode plate for color selection remains (the bridge portion) between the slot-like electron beam passage holes prevents the shadow of the damper line from being noticeable on the screen of the empty CRT. be able to.

Further, since the color selection mechanism for a cathode ray tube of the present invention can be manufactured in the same manufacturing process using the same frame as the conventional color selection mechanism, the manufacturing is easy and the increase in manufacturing cost is small. .

Claims

The scope of the claims

A color selection mechanism in which a thin plate for color selection is stretched over the frame,

A plurality of slit-shaped electron beam passage holes are formed in the color selection electrode thin plate in parallel, and a grid element is formed between the slit-shaped electron beam passage holes.

In each of the above-mentioned grid elements, n rows (n is a positive integer) of slot-like electron beam passage holes are arranged parallel to the slit-like electron beam passage holes.

A color selection mechanism for a cathode ray tube, characterized in that:

The frame is covered with a thin electrode for color selection,

A plurality of slit-like electron beam passage holes are formed in the color selection electrode thin plate in parallel, and a grid element is formed between the slit-like electron beam passage holes.

Color sorting in which n rows (n is a positive integer) of slot-like electron beam passage holes are arranged in each of the above-mentioned Dalyd elements in parallel with the above-mentioned slit-like electron beam passage holes. Equipped with a mechanism

A color cathode ray tube characterized by the following.