JPH03225724A - Treating of cathode-ray tube - Google Patents

Abstract

PURPOSE:To considerably reduce gas molecule emission from the inside of metal, an electrode material, by measuring cathode activity with alternating voltage applied to one side of an acceleration electrode and a focus electrode. CONSTITUTION:A cathode body structure 1 and a bias electrode 3 are made to have the same electric potential at a negative electrode, an acceleration electrode 4 and a focus electrode 5 on a counter electrode side are made to have the same electric potential at a positive electrode, and A.C. voltage from an alternating power source 8 is applied between both the electrodes. The circuit itself of a cathode-ray tube becomes a rectification circuit by a vacuum tube and a half-wave in a positive direction to correctly flow an electron. In this case, applied voltage is decided by the peak position of a sine wave and mean current becomes 1/2, therefore the applied voltage, that is a peak value, can be increased to treat a cathode ray tube. The applying of a degassing treatment, from an electrode by a cathode activity measuring method using such an emission aging method, considerably reduces gas molecule emission from the inside of metal, an electrode material, due to an electron impact at the time of cathod activity measuring.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to a cathode ray tube aging and cathode efficiency measurement processing method effective for improving emission characteristics.

Conventional Hikiki 1 Generally, in the manufacturing process of cathode ray tubes, the inside of the tube is evacuated, and then an aging treatment is performed to stabilize the electron emission characteristics, and then the cathode efficiency is measured. For example, the conventional aging circuit shown in FIG. 3 and the circuit configuration for measuring the cathode efficiency of a conventional cathode ray tube shown in FIG. 4 are used.

In the figure, 1 is a cathode assembly having a sleeve serving as a cathode, 2 is a heater housed in the sleeve of the cathode assembly 1, 3 is a bias electrode, 4 is an acceleration electrode, and 5 is a focus electrode.

The emission aging circuit configuration shown in FIG. 3 includes a cathode structure 1 and a bias electrode 3 having the same potential as negative electrodes, and an accelerating electrode 4 and a focus electrode 5 as positive electrodes, and a 200V to 300V DC power supply 6 connected to these electrodes. , the structure is such that electrons are emitted from the negative electrode to the positive electrode.

Further, in the cathode efficiency measuring circuit configuration shown in FIG. 4, the cathode structure 1 and the bias electrode 3 are made negative electrodes at the same potential.

It is composed of a DC measurement power source 7 connected to the acceleration electrode 4 and the focus electrode 5 as positive electrodes, and has a structure in which electrons are emitted from the negative electrode to the positive electrode.

When measuring the cathode efficiency, when the DC power supply 7 applies a potential of -9OV to the bias electrode 3, the acceleration electrode 4 and the focus electrode 5 are set to 3 to cut off the electron emission.
It has a structure that can be set arbitrarily in the range of 00V to 600V.

B'i By the way, in the aging circuit of FIG. 3, the accelerating electrode 4.
The focus electrode 5 is set to have an appropriate voltage of 200v to 300v, which is lower than the voltage at the time of emission measurement. For example, when measuring the cathode efficiency of the cathode 1 using the circuit shown in FIG. Gas molecules are released from inside and are ionized, thereby contaminating (ion bombarding) the cathode. Therefore, the cathode causes an emission slump phenomenon, which significantly reduces the reliability of measurement data.

In order to solve this problem, it was necessary to improve gas release during aging or measurement.

In order to solve the above-mentioned problems, this invention No. 1 is a cathode ray tube processing method that includes an improvement in the power supply method in aging and cathode efficiency measurement processing, and in which the voltage application to the electrodes is applied by periodically changing voltage application such as a pulse method. It is characterized by controlling the current by voltage and reducing and maintaining the average current.

That is, the present invention provides a method for measuring cathode efficiency of a cathode ray tube including a cathode structure, a bias electrode, an accelerating electrode, and a focus electrode, in which an alternating voltage equal to or higher than a cutoff voltage is applied to the bias electrode.

Alternatively, the present invention provides a processing method for aging a cathode ray tube and measuring cathode efficiency, which is characterized by applying alternating voltages to an accelerating electrode and a focus electrode.

According to the above configuration, when aging a cathode ray tube or measuring cathode efficiency, by alternating the electron impact on the accelerating electrode and the focus electrode, heating of the electrode is reduced and gas generation from the electrode material is significantly reduced. This reduces the risk of reducing the reliability of measurement data.

In other words, the applied voltage can be set high during aging of the cathode ray tube, and sufficient gas can be vented during the aging process. In addition, the electron emission during the aging process, ie, the average current value from the cathode, can be maintained at an appropriate level.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the cathode Li arc retarding method according to the present invention will be described with reference to the drawings.

FIG. 1 shows a circuit configuration diagram used in the aging processing method according to the present invention, and FIG. 2 shows a circuit configuration diagram used in the cathode efficiency measurement processing method.

FIG. 1(a) shows a circuit configuration diagram used in the aging method of the present invention.

In the figure, 8 is a circuit configuration having an alternating voltage power source. Here, since the other circuit components are the same as those in FIG. 3, the same parts are given the same reference numerals and the explanation thereof will be omitted.

According to the above configuration, the cathode structure 1 and the bias electrode 3 are set to the same potential as negative electrodes, the acceleration electrode 4 and the focus electrode 5 on the opposing electrode side are set to the same potential as positive electrodes, and the alternating current power source 8 is connected between these two electrodes.
Apply an alternating voltage from The cathode ray tube circuit itself is a rectifier circuit using a vacuum tube, which generates a half wave in the positive direction, and electrons flow to the positive electrode. In this case, the applied voltage is determined by the peak value of the sine wave, and the average current is 1/2, so processing can be performed by further increasing the applied voltage, that is, the peak value.

Although the above embodiments used alternating current as the alternating current power supply, in all cases, the applied voltage of half-wave or full-wave pulsating current and pulse waveform as shown in FIG. 5(a), (b), and (c) was It may also be used as

FIG. 1(b) is a connection diagram of another embodiment of the present invention.

In this embodiment, the connection to the focus electrode 5 is the same as in the first embodiment, and the same DC power source as the conventional one is used for the connection circuit to the acceleration electrode 4. Here again, the same parts are given the same reference numerals and their explanation will be omitted.

In this embodiment, the potential of the accelerating electrode 4 can be maintained as in the conventional case, and the electron emission from the cathode structure can be continued, so that the voltage application to the focus electrode 5 is performed by the alternating current power supply 8, but the gas during the process is Since the voltage can be set to the desired voltage for output, it can be implemented without any limitations.

Although the above embodiment uses an alternating current as an alternating current power supply, it is the same as the first embodiment, and both of them are similar to those shown in FIGS.
) A half-wave or full-wave pulsating current and an applied voltage with a pulse waveform may be used as the alternating current power supply.

In the circuit configuration of FIG. 2(a) related to the cathode efficiency measurement processing method, 8 indicates an alternating voltage power source, and the other circuit portions are the same as those in FIG. 4, and their explanation will be omitted.

According to the above configuration, the cathode structure 1 and the bias electrode 3 are negative electrodes and have the same potential, and the acceleration electrode 4 and the focus electrode 5 on the opposing electrode side are positive electrodes and have the same potential.

In this state, the maximum anode current flows, and here, in order to control the current, a voltage higher than the cutoff voltage is alternately applied to the bias electrode 3 in a pulse waveform to control electron emission.

The alternating pulse waveform has a duty cycle of 1/2.
Measurement is performed by selecting a value in the range of 1/20 to 1/20, and the maximum anode current at the time of measurement is calculated by multiplying the average current value by the denominator of the duty cycle.

FIG. 2(b) is a connection diagram of another embodiment of the present invention.

In this embodiment, alternating voltages are applied to the accelerating electrode 4 and the focus electrode 5 in contrast to the previous embodiment.

Voltage application is performed using an alternating power supply 8, and is 300V to 600V.
The voltage and OV are alternately set arbitrarily within the range of . The alternating waveforms are the same as in the previous embodiment.

In the above embodiment, the accelerating electrodes 4 and the focus electrodes 5 are alternated, but only the accelerating electrodes may be alternated as shown in FIG. 2(C).

As shown in the above-mentioned examples, the emission aging method and the cathode efficiency measurement method of the present invention are used to perform a gas release process from the electrode, which results in an electrode material that is affected by electron bombardment during cathode efficiency measurement. The release of gas molecules from inside the metal can be significantly reduced.

It also has great practical value, such as being able to perform accurate measurements without causing emissions slump symptoms.

[Brief explanation of drawings]

FIGS. 1(a) and (b) are circuit configuration diagrams used in the cathode ray tube aging treatment method according to the present invention, and FIG. 2(a) is
(b) and (c) are circuit diagrams similarly used in the cathode efficiency measurement method, Figure 3 is a conventional aging circuit diagram, Figure 4 is a conventional measurement circuit diagram, and Figure 5 is a different modification of the alternating current power supply. FIG. 3 is an example waveform diagram. DESCRIPTION OF SYMBOLS 1...Cathode structure, 2...Heater, 3...Bias electrode, 4...Acceleration electrode, 5...Focus electrode, 6 ...DC power supply, 7...Measurement electrodeposition for accelerating electrode 5.8...
Police box power supply. Fig. 1 (a) (b) 1--Force y-Douce 4-- #Press 2--"Heater 5--- -y; r4y base 4re pivot 3-
・Heias Tan et al. 3 8--1 Shiryo 4L2゜2nd
Figure (a) Figure 2 (b) Figure 2 (c)

Claims (2)

[Claims] (1) In a cathode ray tube comprising a cathode structure, a bias electrode, an acceleration electrode, and a focus electrode, a cathode ray tube process characterized in that cathode efficiency is measured by applying an alternating voltage to at least one of the acceleration electrode and the focus electrode. Method. (2) A cathode ray tube processing method comprising aging a cathode ray tube comprising a cathode structure, a bias electrode, an acceleration electrode, and a focus electrode by applying an alternating voltage to at least one of the acceleration electrode and the focus electrode.