JP2002100306A - Cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate inconsistency of homogeneity of a product by making a reinforcing fittings which prevents a deposit position error. SOLUTION: The reinforcing fittings 14 tightly fastened and formed by a circular metal strip to revolute a vicinity of an outer peripheral part of a panel part 1 is made to have no directional property against either of opposing two sides of the panel part 1 in the case looked by a plane of revolution face against the panel part 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a cathode ray tube,
In particular, the present invention relates to a cathode ray tube provided with a reinforcing metal member formed of an annular metal band plate which is wound around the periphery of a panel.

[0002]

2. Description of the Related Art A cathode ray tube used for a television picture tube, a display tube or the like has a fine image reproducibility, and is therefore widely used as a display means of various information processing devices.

[0003] This type of cathode ray tube emits an electron beam generated by a panel section having a phosphor screen formed by applying a phosphor on the inner surface thereof, and an electron beam generating section comprising an indirectly heated cathode, a control electrode and an accelerating electrode. A neck portion accommodating an electron gun having a plurality of electrodes that are focused and accelerated and emitted toward the phosphor screen,
A vacuum envelope comprising a panel portion and a funnel portion connected to a neck portion and provided with a deflection yoke for scanning an electron beam emitted from the electron gun on a fluorescent screen.

FIG. 7 is a schematic cross-sectional view for explaining a schematic structure of a shadow mask type color cathode ray tube as an example of a cathode ray tube, wherein 1 is a panel portion, 2 is a funnel portion, 3 is a neck portion, and 4 is a panel portion. A phosphor screen formed by applying a phosphor on the inner surface of the hologram, 5 is a shadow mask as a color selection electrode, 6 is a magnetic shield for shielding an external magnetic field (geomagnetism), and prevents the trajectory of the electron beam from being changed by terrestrial magnetism. I do. 7 is a deflection yoke, 8 is an external magnetic compensator, 9 is an electron gun having an indirectly heated cathode for emitting three electron beams, 1
0 represents one of the three electron beams as a representative.

[0005] Three electron beams 10 from the electron gun 9 are modulated by video signals from an external signal processing circuit (not shown).
The light is emitted toward the fluorescent screen 4. The electron beam 10 is scanned two-dimensionally on the phosphor screen 4 by passing through horizontal and vertical deflection magnetic fields generated by a deflection yoke 7 provided in a transition region between the neck portion 3 and the funnel portion. The shadow mask 5 passes through a large number of apertures formed in the plane.
Each electron beam of the book is selected for each color to reproduce a required image.

[0006] This type of cathode ray tube has a high degree of vacuum,
In order to prevent the so-called implosion, which is a destruction, a ring-shaped reinforcing metal member 14 is provided around the periphery of the panel portion and tightened with a predetermined force to ensure safety.

FIGS. 8A and 8B are explanatory views of the shape and mounting state of a conventional reinforcing bracket used for a cathode ray tube. FIG. 8A is an upper side view of the cathode ray tube, and FIG. 8B is a front view as viewed from the panel side. .

The reinforcing metal member 14 is formed in a ring shape by welding both ends of a plate-shaped metal band plate preferably made of iron with an X mark in the drawing via an auxiliary plate 14A. In addition, this reinforcing metal fitting 14
At the four corners, lugs 15 for welding to the housings of the television set and the monitor set are welded.

FIG. 9 is a cross-sectional view of the lug attachment portion taken along the line AA in FIG. 8B. A tape of a flexible material is adhered around the periphery of the panel portion 1, and a reinforcing metal fitting 14 is shrink-fitted thereon. The reinforcing metal fitting 14 has a partially folded portion on the front side of the panel portion 1 for increasing the strength, and lugs 15 are fixed to the four corners by welding with x marks. The lug 15 is provided with a mounting hole 15A, and a screw or the like is inserted into the mounting hole 15A to mount the lug 15 on a housing of a television set or a monitor set.

[0010] As disclosed in this type of reinforcing metal fittings,
For example, JP-A-11-167885 can be mentioned.

[0011]

In the above-mentioned conventional reinforcing metal fittings, the reinforcing metal fittings 14 are heated and expanded, and are fixed around the panel portion by a so-called shrink fit technique and tightened. In recent years, automation has progressed, and the main work of mounting the reinforcing metal has been performed by a robot. However, the input of the reinforcing metal into the work process is performed manually. At this time, it is necessary to put the above-mentioned welded portion into a work process at a predetermined position (direction).

For this reason, in the reinforcing bracket having a welded portion at one place as shown in FIG. 8, since the front and rear direction (the tube axis direction of the cathode ray tube) is partially turned back, it is easy to identify the panel portion. Although there is no mistake in the insertion, there is a case where it is inserted in the state where the vertical position with respect to the panel part is reversed, and as a result, the finished cathode ray tube has a difference in the vertical position, and the appearance is uniform The property is impaired.

An object of the present invention is to provide a cathode ray tube in which a reinforcing metal fitting which prevents a difference in a charging position can eliminate the inconsistency in product uniformity.

[0014]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a reinforcing member formed of an annular metal strip which is fastened around the outer peripheral portion of a panel portion. When viewed in a plane, any one of the two opposing sides of the panel was made non-directional. Some examples of this non-directionality are as follows. (1) It has a seamless annular ring shape that is continuous over the entire circumference of the metal strip constituting the reinforcing bracket. (2) A connecting portion is provided at any one of two opposing sides of the metal strip constituting the reinforcing bracket at a point-symmetrical position with respect to the center of the plane of the above-mentioned surrounding surface. (3) An annular ring shape having connecting portions at four corners where two opposing sides of a metal strip constituting a reinforcing metal bracket intersect.

The present invention is not limited to the above-described structure, and various modifications can be made without departing from the spirit of the present invention described in the appended claims.

[0016]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.

FIGS. 1A and 1B are explanatory views of a first embodiment of a cathode ray tube according to the present invention, wherein FIG.
Is a front view as viewed from the panel unit 1 side. In this embodiment, an annular ring shape that is seamless and continuous over the entire circumference of the metal strip forming the reinforcing metal fitting 14 is used.

Accordingly, since there is no directionality in the vertical position with respect to the panel section 1, it can be put into the work process at any position, so that there is no erroneous direction when putting it. This does not impair the uniformity of the appearance of the finished product.

FIGS. 2A and 2B are explanatory diagrams of a second embodiment of the cathode ray tube according to the present invention, wherein FIG. 2A is a top view of the cathode ray tube, and FIG.
Is a front view as viewed from the panel unit 1 side. In this embodiment, the metal strip forming the reinforcing bracket 14 is formed in an annular ring shape over the entire circumference with the auxiliary plates 14A and 14B interposed at the central portions of a pair of long sides facing each other. In this embodiment, two metal strips and two auxiliary boards are prepared.

In this embodiment as well, since there is no directionality in the vertical position with respect to the panel section 1, it can be put into the work process at any position, and no wrong direction occurs when putting it. This does not impair the uniformity of the appearance of the finished product.

FIGS. 3A and 3B are explanatory views of a third embodiment of the cathode ray tube according to the present invention, wherein FIG. 3A is a top view of the cathode ray tube, and FIG.
Is a front view as viewed from the panel unit 1 side. In this embodiment, a position deviated in the opposite direction from the center of a pair of opposed long sides of the metal strip forming the reinforcing metal fitting 14, that is, the center of the plane of the orbiting surface of the reinforcing metal fitting 14 (the center of the panel part 1). The connection portions are provided by the auxiliary plates 14A and 14B at the point symmetrical positions with respect to ()). The metal strip and the auxiliary plate are the second
Two each are prepared as in the embodiment.

Also in this embodiment, since there is no directionality in the vertical position with respect to the panel section 1, it can be put in the work process at any position, and no wrong direction occurs when putting it. This does not impair the uniformity of the appearance of the finished product.

FIG. 4 is an explanatory view of a cathode ray tube according to a fourth embodiment of the present invention. FIG. 4A is a top view of the cathode ray tube, and FIG.
Is a front view as viewed from the panel unit 1 side. In this embodiment, connecting portions welded by the auxiliary plates 14A and 14B are provided at the center of a pair of short sides facing each other on the metal strip forming the reinforcing bracket 14. The metal strip and the auxiliary plate are the second,
Two each are prepared as in the third embodiment.

Also in this embodiment, since there is no directionality in the vertical position with respect to the panel section 1, it can be put into the work process at any position, and no wrong direction occurs when putting it. This does not impair the uniformity of the appearance of the finished product.

FIG. 5 is an explanatory view of a cathode ray tube according to a fifth embodiment of the present invention. FIG. 5 (a) is a top view of the cathode ray tube, and FIG.
Is a front view as viewed from the panel unit 1 side. In this embodiment, a position deviated in the opposite direction from the center of a pair of opposite short sides of the metal strip forming the reinforcing bracket 14, that is, the center of the plane of the orbiting surface of the reinforcing bracket 14 (the center of the panel unit 1). The connection portions are provided at the positions symmetrical with respect to point (1) by the auxiliary plates 14A and 14B. The metal strip and the auxiliary plate are the second
Two each are prepared as in the embodiment.

Also in this embodiment, since there is no directionality in the vertical position with respect to the panel section 1, it can be put into the work process at any position, and no wrong direction occurs when putting it. This does not impair the uniformity of the appearance of the finished product.

FIGS. 6A and 6B are explanatory views of a sixth embodiment of the cathode ray tube according to the present invention, wherein FIG.
Is a front view as viewed from the panel unit 1 side. In this embodiment, connecting portions welded by the auxiliary plates 14A, 14B, 14C and 14D are provided at the four corners of the metal strip forming the reinforcing metal fitting 14. Four metal strips and four auxiliary plates are prepared.

Also in this embodiment, since there is no directionality in the vertical position with respect to the panel section 1, it can be put into the work process at any position, and no wrong direction occurs when putting it. This does not impair the uniformity of the appearance of the finished product.

The present invention can be similarly applied to various kinds of cathode ray tubes requiring a reinforcing bracket, that is, a monochromatic cathode ray tube, a color cathode ray tube, a projection type cathode ray tube, and a cathode ray tube for other special uses.

In the projection type cathode ray tube, the lug may be attached at a position slightly shifted from the corner of the panel.
Some other cathode ray tubes have lugs mounted at positions away from corners depending on the application. However, in any case, the difference in the insertion of the reinforcing metal can be avoided by applying the above-described embodiments.

[0031]

As described above, according to the present invention,
Since there is no direction in the reinforcing bracket above and below the panel part of the cathode ray tube, it is not necessary to judge the direction one by one and insert it.
Work efficiency is improved. In addition, the present invention provides a cathode ray tube having a uniform appearance in a finished product, in which the reliability of mounting work of the reinforcing bracket is improved, for example, the heating conditions of the burner for uniformly heating the reinforcing bracket are uniform. Can be.

[Brief description of the drawings]

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

FIG. 2 is an explanatory view of a second embodiment of the cathode ray tube according to the present invention.

FIG. 3 is an explanatory view of a third embodiment of the cathode ray tube according to the present invention.

FIG. 4 is an explanatory view of a fourth embodiment of the cathode ray tube according to the present invention.

FIG. 5 is an explanatory view of a fifth embodiment of the cathode ray tube according to the present invention.

FIG. 6 is an explanatory view of a sixth embodiment of the cathode ray tube according to the present invention.

FIG. 7 is a schematic sectional view illustrating a schematic structure of a shadow mask type color cathode ray tube as an example of a cathode ray tube.

FIG. 8 is an explanatory view of a shape and an attached state of a conventional reinforcing metal fitting used for a cathode ray tube.

FIG. 9 is a cross-sectional view of a lug attachment portion taken along line AA in FIG. 8 (b).

[Explanation of symbols]

 1 Panel 2 Funnel 3 Neck 14 Reinforcement 14 (14A, 14B, 14C, 14D) Auxiliary plate 15 Lug.

Claims (4)

[Claims] 1. A substantially rectangular panel portion having a phosphor surface coated with a phosphor on its inner surface, a neck portion accommodating an electron gun, and an electron beam emitted from the electron gun connecting the panel portion and the neck portion. A vacuum envelope with a funnel part equipped with a deflection yoke for scanning on the phosphor screen, and a reinforcing metal member formed of an annular metal strip tightened around the periphery of the panel part, When viewed in the plane of the circling surface of the reinforcing member with respect to the panel portion, the reinforcing member has two opposing surfaces of the panel portion.
A cathode ray tube characterized by being non-directional with respect to any of the sides. 2. The cathode ray tube according to claim 1, wherein the metal strip has a seamless annular shape that is continuous over the entire circumference. 3. The metal strip has an annular ring shape having a connection portion at one of two opposing sides thereof at a point symmetric position with respect to the center of the plane of the orbiting surface. A cathode ray tube according to claim 1. 4. The cathode ray tube according to claim 1, wherein said metal strip has an annular ring shape having connection portions at four corners where two opposing sides intersect.