JPH03280350A - Fluorescent lamp - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Field of Application) The present invention is directed to a fluorescent lamp suitable for use as a display element of an electronic display panel, for example, and a fluorescent lamp suitable for a light emitting element of Airoba decorative lighting. In particular, the present invention relates to a fluorescent lamp with an improved bottomed fluorescent film adherend.

(Prior Art) In general, display fluorescent lamps suitable for display elements such as electronic display panels include single-tube monochromatic or single-tube multicolor fluorescent lamps.

An example of such a lamp is a fluorescent lamp 1 constructed as shown in FIGS. 6 and 7, in which a cylindrical or similar envelope 2 is filled with a discharge gas such as mercury and a rare gas. , a cathode 3 that is a common electrode, and a plurality of electrodes, for example, four anodes 4a.

4b, 4c, and 4d are arranged facing each other and housed in an airtight manner.

Further, in the discharge space between the cathode 3 and each of the other anodes 4a to 4d, this fluorescent lamp 1 houses a fluorescent film adherend 5 having, for example, a funnel-shaped longitudinal section in the envelope 2,
A part of this discharge space is formed into a plurality of parallel discharge paths corresponding to the number of electrodes of the anodes 4a to 4d.

Further, the fluorescent film adherend 5 has a tapered inner surface 5a facing each parallel discharge path, for example, red (R), G
The four light-emitting chambers 5a, 5b, 5c are each coated with a required fluorescent film so as to emit color light of (green) and B (blue), respectively.
5d, and circular discharge holes 6 for passing discharge are formed on the bottom surface 5b of the fluorescent film adherend 5 in correspondence with the light emitting chambers 5a to 5d.
a, 6b.

6c and 6d are bored with the same diameter.

Therefore, by selectively energizing the cathode 3 and the anodes 48 to 4d, each of the light emitting chambers 58 to 5d can emit colored light as appropriate, and the light can be emitted to the outside from the transparent plate 7 forming the display surface.

(Problems to be Solved by the Invention) By the way, since each of the discharge holes 6a to 6d is a simple hole, naturally a fluorescent film is not coated thereon, and these are portions that do not contribute to light emission, and are seen as black spots.

Therefore, in the conventional fluorescent lamp 1 in which each of the discharge holes 6a to 6d is arranged inwardly at the approximate center of the transparent plate 7 forming the display surface, as shown in FIG. Not only are the sunspots very conspicuous, but the light emitting area is reduced by the area of the sunspot, and the brightness is reduced accordingly.

For this reason, the brightness is different when viewing the transparent plate 7 at an angle where the discharge holes 6a to 6d can be seen and when viewing the transparent plate 7 at an angle where the discharge holes 6a to 5 (l) are hardly visible. , the latter appears brighter than the former.

Therefore, in order to solve this problem, each discharge hole 68
A method of reducing the diameter of the discharge holes 68 to 6d can be considered, but in this case, the impedance of the discharge space around them increases due to the reduction in the diameter of the discharge holes 68 to 6d, so both the discharge starting voltage and the lamp voltage increase significantly. .

Therefore, there is a problem in that the withstand voltage capacity of the lighting circuit device for lighting the fluorescent lamp 1 is increased, leading to an increase in the size and cost of the lighting circuit device itself.

The present invention has been made in consideration of the above circumstances, and its object is to provide a fluorescent lamp that can both improve brightness and improve the uniformity of the brightness.

[Structure of the invention]

(Means for Solving the Problems) In the present invention, each of the discharge holes 68 to 6d is provided in a position that is not visible when the transparent plate 7 is viewed from the front, and is configured as follows.

In other words, the present invention provides a bottomed fluorescent film adhered body in which a fluorescent film is adhered to the inner surface of a tapered surface that expands toward a transparent plate forming a display surface, and the transparent plate and the fluorescent film adhered body. and a partition member for dividing a light emitting chamber formed by It is characterized by having a hole in each light emitting chamber.

(Function) Each discharge hole is formed in the bottom side surface of the fluorescent film adherend, which is inward from the reduced diameter end of the tapered surface. Since each discharge hole is located behind the diameter-reduced end of the tapered surface of the fluorescent film adherend, each discharge hole cannot be seen.

Therefore, the entire fluorescent film adherend appears to emit light.
The brightness can be improved.

Furthermore, when this fluorescent lamp is viewed from a diagonal direction at a required angle with respect to its transparent plate, each discharge hole is blocked by the tapered inner surface of the fluorescent film adherend and the partition member, so in this case, each discharge hole is It is possible to prevent black spots from appearing in the discharge holes.

Therefore, it is possible to prevent the brightness from changing due to differences in viewing angles of the transparent plate, and it is possible to improve the uniformity of the brightness.

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

FIG. 2 is a plan view of an embodiment of the present invention, and FIG. 3 is a diagram showing the outline of FIG. It is formed into a cylindrical shape with a bottom by, for example, punching a thin metal plate, and one end in the axial direction (the upper end in the figure) is open.

The lamp casing 20 has its opening upper end gradually widened in two stages, upper and lower, into a rectangular cylindrical shape, thereby forming an upper step 20a and a lower step 20b, each having a rectangular planar shape, for example. The entire inner peripheral surface from the lower end of the lamp casing 20 to the lower bottom of the lamp casing 20 is coated with a glass coating (not shown), so that when an electric discharge occurs within the lamp casing 20, the metal lamp casing 2
The glass coating prevents the internal impurity gas from being released from the 0.

Further, a center hole 20c is bored in the bottom of the lamp casing 20.

Next, the configuration of this embodiment will be described approximately in the order of assembly, including FIG. 4.

First, a button stem 21 formed into a disk shape made of glass to fit the cylinder is inserted into the cylindrical lower part of the lamp casing 20, and is tightly fitted into the cylindrical bottom.

Thereafter, the outer circumferential surface of the button stem 21 is welded and fixed to the inner circumferential surface of the lower bottom of the lamp casing 20 using frit glass or high-frequency heating, and a cathode 22, which is a common electrode, is erected on the button stem 21. The tips of a pair of lead wires 22a and 22b supporting both ends of the cathode 22 are passed through the button stem 21 in the thickness direction and electrically connected to a lighting circuit (not shown).

In addition, the button stem 21 has a center hole 21a bored in its center, and a glass exhaust pipe 23 is integrally protruded from the lower weight [] periphery of the center hole 21a. When the exhaust pipe 23 is airtightly fitted into the bottom of the lamp casing 20, the tip of the exhaust pipe 23 is inserted into the lamp casing 2.
0 extends outward from the bottom center hole 20c.

Next, the outer casing 24a of the fluorescent film adherend 24 is inserted into the lamp casing 20.

The fluorescent film adherend 24 has a funnel-shaped outer casing 24a having a tapered surface 24a1, and a cross-shaped partition plate 24b coaxially fitted therein to form, for example, four light-emitting chambers 25a, 25b,
It is divided into 25c and 25d.

Outer casing 24a facing these light emitting chambers 25a to 25d
Each tapered inner surface 24a1 and each outer surface of the partition plate 24b are sequentially coated with green (G), for example, for each of the light emitting chambers 25a to 25d.
, a fluorescent film 26 that emits red (R), green (G), and blue (B) light.
are attached to each.

After inserting this fluorescent film adherend 24 into the lamp casing 20, a plurality of electrodes, for example four anodes 27
a, 27b, 27c, and 27d are inserted into the lamp casing 20.

Each of the anodes 27a to 27d has a straight short axis with a slightly larger diameter at its tip, and each of the light emitting chambers 25a to 27d has a substantially rectangular shape.
25d at the top of each corner.

Next, a rectangular flat transparent glass transparent plate 28 is fitted into the upper step 2Oa of the lamp casing 20, and the inner surface of the transparent plate 28 is connected to the outer casing 24a of the fluorescent film adherend 24 and the partition plate 24b. The translucent plate 28 is brought into contact with the upper end and fixed to the upper step part 20a with a frit glass, and this translucent plate 28 is used as a display surface of the fluorescent lamp.

The outer casing 24a has a tapered surface 24a.
The cylindrical bottom portion 24 has a bottomed straight body shape from the reduced diameter end 24a2.
c hangs down integrally, and the circular bottom surface 2 of this cylindrical bottom portion 24c
4d is hermetically closed.

Each light emitting chamber 2 is provided on the inner bottom surface 24d of this cylindrical bottom portion 24c.
A fluorescent film 26 emitting light in the same color as that of 5a to 25d is respectively applied, and the lower bottom surface of the partition plate 24b in the figure is brought into close contact with the partition plate 24b.

Further, on the side surface of the cylindrical bottom portion 24C of the outer casing 24a, as shown in FIG.
For example, a circular discharge hole 29a is provided every d.

29b, 29c, and 29d are formed respectively, and when the transparent plate 28 is viewed from the front, these discharge holes 29
A to 29d are hidden from view.

Each discharge hole 29a to 29d has a cathode 22 and each anode 2.
This discharge is guided into each light emitting chamber 25a to 25d through the discharge generated between 7a to 27d.

Next, the operation of this embodiment will be explained.

When the cathode 22 and a required anode, for example 27d, are energized, discharge occurs between the cathode 22 and the anode 27d. This discharge occurs in the light emitting chamber 2 equipped with the anode 27d.
5d through the discharge hole 26d, and this light emitting chamber 2
The mercury atoms within 5d are excited to generate ultraviolet light.

This ultraviolet light excites the fluorescent film 26 in the light emitting chamber 25d to emit light in a desired color, and this emitted light is emitted from the light-transmitting plate 26 that forms the display surface.
8 and radiates outward.

Further, when a discharge is generated in all the anodes 27a to 27d and the cathode 22, the discharge is generated in all the discharge holes 29a to 29d.
The ultraviolet light enters into the total light emitting chambers 258 to 25d, where the ultraviolet rays are generated.

These ultraviolet rays are emitted by all fluorescent films 26 of all light emitting chambers 25a to 25d.
are excited to emit light in each color, so that the transparent plate 28 emits a combination of all these emitted colors, such as white light, to the outside.

As described above, since the discharge holes 29a to 29d are formed in the side surface of the cylindrical bottom 24c of the outer casing 24a, when the fluorescent lamp of this embodiment is viewed from the front of the transparent plate 28, , each of the discharge holes 29a to 29d is located at the reduced diameter end 24a2 of the tapered surface 24a of the outer casing 24a.
Because it is located behind the camera, it is hidden and cannot be seen.

In other words, each of the discharge holes 29a to 29d is not seen as a black spot, and almost the entire inner surface of each of the light emitting chambers 25a to 25d appears to emit light, so that brightness can be improved.

Further, as shown in FIG. 1, when the transparent plate 28 is viewed from an angle, the partition plate 2
4b blocks the line of sight, so that the discharge holes 29a to 29d cannot be seen in this case as well.

That is, even if the inside of the transparent plate 28 is viewed from almost any angle, the discharge holes 29a to 29d are blocked and hidden by the tapered surface 24a1 and the partition plate 24b.

Therefore, it is possible to prevent differences in brightness due to differences in viewing angles with respect to the transparent plate 28, and to improve the uniformity of brightness.

Note that the present invention provides a cylindrical lower portion 24c of the outer casing 24a.
The shape of the outer casing 30 is not limited to a straight body shape with a bottom, but may have a reverse taper shape with a bottom, for example, as shown in FIG. The discharge holes 29a to 29d may be formed in a cylinder and the discharge holes 29a to 29d are formed in the side surface of the inversely tapered cylinder 30a.Also, with this, substantially the same effects as in the embodiment described above can be achieved.

Further, as shown in FIG. 5(B), the outer casing 40 is formed into an inverted conical shape, and the inner space is divided into a cross-shaped partition plate 41.
The light emitting chambers 25 are partitioned into four light emitting chambers 25a to 25d, and discharge holes 298 to 29d are formed in the side surfaces of the conical bottom of each light emitting chamber 25.
It is also possible to form holes at intervals of a to 25d, and by doing so, it is possible to achieve substantially the same effect as in the embodiment described above.

〔Effect of the invention〕

As explained above, in the present invention, a discharge hole is formed for each light-emitting chamber in the bottom side surface which is inward from the diameter-reduced end of the tapered surface of the bottomed fluorescent film adherend. This can prevent discharge holes that do not contribute to performance from being seen through the transparent plate.

Therefore, according to the present invention, since the discharge holes that do not contribute to light emission are not visible, the light emitting area of each light emitting chamber is expanded accordingly.
Brightness can be increased.

Furthermore, even when the fluorescent lamp of the present invention is viewed from an angle with respect to the light-transmitting plate, each discharge hole is hidden by the tapered surface of the fluorescent film adherend and the partition member. Pores can be hidden.

For this reason, it is possible to prevent differences in brightness due to differences in viewing angles with respect to the light-transmitting plate, and to improve the uniformity of brightness.

[Brief explanation of the drawing]

FIG. 1 is a vertical cross-sectional view of a main part of the fluorescent lamp according to the present invention shown in FIGS. 2 and 3, FIG. 2 is a plan view of an embodiment of the fluorescent lamp according to the present invention, and FIG. Fig. 4 is an exploded perspective view of the embodiment shown in Figs. 2 and 3; Fig. 5 (A) is a longitudinal sectional view of a modification of the embodiment shown in Fig. 1; , FIG. 5(B) is a perspective view of a modification of the embodiment of the present invention shown in FIG. 1, FIG. 6 is a plan view of a conventional fluorescent lamp, and FIG. 7 is a cross section taken along the line ■-■ in FIG. 6. It is a diagram. 22... Cathode, 24... Fluorescent film adherend, 24a
...Outer casing, 24b...Partition plate, 24c...
・Cylindrical bottom, 25a to 25d... Light emitting chamber, 26...
- Fluorescent film, 27a to 27d... Anode, 28...
Transparent plate, 29a to 29d...discharge hole.

Claims (1)

[Claims] It is formed by a bottomed fluorescent film adherend, which is a fluorescent film adhered to the inner surface of a tapered surface that expands toward the transparent plate forming the display surface, and the transparent plate and the fluorescent film adherend. In a fluorescent lamp having a partition member that divides a light emitting chamber into a plurality of light emitting chambers, a discharge hole is bored for each light emitting chamber in a bottom side surface of the fluorescent film adherend inward from a diameter-reduced end of the tapered surface. A fluorescent lamp characterized by: