JPS61110941A - Linear hot cathode stretching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a stretching device for a linear hot cathode in a flat cathode ray tube for displaying images and characters in televisions, display devices, and the like.

Conventional technology Conventionally, as a flat cathode ray tube, Japanese Patent Application Laid-open No. 64-143063
No. 55-33734, etc. have been proposed. These flat cathode ray tubes obtain a band-shaped electron beam using an electron source consisting of a linear hot cathode and deflection electrodes that face each other so as to sandwich the hot cathode, and apply a potential difference to the deflection electrodes to direct the electron beam in the vertical direction, for example. After that, the individual electron beams are individually modulated by horizontally divided electrodes, and then the individual electron beams are horizontally deflected by horizontal deflection electrodes, and a plurality of electron beams formed on a transparent substrate are The set of phosphors emit light at predetermined positions to display images, characters, etc. on the screen. A typical configuration of this flat cathode ray tube will be explained with reference to FIG. 3. Reference numeral 101 is a back electrode, which is formed by vacuum evaporation, sputtering, etc. on the inner surface of a metal plate or cathode ray tube envelope (not shown). A conductive film such as a metal film or a transparent conductive film is formed by the linear hot cathode 10.
The thermoelectrons generated from 2 are pushed out in a predetermined direction. The linear hot cathode 102 is made by coating a tungsten wire with a diameter of 10 to several tens of micrometers with an oxide electron emitting material to a thickness of several micrometers to several tens of micrometers. A predetermined voltage is applied to both ends of the linear hot cathode 1o2, and by heating the linear hot cathode 1o2 to 80° C., more uniform electrons are generated from the oxide cathode. 103
A control electrode is used to draw out electrons generated in the linear hot cathode 102, and a plurality of through holes 103' are provided corresponding to the linear hot cathode 102.

The shape, dimensions, and number of through-holes 103' are determined by the required number of electron beam spots, the magnitude of the Prince beam current, and the like. Reference numeral 104 denotes an electrode that deflects the electron beam in a direction perpendicular to the screen, and conductive electrodes 104 are formed on both surfaces of a substrate made of an insulating material by means of vacuum evaporation, screen printing, etc.
' is formed.

105 is a control electrode that controls the flow of the electron beam 107 (
For example, ON, OFF operation). 106 is an electrode that accelerates the electron beam 10γ. 108 is electron beam 1
07 in the horizontal direction with respect to the screen, and is configured to be electrically divided into two parts in a comb shape. 109 is an electrode that accelerates the electron beam like the electrode 106. Reference numeral 110 denotes a light-transmitting substrate made of glass. Usually, a face plate which is a part of the envelope of a cathode ray tube is used. On the vacuum side inner surface of this substrate 110, there is a phosphor layer and a metal layer made of a thin aluminum film. A light emitting section 111 composed of a back layer is formed, and a high voltage (5 to 20.KV) similar to that of the accelerating electrode 109 is applied to the metal back layer. A plurality of the linear hot cathodes 102 are arranged at predetermined intervals in the vertical direction of the screen, and the electrodes are arranged correspondingly.

As shown in FIG. 4, each linear hot cathode 102 is suspended by a spring 113 between a pair of insulating support stands 112 provided on the control electrode 103.

Such a flat cathode ray tube has a plurality of linear hot cathodes 102.
The electron beam is deflected vertically and horizontally for each block and synthesized as a single image on the light emitting unit 111.It has a simple structure, and has a large screen, high brightness, and high resolution. The feature is that a thin display device can be obtained.

Problems to be Solved by the Invention However, as described above, the linear hot cathode 102 is connected to the spring 11.
When strung using 3, the length of the filament becomes longer and the string becomes fixed at both ends.

The linear hot cathode 10 is activated by external vibration or electric trigger.
2 vibrates, resulting in flickering on the screen. In order to solve such problems, conventionally, in fluorescent display tubes and the like, the linear hot cathode 102 has been installed by increasing the tensile strength, or by adding mica or metal in the middle of the stretched linear hot cathode 102. Some measures have been adopted to support this. However, in flat cathode ray tubes, if the above method is adopted, the oxide cathode coated on the surface of the linear hot cathode will be damaged due to expansion and contraction when the linear hot cathode 102 is heated, resulting in loss of thermoelectrons. This cannot be used because it causes the generation of uniform parts and the generation of stray emissions due to redeposition of the scraped oxide cathode.

Therefore, the present invention can prevent mechanical vibration of a linear hot cathode used as an electron source in a flat cathode ray tube, etc., and can also prevent screen flickering.

It is an object of the present invention to provide a stretching device for a linear hot cathode in which the influence of the elongation of the base material when heating the linear hot cathode can be ignored.

Means for solving the problems and technical means of the present invention for solving the above problems are as follows:
It is fixed to the control electrode and fixes the linear hot cathode in an insulated state,
A support base in which the linear hot cathode corresponds to the electron beam passage hole of the control electrode, and a support for the linear hot cathode on both sides of the linear hot cathode,
A pair of weighting members supported so as to be movable toward and away from each other and each having a plurality of weighting pieces that alternately press the middle part of a linear hot cathode from opposite sides, and each weighting member is applied to the linear hot cathode. It is equipped with a biasing means for biasing in the direction of

Operation The present invention can prevent mechanical vibration of the linear hot cathode with the above-described configuration. By heating the linear hot cathode, electrons are generated from the linear hot cathode, and the electron beam can be extracted from the electron beam passage hole. At this time, even if the linear hot cathode expands, the weighting pieces of the weighting member are applied from alternately opposite sides to prevent it from loosening, and the contact portions of the weighting pieces with the linear hot cathode are set at the same point to prevent the linear hot cathode from loosening. Necessary damage can be prevented, and the relative position between the linear hot cathode and the electron beam passage hole can be kept unchanged.

Embodiment One embodiment of the present invention will be described in detail below with reference to the drawings. As shown in FIGS. 1 and 2B, electron beam passing holes 2 of a predetermined size and number are arranged in a row in a control electrode 1. Insulating support stands 3.3 are fixed to opposite sides of the control electrode 1 by means such as welding or gluing. Both ends of the linear hot cathode 4 are fixed to the supports 3, 3 by means such as welding. The support base 3 is formed of a metal or insulating material that is electrically insulated from the linear hot cathode 4, and the linear hot cathode 4 has an oxide cathode on a metal wire such as tungsten having a diameter of about 15 to 50 μm. 5-20
It is applied to a thickness of about μm. Weighting members 5 and 6 are provided on both sides of the linear hot cathode 4 along the axis of the linear hot cathode 4 . This weighting member 6.6 is made of metal or an insulating material, and is moved toward and away from the linear hot cathode 4 by means of guide members 7 that are electrically insulated and attached to both sides of the control electrode 1. It is supported so that it can move in the direction. Each weighting member 6.6 has a plurality of weighting pieces 8.9 protruding from the inside in a comb-like shape. The weighting pieces 8 and 9 on both sides are alternately spaced at approximately equal intervals. The electron beam passage hole 2 is also disposed in a shifted position in the middle of the electron beam passage hole 2. These weight members 5
．． Spring 1o, which is a biasing member, is connected between both sides of 60, sandwiching the linear hot cathode 4, and each weighting piece 8.9 is brought into contact with the linear hot cathode 4. 4 is weighted.

Next, the operation of the above embodiment will be explained. Since both ends of the linear hot cathode 4 are fixed as described above, its mechanical vibration can be prevented, and in this state, a predetermined voltage is applied to both ends of the linear hot cathode 4 to generate a linear heat source. Cathode 4 600-80
By heating to 0° C., electrons are generated, and an electron beam can be extracted from the hole 2. At this time, the linear hot cathode 4
Since the portion where the weighting pieces 8 and 9 of the weighting member 5.6 come into contact with is other than the electron beam passage hole 2 provided in the control electrode 1, that is, between the passage holes 2 and 2, the linear hot cathode 4 The effect of a decrease in electron emission due to a decrease in temperature due to contact with the substrate can be almost ignored. Therefore, the linear hot cathode 4 has a linear expansion coefficient (tungsten = 6X 1o-"m/℃
).

As mentioned above, the weighting pieces 8 of the weighting member 6.6 are alternately applied from both sides.
．． 9, the linear hot cathode 4 is
From the state shown in the figure, the zigzag shape shown in Fig. 2B,
Never relax. At this time, the linear hot cathode 4 is loaded with a weighting member 6.
The portions in contact with the weighting pieces 8.9 of 6 are the same point, regardless of the expansion and contraction of the linear hot cathode 4, so that the oxide cathode of the linear hot cathode 4 is not unnecessarily damaged. Further, since the linear hot cathode 4 is deformed in a zigzag manner so as to rotate around the center of the electron beam passage hole 2 of the control electrode 1, the mutual positions thereof can also be maintained in the initial state.

Note that the weighting members 5 and 6 that weight the linear hot cathode 4 are made of a metal material by photo-etching or the like, and only the contact portion of the comb-shaped weighting piece 8.9 that contacts the linear hot cathode 4 is or entirely insulating material (e.g. %5in2.k120
．． etc.) may be coated. Also weighted member 6.6
may be made of a metal material, electrically separated between both weighting members 6.6, and heating power for the linear hot cathode 4 may be supplied to these weighting members 5.6. According to
Since electric power can be supplied by cutting the linear hot cathode 4 into small pieces, problems such as potential differences occurring due to the temperature distribution of the linear hot cathode 4 and its own resistance can be solved. Also, at this time, it is not necessary to supply power from all the weight pieces 8.9, and some of the weight pieces 8.9 may be made insulative and energized from some of the weight pieces 8.9. .

Effects of the Invention As is clear from the above explanation, according to the present invention, both ends of the linear hot cathode are fixed in an insulated state to a support fixed to the control electrode, and the linear hot cathode is connected to the electron beam passage hole of the control electrode. Corresponding to this, the intermediate portion of the linear hot cathode is alternately pressed by a plurality of weighting pieces provided on a pair of weighting members, thereby urging both weighting members in the suppressing direction.

Therefore, it is possible to prevent the linear hot cathode from mechanically vibrating, and it is possible to prevent one screen from flickering. Furthermore, even when the linear hot cathode is heated, its linear expansion is absorbed by the weight member that biases it, resulting in a change in the relative position between the linear hot cathode and the electron beam aperture provided in the control electrode. In addition, since there is no movement of the contact point of the weight member with respect to the linear hot cathode, it is possible to prevent scratches and maintain stable operation over a long period of time, which improves the progress of Go playing. The problems caused by this can be solved.

[Brief explanation of the drawing]

Fig. 1 is a partial perspective view showing an embodiment of the linear hot cathode stretching device of the present invention, Figs. 2 and B are plan views for explaining the operation of the present invention, and Fig. 3 is a conventional A perspective view showing the electrode configuration of a flat cathode ray tube, and FIG. 4 is a partial perspective view showing a conventional stretching device for a linear hot cathode. DESCRIPTION OF SYMBOLS 1... Control electrode, 2... Electron beam passing hole, 3... Support stand, 4... Line hot cathode, 5.6... ... Weighting member, 7 ... Guide member, 8.9 ... Weighting piece, 1° ... Spring (biasing means) Agent's name Patent attorney Nakao Toshio and 1 other WJ
Figure 1 Figure 2 AI Figure 3 Figure 4

Claims (5)

[Claims] (1) A support base fixed to the control electrode, with both ends of the linear hot cathode fixed in an insulated state, and with the linear hot cathode corresponding to the electron beam passage hole of the control electrode, and a support base on both sides of the linear hot cathode. A pair of weighting members each having a plurality of weighting pieces supported so as to be movable toward and away from the linear hot cathode and alternately pressing the middle portion of the linear hot cathode from opposite sides; A stretching device for a linear hot cathode, comprising a biasing means for biasing the linear hot cathode in a direction that applies a load to the linear hot cathode. (2) The linear hot cathode stretching device according to claim 1, wherein the weighting pieces of the pair of weighting members are arranged at approximately equal intervals. (3) Claim 1 in which the weighting member is electrically insulating.
A stretching device for a linear hot cathode as described in 2. (4) The linear heat according to claim 1, wherein both weight members have conductivity, are electrically isolated from each other, and can supply heating power to the linear hot cathode. Cathode stretching device. (5) The linear hot cathode stretching device according to claim 1, wherein the weighting piece of each weighting member is arranged at an intermediate portion of the plurality of electron beam passing holes in the control electrode.