JPS5847820B2 - color - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a novel structure for a color picture tube, particularly in its fluorescent plane.

Generally, a color picture tube has a panel section 1, as shown in Figure 1.
, a funnel part 2, and a neck part 3.

In a striped color picture tube, an electron beam emitted from an in-line electron gun 4 disposed in a neck portion 3 passes through a shadow mask 5 having a large number of holes, and enters the panel portion 1. The light hits a striped phosphor 7 formed on the inner surface of the face plate 6, causing it to emit light.

Various proposals have been made regarding the shape of the through holes in the shadow mask 5, the shape of the striped phosphor 7, and the mutual relationship between the two.

FIG. 2 shows the shape of a striped fluorescent surface that is often used in recent color picture tubes.

Striped blue phosphor 7B, green phosphor 7G,
Red phosphors 7R are sequentially arranged at predetermined intervals, and a striped light absorbing material 8 made of carbon or the like is formed between each phosphor.

Reference numeral 9 indicates a spot of the electron beam that has passed through the hole in the shadow mask 5.

Since the width of the through hole is wider than the width of the striped phosphor 7, the electron beam passing through the through hole impinges on the phosphor surface in a wider range than the width of the phosphor 7.

In the first longitudinal direction, the through holes are arranged in the longitudinal direction of the striped phosphor 7 through seams, so that the electrons that pass through the through holes and strike the phosphor surface are The beam will be shorter in length than the phosphor 7.

The difference in width and length between the spot of the electron beam and the striped phosphor 7 is used as the width for color purity adjustment.

The conventional color picture tube described above has excellent performance, but in order to improve brightness and contrast, a light-absorbing substance 8 made of carbon or the like is formed between the striped phosphors. As a result, it took many man-hours to manufacture the fluorescent surface, and orders for production of color picture tubes were dropped.

The present invention was developed to improve the above-mentioned drawbacks, and its purpose is to improve productivity without using light-absorbing materials, and to provide a color picture tube with sufficient brightness and contrast. It is about providing.

In order to achieve this object, the present invention arranges striped phosphors at predetermined intervals on the inner surface of the face plate of a color picture tube, and then forms a metal back layer thereon to form the striped phosphors. Only a metal back layer is present between the phosphors.

The details of the present invention will be explained below. FIG. 3 is a front view of a part of the phosphor surface of an embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along the line A--A, with a shadow mask added thereto in a correlated manner.

1. On the inner surface of the face plate 10 of the color picture tube,
The phosphors 11 in the form of stripes extending vertically without any break are formed so as to be arranged in a certain order at a predetermined interval as a blue phosphor 11B, a green phosphor 11G, and a red phosphor 11R.

Here, the space 12 between each phosphor 11 is a gap.

This phosphor surface is wetted with water to fill the spaces between the phosphor particles to smooth the surface, and then methacrylic resin dissolved in an organic solvent is sprayed onto this surface and left to dry to form a uniform thin resin film. formal precepts.

Next, aluminum is deposited on the surface of this resin film in a vacuum.

At this time, the thickness of the anohenium vapor deposition layer is selected to be sufficient to allow the passage of an electron beam accelerated at a predetermined high voltage.

After the deposition, the resin film is removed by baking at a predetermined humidity, leaving a metal back layer 13 with a smooth inner surface on the phosphor side.

A shadow mask 15 having a large number of through holes 14 is placed opposite to the light emitting surface of the face plate 10.

Reference numeral 16 indicates a spot on the phosphor 11 of the electron beam that has passed through the through hole 14 of the shadow mask 15 and transmitted through the metal back layer 13.

The through holes 14 of the shadow mask 15 are arranged in the longitudinal direction of the striped phosphor 11 via seams, and the longitudinal cuts 17 of the spots 16 are the parts where the electron beam is masked by the seams. .

Since the width of the through hole 14 is larger than the width of the striped phosphor 11, the electron beam passing through the through hole 14 fluoresces in a strip-shaped spot 16 that is wider than the width of the phosphor 11 and has a shorter length. Fires at body 11.

Due to the difference in length and width between the phosphor 11 and the electron beam spot 16, the color purity can be easily adjusted as in the conventional case.

1. The electron beam that has passed through the through hole 14 of the shadow mask 15 passes through the aluminum metal back layer 13 and strikes each of the valley-colored phosphors 11B, 1 1G, and 1 1R, causing them to emit light. The emitted light passes through the face plate 10 of the switch 1 and exits to the front. In addition, the light reflected by the mirror surface of the metal back layer 13 also exits to the front plate, and most of the emitted light is irradiated to the front without loss. Ru.

As a result, the luminance of the phosphor can be increased by about twice that of the case without the metal back layer 13, and the phosphor can be made thinner to obtain the same luminance.

1. It has also been confirmed that the light that enters the face plate 10 from the outside and enters the space 12 between the phosphors 11 is diffusely reflected and scattered by the metal back layer 13 and does not reach the front direction where the TV viewer is located. According to the inventor's experiments, the reflection by the metal back layer 13 of the phosphor 11 is combined with the so-called black matrix type color picture tube in which a light-absorbing material is formed between the phosphors to achieve better brightness and contrast. A color picture tube with an excellent fluorescent surface was obtained.

Since the metal back layer 13 can prevent ion burn and X-ray burn, the life of the phosphor can be extended.

As described above, according to the color picture tube of the present invention, phosphors emitting different colored light are arranged in a striped manner in a fixed order at predetermined intervals on the collapse of the face plate, and A shadow mask having a large number of through holes is provided opposite to the phosphor so that the spot of the electron beam passing through the through holes is wider than the width of the phosphor and becomes shorter in the longitudinal direction. By bombarding a striped phosphor and further forming a metal back layer on the phosphor surface so that only the metal back layer exists between the phosphors, it is possible to Since no process is required to form between the phosphors, productivity is improved and costs are reduced.

The luminance of the phosphor increases due to the reflection by the metal back layer, and a luminescent material with excellent brightness and contrast can be obtained. There are various excellent effects such as reduction in the use of light material and cost reduction.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway view of a general color picture tube, FIG. 2 is a partial front view of the fluorescent surface of a conventional color picture tube, and FIG. 3 is a partial front view of the fluorescent surface of the present invention. Figure 4 is A-A in Figure 3.
This is a clear illustration. 1... Panel part, 2... Funnel part, 3... Neck part, 4... Electron gun, 5
... Shadow mask, 6 ... Face plate, 7 ... Fluorescence L10 ... Face plate, 11 ... Fluorescent body, 11B・
...Blue phosphor, 11G...Green phosphor, 11R...Red phosphor, 12...
... Intermediate part, 13... Metal back layer, 14...
...Through hole, 15...Shadow mask, 16
...Spot, 17...Break.

Claims (1)

[Claims] 1 The electron gun is located in the neck part, and the inside of the face plate [
It has a phosphor surface formed by arranging phosphors of different K emission colors in a stripe pattern at predetermined intervals in a predetermined order, and is spaced a predetermined distance from the phosphor surface in the direction of the electron gun. Shadow masks having a large number of through holes are placed opposite to each other, and the through holes of the shadow masks are arranged through seams in the longitudinal direction of the phosphor, so that the electron beam passing through one of the through holes is arranged on the phosphor. In a color picture tube in which the width of the spot is wider than the width of the phosphor and the length of the spot is shorter than the length of the phosphor, the phosphor surface on the inner surface of the face plate is A color picture tube characterized in that a metal pack layer is formed on top of the phosphor, and the metal pack layer is also present in the area between the phosphors.