JPS6158148A - Picture display device - Google Patents

Abstract

PURPOSE:To reduce the amplitude of two or more cathode wires and prevent the fluctuation of a picture by supporting the two or more cathode wires on a support body and providing vibration-proof wires made of glass fiber almost in the direction making right angles against the cathode wires as if sawn together. CONSTITUTION:A picture display device is configured by supporting two or more cathode wires 1 and arranging a back electrode 5 at the back and a mesh type control electrode 3 and phosphor 4 in the front. In this case, vibration-proof wires 6 made of glass fiber having approximately 50 to 100 mum diameters are provided in the vicinity of the end of the cathode wires 1 that do not affect the picture almost in the direction making right angles against the cathode wires 1 as if sawn together. As a result, even if such external force that the cathode wires 1 can be set to the resonance state is applied, the amplitude can sharply be damped by the damping operation of the vibration- proof wires 6 and the fluctuation of a picture and eneven brightness can be prevented effectively.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an image display device using thermionic emission.

2. Description of the Related Art Structures and Problems of Conventional Examples Image display devices are generally included in cathode ray devices that utilize thermionic emission. The entire structure of this image display device 411qI&
A cathode ray 1 forming an emitter and a support 2 for supporting it are arranged on the cathode ray 1, and a mesh-like control electrode 3. Furthermore, a phosphor 4 is placed on top of it.

Further, a base electrode 6 is placed under the cathode ray 1 in order to cause the cathode ray 1 to actively emit s electrons.

However, as the size of the phosphor increases, this cathode ray 1 becomes longer and becomes more likely to vibrate. For example, if the distance between the supports 2 of the cathode rays 1 is 20 cm, the diameter is 2
Cathode ray 1 of 0 to 3o micrometers is ±2o to ±10
It vibrates about 0 micrometers. When the cathode ray 1 vibrates, its relative position with respect to the control electrode 3 changes, resulting in a disadvantage that the image may be shaken or brightness may be uneven.

OBJECTS OF THE INVENTION It is an object of the present invention to provide an image display device that eliminates the above-mentioned drawbacks and provides stable image brightness and uniform high quality images even against external vibrations and electrical vibrations.

Components of the Invention Kikinmei developed a thermal lightning-:+'ft A-diagnostic brocade, a control electrode to control the amount of snow, a phosphor that emits light in response to an electronic sound,
and a back electrode that makes it easier to emit thermoelectrons, a support that stretches the cathode ray, and an inorganic M wire that is folded in a shape that crosses the cathode ray near the fixed part of the cathode ray. Also, due to the damping effect of the inorganic thin wire, the amplitude of the cathode rays is significantly attenuated, and it has the unique effect of preventing image fluctuation and brightness unevenness.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described in detail below with reference to FIG. 1 is a conductive cathode ray coated with a substance having thermionic emission ability, such as barium oxide. Reference numeral 5 denotes a back electrode installed to facilitate the generation of all thermoelectrons from cathode rays, and is designed to form a conductive layer by vapor depositing indium on a glass substrate so that a voltage can be applied. Reference numeral 3 denotes an electrode for controlling electrons emitted from the cathode rays so as to form a predetermined image. Reference numeral 4 denotes a phosphor that emits light when electrons passing through the control electrode collide with it to display an image.

2 is a support on which the cathode rays are completely stretched.

Reference numeral 6 denotes a vibration isolation wire attached to damp the vibration of the cathode ray. The image display device configured as above will be explained in detail.0 In FIG. 2, the cathode ray 1 is connected to the support 2
It is stretched with a tension of approximately 209 degrees between. In order to ensure accurate mutual positions of the cathode rays and positions with the electrodes, the support body 2 is a frame body with a V-groove formed in the portion where the cathode rays 1 are supported. When a pulsed voltage is applied to the cathode ray 1 to cause it to emit thermoelectrons, the temperature of the cathode ray 1 changes over time, and the natural frequency of the elongated cathode ray 1 changes accordingly. Then, when the period becomes approximately equal to the pulse period, resonance occurs. In the conventional example shown in Figure 1, the cathode ray 1 is in a high vacuum, so the damping effect of the air works, and since it has no damping effect on itself, it vibrates greatly when it enters a resonance state as shown in Table 1. In the present invention, as shown in FIG. 2, a glass with a diameter of about 50 to 100 micrometers is placed at the end of the cathode ray (about 6 to 10 m from the inside of the support) where it will not cause any disturbance to the image. The fiber anti-vibration wire 6 is strung approximately perpendicularly to the cathode wire 1 as if it were sewn together. That is, the cathode ray 1 and the anti-vibration wire 6 are strung so that their upper and lower relationships change with each other, and the second anti-vibration wire 6 is symmetrical in upper and lower relationships with the first vibration-isolating wire 6. Stretch it like this.

As a result, despite being in a high vacuum, vibration isolation wire 6 and cathode ray 1
Due to the damping effect due to the phase shift between the two, the amplitude of the cathode ray 1, which was conventionally about 200 micrometers, decreased to about 20 micrometers or less even in a mutually stable state, and image fluctuation and brightness unevenness were greatly reduced. In addition, since the anti-vibration wire 6 is stretched with a light tension force of about several grams or less, the mutual parallelism between the cathode rays 1 is about 10 micrometers or less, which is not perceptible to the human eye as image distortion, and as mentioned above. Due to the anti-shake effect, very high quality images were obtained with little image shaking or brightness unevenness.

Effects of the Invention As described above, the present invention reduces the amplitude of the cathode ray by stitching an anti-vibration line to the end of the cathode ray, thereby achieving high quality images without wavering or uneven brightness.

[Brief explanation of the drawing]

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 ray, 2...Support, 3...
...Control electrode.

Claims (1)

[Claims] A cathode ray that emits thermionic electrons, a control electrode that controls the flow of thermionic electrons emitted from the cathode ray, a phosphor that can receive the thermoelectrons and emit light, and a phosphor that can easily emit the thermionic electrons from the cathode rays. An image display device comprising a back electrode, a support for stretching the cathode wire, and an anti-vibration wire made of one or more thin inorganic wires arranged so as to be sutured to each other in a direction substantially perpendicular to the cathode wire.