JPH10302637A - Sealing device of cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the productivity and cope with a complicated demand change by constituting a rotating device in such a manner that a major diameter cathode-ray tube is sealed by use of a sealing holder corresponding to the bulb neck diameter, and a minor diameter cathode-ray tube is sealed by use of a sealing holder off-centered so that the circumference of the neck part of the minor diameter cathode-ray tube touches one burner of the major diameter cathode-ray tube. SOLUTION: Each sealing holder 11 on a turntable 10 turns on its axis to heat a cathode-ray tube neck part 1A installed to the sealing holder 11 by the flame 21 from a gas burner 20. The sealing holder 11 having a minor diameter cathode-ray tube neck part 1B installed thereto is off-centered from the rotation center 12A of the major diameter cathode-ray tube sealing holder and situated in 12B, and the circumference of the neck part 1B turns on its axis and revolves, drawing the same orbit as the circumference of the neck part 1a of the major diameter cathode-ray tube. Therefore, the heating can be performed also in the same burner position in the sealing of the minor diameter cathode-ray tube to facilitate the burner management condition, and the quality of product can be stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cathode ray tube sealing device for sealing a glass bulb having a fluorescent screen formed therein and a stem assembly on which an electron gun assembly is mounted.

[0002]

2. Description of the Related Art Generally, in a manufacturing process of a color cathode ray tube, after a fluorescent screen, graphite, a shadow mask and the like are mounted inside a panel portion of a glass bulb, a stem portion having an electron gun assembly mounted on an opening end of a glass bulb neck portion is formed. Sealed.
Such sealing is disclosed, for example, in Japanese Patent Publication No. 53-31595. For sealing such a cathode ray tube, a sealing device for a cathode ray tube described below is used.
FIG. 2 is a plan view of a main part showing an example of a commonly used device for sealing a cathode ray tube. In the figure, on the outer peripheral end of a disk-shaped turntable 10, a large number of sealing holders 11 for holding the above-mentioned glass bulb around the tube axis are regularly arranged at regular intervals. Reference numeral 11 is rotated at a predetermined speed in the direction of arrow A by an automatic driving device (not shown), and these sealing holders 11 are accurately moved to predetermined positions at predetermined time intervals by an index driving device (not shown). Therefore, in each of the sealing holders 11 on the turntable 10, normally # 1 to # 2 are located at positions for mounting and removing the glass bulb,
3 to # 8 perform preheating of the valve neck portion and the sealing portion, welding of the valve neck portion in # 9, fusing in # 10, cooling in # 11 to # 15, and fusing in # 16. A neck tube piece (usually called cullet glass) separated from the valve neck portion is removed. The configuration of the sealing holder is a general one,
No. 219434.

[0003]

Generally, two types of cathode ray tubes include a cathode ray tube having a bulb neck portion having an outer diameter of 29.1 mm (hereinafter referred to as 29φ neck diameter) and a cathode ray tube having a 22.5 mm diameter (hereinafter referred to as 22φ neck diameter). Neck diameter) and 38
There are various types such as φ neck diameter. Recently, the demand ratio of these neck diameters is unstable.
A dedicated sealing device for each of the 9φ neck diameter and the 22φ neck diameter is provided, and although having a total sealing processing capability, the sealing processing capability is reduced depending on the demand ratio between the 29φ neck diameter and the 22φ neck diameter, for example. There was a problem of lack of ability. To deal with this problem,
As disclosed in Japanese Patent No. 9434, there is an embodiment in which a burner is switched to perform heating processing. However, there is a problem that each burner must be managed and it takes time and effort in management. Considering that, it is necessary to ignite even a burner not used for processing, and there was a problem in terms of operation cost.

[0004]

The sealing device for a cathode ray tube according to the present invention seals a large-diameter cathode ray tube (for example, a 29φ diameter) using a sealing holder corresponding to the bulb neck diameter.
When sealing the small-diameter cathode ray tube (for example, 22φ diameter), the burner of the large-diameter cathode ray tube was used as it was, and the center of rotation was decentered so that the outer periphery of the neck portion of the small-diameter cathode ray tube hit one of the burners. The rotating device is constituted by the sealing holder.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION The outer periphery of a valve neck diameter is exposed to a burner flame by rotation of a sealing holder.
In the case of the small-diameter cathode ray tube sealing, the large-diameter cathode ray tube sealing (for example, 29
φ) Heated at the same burner position as the outer periphery of the neck and revolved along the trajectory of the outer periphery of the large-diameter cathode ray tube neck (that is, the outer circle of the neck portion of the small-diameter cathode ray tube is the neck of the large-diameter cathode ray tube) The inner circle is the circumcircle of the inner circle and rotates.

[0006]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a plan view of an essential part showing an embodiment of a device for sealing a cathode ray tube according to the present invention, and the same parts as those in FIG. 2 are denoted by the same reference numerals. In FIG. 2, each of the sealing holders 11 on the main table 10 rotates between # 3 and # 15, and a 29φ diameter cathode ray tube neck 1 mounted on the sealing holder 11 by a flame 21 output from a gas burner 20.
A is heated and processed. The sealing holder 11 to which the 22φ diameter cathode ray tube neck portion 1B is mounted is eccentric from the rotation center 12A of the 29φ diameter cathode ray tube sealing holder at 12B. Rotate and revolve. Therefore, the processing can be performed by only one set of the processing burners 20. In the above-mentioned embodiment, the dual burner system of the 29φ and 22φ systems has been described, but it is needless to say that the present invention can be applied to other systems.

[0007]

As described above, according to the present invention, since a plurality of glass bulbs having different glass bulb neck diameters can be continuously heated, the production margin is greatly improved, and complicated demands are achieved. An extremely excellent effect that it can easily cope with the fluctuation is obtained. In addition, since it is not necessary to prepare machining burners for the number corresponding to each neck diameter,
The control of the burner conditions is facilitated, and the excellent effect that the product quality is largely stabilized is produced. Further, since there is no useless burner ignition when not in use, the effect of reducing running costs is great. On the equipment side, the number of burners is reduced, so that the cost during equipment manufacturing can be reduced.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part of a cathode-ray tube sealing device according to an embodiment of the present invention.

FIG. 2 is a main part plan view showing a general cathode ray tube sealing device.

[Explanation of symbols]

1A Glass bulb neck part with 29φ neck diameter 1B Glass bulb neck part with 22φ neck diameter 10 Turntable 11 Sealing holder 12A Sealing holder rotation center with 29φ neck diameter (22φ
12B 22φ Neck diameter seal holder rotation center 20 Gas burner 21 Flame

Claims (3)

[Claims] 1. A sealing holder for holding a glass bulb at the center of a tube axis, a mount pin for holding an electron gun assembly mounted on a stem assembly disposed in the glass bulb neck, and the stem assembly and the glass bulb neck. A sealing device for a cathode ray tube, comprising: a heating device for heating, welding and sealing the glass tube, wherein the heating device arranges a burner at a fixed angle regardless of the size of the glass bulb neck diameter. A sealing device for a cathode ray tube, characterized in that a glass bulb tube axis is eccentric to seal while keeping a burner heating condition constant. 2. A sealing holder which revolves by inscribing a small diameter cathode ray tube neck having a rotation axis at a position eccentric from the rotation axis of the large diameter cathode ray tube neck to an inner circumferential circle of the large diameter cathode ray tube neck. 2. A device for sealing a cathode ray tube according to claim 1, further comprising a sealing burner which can be heated in common to different diameter neck diameters. 3. The large-diameter cathode ray tube neck portion has a diameter of 29.1.
mm, and the diameter of the small-diameter cathode ray tube neck is 22.5 mm.
3. The sealing device for a cathode ray tube according to claim 2, wherein