JPS599848A - Flat discharge lamp - Google Patents

Abstract

PURPOSE:To secure such a lamp that is flat in type, excellent in responsive speed and less in generation of heat due to the glow of the lamp as well as capable of glowing uniformly, by forming the peripheral part of a base plate into a vacuum vessel by means of vacuum sealing, while sealing rare gas, a source of discharge glowing, inside the said vessel. CONSTITUTION:In front of a rear base plate 2, a slender front base plate 4 consisting of a translucent electric insulator such as glass, etc., is disposed in partitioning a minute space away just like covering discharge electrodes 3, 3', outgoing lines 6, 6' and electron radioactive substances 7, 7', for example, interposing a spacer 8 and the like, thereby forming the peripheral part of the rear base plate 2 and the front base plate 4 into a vacuum vessel 5 by means of vacuum sealing, and gas, a source of discharge glowing, composed of rare gases including neon, etc., is sealed inside the vacuum vessel 5.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a flat discharge lamp in which discharge electrodes are disposed facing each other on the surface of an insulating substrate in a planar manner with a small interval between them. The present invention relates to a flat discharge lamp suitable for a removal light source or a back light source for a liquid crystal display.

The flat discharge lamp of the present invention can be used in electronic copying machines and facsimile machines.
) can be used in a variety of fields, such as as a light source for removing static charges from photoreceptors, or as a back light source for liquid crystal displays.
As an example of its use, a case will be described in which it is applied to a light source for removing static charge from a photoreceptor of an electronic copying machine.

Generally, in an electronic copying machine, as shown in FIG. 1, a corona charger A uniformly distributes and charges the surface of a drum-shaped photoconductive photoreceptor B, and then the A light image corresponding to the original to be copied is formed on the photoreceptor B in an exposure section C, and charges in the exposed portion are selectively dissipated to form a latent image corresponding to the light image. Next, in the developing section DK, toner is attached to the latent image by electrostatic force and visualized to form a toner image E. Furthermore, in order to facilitate the transfer, the toner image E is formed by a first static charge removing device F. After the static electricity is removed, the toner image E is electrostatically transferred to the copy paper H in the transfer section GK.
The image is transferred to the image forming apparatus and fixed by applying heat, pressure, etc. in the fixing section. On the other hand, the residual toner on the photoreceptor B is neutralized by a second static charge removing device J to weaken its adhesion, and is removed by a cleaning section K consisting of a brush or the like. Finally, the surface charge remaining on the photoconductive photoreceptor B is removed by a third static charge removing device to bring the surface potential of the photoreceptor B close to zero potential, and the series of copying processes is completed.

The flat discharge lamp of the present invention can be adapted as a light source for the first, second, and third static charge removing devices F, J, and L described above. Conventionally, the light sources mentioned above were fluorescent lamps,
- Filament lamps or neon pilot lamps were used, but fluorescent lamps required ballasts and starting devices, making them larger and more expensive.
Additionally, it is difficult to start up instantly, and the amount of light changes with changes in ambient temperature. On the other hand, although tungsten filament lamps are inexpensive, the heat generated by emitting light increases the temperature of the photoreceptor, which can change the characteristics of the photoreceptor, and also cause the filament to break during use, causing it to not light up. There were also problems in terms of reliability. Furthermore, although neon pilot lamps are inexpensive and do not cause problems such as not lighting up during use, the lamps themselves are small, so it is necessary to arrange a large number of lamps, which takes time and effort to assemble. However, since the light emission from each lamp is spotty, it is difficult to obtain uniform light emission.The present invention was devised to solve the above-mentioned problems, and The present invention provides a flat discharge lamp that is easy to manufacture and inexpensive, and has excellent performance such as fast response speed, low heat generation due to light emission, uniform light emission, and high reliability. . ``An embodiment of the present invention will be described below with reference to the drawings.

2 and 6 are a plan view and a perspective view, respectively, of essential parts of a flat discharge lamp according to an embodiment of the present invention. In the figures, 1 is the entire high-frequency discharge lamp, 2 is a rear substrate, and 3 is a One discharge electrode, 3' is the other discharge electrode, 4 is the front substrate,
5 indicates a vacuum container.

Therefore, the high frequency discharge lamp 1 of this embodiment has an elongated rear substrate 2 made of an electrical insulator such as glass or ceramic.
0 surface, a plurality of ribbon-shaped or linear discharge electrodes 3 are arranged in a column, and a plurality of ribbon-shaped or FiS-shaped discharge electrodes 3 are arranged in correspondence with each of the discharge electrodes 3 on the other side. The discharge electrodes 6' are arranged in columns and arranged in a plane at minute intervals. The discharge electrodes 3 and 6' are provided with lead wires 6 and 6', respectively. In this case, the discharge electrodes 6.5' and the lead wires 6.6' are formed using printing technology, vapor deposition technology, or noble gas as a main component. Iron, nickel,
It can be easily formed by depositing chromium or an alloy thereof in a predetermined pattern. The terminals are baked with silver paste or gold paste to increase mechanical strength and reduce contact resistance.

Further, the surface of the discharge electrode 3.3' is bad.

Ba8r02, Ba8rCaOs, C82Q Y2O5
, BaAl 204, Bad LaB6 or/and Gd
Electron-emitting materials such as B67.7' are deposited using techniques such as dissolving organic metals in organic solvents and applying them, or plasma spraying techniques, resulting in higher costs than when the discharge electrodes are placed in the discharge space. The trend is to lower the operating voltage. Further, on the front surface of the rear substrate 2, discharge electric sand 6.3', lead wire 6.6', and electron radioactive material 7.
An elongated front substrate 4 made of a translucent electrical insulating material such as glass is placed so as to cover the rear substrate 2 and the front substrate 4, with a small space separated by, for example, a spacer 8. Vacuum container 5 with vacuum sealed around the periphery
5F1~, a gas for discharge light emission consisting of a rare gas such as neon is sealed inside the vacuum container 5.

FIG. 4 and FIG. 5 are a plan view and a perspective view, respectively, of essential parts of a flat discharge lamp according to another embodiment of the present invention. In the high-frequency discharge lamp 1 of this embodiment, a plurality of ribbon-shaped or diagonal discharge electrodes 6 are arranged in tandem on an elongated rear substrate 2 made of an electrical insulator such as glass or ceramic. The other discharge electrode 6', which is in the form of a strip of ribbon or a line, is arranged in a plane at a minute interval, facing the one discharge electrode 6. 6
A lead line 6.6' is drawn out from '. In this embodiment as well, the deposition of the electron emitting material 7.7' on the surface of the discharge electrode 3.3', the structure such as the material and arrangement of the front substrate 4, and the filling gas etc. are as shown in FIG. It is essentially exactly the same as the embodiment shown in FIG.

Another embodiment of the present invention shown in FIG. 6 includes a plurality of discharge electrodes 3, either ribbon-shaped or linear, arranged in a column on a rear substrate 2, and opposed to the discharge electrodes 3 in a plane with a small interval therebetween. The other discharge electrode 3' is arranged in the form of a ribbon or a barbed wire in a plurality of sets, and a wide light emitting area can be obtained. Also, in this example
The materials, structures, etc. of the lead wire 6.6', the electron emitting material 7.7', the sealed gas, the front substrate 4, etc. are essentially the same as those of the embodiment shown in FIGS. 2 and 3.

FIG. 7 is a perspective view showing the structure of a rear substrate 2 according to still another embodiment of the present invention. In this embodiment, the discharge electrode port 3' of the rear substrate 2+ is constructed with an L-shaped wire-like electrode. One discharge electrode 3 is a plurality of wire-like electrodes arranged in a column, and the other discharge electrode The configuration is such that a single wire-like electrode is provided as the electrode 3'. In this case, the tips of the folded wire-like electrodes serve as lead wires, which are led out to the back surface of the back substrate 2 through through holes 9 and 9' formed in the back substrate 2. In this embodiment as well, the electron emitting material 7, 7', the filler gas, the front substrate 4, etc. are essentially the same as in the embodiments shown in FIGS. 2 and 6.

On the other hand, the drive circuit for the flat discharge lamp of the present invention is shown in FIGS. 8 and 9, and the drive circuit in FIG.
1. For Driving the Embodiments Shown in the Figures 1 The drive circuit of FIG. 9 is applied to the driving of the embodiments shown in FIGS. 4, 5, 6, and 7. The lead wires 6, 6' of the flat discharge lamp 1 are connected to an AC power source 11 via a current limiting resistor 10, and the lamp is driven in an AC discharge state to obtain a glow discharge. Therefore, the above drive circuit does not require a ballast or a starting device, so it has a simple configuration, and the negative glow radiation formed on the front surface of the electrode in the glow discharge state is brighter than the radiation from a sunlight whip. It is superior in terms of quality.

Although an AC power source is illustrated as the power source 11 in this figure, it is also possible to use a high frequency power source or a DC power source via a converter or the like.

FIG. 10 shows an example of an assembly for incorporating the flat discharge lamp of the present invention into an electronic copying machine, in which a connector 12 is attached to the main body of the flat discharge lamp 1.

As described above, the flat discharge lamp of the present invention has a plurality of discharge electrodes arranged in a column on the back substrate, and the other discharge electrode facing the discharge electrodes with a small interval in the plane. At the same time, the front substrate is placed in front of the rear substrate with a small space between them, and the peripheral area is sealed and a rare gas used for discharge light emission is filled, resulting in a flat and simple structure. A simple drive circuit with fast response speed.
Achieves high brightness, uniform light emission and no heat generation1
It also has excellent features such as high reliability.
Furthermore, it is highly practical as it can be easily mass-produced and is inexpensive.

It is widely used as a back light source for liquid crystal displays.
Since the flat discharge lamp of the present invention is very thin,
Coupled with the thin feature of liquid crystal, it is possible to realize an overall thin display device, and even when a large display area is required, the embodiment shown in FIG. 6 can be used. As shown in the figure, a large-area display can be easily realized using a flat discharge lamp provided with a plurality of discharge electrodes.

[Brief explanation of drawings]

FIG. 1 is a schematic structural diagram of an electronic copying machine, FIGS. 2 and 3 are a plan view and a perspective view of essential parts of a flat discharge lamp according to an embodiment of the present invention, and FIGS. 4 and 5. 6 is a plan view and a perspective view of a main part of a flat discharge lamp according to another embodiment of the present invention, FIG. 6 is a plan view of a main part of a flat discharge lamp according to another embodiment of the present invention, and FIG. A perspective view of essential parts of a flat discharge lamp according to another embodiment of the invention, FIGS. 8 and 9 are a drive circuit for a flat discharge lamp according to an embodiment of the invention, and FIG. 10 is an embodiment of the invention. FIG. 2 is a perspective view showing an example of an assembled flat discharge lamp according to the invention. 1...Flat discharge lamp 2...Back board 3.3'
...Discharge electrode 4...Front substrate 5...Vacuum container patent applicant Patent attorney representing Okaya Electric Industry Co., Ltd. 1) Satoshi Bebe Figure 1 Figure 2 Figure 5

Claims (4)

[Claims] (1) A plurality of ribbon-shaped or linear discharge electrodes are arranged in a column on a back substrate made of an electrical insulator,
Opposed to the one discharge electrode, the other discharge electrode in the form of a ribbon or a line is disposed in a plane with a minute interval therebetween, and is spaced from the rear substrate with a minute space so as to cover the discharge electrode. , a light-transmitting front substrate made of an electrical insulator is arranged, the periphery of the side substrate is vacuum-sealed to form a vacuum container, and a rare gas used for discharge light emission is sealed inside the container. flat discharge lamp. (2) The flat discharge lamp according to claim 1, wherein the other discharge electrode is a plurality of discharge electrodes arranged in a column in correspondence with each of the first discharge electrodes. (3) The flat discharge lamp according to claim 1, wherein the other discharge electrode is a single discharge electrode that corresponds entirely to one discharge electrode. (4) A flat discharge lamp according to any one of claims 1 to 5, characterized in that an electron emitting material is deposited on the surfaces of one and the other discharge electrode.