JPH117911A - Cathode-ray tube device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ground a conductive membrane for electric field shielding, enhance a shield effect of an alternating electric field, and meet TCO specifications by pasting a conductive adhesive tape on the conductive membrane for electric field shielding formed on an outer surface of a face panel and connecting the tape to an explosion-proof band. SOLUTION: Each conductive adhesive tape 12 is pasted in parallel respectively on four sides of a respective fluorescent screen part 13 on a conductive membrane for electric field shielding formed on a full face on the outer surface of a face panel 2, four conductive adhesive tapes 12 are connected to an explosion-proof band 4 by a same conductive adhesive tape 12a, and a conductive membrane for electric field shielding is grounded. At this time, the conductive adhesive tapes 12 and 12a are at the outside of a fluorescent screen part 13, and occupy 75% or more against an outer circumference area of the face panel 2 while each side of the explosion-proof band 4 is reached. A cone part conductive membrane is formed in an area from a cone part to a neck part of a funnel, and an alternating electric field radiating from a deflection yoke engagingly mounted to the funnel to the front face of the face panel 2 is interrupted.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a funnel provided with a conductive film for adding a capacitance, a deflection yoke fitted to a cone of the funnel, and an opposite side to the cone of the funnel. In particular, the present invention relates to a cathode ray tube device having a face panel and a device for reducing an alternating electric field radiated from a deflection yoke.

[0002]

2. Description of the Related Art FIG. 5 is a block diagram showing a conventional cathode ray tube device. In the figure, a funnel 1 is composed of a funnel body 1c having a neck 1a, a cone 1b, and a high-pressure anode button 1d, and is frit-sealed to the face panel 2. The joint between the neck portion 1a and the cone portion 1b is called a neck seal line 1e, and the glass thickness of the funnel 1 at the portion of the neck seal line 1e is slightly thinner, and its strength is weaker than other portions. The electron gun 3 is sealed in the neck portion 1a of the cathode ray tube 20.

[0003] An explosion-proof band 4 for guaranteeing explosion-proof characteristics is wound around the side surface of the face panel 2.
At the corner, a hook 4a for suspending the cathode ray tube 20 on a housing (not shown) is provided physically. A high-pressure anode button 1d provided on the funnel body 1c
A silicon resin film 5 for insulation is formed around the substrate.

The cathode ray tube 20 is formed with a conductive film 6 for adding capacitance (conductive film for adding capacitance). Usually, this conductive film 6 is formed by applying graphite to the outer surface of the funnel body 1c. 28
Is a straight line indicating the tube axis of the cathode ray tube 20, which is parallel to the neck 1a.

FIG. 6 shows the face panel 2 of the cathode ray tube 20.
FIG. 5 and 6, an electric field shielding conductive film 11 is formed on the outer surface of the fluorescent screen portion 13 of the face panel 2, and four conductive lines are formed on each side of the face panel 2 as shown in FIG. Conductivity between the electric field shielding conductive film 11 and the explosion-proof band 4 is established by the conductive adhesive tape 12a. The explosion-proof band 4 is further connected to the conductive film 6 formed on the outer surface of the funnel 1 via the ground wire 29, and the explosion-proof band 4 is grounded, so that the alternating electric field of the cathode ray tube 20 is formed. Shield leaks.

FIG. 7 shows a deflection yoke 7 on the cathode ray tube 20.
FIG. 8 is a basic configuration diagram of the deflection yoke 7. As shown in FIG. 7, a deflection yoke 7 for deflecting an electron beam is attached to the cathode ray tube 20 at a position between the cone portion 1b and the neck portion 1a. As shown in FIG. 8, the deflection yoke 7 is composed of a horizontal deflection coil 7a, a vertical deflection coil 7b, and a deflection yoke main body 7c. Reference numeral 10 designates the deflection yoke 7 as a cathode ray tube 20.
A mounting band for mounting on

Next, the operation will be described. Neck 1a
When an electron beam is emitted from the electron gun 3 sealed in
The electron beam is deflected by a predetermined amount in the horizontal and vertical directions by the horizontal deflection coil 7a and the vertical deflection coil 7b of the deflection yoke 7, scans the phosphor screen formed on the inside of the phosphor screen 13 of the face panel 2, and scans the desired surface. Project an image. The deflection width of the electron beam by the deflection coils 7a and 7b at this time is inversely proportional to the square root of the voltage applied to the anode button 1d.

In the cathode ray tube 20 having the above-described configuration, when the deflection yoke 7 deflects the electron beam, an alternating electric field is generated radially around the deflection yoke 7. In order to shield such an alternating electric field, measures such as providing a grounded conductive film on the outer surface of the face panel 2 or forming an electric field shield surface on the surface of the face panel 2 are taken.

In recent years, there has been a concern about the effect of the alternating electric field on the human body, and various proposals have been made regarding the regulation of electromagnetic waves generated from the display monitor. Representatives of the regulation include the Swedish Central Labor Council (TC)
O) Leakage electric field standard (hereinafter referred to as ΤCO standard)
There is. According to the TCO standard, in an environment of a temperature of 20 ° C. and a humidity of 21%, 3 cm from the face panel surface of the display monitor.
The electric field strength at the point of 0 [cm] is VLF (Very Low Frequ
ency: 2 [kHz] to 400 [kHz]) In the band, it is regulated to 1.0 [V / m] or less.

[0010]

In order to shield the above-mentioned alternating electric field, a grounded conductive film 11 is provided on the outer surface of the face panel 2 to form an electric field shield surface on the face panel surface. As the outer surface film of the face panel 2, a resistance value of 10 ⁷ to 10 ⁹ [Ω / □]
Using only the electric field shielding conductive film 11
It was difficult to comply with the standards. An electric field shielding conductive film satisfying the TCO standard has a resistance value of 10 ² [Ω].
/ □] must be the following. However,
When the outer surface film is provided as the electric field shielding conductive film 11 on the face panel 2, the film surface strength is insufficient, the resistance value increases due to scratches, peeling, deterioration, etc., and the electric field shielding effect is easily increased. There is a problem that it is in an unstable state of being lowered, and it is difficult to maintain the electric field shielding effect.

In addition, the conventional grounding method of locally conducting between the explosion-proof band 4 and the conductive film 11 for electric field shielding using the conductive adhesive tape 12a has a problem that the electric field shielding effect is not sufficient. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems. By increasing the conductivity between a conductive film and an explosion-proof band and grounding the same, the shielding effect of an alternating electric field can be increased, and the TCO can be improved. It is an object of the present invention to provide a cathode ray tube device satisfying the standard.

[0013]

According to a first aspect of the present invention, there is provided a cathode ray tube device comprising: a funnel provided with a conductive film for adding capacitance; a deflection yoke fitted to the funnel; and a funnel cone. A cathode ray tube device having a face panel arranged on the side opposite to the part, a conductive film for electric field shielding formed on the outer surface of the face panel, an explosion-proof band tightened around the face panel and an electric field shielding Equipped with a conductive adhesive tape for conducting between the conductive film and a cone conductive film formed in the area from the cone part to the neck part of the funnel, the alternating electric field radiated from the deflection yoke to the front of the face panel is provided. It is shielded.

In the cathode ray tube device according to a second aspect of the present invention, the conductive film for electric field shielding on the outer surface of the face panel has a resistance value of 10 ³ to 10 ⁵ [Ω / □].

According to a third aspect of the present invention, there is provided a cathode ray tube device, wherein a conductive film is formed on four sides surrounding the fluorescent screen on the electric field shielding conductive film on the outer surface of the face panel. An adhesive tape is used to establish conduction with the explosion-proof band.

According to a fourth aspect of the present invention, in the cathode ray tube device, the conductive film is formed of a conductive adhesive tape.

In the cathode ray tube device according to a fifth aspect of the present invention, the occupation ratio of the conductive film is set to 75% or more with respect to the area outside the fluorescent screen portion extending to the end of the explosion-proof band of the face panel.

In the cathode ray tube device according to a sixth aspect of the present invention, the cone conductive film is formed on the funnel continuously with the conductive film for adding capacitance.

In a cathode ray tube device according to a seventh aspect of the present invention, the cone portion conductive film is a conductive film for electric field shielding having a resistance value of 10 ² [Ω / □].

The cathode ray tube device according to claim 8 of the present invention is such that an insulator for electrically insulating the deflection yoke is provided on the surface of the cone conductive film.

[0021]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
An embodiment of the present invention will be described.

FIG. 1 is a side view showing a cathode ray tube device of the present invention, and FIG. 2 is a front view showing a fluorescent screen portion of a cathode ray tube 20. In FIG. 1, reference numeral 8 denotes an electric field shielding cone conductive film provided for forming an electric field shielding surface. The cone-portion conductive film 8 is provided so as to be electrically connected to the capacitance-adding conductive film 6 formed on the outer surface of the funnel body 1c of the conventional cathode ray tube. The resistance of the cone conductive film 8 formed by applying graphite from the cone 1b to the neck 1a is set to about 10 ² [Ω / □]. These conductive films 6, 8 formed on the outer surface of the funnel 1
9 is grounded via the explosion-proof band 4.

Reference numeral 9 denotes an insulator cover provided for electrically insulating the cone conductive film 8 from a coil portion of a deflection yoke (not shown). The insulator cover 9 has a funnel shape shown in FIG.
To the neck 1a. The gap between the cone conductive film 8 and the insulator cover 9 is filled with an insulative gel-like insulating silicon grease 30. The deflection yoke 7 shown in FIG. 8 is fitted from above the insulator cover 9, and a cathode ray tube 20 is formed as shown in FIG.

An electric field shielding conductive film 11 is formed on the entire outer surface of the face panel 2 and has a resistance value of about 10 ^{3 to} 10 ⁵ [Ω / □]. FIG.
In the figure, reference numeral 12 denotes a conductive film which is a means for conducting the electric field shielding conductive film 11 with the explosion-proof band 4. Here, as the conductive film 12, for example, four conductive adhesive tapes are stuck on the outer surface of the face panel 2 of the cathode ray tube 20 and around the fluorescent screen portion 13.

That is, the conductive adhesive tapes 12 adhered on the electric field shielding conductive film 11 are provided in parallel with the four sides of the fluorescent screen portion 13, respectively.
6 (conventional example), the four conductive adhesive tapes 12a are attached so as to connect the four conductive adhesive tapes 12 to the explosion-proof band 4, respectively. Grounded. These conductive adhesive tapes 12 and 12 a occupy 75% or more of the outer peripheral area of the face panel 2 between the outer side of the fluorescent screen portion 13 and each side of the explosion-proof band 4.

Next, the thus constructed cathode ray tube 20
The operation of will be described. In the cathode ray tube 20, the conductive films 6 and 8 on the outer surface of the funnel 1 are connected to the explosion-proof band 4 by an earth wire 29, and grounded through the explosion-proof band 4. Further, the conductive adhesive tapes 12 and 12a conduct between the electric field shielding conductive film 11 on the outer surface of the face panel 2 and the explosion-proof band 4 on the side peripheral surface, and the electric field shielding conductive film 11 Part conductive film 8,
It is set to an equipotential surface of 0 V together with the conductive film 6 for adding capacitance. As a result, a surface having an electric field shielding effect is formed on the entire area of the deflection yoke 7 and the outer surface of the face panel 2, so that the effect of reducing the alternating electric field can be obtained.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS In the embodiment of the present invention, a cathode ray tube is used.
When the means shown in Table 1 were used as an alternating electric field reduction measure, the following results were obtained. Table 1
Shows the measured electric field strength values VLF [V / m] in the following two comparative examples for comparison with the examples.

In Comparative Example 1, a resistance value of 1 was applied to the face panel 2.
This corresponds to a conventional example (see FIGS. 5 to 8) in which a conductive film 11 for electric field shielding of 0 ⁷ [Ω / □] is provided, and the cone portion conductive film 8 and the conductive adhesive tape 12 are not used.

In Comparative Example 2, no conductive film was formed on the cone portion, and the conductive film 11 on the outer surface of the face panel 2 was used.
This is a case where a resistance value of 10 ⁵ [Ω / □] is used.
Regarding the measured electric field strength, there is hardly any difference from Comparative Example 1.

[0030]

[Table 1]

Embodiment 1 In Example 1 shown in Table 1, a conductive film having a resistance of 10 ² [Ω / □] is formed as the cone conductive film 8. The electric field shielding conductive film 11 on the outer surface of the face panel 2 has a resistance value of 10 ⁷ [Ω / □] as in Comparative Example 1. Was attached so that only the conductive adhesive tape 12a at four locations was connected to the explosion-proof band 4 as in Comparative Examples 1 and 2.

Example 1 in which the cone portion conductive film 8 was formed
In this case, an effect is obtained that the alternating electric field can be reduced to nearly 50% in comparison with Comparative Example 1.

However, in the first embodiment, the TC restricts the electric field strength (VLF) at a point 30 [cm] from the face panel surface of the display monitor to 1.0 [V / m] or less.
Does not satisfy O standard.

Embodiment 2 FIG. As shown in Table 1, the cone portion conductive film 8 was formed, and the electric field shielding conductive film 11 having a resistance value of 10 ⁵ [Ω / □] was formed on the outer surface of the face panel 2.
(Panel conductive film) was formed. In Example 2 in which such measures are combined, the effect of reducing the alternating electric field can be obtained up to nearly 80% in comparison with Comparative Examples 1 and 2, and up to nearly 60% in comparison with Example 1. Was. That is, 1.0 [V / m] which is the upper limit of the electric field strength (VLF) of the TCO standard is realized.

Embodiment 3 FIG. However, the effect of reducing the alternating electric field in the second embodiment is not always satisfactory. In the third embodiment, conductive adhesive tapes 12 are further provided on four sides of the face panel 2,
Is 75% of the area outside the phosphor screen. In the cathode ray tube of Example 3, the alternating electric field is reduced to nearly 90% in comparison with Comparative Example 1 and to nearly 40% in comparison with Example 2, and as a result, the TCO standard is satisfied.

As described above, the conductive adhesive tape 12 is attached so as to surround the fluorescent screen portion 13 so that the occupation ratio to the outer surface area of the fluorescent screen portion up to the explosion-proof band 4 is 75% or more. The grounding property of the shielding conductive film 11 can be improved, and the effect of reducing the alternating electric field by 10 to 20% can be obtained.

[0037]

Since the present invention is configured as described above, it has the following effects.

According to the first aspect of the present invention, the alternating electric field of the deflection yoke transmitted through the funnel and radiated to the front surface of the face panel is reliably reduced by the electric field shield at the cone and the face. Can be.

According to the cathode ray tube device described in claim 2, the TCO standard can be satisfied by reducing the alternating electric field.

According to the third aspect of the present invention, the conductivity between the conductive film for shielding the electric field on the outer surface of the face panel and the explosion-proof band can be improved.

According to the cathode ray tube device described in claim 4, a conductive film can be easily provided on the outer surface of the face panel.

According to the cathode ray tube device described in claim 5, the grounding property of the conductive film for electric field shielding is enhanced, and the alternating electric field can be significantly reduced.

According to the cathode ray tube device described in claim 6, both the cone conductive film and the conductive film for adding capacitance are set to 0.
It can be set on the equipotential surface of V, and the alternating electric field of the deflection yoke radiated to the front of the face panel can be reduced.

According to the cathode ray tube device described in claim 7, the alternating electric field of the deflection yoke radiated to the front surface of the face panel can be further reduced.

According to the cathode ray tube device described in claim 8, the cone portion conductive film and the coil portion of the deflection yoke can be electrically insulated.

[Brief description of the drawings]

FIG. 1 is a configuration explanatory view showing a cathode ray tube according to an embodiment of the present invention.

FIG. 2 is a front view showing a conductive means for connecting a transparent conductive film formed on the outer surface of the face panel and an explosion-proof band.

FIG. 3 is a perspective view showing an insulator cover.

FIG. 4 is a diagram showing a state in which a deflection yoke is fitted to the cathode ray tube according to the embodiment of the present invention.

FIG. 5 is a configuration explanatory view showing a conventional cathode ray tube.

FIG. 6 is a front view showing a conductive means between an explosion-proof band and a transparent conductive film formed on the outer surface of the face panel.

FIG. 7 is a diagram showing a state in which a deflection yoke is fitted on a conventional cathode ray tube.

FIG. 8 is a perspective view showing a deflection yoke.

[Explanation of symbols]

1 funnel, la neck, lb cone, lc funnel body, ld high pressure anode button, le neck seal line, 2 face panel, 3 electron gun, 4 explosion proof band, 4a hook, 5 silicone resin film, 6 static Conductive film for adding capacitance, 7 deflection yoke, 7a horizontal deflection coil,
7b vertical deflection coil, 7c deflection yoke main body,
8 Cone conductive film, 9 Insulator cover, 10
Mounting band, 11 Conductive film for electric field shielding, 1
2 conductive film (conductive adhesive tape), 12a conductive adhesive tape, 13 fluorescent screen, 20 cathode ray tube, 2
8 Tube shaft, 29 Ground wire, 30 Insulated silicon grease.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yu Fujii 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Mikako Maeda 2-3-2 Marunouchi, Chiyoda-ku, Tokyo (72) Inventor Katsuya Kinoshita 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd.

Claims (8)

[Claims] 1. A cathode ray line having a funnel provided with a conductive film for adding capacitance, a deflection yoke fitted to the funnel, and a face panel disposed on a side of the funnel opposite to a cone portion. In the pipe device, a conductive film for electric field shielding formed on the outer surface of the face panel, and a conductive adhesive for conducting between the explosion-proof band tightened around the face panel and the conductive film for electric field shielding. A cathode ray tube device comprising: a tape; and a cone portion conductive film formed in a region from a cone portion to a neck portion of the funnel, wherein an alternating electric field emitted from the deflection yoke to the front surface of the face panel is shielded. . 2. The cathode ray tube device according to claim 1, wherein the electric field shielding conductive film on the outer surface of the face panel has a resistance value of 10 ³ to 10 ⁵ [Ω / □]. Cathode ray tube device. 3. A conductive film is formed on an electric field shielding conductive film on an outer surface of a face panel on which a fluorescent screen is formed as an image display unit and surrounding the fluorescent screen,
3. The cathode ray tube device according to claim 1, wherein the conductive film and the conductive adhesive tape establish electrical continuity between the explosion-proof band and the conductive film for electric field shielding. 4. The cathode ray tube device according to claim 3, wherein the conductive film is formed of a conductive adhesive tape. 5. The method according to claim 5, wherein the conductive film is provided with a thickness of 7% with respect to the area of the fluorescent screen outside the explosion-proof band of the face panel.
4. The method according to claim 3, wherein the occupancy is 5% or more.
A cathode ray tube device according to item 1. 6. The cathode ray tube device according to claim 1, wherein the cone portion conductive film is formed continuously on the funnel with the conductive film for adding capacitance. 7. The cathode ray tube device according to claim 1, wherein the cone portion conductive film is formed as an electric field shielding conductive film having a resistance value of 10 ² [Ω / □]. 8. The cathode ray tube device according to claim 1, wherein an insulator for electrically insulating the deflection yoke from the surface of the cone portion conductive film is provided on a surface of the cone portion conductive film. .