JP2555356Y2 - Exhaust device for fluorescent display tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an exhaust device for a fluorescent display tube, and more particularly to a structure of an exhaust head of an exhaust device for a fluorescent display tube without an exhaust tube.

[Conventional technology]

Conventionally, in an exhaust device for a fluorescent display tube of this type, as shown in FIG.
, And the inside of the fluorescent display tube 1 is evacuated to a vacuum by the exhaust head 10, and the fluorescent display tube 1 is made uniform by the heater 5 in the furnace frame 11 via the metal plate 4 having a flat surface. After heating, the exhaust hole 2 of the fluorescent display tube 1 was sealed with a lid member 7 supported by a movable heater 6.

[Problems to be solved by the invention]

In the exhaust head 10 of this conventional exhaust device, since the surface of the metal plate 4 for uniformly heating the fluorescent display tube 1 from below is flat, glass chips, metal chips, and the like on the metal plate 4 adhere to the lid member 7. Alternatively, the adhesion to the O-ring 3 of the exhaust head 10 causes a leak, or the heat capacity of the metal plate 4 is so large that rapid heat quenching is difficult. There is a drawback that it causes a decrease in work efficiency and a decrease in yield.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an exhaust device for a fluorescent display tube that prevents the occurrence of a leak and enables rapid heating and rapid cooling.

[Means for solving the problem]

In order to achieve the above object, an exhaust device for a fluorescent display tube according to the present invention is an exhaust device for a fluorescent display tube that has an exhaust head and a metal plate, and evacuates the inside of the fluorescent display tube. The inside is a hollow glass hermetic container having an exhaust hole provided on an end face thereof. The exhaust head is sealed with an O-ring between the fluorescent display tube and an exhaust hole of the fluorescent display tube. The metal plate is connected to and evacuates the fluorescent display tube, and the metal plate is arranged to face the end face of the fluorescent display tube where the exhaust hole is provided, and uniformly transfers the heat of the heater to the fluorescent display tube. And has a groove or a through hole, and the groove or the through hole captures or discharges glass dust or the like on the metal plate.

[Action]

The metal plate 4 discharges glass dust and the like generated from the fluorescent display tube 1 through the groove 8 or the through hole 9. For this reason, metallic glass chips and the like do not adhere to the lid member 7 or the O-ring 3, and the occurrence of a leak can be prevented.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

(Embodiment 1) FIG. 1 is a longitudinal sectional view showing Embodiment 1 of the present invention.

In the figure, a fluorescent display tube 1 is an airtight container in which flat glass is assembled in a thin box shape, and has an exhaust hole 2 for vacuum exhaust on one surface.

The exhaust head 10 has a metal cylindrical shape, and has a vacuum hole 10 at the tip thereof facing the exhaust hole 2 of the fluorescent display tube 1.
a is provided, and an annular stepped portion 10b for locking the O-ring 3 is provided on the outer peripheral edge of the vacuum hole 10a. The metal plate 4 is made of aluminum or titanium, and has a plurality of grooves 8 formed on the front and back surfaces.

Further, the metal plate 4 is provided with a large-diameter hole 4a for receiving the step portion 10b of the exhaust head 10. The hole 4a of the metal plate 4 is inserted into the hole 4a of the exhaust head 10 so that the hole of the metal plate 4 is formed. An annular O-ring receiving groove 12 is formed between the inner peripheral side of 4a and the outer peripheral side of the step portion 10b of the exhaust head 10. The metal plate 4 is integrally connected to the exhaust head 10 by welding or screws. The O-ring 3 is fitted and held in the annular receiving groove 12. It goes without saying that the dimensions of the groove 12 are designed according to the dimensions recommended in JIS B2406.

The end of the exhaust head 10 opposite to the vacuum hole 10b is connected to an exhaust pump (not shown), and the movable heater 6 is incorporated at a central position in the exhaust head 10.

The movable heater 6 is housed in the exhaust head 10 in an airtight manner. 11 is a furnace frame and 5 is a heater.

The fluorescent display tube 1 is a glass hermetic container in which a display surface glass and a substrate glass are sealed with low melting point glass, and the fluorescent display tube 1 is displayed on the center of the vacuum hole 10a of the exhaust head 10. An O-ring 3 is interposed between the fluorescent display tube 1 and the exhaust head 10 so that an exhaust hole 2 provided on the glass surface or the substrate glass surface is located. When the exhaust pump connected to the exhaust head 10 operates, the inside of the fluorescent display tube 1 is evacuated to a vacuum through the vacuum hole 10a of the exhaust head 10. The fluorescent display tube 1 is heated using a heater 5 in order to efficiently exhaust gas during exhaust. As shown in FIG. 1, the metal plate 1 is disposed facing one end face of the fluorescent display tube 1 where the exhaust hole 2 is provided.
The metal plate 1 has a function of receiving the heat of the heater 5 at the time of heating by the heater 5 and uniformly transferring the heat of the heater 5 to the fluorescent display tube 1.

After a predetermined evacuation time has elapsed, the movable heater 6 is energized to heat the lid member 7 previously coated with low-melting glass, and the lid member 7 is raised to raise the movable heater 6 and exhaust the fluorescent display tube 1. The movable heater 6 is pressed down by pressing the movable heater 6 off, and the movable heater 6 is lowered. The exhaust hole 2 of the fluorescent display tube 1 is hermetically sealed by the lid member 7 so that the vacuum can be maintained.

By the way, when the fluorescent display tube 1 is detached from the metal plate 4, debris such as substrate glass constituting the fluorescent display tube 1 falls on the metal plate 4.

The metal plate 4 according to the present invention has a groove 8 on its surface, so that glass chips and metal chips fall into the grooves of the metal plate 4 and are trapped. Is prevented from adhering to the surface as foreign matter.

(Embodiment 2) FIG. 2 is a longitudinal sectional view showing Embodiment 2 of the present invention.

In this embodiment, a through hole 9 is provided in the metal 4 instead of the groove 8.

According to the present embodiment, glass chips and the like generated from the fluorescent display tube 1 fall into the through holes 9 of the metal plate 4 and pass through the through holes 9 and are discharged to the lower part of the furnace frame 11. Is prevented from adhering to the lid member 7 and the O-ring 3 as foreign matter.

[Effect of the invention]

As described above, the present invention has a groove or a through hole in a metal plate for heating a fluorescent display tube, so that glass chips and metal chips on the upper surface of the metal plate fall into the groove or the through hole, and the lid member and the O-ring Adhesion of foreign matter to the surface is reduced, and leakage can be prevented. In addition, since the metal plate is grooved and drilled, the weight of the metal plate is reduced, and the surface area is increased. This has the effect of improving work efficiency and yield.

[Brief description of the drawings]

1 is a longitudinal sectional view showing a first embodiment of the present invention, FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention, and FIG. 3 is a longitudinal sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Fluorescent display tube 2 ... Exhaust hole 3 ... O-ring 4 ... Metal plate 5 ... Heater 6 ... Movable heater 7 ... Lid member 8 ... Groove 9 ... Through hole 10 Exhaust head 11 Furnace frame

Claims (1)

(57) [Scope of request for utility model registration] 1. An exhaust device for a fluorescent display tube having an exhaust head and a metal plate and evacuating the inside of the fluorescent display tube, wherein the fluorescent display tube is an airtight container made of glass having a hollow interior and an end face. The exhaust head is sealed with an O-ring between the fluorescent display tube and the exhaust head, is connected to the exhaust hole of the fluorescent display tube, and evacuates the inside of the fluorescent display tube. The metal plate is disposed to face the end face of the fluorescent display tube where the exhaust hole is provided, uniformly transfers the heat of the heater to the fluorescent display tube, and has a groove or a through hole. The exhaust device for a fluorescent display tube, wherein the groove or the through hole captures or discharges glass dust or the like on the metal plate.