JPH0443964Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Field of Application of the Invention) This invention relates to a mounting structure for a small single-ended fluorescent lamp suitable for use as a pixel in a display panel device, for example.

(Prior art) This applicant filed an earlier patent application (Japanese Patent Application No. 1983-
141409), it is a hot cathode type and low pressure gas fluorescent lamp, and is a small, single-ended type with a cathode and an anode placed opposite each other at a small distance only at one end of the bulb, which is coated with fluorescent paint inside. I suggested fluorescent lamps.

This fluorescent lamp is called a single-ended type because the discharge electrodes are provided only at one end of the bulb, facing each other at a short interval, and because the discharge interval is small, it can be lit with a low voltage.

In addition, it can be made into a compact fluorescent lamp with a small diameter and length of the bulb, and because it consumes little power and has a long life, it can be used as a light source element (pixel) to create a large, full-color fluorescent lamp with low power consumption. Display panel devices became possible.

In this case, it was especially necessary to stabilize the discharge of each fluorescent lamp so that light was always emitted from the center of the lamp in order to prevent display unevenness. Since the mount was constructed by placing the positive and negative electrodes side by side and facing each other, the electrodes were not accurately parallel to each other during assembly, resulting in unstable discharge intervals and positions, which caused display unevenness. It was causing this.

On the other hand, as a way to avoid this, it has been considered to tighten quality control so as to obtain uniform discharge intervals and discharge positions, but this has resulted in the problem of poor yield.

Therefore, the inventor developed a hot cathode, single-ended compact fluorescent lamp that uses low-pressure gas, with a rod-shaped positive electrode attached to a coiled filament-shaped negative electrode stretched between a pair of electrode supports erected on the mount. We proposed an arrangement in which the cross-sections are arranged orthogonally in a substantially cross shape with small intervals between them.

With this configuration, the distance between the negative electrode and the positive electrode is the shortest at a position where they are perpendicular to each other.
In addition, even if there is some error in the horizontal state of the positive electrode, the error in the discharge interval is smaller than that in the conventional case where the negative electrode and positive electrode are placed side by side, so this position is inevitably determined as the discharge position, and the conventional It has been found that a fluorescent lamp with a more stable discharge position and a constant brightness can be provided than the conventional fluorescent lamp, and that with this structure, automatic manufacturing can be carried out without much difficulty.

Incidentally, this type of fluorescent lamp has a discharge characteristic that depends on the environmental temperature, and when the environmental temperature is low, the discharge and thus the light emission become unstable. After much thought and error, we attached the geta, which had been attached to the electrode post on the anode side, to the tip of the anode. As a result, the geta was warmed by the discharge, which increased the heat retention effect inside the bulb. It was found that not only stable discharge and light emission unaffected by environmental temperature can be obtained, but also the getter's ability to adsorb impurity gases can be increased, significantly extending the lifespan.

(Technical Issue) This idea was made based on this knowledge, and its purpose is to reduce the effects of environmental temperature on small single-ended fluorescent lamps that use hot cathode and low-pressure gas. The aim is to provide a mount structure that allows the device to emit light without discharging it and thereby significantly extending its life.

(Technical Means) In order to achieve the above-mentioned object, this invention is a hot cathode type single-ended fluorescent lamp using low pressure gas and having a discharge electrode only at one end of the bulb. Three long and short electrode supports are set up so as to form the apex of the electrode, and a coiled filament-shaped negative electrode coated with an electron radioactive material is stretched between a pair of electrode supports of the same length. Attach a rod-shaped positive electrode to the upper end of the remaining electrode support in a direction perpendicular to the upper end of the remaining electrode support, and connect this positive electrode to the negative electrode with a small gap between them at approximately the center and approximately ten A discharge stabilizing member is attached to the free end of the positive electrode in a direction away from the negative electrode, thereby constructing a mount for a small fluorescent lamp.

(Function) By configuring as described above, in addition to the above-mentioned effects of arranging the negative electrode and the positive electrode orthogonally with a short interval, the getter warms up with discharge, and the inside of the bulb is heated. As the temperature of the material increases appropriately and exhibits a heat retention effect, stable discharge can be performed without being affected by the environmental temperature, and if the discharge stabilizing member is used as a getter at the same time, the getter will heat up as the discharge occurs. By doing so, the absorption efficiency for impure gases is further increased.

(Example) According to the drawings, in Figures 1 and 2, 3
Socket 1 with protruding book terminals 1a, 1a, 1b
A valve 4, which has a stem 2 and an exhaust pipe 3 and has a small amount of mercury and a rare gas such as argon sealed inside, is installed on the top. Three electrode pillars 5a, 5a, 5b
are erected, each forming the apex of a triangle when viewed from the plane. Lead wires 5c, 5c, 5d are connected to the electrode supports 5a, 5a, 5b, and although not shown, are passed through the inside of the stem 2 in an airtight manner and led out to the outside of the bulb 4, and terminals 1a, 1a, 1b is connected to. Among the electrode columns, 5a and 5a have the same length, and a coiled filament-shaped negative electrode 6 coated with an electron radioactive substance is stretched between them. A rod-shaped positive electrode 7 is attached to the tip of the other short electrode support 5b in a direction perpendicular to one end thereof, and this positive electrode 7 extends in a direction perpendicular to the negative electrode 6 in a cross shape. 6
They face each other at a small distance so that discharge occurs at low voltage. A mount 9 is formed by attaching a ring-shaped discharge stabilizing member 8, which also serves as a getter, to the free end side of the positive electrode 7 in a direction away from the negative electrode 6, that is, in a downward direction. .

The discharge interval at the intersection between each electrode depends on the diameter of the discharge part of the bulb.
mm to 2.5 mm, and those with a diameter of 10 are 2.5 mm to 3
mm.

When carried out in this manner, the getter simultaneously serves as a discharge stabilizing member, which has the advantage of being rational.

FIG. 3 shows another embodiment, and according to the drawing, by bending the tip of the positive electrode 10 in a direction away from the negative electrode 6, that is, in a downward direction, and letting it hang down,
A discharge stabilizing member 11 is provided and forms a mount 12. Of course, the discharge stabilizing member may also be made of getter material and welded together. Note that other symbols that are the same refer to the same members as those in the above-described embodiment, and therefore explanations thereof will be omitted.

Even if carried out in this manner, the purpose of this invention can be achieved.

Figure 4 shows a lighting circuit, in which terminals 1a and 1b are connected to the positive side of the DC power supply 13, and the other terminal 1a is connected to the negative side, and the switch 14 is turned on.
When turned on, the negative electrode 6 becomes red hot, and thermionic electrons are emitted from one end of the positive electrode 7, 10.
These thermoelectrons collide with evaporated mercury vapor to generate ultraviolet rays, which collide with the fluorescent material coated inside the bulb 4 to generate visible rays, which are emitted to the outside. Once the negative electrode 6 is heated, its effect remains even if the voltage is subsequently lowered.

Note that the visible light can be of many different colors depending on the type of fluorescent material coated inside the bulb, and the shapes and structures of the socket 1 and bulb 4 are not limited to those in the example. .

(Effects) As explained in detail above, this device has an extremely simple configuration and can stabilize the discharge interval and discharge position to keep the brightness constant.In addition, it has a heat retention effect at the discharge position, so it can reduce the environmental temperature. It is possible to perform stable discharge without being affected by

Also, if the discharge stabilizing member is used as a getter at the same time,
By heating, the absorption rate of impure gas can be increased, and the product life can be significantly extended.

Therefore, if these fluorescent lamps are used as pixels in large display panel devices, such as large-scale video displays in plazas and baseball stadiums, and information displays on expressways, clear full-color displays with stable brightness and no display unevenness can be achieved. It is something that can be done.

[Brief explanation of the drawing]

The drawings show one embodiment of this invention, Fig. 1 is a partially sectional front view for explaining this invention, Fig. 2 is a perspective view of the mount part, and Fig. 3 shows another embodiment. FIG. 4 is a perspective view of the mount portion, and FIG. 4 is a circuit diagram for lighting the fluorescent lamp according to the invention. 1... Socket, 2... Stem, 4... Valve, 5a, 5b... Electrode support, 6... Cathode,
7, 10... Positive electrode, 8, 11... Discharge stabilizing member, 9, 12... Mount.

Claims (1)

[Scope of utility model registration request] In a hot cathode type single-ended fluorescent lamp that uses low-pressure gas and has a discharge electrode only at one end of the bulb, three long and short electrode supports are erected from one end of the bulb so as to form the vertices of a triangle. ,
A coiled filament-shaped negative electrode coated with an electron radioactive material is stretched between a pair of electrode supports of the same length, and a rod-shaped positive electrode is placed perpendicularly to the upper end of the remaining electrode support. This positive electrode is placed so as to be perpendicular to the center of the negative electrode with a small distance between it and the negative electrode so that a discharge occurs at a low voltage, and a cross shape is placed on the free end side of the positive electrode. A mount structure for a small fluorescent lamp, characterized in that a discharge stabilizing member is attached in a direction away from the cathode.