JPS61211955A - Color tone variable fluorescent lamp device - Google Patents

Abstract

PURPOSE:To obtain luminescence having clear color tone by a method in which one cathode and plural anodes are provided in a single discharge tube while phosphor films having different luminous colors are formed on the discharge tube inner wall corresponding to positive light columns generated by discharge between the cathode and the respective anodes. CONSTITUTION:Discharge is to be done between the cathode 5 and either one of the anodes 6a-6c while said discharge paths are to reach one anode from inside a cylindrical body 4 through the upper end opening of the cylindrical body 4 thus generating positive light columns. Then, when conduction to the anodes 6a-6c is changed over by turns, discharge between the cathode 5 and the respective anodes 6a-6c is changed over by turns so that the positive light columns move by turns inside a globe 3 in the peripheral direction. On the inside wall of the globe 3, the phosphor films 7a-7c omitting the red, blue and green light corresponding to the anode columns generated between the cathode 5 and the respective anodes 6a-6c are separately spread in the peripheral direction.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a variable tone fluorescent lamp device in which the color of emitted light can be arbitrarily changed using a single lamp.

[Technical background of the invention and its problems]

Conventionally, as a fluorescent lamp device that can arbitrarily change the color tone,
There is a system that uses three fluorescent lamps that emit red, blue, and green light, and synthesizes the light colors from each lamp by adjusting the amount of discharge current of each lamp. However, this method requires three lamps and three sets of lighting circuits, so the entire device is large in size, has many parts, and is expensive.

It is also known that a single discharge tube is used for a set of three lamps, and a multilayer phosphor film is formed on the inner wall of the discharge tube that emits different light in response to different excitation ultraviolet rays. In this method, the color tone of the phosphor film corresponding to the excitation ultraviolet light is obtained by controlling the discharge current and changing the excitation ultraviolet light. In this case, even if the excitation ultraviolet light is changed, not only the phosphor film corresponding to this ultraviolet ray but also other phosphor films are inevitably slightly excited, and the color tones are not clearly separated and the color tones are different. There is a problem with the variable range being extremely narrow.

[Purpose of the invention]

The present invention was made in view of the above-mentioned circumstances, and its purpose is to be able to change the clear color tone arbitrarily even though it is a single lamp, to have a simple configuration, and to have a wide variable range. The present invention aims to provide a variable tone fluorescent lamp device.

[Summary of the invention]

In order to achieve the above object, the present invention provides one cathode and a plurality of anodes in the discharge tube, and at least one cathode on the inner wall of the discharge tube corresponding to the positive light column generated between the anode and the cathode. forms a phosphor film with different luminescent colors,
The present invention is characterized in that the emitted light color of the entire discharge tube is adjusted by controlling the residence time of each of the positive pillars so that the positive pillars are moved by sequentially switching the energization to each of the anodes.

[Embodiments of the invention]

The present invention will be described below based on an embodiment shown in the drawings.

In the figure, reference numeral 1 denotes a discharge tube, which is constructed by airtightly joining a glass globe 3 to a glass substrate 2. Board 2
A glass cylindrical body 4 is joined to the center of the cylindrical body 4, and a cathode 5 is provided on the substrate 2 within this cylindrical body 4. On the substrate 2 outside the cylindrical body 4, for example, three anodes 6a, 6b are arranged at intervals in the circumferential direction.

6C is installed.

The cathode 5 and any one anode 6m.

6b and 6e, so that discharge occurs between them.
This discharge path extends from the inside of the cylindrical body 4 to one anode through an opening at the upper end of the cylindrical body 4, thereby generating a positive column. and anode 6m,
When the energization to 6b * 6a is sequentially switched, the discharge between the cathode 5 and each anode 6m + 6 b r 6 c is sequentially switched, so that the positive column moves sequentially in the circumferential direction within the globe 3. .

Each anode 6a * 6b is provided on the inner wall surface of the globe 3.
Opposing the anode column generated between p6c and cathode 5, red,
On the back, phosphor coatings 78° 7b and 7c that emit green light are painted differently in the circumferential direction. Also, a predetermined amount of mercury and a starting rare gas are sealed in the glove 3.

A cover 8 is joined to the substrate 2 side of the discharge tube 1, and a cap 9 is attached to the end of the cover 8. Inside the cover 8, a lighting switching control circuit and a variable color adjustment circuit are housed.

This circuit has a configuration shown in FIG. 2, for example.

That is, 10a, 10b, and 10c are transistors, and these transistors 10m.

The emitters 10, b, and 10c are connected to the glass pole of the power source through the cap 9.

The collectors of the transistors 10a, 10b, 10c are C
It is connected to the anode 6m + 6b H6c via the R paralast circuit 11m, 11brllc.

Further, the pace of the transistors 10a, 10b, and 10e is determined by the CR time constant circuits 12m and 12b.

12c and current adjustment resistor I Ja e 13b *
It is connected to the collector of an adjacent transistor via 13c.

The variable resistances of the CR time constant circuits 12h, 12b, and 12e are adjusted by a color tone control lever 14m214b#14e provided on the cover 8 shown in FIG. 14 m, 14
By the operation of b, 14a, each anode 6m, 6b
, 6a is adjusted.

When the inductor Lande device of the embodiment with such a configuration is connected to a DC power source through the base 9, a discharge is generated between the cathode 5 in the center and one of the anodes, 9, in the periphery, for example 6&. , this discharge becomes a positive column that bypasses the cylindrical body 4.

This discharge excites mercury vapor and emits ultraviolet light,
The phosphor coating closest to this positive column, for example 7
To excite a, light of the color of the phosphor coating is emitted.

The discharge time of the anode 6a, that is, the residence time of the positive light column generated at the anode 6a, is determined by the resistance value of the variable resistor of the CR time constant circuit 12a, and the time constant is controlled by operating the lever 14&. When the time set by this CR time constant circuit 12a has elapsed, the next adjacent anode, for example 6b and cathode 5
A discharge occurs between them, and the phosphor coating 7b corresponding to this positive column emits light.

Thereafter, in the same manner, the phosphor films Ill 7e17
m, 7b is emitted.

By adjusting the levers 14m, 14b, and 14c, the residence time of each positive column can be adjusted to 24 times or more in 1 second.
Moreover, if you set equal time intervals, due to the afterimage phenomenon,
The light emitted from the globe 3 is a combination of the three primary colors of red, blue, and green, that is, white light.

Furthermore, for example, by increasing the residence time of the sunlight column in the red phosphor coating, the light emitted from the lamp will have a stronger red color, and similarly, it is possible to strengthen each of the fruits, vegetables, and edge threads.

Therefore, with this lamp, the color tone can be controlled even though it is a single lamp.
7b and 7e, the degree of change in color tone becomes clear and highly accurate adjustment can be performed.

For this reason, the fluorescent lamp device of the above embodiment is convenient for use in store lighting and the like.

Note that the present invention is not limited to the above embodiment. For example, the number of anodes is not limited to three; when adjusting the three colors of red, blue, and green as in the above embodiment, the number of anodes may be three. It is sufficient if the number is a multiple, and the number of anodes corresponding to the color whose brightness is desired to be increased may be increased. Furthermore, the combination of phosphors used is red,
The combination is not limited to the three types of phosphors, blue and green, but may be a combination of only two types. Furthermore, various modifications can be made to the shape, structure, color tone variable adjustment circuit, etc. of the lamp.

〔Effect of the invention〕

As explained above, according to the present invention, one
Since a plurality of cathodes and a plurality of anodes are provided, and at least one phosphor film with a different luminescent color is formed on the inner wall of the discharge tube in correspondence with a positive column generated by discharge between each of these anodes and cathodes, a single phosphor film is formed. By energizing each anode, it is possible to emit light with a clear color even though it is only one rung.

Moreover, since the residence time of each positive light column is controlled, it is possible to obtain light of a composite color other than the primary colors, and a wide color range and highly accurate color tone control are possible.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, with FIG. 1 being a partially cutaway perspective view and FIG. 2 being a circuit diagram. 1... Discharge tube, 3... Globe, 4... Cylindrical body,
5... cathode, 6 m, 6 b, 6 c-positive,
Koshiki, 7a r 7b+7c... phosphor coating, 8...
・Cuckoo, 9...cap, 10 a, IOb, 1
0c=・)Ran resistor, ZJa. 1 lb, 11e-Crt parast circuit, 12a. 12b, 12cm CR time constant circuit, l 4 a e
14b +14c...Lever for color tone control. Applicant's representative Patent attorney Takehiko Suzue Figure 1

Claims (1)

[Claims] One cathode and a plurality of anodes are provided in the discharge tube, and at least one phosphor coating with a different emission color is provided on the inner wall of the discharge tube, corresponding to the positive column generated between each of the anodes and cathodes. By sequentially switching the energization to each of the anodes, the positive column is moved so that the phosphor coating corresponding to the positive column emits light, and the energization time to each anode is controlled to A color-tone variable fluorescent lamp device characterized in that the luminescent color of the entire discharge tube is adjusted by changing the residence time of the positive column.