JPH10199425A - Manufacture of cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively perform main knocking between an anode electrode and an intermediate electrode in a cathode-ray tube formed so as to supply high voltage to the intermediate electrode through a high resistance of a internal divided resistance from the anode electrode. SOLUTION: An anode electrode where an internal divided resistance IMR is connected to one end and an intermediate electrode GM to which high voltage is supplied through the internal divided resistance IMR, are provided, and high voltage having a AC plus or minus output waveform is applied between an anode electrode G6 and an IMR pin 2, and stem pins of the other all electrodes G1 to G5 except for the electrodes G6 and GM are lowered to grounding electric potential, and the all stem pins containing the IMR pin 2 are immersed in insulating oil 3, and main knocking is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a cathode ray tube, and more particularly to an improvement in a knocking step in a process for manufacturing a cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, in a process of manufacturing a color CRT, a knocking process which does not generate a discharge during operation through a burr of an electrode of an electron gun incorporated in a neck portion of the CRT is shown in FIG. In the process near the completion of the CRT.

As shown in the CRT manufacturing process diagram of FIG. 4, carbon stripes and phosphor stripes of R (red), G (green), and B (blue) are formed on the inner surface of a glass panel, and a color selection electrode is incorporated. is carbon coated on the panel and the neck, to melt the frit and the funnel was frit applied to the funnel end surface in a first step ST _1, and crystallized, to secure the joint surfaces.

[0004] The electron gun assembly of the plurality of electrodes in a bead glass in the next second step ST ₂ the funnel neck is fixed to the stem glass, sealed in the neck.

At the time of such sealing, a stem glass with an exhaust pipe is welded to the end face of the glass neck via a burner or the like.
Electrodes of the electron gun, particularly near the neck opening, are oxidized.

[0006] Such oxidized, fourth baking treatment as shown in step ST ₄ is performed the surface of the electrodes in order to redox.

If the baking treatment is not performed as described above, the O ₂ gas released from the oxidized electrodes in actual operation combines with the oxide (oxide) applied to the cathode of the electron gun to deteriorate the emission characteristics.

[0008] The fifth step ST ₅ the getter after such a baking treatment by high-frequency heating from the funnel outside, performs a getter flash process to improve the degree of vacuum tube by depositing barium.

[0009] The carbon coating is carried out in the funnel outer surface with a reinforcing treatment for the next sixth step ST ₆ the implosion prevention is applied to the panel or panel periphery, thereby constituting a high-voltage smoothing circuit capacitor.

[0010] the following, the process of the seventh step ST ₇ the knocking and aging is performed. In this knocking process, a high voltage is applied to the electron gun to prevent discharge from occurring at the electrodes during normal operation, and an aging process is performed to emit electrons from the cathode.

Hereinafter, a conventional knocking process will be described.
FIG. 5 shows an electrode arrangement of an example of an electron gun of a three-gun type color CRT 1, in which cathodes including heaters H for R, G, and B, and K have a three-gun configuration and are arranged in-line. The first electrodes G ₁ ,
The second electrode G ₂ , the second third electrode G _3V , the first third electrode G
_3C , a fourth electrode G ₄ , a first fifth electrode G _5C , a second fifth electrode (focus electrode) G _5V , an intermediate electrode G _M , and a sixth electrode G
₆ are sequentially arranged, and the first to sixth electrodes G _{1 to} G ₆ are provided with electron beam passage holes (not shown) through which R, G, and B electron beams pass.

The same potential is applied to the second electrode G ₂ and the fourth electrode G ₄ , the second third electrode G _3V and the second fifth electrode G _5V are commonly connected, and a voltage of about 7 kV is applied. , The first third electrode G _3C and the first fifth electrode G _5C are commonly connected, and a common voltage is applied.

The sixth electrode G ₆ is connected via an anode button to 27 k
V anode voltage is supplied. The intermediate electrode G _M, the internal dividing resistor IMR, voltage and the anode voltage is resistance R ₁ by 42% down (e.g. 14 kV) is supplied, further remaining 58% by the resistance R ₂ of the internal dividing resistor IMR
IMR placed on the stem terminal at the neck end
Connected to pin 2. This IMR is obtained, for example, by printing resistance patterns R ₁ and R ₂ on a ceramic substrate.

In the electron gun 1 having the above-described electrode structure,
When performing the normal knocking process, the first knocking process is performed as shown in FIG.
The electrode G ₁ , the second electrode G ₂ , the first and second third electrodes G _3C
, G _3V , the fourth electrode G ₄ , the first and second fifth electrodes G _5C
And knocking voltage A stem pins of G _5V commonly connected
CK-65 kV is applied to drop the sixth electrode G ₆ , that is, the anode button, to the ground potential.

[0015]

As described above, the voltage applied to each electrode in the conventional main knocking process is considered to be the sixth electrode G to which the anode voltage is applied, considering the electron gun 1 having the configuration shown in FIG. ₆ and by applying a knocking voltage ACK = -60kV between intermediate electrode G _M, the discharge to cause a, but the production time must made from the intermediate electrode G _M so as not to release an unnecessary electron, electron gun 1 of FIG. 4 because forms a divided voltage obtained by dividing the high voltage from the anode of a high-resistance R ₁ and R ₂ IMR so as to supply to the intermediate electrode G _M, the voltage of the knocking voltage ACK to be applied to the knocking resistance R ₁ And R ₂ .

In the conventional main knocking process, the resistance division ratio R ₁ / R ₂ of the IMR is 42% / 58%,
Since the application of the knocking voltage ACK = -65kV from pin 2 side, dividing ratio of the resistors is the case between the sixth electrode G ₆ and between the intermediate electrode G _M <intermediate electrode G _M and IMR pin 2, IM
R pins 2 and towards between the intermediate electrode G _M is not generated a discharge between the sixth electrode G ₆ and the intermediate electrode G intermediate electrode for a high voltage from among _M G _M and the sixth electrode G _6.

The unwanted electrons from the intermediate electrode G _M side during production is between the sixth electrode G ₆ and the intermediate electrode G _M to which a high voltage be subjected to a knocking process in this manner is applied is frequently, CRT
There is a problem of deteriorating the withstand voltage characteristics of the device.

An object of the present invention is to provide a method of manufacturing a CRT which solves the above-mentioned problems, and an object of the present invention is to arrange a CRT adjacent to a sixth electrode G ₆ to which an anode voltage is applied. internal dividing resistor to the intermediate electrode G _M which is (IM
Even if the CRT has an electron gun structure connected via R), an appropriate knocking voltage is applied and the sixth electrode G ₆
And to scatter the burrs by generating discharge between the intermediate electrode G _M, even if a high voltage is applied to the normal働時is obtained form so as not to cause a discharge.

[0019]

CRT method of manufacturing of the problem-solving means for the invention, as an example of which is shown in Figure 1, between the focus electrode G _5V and G _5C and the anode electrode G ₆ of the cathode ray tube through the internal dividing resistor IMR the intermediate electrode G _M arranged so as to be lower than the higher anode voltage than focus voltage potential method for manufacturing a cathode ray tube forms so as to supply a high voltage from the anode electrode G ₆ a is, all pre-focus and focus electrode G ₁ to G ₅ side stem pins of the cathode ray tube and a ground potential, alternating between stem pin 2 to which one end and the one end of the internal dividing resistor IMR anode electrode G ₆ is connected Knocking is performed by applying a high voltage and immersing all stem pins with insulating oil 3.

According to the knocking treatment of the CRT of the present invention, the knocking is performed between the intermediate electrode G _M and the sixth electrode (anode electrode) G ₆ , and the burrs of the electrodes can be effectively eliminated.
An RT manufacturing method is obtained.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a method of manufacturing a CRT according to the present invention will be described in detail with reference to FIGS. FIG. 1 is an explanatory diagram of main knocking of the present invention, FIG. 2 is a configuration diagram of a color CRT of the present invention, and FIG. 3 is a knocking output waveform diagram.

Before describing the electrode structure of the electron gun used in the CRT of the present invention with reference to FIG. 1, the overall structure of the color CRT of the present invention will be described with reference to FIG.

In FIG. 2, the cathode ray tube 6 constituting the CRT 4 is shown.
The R, G, and B fluorescent screens 5 are formed on the inner surface of the panel, and a color selection electrode (shadow mask or aperture grill) (not shown) is provided on the inner surface of the panel. Further, the funnel portion of the cathode ray tube body 6 is an anode button 8 is disposed, inside the carbon film 12 is applied to the inner surface of the funnel portion, the sixth electrode G ₆ is an anode electrode via an internal carbon film 12 An anode voltage (27 kV) is supplied.

Further, a plurality of electrodes G _{1 to} G described in detail in FIG.
_The electron gun 1 is formed in the neck portion by integrating the electron gun ₆ through a bead glass, and the electron gun 1 is erected on a stem glass 11 for sealing an open end of the neck portion. Stem pins corresponding to the electrodes G _{1 to} G ₆ of the electron gun 1 are planted on the stem glass. 2 is an IM connected to one end of the IMR
Indicates the R pin. Reference numeral 7 denotes a deflection yoke which converges the R, G, and B electron beams B _R , B _G , and B _B converged by the electron gun 1 on the phosphor screen 5 to form a predetermined spot.

In this example, at the time of main knocking, the stem pins planted on the stem glass 11 are immersed in the insulating oil 3,
The positive terminal + of the knocking power supply ACK is connected to the anode button, the negative terminal-is connected to the IMR pin 2, and the stem pins other than the IMR pin 2 are commonly connected to lower the ground potential.

The primary winding P side of the transformer T of the knocking power supply ACK is connected to a 60 Hz AC source of the commercial power supply 10, and the secondary winding S side is connected to the positive terminal + of the step-up coil whose middle point is grounded. Button 8 and the negative terminal-
Connected to MR pin 2.

FIG. 1 shows an electron gun of the above-described color CRT and a schematic electrode configuration at the time of main knocking. Electrode configuration shown in Figure 1 is omitted redundant description like reference numbers refer to like parts so exactly as that described is the electrode having the same configuration in FIG. 5, first electrodes G _1, second in the present example 4 is constructed multi prefocus electrode in the electrode G _4, the fifth electrode G _5V and the intermediate electrode G _M and the sixth main electron lens electrode G ₆ for the anode is configured for focusing.

In the knocking step described with reference to FIG. 4, the first electrode G ₁ , the second electrode G ₂ , the second third electrode G _3V , the first third electrode G _3C , the fourth electrode G ₄ , The stem pins of the fifth electrode G _{5C and} the second fifth electrode G _5V are commonly connected and grounded.

Further, the IMR pin 2 and the anode electrode 6
Negative terminal of the knocking power ACK to the anode button 8 connected internally carbon film 12 to the electrode G ₆ - and to connect the positive terminal +. In FIG. 1, knocking power supply ACK is 2
As shown in FIG. 2, positive and negative AC power supply waveforms are applied from the grounded middle point of the secondary winding S of the transformer T as shown in FIG. That is, the knocking voltages are −60 kV to 70 kV and +60 kV to 70 kV.
Is applied between the sixth electrode G ₆ of the anode and the IMR pin 2, so that 120 kV is applied between the sixth electrode G ₆ and the IMR pin 2.
A knocking voltage having a potential difference of １４０140 kV is supplied for a few seconds.

FIG. 3 shows an example of an output waveform on the negative side of such a knocking voltage. In this case, the half width is about 1
Although it is 20 μs, a voltage of ± 60 kV will be supplied between the IMR pin 2 and the pin of another electrode planted on the stem glass 11 which has been dropped to the ground potential. There is a risk of causing a discharge between other ground electrode pins.

Therefore, in this embodiment, in order to improve the pressure resistance between the pins, the container or the like is filled with an insulating oil 3 such as Fluorinert (trade name of 3M), and the stem pin side is immersed in the insulating oil 3 to perform main knocking. I did it. In order to prevent such a breakdown voltage between pins, it is necessary to suppress the half width of the output waveform shown in FIG. 3 to a predetermined value.

As described above, at the time of main knocking of the CRT, the voltage is divided by the high resistances R ₁ and R ₂ of the internal division resistance IMR,
Electron gun such as anode voltage is supplied to the intermediate electrode G _M 1
However, the sixth electrode G ₆ for the anode and the intermediate electrode G _M
Effective knocking is performed between, begin discharging from burrs of the intermediate electrode G _M, is scattered burrs, is performed conditioning to clean the electrode surface, even when a high anode voltage is applied to the production time of discharge or the like And a high-quality CRT that does not cause the problem can be obtained.

[0033]

According to CRT manufacturing method of the present invention, the sixth from the electrode G ₆ between the intermediate electrode G _M through the high resistance of the internal dividing resistor IMR high voltage for the anode (e.g., 14 kV)
Is applied to the sixth electrode G _6.
And it is possible to perform effective knocking processing between the intermediate electrode G _M, it is possible to enhance the knocking effect of the conditioning hard high voltage application electrode side.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of main knocking of the present invention.

FIG. 2 is a configuration diagram of a CRT used in the present invention.

FIG. 3 is an output waveform diagram used for knocking according to the present invention.

FIG. 4 is a manufacturing process diagram of a conventional CRT.

FIG. 5 is an explanatory view of a conventional main knocking.

[Explanation of symbols]

1 electron gun, 2 IMR pins, 3 insulating oil, G _M intermediate electrode, G ₆ sixth electrode (anode electrode)

Claims (2)

[Claims] An intermediate electrode disposed between a focus electrode and an anode electrode of a cathode ray tube so as to have a potential higher than the focus voltage and lower than the anode voltage through an internal dividing resistor, and a high voltage is applied from the anode electrode to the intermediate electrode. Wherein all of the pre-focus and focus electrode side stem pins of the cathode ray tube are set to the ground potential, and one end of the anode electrode and one end of the internal dividing resistor are connected. A method of manufacturing a cathode ray tube, characterized in that an alternating high voltage is applied between stem pins and all the stem pins are immersed in insulating oil to perform knocking. 2. The method for manufacturing a cathode ray tube according to claim 1, wherein one end of the AC high voltage power supply is connected to an anode button, and the other end is connected to an internally divided resistor extraction stem pin.