JPS59177834A - High voltage treatment of cathode-ray tube - Google Patents

Abstract

PURPOSE:To prevent any bulb cracks, clean the electrode sufficiently and realize the high reliability of a cathode-ray tube by placing an electromagnet outside the bulb and beside an electron gun and exciting the electromagnet by a changing current during the application of high voltage to the electron gun. CONSTITUTION:Electrons discharged from an electron gun 3 are shifted from the center of the bulb of a cathode-ray tube by feeding a current to a neck section 1b located outside an electron gun 3. An excitation power source 12 is connected to the electromagnet 11 which is excited, for example, so that an electron beam discharged from the electron gun 3 during the time when an output is delivered from a high voltage source 10 scans an area apart from a face section 1a. Owing to the above constitution, no deterioration of a fluorescent film 3 is caused and the electron beam is not concentrated on one spot on the inner surface of the bulb especially on the inner surface of the neck tube. As a result, any cracks which might be caused due to the phenomenon that the thermal strain of the bulb caused by its temperature change is concentrated on scars formed due to the concentration of the electron beam, can be prevented.

Description

[Detailed description of the invention] Technical field The present invention relates to a high-pressure processing method for cathode ray tubes.

BACKGROUND ART FIG. 1 shows an example of a cathode ray lamp, in which 1 is a bulb, a face with a fluorescent film 2 facing inward, and
A neck VA (t b =funnel sound) in which the entire electron gun 3 for supplying the entire electron beam to the fluorescent film 2 is housed. 4 anode buttons hermetically penetrate through the funnel portion lci; 5 an internal conductive film electrically connected to the anode button 4 on the inner surface of the funnel portion 1C and formed in the inner peripheral direction at the tip of the neck portion 1b; 6 an internal conductive film 5; Partially combined fluorescent film 2 VC product Nl 1. 7 is a metal back layer formed on the outer circumferential surface of the funnel IC except for the anode button 4. Although the electron gun 3 is not shown, it is made up of a plurality of electrodes all arranged in a straight line at predetermined intervals. A support spring 8 is led out from the leading electric shock, and the interior conductive film 5
By elastically pressing the neck part 1bi through the neck part 1bi, Hiroko's gun tip part is fully supported, and a high voltage (7 nodes) supplied from outside the valve 1 is applied to the leading electrode through the anode button 4 and the circular relay membrane 5. voltage) is fully supplied. Although other electrodes of the electron gun are not shown, they are located at the neck end 1b'? ! : It is connected to a lead that penetrates the air bud, and fully supports the rear part of the electron gun, and all the leads are valved to apply all predetermined voltages and signals to the other electrodes.

During manufacture, this cathode 7-tube tube is manufactured by applying a full pulsed voltage between the electrodes of the electron gun 3, which may cause damage to the electrode, contamination of the electrode, foreign matter, or local discharge caused by electrode molding. Removal 1-1 Same as 1st electrode σ) All I~ to increase pressure and increase reliability Q) Same as above.

By the way, in the case of a projection type in which the image of the phosphor film 2 is projected onto a screen using all lenses etc., the brightness on the screen is inversely proportional to the magnification. Therefore, in order to keep the screen completely bright, it is necessary to keep the phosphor film 2" much brighter than the cathode 4X film used for ordinary television broadcast reception.

Therefore, in this type of cathode, l, lil tube, the full undo pressure of about 35 KV is applied, and the tenacity r, ν1! However, in order to achieve sufficiently stable operation at such a voltage, the voltage must be twice the normal operating voltage, that is, 60 to 70 KV.
A certain amount of voltage is applied between all three electrodes of the electron gun to complete the voltage processing.

During the treatment of C, electron emission due to field emission or tri
In fact, the ions generated by the secondary discharge due to intermittent discharge completely destroy the fluorescent film 2 per 2 VC of the fluorescent film.

Therefore, as shown in FIG. 2, a permanent magnet 9 is placed in the neck portion 1b to the funnel portion 1clA so that the ions generated during voltage treatment are applied to the inner surface of the bulb 1 that has come off the fluorescent film 2. ing. In the figure, reference numeral 10 indicates a sub-voltage which is supplied to the electron gun 3 and which generates a total voltage.

However, as the applied voltage increases, the generated electron beams and ions concentrate at one point inward of the bulb, causing damage to the bulb glass. There was a problem that when the tube was exposed to stress such as thermal expansion or contraction, it would crack and break at the 1st part.

In addition, if a full electric discharge occurs during this σJ pressure treatment, the potential between the other electrodes will drop, causing the IJT during production! First, the electrodes were not sufficiently cleaned within the specified time, and discharge noise was sometimes produced during operation.

DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned problems by proposing ν≦, completely prevents valve cracks, completely cleans the electric hood, and has good reliability σ]
Cathode ray tubes can be obtained by providing a full range of voltage processing methods.

In the present invention, the bulb glass e (-the fluorescent film VC is fully formed and the fluorescent film VC is fully supplied with electron beam 1) a voltage is applied between the electron gun electrodes of the cathode ray tube which is fully housed) is processed by MI. In the VC, all the electromagnets are placed outside the valve on the side of the electron gun, and the electromagnet is placed in the electron gun.
It is made to be energized by a magnet that changes during the application period of the earth/here and all features.

With the above configuration, the present invention has the following effects: 0 1 - Ions generated by electron emission by field radiation VC or secondary Kameko radiation? Firefly C membrane? The amount of electrons is not concentrated in one direction, and all the electrons are not concentrated at one point on the bulb.Is there any damage to the fluorescent film and bulb? You can prevent damage without having to attach it.

z er, all the beam electrons generated within 10E h1. It can be applied to other electrodes, ensuring gas release, cleaning, and removal of foreign substances from the electrode, and sufficient treatment can be performed with a short poem 1 or 11.

The longest form for the invention British wrt-i, ■, below the throat,
An embodiment of the present invention will be explained from FIG. 3 and FIG. 41.

In FIG. 8, the same reference numerals as those in FIG. 1 and Section 2 refer to the same parts, and the explanation thereof will be omitted. In the figure, 11 is ■The neck t on the outside of the engineering gun 3
fli l b) 'J Rei Fuun Furu Part 1C was inserted? Electron gun 3 by passing through h electromagnet and electric wire
From the center of all the electronic valves that generated sword 1! Shift it toward P1j. 12 is an excitation #4 power supply connected to the electromagnet 11, for example, the fourth power supply is synchronized with the output of the voltage source 10 as shown in c, and is emitted from the electron gun 3 at the time of output 1 of the energized source 1o. 4 masonry 1 is fully excited so that the electron beam scans all the areas away from face t%] and a.In other words, the output of the excitation power source 12 is still the voltage pulse PL, P2.P3.
Pulse PL of P4, P2 and P3. Pulse PI is a sawtooth wave whose potential becomes ○ in the middle of P4.

'P2 When generated, electron [stock] 1] 3 releases σ
T-beam 〃) Range 1 that scans the entire face part la
'l-I Q, r, is a voltage value with a large absolute value.

In this operation, first, the excitation power supply 12i is operated and the electromagnet 1
1 Fully excited. Then operate the voltage source as 0 and perform electronic operations.
3σ) 'P1i; Apply voltage 7Jll to the peak. ``Streetcar)'':, disappearance ioi; + continuous action or for example Q, 5
1 move of seconds y, ko-- Hold several times with a 5-second pause Okoσ) During the pause period, 1JJJJ magnetic power supply 1.2'' (- You may pause or make it continuous side 1' .

(difficult) If a discharge occurs between the electrodes of the electronic mirror 3 during operation, '
If electrons become electrons, can they be emitted as ions? However, the magnetic field caused by the excitation (12V power supply for 4 (thus, the excited electromagnet)) is deflected from the entire electronic face part 1a to the part 1a, and is scanned, causing damage to the fluorescent light 2. Since the electron beam is not concentrated on a single point on the bulb's circular surface, especially on the inner surface of the ink tube, the thermal distortion caused by the ILV activation of the bulb is easily caused by the electron heat A (1). This prevents the occurrence of cranks concentrated on the engine.

In addition, since the -1000-Heem is used in the Hiroshima gun circle, it is possible to apply the generated electron beam to the rough object, and the degassing, cleaning, and foreign matter removal of the electron beam is unsuccessful and short-lived. The process can be done in enough time.

Therefore, if the voltage resistance can be improved, the phase change's shadow protection can be fully realized.

Incidentally, the invention is not limited to the above-mentioned embodiments, and the invention is not limited to the above-mentioned embodiment.
．． It can also be used for 4-meter weir bamboo that moves under pressure.

In addition, the output wave of the excitation power supply] [ji is shown in Figure 4] (instead of the output wave, it may be a sawtooth wave as shown in Figure 5, or it can be a sawtooth wave as shown in Figure 5)
It may also be a sine wave as shown in .

[Brief explanation of the drawing]

Figure 1 is a side cross section showing an example of the cathode-g;
Figure 3 shows the method of pressure treatment of the inventive lineman! Figure 4 is a diagram of the voltage -πjj and the output waveform of the excitation power supply, Figures 5 and 61 are the excitation m
1Mav different output waveform diagrams are all shown. 1--Bulb, 2 Fluorescent film, 3 Electronic mirror, ], □ lvl voltage source, 11, Electromagnet, 12 Excitation streetcar. Figure C]

Claims (1)

[Claims] In a method in which a fluorescent film is completely formed on the inner surface of the bulb, and the fluorescent film is flooded with electron beams, using a cathode ray tube housing a cathode ray tube with a fully housed electron gun. , the electron gun t (all electromagnets are placed outside the valve on the d side, and the voltage is applied to the electron gun) is excited by a current that changes during the J period A. -Pressure treatment method.