JPH02104074A - Television receiver - Google Patents

Abstract

PURPOSE:To obtain a television receiver without requiring the adhesion of a conductive tape or the like even with the employing of a charge prevention processing type cathode ray tube by employing a conductive member to at least of a front mask part in contact with the charge prevention processing type cathode ray tube such as an escutcheon part. CONSTITUTION:At least part of a front mask part of a cabinet is formed by a conductive member in a television receiver employing a charge prevention processing type cathode ray tube. Thus, it is not required to adhere any conductive tape between a transparent conductive film and a metal-made explosion proof band. Thus, the manufacture process is saved, the material cost is reduced and the television receiver whose reliability is considerably improved is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a grounding structure for a television receiver, particularly for an antistatic cathode ray tube.

[Prior Art] Recently, as color cathode ray tubes have become larger, the voltage applied to the phosphor screen of the cathode ray tube (ie, electron beam acceleration voltage) has become higher in order to improve brightness performance and focus performance. In conventional 21-inch class color cathode ray tubes, the high voltage applied to the phosphor screen was about 25 to 27 kV, but in recent 30-inch and larger color cathode ray tubes, a high voltage of 30 to 34 kV is applied. . For this reason, the outer surface of the face plate of the color cathode ray tube is charged up more than before when the TV set's power is turned on and off, making it easier for fine dust in the air to adhere to the outer surface of the face plate. becomes more noticeable, and as a result, the brightness performance of the color cathode ray tube deteriorates.

Furthermore, the charge-up on the outer surface of the face plate may cause a discharge phenomenon when the viewer's body approaches, giving the viewer a sense of discomfort.

The curved line and L' in FIG. 4 represent potential changes on the outer surface of the face plate when the power is turned on and off.

In order to eliminate this charge-up phenomenon on the outer surface of the cathode ray tube's face plate, a cathode ray tube with antistatic treatment is developed, in which a smooth transparent conductive film is formed on the outer surface of the cathode ray tube's face plate to allow the charge to escape to ground. It has started to be used.

The principle of this antistatic cathode ray tube will be explained with reference to FIG. The antistatic cathode ray tube (3), like a conventional cathode ray tube, has an electron gun (not shown) built into the net part (6).
While the electron beam emitted from the cathode ray tube is electromagnetically deflected from the outside of the cathode ray tube by the deflection yoke (7), it is applied to the fluorescent screen provided on the inner surface of the face plate (4) via the high voltage button (5). A high voltage accelerates the electron beam, and the energy excites the phosphor screen to emit light to extract optical output. The high voltage applied to the phosphor screen on the inner surface of the face plate (4) causes various adverse effects as described above, so as a countermeasure, a smooth transparent conductive film is applied to the outer surface of the face plate (4). By forming the transparent conductive film (11) and grounding the transparent conductive film (11), the charge always escapes to the ground and no charge-up occurs. In order to ground this transparent conductive film (11), it is sufficient to establish continuity between it and the metal explosion-proof band (8) using conductive tape (1). is the ear (
9) is connected to the ground wire (10). Curves M and M' in Fig. 4 represent potential changes on the outer surface of the face plate when the power is turned on and off for a cathode ray tube with conduction prevention treatment that is grounded by forming a smooth transparent conductive film on the outer surface of the face plate. It can be seen that the charge-up is significantly smaller.

Such a smooth transparent conductive film (11) requires a certain degree of hardness and adhesiveness, so silica (S 102 ) is used.
It is common to form a system film.

Such a cathode ray tube or antistatic treated cathode ray tube (3)
When incorporating into a television receiver, the cathode ray tube or antistatic cathode ray tube (3) is housed in the conventional cabinet (2), and the metal explosion-proof band (8) of the cathode ray tube is installed.
The mounting is carried out by fixing the holes in the ears (9) in place in the cabinet (2) with metal screws (12) for fixing the cathode ray tube. When such fixing is performed, the escutcheon (14) of the front mask (13) of the cabinet (2) will be attached to the face plate (4) of the cathode ray tube or the transparent conductive film (11) in the case of an antistatic cathode ray tube. It serves as the outer edge of the fluorescent screen of the cathode ray tube.

[Problems to be Solved by the Invention] Since the conventional television receiver is configured as described above, it is necessary to create a structure for electrical connection between the metal explosion-proof band provided on the cathode ray tube and the transparent conductive film. It is necessary to attach conductive tape, which not only increases manufacturing process and material costs, but also causes problems such as uneven conductivity and lack of reliability due to peeling over time. there were.

This invention was made with the aim of solving this problem, and even when using an antistatic treated cathode ray tube in which a transparent conductive film is applied to the outer surface of the face plate of the cathode ray tube, it is not conductive as before. An object of the present invention is to provide a television receiver that does not require attachment of tape or the like.

[Means for Solving the Problems] A television receiver according to the present invention is provided with a conductive member applied to at least a portion of the front mask portion, such as the escutcheon portion, in contact with the antistatic cathode ray tube, so that this portion can be grounded. It has a built-in cabinet.

[Function] In the television receiver according to the present invention, at least a part of the front mask part of the cabinet that houses and supports the antistatic treated cathode ray tube is made of a conductive member and can be grounded, so that the transparent conductive film of the cathode ray tube is not charged. is grounded through a conductive member in the front mask section, and there is no need to attach a conductive tape to the cathode ray tube as in the past.

[Example] Next, the present invention will be explained in more detail with reference to an example shown in FIGS. 1 and 2. In both figures, the same parts as in FIG. 3 are designated by the same reference numerals.

The anti-conductive cathode ray tube (3) shown in Figure 1 has the following features: No conductive tape (1) is used to ground the transparent conductive film (11) provided on the surface of the face plate (4). , is exactly the same as the conduction prevention treated cathode ray tube (3) shown in FIG.

According to the embodiment of the invention shown in FIG. 1, the antistatic cathode ray tube (3) is housed in a cabinet (15) made of conductive plastic, and the face plate (4) of the cathode ray tube (3) A transparent conductive film (11) provided on the surface of
) is the front mask (
The mounting is supported and fixed by the ears (9) and metal screws (12) while being in conductive contact with the escutcheon (14) of 13). Here, since the entire cabinet (15) of both the front mask (13) and the escutcheon (14) is made of conductive plastic, the charged charges that fill the face plate portion (4) as a byproduct of high voltage acceleration are As best shown in Figure 2, the transparent conductive film (11) - (conductive) escutcheon (14) - (
Conductive) Front mask (13) - <Made of metal) When installed, it is grounded to the earth (16) through the ear (9), metal screw (12), earth wire (10), and earth (16), causing discharge. Put it away.

As a result, the potential of the face plate (4) becomes a low potential as indicated by M or M' in FIG. 4, and the inconvenience caused by charging is almost eliminated.

Examples of conductive plastic materials forming the conductive cabinet (15) include polymers that are themselves conductive, as well as acryl-nitrile-nabutadiene-styrene (ABS) resin, polybutylene-terephthalate (
A material obtained by kneading metal powder, metal fibers, carbon particles, etc. as a conductive filler into PBT) resin or the like can be used.

In the example, the case where the entire cabinet (15) was made of conductive plastic was shown, but instead of plastic,
For example, various conductive materials such as aluminum can be used.

In addition, the front mask (
13) Only the part 17 may be conductive, and the other parts may be made of wood or plastic and are non-conductive.

Furthermore, in this invention, instead of making the entire front mask part (13) conductive, for example, only the front mask part corresponding to the screwed part of the metal screw (12) is made conductive, so that the surface of the face plate (4) is made conductive. The object of the present invention can also be achieved by grounding several locations.

[Effects of the Invention] As explained above, the present invention is a television receiver using an antistatic treated cathode ray tube, and by configuring at least a part of the front mask part of the cabinet with a conductive member, it can be used in a television receiver that uses a cathode ray tube with antistatic treatment. There is no need to attach conductive tape between the transparent conductive film and the metal explosion-proof band, which eliminates the manufacturing process and reduces material costs, while also significantly improving reliability. There is an effect that can be obtained by getting a receiver.

[Brief explanation of the drawing]

FIG. 1 is a partial vertical sectional view showing an embodiment of a television receiver according to the present invention, FIG. 2 is an enlarged view of the main part of FIG. 1, and FIG. 3 is a conventional cathode ray tube with antistatic treatment. FIG. 4 is a partial vertical sectional view of a television receiver using the television receiver, and shows the potential-time-opening characteristics of the face plate portion of the cathode ray tube used in the television receiver. In the diagram, (1) is the conductive tape, (3) is the anti-conductive cathode ray tube, (4) is the face plate, (5) is the high-voltage button, (7) is the deflection yoke, and (8) is the explosion-proof band. , (9) is the mounting ear, (10) is the ground wire, (11) is the transparent conductive film, (12) is the metal screw, (13) is the front mask, (14) is the escutcheon, (15) is the conductive sex cabinet, (16) is ground. In addition, in the figures, the same reference numerals indicate the same or equivalent parts. Agent: Patent attorney Masuo Oiwa (and 2 others) #Musical surface potential (KV) γ#

Claims (1)

[Claims] An antistatic cathode ray tube having a conductive film on the outer surface of the face plate, and a front mask portion of the cathode ray tube in contact with the conductive film at least partially provided with a conductive member and grounded to house and support the cathode ray tube. A television receiver comprising a cabinet.