JPH02181356A - Electric lamp - Google Patents

Abstract

PURPOSE:To prevent the generation of cracks due to the concentration of stress in a glass member by providing notches on the outer end portion of an electrode lead. CONSTITUTION:On respective outer end portions 21a of a pair of electrode leads 21, for instance, circular arc notches 22 of specified depth are provided on the both sides. Therefore when a bending moment is applied to the outer end portion 21a of an electrode lead 21 in the direction of the arrows nearly perpendicular to the front and the rear surface, the stress generated in the electrode lead 21 is absorbed and dispersed by the circular notches 22, and the concentration of the stress to the periphery of the passing through portion A of the electrode lead 21 in the frit glass 7 can be prevented. Thereby the generation of cracks in the frit glass 7, the spacer 3, the front plate 1a and the rear plat 2 around the passing through portion A can be prevented.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention relates to an electric lamp that is led out to the outside by passing a glass member through one end of an electrode lead in an airtight manner, and is particularly applicable to a liquid crystal television or the like. The present invention relates to an electric lamp with improved electrode leads, such as a flat fluorescent lamp suitable for backlighting a liquid crystal display panel from the rear.

(Prior art) In recent years, LCD televisions have been developed and are becoming more popular.This type of LCD television requires an LCD panel to display the TV image and a backlight to illuminate the panel from the back. Therefore, the function of illuminating the entire display surface of a predetermined area with a certain brightness is required.

Conventionally, such backlights are made by arranging one or more U-shaped fluorescent lamps or small straight tube fluorescent lamps in parallel, and combining them with a light reflecting surface, a light diffusing surface, etc., to create various planar shapes. Some devices are designed to obtain a brightness distribution.

However, in devices that use a plurality of such fluorescent lamps, it is inevitable that the brightness near the lamps will be higher than other parts, and it is difficult to eliminate overall brightness unevenness.

In addition, since multiple fluorescent lamps are used, the structure for holding these lamps and the structure for connecting the power supply become complicated, which increases the number of parts, increases the size of the fixture, and in particular increases the thickness of the backlight itself, making it thinner. There is a drawback that it cannot be changed.

To solve this problem, Japanese Patent Laid-Open No. 62-
A flat fluorescent lamp as shown in Japanese Patent No. 208537 has been proposed.

This flat fluorescent lamp 1 is constructed as shown in FIGS. 7 to 10, and includes a front plate 1a made of a single transparent plate glass, and a back plate 2 made of a single plate glass of the same shape and size. , has a glass spacer 3 assembled into a rectangular frame having the same shape and size as the outer peripheral edge of these plates 1.2.

As shown in FIG. 10, the front plate 1a has a fluorescent film 4 coated almost entirely on its inner surface, with its outer surface serving as a light emitting surface, and the back plate 2 has a light diffusing film 5 and a light reflecting film 6 on its inner surface. are applied in two layers, upper and lower.

The front plate 1a and the back plate 2 are provided with a low melting point glass frit 7 at the front opening and rear opening of the spacer 3.
They are each hermetically joined to form a thin box-shaped sealed container 18 as shown in FIGS. 8 to 10.

Therefore, the front plate 1a faces the back plate 2 with the spacer 3 in between, and a discharge space 9 is formed between the two plates 1.degree.

In this discharge space 9, a pair of electrodes 10, 10, such as a hollow cathode type cold cathode, are arranged facing each other and spaced apart from each other. , these mouth-shaped openings are opposed to each other.

Further, the pair of electrodes 10.10 has a pair of metal band-shaped lead pieces 11.11 integrally extending outward in the axial direction from one end in the axial direction, and the tip of each lead piece 11 is connected to the airtight container 8. The glass frit 7 is led out to the outside in a hermetically sealed manner, and connected to a power source (not shown).

In addition, the reference numeral 12 in FIGS. 8 and 9 is an exhaust pipe,
A closed container 8 having a discharge space 9 is sealed with at least one rare gas such as xenon, krypton, argon, neon, helium, etc., or in some cases, this rare gas and a predetermined amount of mercury.

In the conventional flat fluorescent lamp 1 configured as described above, when a predetermined voltage is applied between the pair of electrodes 10.10, a glow discharge occurs between the two electrodes 10.10, and this glow discharge is sealed The mercury atoms in the container 8 are excited to generate ultraviolet rays, the ultraviolet rays excite the fluorescent film 4 of the front plate 1, and visible light is emitted from the light emitting surface on the outer surface of the front plate 1.

In addition, the ultraviolet rays generated inside the airtight container 8 are removed from the back plate 2.
The light is diffused and reflected by the light diffusion fI45 and the light reflection [16], and is guided to the fluorescent film 4 side of the front plate 1a, increasing the luminous efficiency of the light flowing into the fluorescent film 4.

Therefore, the entire front boot 1a emits light almost uniformly, so there is little unevenness in brightness.

(Problem to be Solved by the Invention) However, in such a conventional flat fluorescent lamp 1, a frit glass is used to airtightly lead out one end of the pair of electrode leads 11 and 11 in the form of a fully bent strip. There is a problem that cracks may occur in the glass spacer 3, the front plate 1a, and the back plate 2 around the penetration portion A (see FIGS. 11 and 12).

That is, as shown in FIGS. 11 and 12, when the outer ends of the pair of electrode leads 11 and 11 led out from the penetration part A of the frit glass 7 are inserted into the socket of a power adapter (not shown), , these electrode leads 11.
If an external force is applied to each outer end of 11 from the vertical direction, for example, on both the upper and lower sides in the figure, the stress will concentrate on the penetration part, and the glass frit 7 and the front plate la of this penetration part A will be concentrated.
.

There is a possibility that cracks may occur in the back plate 2 and spacer 3.

Therefore, the present invention has been made in consideration of the above circumstances, and
The purpose of this is to prevent cracks around the penetration portion that airtightly penetrates the pair of electrode leads.

(Structure of the Invention) (Means for Solving Problem i) The present invention has been made to solve the above-mentioned problem, and the invention according to claim 1 (hereinafter referred to as the first invention) provides a method for solving problem i. The electric lamp is characterized in that one end of the electrode lead is embedded in a glass member and the other end of the electrode lead is led out.

Further, in the invention as claimed in claim 2 (hereinafter referred to as the second invention), one end portion of the electrode lead is guided out to the outside in an airtight manner from a glass member interposed between a pair of planar substrates. The electric lamp is characterized in that a notch is provided at the outer end of the electrode lead.

(Function) When an external force is applied to the outer end of the electrode lead according to the first and second inventions, the stress of the electrode lead is dispersed by the notch, and stress concentration on the glass member can be prevented.

Therefore, stress can be prevented from concentrating on this glass member and causing cracks.

(Example) Hereinafter, an example in which the first and second inventions of the present application are applied to a flat fluorescent lamp will be described based on FIGS. 1 to 6. In addition, in Figures 1 to 6, Figures 7 to 12
Parts common to those shown in the figures are given the same reference numerals.

FIG. 1 is an exploded perspective view showing the overall structure of an embodiment of the first and second inventions, and the flat fluorescent lamp 20 of this embodiment is characterized by a pair of electrode leads 21, 21'.

That is, the pair of electrode leads 21.21 are made of metal band plates, one end of which is fixed to one end in the axial direction of the pair of electrodes 10.10, and the other ends 21a, 21a are made to pass through the frit glass 7 in an airtight manner. They are led out of the airtight container 8 in a substantially horizontal direction, and are electrically connected to a power source (not shown) or the like.

Each outer end 21a of the pair of electrode leads 21.21
, 21a, for example, are formed with circular arc notches 22, 22, . . . having a required depth on each side edge.

Therefore, as shown in FIG.
．． When a bending moment is applied from the direction of the arrow in the figure from the vertical direction to both the front and back sides of the outer end portions 21a and 21a of the electrode leads 21 and 21, the stress generated in the pair of electrode leads 21 and 21 is applied to the circular arc notch 22. This stress is absorbed and dispersed by the electrode leads 21 and 21 as in the conventional example.
can be prevented from concentrating around the penetration portion A of the frit glass 7.

As a result, it is possible to prevent the stress of the electrode leads 21, 21 from concentrating on the penetration part A and causing cracks in the frit glass 7, spacer 3, front plate 1a, and back plate 2 surrounding this penetration part. can.

Further, as shown in FIGS. 5 and 6, when inserting the outer ends 21a, 21a of the pair of electrode leads 21.21 into the socket 23a of the power adapter 23, for example, the electrode leads 21.21 A compressive load is applied in the axial direction, but
At this time, the stress generated in the pair of electrode leads 21.21 is dispersed by the circular arc notches 22.22, so that stress can be prevented from concentrating around the open part A of the electrode leads 21.21. Can be done.

In addition, as shown in FIG. 6, the socket l-2 of the adapter 23
When the outer ends 21a, 21a of the pair of electrode leads 21.21 inserted into the electrode leads 21.21 are pulled out, tensile stress is generated in the electrode leads 21.21, but this stress is applied to the circular arc notch 22 as described above. Since the stress is dispersed by .degree.22, it is possible to prevent stress from concentrating on the eight edges of the L1 passage.

Therefore, it is possible to prevent stress from concentrating around the page opening and cracks occurring, and from leaking the discharge gas inside the sealed container 8 to the outside through the cracks.

In the above embodiment, a case was explained in which circular arc notches 22, 22... Not done.

Further, in the above embodiment, the case where the present invention is applied to the flat fluorescent lamp 20 has been described, but the present invention is not limited to this, and can be applied to, for example, an incandescent light bulb or other discharge lamps. can.

〔Effect of the invention〕

As explained above, the present invention provides a notch at the outer end of the electrode lead, one end of which is buried within the glass member.
If an external force is applied to this outer end and stress is generated, this stress can be dispersed by the notch.

Therefore, it is possible to prevent the stress of the electrode lead from concentrating around the buried base end (penetrating part) of the glass member and from generating cracks.

3 is a plan view of the embodiment shown in FIG. 1 after assembly, FIG. 4 is a perspective view of the main part of FIG. 3, and FIG. 5 shows the electrode lead shown in FIG. FIG. 6 is a side view showing the state in which the electrode lead shown in FIG. 4 is inserted into the socket of the power adapter, and is pulled out. FIG. 8 is a plan view of the conventional example shown in FIG. 7 after assembly, FIG. 9 is a front view of FIG. 8, FIG. 10 is a sectional view taken along the line x-X of FIG. The figure is a perspective view showing a conventional electrode lead.
FIG. 2 is a side view showing a state where a bending moment is applied to the electrode lead shown in FIG. 11.

1a...Front plate (planar base), 2...Spine plate (planar base), 3...Spacer, 10...
- Electrode, 20...Flat fluorescent lamp, 21...Electrode lead, 22...Circular notch (notch 8Ii).

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view of an embodiment of the first and second inventions of the present application, and FIG. 2 is an assembled view of the embodiment of FIG. 1. Figure Xθ Figure Figure 12

Claims (1)

[Claims] 1. One end of the electrode lead is embedded in a glass member,
An electric lamp in which the other end of the electrode lead extends outward, characterized in that a notch is provided at the outer end of the electrode lead. 2. In an electric lamp in which one end of the electrode lead is hermetically passed through a glass member interposed between a pair of planar bases and led out to the outside, a notch is provided at the outer end of the electrode lead. An electric light featuring