JPS59127357A - Flat type discharge lamp - Google Patents

Abstract

PURPOSE:To obtain a flat type discharge lamp mechanically strong and highly efficiency because of the long positive column produced therein, by providing a continued positive column space between the glass matrixes forming a vacuum system and arranging the lamp to have a wall structure adhering to the glass matrixes. CONSTITUTION:The sealing of the lamp is carried out by applying low melting glass to the circumsferential portion of the formed glass 2 and the jointing portion of the supporting wall, combining the formed glass 2 and the base glass plate 1 with electrodes inserted therebetween, fixedly holding them in a compression jig, and finally heating them. The thus structured discharge lamp body is evacuated through the exhaust tube 5 and the discharge supporting gas and mercury are filled into the lamp and then the exhaust tube is sealed up. By attaching the base 8 to the pins for guarding the same, the manufacturing process is ended. The thus manufactured flat type discharge lamp is reinforced by the supporting wall against the atmospheric pressure and enabled to be designed with thin glass.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat discharge tube used as a highly efficient flat light source.

Conventionally, the flat discharge tube used as a flat light source is the first
As shown in the figure, the positive column generation area is made into a flat shape,
This is where things shine.

However, in a flat discharge tube with this structure, the brightness at the center is theoretically high, and a region with uniform brightness cannot be obtained over the entire surface. Therefore, flat light sources are limited to elongated shapes. Furthermore, the length of the positive column is limited by the distance between the electrodes, and the ratio of voltage loss in the electric pole is large. In addition, in manufacturing,
In order to increase the strength against atmospheric pressure, it was necessary to add some curvature to the structure and increase the thickness of the glass, making it difficult to manufacture large-sized lamps.

The present invention was devised in view of the shortcomings of the conventional flat discharge tube, and it is possible to create a highly efficient flat discharge tube by installing a support wall in the discharge tube to increase mechanical strength and a longer positive column. It is intended to provide.

Hereinafter, the present invention will be explained in detail based on Examples.

Figure 2 is a structural diagram of a flat discharge tube according to the present invention, Figure 3 fA
I is a cross-sectional view, which is a vertical cross-sectional view taken along a dashed line 9.

The basic structure consists of a vacuum system in which a molded glass 2 is sealed to a glass substrate 1 with a low melting point glass 4.

The explanation will proceed according to the manufacturing process. Support walls 3 are formed on the molded glass 2 at the same time as the glass is formed, and the sealing surface is polished to increase the flatness of the sealing surface. Next, a fluorescent substance is applied to the inner surface and fired.

The coating and baking of the fluorescent substance are performed on the glass substrate 1 in the same way. Tungsten filament 6 which is an electrode
is nucleated with electron radioactive material like a normal discharge tube,
It is supported by the stem and connected to the pace pin 7.

The stem also serves as a low melting point glass 4 used for sealing the glass substrate 1 and the molded glass 2, and the filament is also fixed at the same time during the sealing. Although this example shows the shape of the electrode without an auxiliary electrode, it may also have an auxiliary electrode or a mercury dispenser.

Sealing is performed by applying low-melting glass to the periphery of the molded glass 2 and the adhesion part of the supporting wall, sandwiching the electrode, combining it with the glass substrate (p), fixing it to a compression jig, and heating it. The discharge tube whose outer shape has been formed is then exhausted from the exhaust hole 5, and discharge auxiliary gas and mercury are sealed inside the tube, and the exhaust hole 5 is sealed.In order to reinforce the pace pin, in this embodiment, the base 8 is is attached, and the manufacturing process ends.

FIG. 4 is a sectional view when the support wall 3 is installed in a spiral shape. It is manufactured in the same manner as the cases shown in FIGS. 2 and 3. The spiral shape allows the removal of the pace pin 7 to be concentrated in one location, which facilitates compact design of the device.

In the examples shown in FIGS. 2 and 4, one side of the glass member constituting the vacuum system is a flat glass substrate, but a plane-symmetric molded glass may also be used.

In addition, in the examples shown in Figures 2 and 4, a glass material formed at the same time as the glass base material was used as the support wall, but the support wall material is not limited to glass material, metal plates etc. can also be used, and at the same time A non-molded glass material may also be used.

The flat discharge tube manufactured in this manner has increased machinability against atmospheric pressure due to the supporting walls, and can be designed with a thin glass thickness. Furthermore, it has become possible to manufacture a nearly square flat discharge tube, which was previously impossible.

In addition, the support wall acts as a partition wall for the sunlight pillar, making it possible to obtain a sunlight pillar that is several times longer in external length. Therefore, it has the advantage that voltage loss due to cathode drop and anode drop, which are causes of efficiency reduction, can be relatively reduced.

As a modification of the above-described embodiment, a large flat discharge tube, which was previously impossible, can be realized by manufacturing a plurality of positive columns, their associated vacuum systems, and filaments in the same glass tube. Further, as a plane light source, the divergence of the luminous flux on either one of the surfaces is sufficient. For this reason, molded glass 2. Alternatively, it is also possible to bias the light distribution to one side by coating the inner surface of the glass substrate 11) with a reflective substance (such as fine titanium oxide particles) and coating a fluorescent substance thereon. A similar reflective film may be attached to the outside of the discharge tube. In this way, a planar light source with even higher efficiency can be obtained.

As described above, according to the present invention, the light emitting shape of a flat discharge tube, which was previously only a horizontally elongated shape, can be selected more freely, and restrictions on size are also relaxed. Furthermore, voltage loss at the electrodes can be effectively reduced.

The present invention provides a back light source for various display devices and a highly efficient flat light source with a large degree of freedom in the field of lighting equipment.

[Brief explanation of drawings]

FIG. 1 IAI IBI is a cutaway perspective view of a conventional flat discharge tube. FIG. 2 is a cutaway perspective view of the flat discharge tube of the present invention. FIG. 3 is a sectional view of FIG. 2. iAl is the top view IBI is the longitudinal cross-section taken along the dashed line 9 in AI. Figure 4 is a cross-sectional view of the Subaiworu flat discharge tube according to the present invention as seen from above. Common to all figures, the following conventions apply. (A
) 1... Glass substrate 2... Molded glass 3... Support wall 4... Low melting point glass 5... Exhaust hole 6... Tungsten filament (B
)711...Base pin 8...Base 9...Above the cutting line of the sectional view Applicant Suwa Seikosha Co., Ltd. 6' Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) A flat discharge tube characterized by having a continuous positive column space between opposing glass base materials that constitute the entire vacuum system, and having a wall-like structure bonded between the glass base materials. (21) A flat discharge according to claim 1, wherein a part of the Gawas base material is made of flat glass. Claims 1 and 2 are characterized in that:
The flat discharge tube described in Section 1. 14) A flat discharge tube according to claims 1 and 2, wherein the wall member is a metal plate. (51) The flat discharge tube according to claim 1 or 2, characterized in that the wall member is a glass material independent of the glass base material. (61 Having a plurality of positive column spaces A flat discharge tube according to any one of claims 1 to 5, characterized in that: