JPH0896760A - Lighting equipment - Google Patents

Abstract

(57) [Abstract] [Purpose] A lighting device having four or more positive columns having independent electrodes, and a fluorescent lamp having at least one tube surface coated with a different phosphor from the other, depending on the season. ,
To provide a lighting device that realizes different light colors with one lamp. [Structure] Having four or more positive column portions 11 to 14 each having electrodes 21 to 24 at one end side, and joining the other end side having no electrodes at the positive column portion, at least one of the positive column portions is joined. A fluorescent lamp whose fluorescent material applied to the surface of the tube is different from the fluorescent material applied to the other surface of the tube is controlled by the lighting device 10 according to the season to emit light with a rich seasonal feeling.

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. 14 shows a conventional compact fluorescent lamp. In the figure, 11 is the first positive column portion and 12 is the second
Positive column portion, 21 is the first electrode, 22 is the second electrode,
Reference numeral 31 is a joining portion a, and 6 is a lighting device. In FIG. 14, the first positive column portion 11 and the second positive column portion 12 are shown.
Is composed of a glass tube having an equal length in the tube axis direction, and mercury is enclosed in the tube. Each of the positive column portions 11 and 12 has a first electrode 21 and a second electrode 22 on one side thereof, and the side having no electrodes is joined by a 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 by the first electrode 21, the first positive column portion 11, the joint portion a31, and the second positive column portion 12.
-On 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]

However, even in the same light environment, there are demands for light sources having different light colors 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 conventional compact fluorescent lamps, the lamps must be replaced,
It was 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 four or more positive column portions each having an electrode on one end side thereof, and the other end side having no electrode is joined to the positive column portion. A fluorescent lamp in which the phosphor coated on at least one tube surface of the positive column portion is different from the phosphor coated on the other tube surface, and means for switching the discharge path between any two electrodes. A seasonal sensor or a timer for detecting the season is provided, and the emission color of the emitted light is controlled so that the correlated color temperature of the emission color is changed depending on the detected season.

[0007]

In the above construction, by switching the discharge path, the light color of the light radiated by the electrodes involved is different, so that the light color of the illuminating light can be switched among various kinds according to the season.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing 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, 12
Is a second positive column part, 13 is a third positive column part, 14 is a fourth positive column part, 21 is a first electrode, 22 is a second electrode, 23 is a third electrode, and 24 is a second electrode. The reference numeral 4 denotes an electrode, 31 denotes a joint portion a, 32 denotes a joint portion b, 33 denotes a joint portion c, and the above constituent members constitute the fluorescent lamp of the first structure.

The positive column portions 11, 12, 13, 14 are made of glass tubes as in the conventional example, and mercury is sealed therein. The joint portion a31 connects the first positive column portion 11 and the second positive column portion 12 and is on the side of the respective positive column portions where the electrodes 21 and 22 are not provided. The joint b32 is
The second positive column portion 12 and the third positive column portion 13 are connected to each other, and the electrodes 22 and 23 of the respective positive column portions are connected.
On the side that does not have. The joint portion c33 connects the third positive column portion 13 and the fourth positive column portion 14 and is on the side of the respective positive column portions where the electrodes 23 and 24 are not provided.

The illuminating device configured as described above is capable of discharging between arbitrary electrodes. For example, the first electrode 2
The discharge between the first electrode 21 and the second electrode 22 is
The first positive column portion 11-junction a31-second positive column portion 12-second electrode 22 is used.

The phosphor α is applied to the tube surface of the first positive column portion 11, and the second positive column portion 12 and the third positive column portion 13 are applied.
And when different phosphors β are applied to the tube surface of the fourth positive column portion 14, in the discharge path involving the first electrode 21,
This is a mixture of light emitted by the fluorescent substance α and the fluorescent substance β. Further, in the discharge path in which the first electrode 21 is not involved, light emission due to the phosphor β is mixed. That is, it is possible to provide illumination light of two colors with one lamp.

The phosphors α are applied to the tube surfaces of the first positive column portion 11 and the second positive column portion 12, and the third positive column portion 1 is coated.
The discharge path and the emission color of the case where different phosphors β are applied to the tube surfaces of the third and fourth positive column portions 14 will be described. The discharge between the first electrode and the second electrode causes the phosphor α to emit light. The discharge between the third electrode and the fourth electrode causes the phosphor β to emit light. Between the first electrode and the third electrode, between the first electrode and the fourth electrode, between the second electrode and the third electrode, and between the second electrode and the fourth electrode.
Due to the discharge between the electrodes, the light emission of the phosphor α and the phosphor β is mixed. That is, it is possible to provide illumination light of three different colors with one lamp.

Further, when three kinds of different phosphors are used, four different colors of illumination light can be obtained, and when four kinds of different phosphors are used (coating on the tube surface of all positive column parts). In the case of different phosphors), it is possible to obtain illumination light of 6 different colors.

In the fluorescent lamp shown in FIG. 1, the impedance varies depending on the discharge path. In order to provide stable lighting for all discharge paths, for example, the lighting device 10
The impedance may be corrected on the side.

FIG. 2 shows a second example of the fluorescent lamp in this embodiment.
Shows the structure of. In FIG. 2, 39 is a joint. In the lamp having the shape shown in FIG. 2, impedances between arbitrary electrodes are equal, and correction on the lighting device 10 side is not necessary.

FIG. 3 shows a third example of the fluorescent lamp in this embodiment.
Shows the structure of. The shape of the positive column is different. Depending on the discharge path, it is possible to obtain a U-shaped light emitting portion having a different size and shape. 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 the discharge path is switched, the emission intensity of the positive column portion can be made the same.

Although the case where the number of positive columns is four has been described above, the same effect can be obtained when the number of positive columns is four or more. FIG. 4 shows a fourth structural diagram of the present embodiment in the case where there are five positive columns. In FIG. 4, 15 is the fifth positive column portion, and 2 is
Reference numeral 5 is a fifth electrode, and 34 is a joint portion 34. By using the fluorescent lamp having such a structure, it is possible to provide illumination light of up to 10 different colors with one lamp.

Next, a lighting device for controlling the lighting of the fluorescent lamp will be described. Hereinafter, the principle of the inverter type lighting device will be described with reference to FIG. 5 in the case of a fluorescent lamp having four positive column portions.

In FIG. 5, reference numeral 40 denotes a DC power source, 41,
42, 43, 44, 45, 46, 47, 48 are power transistors. Power transistors 41 and 42,
43 and 44, 45 and 46, 47 and 48 are connected in series. The base input signals of the power transistors 41 and 42 are w1 and w2, and the power transistors 43 and 44 are
, X1 and x2, the base input signals of the power transistors 45 and 46 are y1 and y2, and the base input signals of the power transistors 47 and 48 are z1 and z2. Further, W, X, Y and Z are set between the emitter and the collector in each set.

FIG. 6 shows the wiring of the fluorescent lamp of this embodiment. In FIG. 6, 51, 52, 53 and 54 are choke coils, and 61, 62, 63, 64, 65 and 66 are capacitors. When the capacitors 61 to 66 all have a capacitance of C, the combined capacitance of the capacitors (61 to 66) between arbitrary electrodes in such a wiring is 2C. Regarding the fluorescent lamps connected as described above, the second
FIG. 7 shows a timing chart of the base input signal in the case of discharging between the electrode 22 and the third electrode 23 of FIG.

In FIG. 7, base input signals w1 and w
2, z1 and z2 are zero. x1 and x2, and y1
And y2 have opposite phases. x1 and y2, and x2 and y1 are in phase. When such a base input signal is input, the power transistors 43 and 44 and the power transistors 45 and 46 operate in opposite phases, 43 and 46 in phase, and 44 and 45 in phase.

Further, the power transistors 41, 42, 4
7 and 48 do not work. Therefore, the current from the DC power source flows from the power transistor 43 → X → Y → the power transistor 46 and the power transistor 45 → Y → X.
→ The power transistor 44 is alternately switched. That is, an alternating current flows between X and Y.

From FIG. 6, the AC current causes the X-choke coil 52-second electrode 22-capacitor group (61).
˜66) -Third electrode 23-Choke coil 53-Y, and the electrodes 22 and 23 are preheated. Also, the choke coils 52 and 53 and the capacitor group (61 to 6
Since a resonance circuit is formed with 6), a high voltage is generated between the electrode 52 and the electrode 53, and the discharge starts between the electrode 52 and the electrode 53.

When the discharge is stabilized, an alternating current is generated by the X-choke coil 52-second electrode 22-second positive column portion 1.
2-junction b12-third positive column portion 13-third electrode 23-choke coil 53-Y. Other discharge paths can be turned on in the same manner. In that case, when the fluorescent lamp having the structure as shown in FIG. 1 is turned on with uniform electric characteristics for all discharge paths, the impedance of the choke coils 51 to 54 may be adjusted, for example.

In the lighting device thus constructed, the discharge path of the fluorescent lamp can be switched by the base input signal. This switching may be performed by using a rotary switch or a sliding type switch, a relay or a logic circuit, or a sequencer or a microcomputer. When the frequency of the base input signal is changed, the impedance of the choke coils 51 to 54 changes and the amount of current flowing through the discharge path also changes. Therefore, by adjusting the frequency of the base input signal, the dimming of the positive column portion that is discharging can be performed.

FIG. 8 shows the second principle of the inverter type lighting device. In FIG. 8, three or more positive column portions are simultaneously driven. Of the five fluorescent lamps having the positive column part shown in FIG. 4, the second to fourth positive column parts 1 will be described below.
A case where 2 to 14 are caused to emit light will be described.

In FIG. 8, 71, 72, 73 and 74 are power transistors, 81 and 82 are capacitors, 91,
92 is a choke coil. Power transistor 71
To 74 base input signals, l1, l2, m
1 and m2. s1, s2, t1 and t2 are lamp connection terminals, respectively. Although s2 and t2 are always the same potential, they are shown as separate terminals for the purpose of explanation of operation.

FIG. 9 shows a wiring diagram. In FIG. 9, 10
Reference numerals 1 and 102 are capacitors. One of the second electrodes 22 is connected to s1 and one of the third electrodes 23 is connected to s2 and t2.
(The same potential), and one of the fourth electrodes 24 is connected to t1.

With respect to the fluorescent lamp of FIG. 4 connected in this way, the discharge between the second electrode 22 and the third electrode 23 becomes the base input signals l1 and l2 as shown by x1 and x2 in FIG. It can be controlled by a continuous pulse signal 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 → the choke coil 91 → s1.
→ Current flows through the path of s2, and the capacitor 81 is charged. When the signal l1 is off and the signal l2 is on, the capacitor 81 discharges a current through the path of capacitor 81 → power transistor 72 → s2 → s1 → choke coil 91. From this, the base input signal l
1 and 12 cause an alternating current to flow between the terminals s1 and s2.

From FIG. 9, the alternating current between the terminals s1 and s2 is s1-second electrode 22-capacitor 101-third.
Of the electrodes 23-s2, and the electrodes 22 and 23 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 electrodes 22 and 23, and the discharge starts between the electrodes 22 and 23. When the discharge is stable, the alternating current is s1-second
Electrode 22-second positive column portion 12-junction b12-third positive column portion 13-third electrode 23-s2. As the frequency of the base input signal increases, the impedance of the choke coil 91, which is a current limiting element, increases,
The amount of current to be discharged is reduced. That is, the base input signal l
Dimming is possible with frequencies of 1 and 12.

The dimming of the illumination light by the discharge between the third electrode 23 and the fourth electrode 24 can be controlled by the frequencies of the base input signals m1 and m2 based on the same operation principle. Further, the dimming of the illumination light due to the discharge between the first electrode 21 and the fifth electrode 25 can be controlled by the frequencies of the base input signals n1 and n2. With the lighting device configured as described above, the three positive pillar portions can emit light. In addition, by adding a circuit module including the power transistor, the capacitor, and the choke coil in FIG. 8 in parallel, the negative electrode side of the DC power supply is connected to the third electrode 23.
It is possible to simultaneously perform discharge through another path. That is, it is possible to simultaneously emit light from three or more positive column portions to control light.

Next, the arrangement of the positive column portion of the fluorescent lamp will be described. FIG. 10 is a view showing the arrangement of the positive column parts when there are four positive column parts, and is a cross-sectional view when the tube axis of the positive column parts is viewed in a direction perpendicular to the paper surface. As shown in FIG. 10, A, B, C, and D are the tube axis centers of the respective positive column portions, and are arranged so as to form a quadrangle with each of them as an apex. By arranging in this way, since the light emitting portions of the fluorescent lamp, which can provide different illumination light with one lamp, are concentrated, the overall size can be made compact.

FIG. 11 shows a sectional view in the case of five positive column portions, and FIG. 12 shows a sectional view in the case of six positive column portions. However, in FIG. 12, 16 is a 6th positive pillar part, and 35 is a junction part e. If a positive column is arranged at the center of the polygon formed by the center of the tube axis, it will be more compact, but the light utilization efficiency will decrease.

For example, the polygon ABCDE in FIG.
When the 6th positive column part is placed in the center of the, the light emission from the 6th positive column part is reflected / absorbed by the tube surface of the positive column parts 11, 12, 13, 14, 15 surrounding it. Since it repeats, it cannot be used as illumination light. Therefore, the center of the tube axis is preferably arranged so as to form a polygon.

In FIG. 10, FIG. 11 and FIG. 12, the respective tube axis centers are shown as forming a regular polygon, but the sides may have different lengths. 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.

Next, regarding an embodiment in which a phosphor is applied to a positive column portion having both ends of a diagonal line as the tube axis center in a polygon formed by the tube axis center, the positive column portion shown in FIG. The fluorescent lamp of the book will be described.

In FIG. 10, the fluorescent substance α and the second positive column portion 1 are provided on the tube surfaces of the first positive column portion 11 and the third positive column portion 13 at the diagonal positions of the quadrangle formed by the center of the tube axis.
The phosphor β is applied to the tube surfaces of the second and fourth positive column portions 14. In the fluorescent lamp configured in this manner, since the positive column portions that emit different light colors are dispersed, when the electrodes are mounted upward with a downlight or the like and the discharge is made between the electrodes at diagonal positions, the same result is obtained. It has a luminescent color, and when you look up from the bottom, the luminescent part appears to be even.

A case where the positive column is turned on in the horizontal direction will be described with reference to FIG. FIG. 13 is a sectional view of the fluorescent lamp in a direction perpendicular to the tube axis. When the light is turned on in the direction as shown in FIG. 13, the illuminance, chromaticity, and light distribution of the illumination light differ depending on the combination of the phosphors to be applied, the positive column portion for emitting light, and the attachment angle of the fluorescent lamp. For example,
As shown in FIG. 13 (a), when the electrodes are lit sideways and one positive column part is arranged at the bottom, and the positive column parts 11 and 13 emit light, or the positive column parts 12 and 14 are emitted. When the light is emitted, the light is emitted by the fluorescent substance α or the fluorescent substance β.

On the other hand, when the positive column portions 11 and 12, the positive column portions 12 and 13, the positive column portions 13 and 14, or the positive column portions 14 and 11 are caused to emit light, the phosphor α and the phosphor β are used as illumination light. However, the chromaticity and light distribution are different. For example, when the positive column portions 11 and 12 are made to emit light, since the light emission of the positive column portion 11 is blocked by the tube surfaces of the other positive column portions 12 and 13 in the lower left side of the paper, the emission mainly by the phosphor β is caused. It is dominant, and since the positive column portion 12 is also blocked on the lower right side of the drawing, the light is almost evenly mixed. Similarly, the chromaticity and the light distribution differ depending on the combination of the positive column portions that emit light.

Next, as shown in FIG. 13B, the case where the two positive pillar portions are arranged at the lowest position will be described. When the positive column parts 11 and 13 are made to emit light,
Illumination light is obtained by the phosphor α, but the light distribution characteristics are asymmetrical. For example, when the positive column portions 12 and 14 are made to emit light, the light intensity is the illumination light by the phosphor β, and the light intensity on the lower right side of the paper is lower than the light intensity on the lower left side of the paper. When the positive column portions 11 and 12, the positive column portions 12 and 13, the positive column portions 13 and 14, or the positive column portions 14 and 11 are made to emit light, although there are color differences in the light emitting portions, the phosphor α is used as illumination light. And the phosphor β can be mixed. Further, since the emission of light from the positive column portions 13 and 14 toward the bottom of the paper is blocked by the tube surface of the positive column portions 11 and 12, when the emission of the positive column portions 13 and 14 is involved, the phosphor is mixed in the light. The contribution of light emission due to β becomes small.

As described above, in the lighting device in which the electrodes are turned on sideways as shown in FIG. 13, the illuminance, chromaticity, and light distribution can be controlled by selecting the combination of the mounting angle and the positive column portion to emit light. it can.

Although the case where there are four positive column portions and two types of phosphors has been described, the same effect can be obtained even when there are four or more positive column portions or two or more types of phosphors.

Next, in the polygon formed by the tube axis center of the positive column, the case where the phosphor coated on the positive column section whose both ends are the tube axis centers is the same, the positive column section shown in FIG. The four fluorescent lamps will be described.

In FIG. 10, the first positive column portion 11 and the second positive column portion 12 forming one side of a quadrangle formed by the center of the tube axis are provided with a phosphor α, a third positive column portion 13 and a fourth positive column portion 13. The phosphor β is applied to the positive column portion 14. In the fluorescent lamp configured as described above, there is a condition that the positive column portions having the same light color are adjacent to each other.

When the thus constructed fluorescent lamp is turned on so that the positive column portion is in the horizontal direction as shown in FIG. 13, the illuminance, chromaticity and light distribution of the illuminating light depend on the combination of the applied phosphors, It depends on the positive column part that emits light and the mounting angle of the fluorescent lamp. The case where the electrodes are turned on sideways will be described with reference to FIG.

It is assumed that, as shown in FIG. 13A, the electrodes are lit sideways and one positive column portion is arranged at the bottom. For example, when the positive column portions 11 and 13 are caused to emit light, the light emission by the phosphor α and the light emission by the phosphor β are mixed, but the light emission by the phosphor β is dominant. The light distribution is the same on the left and right sides of the paper. When the positive column portions 12 and 14 are made to emit light, the light emission by the fluorescent substance α and the light emission by the fluorescent substance β are equally divided immediately below, and the light emission of the fluorescent substance α is dominant at the lower left side of the paper,
On the lower right side of the paper, the light emission by the phosphor β is dominant. When the positive column portions 11 and 12 are made to emit light, the light is emitted by the phosphor α, and the lower left side of the paper surface has higher luminous intensity than the lower right side. Similarly, the chromaticity and the light distribution differ depending on the combination of the positive column portions that emit light.

Next, as shown in FIG. 13B, the case where the two positive column portions are arranged at the lowest position will be described. For example, when the positive column portions 11 and 13 are made to emit light, it is the mixed light of the fluorescent substance α and the fluorescent substance β, the mixed light mainly controlled by the fluorescent substance α is on the lower left side of the paper, and is substantially equal on the lower right side of the paper. It is a mixed light. Hereinafter, the chromaticity and the light distribution are different depending on the combination of the positive column portions that similarly emit light.

As described above, when the positive column portion is turned on in the horizontal direction as shown in FIG. 13, the illuminance, the chromaticity, and the illuminance are determined by selecting the combination of the mounting angle and the positive column portion to emit light. The light distribution can be controlled.
Although the fourth embodiment has been described with respect to the case where there are four positive columns and two types of phosphors, if the number of positive columns is four or more or there are two or more types of phosphors, the illuminance, chromaticity, and light distribution. However, more complex combinations are possible.

Next, a season sensor or a timer for detecting the season is provided, and the correlated color temperature of the luminescent color is radiated in the season so that it becomes higher in summer than in winter, for example, 5000 K in summer and 3000 K in winter. A configuration for controlling the emission color of light will be described. As a seasonal sensor, a 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, or 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.

A case where the fluorescent lamp shown in FIG. 1 is driven by using the lighting device shown in FIG. 5 will be described. In the fluorescent lamp of FIG. 1, x = 0.40 to 0.44, y = in the xy chromaticity diagram of the first positive column portion 11 and the second positive column portion 12.
A phosphor for obtaining light emission (correlated color temperature 3000K) at 0.38 to 0.42 is applied, and x = 0.33 to 0.37, y on the third positive column portion 13 and the fourth positive column portion 14. = 0.3
A phosphor that emits light at 3 to 0.37 (correlated color temperature 5000K) is applied in advance. When it is determined that it is summer based on the signal from the season sensor or the timer, the third electrode 23
And the fourth electrode 24 is discharged to generate a correlated color temperature 500.
The illumination light is 0K. When it is judged to be winter, the first electrode 2
A correlated color temperature of 30 is generated by discharging between the first and second electrodes 12.
The illumination light is 00K. These switching is performed by changing the base input signals w1, w2, x1, x2, y1, y2, z1, z.
It can be performed by control of 2.

Further, using the fluorescent lamp shown in FIG. 10, for example, as shown in FIG. 13B, the fluorescent lamp is mounted sideways and a reflector (not shown) is arranged so as to cover the positive column portion. With a fluorescent lamp mounting angle of 18
The lighting device is connected so that it can be switched at 0 degrees and the lower two positive column parts emit light. In such an illuminating device, the third positive column portion 13 and the fourth positive column portion 14 are at the bottom in summer, and the first positive column portion 11 and the second positive column portion 12 are at the bottom in winter. It can also be realized by doing.

With the above structure, a light source with a refreshing light color in summer and a light color with warmth in winter can be realized by one type of fluorescent lamp.

Next, a case will be described in which the difference from the peak season of the adjacent season is calculated based on the output from the season sensor or the timer, and the discharge of the different route is adjusted based on the difference. . For example, FIG. 8 shows the fluorescent lamp shown in FIG. 5 in an area 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 summer and 15 degrees Celsius or less in winter. It is assumed that the lighting device is used to drive the wiring shown in FIG.

However, in the fluorescent lamp of FIG.
In the xy chromaticity diagram of the positive column portion 12 of x = 0.48-0.5
2, a phosphor for obtaining light emission of y = 0.43 to 0.47 is applied, and x = 0.33 to 0.37, y = 0 is applied to the third positive column portion 13 and the fourth positive column portion 14. A phosphor that emits light of 0.33 to 0.37 (correlated color temperature of 5000 K) is applied.

When the light emitted from the second positive column portion 12 and the light emitted from the third positive column portion 13 are mixed, an illumination light having a correlated color temperature of 3000K is obtained. When the measured value of the outside air temperature is 25 degrees Celsius or more, it can be determined that it is summer. Therefore, by setting the base input signals l1 and l2 to zero and inputting the reverse phase alternating signals to m1 and m2, the third electrode 23 and Discharge is performed only between the fourth electrodes 24. As a result, illumination light having a correlated color temperature of 5000K is obtained.

When the measured value of the outside air temperature is less than 15 degrees Celsius, it can be determined that it is winter, so the base input signals m1 and m
By setting 2 to 0 and inputting alternating signals of opposite phases to l1 and l2, discharge is performed only between the second electrode 22 and the second electrode 23. As a result, the correlated color temperature of 3000
Obtain K illumination light.

When the measured value of the outside air temperature is 21 degrees Celsius, it is 4 degrees away from the threshold value in summer and 6 degrees away from the threshold value in winter. 60%,
Suppose that 40% is required for winter. Therefore, l1, l
Input all control signals 2, m1, m2. By setting the frequencies of the base input signals l1 and l2 and the frequencies of m1 and m2 so that the light emission ratio becomes 6: 4 in each discharge, it is possible to obtain illumination light suitable for the season. 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, and the discharge path is switched to a discharge path not involving 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. 5, it is assumed that the emitter loss occurs due to the discharge between the second electrode 22 and the third electrode 23.

In FIG. 5, normally, the X-choke coil 52-the second electrode 22-the second positive column portion 12-
Junction b12-third positive column portion 13-third electrode 23
-The current flowing in the choke coil 53-Y is the X-choke coil 51-the second electrode 22-the capacitor group (61 to 61-
66) -flowing through the third electrode 23-the choke coil 53-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, it is possible to know whether or not the discharge state is normal by measuring the current flowing through the power transistors 43 to 46 and the choke coil 52 or 53. it can.

When one electrode has an emitter loss, an overcurrent always flows in two discharge paths.
For example, if the second electrode 22 has an emitter loss, an abnormality is detected in all discharges involving that electrode. 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 w1, w2, x1, x2, y1, y2, z1, so as to switch to the discharge path in which the electrode causing the loss is not involved.
Switch z2.

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.

[0064]

As described above, according to the present invention, it is possible to obtain a wide variety of different light colors with one lamp according to the season, and it is possible to easily realize illumination with a rich sense of the season.

[Brief description of drawings]

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

FIG. 2 is a diagram showing a second structure of the fluorescent lamp.

FIG. 3 is a diagram showing a third structure of the fluorescent lamp.

FIG. 4 is a diagram showing a fourth structure of the fluorescent lamp.

FIG. 5 is a first principle diagram of the lighting device according to the present embodiment.

FIG. 6 is a wiring diagram with the fluorescent lamp in the first principle diagram.

FIG. 7 is a timing chart of a discharge base input signal between the electrodes.

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

FIG. 9 is a wiring diagram with a fluorescent lamp in the second principle diagram.

FIG. 10 is a cross-sectional view of the fluorescent lamp according to the present embodiment with four positive columns.

FIG. 11 is a cross-sectional view of the fluorescent lamp according to the present embodiment with five positive columns.

FIG. 12 is a cross-sectional view of the fluorescent lamp according to the present embodiment with six positive columns.

FIG. 13A is a sectional view of the positive column portion in the direction perpendicular to the tube axis showing an example of the lighting state of the present embodiment. FIG. 13B is another sectional view of the positive column portion in the direction perpendicular to the tube axis.

FIG. 14 is a structural diagram of a conventional fluorescent lamp.

[Explanation of symbols]

 10 Lighting Device 11-16 First to Sixth Positive Column Part 21-25 First to Fifth Electrodes 31-35, 39 Junction 40 DC Power Supply 41-48 Power Transistor 51-54 Choke Coil 61-66 Capacitor 71 -74 power transistor 81,82 capacitor 91,92 choke coil 101,102 capacitor

Claims (5)

[Claims] 1. A tube surface of at least one of the positive column portions having four or more positive column portions each having an electrode on one end side thereof, and joining the other end side having no electrodes at the positive column portions. A fluorescent lamp in which the fluorescent material applied to the other fluorescent material is different from the fluorescent material applied to the other tube surface, a means for switching the discharge path between any two electrodes, and a season sensor or timer for detecting the season, A lighting device characterized in that the emission color of emitted light is controlled so that the correlated color temperature of the emission color varies depending on the detected season. 2. 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. 3. The illuminating device according to claim 2, wherein in the polygon formed by the tube axis center of the positive column, the same phosphor is applied to the positive column section whose both ends of the diagonal line are the tube axis centers. 4. The illuminating device according to claim 2, wherein in the polygon formed by the tube axis center of the positive column, the same phosphor is applied to the positive column portion whose both ends are the tube axis centers. 5. The method according to claim 1, wherein a difference between the peak season of the adjacent season is calculated based on the output from the season sensor or the timer, and the emission color is controlled based on the difference. Lighting equipment.