JPH04249048A - Flat plate type image display device - Google Patents

Abstract

PURPOSE:To prevent, deformation of electrodes in the form of flat plate by absorbing the thermal stresses generated in each flat plate electrode and a back plate. CONSTITUTION:Each ceramic sheet 15, 16 for fixation is provided with a through hole in its central part which is inserted between electrodes 4 in the form of flat plate so as to be concentrical with fixation holes 10 provided at the four corners of each flat plate electrode 4. The sheet 15 has a thickness smaller than the spacing of the electrodes 4, while the other 16 has a thickness the same as the spacing of the electrodes 4. The consolidated electrodes 4 are fastened with a certain constant torque by driving a fixation screw 11 into a screw hole 12 provided in a back plate 1 upon passing through an insulation bushing 9. Thereby thermal stresses eventually generated in the back plate 1 and the electrodes 4 consolidated when they are encapsulated in a vacuum vessel can be released by the resilience produced between the bushing 9 and a collar 8, which should preclude deformation of the electrodes 4 consolidated.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat display device used in video equipment.

0002

[Prior Art] In recent years, an attempt has been made to construct a device capable of displaying a color television image on a flat screen using an electron beam, and the screen is divided vertically into multiple sections. The electron beam is deflected vertically for each section to display multiple lines, and further divided horizontally into multiple sections to display R, G,
The phosphors such as B are made to emit light sequentially, and the R, G,
Some devices display a television image as a whole by controlling the amount of electron beam irradiation onto a phosphor such as B using a color video signal.

An example of the above-mentioned conventional flat panel display device will be described below with reference to the drawings.

As shown in FIG. 2, a typical flat panel display device has a structure in which, from the back to the front, there is a back electrode 1, a linear cathode 2 as an electron beam source, and a linear cathode 2 from the cathode 2. In order to converge the emitted line-shaped electron beam onto a predetermined phosphor on a screen 3 and further control the amount of irradiation, it is composed of a plurality of flat electrodes 4 stacked at a predetermined interval. These components are housed inside a front container 5 and a back container 6 made of glass or metal, and the inside of the container is evacuated.

In order to control the electron beam emitted from the cathode 2 as an electron beam source and irradiate the R, G, B, etc. phosphors on the screen 3 to display an image, a plurality of flat electrodes 4 are used. Each of the flat electrodes 4 must be electrically insulated with high accuracy at predetermined intervals, and a bonding glass must be installed at the joint part of each flat electrode 4 where the electron beam does not pass through. The flat electrodes 4 are bonded and fixed via these bonding glasses. Each of the bonded and integrated flat electrodes 4 is fixed to the back electrode 1 by a fixing screw.

FIG. 3 shows a method of fixing each of the flat electrodes 4, which are bonded and fixed into one piece, to the back electrode 1.

In FIG. 3, reference numeral 4 denotes each integrated flat electrode that has been precisely bonded and fixed in advance with a bonding glass 7, and 8 maintains a predetermined distance between each integrated flat electrode 4 and the back electrode 1. Collars 9 are insulating bushes inserted into fixing holes 10 provided at the four corners of each flat electrode 4 and integrated with fixing screws 11 to maintain insulation from each flat electrode 4. Each integrated flat electrode 4 is connected to a screw hole 12 provided in the back electrode 1 by passing a fixing screw 11 into an insulating bush 9.
It is firmly fixed by tightening the screws. Reference numeral 2 denotes a linear cathode, whose position is regulated by a cathode position regulating bar 13 fixed to the back electrode 1, and tension is applied by a cathode spring 14 attached to the cathode position regulating bar 13.

[0008]

[Problems to be Solved by the Invention] However, with this method of firmly fixing each integrated flat electrode by tightening fixing screws into the screw holes provided in the back electrode, it is necessary to When sealed in a container, each flat electrode was deformed due to thermal stress generated in each integrated flat electrode and back electrode, resulting in a significant deterioration in image quality.

An object of the present invention is to prevent deformation of each flat electrode and prevent deterioration of image quality by absorbing thermal stress generated in each flat electrode and the back electrode.

0010

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a flat display device in which a plurality of flat plate electrodes for control are arranged between a linear cathode and a screen on which a phosphor is arranged. When fixing each integrated flat electrode to the back electrode, a through hole is provided in the center between each flat electrode so that it is concentric with the fixing holes provided at the four corners of the multiple flat electrodes. A thin ceramic plate for fixing is inserted and fixed via the ceramic thin plate with fixing screws, and the thickness of the thin ceramic plate for fixing is thinner than the interval between each flat electrode, or A mixture of electrodes having the same thickness as the spacing between the flat electrodes is used.

[0011]

[Operation] According to the present invention, a thin ceramic plate for fixing with a through hole in the center is inserted between each electrode in the fixing holes provided at the four corners of a plurality of flat electrodes, and a fixing screw is used to fix the ceramic plate. When fixing to the back electrode via a thin plate,
By using a ceramic thin plate whose thickness is thinner than the intervals between each of the plurality of flat electrodes, or by using a mixture of ceramic thin plates having the same thickness as the respective intervals and thinner ceramic plates, the spring properties due to elastic deformation of the flat electrodes are utilized. By doing so, it is possible to absorb thermal stress generated in each flat electrode and the back electrode, prevent deformation of each flat electrode, and prevent deterioration of image quality.

0012

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. 1, with the same parts as those of the conventional example shown in FIGS. 2 and 3 being designated by the same reference numerals, and only the differences.

FIG. 1 shows the main structure of an embodiment of a flat display device of the present invention in which a plurality of flat electrodes are bonded and fixed to a back electrode.

In FIG. 1, reference numerals 15 and 16 have through holes in the center inserted between the flat electrodes 4 so as to be concentric with the fixing holes 10 provided at the four corners of the plurality of flat electrodes 4. The ceramic thin plate 15 is a fixed ceramic thin plate provided with a plurality of flat electrodes 4 at intervals of 0.4
The ceramic thin plate 16 has a thickness of 0.38 mm, which is 0.02 mm thinner than mm, and the ceramic thin plate 16 has a thickness of 0.4 mm, which is the same as the spacing between the plurality of flat electrodes 4. The other configurations are the same as the method of fixing each bonded and integrated flat electrode 4 to the back electrode 1 shown in FIG.

However, according to the method of the present invention shown in FIG.
By tightening with a certain torque, the peripheral part 4a of the fixing hole 10 of the plurality of flat electrodes 4, into which the fixing ceramic thin plate 15 thinner than the spacing between the plurality of flat electrodes 4 is inserted, becomes elastic. It is deformed and fixed by being sandwiched between the insulating bush 9 and the collar 8 using their spring properties. Therefore, even if thermal stress is generated in each integrated flat electrode 4 and back electrode 1 when these are sealed in a vacuum container, the thermal stress can be released by the springiness generated between the insulating bush 9 and the collar 8. Each integrated flat electrode 4
deformation can be prevented.

[0016]

Effects of the Invention As is clear from the above description, according to the present invention, a penetrating hole is formed in the center between the plurality of flat electrodes so as to be concentric with the fixing holes provided at the four corners of the plurality of flat electrodes. When inserting a fixing thin ceramic plate with a hole and fixing it to the back electrode via the ceramic thin plate with fixing screws, use a thin ceramic plate whose thickness is thinner than the distance between each of the plurality of flat electrodes, or By using a mixture of electrodes with the same spacing and thin electrodes, the elastic deformation of the flat electrodes is utilized to prevent deformation of the flat electrodes due to thermal stress when sealed in a vacuum container. This greatly contributes to improving the image quality of flat display devices.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing essential parts of an embodiment of a flat display device of the present invention.

FIG. 2 is a perspective view showing the basic configuration of a conventional flat display device and a flat display device of the present invention.

[Fig. 3] Cross-sectional view showing the main parts of a conventional flat display device

[Explanation of symbols]

1　　　　Back electrode 2 Cathode 3 Screen 4. Flat electrode 5　　Table container (vacuum container) 6　　　　Back container (vacuum container) 7 Bonding glass 10 Fixed hole part 11 Fixing screw 15 Ceramic thin plate 16 Ceramic thin plate

Claims (2)

[Claims] Claim 1: A linear cathode that is parallel to the screen and stretched horizontally at equal pitches in the vertical direction of the screen, a back electrode that pushes the linear electron beam emitted from the cathode to the front, and a back electrode that extends from the cathode to the front. A plurality of flat electrodes stacked at predetermined intervals to control the emitted line-shaped electron beam, a phosphor, and a bond provided in a portion of the plurality of flat electrodes through which the electron beam does not pass. It consists of a bonding glass that is placed in the section and crystallizes after melting, and a vacuum container for enclosing them. A fixing ceramic thin plate having a through hole in the center is inserted between the flat electrodes, and fixing holes provided at the four corners of the plurality of flat electrodes and the center of the fixing ceramic thin plate are inserted. A flat display device fixed to the plurality of flat electrode back electrodes by fixing screws inserted into through holes. 2. The thickness of the ceramic thin plate inserted between the plurality of flat electrodes so as to be concentric with the fixing holes provided at the four corners of the plurality of flat electrodes is equal to the distance between each of the plurality of flat electrodes. 2. The flat panel display device according to claim 1, wherein a display device having a spacing smaller than that is used, or a display device having the same spacing and a thinner display device are used in combination.