JPH1116516A - Cathode-ray tube and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the time for aging process in the manufacture cathode-ray tube by mounting an electron gun electrode or a deflection coil for irradiating a neck glass inner wall on a neck part, in addition to a defection coil for emitting electron beams to a phosphor screen to emit light from the phosphor screen. SOLUTION: In aging process, the electron emitted from a cathode within an electron gun 2 is collided to an electrode, and a secondary electron generated thereby is partially emitted to a neck glass inner wall, whereby the neck glass is electrically charged. Therefore, this cathode-ray tube is provided with a deflection coil 11 for emitting electron beams to the electrode, generating a secondary electron from the electrode, and emitting the electron to the inner wall of a neck glass 3, in addition to a deflection yoke 8 for emitting a light having a prescribed pattern from a phosphor screen. Thus, the charge quantity per unit time on the inner wall of the neck glass 3 can be increased to shorten the time for stabilizing the potential of the neck glass 3.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cathode ray tube and a method for manufacturing the same.

[0002]

2. Description of the Related Art A conventional cathode ray tube is shown in FIG. This cathode ray tube is an electron beam tube having an electron gun 2, a deflection yoke 8 for deflecting an electron beam 10 emitted from the electron gun 2, and a fluorescent screen 9 for visualizing an image drawn by the electron beam 10.
The following examples are known examples related to this type of apparatus.

JP-A-56-97947, JP-A-56-97948
No. gazette.

[0004]

In a conventional cathode ray tube manufacturing process, there is an aging step of emitting an electron beam 10 and drawing a predetermined pattern on the phosphor 9. This is a process that requires several tens of minutes or more for stable operation of the cathode ray tube. In the conventional cathode ray tube, charging occurs on the inner wall of the neck glass 3 during the aging process. For this reason, the inner wall potential of the neck glass 3 fluctuates with time due to charging. It is important in the mass production process to shorten the time until the inner wall potential of the neck glass 3 is stabilized. It is an object of the present invention to shorten the aging process.

[0005]

The above-mentioned problems are solved by the following means.

[0006] In addition to the deflection yoke 8 for irradiating the phosphor screen 9 with electrons to emit light, the deflection section for irradiating the electron gun electrodes 2b to 2f or the inner wall of the neck glass 3 is attached to the neck. Solve the problem.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The reason why charging occurs during the aging step is that electrons emitted from the cathode in the electron gun 2 are generated by the electrodes 2b.
2f, and a part of the generated secondary electrons are charged by irradiating the inner wall of the neck glass 3. Due to the time variation of the charge amount, the inner wall potential of the neck glass 3 fluctuates with time, and becomes stable after the inner wall potential fluctuates until the secondary electron emission coefficient becomes 1. For this reason, in order to shorten the time until the inner wall potential of the neck glass 3 is stabilized, it is necessary to increase the number of electrons that irradiate the inner wall of the neck glass 3.

By attaching the deflection portion of the present invention to the neck portion, the number of electrons colliding with the electrodes 2b to 2f is increased, the number of secondary electrons generated therewith is increased, and the number of electrons irradiating the inner wall of the neck glass is increased. Therefore, the potential of the neck glass 3 can be stabilized in a shorter time than in the related art.

(Embodiment 1) FIG. 1 shows a first embodiment of the present invention.
Shown in In addition to the deflection yoke 8 for causing the phosphor screen 9 to emit light in a predetermined pattern, the electrodes 2b to 2f are irradiated with an electron beam 10 to generate secondary electrons from the electrodes 2b to 2f, thereby irradiating the inner wall of the neck glass 3 with electrons. Deflection coil 11 of the present invention
It is a CRT characterized by having. In the cathode ray tube of the present invention, the time required for stabilization can be shortened by increasing the amount of charge per unit time on the inner wall of the neck glass 3 as compared with the prior art.

FIG. 2 is a diagram illustrating the relationship between the stabilization time of the inner wall potential of the neck glass 3 and the deflection coil 11 of the present invention. Stabilization time Δ of conventional CRT neck glass 3
By operating the deflection coil 11 of the present invention that irradiates the electrodes 2b to 2f or the neck glass 3 with respect to t1, the neck glass stabilization time can be set to Δt2 (Δt2 <Δt1). In a conventional cathode ray tube, Δt1 is 2
Although there is 0 minutes or more, Δt2 can be made less than 20 minutes by the operation of the deflection coil 11 of the present invention.

The reason why stabilization is achieved in a short time will be described with reference to FIGS. FIG. 3 is a diagram showing electron irradiation on the neck glass 3. FIG. 4 is a diagram showing the relationship between the secondary electron emission coefficient and the electron irradiation energy. Deflection coil 1 of the present invention
Electrons that collide with the electrode 2 are irradiated on the neck glass as shown in FIG. Alternatively, there is a type in which the inner wall of the neck glass 3 is directly irradiated from the cathode in the electron gun 2 as shown in FIG. The relationship between the energy of irradiating the electron neck glass (primary electron energy) and the secondary electron emission coefficient is as shown in FIG. Generated by primary electron energy. The primary electron energy is E1 in FIG.
In the range between E2 and E2, positive charging occurs due to electron irradiation, the inner wall potential of the neck glass fluctuates to the positive side, and the potential of the neck glass 3 increases until the primary electron energy reaches E2 in FIG. Potential.

By operating the deflection coil of the present invention, the time required to reach the neck glass stabilizing potential can be reduced. It is desirable that the deflection coil 11 of the present invention be capable of vertical deflection and horizontal deflection. It is desirable that the deflection frequency can be used from several Hz to several hundred MHz.

(Embodiment 2) FIG. 5 shows a second embodiment of the present invention.
Shown in Further, the inner wall of the neck glass 3 or the electrodes 2b to
FIG. 6 shows the arrangement of the deflection electrode of the present invention for causing electrons to collide with 2f as viewed from the terminal side. In addition to the deflection yoke 8 for causing the phosphor 9 to emit light in a predetermined pattern, the electrode 2b
A cathode ray tube having the deflection electrode 12 of the present invention that irradiates the electron beam 10 to 2f, generates secondary electrons from the electrodes 2b to 2f, and irradiates the inner wall of the neck glass 3 with electrons. The deflecting electrode 12 of the present invention is similar to that of the first embodiment.
Has the same effect as the deflection coil 11 of the present invention shown in FIG.
By increasing the amount of charge on the inner wall of the neck glass 3 per unit time as compared with the prior art, the time until stabilization can be shortened.

The deflection electrodes 12 of the present invention emit the electron beam 10 by an electric field, and apply a voltage between the corresponding electrodes to perform vertical deflection or horizontal deflection. In order to make the electron irradiation on the neck glass 3 uniform, it is desirable that the vertical deflection and the vertical deflection be alternate voltage. It is desirable that the frequency of the alternating voltage can be used from several Hz to several hundred MHz.

[0015]

The reason why charging occurs during the aging step is as follows.
Electrons emitted from the cathode in the electron gun 2 are applied to the electrodes 2b to 2f.
Some of the generated secondary electrons are charged by irradiating the inner wall of the neck glass 3. Due to the time variation of the charge amount, the inner wall potential of the neck glass 3 fluctuates with time, and becomes stable after the inner wall potential fluctuates until the secondary electron emission coefficient becomes 1. For this reason, in order to shorten the time until the inner wall potential of the neck glass 3 is stabilized, it is necessary to increase the number of electrons that irradiate the inner wall of the neck glass 3.

As in the present invention, the number of electrons colliding with the electrode 2 can be increased by attaching a deflection coil 11 or a deflection electrode 12 as a deflection section in addition to the deflection yoke 8 for emitting a predetermined pattern on the phosphor screen 9. As a result, the number of secondary electrons generated thereby increases, and the number of electrons irradiating the inner wall of the neck glass increases, whereby stabilization can be achieved in a shorter time than in the related art.

[Brief description of the drawings]

FIG. 1 shows a cathode ray tube of the present invention including a deflection coil for causing electrons to collide with an inner wall of a neck glass or an electrode.

FIG. 2 is a characteristic diagram illustrating the relationship between the stabilization time of the inner wall potential of the neck glass and the deflection coil of the present invention.

FIG. 3 is a view showing electron irradiation on a neck glass.

FIG. 4 is a characteristic diagram showing a relationship between a secondary electron emission coefficient and electron irradiation energy.

FIG. 5 is a CRT diagram of the present invention including a deflection electrode for causing electrons to collide with an inner wall of a neck glass or an electrode.

FIG. 6 is a diagram of an arrangement of deflection electrodes according to the present invention as viewed from a terminal side.

FIG. 7 is a conventional cathode ray tube.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Funnel glass, 2 ... Electron gun, 2a ... Anode, 2b
２2f: electrode, 3: neck glass, 4: conductive film, 5: contact, 6, 7: terminal, 8: deflection yoke, 9: fluorescent screen, 1
0: electron beam, 11: deflection coil of the present invention for charging neck glass, 12: deflection electrode of the present invention for charging neck glass.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shoji Shirai 3300 Hayano, Mobara-shi, Chiba Prefecture Electronic Device Division, Hitachi, Ltd. (72) Inventor Go Uchida 3300, Hayano, Mobara-shi, Chiba Electronic Device Business, Hitachi, Ltd. In-house (72) Inventor Black ▲ 葛 ▼ 守 Mamoru Hara 3300 Hayano Mobara-shi, Chiba Electronic Device Division, Hitachi, Ltd.

Claims (4)

[Claims] An electron gun, a deflection yoke for deflecting an electron beam emitted from the electron gun, and a deflection coil for irradiating the phosphor screen with electrons to emit light in a cathode ray tube having a phosphor screen for visualizing an image drawn by the electron beam. A cathode ray tube, wherein a deflection coil for irradiating an electron gun electrode or an inner wall of the neck glass is attached to the neck portion. 2. A deflection coil for irradiating a fluorescent screen with electrons to emit light in a cathode ray tube having an electron gun, a deflection yoke for deflecting an electron beam emitted from the electron gun, and a fluorescent screen for visualizing an image drawn by the electron beam. In addition, a method for manufacturing a cathode ray tube, comprising attaching a deflection coil for irradiating an electron gun electrode or an inner wall of a neck glass to a neck portion. 3. A deflection coil for irradiating a fluorescent screen with electrons to emit light in a cathode ray tube having an electron gun, a deflection yoke for deflecting an electron beam emitted therefrom, and a fluorescent screen for visualizing an image drawn by the electron beam. In addition to the above, a cathode ray tube is characterized in that a deflection electrode for irradiating an electron gun electrode or an inner wall of a neck glass is attached to a neck portion. 4. A deflection coil for irradiating a fluorescent screen with electrons to emit light in a cathode-ray tube having an electron gun, a deflection yoke for deflecting an electron beam emitted from the electron gun, and a fluorescent screen for visualizing an image drawn by the electron beam. In addition to the above, a method for manufacturing a cathode ray tube, comprising attaching a deflection electrode for irradiating an electron gun electrode or an inner wall of a neck glass to a neck portion.