JPH0793114B2 - Image display device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an image display device utilizing thermoelectron emission.

Structure of Conventional Example and Problems Thereof In general, an image display device is one of the cathode ray devices utilizing thermionic emission. The structure of this image display device is shown in FIG.
In this display device, a cathode line 1 forming a thermoelectron emitter and a support 2 for supporting the same are arranged in a high vacuum, a mesh-shaped control electrode 3 is arranged on the cathode line 1, and a fluorescent body 4 is further arranged thereon. ing.

A base electrode 5 is placed below the cathode line 1 in order to actively emit thermoelectrons from the cathode line 1. However, the cathode ray 1 becomes longer and more likely to vibrate as the size of the fluorescent body increases. For example, when the distance between the supporting bases 2 of the cathode ray 1 is as large as 20 cm, the cathode ray 1 having a diameter of 20 to 30 μm vibrates about ± 20 to ± 100 μm. When the cathode ray 1 vibrates, the relative position with respect to the control electrode 3 changes, and there is a drawback that the image shakes or uneven brightness occurs.

OBJECT OF THE INVENTION It is an object of the present invention to provide an image display device which eliminates the above-mentioned drawbacks and which obtains a high-quality image with stable image brightness which is stable against both external vibration and electric vibration.

According to the present invention, there are provided a cathode line that emits thermoelectrons, a control electrode that controls the flow of thermoelectrons emitted from the cathode lines, a phosphor that receives the thermoelectrons to emit light, and displays an image; The fluorescent substance is provided with a back electrode provided so that electrons can be easily emitted from the cathode line, and a support for supporting the cathode line, and the cathode line is formed by one or a plurality of airless thin wires near the end. The image display device is sewn to each other in a substantially right-angled direction to the extent that the distortion of the image displayed by the device is not recognized, and the distortion occurs in the range of the deflection of the cathode ray. Even if an external force is applied to the cathode ray, the damping effect of the inorganic fine wire greatly attenuates the amplitude of the cathode ray, which has a peculiar effect that unevenness in brightness of an image does not occur.

Description of Embodiments One embodiment of the present invention will be described in detail below with reference to FIG. Reference numeral 1 is a conductive cathode line coated with a substance having thermionic emission capability such as barium oxide. Reference numeral 5 is a back electrode installed so as to easily generate thermoelectrons from the cathode line, so that indium is vapor-deposited on a glass substrate to form a conductive layer and a voltage can be applied. Reference numeral 3 is an electrode that controls the electrons emitted from the cathode ray so as to form a predetermined image. Reference numeral 4 denotes a fluorescent body which displays an image by the electrons passing through the control electrode emitting light.

Reference numeral 2 is a support member that spans the cathode lines.

Reference numeral 6 is a vibration-proof wire attached to damp the vibration of the cathode ray. The image display device configured as described above will be specifically described.

In FIG. 2, the cathode line 1 is stretched between the supports 2 with a tension of about 20 g. In order to ensure the mutual position of the cathode lines and the position of the electrodes with high accuracy, the support 2 is a frame in which V-grooves are processed in the portions supported by the cathode lines 1. When a pulsed voltage is applied to the cathode wire 1 to emit thermoelectrons, the temperature of the cathode wire 1 changes with time, and the natural frequency of the extended cathode wire 1 changes accordingly. Resonance occurs when the pulse period becomes substantially coincident with the pulse period. In the conventional example as shown in FIG. 1, since the cathode ray 1 is in a high vacuum, the damping effect of air does not work and the damping effect does not occur on its own. Vibrate.

In the present invention, as shown in FIG. 2, there is no disturbance in the image, that is, the end of the cathode ray (about 5 to 5 mm from the inside of the support).
A glass fiber vibration-proof wire 6 having a diameter of about 50 to 100 μm is laid at about 10 mm) in a direction substantially perpendicular to the cathode wire 1 as if sewn. That is, the cathode ray 1 and the antivibration ray 6
The anti-vibration line 6 which is stretched so that the upper and lower relationships change with each other and is laid on the second line is laid so that the upper and lower relationships are symmetrical with the first anti-vibration line 6.

As a result, the vibration-proof wire 6 is stretched with a light tension force of several grams or less even in a high vacuum, so that the contact portion with the cathode wire 1 does not form a fixed point of vibration, that is, a node, and it is reliable. As a result, the damping effect of the vibration-proof wire 6 and the cathode wire 1 appears even in a high vacuum, and the amplitude of the cathode wire 1 is about 200 microns, which was about 200 microns even in the resonance state. The fluctuation was less than the meter, and the fluctuation in brightness of the image was greatly reduced. Further, since the vibration-proof line 6 is stretched with a light tension force of about several grams or less, the mutual parallelism of the cathode lines 1 is about 10 μm or less, which cannot be perceived by the human eye as image distortion. Due to the anti-vibration effect, a very high quality image was obtained with less image fluctuation and brightness unevenness.

As described above, according to the present invention, it is possible to obtain a high-quality image without fluctuation of an image and brightness unevenness by reducing the amplitude of the cathode line by stitching a vibration-proof line to the end of the cathode line. The practical effect is enormous.

[Brief description of drawings]

FIG. 1 is a perspective sectional view of a conventional image display device, and FIG. 2 is a perspective sectional view of an image display device according to an embodiment of the present invention. 1 ... Cathode, 2 ... Support, 3 ... Control electrode, 4 ...
Fluorescent material, 5 ... Back electrode, 6 ... Anti-vibration line.

Claims (1)

[Claims] 1. A cathode ray that emits thermoelectrons, a control electrode that controls the flow of thermoelectrons emitted from the cathode rays, a phosphor that receives the thermoelectrons and emits light to display an image, and the thermoelectrons A back electrode provided so as to easily emit from the cathode line and a support for supporting the cathode line are provided, and the cathode line is displayed by the phosphor by one or a plurality of inorganic fine wires near the end. The image display device is sewn to each other in a substantially right-angled direction to such an extent that the distortions of the images are not recognized and the cathode rays are in the deflection range.