JPH054199Y2 - - Google Patents

Description

[Detailed Description of the Invention] (A) Field of Industrial Application This invention relates to a flat fluorescent lamp suitable for backlighting of liquid crystal display devices and the like, and in particular to a chipless flat fluorescent lamp.

(b) Prior Art Generally, an electron tube such as a flat fluorescent lamp has an exhaust pipe called a chip tube installed in a part of its container.
After the gas inside the container was suctioned and exhausted through the tip tube, the tip tube was melted and sealed.

However, since the tip tube protrudes from the container, the space factor is poor, and since the tip tube is made of glass, it has low impact resistance.

For this reason, an electron tube that evacuated the inside of the container without using a chip tube by providing an exhaust hole in the container and sealing the exhaust hole with a lid member through a fritted glass inside the vacuum chamber was disclosed in Japanese Patent Laid-Open No. 62-177840, for example. It has been proposed in Publication No. (H01J29/86).

However, since the electron tube has an exhaust hole in the plane of the flat glass, it is necessary to make holes in the glass plate using an ultrasonic cutter or the like, resulting in poor productivity and high cost. Furthermore, when applied to a flat fluorescent lamp, there is a drawback that the effective light emitting area becomes narrow.

(c) Problems to be solved by the invention This invention has been created in view of the above points.
To provide a flat fluorescent lamp that does not require drilling to provide an exhaust hole and does not reduce its effective light emitting area.

(d) Means for Solving the Problems In the present invention, an exhaust hole is formed by dividing the spacer glass on one side of the container into two parts and making them face each other at a predetermined distance, and at the same time, the exhaust hole is closed by a lid member. It becomes.

(e) Effect After the air inside the container is exhausted from the exhaust hole by the above-mentioned means, it is closed by the lid member.

(C) Embodiment An embodiment of the present invention will be described below with reference to the drawings.

Figure 1 A, B, and C are a perspective view, a side view, and a front view of the flat fluorescent lamp of this embodiment.
are a pair of flat glasses, and 3, 4, . . . are thin plate-shaped spacer glasses that maintain a predetermined distance between the pair of flat glasses, and these constitute the container 5. The spacer glasses 3, 3 on one side of the container 5 are divided into two parts facing each other with a predetermined interval, and an exhaust hole 6 is formed in the center. 7
A circular lid member is welded and closed from the outside of the exhaust hole 6 by frit glass 8, and is made of an alloy or the like having substantially the same coefficient of expansion as glass.

Next, a method for manufacturing the flat fluorescent lamp of this embodiment will be explained.

First, a pair of flat glasses 1, 2 and spacer glasses 3, 4, . . . are welded together using frit glass 8 to form a weld 5.

Next, the container 5 is placed in a chamber having a reduced pressure argon gas atmosphere of 1 to 20 Torr, and a cover member 7 having frit glass 8 attached thereto is pressed against the exhaust hole 6 in the chamber so as to close the exhaust hole 6.
The tube is heated and melted to seal it.

Figures 2A and 2B show other embodiments of the present invention, in which the lid member 9 has a U-shaped cross section and is attached so as to sandwich the edges of the flat glasses 1 and 2. The lid member 9 can be more firmly fixed.

Further, FIGS. 3A and 3B show still another embodiment of the present invention, in which a metal protrusion 10a is provided on the inside of the lid member 10.
is provided, and a mercury getter 11 is spot-welded to its tip.

(g) Effects of the invention As described above, according to the invention, no drilling is required to provide an exhaust hole, so productivity is good and costs are not high.

Furthermore, since the exhaust holes are formed on the spacer glass side, the effective light emitting area is not narrowed.

[Brief explanation of the drawing]

Figure 1 A, B, and C are perspective views, side views, and front views of a flat fluorescent lamp according to an embodiment of the present invention;
Figures A and B are a side view and a front view of a flat fluorescent lamp in another embodiment, and Figures A and B are a side view and a front view. 1, 2... Flat glass, 3, 4... Space glass, 5... Container, 6... Exhaust hole, 7, 8, 9...
...Lid member.

Claims (1)

[Claims for Utility Model Registration] In a flat fluorescent lamp in which a container is constituted by a pair of flat glasses and a plurality of spacer glasses that hold the flat glasses at a predetermined distance, one side of the container A planar fluorescent lamp in which an exhaust hole is formed by dividing the spacer glass into two parts and making them face each other at a predetermined distance, and the exhaust hole is closed by a lid member.