JP2018181693A - Luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a luminaire capable of performing color reproduction with light colors near a black body orbit by a low-cost power source circuit.SOLUTION: A luminaire comprises: a light-emitting module 100 having a plurality of light-emitting units 110 different from each other in light color of light emitted thereby; and a power source circuit 200 for outputting a power for causing the light-emitting module 100 to emit light to the light-emitting module 100. The plurality of light-emitting units 110 has: a first light-emitting unit 111; a second light-emitting unit 112 which emits light of a color temperature lower than a color temperature of light emitted by the first light-emitting unit 111; and a third light-emitting part 113 which emits light of a color temperature lower than a color temperature of light emitted by the second light-emitting part 112. The number of outputs of a power supplied from the power source circuit 200 to the light-emitting module 100 is smaller than the number of the plurality of light-emitting units 110. The luminosity of the light-emitting module 100 when of the plurality of light-emitting units 110, only the third light-emitting part 113 emits light is 5% or less.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a luminaire.

  BACKGROUND Conventionally, a luminaire having a function (so-called toning function) capable of changing the light color of illumination light in accordance with the purpose of use or the use condition is known (see, for example, Patent Document 1).

  A conventional luminaire having a toning function includes, for example, a light emitting module having two light emitting units having different light colors, and a power supply circuit capable of independently controlling light output of the two light emitting units of the light emitting module. Is equipped. In such a lighting fixture, the color adjustment of the illumination light can be performed by controlling the light output ratio of the two light emitting units by the power supply circuit.

JP, 2009-110781, A

  However, when the toning of the illumination light is performed using two light emitting units having different light colors, the toning can be performed only on the straight line connecting the two chromaticity points on the chromaticity diagram. For example, when the light emission colors of the two light emitting portions are daylight white and light bulb color, the chromaticity on the straight line connecting the two points of the chromaticity point showing daylight white and the chromaticity point showing light bulb color on the chromaticity diagram. It is only possible to change the color of the illumination light.

  For this reason, in the toning by two light emitting units having different light colors, a color shift occurs between it and the black body locus, and the light color of the illumination light can not be changed to trace the black body locus. It is difficult to reproduce white light that satisfies the entire area of the trajectory.

  Therefore, it may be considered to adjust the illumination light using three light emitting units having different light colors, but if the light outputs of the three light emitting units are independently controlled by the power supply circuit, the power supply circuit becomes complicated or the power The cost of the circuit may increase.

  The present invention has been made to solve such problems, and it is an object of the present invention to provide a luminaire capable of performing color reproduction with a light color close to a black body locus using a low cost power supply circuit. I assume.

  In order to achieve the above object, one aspect of the lighting apparatus according to the present invention is a light emitting module having a plurality of light emitting parts having different light colors of emitted light, and the light emitting module for power for making the light emitting module emit light And the plurality of light emitting units include a first light emitting unit, and a second light emitting unit that emits light having a color temperature lower than a color temperature of light emitted from the first light emitting unit. And a third light emitting unit that emits light of a color temperature lower than a color temperature of light emitted from the second light emitting unit, and the number of outputs of power supplied from the power supply circuit to the light emitting module is the plurality The brightness of the light emitting module is less than 5% when the number of the light emitting units is smaller than the number of the light emitting units and only the third light emitting unit emits light among the plurality of light emitting units.

  According to the present invention, color reproduction can be performed with a light color close to the black body locus using a low cost power supply circuit.

It is a figure which shows typically the example of installation of the lighting fixture which concerns on embodiment. It is a figure showing the circuit composition of the lighting fixture concerning an embodiment. It is a figure showing composition of a light emitting module in a lighting fixture concerning an embodiment. It is a figure which shows the circuit structure of the lighting fixture of the comparative example 1. FIG. It is xy chromaticity diagram which shows the change of the light color of the illumination light by color-adjustment control with the lighting fixture which concerns on embodiment, and the lighting fixture of the comparative example 1. FIG. It is a figure which shows the relationship of the color temperature and brightness in the color-adjustment control of the lighting fixtures which concern on embodiment. It is a figure which shows the flow of an electric current when performing color-adjustment control (color-adjustment control in the case of the largest brightness of FIG. 6) of the lighting fixtures which concern on embodiment. It is a figure which shows the flow of an electric current when performing color-adjustment control (color-adjustment control in the area | region A of FIG. 6) of the lighting fixtures which concern on embodiment. It is a figure which shows the flow of an electric current when performing color-adjustment control (color-adjustment control in the area | region B of FIG. 6) of the lighting fixtures which concern on embodiment. It is a figure which shows the flow of an electric current when performing color-adjustment control (color-adjustment control in the area | region C of FIG. 6) of the lighting fixtures which concern on embodiment. It is a figure which shows the flow of an electric current when performing the toning control (toning control in the case of the minimum brightness of FIG. 6) of the lighting fixtures which concern on embodiment. It is a figure which shows the structure of the light emitting module which concerns on a modification.

  Hereinafter, embodiments of the present invention will be described. Each of the embodiments described below shows a preferable specific example of the present invention. Therefore, the numerical values, shapes, materials, components, arrangement positions and connection forms of the components, and the like described in the following embodiments are merely examples, and are not intended to limit the present invention. Therefore, among the components in the following embodiments, components that are not described in the independent claims indicating the highest concept of the present invention are described as optional components.

  Further, each drawing is a schematic view, and is not necessarily illustrated exactly. Therefore, the scale and the like do not necessarily match in each figure. In the drawings, substantially the same components are denoted by the same reference numerals, and redundant description will be omitted or simplified.

Embodiment
First, the structure of the lighting fixture 1 which concerns on embodiment is demonstrated using FIGS. 1-3. FIG. 1: is a figure which shows typically the example of installation of the lighting fixture 1 which concerns on embodiment. FIG. 2 is a diagram showing a circuit configuration of the lighting fixture 1. FIG. 3 is a view showing the configuration of the light emitting module 100 in the lighting fixture 1.

  As shown in FIG. 1, the luminaire 1 in the present embodiment is a downlight that emits illumination light downward (floor or the like), and is installed on a ceiling 2 of a building. For example, the lighting fixture 1 is embedded in the ceiling 2.

  As shown in FIG. 1, the luminaire 1 includes a lamp unit 10 having a light emitting module 100 and a power supply unit 20 having a power supply circuit 200. For example, the lamp unit 10 is embedded in the opening 2 a of the ceiling 2, and the power supply unit 20 is disposed on the back surface (the ceiling back) of the ceiling 2. The opening 2 a of the ceiling 2 is a mounting hole for attaching the lamp unit 10 to the ceiling 2, and is, for example, a through hole of a circular opening that penetrates the ceiling 2.

  The lamp unit 10 has, for example, a base 11 and a frame 12 fixed to the front of the base 11. The light emitting module 100 is attached to the base 11. The base 11 is made of, for example, a metal material such as aluminum, and not only functions as an attachment portion of the light emitting module 100 but also functions as a heat sink for radiating heat generated by the light emitting module 100. The frame 12 is attached to the opening 2 a of the ceiling 2 by a plate spring or the like.

  The light emitting module 100 emits illumination light of a predetermined color. For example, the light emitting module 100 emits white light as illumination light. As shown in FIG. 2, the light emitting module 100 includes a plurality of light emitting units 110 that emit light of a predetermined color. In the present embodiment, the light emitting module 100 is an LED module, and the light emitting unit 110 which is a light source is configured by an LED.

  The light emitting module 100 includes a plurality of light emitting units 110 that emit different light colors. The plurality of light emitting units 110 is three or more. In the present embodiment, the light emitting module 100 is lower than the color temperature (first color temperature) of the light emitted from the first light emitting unit 111 that emits the light of the first color temperature and the first light emitting unit 111 A second light emitting portion 112 emitting light of a second color temperature which is a color temperature, and a third light emitting portion 112 having a color temperature lower than a color temperature (second color temperature) of light emitted by the second light emitting portion 112 It is configured by three light emitting units 110 with a third light emitting unit 113 that emits light of color temperature.

  As an example, the first light emitting unit 111 emits white light having a color temperature of 6200 K (first color temperature), and the second light emitting unit 112 has a white light having a color temperature of 2200 K (second color temperature). Emits The light color of the third light emitting unit 113 is, for example, red or amber. In the present embodiment, the third light emitting unit 113 emits red monochromatic light having a peak wavelength in the range of 620 nm to 700 nm, and the color temperature (third color temperature) thereof is about 1800K.

  The first light emitting unit 111 is configured of a plurality of LED elements 111 a (first LED elements) connected in series. Specifically, the first light emitting unit 111 is a series connected body in which six LED elements 111a are connected in series. The six LED elements 111a have the same configuration and characteristics (IF-VF characteristics etc.). Therefore, the color temperature of the light of the six LED elements 111a is 6200K. The number of LED elements 111a constituting the first light emitting unit 111 is not limited to six, and may be one or plural other than six.

  The second light emitting unit 112 is configured of a plurality of LED elements 112 a (second LED elements) connected in series. Specifically, the second light emitting unit 112 is a series connected body in which five LED elements 112 a are connected in series. The configuration and characteristics (IF-VF characteristic etc.) of the five LED elements 112a are all the same. Therefore, the color temperature of the light of the five LED elements 112a is 2200K. The number of LED elements 112a constituting the second light emitting unit 112 is not limited to five, and may be one or plural other than five.

  The third light emitting unit 113 is configured of a plurality of LED elements 113 a (third LED elements) connected in series. Specifically, the third light emitting unit 113 is a series connected body in which two LED elements 113a are connected in series. The two LED elements 113a have the same configuration and characteristics (IF-VF characteristics etc.). Therefore, the light color of the light of the two LED elements 113a is red with a color temperature of about 1800K. The number of LED elements 113a constituting the third light emitting unit 113 is not limited to two, and may be one or plural other than two.

  The first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113 are provided on different current paths. That is, the LED element 111a constituting the first light emitting unit 111, the LED element 112a constituting the second light emitting unit 112, and the LED element 113a constituting the third light emitting unit 113 are not connected in series. . In the present embodiment, the LED element 112 a constituting the second light emitting unit 112 and the LED element 113 a constituting the third light emitting unit 113 are connected in parallel.

  Further, assuming that the total amount of forward voltages of a plurality of LED elements connected in series in each light emitting unit 110 is a total Vf (total Vf), in the present embodiment, the value of the total Vf of the element row of each light emitting unit 110 is And the number of LED elements of each light emitting unit 110. Therefore, the total Vf of the first light emitting unit 111 including six LED elements 111a is TVf1, the total Vf of the second light emitting unit 112 including five LED elements 112a is TVf2, and the two LED elements 113a are When the total Vf of the third light emitting unit 113 formed of the above is TVf3, TVf1> TVf2> TVf3.

  The light emitting module 100 further includes a current control circuit 120 in addition to the light emitting unit 110 (the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113).

  The current control circuit 120 is connected to the current control circuit 120 among the plurality of light emitting units 110 in the light emitting module 100 based on the current output ratio according to the amount of current supplied from the power supply circuit 200 to the current control circuit 120. A current is supplied to the light emitting unit 110 of Current control circuit 120 includes a current detection circuit that detects the amount of current supplied from power supply circuit 200 to current control circuit 120.

  In the present embodiment, the current control circuit 120 is connected to the second light emitting unit 112 and the third light emitting unit 113, and the input current supplied to the current control circuit 120 is transmitted to the second light emitting unit 112 and the third light emitting unit. It distributes to the light emission part 113 of 3, and supplies. In this case, the current control circuit 120 detects the amount of current (current value) of the input current input from the power supply circuit 200 to the current control circuit 120. Then, the current output ratio (distribution ratio) of the input current to be distributed to the second light emitting unit 112 and the third light emitting unit 113 is determined according to the detected current amount, and the current control circuit 120 outputs the current output The current is divided between the second light emitting unit 112 and the third light emitting unit 113 at a current amount based on the ratio.

  When current control circuit 120 divides the current into the plurality of light emitting units 110 connected to current control circuit 120, the total amount of forward voltage among the plurality of light emitting units 110 connected to current control circuit 120 is small. Current is flowed preferentially to the light emitting unit 110. Therefore, the current control circuit 120 starts to flow current from the light emitting unit 110 with a small total amount of forward voltage, and the amount of current supplied from the power supply circuit 200 to the current control circuit 120 increases. The current is also split.

  In the present embodiment, the second light emitting unit 112 and the third light emitting unit 113 are connected to the current control circuit 120, and the total amount of forward voltage is the third light emitting from the second light emitting unit 112. The part 113 is smaller. Therefore, the current control circuit 120 first starts to flow current only to the third light emitting unit 113 whose total amount of forward voltage is smaller than that of the second light emitting unit 112, and is supplied from the power supply circuit 200 to the current control circuit 120. As the amount of current increases, the amount of current shunted to the third light emitting unit 113 is increased. Then, when the amount of current supplied from the power supply circuit 200 to the current control circuit 120 further increases and the current flowing to the third light emitting unit 113 becomes maximum, the current control circuit 120 also supplies the current to the second light emitting unit 112. The current flowing through the second light emitting unit 112 is increased.

  The light emitting module 100 configured in this way has, for example, the structure shown in FIG. Specifically, the light emitting module 100 includes the substrate 130, and the plurality of light emitting units 110 (the first light emitting unit 111, the second light emitting unit 112, the third light emitting unit 113) and the current control circuit 120 Are provided on the substrate 130.

  In the present embodiment, the third light emitting unit 113 is disposed at the central portion of the substrate 130. Specifically, two LEDs 113 a constituting the third light emitting unit 113 are arranged side by side at the central portion of the substrate 130.

  In addition, the second light emitting unit 112 is divided into a plurality, and the third light emitting unit 113 is disposed between one of the plurality of second light emitting units 112 and the other. Specifically, the LED element 112a constituting the second light emitting unit 112 is divided into two regions via the third light emitting unit (LED element 113a), and the third light emitting unit 113 is The LED element 113a which comprises is arrange | positioned between the LED element 112a arrange | positioned in one area | region, and the LED element 112a arrange | positioned in the other area | region.

  In addition, the first light emitting unit 111 is disposed between the second light emitting unit 112 and the third light emitting unit 113. Specifically, the LED element 111 a constituting the first light emitting unit 111 is disposed between the LED element 112 a constituting the second light emitting unit 112 and the LED element 113 a constituting the third light emitting unit 113. It is done.

  By arranging the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113 in this manner, the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113 can be obtained. The light emitted from each can be mixed uniformly. In particular, in the case of performing synchro color control on the first light emitting unit 111, the second light emitting unit 112 and the third light emitting unit 113 as described later, the first light emitting unit 111, the second light emitting unit 112 and the third light emitting unit 112 The light emitting unit 113 emits light at one or more of these, but can mix colors uniformly with any brightness.

  In the present embodiment, the LED element 111a constituting the first light emitting unit 111, the LED element 112a constituting the second light emitting unit 112, and the LED element 113a constituting the third light emitting unit 113 are individually packaged. Surface mount device (SMD) type LED element.

  Specifically, each of the LED elements 111a, 112a and 113a is a white resin package (container) having a recess, and one or more LED chips (bare chips) primarily mounted on the bottom surface of the recess of the package; And a sealing member enclosed in the recess of the package. The sealing member is made of, for example, a translucent resin material such as silicone resin.

  The LED chip is an example of a semiconductor light emitting element that emits light by a predetermined direct current power, and is a bare chip that emits monochromatic visible light. In this case, the LED chips in the LED elements 111a and 112a are, for example, blue LED chips that emit blue light when energized, and have peak wavelengths in the range of 440 nm to 470 nm, for example. And in LED element 111a and 112a, in order to obtain white light, yellow fluorescent substance, such as YAG (yttrium aluminum garnet) which carries out fluorescence luminescence by using blue light from a blue LED chip as excitation light, is used as a sealing member. It is contained. In the LED elements 111a and 112a, a part of the blue light of the blue LED chip is absorbed by the yellow phosphor and the yellow phosphor is excited to emit yellow light from the yellow phosphor and absorbed by the yellow light and the yellow phosphor White light is generated by mixing with the blue light that has not been received.

  However, the first light emitting unit 111 emits light having a color temperature higher than the color temperature of the light emitted by the second light emitting unit 112. Therefore, in order to make the color temperature of the light emitted by the first light emitting unit 111 higher than the color temperature of the light emitted by the second light emitting unit 112, the type of phosphor contained in the sealing member (for example, red fluorescent light The chromaticity adjustment of the first light emitting unit 111 and the second light emitting unit 112 is performed by adjusting the body, the green phosphor, the blue phosphor) and the amount thereof.

  On the other hand, the LED chip in the LED element 113a is a red LED chip that emits red light when energized, and has a peak wavelength in the range of, for example, 620 nm to 700 nm. In the LED element 113a, since the red light of the red LED chip is taken out as it is, the sealing member does not contain a phosphor.

  The LED elements 111a, 112a, and 113a configured as described above are mounted on the substrate 130 by, for example, solder connection.

  The current control circuit 120 is configured as an IC package having a plurality of lead terminals, and is mounted on the substrate 130 by, for example, solder connection.

  The substrate 130 is a printed wiring board on which metal wiring (not shown) is formed, and on the surface of the substrate 130, metal wiring having a predetermined pattern is formed. The LED elements 111 a, 112 a and 113 a and the current control circuit 120 are soldered to metal wiring formed on the substrate 130. The LED elements 111a, 112a and 113a and the current control circuit 120 are electrically connected by the metal wiring in the circuit configuration shown in FIG.

  As the substrate 130, for example, a resin substrate made of an insulating resin material, a metal base substrate made of a metal material whose surface is coated with a resin, a ceramic substrate made of a sintered body of a ceramic material, or a glass substrate made of a glass material Can be used. In addition, when the wiring paths of the LED elements 111a, 112a and 113a and the current control circuit 120 are complicated, by using a multilayer substrate as the substrate 130, these electrical connections can be easily made.

  The substrate 130 is not limited to a rigid substrate, and may be a flexible substrate. Further, a resist film may be formed on the surface of the substrate 130 as an insulating film so as to cover the metal wiring.

  In addition, the substrate 130 is provided with a plurality of input terminals 131 electrically connected to the electric wires 30 drawn from the power supply circuit 200. In the present embodiment, the plurality of input terminals 131 are configured by the first input terminal 131a, the second input terminal 131b, and the third input terminal 131c.

  A current (input current) input from the power supply circuit 200 to the light emitting module 100 passes through two of the first input terminal 131a and the second input terminal 131b. On the other hand, the current (output current) output from the light emitting module 100 to the power supply circuit 200 passes through the third input terminal 131c.

  Returning to FIG. 1, the power supply unit 20 includes a housing 21, a circuit board 22 housed in the housing 21, a plurality of circuit elements 23 mounted on the circuit board 22, and an AC power supply 3 (for example, a commercial power supply). And a terminal block 24 for receiving AC power from the The housing 21 is a metal or insulating resin case. The circuit board 22 is a printed wiring board on which metal wiring is formed. The terminal block 24 receives an AC voltage of AC 100 V as an input voltage, for example. The AC voltage received by the terminal block 24 is supplied to the power supply circuit 200.

  The power supply circuit 200 is configured by a plurality of circuit elements 23. The plurality of circuit elements 23 may be, for example, capacitive elements (electrolytic capacitors, ceramic capacitors, etc.), resistive elements (resistors, etc.), rectifier circuit elements, coil elements, transformers, noise filters, diodes, integrated circuit elements (ICs), or Semiconductor elements (FET etc.) and the like.

  The power supply circuit 200 generates power for causing the light emitting module 100 to emit light based on an input voltage from an external power supply, and outputs the generated power to the light emitting module 100. Further, the power supply circuit 200 has a power supply function of generating power for causing the light emitting module 100 to emit light, and also has a light control function of controlling the illumination mode of the light emitting module 100. Specifically, the power supply circuit 200 has a light control function to change the brightness of the illumination light of the light emitting module 100 and a toning function to change the light color of the illumination light of the light emitting module 100 as the illumination control function.

  In the present embodiment, the power supply circuit 200 has a synchro color-adjusting function of interlockingly changing the brightness of the light emitting module 100 and the light color. For example, when the brightness of the light emitting module 100 is increased, the color temperature changes to high light, and when the brightness of the light emitting module 100 is reduced and reduced, the color temperature changes to low light. As a result, it is possible to realize illumination light that changes to a comfortable brightness and light color for people.

  In this case, the synchro color adjustment of the light emitting module 100 can be controlled by the dimmer switch 4. The light adjustment switch 4 is installed, for example, on a wall or the like, and is provided on a wiring path between the AC power supply 3 and the power supply circuit 200 (terminal block 24). The dimmer switch 4 is, for example, a phase control dimmer (two-wire dimmer) that phase-controls an AC voltage. In this case, the phase angle (conduction angle) of the AC voltage supplied from the AC power supply 3 is controlled by the light adjustment switch 4, whereby the input current to the light emitting module 100 is changed. Specifically, the power supply circuit 200 generates an input current according to the AC voltage subjected to the light adjustment control by the light adjustment switch 4. Thus, the light color of the light emitting module 100 can be adjusted by adjusting the brightness of the light emitting module 100 by the light adjustment switch 4. The light adjustment switch 4 includes, for example, an operation unit such as a slider or a knob that can be operated by the user, and the phase angle (conduction angle) is controlled according to the operation of the operation unit by the user.

  In the present embodiment, the power supply circuit 200 is a two-circuit control power supply, and outputs two input powers to the light emitting module 100 as electric power for causing the light emitting unit 110 of the light emitting module 100 to emit light. Specifically, the power supply circuit 200 applies two input powers to the light emitting module 100 having the three light emitting units 110 of the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113. It is outputting. As described above, the number of outputs of power supplied from the power supply circuit 200 to the light emitting module 100 is smaller than the number of the light emitting units 110 (three in the present embodiment). That is, the number of power supply circuits in the power supply circuit 200 is smaller than the number of light emission colors of the light emitting unit 110 (that is, the number of light source colors).

  The two input powers output from the power supply circuit 200 to the light emitting module 100 can be independently controlled by the power supply circuit 200. Specifically, two DC powers independently controlled as drive current for causing the light emitting unit 110 of the light emitting module 100 to emit light are supplied from the power supply circuit 200 to the light emitting module 100 as input current. In the present embodiment, one of the two input currents output from the power supply circuit 200 to the light emitting module 100 is supplied to the first light emitting unit 111, and the other is supplied to the current control circuit 120.

  The power supply unit 20 and the lamp unit 10 are connected by a wire 30. Therefore, DC power generated by the power supply circuit 200 of the power supply unit 20 is supplied to the light emitting module 100 of the lamp unit 10 through the electric wire 30. Specifically, a current corresponding to light adjustment control by the light adjustment switch 4 is generated by the power supply circuit 200, and the generated current is emitted from the power supply circuit 200 via the electric wire 30 as an input current to the light emitting module 100. It is supplied to the module 100. The electric wire 30 is a power line such as a power cable.

  In the present embodiment, since power supply circuit 200 outputs DC power to first light emitting portion 111 and current control circuit 120, electric wire 30 receives an input current input from power supply circuit 200 to light emitting module 100. There are three in total: two power lines and one power line through which an output current output from the light emitting module 100 to the power supply circuit 200 flows.

  Next, the color matching control of the lighting device 1 according to the embodiment will be described using FIGS. 4 to 7E in comparison with the color matching control of the lighting device 1X of the comparative example. FIG. 4 is a diagram showing a circuit configuration of the lighting fixture 1X of the comparative example. FIG. 5: is xy chromaticity diagram which shows the change of the light color of the illumination light by the toning control of the lighting fixture 1 which concerns on embodiment, and the lighting fixture 1X of a comparative example. FIG. 6 is a view showing the relationship between color temperature and brightness in the color adjustment control of the lighting fixture 1 according to the embodiment. Drawing 7A-Drawing 7E are figures showing the flow of current at the time of performing color-adjustment control of lighting installation 1 concerning an embodiment.

  As shown in FIG. 4, the lighting fixture X of Comparative Example 1 includes a light emitting module 100X having a first light emitting unit 111 that emits light with a color temperature of 6200 K and a second light emitting unit 112 that emits light with a color temperature of 2200 K. And a power supply circuit 200. In the lighting device 1X of the comparative example, the light output ratio of the first light emitting unit 111 and the second light emitting unit 112 can be controlled by the power supply circuit 200 to adjust the color of the illumination light of the lighting device 1X.

However, in the lighting fixture 1X of the comparative example, as shown by the broken line in FIG. 5, deer toning on a straight line connecting two points of chromaticity point _{P X5} corresponding to the chromaticity point _{P 1} and 2200K corresponding to 6200K Can not do. In other words, it is not possible to change the color temperature of the illumination light only in chromaticity straight line only connecting two points of chromaticity point P ₁ and the chromaticity point P _X5.

  For this reason, in the lighting device 1 of the comparative example, color shift occurs with the black body locus shown by the curve in FIG. 5, and the color temperature of the illumination light can not be changed to trace the black body locus. It is difficult to reproduce white light satisfying the entire black body locus.

  On the other hand, in the light emitting module 100 of the lighting fixture 1 according to the present embodiment, the first light emitting portion 111 emitting light with a color temperature of 6200 K and the second light emitting portion 112 emitting light with a color temperature of 2200 K In addition, a third light emitting unit 113 that emits red light is provided. Then, two input currents are supplied from the power supply circuit 200 to the light emitting module 100, one of which is supplied to the first light emitting unit 111, and the other is supplied to the current control circuit 120. Furthermore, the current control circuit 120 distributes and supplies the input current to the second light emitting unit 112 and the third light emitting unit 113 according to the amount of current of the other input current.

  Further, in the present embodiment, the light emitting module 100 is controlled by the power supply circuit 200 to perform synchronization control. Specifically, as shown in FIG. 6, the brightness of the light emitting module is controlled to decrease as the color temperature of the light emitting module 100 decreases, and conversely, as the color temperature of the light emitting module 100 increases, the light emitting module Control to increase the brightness of 100.

Specifically, for the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113, the chromaticity points P ₁ , P ₂ , P ₃ , P ₄ , and P ₅ in FIG. A current is supplied so as to have a light output ratio as shown in Table 1 below corresponding to a straight line connecting points, and the color temperature and the brightness of the illumination light of the light emitting module 100 change. The chromaticity points P ₁ , P ₂ , P ₃ , P ₄ , and P ₅ indicate the chromaticity coordinates in the xy chromaticity diagram of FIG. 5.

  Hereinafter, synchro color control in the present embodiment will be described in detail.

First, in the present embodiment, when the color temperature is only the first light emitting portion 111 of 6200K is emitting light at maximum brightness (corresponding to the chromaticity point P ₁ in FIG. 5), the maximum of the light-emitting module 100 The brightness of the In addition, the brightness of the light emitting module at this time is set to 115%. The color temperature of the light emitting module 100 is set to 2700 K when the brightness of the light emitting module 100 is 100%.

When the brightness of the light emitting module 100 is 115% (maximum), only the first input current I _IN1 is output from the power supply circuit 200 to the light emitting module 100 as shown in FIG. 7A. In this case, the first input current I _IN1 supplied to the light emitting module 100 is supplied only to the first light emitting unit 111 as the driving current I _L1 . Accordingly, only the first light emitting unit 111 emits light in the light emitting module 100, and the light emitting module 100 emits illumination light having a color temperature of 6200 K.

  Further, as shown in FIG. 6, when the color temperature of the light emitting module 100 is 2700 K to 6200 K (area A), the brightness of the light emitting module 100 changes in the range of 100% to 115%. Specifically, in this area A, the color adjustment / light control is performed such that the brightness of the light emitting module 100 changes linearly.

In this case, as shown in FIGS. 7B and 7C, two input currents of the first input current I _IN1 and the second input current I _IN2 are output from the power supply circuit 200 to the light emitting module 100.

Among these, the first input current I _IN1 is supplied as the drive current I _L1 only to the first light emitting unit 111, and the first light emitting unit 111 emits light. On the other hand, the second input current I _IN2 is supplied to the current control circuit 120.

At this time, the current control circuit 120, and supplies and distributes a second input current _{I IN2} to the second light emitting portion 112 and the third light emitting portion 113 in accordance with the current amount of the second input current _{I IN2} is present In the embodiment, the current control circuit 120 causes a current to flow preferentially to the light emitting unit 110 having a smaller total amount of forward voltage among the plurality of light emitting units 110 connected to the current control circuit 120.

Therefore, in the case of the color adjustment control in the region A of FIG. 6, as shown in FIG. 7B, the current control circuit 120 reduces the total amount of forward voltage smaller than that of the second light emitting portion 112. The second input current I _IN2 starts to flow only at 113. That is, the second input current I _IN2 is supplied as it is as the drive current I _L3 to only the third light emitting unit 1132, and no current is supplied to the second light emitting unit 112. As a result, the third light emitting unit 113 emits light, and the second light emitting unit 112 does not emit light.

Thereafter, when the ratio of the second input current I _IN2 becomes larger than the first input current I _IN1 , the drive current I _L3 flowing to the third light emitting unit 113 also increases, and the second input current I _IN2 When the maximum current that can be supplied to the third light emitting unit 113 is reached (chromaticity point P ₃ ), as shown in FIG. 7C, the current control circuit 120 causes the second light emitting unit to _generate the second input current I _IN2 . It also diverts to 112. That is, the second input current _{I IN2,} the drive current _{I L3} divided into two parts between the driving current _{I L2} of the second light-emitting portion 112 to the third light emitting portion 113.

As described above, in the case of performing color control at a color temperature of 2700 K to 6200 K (area A), the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113 respectively generate the first input current I. The color of FIG. 5 is controlled according to the light output ratio of the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113, and controlled to emit light independently controlled by _IN1 and the second input current _I.sub.IN2 . It is along a straight line toning control connecting two points of the degree point P ₁ and the chromaticity point P _3. That is, the light emitting module 100 emits illumination light having a color temperature of 6200 K to 2700 K.

  In the case of performing color control at a color temperature of 2700 K to 6200 K (area A), although the second light emitting unit 112 is not made to emit light in this embodiment, the second light emitting unit 112 is also controlled to emit light. You may

  Further, as shown in FIG. 6, when the color temperature of the light emitting module 100 is 2200 K to 2700 K (area B), the brightness of the light emitting module 100 changes in the range of 5% to 100%. Specifically, in this region B, the color adjustment / light control is performed such that the brightness of the light emitting module 100 changes in a curved shape (for example, a quadratic function).

In this case, as shown in FIG. 7C, two input currents of the first input current I _IN1 and the second input current I _IN2 are output from the power supply circuit 200 to the light emitting module 100.

Among these, the first input current I _IN1 is supplied as the drive current I _L1 only to the first light emitting unit 111, and the first light emitting unit 111 emits light. On the other hand, the second input current I _IN2 is supplied to the current control circuit 120. The current control circuit 120, is supplied by distributing the second input current _{I IN2} to the second light emitting portion 112 and the third light emitting portion 113 in accordance with the current amount of the second input current _{I IN2,} the present embodiment Then, the current control circuit 120 preferentially supplies current to the light emitting unit 110 having a smaller total amount of forward voltage among the plurality of light emitting units 110 connected to the current control circuit 120.

Therefore, in the case of the color adjustment control in the region B of FIG. 6, as described above, as shown in FIG. 7C, the current control circuit 120 supplies the drive current _IL2 to the second light emitting unit 112 and supplying a driving current _{I L3} in the light emitting portion 113. In the present embodiment, the chromaticity point from P ₃ toward P _5, as the drive current I _L1 supplied to the first light emitting portion 111 is reduced, it is supplied to the second light emitting portion 112 drive The current I _L2 increases. Then, when the chromaticity point _{P 4,} the drive current _{I L1} supplied to the first light emitting portion 111 becomes zero.

As described above, the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113 respectively receive the first input also in the case of performing color control at color temperatures of 2200 K to 2700 K (area B). The light emission is controlled independently by the current I _IN1 and the second input current I _IN2 according to the light output ratio of the first light emitting part 111, the second light emitting part 112 and the third light emitting part 113, as shown in FIG. of the straight line toning control along a line connecting two points of chromaticity point P ₃ and the chromaticity point P _4. That is, the light emitting module 100 emits illumination light having a color temperature of 2700 K to 2200 K.

  Further, as shown in FIG. 6, when the color temperature of the light emitting module 100 is 1800 K to 2200 K (region C), the brightness of the light emitting module 100 changes in the range of 5% or less. Specifically, in the area C, the color control and the light control are performed such that the brightness of the light emitting module 100 changes in a curved shape.

In this case, as shown in FIG. 7D, the first input current I _IN1 is not output from the power supply circuit 200 to the light emitting module 100, and only the second input current I _IN2 is output. The second input current I _IN2 supplied to the light emitting module 100 is supplied to the current control circuit 120.

At this time, the current control circuit 120, and supplies and distributes a second input current _{I IN2} to the second light emitting portion 112 and the third light emitting portion 113 in accordance with the current amount of the second input current _{I IN2} is present In the embodiment, the current control circuit 120 causes a current to flow preferentially to the light emitting unit 110 having a smaller total amount of forward voltage among the plurality of light emitting units 110 connected to the current control circuit 120.

Therefore, in the case of the color adjustment control in the area C of FIG. 6, as shown in FIG. 7D, the current control circuit 120 supplies the drive current _IL2 to the second light emitting unit 112 in the same manner as described above. 3 supplies a driving current I _L3 to a light-emitting portion 113, so the total amount of the forward voltage is smaller second light-emitting portion 112 third than the light emitting unit 113, supplied to the third light emitting portion 113 The driving current _IL3 is always larger than the driving current _IL2 supplied to the second light emitting unit 112.

In this embodiment, the chromaticity point toward the P ₅ from P _4, the drive current I _L2 is supplied to the second light emitting portion 112 is controlled so as to gradually decrease. Then, when the chromaticity point _{P 5,} the driving current _{I L2} is supplied to the second light emitting portion 112 becomes zero, the drive current _{I L3} is supplied only to the third light emitting portion 113.

As described above, in the case of performing color control at a color temperature of 1800 K to 2200 K (area C), the first light emitting unit 111 does not emit light, and only the second light emitting unit 112 and the third light emitting unit 113 It is independently controlled to emit light by the second input current I _IN2, in response to the light output ratio of the second light-emitting portion 112 and the third light emitting portion 113, the chromaticity point P ₄ and the chromaticity point P ₅ Toning control is performed along a straight line connecting two points. That is, the light emitting module 100 emits illumination light having a color temperature of 2200 K to 1800 K.

  Further, as shown in FIG. 6, when the color temperature of the light emitting module 100 is 1800 K, the brightness of the light emitting module 100 is 1%. At this time, the brightness of the light emitting module 100 is minimized.

In this case, as shown in FIG. 7E, the first input current I _IN1 is not output from the power supply circuit 200 to the light emitting module 100, and only the second input current I _IN2 is output. The second input current I _IN2 supplied to the light emitting module 100 is supplied to the current control circuit 120. The current control circuit 120, and supplies and distributes a second input current _{I IN2} to the second light emitting portion 112 and the third light emitting portion 113 in accordance with the current amount of the second input current _{I IN2} is minimum in FIG. 6 When performing color control with brightness (1%), all of the second input current I _IN2 is supplied only to the third light emitting unit 113 as the drive current I _L3 . Accordingly, only the third light emitting unit 113 emits light in the light emitting module 100, and the light emitting module 100 emits red light with a color temperature of 1800K.

As described above, in the lighting apparatus 1 according to the present embodiment, as shown by the solid line in FIG. 5, when performing color control from high color temperature to low color temperature, the chromaticity points P ₃ to P ₅ are relative The amount of current flowing to the third light emitting unit 113 is gradually increased. Thereby, in the lighting fixture 1X of Comparative Example 1, the chromaticity point at a color temperature of 2200 K was P _X5 , but in the lighting fixture 1 in the present embodiment, the chromaticity point at a color temperature of 2200 K is P ₄ it can be, color temperature can move the chromaticity point of 2200K from _{P X5} to _{P 4.} Therefore, the chromaticity of the illumination light of the lighting fixture 1 can be set to a target chromaticity close to the black body locus. That is, the third light emitting unit 113 can shift the color deviation (Duv) of the illumination light of the lighting device 1 (light emitting module 100) on the low color temperature side to the negative side. Thereby, the color temperature of the illumination light on the low color temperature side can be made close to the black body locus. As a result, it is possible to reproduce white light satisfying the entire black body locus.

Moreover, in the lighting apparatus 1 according to the present embodiment, the current control circuit 120 provided in the light emitting module 100 causes the current according to the amount of the second input current I _IN2 supplied from the power supply circuit 200 to the current control circuit 120. The second input current I _IN2 is distributed and supplied to the second light emitting unit 112 and the third light emitting unit 113 with the output ratio. Thereby, while using the three light emitting units 110 of the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113, the number of input currents that can be independently controlled by the power supply circuit 200 (output Even if the number is two, which is smaller than the number of light emitting units 110, it is possible to change the color temperature of the illumination light so as to trace the black body locus. That is, using the existing two-circuit control power supply having a low cost and a simple configuration as the power supply circuit 200, it is possible to perform the color adjustment control of the light emitting module 100 having the three light emitting units 110 having different light colors.

  Therefore, according to the lighting fixture 1 in the present embodiment, color reproduction can be performed with a light color close to the black body locus using the low-cost power supply circuit 200.

  Furthermore, in the lighting fixture 1 according to the present embodiment, the brightness of the light emitting module 100 when only the third light emitting unit 113 emits light among the plurality of light emitting units 110 is 5% or less. Specifically, the brightness of the light emitting module 100 when only the third light emitting unit 113 emits light is 1%.

As described above, in the present embodiment, in order to emit light with low color temperature and brightness and atmosphere in the process of the synchro toning, area C in FIG. 6 (a low color temperature area having a color temperature of 2200 K or less In the above, red light of low luminous flux is emitted by supplying only the second input current I _IN2 to the third light emitting unit 113 by the complementary color circuit and lighting only the third light emitting unit 113. As a result, it is possible to achieve the color tone in the low color temperature region in a natural manner while performing the synchro color adjustment using the low cost power supply circuit 200 to change the light color. In addition, since the brightness of the light emitting module 100 when only the third light emitting portion 113 emits light is 5% or less, it is possible to realize light having an atmosphere unique to a miniature light bulb.

  In particular, in the present embodiment, since the third light emitting unit 113 is disposed at the central portion of the substrate 130, it is possible to realize the light of the atmosphere more like a miniature light bulb.

(Modification)
As mentioned above, although the lighting fixture which concerns on this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment.

  For example, in the first to third embodiments, light adjustment control of a plurality of light emitting units is performed by phase light adjustment (two-wire type), but the light adjustment control method is not limited to this, and PWM light adjustment Dimming control of a plurality of light emitting units may be performed by (four-wire type) or 0-10 VDC dimming.

  Moreover, in the said embodiment, although the LED element which comprises the light emission part 110 was made into SMD type, and the light emitting module 100 was made into SMD type, it does not restrict to this. For example, a COB (Chip On Board) type light emitting module in which LED chips (bare chips) are directly mounted on a substrate may be used. For example, as in the light emitting module 101 shown in FIG. 8, the first light emitting unit 111, the second light emitting unit 112, and the third light emitting unit 113, a plurality of LED chips mounted on the substrate 130, and the LED chips And a sealing member for sealing the In this case, the first light emitting unit 111 and the second light emitting unit 112 use a blue LED chip as the LED chip, and a phosphor containing one or more phosphors such as a yellow phosphor as the sealing member. Use containing resin. On the other hand, in the third light emitting unit 113, a red LED chip is used as the LED chip, and a transparent resin containing no phosphor is used as the sealing member. Also in the second and third embodiments, a COB type light emitting module may be applied.

  Moreover, in the said embodiment, although the number of the light emission parts provided in the light emitting module was three, it does not restrict to this. For example, the light emitting module may be provided with three or more light emitting units. Also in this case, by setting the number of outputs of power supplied from the power supply circuit to the light emitting module smaller than the number of light emitting units, the power supply circuit is more than when using power circuits with the same number of power outputs as the number of light emitting units. Cost can be reduced.

  Further, in the above-described embodiment, the color adjustment control of the light emitting module is performed using the light adjustment switch 4 connected to the power supply unit through the electric wire, but the present invention is not limited thereto. For example, by incorporating the wireless module in the power supply unit, the color adjustment control of the light emitting module may be performed by transmitting the light adjustment / color adjustment signal from the wireless terminal to the wireless module.

  Further, in the above-described embodiment, in the case of performing toning control, synchro toning in which toning and dimming are interlocked is performed, but the present invention is not limited to this. For example, toning control may be performed such that only the light color is changed without changing the brightness.

  Moreover, although the downlight was illustrated in the said embodiment, this invention is applicable also to other lighting fixtures, such as a spotlight or a base light.

  In addition, the present invention can be realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention or the embodiments obtained by applying various modifications that those skilled in the art would think to the above embodiments. The embodiments of the present invention are also included in the present invention.

Reference Signs List 1 lighting fixture 100, 101 light emitting module 110 light emitting unit 111 first light emitting unit 112 second light emitting unit 113 third light emitting unit 120 current control circuit 130 substrate 200 power circuit

Claims (7)

A light emitting module having a plurality of light emitting units having different light colors of emitted light;
A power supply circuit that outputs power for causing the light emitting module to emit light to the light emitting module;
The plurality of light emitting units emit light from a first light emitting unit, a second light emitting unit that emits light having a color temperature lower than a color temperature of light emitted from the first light emitting unit, and the second light emitting unit And a third light emitting unit that emits light having a color temperature lower than the color temperature of the light;
The number of outputs of power supplied from the power supply circuit to the light emitting module is smaller than the number of the plurality of light emitting units,
The brightness of the light emitting module when only the third light emitting unit emits light among the plurality of light emitting units is 5% or less.
lighting equipment. And a current control circuit for supplying current to the second light emitting unit and the third light emitting unit.
The current control circuit supplies a current to the second light emitting unit and the third light emitting unit based on a current output ratio corresponding to the amount of current supplied from the power supply circuit to the current control circuit.
The lighting fixture according to claim 1. The current control circuit is provided in the light emitting module.
The lighting fixture according to claim 2. The light color of the third light emitting unit is red or amber.
The lighting fixture of any one of Claims 1-3. The light emitting module has a substrate,
The third light emitting unit is disposed at a central portion of the substrate.
The lighting fixture of any one of Claims 1-4. The second light emitting unit is divided into a plurality of parts,
The third light emitting unit is disposed between one of the plurality of second light emitting units and the other.
The lighting fixture according to claim 5. The first light emitting unit is disposed between the second light emitting unit and the third light emitting unit.
The lighting fixture of Claim 6.

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