JPH0896762A - Lighting system - Google Patents

Abstract

PURPOSE: To make emission capable rich in a sense of the season by controlling two by two lighted in accordance with the season, in a fluorescent lamp having three positive columns applying a respectively different phosphor to a tube surface. CONSTITUTION: Positive columnar parts 11, 12, 13, applying a respectively different phosphor to a tube surface, are connected by connecting parts 31, 32 in an opposite side to electrodes 21, 22, 23. A lighting device 10, in accordance with the season detected by a season sensor or timer, performs lighting by selectively switching a discharge wiring connected to the electrodes 21, 22, discharge wiring connected to the electrodes 22, 23 and a discharge wiring connected to the electrodes 21, 23. In this way, in accordance with the season, three kinds of different colors of light rich in a sense of the season are obtained by a single lamp.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device mainly used for indoor lighting.

[0002]

2. Description of the Related Art Power saving of electric products has been promoted in various fields. As a light source for illumination, compact fluorescent lamps, which are more efficient than incandescent bulbs, have come to be used in applications such as downlights where incandescent bulbs have been conventionally used.

FIG. 12 shows a conventional compact fluorescent lamp. In the figure, 11 is the first positive column part, 12 is the second positive column part, 21 is the first electrode, 22 is the second electrode, and 3
Reference numeral 1 is a joining portion, and 6 is a lighting device. In FIG. 12, the first positive column portion 11 and the second positive column portion 12 are made of glass tubes having the same length in the tube axis direction, and mercury is enclosed in the tubes. The positive pillar portions 11 and 12 are
The first electrode 21 and the second electrode 22 are provided on one side of each, and the side having no electrode is joined by the joining portion 31. The lighting device 6 is connected to the first electrode 21 and the second electrode 22. In the fluorescent lamp configured as described above, the discharge is performed in the route of the first electrode 21, the first positive column portion 11, the joint portion 31, the second positive column portion 12 and the second electrode 22. Compared with a fluorescent lamp having electrodes on both ends of the positive column, the positive column is joined and lengthened, so that the fluorescent lamp can be made highly efficient.

[0004]

There is a demand for light sources having different light colors even in the same light environment depending on the application. For example, a light source with a correlated color temperature of 5000K is suitable for producing a spring or summer season or a refreshing feeling in a living room, and a light with a correlated color temperature of 3000K for producing a fall or winter season or a calm feeling. Is suitable. In order to obtain different light colors with the conventional compact fluorescent lamp, it is necessary to replace the lamp, which is troublesome.

The present invention solves the above problems, and an object thereof is to provide an illuminating device which realizes different light colors with a single lamp depending on the season.

[0006]

In order to achieve the above-mentioned object, the present invention has three positive column portions each having an electrode on one end side, and the other end side having no electrode is joined at the positive column portion. Then, between the fluorescent lamp in which different phosphors are applied to the inner surface of the tube of each positive column part, and the first electrode in the first positive column part and the second electrode in the second positive column part. Discharge (path A discharge), discharge between the second electrode and the third electrode on the third positive column part (path B discharge), and
Of the discharge between the electrodes of the first electrode and the first electrode (C path discharge),
It has a means for switching at least two discharge paths and a seasonal sensor or timer for detecting the season, and is configured to switch between the A path discharge and the B path discharge according to the detected season.

[0007]

According to the present invention, according to the above structure, the A-path discharge and the B-path discharge are switched according to the detected season, and different phosphors are applied to the inner surface of the tube of each positive column. , A luminescence with a rich sense of the season is realized.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the structure of a lighting device according to an embodiment of the present invention.

In FIG. 1, 10 is a lighting device for controlling the lighting of a fluorescent lamp. 11 is the first positive column part, 1
2 is the second positive pillar portion, 13 is the third positive pillar portion, 21
Is a first electrode, 22 is a second electrode, 23 is a third electrode,
Reference numeral 31 is a joint portion a and 32 is a joint portion b, and the above-mentioned members form a fluorescent lamp.

The positive column parts 11, 12 and 13 are made of glass tubes as in the conventional example, and mercury is sealed therein. The joint part a31 connects the first positive column part 11 and the second positive column part 12, and the electrodes 2 of the respective positive column parts are connected to each other.
On the side without 1 and 22. The joint b32 is the second
The positive column portion 12 and the third positive column portion 13 are connected to each other, and the positive column portion 12 is on the side not having the electrodes 22 and 23. Different phosphors are applied to the tube surface of each positive column.

For the sake of explanation, the chromaticity point of emission is i (xi, y) on the tube surface of the first positive column in the xy chromaticity coordinates.
j) is applied, and a phosphor β whose emission chromaticity point is j (xj, yj) is applied to the tube surface of the second positive column part, and the tube of the third positive column part is applied. The chromaticity point of light emission on the surface is k (x
It is assumed that the fluorescent substance γ which is k, yk) is applied.

With respect to the illumination device having the above-mentioned structure,
When the lighting device 10 is connected to the first electrode 21 and the second electrode 22, the discharge path is as follows: first electrode 21-first positive column portion 11-junction 31-second positive column portion 12 -Second
Is performed in the path of the electrode 22 of (No. A discharge below).
The emitted light in this A-path discharge is the first positive column portion 1
Is a mixture of light emitted from the first and second positive column portions 12,
The chromaticity point is the midpoint of the line segment ij ((xi + xj) / 2,
(Yi + yj) / 2). The discharge path when the lighting device 10 is connected to the second electrode 22 and the third electrode 23 is as follows: second electrode 22-second positive column portion 12-junction b
32-the third positive column portion 13-the third electrode 23 (hereinafter, B-path discharge).

The radiated light in this B-path discharge is a mixture of light emitted from the second positive column portion 12 and the third positive column portion 13, and its chromaticity point is the midpoint of the line segment jk ((xj + x
k) / 2, (yj + yk) / 2). Lighting device 10
Is connected to the third electrode 23 and the first electrode 21, the discharge path is the third electrode 23-the third positive column portion 13-
Joint part b32-joint part a31-first positive column portion 11-
It is performed in the path of the first electrode 21 (hereinafter, C path discharge).

The radiated light in this C-path discharge is a mixture of light emitted from the third positive column portion 13 and the first positive column portion 11, and its chromaticity point is the midpoint of the line segment ki ((xk + x
i) / 2, (yk + yi) / 2). If the lengths of the joints 11 and 12 are sufficiently shorter than the lengths of the positive column portions 7, 8 and 9 in the tube axis direction, any two combinations of electrodes can be connected to the same lighting device 10. However, there is no great difference in their electrical characteristics and luminous efficiency. In the configuration as shown in FIG. 1, the A-path discharge and the B-path discharge have exactly the same electrical characteristics, but the C-path discharge does not have the same electrical characteristics in a strict sense because it crosses the junctions 11 and 12. In order to obtain the same electrical characteristics, impedance correction may be performed by the lighting device 10 or the lamp body only when the C path discharge is performed.

FIG. 2 shows a second structural view of the fluorescent lamp portion of the lighting device in this embodiment. In FIG. 2, 37 is a joint. With the structure as shown in FIG. 2, the discharge path lengths between the arbitrary combinations of two electrodes become equal. Therefore, the A, B, and C path discharges all have the same impedance, and the same electrical characteristics can be obtained by using the lighting device 10 for any combination of electrodes.

FIG. 3 is a third structural view of the fluorescent lamp portion of the lighting device of this embodiment shown in FIG. In FIG. 3, reference numeral 38 denotes a joint, and the positive column portions have different shapes. Therefore, it is possible to obtain U-shaped light emission having different sizes depending on the A-path discharge and the B-path discharge. Even if the positive column portions having different lengths and shapes in the tube axis direction are formed in this manner, stable discharge can be achieved by performing impedance correction according to the combination of electrodes to be discharged in the lighting device 10 or the fluorescent lamp. be able to. Therefore, even if the discharge path is switched, the emission intensity of the positive column portion can be made the same.

By switching the discharge path of the fluorescent lamp configured as described above, it is possible to obtain emitted light of different light colors with one lamp.

Next, the lighting device 10 of this embodiment will be described. FIG. 4 shows a first circuit diagram of the lighting device. In FIG. 4, 40 is a DC power supply and 41 to 46 are power transistors. The power transistors 41 and 42, 43 and 44, 45 and 46 are connected in series, respectively. The base input signals of the power transistors 41 and 42 are x1 and x2, the base input signals of the power transistors 43 and 44 are y1 and y2, and the power transistors 45 and 46.
Let z1 and z2 be the base input signals of. Further, X, Y and Z are defined between the emitter and the collector in each set.

FIG. 5 shows a wiring state of the fluorescent lamp. Figure 5
, 51, 52, 53 are choke coils, 61,
Reference numerals 62 and 63 are capacitors. Capacitors 61, 62
And 63 all have a capacitance of C, in such a wiring, a capacitor group (61 to 6) between arbitrary electrodes is formed.
The combined capacity of 3) is 1.5C.

FIG. 6 shows a time chart of the base input signal when the fluorescent lamp thus connected is discharged through the A path. In FIG. 6, the base input signals z1 and z2 are zero. The sets of x1 and x2, and y1 and y2 are in opposite phase. x1 and y2, and x2 and y1 are in phase. When such a base input signal is input, the power transistors 41 and 42 and the power transistor 43
And 44 operate in antiphase, 41 and 44 operate in phase, and 42 and 43 operate in phase. Also, the power transistor 4
5 and 46 do not work. Therefore, the current from the DC power source flows from the power transistor 41 → X → Y → the power transistor 44, and the power transistor 43 → Y → X.
→ The power transistor 42 is alternately switched. That is, an alternating current flows between X and Y.

From FIG. 5, the AC current causes the X-choke coil 51-first electrode 21-capacitor group (61).
~ 63) -Choke coil 52-Second electrode 22-Y, and the electrodes 21 and 22 are preheated. In addition, choke coils 51 and 52 and a capacitor group (61 to 6
Since a resonance circuit is formed with 3), a high voltage is generated between the electrodes 21 and 22, and discharge is started between the electrodes 21 and 22. When the discharge is stable, the alternating current becomes
The X-choke coil 51-first electrode 21-first positive column portion 11-junction a31-second positive column portion 12-second electrode 22-choke coil 52-Y.

When discharging the B path, the base input signals x1 and x2 are set to zero, and y1 and y2 and z1 and z are set.
2 may have opposite phases, and y1 and z2, and y2 and z1 may have the same phase. In this case, the current during stable discharge is Y
-Choke coil 52-Second electrode 22-Second positive column part 12-Joint part b32-Third positive column part 13-Third
Electrode 23-choke coil 53-Z.

When the C-path discharge is performed, the base input signals y1 and y2 are set to zero, z1 and z2, and x1 and x.
2 may have opposite phases, and z1 and x2, and z2 and x1 may have the same phase. In this case, the current during stable discharge is Z
-Choke coil 53-Third electrode 23-Third positive column part 13-Joint part b32-Joint part a31-First positive column part 11-First electrode 21-Choke coil 51-X . When the fluorescent lamp having the configuration as shown in FIG. 1 is to be turned on with all the discharge paths having the same electrical characteristics, for example, only the choke coil 52 may have different impedances. In the lighting device configured as above, the discharge path of the fluorescent lamp can be switched by the base input signal.

The switching of the base input signal for determining the discharge path may be performed by using a switch, a relay, a logic circuit, or a sequencer or a microcomputer. FIG. 7 shows an example of the switching means. Figure 7
In the figure, 110 is a roller switch. P, Q
Is a terminal and has a pulse signal of opposite phase. The rotary switch 110 has six contacts, two terminals of which are connected to the terminal P, two terminals of which are connected to the terminal Q, and the other two are left floating. Output side is base input signal x1, x2, y
1, y2, z1, and z2. By rotating the rotary switch 110 configured in this way by 120 degrees, it is possible to switch between the A, B, and C path discharges.

FIG. 8 shows a second circuit diagram of a lighting device for driving three positive column portions at the same time. In FIG. 8, 71, 72, 73, 74, 75 and 76 are power transistors, 81, 82 and 83 are capacitors, and 91 and 9
2, 93 are choke coils, 111, 112, 113,
114 is a switch. Power transistors 71 to 7
6 base input signals are respectively denoted by l1, l2, m1, m
2, n1 and n2. s1, s2, t1, t2, u
1, u2 are lamp connection terminals. Although s2 and t2 are always the same potential, they are shown as separate terminals for the purpose of explanation of operation. The switches 113 and 114 are interlocked, and when either the switch 111 or 112 is on, the switches 113 and 114 are off.

FIG. 9 shows a wiring diagram. In FIG. 9, 10
Reference numerals 1, 102 and 103 are capacitors. When all the capacitors of this capacitor group (101 to 103) are C, the capacitor has a capacitance of 1.5C between arbitrary electrodes. One of the first electrodes 21 is connected to s1 and u2, and one of the second electrodes 22 is connected to s1 and u2.
2 and t2 (equal potential), and one of the third electrodes 23 is connected to t1 and u1.

With respect to the fluorescent lamp of FIG. 1 thus connected, the discharge between the first electrode 21 and the second electrode 22 turns on the switch 111, and the base input signals l1 and l2 are changed to x1 in FIG. And x2 can be controlled by using continuous pulse signals of opposite phase. That is, in FIG. 8, when the signal l1 is on and the signal l2 is off, the DC power supply 40 → the power transistor 71 → the capacitor 81.
→ Current flows through the path of choke coil 91 → s1 → s2, and the capacitor 81 is charged. When the signal l1 is off and the signal l2 is on, the discharge from the capacitor 81 causes the capacitor 81 → the power transistor 72 → s2 →
A current flows through the path of s1 → choke coil 91. From this, the base input signals 11 and 12 cause the terminal s
An alternating current will flow between 1 and s2.

From FIG. 9, the alternating current between the terminals s1 and s2 is s1-first electrode 21-capacitor group (101-101).
103) -flowing through the second electrode 22-s2, the electrodes 21 and 22 are preheated. Further, since the resonance circuit is formed by the choke coil 91 and the capacitor 101, a high voltage is generated between the electrode 21 and the electrode 22 and the electrode 21 and the electrode 22 are generated.
The discharge starts between and. When the discharge is stabilized, the AC current is s1-first electrode 21-first positive column portion 11-junction a31-second positive column portion 12-second electrode 22-.
It flows through the route of s2. When the frequency of the base input signal increases, the impedance of the choke coil 91, which is the current limiting element, increases, and the amount of current discharged decreases. That is,
Dimming is possible depending on the frequencies of the base input signals 11 and 12.

The dimming of the illumination light by the discharge between the second electrode 22 and the third electrode 23 is based on the same operation principle.
The switch 112 is turned on, and the base input signals m1 and m2
It can be controlled by the frequency of. With the lighting device configured as described above, it is possible to simultaneously emit light and dimming the three positive pillar portions. By causing the light emission by the A-path discharge and the B-path discharge to be performed at the same time, it is possible to obtain illumination light having a chromaticity intermediate between the light emission of only the A-path discharge and the light emission of only the B-path discharge as a mixed light thereof. However, since the emission spectrum of low-pressure mercury vapor changes due to dimming,
The spectral composition of the emitted light is different. Therefore, the above-mentioned light mixture is not always on the straight line connecting the chromaticity of only the A-path discharge and the chromaticity of only the B-path discharge on the chromaticity diagram, and the chromaticity of the A-path discharge only. And the chromaticity of the region surrounding the chromaticity of only the B-path discharge is obtained.

When the lighting device shown in FIG. 8 is used, there is more chance of discharging from the second electrode 22 than other electrodes. If it continues to be used as it is, the second electrode 22 will eventually cause emitter loss before the other electrodes. To prevent it
When it is not always necessary to mix the A-path discharge and the B-path discharge, the switches 111 and 112 are turned off and the switch 1 is turned on.
13 and 114 are turned on, and continuous pulse signals of opposite phase are used as the base input signals n1 and n2 so that the C path discharge is performed. By doing so, it is possible to emit light by C path discharge that does not involve the second electrode 22, and it is possible to suppress wear of the second electrode 22. The emitted light in this case is the midpoint ((xk +
xi) / 2, (yk + yi) / 2).

Next, the coating pattern of the phosphor will be described. For the sake of explanation, the midpoint ((xi + xj) / 2, (yi + yj) / 2) of the line segment ij on the xy chromaticity has a correlated color temperature of 5000K (0.33 to 0.37,
0.33 to 0.37), and the midpoint ((xj + xk) / 2, (yj + yk) / 2) of the line segment jk has a correlated color temperature of 3000K (0.40 to 0.44).
0.38 to 0.42) in the range of phosphor α,
β and γ are applied to the tube surfaces of the positive column portions 11, 12, and 13, respectively. The fluorescent lamp configured as described above is switched between the A path discharge and the B path discharge by using, for example, the lighting device of FIG.

In the illuminating device constructed as above, A
The path discharge produces radiant light having a correlated color temperature of 5000K, and the B path discharge produces radiant light having a correlated color temperature of 3000K. Therefore, it is possible to obtain illumination light of two kinds of light colors with one lamp, and it is possible to save the trouble of replacing the lamp.

Next, the arrangement of the positive column portion of this embodiment will be described. FIG. 10 is a cross-sectional view when the tube axis of the positive column portion is viewed in a direction perpendicular to the paper surface. Figure 10
In the above, I, J, and K are the tube axis centers of the respective positive column portions, and they are arranged so as to form a triangle with each of them as an apex. By arranging in this way, a compact structure can be obtained as a whole. In FIG. 10, the tube axis centers are illustrated as forming an equilateral triangle, but the lengths of the sides may be different. Further, the tube axes do not necessarily have to be parallel, and for example, the tube axes may be arranged in a fan shape from the electrode side.

When the fluorescent lamp constructed as described above is discharged only between one set of electrodes with the positive column portion being in the horizontal direction, the illuminance and the light distribution of the illumination light differ depending on the mounting angle. . FIG. 11 is a cross-sectional view of the positive column portion in the direction perpendicular to the tube axis, and FIG. 11A shows the case where JK is the lowest. At the time of A-path discharge, the light emission by the phosphor α and the light emission by the phosphor β are mixed, but the positive column portion 11
Since a part of the light emission of (1) is blocked by the tube surfaces of the positive column portions 12 and 13, the illumination light is dominated by the light emission of the phosphor β.
In addition, the lower left side of the paper has a higher luminous intensity than the lower right side. B
When route discharge is performed, a mixture of light emitted by the fluorescent substance β and light emitted by the fluorescent substance γ is obtained with a symmetrical light distribution. When the C-path discharge is performed, the light emission by the phosphor γ and the light emission by the phosphor α are mixed, but the illumination light is dominated by the light emission by the phosphor γ. In addition, the lower right side of the paper has higher luminous intensity than the lower left side. Similarly, when the IJ or KI is the lowest, the illuminance and the light distribution differ depending on the discharge route.

FIG. 11B shows the case where J is the lowest. In the A-path discharge, the light emission by the phosphor α and the phosphor β
Due to the mixed emission of light, the substantially uniform light mixture is on the lower left side and the fluorescent light β is the dominant illumination light on the lower right side. In the B-path discharge, the light emission by the phosphor β and the light emission by the phosphor γ are mixed, but the phosphor β is dominant on the lower left side, and the illumination light is almost uniform on the lower right side. In the C-path discharge, the light emitted by the phosphor γ and the light emitted by the phosphor α are mixed, but α is dominant on the lower left side and fluorescent light γ is dominant on the lower right side. Similarly, when I or K is the lowest,
Illuminance and light distribution differ depending on the discharge path. Figure 11
In any of the cases of (a) and (b), the same applies to the case where the lighting device of FIG. 8 independently dimmers the A path discharge and the B path discharge.

As described above, when the positive column portion is turned on in the horizontal direction as shown in FIG. 11, the illuminance and the light distribution are controlled by selecting the mounting angle and the positive column portion to emit light. be able to.

Next, a case will be described in which the A path discharge and the B path discharge are switched by a season sensor or a timer (not shown) for detecting the season. As a season sensor, means for measuring the outside air temperature may be provided, and the season may be estimated from the long-term fluctuation of the measured value.
It may be estimated from the solar altitude at a certain time. Alternatively, the season may be determined by a timer driven by an internal power supply. In the case of the above-mentioned coating pattern, based on the signal from the seasonal sensor or the timer, when it is determined that it is summer, it emits light at a correlated color temperature of 5000 K as B-path discharge, and when it is determined that it is winter, it correlates as A-path discharge. The base input signals x1, x2, y1, y2, z1, z2 in FIG. 6 are controlled so that the light is emitted at 3000K. With such a configuration, a light source having a refreshing light color in summer and a light color having warmth in winter can be realized by one type of fluorescent lamp.

Next, the difference (temperature or period) from the peak season of the adjacent season is calculated based on the output from the season sensor or the timer, and based on the difference, the light emission by the A path discharge and the B path It is to control light emission due to discharge.

For example, it is assumed that the season sensor is composed of an outside air temperature measuring device, and the average temperature during the day is 25 degrees Celsius or more in summer and 15 degrees Celsius or less in winter. When the measured value of the outside air temperature is 25 degrees Celsius or higher, it can be determined that it is summer, so only the switch 112 in FIG. 8 is turned on,
Illumination light having a correlated color temperature of 5000K is obtained by performing only the B-path discharge by the base input signals m1 and m2. When the measured value of the outside air temperature is 15 degrees Celsius or less, it can be determined that it is winter, so only the switch 111 in FIG. 8 is turned on, and only the A path discharge is performed by the base input signals 11 and 12 so that the correlated color temperature of 3000K is obtained. Get the illumination light.

When the measured value of the outside air temperature is 21 degrees Celsius, it is 4 degrees away from the summer threshold and 6 degrees away from the winter threshold. %, 40% for winter. Therefore, switch 1
11 and 112 are closed, and the A path discharge and the B path discharge are performed at the same time. The frequencies of the base input signals l1 and l2 and the frequencies of m1 and m2 are set so that the light quantity ratio of the light emission by the A path discharge and the light emission by the B path discharge is 4: 6, so that the illumination light suitable for the season can be obtained. it can.
Moreover, the light color of the illumination light can be gradually changed according to the change of seasons, and it is possible to prevent a sense of discomfort due to a sudden change. Although the control is performed according to the temperature difference, when the timer is used, the control may be performed according to the period difference.

Next, a case will be described in which a means for detecting a discharge path including an electrode having an emitter loss is provided to switch to a discharge path which does not involve an electrode having an emitter loss. In the case of emitter loss, discharge is less likely to occur, so that the current passes through the residual heat starting capacitor instead of the positive column part.

Now, it is assumed that in the lighting device of FIG. 4, emitter loss occurs due to A-path discharge. In FIG.
Normally, X-choke coil 51-first electrode 21
-First positive column part 11-Joint part a31-Second positive column part 12-Second electrode 22-Choke coil 52-Current flowing through Y is X-choke coil 51-First electrode 2
1-Capacitor group (61 to 63) -Second electrode 22-Choke coil 52-Y. Therefore, a resonance circuit is formed as at the time of starting, and the current is increased as compared with the case of normal discharge.

Therefore, in order to detect whether the emitter loss occurs in a certain discharge path, the power transistors 41 to 46 and the choke coil 5 involved in the discharge are detected.
By measuring the current flowing through 1 to 53, it is possible to know whether or not it is in the state of normal discharge. Further, since Joule heat is generated by the overcurrent, the temperature of the element in which the current related to the discharge flows may be measured.

When one electrode has an emitter loss, an overcurrent always flows in two discharge paths.
For example, when the first electrode 21 has an emitter loss, an abnormality is detected by the A path discharge and the C path discharge. By carrying out such measurement for all the discharge paths, the electrode having the emitter loss can be determined. Then, when the emitter loss is detected, the base input signals x1, x2, y1, y2, z1, z2 are switched so as to switch to the discharge path in which the electrode causing the loss is not involved. That is, when the cause is the first electrode 21, the B-path discharge is performed in which no abnormality is detected.

Also in the case of the lighting device of FIG. 8, the electrode causing the emitter loss can be determined by the same means. With the above configuration, the discharge path of the emitter loss can be avoided and used, the accident due to the temperature rise of the lighting circuit can be prevented, and the usable electrode can be automatically switched. Further, if one electrode causes an emitter loss, the positive column portion that emits light is limited. Therefore, the user can know the extent of the lamp life because the discharge path is not switched. In addition, since different phosphors are applied to the tube surface of the positive column portion, a specific emission color is obtained depending on the discharge path. Therefore, the user can know which electrode is not involved in the discharge, and the maintenance work becomes easy.

In this embodiment, the correlated color temperature is set to 5000.
Although K and 3000K have been described, the present invention is not limited to this, and other color temperatures may be used. Further, the color temperature is set lower in the winter than in the summer, but the color temperature may be set lower in the summer depending on the application.

[0047]

As described above, according to the present invention, it is possible to realize a lighting device with a rich sense of the season, which can obtain three different light colors with one lamp depending on the season.

[Brief description of drawings]

FIG. 1 is a first structural diagram of a fluorescent lamp of a lighting device according to an embodiment of the present invention.

FIG. 2 is a second structural diagram of the fluorescent lamp according to the present embodiment.

FIG. 3 is a third structural diagram of the fluorescent lamp according to the present embodiment.

FIG. 4 is a first circuit diagram of the lighting device according to the present embodiment.

FIG. 5 is a wiring diagram of a lighting device and a lamp according to this embodiment.

FIG. 6 is a timing chart of a base input signal for A-path discharge in the lighting device according to the present embodiment.

FIG. 7 is a diagram showing an example of switching a base input signal in the lighting device according to the present embodiment.

FIG. 8 is a second circuit diagram of the lighting device according to the present embodiment.

FIG. 9 is a wiring diagram for simultaneously performing A-path discharge and B-path discharge according to the present embodiment.

FIG. 10 is a cross-sectional view of the fluorescent lamp of the present embodiment taken along the direction perpendicular to the tube axis.

FIG. 11A is a sectional view of the positive column portion in the direction perpendicular to the tube axis showing an example of the discharge state of the present embodiment. FIG. 11B is another sectional view of the positive column portion in the direction perpendicular to the tube axis.

FIG. 12 is a structural diagram of a conventional compact fluorescent lamp.

[Description of Reference Signs] 10 lighting device 11 to 13 positive column portion 21 to 23 electrodes 31, 32 junction portion 41 to 46 power transistor 51 to 53 current control choke coil 61 to 63 residual heat starting capacitor 71 to 76 power transistor 81 to 83 Charge Storage Capacitors 91-93 Current Control Choke Coils 101-103 Remaining Heat Starting Capacitors 110 Rotary Switches 111-114 Switches

Claims (4)

[Claims] 1. A fluorescent column having three positive column parts each having an electrode on one end side thereof, and the other end side having no electrodes bonded to the positive column part, and different fluorescent light on the tube surface of each positive column part. A body-applied fluorescent lamp, a discharge between the first electrode in the first positive column portion and the second electrode in the second positive column portion (hereinafter referred to as A-path discharge), and the second Discharge between the electrode and the third electrode in the third positive column portion (hereinafter,
A B-channel discharge) and a discharge between the third electrode and the first electrode (hereinafter C-channel discharge), a means for switching at least two discharge paths, and a season sensor or timer for detecting the season. An illumination device which has the A-channel discharge and the B-channel discharge according to a detected season. 2. The fluorescent lamp is the first in terms of xy chromaticity.
The chromaticity point i (xi, yi) of the light emission from the positive column part of, and the chromaticity point j (xj, yj) of the light emission from the second positive column part of
For the chromaticity point k (xk, yk) from the third positive column portion, the midpoint of the line segment ij is the chromaticity region x = 0.33 to 0.3.
7, y = 0.33 to 0.37 and the midpoint of the line segment jk is the chromaticity region x = 0.40 to 0.44, y = 0.38 to
The lighting device according to claim 1, wherein the lighting device is at 0.42. 3. The illuminating device according to claim 1, wherein the positive column portion is arranged so as to form a polygon whose apex is the center of the tube axis. 4. A light emission due to A-path discharge and a light emission due to B-path discharge are controlled based on the difference between the peak season of the adjacent season calculated based on the output from the season sensor or the timer. The lighting device according to claim 1.