JPS63216265A - Single-tube multi-color fluorescent lamp - Google Patents

Abstract

PURPOSE:To suppress the diffusion of an electric discharge to discharge paths other than that being excited by providing a preventing body restricting the diffusion of the electric discharge around a cathode. CONSTITUTION:The radial diffusion of the electric discharge by an anode 51a and a cathode 41 is restricted by the inner periphery of a discharge diffusion preventing body 43. The electric discharge around the cathode 41 is squeezed by the center hole 44 of the preventing body 46 and flows only into the parallel discharge path 49a of a discharge path restricting body 46 with the anode 51a being excited, and the diffusion to other discharge paths 49b-d is suppressed. Therefore, only the phosphor film 50 on the discharge path 49a is excited to give an emission, and the stray light can be suppressed. The red light by the cathode 41 red-heated when observed from the above of a bulb 20 and the blue light by the electric discharge around the cathode 41 are shielded by the preventing body 43, thus the stray light can be suppressed. Accordingly, the diffusion is prevented and the stray light can be suppressed. No part of the bulb 40 is shielded, and the stray light can be suppressed with the good lamp efficiency.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention relates to a single-tube multicolor fluorescent lamp that can emit light of a plurality of colors using a single bulb. Concerning single-tube multicolor fluorescent lamps.

(Prior Art) A conventional example of this type of single-tube multicolor fluorescent lamp is one disclosed in Japanese Patent Application Laid-open No. 55851/1983.

As shown in FIG. 8, one cathode 2 and, for example, three anodes 3a and 3b are placed inside a glass bulb 1 constructed in a closed rectangular cylindrical container.

3C are arranged facing each other along the longitudinal direction of the bulb 1, and each anode 3a is separated from the inside of the bulb 1 by a partition plate 4.4.

= Three discharge paths 5a, 5b corresponding to 3b, 3c.

Cathode 2 of each discharge path 5a, 5b, 5c
A communication path 6 is formed at the side end portion to connect the discharge paths 5a, 5b, and 5c in the width direction.

At least one surface of the inner surface of the bulb 1 facing each fil electric circuit 5a, 5b, 5c is coated with a phosphor film that emits light of a different color for each discharge path 5a, 5b, 5c.゛The anode 3a that performs the market.

Color light is emitted as appropriate depending on 3b and 3c.

However, in such a single tube multicolor fluorescent lamp, the cathode 2
There is a problem that stray light occurs in the periphery of the camera.

For example, if you try to emit monochromatic light by discharging between one anode 3a and cathode 2,
The discharge around the cathode 2 passes through the communication path 6 and diffuses in the inner width direction of the bulb 1, exciting the phosphor films of the other discharge paths 5b and 5c to emit light of other colors, thereby generating stray light.

On the other hand, an example of a medium tube multicolor fluorescent lamp that prevents such stray light is disclosed in Japanese Utility Model Application No. 61-93969.

As shown in FIG. 9, the parts where stray light is generated in the single-tube multicolor fluorescent lamp shown in FIG.
This is designed to block stray light, and although stray light can be prevented, there is a problem in that the light emitting area of the bulb 1 is reduced by the light blocking body 10, resulting in a decrease in lamp efficiency.

In addition, as another conventional example of preventing stray light,
There is one published in Publication No. -93968.

This is constructed as shown in FIG. 10 or 11, and in FIG. 10, a pair of large and small discharge regulating plates 20 and 21 are arranged in the communication path 6 of the single-tube multicolor fluorescent lamp shown in FIG. are doing.

However, a small discharge regulating plate 21 in the shape of a rectangular flat plate is arranged opposite to the cathode 2 with a slight gap in front of the cathode 2 in the communication path 6 in the bulb 1, and furthermore, a small discharge regulating plate 21 in the shape of a rectangular flat plate is placed oppositely in front of the cathode 2 with a slight gap therebetween. A large discharge shielding plate 20 is arranged with a slight gap.

The large discharge regulating plate 20 has a circular through hole 22 formed approximately in the center thereof, and both ends thereof are slightly bent so as to approach the cathode 2 side.

Therefore, for example, when the central anode 3b in the bulb 1 is energized, the electrons emitted from the cathode 2 go around both ends of the small discharge regulating plate 21 and pass through the through hole 22 of the large discharge regulating plate 20 to the central anode 3b. The light flows into the discharge path 5b, reaches the central anode 3b, and excites the phosphor film of the central discharge path 5b, causing it to emit light.

Further, when the anodes 3a and 3c on both sides are energized, electrons from the cathode 2 go around each bent end of the large discharge 1iIJ board 20, flow into the discharge paths 5a and 5c on both sides, and flow into the discharge paths 5a and 5c on both sides, , 3c, respectively.

On the other hand, the medium tube multicolor fluorescent lamp shown in FIG. 11 has each discharge path 5a of the single tube multicolor fluorescent lamp shown in FIG.

The openings on the cathode 2 side of 5b and 5c are closed by a horizontally long rectangular flat plate-shaped large fl electric current regulating plate 30, and this large discharge regulating plate 30 is provided with communication holes 31a and 31b that communicate with the respective discharge paths 5a, 5b and 5c. , 31c are bored respectively.

A horizontally long rectangular flat plate-like small discharge regulating plate 32 is interposed between the large discharge regulating plate 30 and the cathode 2.
2 has its length in the longitudinal direction slightly shorter than that of the large discharge regulating plate 30, and spaces are set on the sides of both ends, and a notch 33 of the required width is cut out at the upper edge of the middle part in the longitudinal direction. ing.

Therefore, for example, when the central anode 3b in the bulb 1 is energized, the electrons emitted from the cathode 2 pass over the notch 33 of the small discharge regulating plate 30 and reach the central communicating hole 3.
1b flows into the central discharge path 5b, reaches the central anode 3b, and excites the phosphor film of the central discharge path 5b to emit light.

Furthermore, when the anodes 3a and 3C on both sides in the bulb 1 are energized, the electrons from the cathode 2 go around both ends of the small discharge regulating plate 32, and pass through the communication holes 31a and 31c on both sides of the large discharge regulating plate 30, respectively. through which the discharge paths 5a on both sides,
5c and reaches the anodes 3a and 3c on both sides,
The phosphor films of the discharge paths 5a and 5c on both sides are excited to emit light of a desired color.

However, in the conventional single-tube multicolor fluorescent lamp configured in this way, a pair of large and small discharge regulating plates 2o, 30, 21, 32
The discharge path is bent, and the through hole 22 and each communication 31a, 3
There is a problem in that the discharge start voltage becomes high because the discharge itself is narrowed down by 1b and 31c.

(Problems to be Solved by the Invention) As mentioned above, stray light occurs in conventional single-tube multicolor fluorescent lamps, and in order to prevent stray light, it is necessary to reduce the luminous display area of the lamp or to reduce the discharge starting voltage. There is a problem that the lamp efficiency is decreased due to a decrease in the lamp efficiency.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a single-tube multicolor fluorescent lamp that suppresses stray light and has good lamp efficiency.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a cathode and a plurality of anodes that are arranged opposite to each other in a bulb, and a plurality of parallel discharge paths that are interposed between the anode and the cathode and that correspond to anode failure. a discharge path regulating body that forms a The present invention is characterized in that a discharge diffusion preventive body is provided on the right side for guiding the discharge to each of the discharge paths.

(Function) For example, when a discharge is generated between one anode and a cathode, the diffusion of the radiation around the cathode becomes 1
is prevented by the body and guided toward the discharge path regulating body.

Therefore, it is possible to suppress the discharge around the cathode from being diffused to the discharge path corresponding to the anode that is not energized, and to suppress the excitation of the phosphor corresponding to the discharge path of the other anode that is not energized. It will be done.

For this reason, only the phosphor film in the discharge path corresponding to the energized anode is excited and emits light, and the light emission of the phosphors in other discharge paths is suppressed, thereby suppressing stray light.

Further, when the present fluorescent lamp is viewed from the display direction, the red light from the red-hot cathode and the blue light from the discharge around the cathode are blocked by the discharge diffusion preventer, so they are not visible and this stray light is suppressed.

Furthermore, according to the present invention, the light emitting area is not reduced by shielding the discharge path with a light shielding member or the like, so that lamp efficiency can be improved.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 7.

FIG. 1 is a half-cut vertical cross-sectional view of an embodiment of the present invention. In the figure, mercury and rare gas are sealed in a glass bulb 40 configured as a cylindrical closed container, and a cathode 4
1 is sealed.

The cathode 41 is installed on the bottom 42 inside the bulb 40 and is covered with a discharge diffusion prevention body 43 in the form of a capped cylinder with an open lower end, so that the outer periphery is circumferentially surrounded and the discharge around the cathode 41 is prevented. The spread of the virus is now regulated.

Further, the discharge diffusion preventive body 43 has a center hole 44 formed approximately in the center of its upper lid portion to allow the discharge to pass through.

As shown in FIG. 2, the outer circumferential surface of the discharge diffusion preventer 43 is fixed and supported by the axially intermediate portion of a support plate 45 erected on the bottom 42, and the upper end of the support plate 45 is located on the inner side. The discharge path regulating body 46 is slightly bent and fixed to the lower end of the cylindrical discharge path regulating body 46 to support the discharge path regulating body 46 .

The discharge path regulating body 46 has an outer cylinder 47 in the shape of an inverted truncated cone with openings at both ends. It is made to face the center hole 44 of the discharge diffusion preventive body 43 with a gap therebetween.

The outer cylinder 47 also has two partition plates 48, for example.
4.8 are divided into four parallel discharge paths 49a, 49b, 49c, and 49d, arranged orthogonally to each other at the center, and the inner peripheral surface of the outer cylinder 47 has a luminescent color for each parallel discharge path 49a to 49d. Each of the outer cylinders 47 is coated with a phosphor film 50 having a different color, so that light of a desired color is emitted upward from the upper end of the outer cylinder 47.

Moreover, each parallel discharge path 498 is provided above the outer periphery of the upper end of the outer cylinder 47.
Four anodes 51a corresponding to ~49d, respectively;
51b, 51C, and 51d are disposed, respectively, and each anode 51a to 51d is a glass sleeve 52a, 52b erected on the bottom 42.

It is supported by 52c and 52d, and is electrically connected to a plurality of external bins 53 via a power supply body inserted inside thereof.

Each external vial 53 is provided to protrude outward from the bottom 42, and two required external vials 53 are electrically connected to both ends of the cathode 41, respectively.

Next, the operation of this embodiment will be described.

For example, when one anode 51a and the cathode 41 are energized to generate a discharge, the radial diffusion of the discharge around the cathode 41 is restricted by the inner peripheral surface of the discharge diffusion preventer 43.

Furthermore, the diameter of the discharge around the cathode 41 is narrowed down by the center hole 44 of the discharge diffusion prevention body 43, and then the parallel discharge path 49a of the discharge path regulating body 46 having the energized anode 51a is formed.
Since the discharge flows in from the lower end of the anode 51a, the discharge flows only into the discharge path 49a having the energized anode 51a, and diffusion to the other parallel discharge paths 491) to 49d is suppressed.

Therefore, the discharge path 4 that connects the anode 51a that is energized
Since the discharge is not diffused to the discharge paths 49b to 49d other than 9a, the discharge path 49a having the energized anode 51a
Only the light emits light, and stray light is suppressed.

In addition, the present fluorescent lamp should be positioned in the display direction (bulb 20 in Figure 1).
When viewed from above), the red light from the red-hot cathode 41 and the blue light from the discharge around the cathode 41 can be shielded from visibility by the discharge diffusion preventer 43, so stray light caused by this can also be suppressed. .

On the other hand, the phosphor film 50 of the discharge path 49 is
It is excited by the discharge passing through the discharge path 49a having the discharge path 49a, and emits light of a desired color.

Therefore, according to this embodiment, since a part of the bulb 40 is not blocked, stray light can be suppressed while maintaining good lamp efficiency.

In the above embodiment, a case was described in which the outer cylinder 47 of the discharge path regulating body 46 was formed in the shape of an inverted truncated cone, but the present invention is not limited to this. For example, as shown in FIG. The outer cylinder 47A' may be formed into a conical shape, and circular discharge inflow openings 47A1 may be provided on the side surface of the conical small diameter portion in correspondence with the number of the parallel discharge paths 49a to 496.

Further, as shown in FIG. 3(B), the outer cylinder 47B may be formed into a cylindrical shape with a bottom, and a circular center hole 47B1 for discharge inflow may be bored in the bottom of the outer cylinder 47B. As shown in (C), a circular opening 47 that communicates with each of the parallel discharge paths 498 to 49d is provided at the bottom of the bottomed cylindrical outer cylinder 47C.
C1 may be drilled respectively, and furthermore, as shown in FIG. 3 (
As shown in D), the outer cylinder 47D may be formed into a square cylinder with openings at both ends.

In the present invention, the discharge path regulating body may be constructed only of a partition plate that partitions the inside of the bulb 40 without using an outer cylinder as shown in FIGS. 8 to 11.

Further, regarding the discharge diffusion prevention body 43, for example, as shown in FIG. 4, a plurality of discharge discharge openings 43A1 may be provided on the outer peripheral surface of the covered cylindrical body 43A.

Further, regarding the shape of the anodes 51a to 51d, the cross section may be approximately fan-shaped 51A as shown in FIG. 5(A), or circular 51B as shown in FIG. 5(B).

Furthermore, as shown in FIG. 6, the outer cylinder 47 of the discharge path regulating body 46 is made of a good electrical conductor, and
The outer cylinder 47 is electrically connected to the external bottle 53 through the casing 47, and the outer cylinder 47 is configured to be freely energized, and almost the entire surface of the outer cylinder 47 is coated with an electrically insulating coating 71 made of ceramics, glass, etc., as shown in FIG. It's okay.

According to this embodiment, the external f? When a required voltage is applied to 147, an electric field is generated in the discharge path regulating body 46, and each parallel discharge path 49a to 4
An electric field is applied along the anodes 51a to 51d.
The discharge space between the anode 41 and the cathode 41 becomes ionized, and the discharge starting voltage applied to the anodes 51a to 51d can be reduced.

Further, since the outer cylinder 47 is coated with ceramic or glass, release of impurity gas from the outer cylinder 47 can be prevented.

Further, the partition plates 48, 48 may be energized in the same way as the outer cylinder 47, or may be coated with ceramics or glass. Furthermore, it is sufficient to simply use a partition plate instead of using an outer cylinder as the discharge regulating body.

〔Effect of the invention〕

As explained above, since the present invention is provided with a discharge diffusion prevention body that restricts the diffusion of discharge around the cathode, it is possible to suppress the diffusion of discharge to the discharge path having the anode when the current is not being applied, and also to display the display. It is possible to suppress the visibility of the red light of the cathode and the blue light around the cathode from the direction1.
This has the effect of eliminating stray light bodies.

[Brief explanation of the drawing]

FIG. 1 is a half-cut cross-sectional view showing the overall configuration of an embodiment of a single-tube multicolor fluorescent lamp according to the present invention, FIG. 2 is a perspective view of the main part of FIG. 1, and FIGS. ) is a perspective view showing a modified example of the outer cylinder of the discharge path regulating body shown in FIG. 1, FIG. 4 is a perspective view of a modified example of the discharge diffusion preventing body shown in FIG. 1, and FIG. 5 (
Δ>, (B) is a plan view showing a modified example of the anode shown in FIG. 1, FIG. 6 is a half-cut vertical cross-sectional view showing an embodiment of the present invention, and FIG. 7 is an enlarged view of the main part of FIG. 6. 8 to 11 are perspective views showing conventional single-tube multicolor fluorescent lamps, respectively. /10... Valve, 41... Cathode, 43...
Discharge diffusion prevention body, 44... Center hole, 46... Discharge path regulating body, 47... Outer tube, 49a-49d... Parallel discharge path, 51a-51d... Anode. Applicant's agent: Hatano Kujuku Prisoner

Claims (1)

[Scope of Claims] 1. A cathode and a plurality of anodes arranged oppositely in a valve, and interposed between the anode and the cathode,
A discharge path regulator that forms a plurality of parallel discharge paths corresponding to the number of anodes, a phosphor film that is attached to a surface facing each discharge path and emits a different color corresponding to each discharge path, and a phosphor film that emits a different color corresponding to each discharge path; 1. A single-tube multicolor fluorescent lamp, comprising a discharge diffusion preventer that prevents diffusion of the discharge and guides the discharge to each of the discharge paths. 2. The discharge path regulating body is configured to be freely energized, and
2. The single-tube multicolor fluorescent lamp according to claim 1, wherein substantially the entire surface of the lamp is coated with an electrically insulating film.