JPH06267427A - Aging treatment of cathode ray tube - Google Patents

Abstract

PURPOSE:To provide a cathode-ray tube having a designated emission characteristic by mending a damaged electron emitting surface of a cathode due to collision of an ionized gas. CONSTITUTION:An electronic beam is formed by controlling electronic emission from a cathode (K) and a heater (H) of an electron gun (3) and a cathode and forcusing the emitted electron. The electron beam is aging treated by applying designated voltage to a plurality of electrodes (G1)-(G6) accelerating and focusing on a phosphor screen (2) and deflecting an electron beam emitted from the electron gun and then scanning the phosphor screen (2). The aging treatment is carried out by cutting off the electron beam without stopping heating the cathode at least one time by a heater. during the aging treatment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube aging treatment method, and more particularly to an aging treatment method performed while scanning a phosphor screen.

[0002]

2. Description of the Related Art Generally, in a cathode ray tube such as a color cathode ray tube, after forming a bulb containing a phosphor screen and other various internal members, an electron gun is sealed in the neck of the bulb and the electron gun is sealed. The valve is heated and evacuated, and the cathode of the electron gun is decomposed and activated in the subsequent stage after the exhaust reaches a high vacuum inside the tube. After that, in order to absorb the residual gas in the tube and make it a higher vacuum,
The getter is flushed to form a getter film on the inner surface of the valve. Thereafter, a predetermined voltage is applied to the heater, the cathode, and a predetermined electrode of the electron gun according to a predetermined schedule, and an emission aging process for activating the cathode is performed. Then, a high voltage higher than the rated voltage is applied to the high voltage electrodes of the electron gun to perform a withstand voltage process for removing the discharge source. After that, the rated voltage is further applied to the electrodes of the heater, the cathode and the electron gun to emit an electron beam, and the electron beam is deflected by the magnetic field generated by the deflection yoke to scan the phosphor screen under actual operating conditions. It is manufactured by carrying out a raster aging treatment for stabilizing the emission characteristics of the cathode by operating at.

In the above-mentioned raster aging process, the electron beam collides not only with the phosphor screen but also with other inner pipe members such as a shadow mask arranged inside the phosphor screen, so that gas is released from the inner pipe members. Get off. Then, the released gas collides with the electron beam and is ionized. Most of the released gas and the ionized gas are adsorbed by the getter film, but part of the ionized gas moves toward the cathode and collides with the electron emission surface of the cathode to cause damage, resulting in raster aging. In the characteristic inspection performed after the processing, it is often the cause of being determined as an emission failure.

[0004]

As described above, a cathode ray tube generally has a bulb in which various internal members are built, the electron gun is sealed in the neck of the bulb and then exhausted, and then the getter flash is sequentially installed. , Emission
It is manufactured by performing aging treatment, withstand voltage treatment and raster aging treatment.

However, when a cathode ray tube is manufactured by the above method, gas is emitted from the member inside the tube due to collision of electron beams during the raster aging process, and the emitted gas collides with the electron beam to be ionized, and a part thereof is generated. Move toward the cathode and collide with the electron emission surface of the cathode to cause damage, which causes the emission failure to be determined in the characteristic inspection performed after the raster aging treatment.

The present invention has been made in order to solve the above-mentioned problems. Even if the gas ionized by the raster aging process collides with the electron emission surface of the cathode and damages it, the raster aging process is performed. The purpose is to recover the damage and to obtain an aging treatment method that does not cause emission failure in the characteristic inspection.

[0007]

A cathode of an electron gun, a heater for heating the cathode, a control of electron emission from the cathode and focusing of the emitted electrons to form an electron beam, the electron beam being used as a phosphor screen. In the aging treatment method for a cathode ray tube, which applies a predetermined voltage to each of a plurality of electrodes that are accelerated and focused on the electron beam, deflects the electron beam emitted from the electron gun, and performs aging treatment while scanning the phosphor screen, During the aging process, the electron beam was cut off at least once without stopping the heating of the cathode by the heater.

[0008]

As described above, a predetermined voltage is applied to each of the cathode, the heater and the plurality of electrodes of the electron gun, and the electron beam emitted from the electron gun is deflected to scan the phosphor screen. If the electron beam is cut off without stopping the heating of the cathode by the heater at least once during the aging process, the electron beam collides with the inner member of the tube while the electron beam is being extracted, and gas is released. , The emitted gas collides with the electron beam and is ionized, and this ionized gas collides with the electron emission surface of the cathode and causes damage,
Since the electron beam is not emitted during the cutoff state, the ionization is stopped. On the other hand, even in this cut-off state, since the cathode is heated by the heater, damage to the electron emission surface can be recovered during this period, and a cathode ray tube having a predetermined emission characteristic can be obtained.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 shows an aging treatment method which is one embodiment of the method. The cathode ray tube to be aged is a color cathode ray tube, and in the neck 1, three cathodes K, three heaters H for individually heating the cathodes K, and phosphors which are sequentially separated from the cathode K by a predetermined interval are provided. First to sixth grids G1 to G6 arranged in the direction of the screen 2
An electron gun 3 consisting of is arranged. In this electron gun 3, the second grid G2, the fourth grid G4, and the third grid G3
And the fifth grid G5 are connected in a tube, respectively, and the heater H, the cathode K, and the first to fifth grids G1 to G5 are provided with stem pins (not shown) penetrating the stem at the end of the neck 1. A predetermined voltage is applied, and the sixth grid G6
For the inner surface conductive film 6 formed on the inner surface of the funnel 4 from the anode terminal 5 provided on the large-diameter portion of the funnel 4.
And the inner conductive film 5 attached to the sixth grid G6
A predetermined high voltage is applied via a valve spacer 7 that is pressed against the.

Therefore, in this electron gun 3, the cathode K
Also, the first and second grids G1 and G2, which are sequentially adjacent to the cathode K, form an electron beam generator that controls the electron emission from the cathode K and focuses the emitted electrons to form an electron beam. , 3rd to 6th grid G3
Due to G6, an electron lens portion for accelerating and focusing the electron beam from the electron beam generating portion on the phosphor screen 2 is formed.

In the aging process, the heater H of the electron gun 3 has a heater voltage EH of 6.0 to 8.0 V, each cathode K has a cathode voltage EK of 0 to 100 V, and the first grid.
A first grid voltage Ec1 of 0V (ground) to G1, a second grid G2 and a fourth grid G4 connected to this grid, a second grid voltage Ec2 of 300 to 500V, a third grid G3, connected to this grid 6th to 5th grid G5
Focus voltage Ec3 of 9kV, 25 ~ 3 on 6th grid G6
An anode voltage Eb of 5 kV is applied, and a deflection yoke 9 is placed outside the boundary between the large diameter part of the funnel 4 and the neck 1.
And a predetermined deflection current is supplied to each of the horizontal and vertical deflection coils of the deflection yoke 9. Then, the electron beam emitted from the electron gun 3 is deflected by the application of each voltage described above, and the phosphor screen 2 is horizontally and vertically scanned to draw a raster on the phosphor screen 2, and the aging process is performed for a certain time (raster). ·aging).

Moreover, in this embodiment, FIG.
The cathode voltage Ek is shown on the vertical axis and the time t is shown on the horizontal axis. The cathode voltage Ek is raised to the cutoff state for several minutes in the final stage of the aging process, and the vertical axis shows the cathode current Ik on the horizontal axis in (b). The cathode current Ik is set to Ik = 0 mA as indicated by the axis t.

When the aging process is performed in the final stage of the raster aging process in the cut-off state for several minutes as described above, while the electron beam is being extracted from the cathode K,
The electron beam collides with the member inside the tube, and gas is emitted, and the emitted gas collides with the electron beam and is ionized, and the collision of this ionized gas causes damage to the electron emission surface of the cathode K. However, during the above-mentioned cut-off state, the ionization of the released gas is stopped, and the ionized gas does not collide with the electron emission surface of the cathode K 1. On the other hand, even during the period of this cut-off state, since the cathode K is heated by the heater, damage to the electron emission surface can be recovered during this period, and a cathode ray tube having a predetermined emission characteristic can be obtained.

In the above embodiment, the cut-off state was set for several minutes in the final stage of the raster aging treatment.
As shown in FIGS. 3 (a) and 3 (b), the cathode voltage Ek is increased to the cut-off state several times every several minutes during the aging process and at the final stage of the aging process.
Even if Ik = 0 mA, a CRT having a predetermined emission characteristic can be similarly obtained by recovering the damage on the electron emission surface.

The present invention is effective not only in the normal raster aging process described above, but also in the pre-raster aging process for partially decomposing the gas inside the tube, which is performed in the cathode ray tube.

The present invention can be applied to the aging treatment of Braun tubes other than the color Braun tube to obtain the same effect.

[0018]

EFFECT OF THE INVENTION During the aging process performed while scanning the phosphor screen by applying a predetermined voltage to each of the cathode, the heater and the plurality of electrodes of the electron gun and deflecting the electron beam emitted from the electron gun. If the electron beam is cut off without stopping the heating of the cathode by the heater at least once, the electron beam collides with the inner member of the tube during the extraction of the electron beam and gas is released. The ionized gas collides with the electron beam and is ionized, and the ionized gas collides with the electron emission surface of the cathode and causes damage.
Since the electron beam is not emitted during the cutoff state, the ionization of the emitted gas is stopped. On the other hand, even in this cut-off state, since the cathode is heated by the heater, damage to the electron emission surface can be recovered during this period, and a cathode ray tube having a predetermined emission characteristic can be stably produced. .

[Brief description of drawings]

FIG. 1 is a diagram for explaining an aging treatment method for a color cathode-ray tube according to an embodiment of the present invention.

FIG. 2A and FIG. 2B are views showing changes in cathode voltage and cathode current in aging treatment, respectively.

FIG. 3 (a) and FIG. 3 (b) are views showing changes in different cathode voltage and cathode current in the aging treatment, respectively.

[Explanation of symbols]

 2 ... Phosphor screen 3 ... Electron gun 5 ... Anode terminal 9 ... Deflection yoke G1 ... First grid G2 ... Second grid G3 ... Third grid G4 ... Fourth grid G5 ... Fifth grid G6 ... Sixth grid H ... Heater K ... Cathode

Claims (1)

[Claims] 1. A cathode of an electron gun, a heater for heating the cathode, an electron emission from the cathode is controlled, and the emitted electrons are focused to form an electron beam, and the electron beam is accelerated on a phosphor screen. A cathode ray tube aging treatment method in which a predetermined voltage is applied to each of a plurality of focusing electrodes, and an electron beam emitted from the electron gun is deflected to perform aging treatment while scanning the phosphor screen. A method for aging a Braun tube, characterized in that the electron beam is cut off without stopping the heating of the cathode by the heater at least once during the treatment.