JPH06310099A - Variable color electric discharge lamp device - Google Patents

Abstract

PURPOSE:To provide a variable color electric discharge lamp device wherein the color of light can be adjusted by a single electric discharge lamp and negative glows can be nearly equally generated in a bulb to improve the color rendering property of the lamp. CONSTITUTION:A bulb 1 has its inner part provided with a pair of first electrodes 3a, 3b, with the outer circumferential face of its wall provided with three pairs of second electrodes 4a to 4f. The bulb 1 has a fluorescent material applied to the inner circumferential face of its wall so as to form a fluorescent layer 2. Moreover, the bulb 1 has mercury vapor and neon both as respective light emitting gases filled thereinto. When electric discharge is generated between the first electrodes 3a, 3b, mercury vapor is chiefly ionized and excited to emit ultraviolet rays which are changed into respective visible rays by the fluorescent layer 2. When electric discharge on the other hand is generated between the second electrodes 4a to 4f negative glows can be nearly equally generated in the bulb 1 and therefore neon emits light in the negative glows. High-frequency voltages applied respectively by high-frequency power sources 5a, 5b, 5c are accordingly adjusted in an emission light quantity adjuster unit 6 so that the color of color mixture light may be adjusted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention enables toning in a single bulb by using a discharge lamp that utilizes the luminescent color of the luminescent substance of a fluorescent material and the luminescent color of a rare gas in a negative glow. The present invention relates to the variable color discharge lamp device.

[0002]

2. Description of the Related Art Conventionally, as a variable color discharge lamp device having a variable emission color, a pixel of a large screen color display device is formed by a discharge lamp, as described in JP-A-61-55851. Things are known.
As shown in FIG. 8, this discharge lamp is provided with a common cathode 11 and a plurality of anodes 12a, 12b, 12c in a bulb 1 and a plurality of discharges between the respective anodes 12a, 12b, 12c and the common cathode 11. Channels are formed in one bulb 1, and fluorescent materials having a single emission color are provided corresponding to each discharge path, and at least two fluorescent materials having different emission colors are provided in one bulb 1. It is a thing. Therefore, if the ratio of the voltage application time to each discharge path is changed by the switch means 13, the ratio of the amount of light emission in each discharge path can be adjusted to adjust the color of the mixed color light.

On the other hand, as shown in FIG. 9, one valve 1
Instead of forming a plurality of discharge paths inside, a plurality of discharge lamps 14a, 14b, 14c, 14d having different emission colors are formed.
Is provided, and each discharge lamp 14a, 14b, 14c, 14d
There is also proposed a variable color light source device capable of adjusting the color of mixed color light by adjusting the ratio of the light output of the control circuit 15 (see Japanese Patent Application Laid-Open No. 3-222292).

In the former conventional configuration described above, since it is necessary to control so that a voltage is sequentially applied to each discharge path, there is a problem that the switching control of the discharge path becomes complicated and the circuit structure becomes complicated. Further, since a plurality of discharge paths are provided in one bulb 1, there is a problem that a partition wall between the discharge paths is required, the structure of the bulb 1 is complicated, and the cost is increased. Furthermore, since it is used as a pixel of a large-screen color display device, the light emitting area is too small for lighting, and conversely, if the light emitting area is increased, the light output from each discharge path can be sufficiently mixed. No
There is also the problem that color unevenness occurs.

Also in the latter conventional configuration, since the ratio of the light output of the plurality of discharge lamps 14a, 14b, 14c, 14d is adjusted, the circuit configuration becomes complicated, and moreover, the plurality of discharge lamps 14a, 14b, 14c, 14d are provided. Since it is necessary, there is a problem that the size of the entire device is increased and the cost is increased. In order to solve the above-mentioned problem, as shown in FIG. 10, a fluorescent material is applied to the inner wall of one bulb and two kinds of light emitting gas are enclosed, and a pair of first bulbs is provided in the bulb 1. Electrodes 3a and 3b of the valve 1 are spaced apart and opposed to each other, and a pair of second electrodes 4a and 4b are opposed to the tube wall of the valve 1, and high frequency power supplies 5a and 5b are individually connected to the respective electrodes. , Each high frequency power source 5a,
By adjusting the output of 5b with the light emission amount adjusting unit 6,
There is a variable color discharge lamp device capable of adjusting the color of mixed color light. That is, the visible light wavelength of the first light emitting gas that is mainly ionized and excited by the discharge between the first electrodes 3a and 3b and converted into visible light by the fluorescent substance, and mainly the second electrode 4a, 4b
The wavelength of visible light emitted by the second light emitting gas that is ionized and excited in the negative glow due to the discharge between the two is different, and the ratio of the amount of emitted light is adjusted by the emission amount adjusting unit 6 to adjust the color. Of.

[0006]

In the conventional structure shown in FIG. 10 described above, since the variable color discharge lamp can be formed by the discharge lamp A including one bulb 1, the structure is simpler than other conventional structures. There is a feature that becomes. However, the potential difference generated between the second electrodes 4a and 4b becomes smaller as the distance from the point where the lead wire 16 connected to the high frequency power source 5b is connected increases, and the discharge intensity is generally proportional to the applied voltage. There is a problem that the amount of light emission in the negative glow portion between the electrodes 4a and 4b is not uniform and color unevenness occurs.

The present invention is intended to solve the above-mentioned problems, and two types of light emission gas are used so that the emission color of the fluorescent substance due to luminescence and the emission color of the light emitting gas in the negative glow are different. By enclosing the light emitting gas in one bulb, it is possible to adjust the color with one discharge lamp, and the emission of the light emitting gas in the negative glow is generated almost uniformly in the bulb. An object of the present invention is to provide a variable color discharge lamp device capable of enhancing color rendering properties.

[0008]

In order to achieve the above-mentioned object, the invention of claim 1 is at least a first pair for discharging.
Electrodes spaced apart from each other by a distance sufficiently longer than the negative glow generated by the discharge between the electrodes, and at least a pair of second electrodes for discharge separated by a distance sufficiently shorter than the distance between the first electrodes. A first light emitting gas that emits light that is provided with a fluorescent substance and is mainly ionized / excited by a discharge between the first electrodes and converted into visible light by the fluorescent substance, and mainly between the second electrodes A discharge lamp having a bulb filled with a second light emitting gas that emits visible light having a wavelength different from that of visible light emitted from the fluorescent substance by being ionized and excited in the negative glow generated by the discharge in First and second power supply means for applying a voltage to the second and second electrodes, respectively, and a color adjusting means for adjusting the amount of visible light emitted by the fluorescent substance and the amount of visible light emitted in the negative glow. Negative glow Characterized by comprising a negative glow uniformly generating means substantially give uniformly occur within.

The invention of claim 2 is characterized in that, in the invention of claim 1, the second electrode is formed by attaching a thin film conductor to the outer peripheral wall of the valve. According to a third aspect of the invention, in the first or second aspect of the invention, the negative glow uniform generation means is a second electrode formed of a plurality of pairs of electrodes, and at least one power supply for applying a voltage to each electrode. And a second power supply means having

The invention of claim 4 is claim 1 or claim 2.
In the invention of claim 2, the negative glow uniform generation means connects a pair of end portions having a larger distance between the end portions of the two poles of the second electrode to the both terminals of the second power supply means. It is characterized by consisting of. According to a fifth aspect of the present invention, in the third aspect of the present invention, the negative glow uniform generating means connects one pole of the plurality of pairs of second electrodes by mutually inserting impedances and connects the other pole to the first electrode. It is characterized as being common with.

According to a sixth aspect of the invention, in the invention of the second aspect, the negative glow uniform generating means has one pole of the second electrode in common with one pole of the first electrode and the other of the second electrodes. It is characterized in that the width of the second electrode is expanded in proportion to the distance between the pole and the common pole. The invention of claim 7 is the same as claim 1.
Alternatively, in the invention of claim 2, the negative glow uniform generating means includes a plurality of second electrodes which are arranged so as to be adjacent to each other with the surface including the center line of the bulb interposed therebetween, and the second electrode which is adjacent to the plurality of second electrodes. It is characterized by comprising a second power supply means for applying a voltage between them and a switching means for sequentially switching the second electrode for applying a voltage.

According to an eighth aspect of the present invention, in the first aspect of the invention, the coil is disposed in the vicinity of the first electrode so that an axial direction is directed to a portion of the first electrode where negative glow occurs, and an exciting current is supplied. It is characterized in that the power supply means for connecting to the coil is connected.

[0013]

According to the first aspect of the invention, at least a pair of first discharge electrodes are provided at a distance sufficiently longer than the negative glow generated by the discharge between the electrodes, and at least a pair of first discharge electrodes are provided. The second electrode is provided with a space sufficiently shorter than the space between the first electrodes, and the fluorescent substance is built in. The fluorescent substance is ionized and excited mainly by the discharge between the first electrodes to be converted into visible light by the fluorescent substance. First to emit light
And a second light emitting gas that emits visible light of a wavelength different from that of the visible light emitted from the fluorescent substance by being ionized / excited in the negative glow mainly generated by the discharge between the second electrodes. A discharge lamp having an enclosed bulb, first and second power supply means for applying a voltage to the first and second electrodes, respectively, an amount of visible light emitted by a fluorescent substance and a visible light generated in a negative glow. Since the color adjusting means capable of adjusting the light emission amount and the negative glow uniform generating means for generating the negative glow substantially uniformly in the bulb are provided, the emission color mainly due to the luminescence of the fluorescent substance between the first electrodes is provided. And two types of light-emitting gas are enclosed in a bulb so that the emission color of the light-emitting gas in the negative glow mainly between the second electrode and Emission of fluorescent material from the lamp It is possible to obtain a two-color luminescent colors of the color and the negative glow of the luminous color. Moreover, by providing the color adjusting means capable of adjusting the amount of light emitted by the luminescence of the fluorescent substance and the amount of light emitted from the site where the negative glow occurs, the emission color of the fluorescent substance caused by the luminescence and the negative glow It is possible to adjust the light quantity ratio to the emission color, and as a result, it is possible to adjust the color of mixed color light. Furthermore, the second
Since the negative glow uniform generation means for generating the negative glow between the electrodes of the negative glow in the bulb is provided substantially uniformly, the light emission of the light emitting gas in the negative glow is produced substantially uniformly in the bulb to improve the color rendering. It can be increased.

According to the second aspect of the invention, since the second electrode is formed by attaching a thin film conductor to the outer peripheral wall of the valve, the airtightness of the valve is improved and the valve is easily manufactured. It will be. According to a third aspect of the present invention, which is an embodiment of the means for uniformly generating negative glow, it is provided with a second electrode formed of a plurality of pairs of electrodes, and at least one power source for applying a voltage to each electrode. Since it comprises two power supply means, the potential difference between the electrodes can be made substantially uniform, and the generation of negative glow in the valve can be made uniform.

According to a fourth aspect of the present invention, there is provided an embodiment of the means for uniformly generating negative glow, wherein the end portions of the second electrode having a larger distance between the end portions of the two poles. Since the pair is connected to both terminals of the second power supply means, the potential difference between the electrodes can be made substantially uniform and the generation of negative glow in the valve can be made uniform. According to a fifth aspect of the invention, which is an embodiment of the negative glow uniform generating means,
Since one pole of the plurality of pairs of second electrodes is connected by inserting impedances into each other and the other pole is common to the first electrode, the potential difference generated between the electrodes is made inversely proportional to the interval between the electrodes. The intensity of the discharge generated between the first electrode and the second electrode can be made substantially uniform, and the generation of negative glow in the bulb can be made uniform.

According to a sixth aspect of the present invention, there is provided an embodiment of the negative glow uniform generating means, wherein one pole of the second electrode is common to one pole of the first electrode and the other of the second electrodes is the same. Since the width of the second electrode has been expanded in proportion to the distance between the common electrode and the common electrode, the decrease in discharge due to the increased distance between the electrodes is compensated by expanding the width of the electrode so that the negative glow in the bulb is reduced. It is possible to uniformize the occurrence of.

According to a seventh aspect of the present invention, which is an embodiment of the negative glow uniform generating means, a plurality of second glow nozzles are arranged so as to be adjacent to each other with the surface including the center line of the valve interposed therebetween. Since the electrode, the second power source means for applying a voltage between the adjacent second electrodes, and the switching means for sequentially switching the second electrode for applying a voltage, the position where the negative glow occurs in the valve It is possible to uniformize the generation of negative glow in the valve by changing the ratio.

According to the structure of the invention of claim 8, the coil is arranged in the vicinity of the first electrode so that the coil is axially directed to the portion of the first electrode where the negative glow occurs, and the power supply means for supplying the exciting current is the coil. The negative glow generated near the cathode of the first electrode can be diffused by the magnetic field generated in the coil.
As a result, it is possible to suppress the light emission of the light emitting gas in the negative glow generated between the first electrodes and prevent the occurrence of color unevenness in the bulb.

[0019]

【Example】

(Embodiment 1) In this embodiment, as shown in FIG. 1, first electrodes 3a and 3b are provided in both ends in the direction along the center line of a straight tube-shaped valve 1, and the outer surface of the valve 1 is provided on the outer surface thereof. The second electrode 4 is disposed so as to face each other with the surface including the above-mentioned center line interposed therebetween.
The discharge lamp A is configured by providing a to 4f. Also,
The second electrodes 4a to 4f are formed by attaching a thin-film conductor to the outer peripheral surface of the tube wall of the valve 1, and the electrodes 4a, 4c,
The electrode 4e is provided on the same side with respect to the surface including the center line, and the electrode 4a and the electrode 4b, the electrode 4c and the electrode 4d, and the electrode 4 are provided.
e and the electrode 4f are opposed to each other with the surface including the center line of the bulb 1 interposed therebetween. Further, a fluorescent layer 2 coated with a fluorescent material is formed on the inner peripheral surface of the bulb 1 of the bulb 1, and mercury vapor and a rare gas as light emitting gases are enclosed in the bulb 1. A high frequency voltage is applied to the first electrodes 3a and 3b from a high frequency power source 5a which is a power source means, and a high frequency voltage is applied to the second electrodes 4a to 4f from a high frequency power sources 5b and 5c which is also a power source means. Here, the second electrode 4c is connected to one terminal of the high-frequency power supply 5b, and the second electrodes 4b and 4f are connected to the other terminal thereof, and the second electrode is connected to one terminal of the high-frequency power supply 5c. 4a and 4c, and the second electrode 4d is connected to the other terminal. In addition, the first electrode 3
A light emission amount adjusting section 6 which is a color adjusting means for adjusting the applied voltage between a and 3b and the applied voltage between the second electrodes is connected to the high frequency power supplies 5a, 5b and 5c. The high-frequency power supplies 5a, 5b, 5c and the light emission amount adjusting section 6 constitute a lighting circuit 7. As the high frequency power supplies 5a, 5b and 5c, either one having a fixed output frequency or one having a variable output frequency may be used.

In the above structure, when a high frequency voltage is applied to the first electrodes 3a and 3b and the second electrodes 4a to 4f, negative glow is generated near the first and second electrodes that are negative electrodes at each time point. However, since the distance between the first electrodes 3a and 3b is set to be sufficiently longer than the length of the negative glow generated by the discharge between both electrodes, the first electrodes 3a and 3b are
Mercury vapor is ionized / excited in the positive column portion generated during b to generate ultraviolet rays, and the ultraviolet rays are converted into visible rays by the fluorescent layer 2 to generate light output to the outside of the bulb 1. On the other hand, the distance between the opposing electrodes of the second electrodes 4a to 4f is set to be sufficiently shorter than the distance between the first electrodes 3a and 3b, and these second electrodes have a plurality of pairs of electrodes. By dividing the electrodes, variations in potential difference due to the positions of the electrodes are eliminated. Therefore, the electrodes 4a, 4e, and 4 of the second electrode
A negative glow occurs between the electrode 4c and the electrode 4c and between the electrode 4b and the electrode 4f, and by switching the application time of the high-frequency voltage from the high-frequency power supplies 5b and 5c, or by applying the high-frequency voltage at the same time, the valve 1 is substantially uniform in the valve 1. It can cause a negative glow. That is, the second electrodes 4a to 4f and the high frequency power supplies 5b and 5c constitute a so-called negative glow uniform generation means. Although the second electrode is composed of three pairs of electrodes in this embodiment,
The number of electrodes is not limited to this.

Noble gas is ionized in the negative glow.
When excited, it emits light, and the light output of the emission color peculiar to the type of rare gas is generated from the site where the negative glow is generated. If, for example, neon is selected as the rare gas, a reddish emission color is obtained from the site where the negative glow occurs. In short, at the site where the positive column is generated between the first electrodes 3a and 3b, the emission color mainly obtained by the luminescence of the fluorescent layer 2 is obtained, and the second electrodes 4a to 4f constituting the negative glow uniform generation means are obtained. In the negative glow part which is generated almost uniformly in the bulb 1, the emission color mainly from the rare gas is obtained. That is, by selecting the two emission colors so as to be different from each other, it is possible to obtain an emission color different from both the emission colors of the negative glow and the fluorescent layer 2 as the mixed color light.

The amount of light emitted by the fluorescent layer 2 is adjusted by adjusting the applied voltage and frequency between the first electrodes 3a and 3b, and the amount of light emitted by the rare gas is changed by the second electrode 4a.
Since it can be changed by adjusting the applied voltage or frequency between 4 f and 4f, by adjusting at least one of the applied voltage and frequency in the lighting circuit 7, the emission color due to the negative glow and the fluorescent layer 2 It is possible to adjust the light amount ratio with the emission color of, and as a result, it is possible to adjust the color of mixed color light.

(Embodiment 2) In this embodiment, the construction of the second electrode is different from that of the first embodiment. As shown in FIG. 2, the second electrode is composed of a pair of electrodes 4a and 4b, and the end portions of the electrode 4a and the end portion of the electrode 4b which are opposed to each other with the surface perpendicular to the center line of the bulb 1 interposed therebetween. The lead wire 16 connected to the lighting circuit 7 is connected to.

With the above-described structure, the potential difference generated between the second electrodes 4a and 4b also serving as the negative glow uniform generating means can be made substantially uniform in the longitudinal direction of the bulb 1. As a result, the negative glow is generated substantially uniformly in the bulb 1, and the light emission due to the negative glow is made substantially uniform in the bulb 1, so that the color rendering of the discharge lamp A can be improved. Other configurations and operations are the same as the first embodiment.
Is the same as.

(Embodiment 3) In this embodiment, the constructions of the first and second electrodes are different from those of the first and second embodiments. As shown in FIG. 3, second electrodes 4a, 4b, 4c, 4d, 4e are provided on the outer peripheral surface of the bulb 1 on the same side with respect to the surface including the center line of the bulb 1, and adjacent electrodes Is the impedance Z ₁ , Z ₂ , Z ₃ , Z ₄
Connected by. Then, the high frequency power supply 5a is connected to the first electrodes 3a and 3b, and the high frequency power supply 5b is connected to the impedance Z ₄ and the first electrode 3a.

With the above structure, the second electrodes 4a, 4b, 4c, 4d, 4e form a pair with the first electrode 3a, and a high frequency voltage is applied from the high frequency power supplies 5a, 5b to the first electrode 3a. Discharge occurs between 3a and 3b and between the second electrodes 4a, 4b, 4c, 4d and 4e and the first electrode 3a. Here, the intensity of the discharge is inversely proportional to the distance between the electrodes, and the intensity of the discharge generated between the first electrode 3a and the second electrode 4e having the widest distance between the electrodes is the weakest.
The first electrode 3a and the second electrode 4 having the smallest distance between the electrodes
The intensity of the discharge generated between the second electrode and a is the strongest, but the impedance between the second electrodes is Z ₁ ,
Since Z ₂ , Z ₃ and Z ₄ are inserted, the first electrode 3
The narrower the distance from a, the more the voltage drop due to the impedance increases, and the difference in discharge intensity due to the distance between the electrodes can be canceled by the above voltage drop, so that a negative glow can be generated substantially uniformly in the bulb 1. Other configurations and operations are similar to those of the first embodiment. In this embodiment, the second electrode is composed of five electrodes, but the number of electrodes is not limited to this.

The second electrode is replaced by the five electrodes 4a, 4
Instead of being formed by b, 4c, 4d, and 4e, as shown in FIG. 4, the second electrode 4 is formed so that the thickness thereof uniformly decreases in the longitudinal direction of the bulb 1, and the thickest end portion is formed. The voltage drop in the longitudinal direction of the bulb 1 may be increased by connecting the lead wire 16 from the lighting circuit 7 to the same as in the case of FIG. 3 described above.

(Embodiment 4) In this embodiment, as shown in FIG. 5, a second electrode 4 formed on the outer peripheral surface of the tube wall of the valve 1 and a first electrode 3a provided inside the valve 1 are provided. The width of the second electrode 4 is increased in proportion to the distance.
Then, since the intensity of the discharge generated between the second electrode 4 and the first electrode 3a increases in proportion to the width of the second electrode 4, the discharge between the second electrode 4 and the first electrode 3a increases. It is possible to cancel the decrease in discharge intensity due to the interval of 2 by widening the width of the second electrode 4 and to generate a negative glow substantially uniformly in the bulb 1. Other configurations and operations are similar to those of the first embodiment.

(Embodiment 5) In this embodiment, as shown in FIG. 6 (a), eight divided second electrodes 4a to 4h are formed on the outer peripheral surface of a cylindrical valve 1, and FIG. As shown in b), the electrodes 4a to 4h are individually connected to the lead wires 16a to
At 16h, it is connected to the light emission amount adjusting unit 6 of the lighting circuit 7 to form a negative glow uniform generating means. And the second electrode 4
In a to 4h, the discharge occurs between the adjacent electrodes, and the electrodes where the discharge occurs are sequentially switched in the light emission amount adjusting unit 6. That is, in this case, the light emission amount adjusting section 6 also serves as the switching means. As a result, the negative glow portion moves sequentially in the circumferential direction of the valve 1, and the negative glow in the valve 1 can be generated substantially uniformly. Other configurations and operations are similar to those of the first embodiment.

(Embodiment 6) In the configurations of the above-described Embodiments 1 to 5, an electrode which becomes a negative electrode at each time when a high frequency voltage is applied to the first electrodes 3a and 3b (in FIG. 7, 3a becomes a negative electrode). The negative glow has occurred in the vicinity of Since the rare gas also emits light due to the rare gas, the negative glow in the bulb 1 is slightly deviated from the substantially uniform state by overlapping with the negative glow by the second electrode 4 in the vicinity of both longitudinal ends of the bulb 1. The color change may occur in the longitudinal direction of the bulb 1.

Therefore, in this embodiment, as shown in FIG. 7, the coil 8 is arranged in the vicinity of the first electrode 3a in the structure of each of the above-described first to fifth embodiments, and the axis of the coil 8 is set. Is toward the site where the negative glow is occurring. Then, an exciting current is supplied to the coil 8 by a DC power supply 9 which is a power supply means. In the above configuration, the negative glow portion can be diffused by causing the magnetic field generated in the coil 8 to act on the negative glow portion in the valve 1. As a result, the color change of the emission color in the longitudinal direction of the bulb 1 can be suppressed.

The structure of the first electrode in the present invention is not limited to the structures of Examples 1 to 6, and may be an internal electrode or an external electrode. In the case of the internal electrode, it may be either a hot cathode type having a filament or a cold cathode type having no filament. Further, although a high frequency power source is used as the power source means, even if another power source such as a direct current power source is used, the light quantity ratio between the emission color from the negative glow and the emission color from the fluorescent layer is similarly adjusted to adjust the color of mixed color light Is something that can be done.

[0033]

According to the first aspect of the present invention, at least a pair of first discharge electrodes are provided at a distance sufficiently longer than the negative glow generated by the discharge between the electrodes, and at least a pair of first discharge electrodes are provided. The second electrode is provided with a space sufficiently shorter than the space between the first electrodes, and the fluorescent substance is built in. The fluorescent substance is ionized and excited mainly by the discharge between the first electrodes to be converted into visible light by the fluorescent substance. The first light emitting gas which emits the emitted light and the visible light of a wavelength different from that of the visible light emitted from the fluorescent substance by being ionized and excited mainly in the negative glow generated by the discharge between the second electrodes. A discharge lamp having a bulb filled with a second light emitting gas, first and second power supply means for applying a voltage to the first and second electrodes, respectively, and an amount of visible light emitted by the fluorescent substance. And occur in negative glow Since the color adjusting means capable of adjusting the emission amount of visible light and the negative glow uniform generating means for causing the negative glow to be generated substantially uniformly in the bulb are provided, the luminescence of the fluorescent substance mainly between the first electrodes is provided. By enclosing two kinds of light emitting gas in the bulb so that the light emitting color of the light emitting gas and the light emitting color of the light emitting gas mainly in the negative glow between the second electrodes are different, Two emission colors, the emission color of the fluorescent material and the emission color of negative glow, can be obtained from the individual discharge lamps. Moreover, by providing the color adjusting means capable of adjusting the amount of light emitted by the luminescence of the fluorescent substance and the amount of light emitted from the site where the negative glow occurs, the emission color of the fluorescent substance caused by the luminescence and the negative glow It is possible to adjust the light intensity ratio with the emission color, and as a result,
There is an effect that the color of mixed color light can be adjusted by one discharge lamp. Further, since the negative glow uniform generating means for causing the negative glow between the second electrodes to be generated substantially uniformly in the bulb is provided, the light emission of the light emitting gas in the negative glow is generated to be substantially uniform in the bulb. As a result, the color rendering of the discharge lamp can be improved.

According to the second aspect of the invention, since the second electrode is formed by attaching a thin film conductor to the outer peripheral wall of the valve, the airtightness of the valve is improved and the valve is easily manufactured. As a result, the life and reliability of the valve are improved and the cost is reduced. According to the invention of claim 3, the negative glow uniform generation means comprises a second electrode formed of a plurality of pairs of electrodes, and a second power supply means having at least one power supply for applying a voltage to each electrode. As a result, the potential difference between the electrodes can be made substantially uniform, and the generation of negative glow in the bulb can be made uniform.
As a result, there is an effect that the color rendering of the discharge lamp can be enhanced.

According to a fourth aspect of the present invention, among the end portions of the second electrode where the negative glow uniform generation means is at both poles, the pair of end portions having a larger distance between the end portions of the two electrodes is the second power supply means. Since it is connected to both terminals, the potential difference between the electrodes can be made substantially uniform, and the generation of negative glow in the bulb can be made uniform. As a result, there is an effect that the color rendering of the discharge lamp can be enhanced.

According to the invention of claim 5, the negative glow uniform generating means connects one pole of the plurality of pairs of second electrodes by mutually inserting impedances, and the other pole is common to the first electrode. , The potential difference between the electrodes is made inversely proportional to the distance between the electrodes, and the intensity of the discharge generated between the first electrode and the second electrode is made substantially uniform, so that the generation of the negative glow in the bulb is made uniform. can do. As a result, there is an effect that the color rendering of the discharge lamp can be enhanced.

According to a sixth aspect of the present invention, the negative glow uniform generation means makes one pole of the second electrode common to one pole of the first electrode and the distance between the other pole of the second electrode and the common pole. Since the width of the second electrode is expanded in proportion to, the decrease in discharge due to the widening of the distance between the electrodes is compensated by expanding the width of the electrode to make the occurrence of negative glow in the valve uniform. can do. As a result, there is an effect that the color rendering of the discharge lamp can be enhanced.

According to a seventh aspect of the present invention, a plurality of second electrodes are arranged so that the negative glow uniform generating means are arranged so as to be adjacent to each other with the surface including the center line of the bulb interposed therebetween, and the adjacent second electrode. Since it comprises the second power supply means for applying a voltage between the electrodes and the switching means for sequentially switching the second electrode for applying the voltage, the position where the negative glow is generated in the valve is temporally changed so that the inside of the valve is changed. The generation of negative glow can be made uniform. As a result, there is an effect that the color rendering of the discharge lamp can be enhanced.

According to an eighth aspect of the present invention, the coil is disposed in the vicinity of the first electrode so that the coil is axially directed to the portion of the first electrode where the negative glow occurs, and the power supply means for supplying the exciting current is connected to the coil. Therefore, the negative glow generated in the vicinity of the cathode of the first electrode can be diffused by the magnetic field generated in the coil. As a result, it is possible to prevent the occurrence of color unevenness in the bulb by suppressing the light emission of the light emitting gas in the negative glow generated between the first electrodes, and to enhance the color rendering properties of the discharge lamp. There is.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram illustrating a first embodiment.

FIG. 2 is a schematic configuration diagram showing a second embodiment.

FIG. 3 is a schematic configuration diagram showing a third embodiment.

FIG. 4 is a schematic configuration diagram showing another configuration of the third embodiment.

FIG. 5 is a schematic configuration diagram showing a fourth embodiment.

6A and 6B show Example 5, in which FIG. 6A is a transverse cross-sectional view, and FIG. 6B is a schematic configuration diagram corresponding to a cross section taken along line XX of FIG. 6A.

FIG. 7 is a schematic configuration diagram showing a sixth embodiment.

FIG. 8 is a schematic configuration diagram showing a conventional example.

FIG. 9 is a schematic configuration diagram showing another conventional example.

FIG. 10 is a schematic configuration diagram showing still another conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 bulb 2 fluorescent layer 3a, 3b 1st electrode 4a, 4b 2nd electrode 5a, 5b, 5c high frequency power supply 6 light emission control part 7 lighting circuit

Claims (8)

[Claims] 1. At least a pair of discharge first electrodes are provided at a distance sufficiently longer than a negative glow generated by discharge between the electrodes, and at least a pair of discharge second electrodes.
Are separated from each other by a distance sufficiently shorter than the distance between the first electrodes, a fluorescent substance is built in, and is mainly ionized and excited by the discharge between the first electrodes to be converted into visible light by the fluorescent substance. Which emits visible light having a wavelength different from the visible light emitted from the fluorescent substance by being ionized / excited in the first glow gas that emits light and mainly in the negative glow generated by the discharge between the second electrodes. A discharge lamp having a bulb filled with a second light emitting gas, first and second power supply means for applying a voltage to the first and second electrodes, respectively, and an amount of visible light emitted by the fluorescent material and A variable color discharge lamp device comprising: a color adjusting means capable of adjusting the amount of visible light generated in the negative glow; and a negative glow uniform generating means for causing the negative glow to be substantially uniform in the bulb. . 2. The second electrode is formed by attaching a thin film conductor to the outer peripheral wall of the bulb.
The variable color discharge lamp device described. 3. The negative glow uniform generation means comprises a second electrode formed of a plurality of pairs of electrodes, and a second power supply means having at least one power supply for applying a voltage to each electrode. The variable color discharge lamp device according to claim 1 or 2. 4. The negative glow uniform generating means is characterized in that, among the end portions of both poles of the second electrode, a pair of end portions having a larger distance between the end portions of the two poles is connected to both terminals of the second power supply means. The variable color discharge lamp device according to claim 1 or 2, wherein the variable color discharge lamp device is connected. 5. The negative glow uniform generating means comprises a plurality of second pairs.
4. The variable color discharge lamp device according to claim 3, wherein one pole of the electrode is connected to each other by inserting impedance into each other, and the other pole is common to the first electrode. 6. The uniform negative glow generating means sets one pole of the second electrode in common with one pole of the first electrode in proportion to the distance between the other pole of the second electrode and the common pole. The variable color discharge lamp device according to claim 2, wherein the width of the second electrode is expanded. 7. The negative glow uniform generating means comprises a plurality of second electrodes which are arranged so as to be adjacent to each other with a surface including a center line of the bulb interposed therebetween, and a voltage between the adjacent second electrodes. 3. The variable color discharge lamp device according to claim 1, further comprising a second power supply means for applying a voltage and a switching means for sequentially switching a second electrode for applying a voltage. 8. A coil is disposed in the vicinity of the first electrode so that an axial direction is directed to a portion of the first electrode where negative glow occurs, and a power supply means for supplying an exciting current is connected to the coil. The variable color discharge lamp device according to claim 1.