JPH02257563A - Flat type fluorescent lamp - Google Patents

Abstract

PURPOSE:To make an exhaust pipe in large dia., enhance its mechanical strength, and increase the rate of exhaust flow by constructing the exhaust pipe, which penetrates part of the side wall of a flat sealed vessel, with a pene trating part in substantially rectangular profile. CONSTITUTION:An exhaust pipe 23 penetrates a spacer frame (side wall of sealed vessel) 14, wherein the penetrating part 23a of the pipe is formed in rectangular profile. The length of this rectangle across its width shall be widened in the longitudinal direction of the spacer frame 14 so as to enlarge the opening area of the penetrating part 23a, that allows both enlargement of the rate of exhaust flow in the penetrating part 23a and enhancement of the exhaust gas speed. Further the exhaust pipe 23 can be embodied as a circu lar tube having a diameter at the exterior end 23b in circular tube form greater than the height t1 of the spacer frame 14, i.e., a diameter greater than the internal distance d1 between the front plate 12 and back plate 13, that should permit enhancement of the mechanical strength at the outside end 23b.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a flat fluorescent lamp suitable for backlighting a liquid crystal display panel such as a liquid crystal television from the back side. This invention relates to a flat fluorescent lamp with an improved tube.

(Prior art) Conventionally, this type of flat fluorescent lamp was developed in Japanese Patent Application Laid-open No. 6
There is one shown in Japanese Patent No. 2-208537.

This flat fluorescent lamp 1 is constructed as shown in FIGS. 8 to 11, and includes a front plate 2 made of a single transparent plate glass and a back plate 3 made of a single plate glass of the same shape and size. Both plates 2 are arranged concentrically and facing each other.
, 3, a glass spacer frame 4 assembled into a rectangular frame is airtightly interposed and fixed to form a flat sealed container 5 having a flat rectangular cylindrical shape.

The flat airtight container 5 has a pair of electrodes 5a and 5b, such as a hollow cathode type cold cathode, disposed facing each other and separated from each other. is formed.

The air inside the flat airtight container 5 is exhausted through a circular exhaust pipe 8, and through this exhaust pipe 8, at least one of xenon, clear air, argon, neon, helium, etc. is introduced into the flat airtight container 5. One kind of rare gas, or in some cases this rare gas and a predetermined m of mercury, is sealed.

(Problems to be Solved by the Invention) However, such a conventional flat fluorescent lamp 1 has a problem in that the exhaust pipe 8 is a circular tube with a small diameter and has low mechanical strength.

That is, the exhaust pipe 8 made of a circular pipe passes airtightly through the square columnar glass spacer frame 4 forming the side wall of the flat closed container 5 in the direction perpendicular to the axis, so that the diameter of the exhaust pipe 8 is as shown in FIGS. 9 and 12. As shown in , the plate thickness d of the prismatic spacer frame 4,
regulated by.

The plate thickness d1 is the inner distance between the front plate 2 and the back plate 3, and is approximately 31 fi1 for boat fishing, for example. By reducing the plate thickness d1, the flat fluorescent lamp 1 can be Since the exhaust pipe 8 can be made thinner, the diameter of the exhaust pipe 8 decreases as the exhaust pipe 8 becomes thinner, and its mechanical strength decreases.

For this reason, the conventional exhaust pipe 8 has no choice but to be inferior and its mechanical strength is low, so by connecting an exhaust device to the outer end of the exhaust pipe 8, etc. In the exhaust process, etc., the exhaust pipe 8 may develop cracks.

Furthermore, since the exhaust pipe 8 has a small diameter, the exhaust flow rate is small and the exhaust process takes time.

Further, as shown in FIG. 12, a square through hole 4a of the spacer frame 4 through which the exhaust pipe 8 passes, and a circular exhaust pipe 8 are provided.
Since a gap 9 is created between the penetrating part and the outer circumferential surface of the penetrating part, this gap 9 must be filled with, for example, frit glass 10 and hermetically sealed. be.

Therefore, the present invention has been made in consideration of the above circumstances, and its purpose is to increase the mechanical strength of the exhaust pipe and increase the exhaust flow rate of the flat fluorescent lamp. Our goal is to provide the following.

[Structure of the invention]

(Means for Solving the Problems) In the present invention, the axial cross-sectional shape of the penetration part of the exhaust pipe that airtightly communicates with a part of the side wall of the closed container is formed into a square shape, and is configured as follows. be done.

Specifically, the present invention provides a flat fluorescent lamp having an exhaust pipe that airtightly penetrates a part of the side wall of a flat sealed container that forms a flat discharge space therein, and communicates the inside and outside of the flat sealed container. It is characterized in that the axial cross-sectional shape of the penetration part of the exhaust pipe that penetrates a part of the side wall of the flat airtight container is formed into a square shape.

(Function) 5 Since the axial cross-sectional shape of the penetration part of the exhaust pipe that airtightly penetrates a part of the side wall of the sealed container is approximately square, the width of the square of the penetration part is adjusted in the longitudinal direction of the side wall of the sealed container. The opening area of the through-hole can be enlarged by appropriately widening the opening area along the line, thereby increasing the exhaust flow rate and shortening the exhaust process time.

Furthermore, the diameter of the outer end of the exhaust pipe that airtightly penetrates a part of the side wall of the sealed container and extends to the outside can be increased without being restricted by the height of the side wall of the sealed container. Therefore, the mechanical strength of the exhaust pipe can be improved.

(Example) An example of the present invention will be described below based on FIGS. 1 to 7.

FIG. 1 is an exploded perspective view showing the overall configuration of an embodiment of the present invention. In the figure, a flat fluorescent lamp 11 is a fluorescent lamp suitable for backlighting an LCD panel of an LCD TV or the like from the rear. A front plate 12 made of a single transparent glass plate and a back plate 13 made of a single glass plate of the same shape and size are arranged concentrically and facing each other.

In addition, a spacer frame 14 made of glass and having a rectangular frame is airtightly interposed and fixed between the outer peripheries of both plates 12 and 13, and a flat rectangular box-shaped spacer frame 14 is fixedly interposed between the outer peripheries of both plates 12 and 13. It constitutes a closed container 15.

! 7 r7111 M 15 has a pair of electrodes 16a and 16b of, for example, a follow cathode and a cathode shade disposed inside thereof and spaced apart from each other, and these pair of electrodes 16
A discharge space 17 in which discharge is caused between a and 16b is formed into a substantially flat shape.

As shown in FIG. 4, the front plate 12 has a fluorescent film 18 coated almost entirely on its inner surface, and its outer surface serves as a light-emitting surface, while the back plate 13 has a light-diffusing film 19 and a light-reflecting film on its inner surface. The film 20 is applied in two layers, upper and lower.

The front plate 12 and the back plate 13 are made of glass frit 21 with a low melting point on the front (top surface in FIG. 1) and back surface (bottom surface in FIG. 1) of the spacer frame 14, respectively. are joined to form a thin rectangular box-shaped airtight container 15.

Further, the pair of electrodes 16a, 16b has a pair of lead pieces 22a, 22b integrally extending outward in the axial direction from one end thereof in the axial direction, and the tips of each lead piece 22a, 22b are directed to the outside of the sealed container 15. It extends airtight and is connected to a power source (not shown).

An exhaust pipe 23 is provided through a part of the spacer frame 14 forming the gsg of the sealed container 15 configured in this way, and the air inside the sealed container B15 is exhausted through the exhaust pipe 23. , @xenon in the closed container 15,
At least one kind of rare gas such as krypton, argon, neon, helium, etc., or in some cases mercury of a predetermined quality of this rare gas, is sealed.

The exhaust pipe 23 is connected to the spacer frame 14 as shown in FIG.
It has a penetrating portion 23a for passing through, and an outer end portion 23b extending horizontally to the outside from the spacer frame 14.

That is, the exhaust pipe 23 is shown in FIGS. 5(A) and 5(B).

(C), as shown in FIGS. 6 and 7, the axial cross-sectional shape of the penetrating portion 23a is formed into a quadrangular rectangular parallelepiped, and the outer diameter end 23b of ( As shown in FIG. 2, the spanner frame 14 is formed into a circular tube shape with a diameter larger than the height t1, that is, the inner distance d between the front plate 12 and the rear pluto 13.

The width of the rectangular penetrating portion 23a of the exhaust pipe 23 is expanded in the longitudinal direction of the spacer frame 14, and the exhaust pipe 23 is
The width is longer than the diameter of the circular tube portion 23b of No. 3,
The opening area of the penetrating portion 23a is expanded to increase the exhaust flow rate.

Next, the operation of this embodiment will be explained.

In the flat fluorescent lamp 1 configured as described above, when a predetermined voltage is applied between the pair of electrodes 16a and 16b, a glow discharge is generated between the pair of electrodes 16a and 16b, and this glow discharge causes the inside of the closed container 15 to be Mercury atoms are excited and produce ultraviolet light.

This ultraviolet light excites the fluorescent film 18 of the front plate 12a, is converted into visible light, and is irradiated from the light emitting surface on the outer surface of the front plate 12.

Furthermore, the ultraviolet rays generated inside the airtight container 15 are diffusely reflected by the light diffusing film 19 of the back plate 13 and the light reflecting film F122, and are guided to the fluorescent film 18 side of the front plate 12, where they are further emitted. The luminous efficiency is increased.

Therefore, the entire light emitting surface of the front plate 12 emits light almost uniformly, so there is little unevenness in brightness.

In the exhaust pipe 23, the axial cross-sectional shape of the penetration part 23a that penetrates the spacer frame 14 is formed into a square rectangular parallelepiped, and the width direction length of the square is expanded along the length direction of the spacer frame 14. Since the opening area of the penetrating portion 23a is expanded, it is possible to both enlarge the exhaust gas 11ffi in the penetrating portion 23a and improve the exhaust speed.

Furthermore, the exhaust pipe 23 has a diameter of its circular tubular outer end 23b equal to the height t1 of the spacer frame 14, that is, the outer brake 1.
12 and the back plate 13, the mechanical strength of the outer end portion 23b can be improved.

Therefore, even when the outer end 23b of the exhaust pipe 23 is connected to an exhaust device (not shown) to exhaust the air inside the closed container 15, the mechanical strength of the outer end 23b of the exhaust pipe 23 is improved. , it is possible to reduce the occurrence of cracks or the like in the outer end portion 22b of the exhaust pipe 23 during the exhaust process.

Furthermore, since the penetrating portion 23a of the exhaust pipe 23 has a square shape, air can be airtightly injected into the square-shaped one through hole 14a of the spacer frame 14, as shown in FIG. 7, and positioning can be facilitated. can be done.

In addition, since the rectangular n-recessed part 23a of the exhaust pipe 23 can be tightly fitted into the square n-through hole 14a of the spacer frame 14, the use of, for example, frit glass to seal these inserted parts is suppressed. At the same time, it is possible to improve the small surface of the airtight seal of the fitting portion.

〔Effect of the invention〕

As explained above, in the present invention, the axial cross-sectional shape of the exhaust pipe passage that airtightly passes through a part of the side wall of the m-tight container is formed into a rectangular shape. Sao,
The airtight container can be widened without being restricted by the height of the side wall, and the area of the exhaust hole can be increased.

Furthermore, since the diameter of the outer end of the exhaust pipe extending outward from the side wall of the sealed container can be made larger than the height of the side wall of the sealed container, its mechanical strength can be improved and , the area of the exhaust hole can be expanded.

Therefore, it is possible to improve the mechanical strength of the outer end of the exhaust pipe, so even when the outer end of the exhaust pipe is connected to an exhaust device and exhaust is performed, the outer end of the exhaust pipe is This can reduce the occurrence of cracks in the parts.

Furthermore, since the exhaust hole area of both the through-hole and outer end of the exhaust pipe can be expanded, the exhaust flow can be expanded and the exhaust speed can be increased, reducing the exhaust process time. can be achieved.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the overall configuration of an embodiment of a flat fluorescent lamp according to the present invention, FIG. 2 is a plan view of FIG. 1 when assembled, and FIG. 3 is a front view of FIG. 1. Figure 4 shows the rV of Figure 2.
-IV line sectional view, FIG. 5(A). (B) and (C) are a plan view, side view, and front view of the exhaust pipe shown in FIG. 1; FIG. 6 is a side view of the main part of the embodiment shown in FIG. 1;
7 is a front view of one embodiment shown in FIG. 1, FIG. 8 is an exploded perspective view showing the overall structure of a conventional flat fluorescent lamp, and FIG.
The drawings are a plan view showing the assembled state of FIG. 8, a front view of FIG. 9, and a partially enlarged view of FIG. 10 showing the vicinity of the first tube. 11... Flat fluorescent lamp, 14... Spacer frame (
Side wall of sealed container), 15... Sealed container, 17... Discharge space, 23... Exhaust pipe, 23a... Penetration part, 23
b...Outer end.

Claims (1)

[Claims] In a flat fluorescent lamp having an exhaust pipe that airtightly penetrates a part of the side wall of a flat sealed container that forms a flat discharge space inside and communicates the inside and outside of the flat sealed container, one of the side walls of the flat sealed container is provided. A planar fluorescent lamp characterized in that the axial cross-sectional shape of the passage of the exhaust pipe that penetrates the part is formed into a substantially rectangular shape.