JP2016143591A - Luminaire and lighting apparatus using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire that enhances convenience while implementing a comfortable illumination space having little discomfort and little unpleasantness, and a lighting apparatus using the luminaire.SOLUTION: A luminaire 1 comprises light emission diodes 110, 120, a detector 18 for detecting the luminosity of an illumination face, and a controller 15 for controlling the dimming ratio of each of the light emission diodes 110, 120 based on the detection result of the detector 18. The controller 15 controls the dimming ratios of the light emission diodes 110, 120 so that the dimming ratio of mixture light based on the light emission diodes 110, 120 decreases as the luminosity of the illumination face which is detected by the detector 18 increases, and the color temperature of the mixture light approaches to a first color temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a lighting device and a lighting fixture using the same, and more particularly to a lighting device using a light emitting element as a light source and a lighting fixture using the same.

  2. Description of the Related Art Conventionally, there has been provided an illuminating device having an automatic dimming function that performs dimming according to daylight (external light) using a plurality of LEDs (light emitting diodes) having different emission colors as light sources (see, for example, Patent Document 1). ). The illumination device described in Patent Document 1 includes a white light LED and a light bulb color LED (light emitting element), a lighting circuit unit (control unit) that controls the dimming level of each color LED, and each color LED. The sensor part (detection part) which detects the brightness of the to-be-irradiated surface irradiated with light from is provided.

  The sensor unit is a brightness sensor such as a photodiode, and outputs a voltage corresponding to the amount of incident light to the lighting circuit unit. The lighting circuit unit controls the dimming level of each color LED separately so that the voltage value input from the sensor unit becomes a preset target value.

JP 2012-129021 A

  In the illumination device described in Patent Document 1 described above, although the brightness including the daylight can be detected by the sensor unit, the dimming according to the daylight can be realized, but the LED of each color according to the color temperature of the daylight. The color temperature cannot be adjusted, and there may be a sense of incongruity or discomfort depending on the time of day. Further, in this lighting device, when the color temperature of illumination light (mixed color light) is to be changed according to the color temperature of daylight, manual operation by a remote controller is necessary.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a lighting device that improves convenience while realizing a comfortable lighting space with less discomfort and discomfort and a lighting fixture using the same. .

  The illuminating device of the present invention is an illuminating device that irradiates an irradiation surface with mixed light in which light emitted from at least two types of light emitting elements having different color temperatures is mixed, and the at least two types of light emitting elements. A detection unit that detects the brightness of the irradiated surface, a control unit that controls the dimming ratios of the at least two types of light emitting elements based on the detection results of the detection unit, and the color temperature of the mixed light A setting unit for setting, and the control unit controls a dimming ratio of the at least two types of light emitting elements so that a color temperature of the mixed color light becomes a color temperature set by the setting unit, The control unit decreases the dimming ratio of the mixed color light as the brightness of the irradiation surface detected by the detection unit becomes brighter, and the mixed color light regardless of the color temperature set by the setting unit. Color temperature Wherein at least two so as to approach to the first color temperature is an intermediate color temperature of the color temperature of the light emitting element, and controlling the dimming ratio of the at least two light emitting elements, respectively.

  The lighting fixture of this invention is equipped with the above-mentioned lighting device and the fixture main body holding the said lighting device, It is characterized by the above-mentioned.

  According to the configuration of the present invention, there is an effect that it is possible to provide an illumination device that improves convenience while realizing a comfortable illumination space with less discomfort and discomfort, and an illumination fixture using the illumination device.

FIG. 1A is a schematic block diagram of a lighting device according to an embodiment of the present invention, and FIG. 1B is a circuit configuration diagram of a lighting circuit unit used in the lighting device according to the embodiment of the present invention. It is a graph explaining operation | movement of the illuminating device which concerns on embodiment of this invention. 3A and 3B are explanatory views for explaining the operation of the conventional lighting device. 4A and 4B are explanatory diagrams for explaining the operation of the lighting apparatus according to the embodiment of the present invention. 5A and 5B are graphs for explaining the operation of the illumination device according to the embodiment of the present invention. It is a disassembled perspective view of the lighting fixture which concerns on embodiment of this invention.

  The lighting device 1 and the lighting fixture 10 according to the embodiment of the present invention will be specifically described with reference to FIGS. However, the configuration described below is merely an example of the present invention, and the present invention is not limited to the following embodiment. Therefore, various modifications other than this embodiment can be made according to the design and the like as long as they do not depart from the technical idea of the present invention.

  As shown in FIG. 1A, the lighting device 1 of the present embodiment includes a first light source unit 11 and a second light source unit 12, a first lighting circuit unit 13 and a second lighting circuit unit 14, a control unit 15, and a power. The rate improvement circuit 16, the receiving part 17, and the detection part 18 are provided.

  The first light source unit 11 includes, for example, a series circuit of one or more light emitting diodes 110 that emit light having a correlated color temperature of 6500K (cool light). The second light source unit 12 includes a series circuit of one or more light emitting diodes 120 that emit light having a correlated color temperature of 2700K (warm color light), for example.

  The first light source unit 11 emits light (lights up) when a current flows by applying a voltage obtained by multiplying the forward voltage of the light emitting diode 110 by the number (hereinafter referred to as drive voltage). Similarly, the second light source unit 12 emits light (lights up) when a current flows by applying a voltage obtained by multiplying the forward voltage of the light emitting diode 120 by the number (hereinafter referred to as drive voltage). Here, in the present embodiment, at least two types of light emitting elements are configured by the light emitting diodes 110 and 120.

  In the Japanese Industrial Standards (JIS Z9110 Lighting Standard General Rules), the light color with a correlated color temperature of less than 3300K is “warm”, the light color with more than 5300K is “cool”, and the light color in the range of 3300K to 5300K is “intermediate color” Is defined.

  The power factor correction circuit 16 includes a conventionally known step-up chopper circuit, and outputs a DC voltage higher than the AC voltage supplied from the commercial AC power supply 100.

  The first lighting circuit unit 13 includes a switching power supply circuit that steps down the DC voltage output from the power factor correction circuit 16 to a DC voltage having a desired voltage value (drive voltage of the first light source unit 11). Similarly, the second lighting circuit unit 14 includes a switching power supply circuit that steps down the DC voltage output from the power factor correction circuit 16 to a DC voltage having a desired voltage value (drive voltage of the second light source unit 12). .

  As shown in FIG. 1B, the first lighting circuit unit 13 includes a step-down chopper circuit and a drive circuit 130 that drives the step-down chopper circuit. Similarly, the second lighting circuit unit 14 includes a step-down chopper circuit and a drive circuit 140 that drives the step-down chopper circuit.

  The step-down chopper circuit is well known in the art, and the cathode of the diode D1 is connected to the output terminal on the positive side of the power factor improvement circuit 16, and between the anode of the diode D1 and the output terminal on the negative side of the power factor improvement circuit 16. A series circuit of switching element Q1 and resistor R1 is inserted.

  A smoothing capacitor C1 made of an electrolytic capacitor and an inductor L1 are connected in series between the cathode and anode of the diode D1, and a discharging resistor R2 is connected to both ends of the smoothing capacitor C1. Further, the light emitting diode 110 of the first light source unit 11 and the light emitting diode 120 of the second light source unit 12 are connected in series between both ends of the smoothing capacitor C1.

  In the step-down chopper circuit configured as described above, the switching element Q1 is switched at a high frequency, so that the DC voltage stepped down from the input voltage (the output voltage of the power factor correction circuit 16) is higher than both ends of the smoothing capacitor C1. It is output to the first light source unit 11 and the second light source unit 12. The drive circuit 130 switches the switching element Q1 according to the control signal S1 given from the control unit 15, and the drive circuit 140 switches the switching element Q1 according to the control signal S2 given from the control unit 15.

  The control unit 15 includes hardware such as a microcomputer and a memory (for example, ROM, RAM, etc.), and a program (software) stored in the ROM and executed by the microcomputer. And the operation | movement (process) of the control part 15 demonstrated below is implement | achieved when a microcomputer runs a program. The operating power supply of the control unit 15 is created from the output voltage of the power factor correction circuit 16 by the power supply circuit.

  Here, the control unit 15 intermittently operates the switching power supply circuits of the first lighting circuit unit 13 and the second lighting circuit unit 14, and the duty ratio of the operation period (on period) with respect to the cycle of the intermittent operation is 100%. Increase or decrease within the range of the lower limit (for example, 5%). Thereby, the light output of the 1st light source part 11 and the 2nd light source part 12 can be adjusted (light control).

  That is, the light output of the first light source unit 11 and the second light source unit 12 increases as the duty ratio increases, and the light output of the first light source unit 11 and the second light source unit 12 decreases as the duty ratio decreases. When the duty ratio is 100% (upper limit of the dimming range), the switching power supply circuit is always operated and the first light source unit 11 and the second light source unit 12 are lit at rated power. In the following description, the above-described duty ratio is referred to as a dimming ratio.

  In the present embodiment, the emission color (cool color) of the first light source unit 11 and the emission color (warm color) of the second light source unit 12 are different. Therefore, the control unit 15 changes the ratio between the light output (dimming ratio) of the first light source unit 11 and the light output (dimming ratio) of the second light source unit 12, thereby causing the first light source unit 11 and the second light source unit 11 to change. The color of light (hereinafter referred to as illumination light) emitted from the light source unit 12 toward the irradiation surface can be adjusted (toned) among warm colors, intermediate colors, and cool colors.

  That is, as the ratio of the light output (dimming ratio) of the first light source unit 11 increases, the light color approaches a cool color, and as the ratio of the light output (dimming ratio) of the second light source unit 12 increases, the light color changes. Close to warm colors. When the dimming ratio of the first light source unit 11 is higher than 0% and the dimming ratio of the second light source unit 12 is 0%, the light color becomes cool, and the dimming of the first light source unit 11 is performed. When the ratio is 0% and the dimming ratio of the second light source unit 12 is higher than 0%, the light color becomes a warm color.

  In the following description, the ratio (ratio) between the dimming ratio of the first light source unit 11 and the dimming ratio of the second light source unit 12 is called a toning ratio, and the dimming ratio of the first light source unit 11 and The sum of the dimming ratios of the two light sources 12 (the dimming ratio of the illumination light) is called the total dimming ratio.

  Here, in the present embodiment, the microcomputer constituting the control unit 15 can set the color temperature of the mixed color light by the first light source unit 11 and the second light source unit 12, and the microcomputer sets the setting unit. Composed. Then, the control unit 15 adjusts the dimming ratios of the first light source unit 11 and the second light source unit 12 so that the color temperature of the mixed color light becomes the color temperature set by the setting unit. The operation of the control unit 15 will be described later.

  The receiving unit 17 receives (receives) an infrared signal transmitted from a remote controller (hereinafter abbreviated as a remote controller), and outputs a control code demodulated from the received infrared signal to the control unit 15. And the control part 15 controls the 1st lighting circuit part 13 and the 2nd lighting circuit part 14 so that it may become the total dimming ratio and toning ratio corresponding to a control code (light control command or toning command). The dimming ratio of the first light source unit 11 and the second light source unit 12 is adjusted.

  The signal transmitted from the remote controller is not limited to an infrared signal, but may be a radio signal using radio waves as a medium or an electric signal via a signal line.

  The detection unit 18 includes a photoelectric conversion element such as a photodiode or a solar cell, and outputs an electric signal (detection signal) of a level corresponding to the brightness of an irradiation surface such as a floor surface to the control unit 15.

  FIG. 2 is a graph for explaining the operation of the illumination device 1 of the present embodiment. Point P1 in FIG. 2 is a case where the total dimming ratio, which is the sum of the dimming ratio of the first light source unit 11 and the dimming ratio of the second light source unit 12, is set to 100%. The color temperature of the mixed color light by the light source unit 11 and the second light source unit 12 is 2700K. A point P2 in FIG. 2 corresponds to a case where the total dimming ratio is set to 50%. At this time, the color temperature of the mixed color light is a value between 2700K and 5000K.

  Further, a point P3 in FIG. 2 is a case where the total dimming ratio is set to 70%, and at this time, the color temperature of the mixed color light is a value between 5000K and 6500K. Further, a point P4 in FIG. 2 is a case where the total light control ratio is set to 100%. At this time, the color temperature of the mixed color light is 6500K.

  And the control part 15 approaches the point P5 from the state set to either of the points P1-P4 as the brightness of the irradiation surface detected by the detection part 18, in other words, the luminous flux of external light increases. In addition, the total dimming ratio is changed linearly. The point P5 is when the total dimming ratio is set to 5%, and the color temperature of the mixed color light is 5000K at this time.

  Here, in the present embodiment, the above color temperature 5000K is an intermediate color temperature between the color temperature 6500K of the first light source unit 11 (light emitting diode 110) and the color temperature 2700K of the second light source unit 12 (light emitting diode 120). Yes, this color temperature is the first color temperature. The first color temperature is preferably close to the color temperature of external light (for example, 5000 K) as in the present embodiment.

  Further, the control unit 15 performs the total dimming so that the point P6 approaches as the dimming ratio of the mixed color light is reduced by the manual operation from the state set to any of the points P1 to P4. The ratio is varied linearly up to 5%. At this time, the color temperature of the mixed color light is 2700 K regardless of the color temperature set by the setting unit.

  That is, in the present embodiment, when the dimming ratio of the mixed color light is reduced by manual operation, the color temperature of the mixed color light is the second light source unit having the lowest color temperature among the first light source unit 11 and the second light source unit 12. The light control ratio of the first light source unit 11 and the second light source unit 12 is adjusted so as to approach the color temperature of 12. Thereby, a calm and warm atmosphere can be realized. Here, in the present embodiment, the automatic light control mode for moving from the above points P1 to P4 to the point P5 is the first mode, and the manual mode for moving from the above points P1 to P4 to the point P6 is the second mode. is there.

  3A and 3B are explanatory views for explaining the operation of the conventional lighting device. FIG. 3A shows a case where the color temperature of the illumination light (mixed color light by the first light source unit 11 and the second light source unit 12) is set to 6500K, and the dimming ratio of the illumination light as the luminous flux of natural light (external light) increases. Reduce. In this case, the color temperature of the illumination light is constant at 6500K regardless of the size of the natural light beam.

  FIG. 3B shows a case where the color temperature of the illumination light is set to 2700 K. Similarly, the dimming ratio of the illumination light is lowered as the natural light flux increases. In this case as well, the color temperature of the illumination light is constant at 2700K regardless of the size of the natural light beam.

  As described above, when the color temperature of the illumination light is constant regardless of the size of the natural light flux, the difference between the color temperature of the illumination light and the color temperature of the natural light increases as the natural light flux increases. Depending on the belt, you may feel uncomfortable or uncomfortable. In particular, as shown in FIG. 3B, when the color temperature of the illumination light is set to a warm color (2700 K), the difference between the color temperature of the illumination light and the color temperature of the natural light becomes significant in the daytime zone (broken line in FIG. 3B). a1).

  Therefore, in this embodiment, in order to reduce the difference between the color temperature of the illumination light and the color temperature of the natural light, the dimming ratio (total dimming ratio) of the illumination light is decreased as the luminous flux of the natural light increases, and Regardless of the color temperature set by the setting unit, the color temperature of the illumination light is brought close to the first color temperature. In the following description, the first color temperature is set to 5000K (natural light color temperature).

  When the color temperature of the illumination light is set to 6500K by the setting unit, the control unit 15 changes the color temperature of the illumination light to the first color temperature as the luminous flux of natural light increases from morning to noon as shown in FIG. 4A. The values are decreased in the order of 6000K, 5500K, and 5000K so as to approach each other. At this time, as shown in FIG. 5A, the control unit 15 reduces the total dimming ratio in accordance with the decrease in the color temperature of the illumination light. As a result, the ratio of natural light contributing to the brightness of the irradiated surface gradually increases from morning to noon (see FIG. 4A).

  As shown in FIG. 4A, the control unit 15 increases the color temperature of the illumination light in the order of 5500K, 6000K, and 6500K as the natural light flux decreases from daytime to evening and night. At this time, as shown in FIG. 5A, the control unit 15 increases the total dimming ratio in accordance with the increase in the color temperature of the illumination light. As a result, the proportion of illumination light that contributes to the brightness of the irradiated surface gradually increases from daytime to evening and night (see FIG. 4A).

  On the other hand, when the color temperature of the illumination light is set to 2700K by the setting unit, as shown in FIG. 4B, the control unit 15 sets the color temperature of the illumination light to the first color as the natural light flux increases from morning to noon. The temperature is increased in the order of 3000K, 4000K, and 5000K so as to approach the temperature. At this time, as illustrated in FIG. 5B, the control unit 15 decreases the total dimming ratio in accordance with the increase in the color temperature of the illumination light. As a result, the ratio of natural light that contributes to the brightness of the irradiated surface gradually increases from morning to noon (see FIG. 4B).

  Further, as illustrated in FIG. 4B, the control unit 15 decreases the color temperature of the illumination light in the order of 4000K, 3500K, and 2700K as the natural light flux decreases from daytime to evening and night. At this time, as shown in FIG. 5B, the control unit 15 increases the total dimming ratio in accordance with the decrease in the color temperature of the illumination light. As a result, the proportion of illumination light that contributes to the brightness of the irradiated surface gradually increases from daytime to evening and night (see FIG. 4B).

  In the present embodiment, as described above, the illumination light is adjusted so that the color temperature of the illumination light approaches the first color temperature in the daytime when the difference between the color temperature of the natural light and the color temperature of the illumination light is significant. The light ratio (total light control ratio) and toning ratio are adjusted. As a result, the difference between the color temperature of natural light and the color temperature of illumination light can be reduced as compared with the conventional illumination device. In particular, when the color temperature of illumination light is set to a warm color (2700 K), the above-described effects are obtained. It becomes noticeable (see broken line a2 in FIG. 4B).

  FIG. 6 is an exploded perspective view of a lighting fixture 10 using the lighting device 1 described above. The luminaire 10 according to the present embodiment is, for example, a luminaire that is detachably attached to a hook ceiling and disposed on a ceiling, and is generally called a ceiling light. The lighting fixture to which the technical idea according to the present invention can be applied is not limited to a ceiling light.

  The lighting fixture 10 of the present embodiment includes a fixture main body 2, a power feeding unit 3, a plurality (four in FIG. 6) of LED units 4, a light distribution panel 5, and a cover 6. The instrument main body 2 is formed in a disk shape by a metal plate material, and a power feeding unit 3 that is electrically and mechanically detachably coupled to the hooking ceiling is disposed in the central portion.

  In the LED unit 4, a plurality of light emitting diodes are mounted in two rows in an arc shape on the surface (lower surface) of a mounting substrate 40 that is curved in an arc shape. On the mounting substrate 40 of each LED unit 4, a cool color light emitting diode 110 constituting the first light source unit 11 and a warm color light emitting diode 120 constituting the second light source unit 12 are mixedly mounted. And these LED units 4 are attached to the lower surface of the instrument main body 2 along with the circumferential direction centering on the electric power feeding part 3. As shown in FIG.

  The light distribution panel 5 is formed in an annular shape from a light-transmitting synthetic resin such as an acrylic resin or a polycarbonate resin, and is fixed to the fixture body 2 so as to cover the lower surfaces of the four LED units 4. An optical component 50 for integrally controlling the light distribution of the light emitted from the light emitting diodes is integrally formed at a portion of the light distribution panel 5 facing each light emitting diode.

  The cover 6 is formed of a light-transmitting synthetic resin such as an acrylic resin or a polycarbonate resin into a flat cylindrical shape with an upper surface opened, and the LED main unit 4 and the light distribution panel 5 are housed inside the instrument body. 2 is detachably attached to the lower surface. However, the attachment structure of the cover 6 to the instrument body 2 is a well-known structure in a general ceiling light, and thus detailed description thereof is omitted here.

  In addition, among each part which comprises the illuminating device 1, the 1st lighting circuit part 13 except the 1st light source part 11 and the 2nd light source part 12, the 2nd lighting circuit part 14, the control part 15 (a setting part is included), and force The rate improvement circuit 16 is disposed around the power supply unit 3 on the upper surface side of the instrument body 2. The power factor correction circuit 16 is supplied with power from the commercial AC power supply 100 by being connected to the power supply unit 3 through a power supply line.

  As described above, in the present embodiment, as the luminous flux of the external light increases, the dimming ratio of the mixed color light by the first light source unit 11 and the second light source unit 12 is decreased, and the color temperature of the mixed color light is changed to the first. The dimming ratio of the first light source unit 11 and the second light source unit 12 is adjusted so as to approach one color temperature. As a result, the color temperature of the illumination light can be brought close to the color temperature of the external light while suppressing the influence of the illumination light (mixed color light), and as a result, a comfortable illumination space with less discomfort and discomfort can be realized. .

  Moreover, unlike the conventional lighting fixture, the manual operation for changing the color temperature of illumination light is unnecessary, and the highly convenient lighting device 1 can be provided. Furthermore, when the first color temperature, which is an intermediate color temperature between the first light source unit 11 and the second light source unit 12, is made closer to the color temperature of the external light as in the present embodiment, the sense of incongruity and incompatibility are further increased. An illumination space with less pleasure can be realized.

  In the present embodiment, in the second mode that does not consider external light, the second light source unit 12 has the lowest color temperature as the color temperature of the mixed color light is adjusted in the direction in which the dimming ratio of the mixed color light decreases. The dimming ratios of the first light source unit 11 and the second light source unit 12 are adjusted so as to approach the color temperature of the light source. Thereby, a calm and warm atmosphere can be realized. And by using the above-mentioned illuminating device 1, the lighting fixture 10 which improved the convenience can be provided, implement | achieving the comfortable illumination space with few discomfort and discomfort.

  Note that the types of light emitting diodes are not limited to two, and may be three or more as long as the color temperatures are different. Further, the light emitting element is not limited to the light emitting diode, and may be, for example, an organic EL element. Moreover, in this embodiment, when changing from the point P1-P4 to the point P5 or the point P6 in FIG. 2, it changed linearly, However, You may change in a curve and is not limited to this embodiment.

  As described above, the illuminating device 1 according to the present embodiment directs mixed color light, which is a mixture of light emitted from the light emitting diodes 110 and 120 (at least two types of light emitting elements) having different color temperatures, toward the irradiation surface. It is the illuminating device to irradiate. The lighting device 1 includes light emitting diodes 110 and 120, a detection unit 18, a control unit 15, and a setting unit (a microcomputer constituting the control unit 15). The detection unit 18 detects the brightness of the irradiated surface. The control unit 15 controls the dimming ratios of the light emitting diodes 110 and 120 based on the detection result of the detection unit 18, respectively. The setting unit sets the color temperature of the mixed color light. The control unit 15 controls the dimming ratios of the light emitting diodes 110 and 120 so that the color temperature of the mixed color light becomes the color temperature set by the setting unit. The control unit 15 decreases the dimming ratio of the mixed color light as the brightness of the irradiation surface detected by the detection unit 18 becomes brighter, and sets the color temperature of the mixed color light to the first regardless of the color temperature set by the setting unit. The dimming ratios of the light emitting diodes 110 and 120 are controlled so as to approach one color temperature. The first color temperature is an intermediate color temperature between the color temperatures of the light emitting diodes 110 and 120.

  According to the above configuration, the dimming ratio of the light emitting diodes 110 and 120 is reduced so that the dimming ratio of the mixed color light is lowered and the color temperature of the mixed color light is brought closer to the first color temperature as the luminous flux of the external light increases. Control each. As a result, the color temperature of the illumination light can be brought close to the color temperature of the external light while suppressing the influence of the illumination light (mixed color light), and as a result, a comfortable illumination space with less discomfort and discomfort can be realized. . Moreover, unlike the conventional lighting fixture, the manual operation for changing the color temperature of illumination light is unnecessary, and the highly convenient lighting device 1 can be provided.

  In addition, like the lighting device 1 of the present embodiment, the control unit 15 preferably controls the dimming ratios of the light emitting diodes 110 and 120 so that the first color temperature approaches the color temperature of the external light.

  According to the said structure, the color temperature of illumination light (mixed color light) can be brought close to the color temperature of external light, and the illumination space with less discomfort and discomfort can be implement | achieved.

  Moreover, it is preferable that the control part 15 has 1st mode and 2nd mode like the illuminating device 1 of this embodiment. The first mode is a mode for controlling the toning ratio of the mixed color light according to the brightness of the irradiated surface detected by the detection unit 18. The second mode is a mode for controlling the toning ratio of the mixed color light regardless of the brightness of the irradiated surface detected by the detection unit 18. Then, in the second mode, the control unit 15 adjusts the color temperature of the mixed color light to the second color temperature regardless of the color temperature set by the setting unit as the light is adjusted in the direction in which the dimming ratio of the mixed color light decreases. The dimming ratios of the light emitting diodes 110 and 120 are controlled so as to approach each other. The second color temperature is the color temperature of the light emitting diode 120 having the lowest color temperature among the light emitting diodes 110 and 120.

  According to the above configuration, in the second mode that does not consider external light, the light emitting diode is configured so that the color temperature of the mixed color light approaches the second color temperature as the light adjustment ratio decreases in the direction in which the dimming ratio of the mixed color light decreases. The dimming ratios 110 and 120 are respectively controlled. Thereby, a calm and warm atmosphere can be realized.

  The lighting fixture 10 according to the present embodiment includes the lighting device 1 and a fixture body 2 that holds the lighting device 1.

  According to the said structure, the lighting fixture 10 which improved the convenience can be provided by implement | achieving the comfortable illumination space with few discomfort and discomfort by using the above-mentioned illuminating device 1. FIG.

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Appliance main body 10 Illuminating fixture 15 Control part 18 Detection part 110,120 Light emitting diode (at least 2 types of light emitting element)

Claims (4)

An illumination device that irradiates mixed color light, which is a mixture of light emitted from at least two types of light emitting elements having different color temperatures, toward an irradiation surface,
The at least two types of light emitting elements, a detection unit for detecting brightness of the irradiation surface, and a control unit for controlling a dimming ratio of the at least two types of light emitting elements based on a detection result of the detection unit, A setting unit for setting a color temperature of the mixed color light,
The control unit controls the dimming ratios of the at least two types of light emitting elements so that the color temperature of the mixed color light becomes the color temperature set by the setting unit;
The control unit decreases the dimming ratio of the mixed color light as the brightness of the irradiation surface detected by the detection unit becomes brighter, and the color mixture regardless of the color temperature set by the setting unit The dimming ratios of the at least two light emitting elements are respectively controlled so that the color temperature of light approaches a first color temperature that is an intermediate color temperature between the color temperatures of the at least two light emitting elements. Lighting device.   The lighting device according to claim 1, wherein the control unit controls the dimming ratios of the at least two types of light emitting elements so that the first color temperature approaches the color temperature of external light. The control unit is configured to control a toning ratio of the mixed-color light according to the brightness of the irradiation surface detected by the detection unit, and the brightness of the irradiation surface detected by the detection unit. Regardless of having a second mode for controlling the toning ratio of the mixed color light,
In the second mode, the control unit adjusts the color temperature of the mixed color light regardless of the color temperature set by the setting unit as the light is adjusted in the direction in which the dimming ratio of the mixed color light decreases. 3. The dimming ratio of each of the at least two types of light emitting elements is controlled so as to approach the color temperature of the light emitting element having the lowest color temperature among the two types of light emitting elements. Lighting device.   A lighting fixture comprising: the lighting device according to any one of claims 1 to 3; and a fixture main body that holds the lighting device.

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