JPH03182042A - Fluorescent lamp - Google Patents

Abstract

PURPOSE:To prevent dispersion of an electrical characteristic and improve sealing strength by coaxially sticking spherical glass beads to individual wells through parts, and sealing the wells in an envelope passage with the spherical glass beads inserted in the recessed part of the envelope through part. CONSTITUTION:Spherical glass beads 20 are coaxially sticked to individual parts where wells 11, 11,... sticked to anodes 10a-10d penetrate the bottom part of the lower end part 2b of an envelope 2 in a vertical direction. A recessed part 22, engaged with the lower end surfaces of the spherical glass beads 20 with slight play, is formed on a through part where the wells 11 are penetrated. Individual glass beads 20 are inserted in the recessed part 22 to be airtightly sealed. Thus the glass beads can be highly accurately sticked to individual wells envelope through parts to prevent the dispersion of an electrical characteristic also to improve sealing strength.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a fluorescent lamp suitable for display fluorescent lamps, which are display elements of electronic display panels, and light emitting elements of decorative lighting, for example. In particular, it relates to a fluorescent lamp with improved electrode wells.

(Prior Art) In general, display fluorescent lamps suitable for display elements of electronic display panels include single-tube monochromatic or single-tube multicolor fluorescent lamps. An example thereof is a fluorescent lamp 1 constructed as shown in FIGS. 6 and 7.

In this fluorescent lamp 1, a button stem 4 having a cathode 3 erected thereon is tightly fitted into an envelope 2 formed in the shape of a cylinder with a bottom and made of stainless steel or the like, after the outer periphery of the button stem 4 is filled with frit glass.

Next, this button stem 4 is welded to the inner bottom of the envelope 2, and the exhaust pipe 4a is airtightly extended to the outside from the bottom center hole 2h of the envelope 2.

The envelope 2 has an upper step portion 2a having a rectangular planar shape, for example, by sequentially widening the upper part of the opening into a rectangular tube shape in two stages.
and a lower step portion 2b, respectively.

In addition, the entire inner peripheral surface of the envelope 2 is coated with a glass film (not shown), and when a discharge occurs within the envelope 2, the metal envelope 2 is coated with a glass coating (not shown). The glass coating prevents impure gases from being released.

Next, a tapered tube 6, which is a part of the fluorescent film adherend that expands in a tapered shape toward the upper end in the figure, is coaxially inserted into the envelope 2, and It is fixed to the inner circumferential surface of the bottom.

A partition plate 8 having, for example, a cross-shaped planar shape is coaxially inserted and fixed into the tapered cylinder 6, and a partition plate 8, for example, a sixth
As shown in the figure, there are four light emitting chambers 8a.

It is divided into 8b, 8c, and 8d.

Each of the inner surfaces of the tapered surface 6C of the tapered tube 6 facing each of the light emitting chambers 8a to 8d and each outer surface of the partition plate 8 have, for example, each light emitting chamber 8a.
A fluorescent film 9 having a different luminescent color is deposited every ~8d.

The upper end of the tapered cylinder 6 in FIG.
a... In addition, the lower end in the figure is integrally connected in the shape of a straight body, and a circular discharge hole 6b is opened at the bottom of the right end of the straight body.

The tapered tube 6 is supported by being engaged with the inner surface of each corner of the lower step 2b in the envelope 2.

The anodes 10a to 10d are formed in a cylindrical shape,
The light emitting chambers 8 a to 8 d in the tapered tube 6 are arranged at the outer corners of the upper ends thereof.

Each of the anodes 10a to 10d has the upper end of each straight pin-shaped well 11.11... fixed coaxially to its lower end, and the tip of each well 11.11... The bottom of the lower step part 2b is penetrated in the vertical direction, and the penetration part is filled with frit glass g to be airtightly sealed, fixed, and extended to the outside. These outer ends are electrically connected to a lighting circuit (not shown).

Next, the outer periphery of the rectangular flat transparent glass transparent plate 12 is filled with frit glass, and then the transparent plate 12 is fitted into the upper step 2a of the envelope 2.
It sticks inside a.

As a result, the envelope 2 is airtightly sealed, so the air inside the envelope 2 is exhausted through the exhaust pipe 4a, and after the exhaust, mercury and rare gas are filled in, and the transparent plate 12 is made to fluoresce. This is the light emitting surface of lamp 1.

(Problem to be Solved by the Invention) However, in the conventional fluorescent lamp 1, the inner bottom surface of the lower step part 2b of the envelope 2 through which the well 11 passes is flat, and frit glass g is added to the inside of this flat bottom part. Since the penetrating portion of the well 11 is then sealed, there is a problem in that it is difficult to position the sealed portion (penetrating portion) of the well 11 with high precision.

For this purpose, each anode 1 in each light emitting chamber 8a to 8d
There are variations in the installation height of 0a to 10d,
A slight variation occurs in the length of the discharge path between the cathode 3 and each of the anodes 10a to 10d, and variation occurs in electrical characteristics such as discharge starting voltage between each of the anodes 10a to 10d.

Furthermore, since the inner bottom surface of the lower step portion 2b is flat, it is not possible to secure a large bonding area between the flat bottom surface and the well 11, which results in insufficient sealing strength of the well 11 and There is a risk that the penetrating portion may cause an electrical short circuit to the metal envelope 2.

Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and it is possible to position the sealing point of the well with respect to the envelope with high precision and easily, prevent variation in electrical characteristics, and seal the well. The object of the present invention is to provide a fluorescent lamp whose intensity can be increased.

[Structure of the invention]

(Means for Solving the Problems) According to the present invention, since spherical glass beads can be fixed at predetermined positions of the wells 11 fixed to the anodes 10a to 10d with high precision positioning, from the outer end (lower end) of the glass beads This was developed with the focus on the ability to set the length (height) to the outer end (upper end) of the anode with high precision, and is constructed as follows.

That is, the present invention has a plurality of wells which are respectively fixed to a common electrode and a plurality of electrodes for discharging within an envelope, and whose free ends are drawn out to the outside through a part of the envelope in an airtight manner. In the fluorescent lamp, spherical glass beads are fixed coaxially to the penetrating portions of the wells that pass through a portion of the envelope, and recesses that fit into the portions of the glass beads are formed in the envelope. The recesses are formed inside the through-holes, and the glass beads are fitted into the recesses and hermetically sealed.

(Function) Spherical glass beads are fixed in advance through highly accurate positioning in the penetration parts where the plurality of wells, each fixed to the plurality of electrodes, pass through a part of the envelope. The length (height) from the outer end (lower end) of each bead to the outer end (upper end) of the plurality of electrodes is set equally with high precision.

Therefore, by passing these wells through the envelope with the glass beads fitted into the recesses of the penetration portion of the envelope, the length from the outer end of each glass bead to the outer ends of the plurality of electrodes can be measured. In other words, the mounting heights of the plurality of electrodes can all be made equal.

For this, the distance between the multiple electrodes and the common electrode, i.e.
Since the discharge path lengths can all be made equal, it is possible to reduce variations in electrical characteristics such as each discharge starting voltage between the plurality of electrodes.

In addition, since the wells are sealed to the envelope by fitting spherical glass beads into the recess of the penetration part of the envelope, the bonding area between the glass beads and the recess is increased and the sealing strength is increased. In addition, the sealing position can be easily determined.

Furthermore, since glass beads are electrical insulators, electrical shorts between the wells and the envelope can be prevented even when the envelope is made of metal.

(Example) Examples of the present invention will be described below based on FIGS. 1 to 5.

3, 4, and 5 are a plan view of an embodiment of the present invention, a sectional view taken along the line IV-IV of this plan view, and an exploded perspective view. Wells 1 fixed to conventional anodes 10a to 10d shown in FIG.
1.11... is characterized in that spherical glass beads 20 are fixed coaxially to each penetration part that vertically passes through the bottom of the lower end 2b of the envelope 2; Since it is almost the same as Fig. 6 and Fig. 7, in Fig. 1 to Fig. 5,
Components common to those shown in FIGS. 6 and 7 are designated by the same reference numerals, and redundant explanation thereof will be omitted.

In other words, as shown in FIG. 5, in this embodiment, for example, four wells 11, 11, Spherical glass beads 2 are attached to the outer periphery of the penetration portion that vertically penetrates the bottom of the lower end 2b of the envelope 2.
0.20... are fixed coaxially.

Next, an example of a method for fixing the glass beads 20 to the wells 11 will be explained based on FIGS. 2(A) to 2(C).

First, as shown in FIG. 2(A), for example, an anode 10
A cylindrical glass bead 20 is inserted into a predetermined position of the well 11 to which a is fixed.

Next, when the glass beads 20 are heated and softened with a burner or the like in this inserted state, the inner cavity of the cylindrical glass beads 20 is crushed and plastically deformed into a solid, almost spherical shape, as shown in FIG. 2(B). and is fixed at a predetermined position in the well 11.

Therefore, while the glass beads 20 are still softened, the lower half of the glass beads 20 is inserted into the sister-shaped recess on the upper surface of the mold 21, and molded into a predetermined sister-shaped recess.

As a result, as shown in FIG. 2(C), 20 glass beads
The height h from the lower bottom surface of the anode 10a to the upper end of the anode 10a and the predetermined contact shape with the envelope 21 are set with high precision.

Therefore, by this method, the work of fixing the glass beads 20 in the predetermined position of the well 11 is performed by the other anode 10b.
By repeating this process for each of the wells 11 through 10d, the height h from the upper end of all the anodes 10a to 10d to the bottom surface (outer end) of each glass bead 20 can be made equal with high accuracy.

On the other hand, as shown in FIG. 4 and FIG. 1(A), the inner bottom surface of the lower end 2b of the envelope 2 has a penetration portion through which the well 11 passes, and the bottom surface of the spherical glass beads 20 Sister-shaped recesses 22 that fit together with a slight play are formed, and a through hole 23 through which the well 11 passes is bored in the center of each recess 22.

Then, the glass beads 20 of each well 11 of all the anodes 10a to 10d are respectively fitted into the sister recess 22 of the lower end 2b of the envelope 2, and the tip of each well is inserted into the through hole 23. Insert.

Thereafter, as shown in FIG. 1A, frit glass g is injected into the gap between the recess 22 and the glass beads 20 to seal the wells of all the anodes 10a to 10d to the lower end 2b.

Therefore, according to this embodiment, each of the anodes 10a to 10
Since the heights from the upper end (outer end) of d to the lower end (outer end) of each glass bead 20 are the same with high precision, the mounting heights of the anodes 10a-10d in each of the light emitting chambers 8a-8d are the same. Become.

As a result, the distance from the common electrode 3 to the upper end of each anode 10a to 10d, that is, the discharge path length, is all the same, so it is possible to prevent variations in starting voltage, etc. between each anode 10a to 10d, and reduce variations in electrical characteristics. .

Furthermore, since each spherical well 11 is fitted into each sister-shaped recess 22, it is possible to easily position the penetrating portion of the well 11 and to increase the bonding area.

Therefore, the sealing strength of the well 11 can be increased accordingly, and the airtightness of the penetration portion of the well 11 can be improved.

In addition, the area around the penetration part of each well 11, 11... is covered with glass beads 20, which are electrical insulators, to prevent an electrical short between the well 11 and the lower end 2b of the metal envelope 2. can.

FIG. 1(B) is an enlarged longitudinal cross-sectional view of a main part of another embodiment of the present invention, in which glass beads 20A are fitted into the recess 22 of the lower stage wJ2b of the metal envelope 2. , is characterized in that it is welded without using frit glass. Since the other parts are the same as those in the previous embodiment, the same reference numerals are given to the parts in FIG. 1(B) that are common to the parts shown in FIG. 1(A).

In other words, 2OA of glass beads is 2O of glass beads.
The glass bead 20A is formed into a deformed spherical shape such that a portion of the bottom portion of the glass bead 20A is slightly exposed outside the through-hole 23 when the glass bead 20A is inserted into the through-hole 23.

Then, with the glass beads 20A fitted into the sister recesses 22 of the lower step portion 2b, the envelope 2 including the lower step portion 2b is heated, for example, by high frequency, and the glass beads 2OA are melted by the heating. It is fused into the recess 22.

The envelope 2 may be heated by heater heating or burner heating, and the heating means is not limited.

In this embodiment, as in the previous embodiment, the height from the upper end of each anode 10a to 10d to the lower end of each glass bead 20A is highly accurate and equal, so that each anode 10a
Variations in electrical characteristics such as starting voltage between 10d and 10d can be reduced.

In addition, the sealing strength of the well 11 is improved and the well 11
Similar to the embodiment described above, it is possible to prevent electrical short-circuits between the housing 2 and the envelope 2 and to improve the airtightness of the penetration portion of the well 11.

In addition, regarding the embodiment shown in FIG. 1(A) of the present invention,
It can also be applied when the envelope 2 is made of ceramics.

〔Effect of the invention〕

As explained above, according to the present invention, glass beads can be fixed with high precision to the envelope penetration part of each well fixed to a plurality of electrodes, so that each distance between a plurality of electrodes and a common electrode can be fixed. In other words, each discharge path length can be set equally.

Therefore, it is possible to prevent variations in electrical characteristics such as variations in starting voltage due to variations in discharge path length between the plurality of electrodes and the common electrode.

Furthermore, since a part of the spherical glass piece is fitted into the recess of the envelope and sealed, the bonding area between the glass beads and the recess is increased, increasing the sealing strength and reliability of the well. be able to.

[Brief explanation of drawings]

Fig. T (A) is an enlarged vertical cross-sectional view of the main part of one embodiment of the fluorescent lamp according to the present invention shown in Fig. 4, and Fig. 1 (B) is an enlarged longitudinal cross-sectional view of the main part of another embodiment of the present invention. Figure, Figure 2 (Δ), (
B) and (C) are process diagrams showing an example of the method of fixing glass beads to the wells shown in FIG. 1(A), and FIG. FIG. 4 is a sectional view taken along the line TV-TV in FIG. 3, FIG. 5 is an exploded perspective view of the embodiment shown in FIGS. 3 and 4, and FIG.
The figure is a plan view of a conventional fluorescent lamp, and Figure 7 is the same as Figure 6.
FIG. DESCRIPTION OF SYMBOLS 1... Fluorescent lamp, 2... Envelope, 3... Cathode (common electrode), 10a-10d... Anode (plurality of electrodes), 11... Well, 12... Translucent Plate, 20.20A...Glass beads, 21...Type,
22... recessed part, 23... through hole, g... frit glass. a b Fig. 3 Fig. 4 (A) (A) Fig. (B) Fig. (Japanese) (C) Fig. 5 6a 2a H6b 6a 1 ノ, 1 ノFig. 6 Fig. 7

Claims (1)

[Claims] In the fluorescent lamp, the fluorescent lamp has a plurality of wells, each of which is fixed to a common electrode and a plurality of electrodes for discharging within an envelope, and whose free ends are drawn out to the outside by passing through a part of the envelope in an airtight manner. Spherical glass beads are fixed coaxially to the penetration parts of the wells that penetrate a part of the envelope, and recesses that fit into part of these glass beads are formed inside the penetration parts of the envelope, respectively. A fluorescent lamp characterized in that the glass beads are formed into recesses and the respective glass beads are fitted into these recesses and hermetically sealed.