JPH02186540A - Image displaying apparatus - Google Patents

Abstract

PURPOSE:To obtain uniform images by making the distance from two linear electrodes in both ends to an electrode, which takes out an electron beam and focuses the electron beam in an electron beam controlling means, closer than other linear cathodes. CONSTITUTION:The apparatus has a back side electrode 1 and linear electrodes 2a-2g, which are so installed while guided with linear electrode guides as to be parallel each other among the linear cathodes 2a-2g against the back side electrode 1, and an electron beam controlling means 3 controls electron beams taken out from the linear cathodes 2a-2g, and images are displayed on a phosphor screen 4. In this case, linear cathodes 2a, 2g in the both ends are so installed to have different height from other linear cathodes 2b-2f using linear cathode guides, that is both linear cathodes are so installed as to have closer distance from the electron beam controlling means 3. To take out electron beams from the linear cathodes 2a, 2g thus becomes easy and the intensity of electron beams taken from the linear cathode 2a, 2g becomes almost the same as that of other linear cathodes 2b-2f. By this method, uniform images without luminance irregularity are obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an image display device for video equipment.

2. Description of the Related Art Conventionally, this type of image display device has been proposed, for example, in Japanese Patent Application No. 62-28.
As shown in No. 8672, it had a structure as shown in Figure 2. Here, 5 is a back electrode, 6a to 6g are line cathodes, 7 is an electron beam control means, and 8 is a phosphor screen. Here, the plurality of wire cathodes 6a to 6g are stretched in the same plane1. Problem to be Solved by the Invention However, in such a structure, the two wire cathodes at both ends are Because a line cathode is adjacent to only one side, the installation conditions are different from other line cathodes that have line cathodes adjacent to both sides, and the electric field around the two line cathodes at both ends is different from that of the other line cathodes. Different from the surrounding electric field.

As a result, the amount of electron beams extracted from the two line cathodes at both ends becomes small, resulting in a problem that the image in the area of the two line cathodes at both ends becomes dark.

Therefore, the present invention provides an amount of electron beam extracted from the wire cathode by making the distance between the two wire cathodes at both ends and the electrode for extracting and focusing the electron beam in the electron beam control means closer than other wire cathodes. This is to align the images so that a uniform image can be obtained.

Means for Solving the Problems In order to solve the above problems, the image display device of the present invention has the following features: They are placed closer together than line cathodes.

Function The present invention has the above-mentioned configuration, by making the distance between the two line cathodes at both ends and the electrode for extracting and focusing the electron beam in the electron beam control means closer than that of other line cathodes. This makes it easier to take out the beam from the line cathode, thereby making it possible to equalize the amount of electron beams taken out from the line cathode and obtain a uniform image.

Embodiment Hereinafter, an image display device according to an embodiment of the present invention will be explained from the beginning with reference to the drawings. FIG. 1 is an exploded sectional view showing the configuration of an image display device in an embodiment of the present invention.

In the first, 1 is a back electrode, 2a to 2g are line cathodes,
Each of the linear cathodes 2a to 2g is guided by a linear cathode guide (not shown) so as to be parallel to the back electrode 1, and is stretched by a spring and a fitting. Electron beam control means 3
is an electrode for controlling the electron beam taken out from the line cathode to form an image. Reference numeral 4 denotes a phosphor screen, which emits light when struck by an electron beam controlled by the electron beam control means 3 to display an image.

The biggest feature of the image display device of this embodiment is that the line cathodes 2ia and 2g at both ends are connected to the other line cathodes 2b to 2g by line cathode guides.
The point is that the height is different from 2f, that is, in this embodiment, the distance from the electron beam control means 3 is shortened and the structure is stretched. That is, (distance L1 between the line cathodes 2a, 2g and the electron beam control means 3) and (distance L2 between the line cathodes 2b to 2f and the electron beam control means).

Next, the operation of the configuration of this embodiment will be explained. The line cathodes 2N and 2g are closer to the electron beam control means 3 than the other line cathodes 2b to 2f.
The electron beam from g is taken out from other line cathodes 2b to 2f.
As a result, at least the amount of emitted electrons generated is almost the same as that of the other line cathodes 2b to 2f. As a result, an image display device with uniform image quality can be obtained.

Effects of the Invention The present invention has two line cathodes at both ends and means for changing the distance to the electrode for extracting and focusing the electron beam in the sub-beat control means. The amount of electrons emitted from the line cathode of the book is at least equal to the amount of electrons emitted from the line cathode inside the book, and the amount of electron beam at the electron beam extraction electrode is at least equal to that of the line cathode, so a uniform image with no uneven brightness can be obtained at both ends of the screen. It is.

[Brief explanation of the drawing]

FIG. 1 is an exploded cross-sectional view of an image display device according to an embodiment of the present invention, and FIG. 2 is an exploded cross-sectional view showing a conventional image display device. 1... Back electrode, 2a to 2g... Line cathode, 3... Electron beam control means, 4... Phosphor screen.

Claims (1)

[Claims] a plurality of line cathodes, an electron beam control means for extracting electrons generated from the plurality of line cathodes as electron beams, a phosphor screen on which the electron beams extracted by the electron beam control means are irradiated; An image display device comprising means for variably setting the distance between two line cathodes at both ends of a book line cathode and an electron beam control means with respect to other line cathodes.