JPH0896761A - Lighting equipment - Google Patents

Abstract

(57) [Summary] [Purpose] To achieve different light colors with a single lamp. [Structure] The positive column portion 11 has three positive column portions 11, 12, 13 each having an electrode 21, 22, 23 on one end side, and the side without the electrode is joined to form the first positive column portion 11 Fluorescent lamps with different phosphors applied to the surface of the tube and phosphors applied to the surfaces of the second and third positive column portions 12 and 13 are controlled by the lighting device 10 according to the season to control the sense of the season. It emits rich light.

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 FIG. 12, 11 is the first positive column part,
Reference numeral 12 is a second positive column portion, 21 is a first electrode, 22 is a second electrode, 31 is a joint portion a, and 6 is a lighting device. Figure 1
In 2, 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. Sunlight column part 1
1 and 12 have the first electrode 21 and the second electrode 22 on one side, and the side not having the electrode has the bonding portion 3
They are joined by 1. The lighting device 6 includes the first electrode 21.
And the second electrode 22. In the fluorescent lamp configured as described above, the discharge is performed by the first electrode 21, the first positive column portion 11, the joint portion 31, and the second positive column portion 1.
2-Done in the path of 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 object, the present invention has three positive column portions each having an electrode on one end side thereof, and the other end side having no electrode is joined to each positive column portion. However, the fluorescent substance applied to the tube surface of the first positive column portion and the fluorescent substance applied to the tube faces of the second and third positive column portions are different fluorescent lamps, and the fluorescent lamps in the first positive column portion are different. Discharge between the first electrode and the second electrode on the second positive column (A path discharge), and discharge between the second electrode and the third electrode on the third positive column (B path) Discharge) and a discharge between the third electrode and the first electrode (C path discharge), a means for switching at least two discharge paths, and a seasonal sensor or timer for detecting the season, and an A path discharge. And B path discharge are switched according to the detected season.

[0007]

With the above structure, the positive column portion emitting light is changed depending on the season, and only the light emission by the discharge path involving the second and third positive column portions is changed by the other discharge path involving the first positive column portion. The light colors of emitted light and emitted light are different.

[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. On the tube surface of the first positive column portion, a fluorescent substance different from the tube surfaces of the second and third positive column portions is applied.

With respect to the illuminating device configured as described above,
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 part 11-joint part a31-second positive column part 12. -It is performed in the path of the second electrode 22 (hereinafter referred to as A path discharge). The emitted light in this A-path discharge is a mixture of light emitted from the first positive column portion 11 and the second positive column portion 12.

When the lighting device 10 is connected to the second electrode 22 and the third electrode 23, the discharge path is the second electrode 22.
-Second positive column portion 12-Joint part b32-Third positive column portion 13-Third electrode 23
It is called 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.

When the lighting device 10 is connected to the third electrode 23 and the first electrode 21, the discharge path is the third electrode 23.
-Third positive column part 13-Joint part b32-Joint part a31
-First positive column portion 11-It is performed in the path of the first electrode 21 (hereinafter, referred to as C path discharge). Joints 31 and 3
If the length of 2 is sufficiently shorter than the length of the positive column portions 11, 12, 13 in the tube axis direction, even if any two combinations of electrodes are connected to the same lighting device 10, the electric There is no big difference in the optical characteristics and the 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 31 and 32. In order to obtain the same electric characteristics, impedance correction may be performed in the lighting device 10 or the lamp main body only when the C path discharge is performed. In FIG. 1, the first positive column portion 11 to which a phosphor different from the others is applied is described as the left end on the paper surface, but it may be the center or the right end on the paper surface.

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 as described above, 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. You can Therefore, even if you switch the discharge path,
The emission intensity of the positive column part can be made the same.

The radiated light due to the A-path discharge is a mixture of light emitted from the first positive column part 11 and the second positive column part 12, and the radiated light due to the C-path discharge is the third positive column part 13 and the third positive column part 13. This is a mixture of light emitted from the positive column portion 11 of No. 1. First
Since only the phosphors coated on the tube surface of the positive column portion 11 are different, the emission colors of the A-path discharge and the C-path discharge are the same, and only the emission light of the B-path discharge is different.
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 the 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 timing chart of the base input signal when the fluorescent lamp connected as described above is discharged through the A path. In FIG. 6, the base input signal z1,
z2 is 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, the power transistors 43 and 44 operate in opposite phase, 41 and 44 in phase, and 42 and 43 in phase. Further, the power transistors 45 and 46 do not operate. Therefore, the current from the DC power supply flows from the power transistor 41 → X → Y → power transistor 44 to the power transistor 4
Switching is performed in the order of 3 → Y → X → power transistor 42. 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.

In the case of B-path discharge, the base input signals x1 and x2 may be zero, y1 and y2 may be in antiphase, y1 and z2 may be in antiphase, and y1 and z2 may be inphase. In this case, the current at the time of stable discharge is as follows: Y-choke coil 52-second electrode 22-second positive column portion 12
-Joint part b32-Third positive column part 13-Third electrode 2
3- Flow through the path of choke coil 53-Z.

When the C path discharge is performed, the base input signals y1 and y2 are set to zero, and z1 and z2, and x1 and x are set.
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.

In 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,
DC power supply 40 → power transistor 71 → capacitor 8
A current flows through the path of 1 → 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.
→ s1 → current flows through the path of choke coil 91. From this, the base input signals l1 and l2 cause an alternating current to flow between the terminals s1 and s2.

From FIG. 9, the alternating current between terminals s1 and s2 is s1-first electrode 21-capacitor group (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, the electrode 21
A high voltage is generated between the electrode 21 and the electrode 22,
The discharge starts between the two. When the discharge is stabilized, the AC current is s1-the first electrode 21-the first positive column portion 11-.
Junction part a31-second positive column portion 12-second electrode 22
-S2 flow. 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 cause the three positive column portions to emit light and perform dimming. 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 this,
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.

Next, the case of switching between the A path discharge and the B path discharge will be described. For example, as the base input signal in FIG. 4, a pair in which x1, x2, y1, y2 are pulse signals and z1, z2 are zero, and y1, y2, z
1 and z2 are switched between a pulse signal and a set in which x1 and x2 are zero. This switching can be realized by providing a stopper so that the rotary switch 110 can move only for one step, for example. With this configuration, it is possible to switch between the A path discharge in which the first positive column portion is involved and the B path discharge in which the first positive column portion is not involved. Therefore, it is possible to obtain illumination light of different light colors with one fluorescent lamp.

A switch, a relay, a logic circuit, or a sequencer or a microcomputer may be used as the discharge path switching means, and the means is not limited.

Further, the case of switching between the A path discharge and the C path discharge will be described. For example, as the base input signal in FIG. 4, a set in which x1, x2, y1, y2 are pulse signals and z1, z2 are zero, and z1, z2, x
1 and x2 are switched to a pulse signal and a set in which y1 and y2 are zero. This switching can be realized by providing a stopper so that the rotary switch 110 can move only for one step, for example. With this configuration, the discharge path can be switched without changing the light color between the A path discharge and the C path discharge in which the first positive column portion is involved. By increasing the frequency of this switching, it is possible to maintain the wear of the second electrode 22 and the third electrode 23 at the same level, and it is effective in extending the life.

A switch, a relay or a logic circuit may be used as the discharge path switching means, or a sequencer or a microcomputer may be used, and the means is not limited.

Next, the first coating pattern of the phosphor will be described. In the first coating pattern, the chromaticity range is x = 0.48 to 0.52 inside the tube surface of the first positive column part.
A fluorescent substance that emits light at y = 0.43 to 0.47 is applied, and the chromaticity range is x = 0.0.4 inside the tube surfaces of the second and third positive column portions.
A phosphor that emits light at 33 to 0.37 and y = 0.33 to 0.37 is applied. In the fluorescent lamp configured as described above, in the A-path discharge and the C-path discharge, since the light emission of the positive column portion 11 and the positive column portion 12 or the positive column portion 13 is mixed, the chromaticity of the illumination light is x = 0. 40-0.4
4, y = 0.38 to 0.42. That is,
The illumination light has a correlated color temperature of 3000K. In the B path discharge, since the positive column portion 12 and the positive column portion 13 emit light, the chromaticity of the illumination light is x = 0.33 to 0.37, y = 0.
33 to 0.37, and the correlated color temperature at this time is 500.
It is 0K. By controlling lighting with the lighting device of FIG. 4, the illumination light having a correlated color temperature of 3000 K and the correlated color temperature of 500
The illumination light of 0K can be obtained with one fluorescent lamp.

If the lighting device shown in FIG. 8 is applied to switch between the A-path discharge and the C-path discharge at the same time and the B-path discharge only, the correlated color temperature 30
The illuminance of the illumination light of 00K can be made larger than that of the illumination light of the correlated color temperature 5000K. This is effective when increasing the amount of light having a correlated color temperature of 3000 K suitable for winter, when performing phototherapy for eliminating the depressive symptoms seen in winter.

Next, the second coating pattern of the phosphor will be described. In the second coating pattern, the chromaticity range is x = 0.25 to 0.29 inside the tube surface of the first positive column portion,
A phosphor that emits light at y = 0.28 to 0.32 is applied, and the chromaticity range is x = 0.0.2 inside the tube surfaces of the second and third positive column portions.
A phosphor that emits light of 40 to 0.44 and y = 0.38 to 0.42 is applied. In the fluorescent lamp configured as described above, in the A-path discharge and the C-path discharge, since the light emission of the positive column portion 11 and the positive column portion 12 or the positive column portion 13 is mixed, the chromaticity of the illumination light is x = 0. .33-0.3
7, y = 0.33 to 0.37. That is,
The illumination light has a correlated color temperature of 5000K. In the B path discharge, since the positive column portion 12 and the positive column portion 13 emit light, the chromaticity of the illumination light is x = 0.40 to 0.44, y = 0.
38 to 0.42, and the correlated color temperature at this time is 300
It is 0K. By controlling lighting with the lighting device of FIG. 4, the illumination light having a correlated color temperature of 3000 K and the correlated color temperature of 500
The illumination light of 0K can be obtained with one fluorescent lamp.

When the lighting device shown in FIG. 8 is applied to switch between the A path discharge and the C path discharge at the same time and the B path discharge only, the correlated color temperature 50
The illuminance of the illumination light of 00K can be made larger than that of the illumination light of the correlated color temperature 3000K. For example, when the light environment is changed from a refreshing active atmosphere to a calm atmosphere under illumination light with a correlated color temperature of 5000K, the illuminance can be reduced at the same time, and the effect of light production can be enhanced.

Next, the arrangement of the positive column portion in the fluorescent lamp of FIG. 1 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. In FIG. 10, I, J, and K are the tube axis centers of the respective positive column portions, and 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 with the positive column portion in the horizontal direction, the illuminance and the light distribution of the illumination light differ depending on the mounting angle.
FIG. 11 is a sectional view of the positive column portion in the direction perpendicular to the tube axis. In the following description, it is assumed that the fluorescent lamp of the first coating pattern discharges only between one set of electrodes.

FIG. 11A shows the case where JK is the lowest. During the A-path discharge and the C-path discharge, part of the light emitted from the positive column portion 11 is blocked by the tube surfaces of the positive column portions 12 and 13, so that the illumination light has a correlated color temperature lower than 5000K. In addition, the lower left side has higher luminous intensity than the lower right side. In the case of B-path discharge, the illumination light has a correlated color temperature of 5000 K and the luminosity is symmetrical. 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 correlated color temperature is 3000 on the lower left side.
The illuminating light of K is the illuminating light having a correlated color temperature lower than 5000K on the lower right side. In the B-path discharge, the correlated color temperature is 50
At 00K, the lower left side has lower luminous intensity than the lower right side. In the C path discharge, the illumination light having a correlated color temperature lower than 3000K is obtained on the lower left side, and the illumination light having a correlated color temperature lower than 5000K is obtained on the lower right side. Similarly, when I or K is the lowest, the illuminance and the light distribution differ depending on the discharge route. In either case of FIG. 11 (a) and (b), the lighting device of FIG.
The same applies when the path discharge and the B path discharge are independently dimmed.

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. When the fluorescent lamp of the first application pattern is driven by the lighting device of FIG. 4, when it is determined that it is summer based on the signal from the season sensor or the timer, it is caused to emit light at the correlated color temperature of 5000K as the B path discharge, and winter. When it is determined that the base input signal x1, x2, y of FIG.
1, y2, z1, z2 are controlled.

When the fluorescent lamp of the second coating pattern is driven by the lighting device of FIG. 4, when it is determined that it is summer based on the signal from the season sensor or the timer, it emits light with a correlated color temperature of 5000K as A path discharge. When it is determined that it is winter, the base input signals x1, x2, y of FIG.
1, y2, z1, z2 are controlled. 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 difference or period) from the peak season of the adjacent season is calculated based on the output from the season sensor or the timer, and the light emission due to the A-path discharge and the B light are calculated based on the difference. Controlling the light emission due to the path discharge. For example, in a region where the seasonal sensor is composed of an outside air temperature measuring device and the average temperature during the daytime is 25 degrees Celsius or more in the summer and 15 degrees Celsius or less in the winter, the first application pattern by the lighting device of FIG. The case of driving the fluorescent lamp will be described.

When the measured value of the outside air temperature is 25 degrees Celsius or more, it can be determined that it is summer, so the switch 11 in FIG.
2 is turned on, and only the B path discharge is performed by the base input signals m1 and m2.
Obtain an illumination light of 00K. When the measured value of the outside air temperature is 15 degrees Celsius or less, it can be determined that it is winter. Therefore, only the switch 111 in FIG.
By performing only the A-path discharge in step 2, illumination light having a correlated color temperature of 3000 K is obtained. If the measured outside air temperature is 21 degrees Celsius, it is 4 degrees away from the summer threshold and 6 degrees away from the winter threshold. Suppose that 40% is needed. Therefore, the switches 111 and 112 are closed so that the A-path discharge and the B-path discharge are simultaneously performed. 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. In the case of a timer, control may be performed according to the difference in time period.

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 the 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, in the lighting device of FIG.
It is assumed that emitter loss occurs due to path discharge.

In FIG. 4, normally, the X-choke coil 51-first electrode 21-first positive column portion 11-
Junction part a31-second positive column portion 12-second electrode 22
-The current flowing through the choke coil 52-Y is X-choke coil 51-first electrode 21-capacitor group (61-61).
63) -flowing through the second electrode 22-the choke coil 52-Y. Therefore, the resonance circuit is formed in the same way as when starting,
The current is higher than in a normal discharge. Therefore,
In order to detect whether the emitter loss occurs in a certain discharge path, the power transistor 4 involved in the discharge is detected.
By measuring the currents flowing through 1 to 46 and the choke coils 51 to 53, it is possible to know whether or not the discharge is in a normal state.

Since Joule heat is generated due to overcurrent, the temperature of the element through which the current related to 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 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.

[0052]

As described above, according to the present invention, it is possible to realize a lighting device that obtains 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.

[Explanation of symbols]

 10 Lighting device 11-13 Positive column part 21-23 Electrode 31,32 Junction part 41-46 Power transistor 51-53 Current control choke coil 61-63 Remaining heat starting capacitor 71-76 Power transistor 81-83 Charge storage capacitor 91-93 Current control choke coil 101-103 Remaining heat starting capacitor 110 Rotary switch 111-114 switch

Claims (5)

[Claims] 1. A positive column part having three electrodes on one end side, and the other end side having no electrode on each positive column part is joined and applied to the tube surface of the first positive column part. A fluorescent lamp in which the phosphor is different from the phosphors applied to the tube surfaces of the second and third positive column parts, a first electrode in the first positive column part, and a second electrode in the second positive column part. Discharge between the electrodes (below,
A path discharge), discharge between the second electrode and the third electrode in the third positive column portion (hereinafter referred to as B path discharge), and discharge between the third electrode and the first electrode. (Hereinafter, referred to as “C path discharge”), a means for switching at least two discharge paths, and a seasonal sensor or timer for detecting a season, and the switching between the A path discharge and the B path discharge is detected. A lighting device characterized by being performed according to the season. 2. A phosphor that emits light in a chromaticity range of x = 0.48 to 0.52 and y = 0.43 to 0.47 is applied to the inside of the tube surface of the first positive column portion, The chromaticity range is x = 0.33 to 0.37, y = 0.3 inside the tube surface of the second and third positive columns.
The lighting device according to claim 1, wherein a phosphor that emits light of 3 to 0.37 is applied. 3. A phosphor that emits light with a chromaticity range of x = 0.25 to 0.29 and y = 0.28 to 0.32 is applied to the inside of the tube surface of the first positive column portion, The chromaticity range is x = 0.40 to 0.44, y = 0.3 inside the tube surface of the second and third positive columns.
The lighting device according to claim 1, wherein a phosphor that emits light of 8 to 0.42 is applied. 4. The positive column portions are arranged so as to form a polygon with the center of the tube axis as an apex.
Illumination device described. 5. The difference between the peak season of the adjacent season is calculated based on the output from the season sensor or the timer, and the light emission by the A path discharge and the light emission by the B path discharge are controlled based on the difference. The lighting device according to claim 1, wherein: