TW201839308A - Lighting device capable of utilizing a low-cost power source circuit to reproduce colors with a light color close to the black body locus - Google Patents

Abstract

This invention provides a lighting device, which is able to utilize a low-cost power source circuit to reproduce colors with a light color close to the black body locus. The lighting device of the present invention includes: a light emitting module 100, provided with a plurality of light emitting parts 110 capable of emitting lights with different light colors; and a power source circuit 200, used for outputting electric power to the light emitting module 100 for enabling the light emitting parts 110 to light lights; the plural light emitting parts 110 are provided with: a first light emitting part 111; a second light emitting part 112 capable of emitting lights with a lower color temperature than the color temperature of the lights emitted by the first light emitting part 111; and a third light emitting part 113 capable of emitting lights with a lower color temperature than the color temperature of the lights emitted by the second light emitting part 112; the amount of output circuits of the power source circuit 200 for supplying electric power to the light emitting module 100 is less than the quantity of the plural light emitting parts 110; when only the third light emitting part 113 of the plural light emitting parts 110 is served to emit lights, the brightness of the light emitting module 100 is less than 5%.

Description

Lighting appliances

The invention relates to a lighting appliance.

Conventionally, there has been known a lighting fixture having a function (a so-called toning function) that can change the light color of the illumination light in accordance with the purpose of use, the use situation, and the like (for example, refer to Patent Document 1).

A conventional lighting device having a color-grading function includes, for example, a light-emitting module having two light-emitting portions whose light colors are different from each other; and a power supply circuit which can independently control the light output of the two light-emitting portions of the light-emitting module. These luminaires are capable of toning the illuminating light by controlling the light output ratio of the two light emitting sections by the power supply circuit. [Habitual technical literature] [patent literature]

Patent Document 1: Japanese Patent Application Laid-Open No. 2009-110781

[Problems to be Solved by the Invention]

However, if two light emitting sections having different light colors are used for color adjustment of the illumination light, color adjustment can be performed only on a straight line connecting the two chromaticity points on the chromaticity diagram. For example, when the light emitting colors of the two light-emitting parts are natural white and incandescent, only a straight line connecting the two points of the chromaticity point representing natural white and the chromaticity point of incandescent lamp color on the chromaticity diagram can be used. The chromaticity changes the color of the illumination light.

Therefore, the coloring performed by the two light-emitting parts with different light colors produces a color shift between the black body locus and the light color of the illumination light cannot be changed by tracking the black body locus, and it is difficult to reproduce the white that satisfies the full range of the black body locus. Light.

Therefore, it is also considered to use three light emitting sections with different light colors for coloring of the illumination light. However, if the light output of the three light emitting sections is independently controlled by the power supply circuit, the power supply circuit becomes complicated and the cost of the power supply circuit becomes high.

The present invention has been made in order to solve these problems, and an object thereof is 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. [Technical means to solve the problem]

In order to achieve the above object, one aspect of the lighting fixture of the present invention includes: a light emitting module having a plurality of light emitting sections whose light colors of emitted light are different from each other; and a power supply circuit for outputting to the light emitting module for making the The light-emitting module emits electric power; the plurality of light-emitting sections include: a first light-emitting section; a second light-emitting section that emits light having a lower color temperature than a color temperature of light emitted by the first light-emitting section; and a third light-emitting section, The light emitting light having a color temperature lower than that of the light emitted by the second light-emitting portion; the number of output strands of the electric power supplied from the power circuit to the light-emitting module is smaller than the number of the plurality of light-emitting portions; The brightness of the light emitting module when only the third light emitting portion emits light among the light emitting portions is 5% or less. [Effect of the present invention]

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

Hereinafter, embodiments of the present invention will be described. In addition, the embodiments described below all show a preferred specific example of the present invention. Therefore, the numerical values, shapes, materials, constituent elements, and arrangement positions and connection forms of the constituent elements shown in the following embodiments are all examples, and the intention is not to limit the present invention. Therefore, among the constituent elements of the following embodiments, those which are not described in the independent claim item showing the highest-level concept of the present invention will be described as arbitrary constituent elements.

In addition, each drawing is a schematic diagram, and is not strictly illustrated. Therefore, the scales and the like in the drawings need not necessarily be the same. In each drawing, the same reference numerals are given to substantially the same components, and repeated description is omitted or simplified.

(Embodiment) First, the configuration of a lighting fixture 1 according to an embodiment will be described with reference to Figs. 1 to 3. FIG. 1 is a schematic diagram of an installation example of the lighting fixture 1 according to the embodiment. FIG. 2 is a diagram showing a circuit configuration of the lighting device 1. FIG. 3 is a diagram showing a configuration of a light emitting module 100 of the same lighting fixture 1.

As shown in FIG. 1, the lighting fixture 1 according to this embodiment is a downlight that radiates illumination light downward (floor, etc.) and is installed on a ceiling 2 of a building. For example, the lighting fixture 1 is installed by being fitted to the ceiling 2.

As shown in FIG. 1, the lighting fixture 1 includes a lamp unit 10 having a light emitting module 100 and a power unit 20 having a power circuit 200. For example, the lamp unit 10 is arranged by being fitted into the opening 2 a of the ceiling 2, and the power supply unit 20 is arranged on the rear surface (inner ceiling surface) of the ceiling 2. The opening 2 a of the ceiling 2 is a mounting hole for mounting the lamp unit 10 on the ceiling 2, and is, for example, a through hole penetrating a circular opening of the ceiling 2.

The lamp unit 10 includes, for example, a base 11 and a frame 12 fixed in front of the base 11. The light emitting module 100 is mounted on the base 11. The base 11 is made of, for example, a metal material such as aluminum, and functions not only as a mounting portion of the light-emitting module 100 but also as a heat-radiating portion that dissipates heat generated in the light-emitting module 100. The frame body 12 is attached to the opening 2 a of the ceiling 2 by a leaf 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 this embodiment, the light-emitting module 100 is an LED module, and the light-emitting portion 110, which is a light source, is composed of LEDs.

The light-emitting module 100 includes a plurality of light-emitting portions 110 that emit light colors different from each other. The number of the plurality of light emitting sections 110 is three or more. In this embodiment, the light-emitting module 100 is composed of the following three light-emitting portions 110: a first light-emitting portion 111 that emits light of a first color temperature; a second light-emitting portion 112 that emits light that is greater than that emitted by the first light-emitting portion 111 The lower color temperature of the light (the first color temperature) is the light of the second color temperature; and the third light emitting section 113 emits a lower color temperature than the color temperature (the second color temperature) of the light emitted by the second light emitting section 112. That is, the light of the third color temperature.

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

The first light emitting section 111 is composed of a plurality of LED elements 111a (first LED elements) connected in series. Specifically, the first light emitting section 111 is a series connection 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 the LED elements 111 a constituting the first light-emitting portion 111 is not limited to six, and may be one or plural other than six.

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

The third light emitting section 113 is composed of a plurality of LED elements 113a (third LED elements) connected in series. Specifically, the third light emitting section 113 is a series connection 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 the LED elements 113a constituting the third light-emitting portion 113 is not limited to two, and may be one or plural other than two.

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

In addition, if the total forward voltage of a plurality of LED elements connected in series in each light emitting section 110 is the total Vf (total Vf), in this embodiment, the value of the total Vf of the element rows of each light emitting section 110, It depends on the number of LED elements of each light emitting section 110. Therefore, if the total Vf of the first light-emitting portion 111 composed of six LED elements 111a is TVf1, the total Vf of the second light-emitting portion 112 composed of five LED elements 112a is TVf2, and two LED elements 113a If the total Vf of the third light-emitting section 113 is TVf3, TVf1> TVf2> TVf3.

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

The current control circuit 120 is based on a current output ratio that depends on the amount of current supplied from the power supply circuit 200 to the current control circuit 120. Among the plurality of light-emitting sections 110 of the light-emitting module 100, the plurality of light-emitting sections are connected to the current control circuit 120. 110 supply current. The current control circuit 120 includes a current detection circuit that detects the amount of current supplied from the power supply circuit 200 to the current control circuit 120.

In this embodiment, the current control circuit 120 is connected to the second light-emitting section 112 and the third light-emitting section 113, and distributes and supplies the input current supplied to the current control circuit 120 to the second light-emitting section 112 and the third light-emitting section 113. In this case, the current control circuit 120 detects the current amount (current value) of the input current input from the power supply circuit 200 to the current control circuit 120. Then, according to the detected current amount, a current output ratio (distribution ratio) for the input current distributed to the second light-emitting section 112 and the third light-emitting section 113 is determined, and the current control circuit 120 is based on the current output ratio. The amount of current divides the current to the second light emitting section 112 and the third light emitting section 113.

In addition, when the current control circuit 120 shunts current to the plurality of light emitting units 110 connected to the current control circuit 120, the current control circuit 120 preferentially reduces the total amount of forward voltages in the plurality of light emitting units 110 connected to the current control circuit 120. The light emitting section 110 circulates. Therefore, the current control circuit 120 causes the current to flow from the light emitting section 110 with a small total forward voltage. If the amount of current supplied from the power supply circuit 200 to the current control circuit 120 gradually increases, the current is also passed to the other light emitting sections 110. Diversion.

In the present embodiment, the second light emitting section 112 and the third light emitting section 113 are connected to the current control circuit 120, and the total amount of forward voltage of the third light emitting section 113 is smaller than that of the second light emitting section 112. Therefore, the current control circuit 120 first causes the current to flow only to the third light-emitting portion 113 whose total forward voltage is smaller than that of the second light-emitting portion 112. As the current supplied from the power supply circuit 200 to the current control circuit 120 starts, When the amount is increased, the amount of current shunted to the third light-emitting portion 113 is increased. Then, if the amount of current supplied from the power supply circuit 200 to the current control circuit 120 further increases and the current flowing through the third light emitting section 113 becomes the largest, the current control circuit 120 also causes the current to start flowing to the second light emitting section 112. The amount of current shunted to the second light emitting section 112 is increased.

The light-emitting module 100 configured as described above has, for example, a structure shown in FIG. 3. Specifically, the light-emitting module 100 includes a substrate 130, a plurality of light-emitting sections 110 (the first light-emitting section 111, the second light-emitting section 112, and the third light-emitting section 113) and the current control circuit 120 are provided on the substrate 130.

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

In addition, the second light-emitting section 112 is divided into a plurality of pieces; and the third light-emitting section 113 is arranged between one of the plurality of second light-emitting sections 112 and the other. Specifically, the LED element 112a constituting the second light-emitting portion 112 is arranged in two areas via the third light-emitting portion (LED element 113a); the LED element 113a constituting the third light-emitting portion 113 is disposed on one side The LED element 112a in one domain and the LED element 112a arranged in the other domain.

The first light emitting section 111 is disposed between the second light emitting section 112 and the third light emitting section 113. Specifically, the LED element 111 a constituting the first light emitting section 111 is disposed between the LED element 112 a constituting the second light emitting section 112 and the LED element 113 a constituting the third light emitting section 113.

By arranging the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113 in this manner, it is possible to emit the light from the first, second, and third light-emitting portions 111, 112, and 113, respectively. Light blends evenly. In particular, when the first light-emitting section 111, the second light-emitting section 112, and the third light-emitting section 113 are subjected to synchronous color control as described later, the first light-emitting section 111, the second light-emitting section 112, and the third light-emitting section are controlled. The unit 113 causes one or more of them to emit light, but can uniformly mix colors at any brightness.

In this embodiment, the LED element 111a constituting the first light-emitting portion 111, the LED element 112a constituting the second light-emitting portion 112, and the LED element 113a constituting the third light-emitting portion 113 are individually packaged surface mount (SMD: Surface Mount Device) type LED element.

Specifically, the LED elements 111a, 112a, and 113a each include: a white resin package (container) having a concave portion; and one or more LED chips (bare wafers) mounted on the bottom surface of the concave portion of the package at one time; And the sealing member is sealed in the recess of the package. The sealing member is made of a translucent resin material such as a silicone resin.

The LED chip is an example of a semiconductor light emitting device that emits light with a predetermined DC power, and is a bare chip that emits monochromatic visible light. In this case, the LED chips of the LED elements 111a and 112a are, for example, blue LED chips that emit blue light when energized, and have peak wavelengths in a range of 440 nm to 470 nm, for example. In order to obtain white light, the LED elements 111a and 112a contain yellow phosphors such as YAG (yttrium aluminum garnet) in the sealing member, and emit blue light using blue light from the blue LED chip as excitation light. 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. The yellow light and the blue that the yellow phosphor does not absorb are blue. The colored lights are mixed to produce white light.

However, the first light emitting section 111 emits light having a higher color temperature than that of the light emitted from the second light emitting section 112. Therefore, in order to make the color temperature of the light emitted from the first light-emitting portion 111 higher than the color temperature of the light emitted from the second light-emitting portion 112, the type of the phosphor (for example, red phosphor, red phosphor, Green phosphor, blue phosphor) and the amount, and adjust the chromaticity of the first light emitting section 111 and the second light emitting section 112.

On the other hand, the LED chip of the LED element 113a is a red LED chip that emits red light when energized, and has a peak wavelength in a range of 620 nm to 700 nm, for example. The LED element 113a directly takes out the red light from the red LED chip, and therefore does not include a phosphor in the sealing member.

The LED elements 111a, 112a, and 113a thus configured are mounted on the substrate 130 by, for example, soldering.

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 soldering, for example.

The substrate 130 is a printed wiring substrate on which metal wirings (not shown) are formed, and metal wirings having a predetermined pattern are formed on the surface of the substrate 130. The LED elements 111a, 112a, and 113a and the current control circuit 120 are soldered to a metal wiring formed on the substrate 130. The LED elements 111a, 112a, and 113a are electrically connected to the current control circuit 120 through the metal wiring, as shown in FIG. 2.

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 covered with a resin film, a ceramic substrate made of a sintered body of a ceramic material, or a glass substrate made of a glass material can be used. Wait. In addition, when the wiring paths of the LED elements 111a, 112a, and 113a and the current control circuit 120 become complicated, by using a multi-layer substrate as the substrate 130, the electrical connection can be easily performed.

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

In addition, a plurality of input terminals 131 are provided on the substrate 130 and are electrically connected to the electric wires 30 led out from the power circuit 200. In the present embodiment, the plurality of input terminals 131 are composed of a first input terminal 131a, a second input terminal 131b, and a third input terminal 131c.

The current (input current) input from the power supply circuit 200 to the light-emitting module 100 passes through two first input terminals 131a and second input terminals 131b. On the other hand, a 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 stored in the housing 21; a plurality of circuit elements 23 mounted on the circuit board 22; and a terminal block 24 that receives power from an AC power source 3 (for example, a commercial unit). Power). The casing 21 is a case made of metal or insulating resin. The circuit board 22 is a printed wiring board on which metal wiring is formed. The terminal block 24 receives, for example, an AC voltage of 100 V AC as an input voltage. The AC voltage received by the terminal block 24 is supplied to the power supply circuit 200.

The power supply circuit 200 includes a plurality of circuit elements 23. The plurality of circuit elements 23 are, 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 ( IC), or semiconductor elements (such as FETs).

The power circuit 200 generates electric power for causing the light emitting module 100 to emit light according to an input voltage from an external power source, and outputs the generated electric power to the light emitting module 100. In addition, the power supply circuit 200 has a power supply function for generating electric power for causing the light emitting module 100 to emit light, and a lighting control function for controlling the lighting state of the light emitting module 100. Specifically, the power supply circuit 200, as a lighting control function, has a dimming function that changes the brightness of the illumination light of the light emitting module 100, and a color tone function that changes the light color of the illumination light of the light emitting module 100.

In this embodiment, the power supply circuit 200 has a synchronous color adjustment function, which changes the brightness and light color of the light-emitting module 100 in tandem. For example, if the brightness of the light-emitting module 100 increases, it changes to light with a high color temperature, and if the brightness limit of the light-emitting module 100 decreases, it changes to light with a low color temperature. Thereby, it is possible to realize illumination light which is changed to a pleasant brightness and light color to a person.

In this case, the synchronous color adjustment of the light emitting module 100 can be controlled by the dimming switch 4. The dimmer switch 4 is provided, for example, on a wall surface 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-controlled dimmer (two-wire dimmer) that controls the phase of the AC voltage. In this case, the phase current (conduction angle) of the AC voltage supplied from the AC power source 3 is controlled by the dimmer switch 4 to change the input current to the light emitting module 100. Specifically, the power supply circuit 200 generates an input current that depends on the AC voltage controlled by the dimming switch 4. In this way, the brightness of the light-emitting module 100 can be adjusted by the dimmer switch 4, and the light color of the light-emitting module 100 can also be adjusted. The dimmer switch 4 includes, for example, an operation part such as a slider or a knob that a user can operate, and controls the phase angle (conduction angle) in accordance with the operation of the operation part performed by the user.

In this embodiment, the power supply circuit 200 is a dual-circuit control power supply, and outputs two input powers to the light-emitting module 100 as power for causing the light-emitting portion 110 of the light-emitting module 100 to emit light. Specifically, the power supply circuit 200 outputs two input powers to a light emitting module 100 including three light emitting units 110 including a first light emitting unit 111, a second light emitting unit 112, and a third light emitting unit 113. In this way, the number of output powers of the electric power supplied from the power supply circuit 200 to the light emitting module 100 is smaller than the number of light emitting units 110 (three in the present embodiment). That is, the number of power supply circuits of the power supply circuit 200 is smaller than the number of light emitting colors (that is, the number of light source colors) of the light emitting portion 110.

The two input powers output from the power circuit 200 to the light emitting module 100 can be independently controlled by the power circuit 200. Specifically, from the power supply circuit 200, two pieces of DC power, which are independently controlled as a driving current for causing the light emitting section 110 of the light emitting module 100 to emit light, are supplied to the light emitting module 100 as an input current. In this 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 section 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, the 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, the power supply circuit 200 generates a current that responds to the dimming control performed by the dimmer switch 4, uses the generated current as an input current to the light emitting module 100, and supplies the light emitting module 100 from the power circuit 200 via the electric wire 30. . The electric wire 30 is a power line such as a power line.

In this embodiment, the power supply circuit 200 outputs DC power to the first light emitting section 111 and the current control circuit 120. Therefore, the electric wire 30 is a total of three power lines as follows: The input current from the power supply circuit 200 to the light emitting module 100 flows 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 control of the lighting fixture 1 according to the embodiment and the color control of the lighting fixture 1X of the comparative example will be described using FIGS. 4 to 7E. FIG. 4 is a diagram showing a circuit configuration of a lighting fixture 1X of a comparative example. FIG. 5 is an xy chromaticity diagram showing a change in the light color of the illuminating light generated by the color control of the luminaire 1 of the embodiment and the luminaire 1X of the comparative example. FIG. 6 is a diagram showing the relationship between the color temperature and the brightness in the color control of the lighting fixture 1 according to the embodiment. 7A to 7E are diagrams showing the flow of current when the color control of the lighting fixture 1 according to the embodiment is performed.

As shown in FIG. 4, the lighting device 1X of Comparative Example 1 includes a light-emitting module 100X having a first light-emitting portion 111 that emits light having a color temperature of 6200K and a second light-emitting portion 112 that emits light having a color temperature of 2200K; and a power supply; Circuit 200. The luminaire 1X of the comparative example is capable of toning the illuminating light of the luminaire 1X by controlling the light output ratio of the first light-emitting portion 111 and the second light-emitting portion 112 by the power supply circuit 200.

However, the lighting device 1X of the comparative example, as shown by the dotted line in FIG. 5, can only be graded on a straight line connecting the two points of chromaticity point P ₁ corresponding to 6200K and the chromaticity point P _X5 corresponding to 2200K. . That is, the color temperature of the illumination light can be changed only by the chromaticity on a straight line connecting the two points of the chromaticity point P ₁ and the chromaticity point P _X5 .

Therefore, a color deviation occurs between the lighting fixture 1 of the comparative example and the black body locus indicated by the curve in FIG. 5, and the color temperature of the illumination light cannot be changed by tracking the black body locus, and it is difficult to reproduce white light that satisfies the full range of the black body locus.

On the other hand, in the light-emitting module 100 of the luminaire 1 according to this embodiment, in addition to the first light-emitting portion 111 that emits light with a color temperature of 6200K and the second light-emitting portion 112 that emits light with a color temperature of 2200K, a light-emitting module 100 The third light-emitting portion 113 of red light. Then, two input currents are supplied from the power supply circuit 200 to the light emitting module 100, one of them is supplied to the first light emitting section 111, and the other is supplied to the current control circuit 120. Further, the current control circuit 120 distributes and supplies the input current to the second light emitting section 112 and the third light emitting section 113 in accordance with the current amount of the other input current.

In addition, in the present embodiment, the light-emitting module 100 is synchronized with the color control by the power supply circuit 200. 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 becomes lower. On the contrary, the light-emitting mode is controlled to be controlled as the color temperature of the light-emitting module 100 becomes higher The brightness of the group 100 becomes larger.

Specifically, the first light emitting portion 111, the second light-emitting portion 112, current is supplied to the third light emitting portion 113, so that the chromaticity of FIG point _{P 1 5, P 2, P} 3, P 4, P 5 The straight lines connecting the points correspond to the light output ratio shown in Table 1 below, and the color temperature and brightness of the illumination light of the light emitting module 100 are changed. The chromaticity points P ₁ , P ₂ , P ₃ , P ₄ , and P ₅ represent the chromaticity coordinates of the xy chromaticity diagram in FIG. 5.

【Table 1】

Hereinafter, the synchronous toning control of this embodiment will be described in detail.

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

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

In addition, as shown in FIG. 6, when the color temperature of the light-emitting module 100 is 2700K to 6200K (area A), the brightness of the light-emitting module 100 changes within a range of 100% to 115%. Specifically, in this area A, the toning and dimming 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, the power supply circuit 200 outputs the two input currents of the first input current I _IN1 and the second input current I _IN2 to the light emitting module 100.

Among them, the first input current I _{IN1 is} supplied as the drive current I _L1 only to the first light-emitting portion 111 and causes the first light-emitting portion 111 to emit 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, in accordance with the second amount of current to the input current I _IN2, the second input current I _IN2 is supplied to the third light-emitting unit 113 assigned second light emitting portion 112 and the second, in the present embodiment, the current control circuit 120, the current is preferentially caused to flow to the light emitting section 110 having a small total amount of forward voltage among the plurality of light emitting sections 110 connected to the current control circuit 120.

Therefore, in the case of the color control in the area A of FIG. 6, as shown in FIG. 7B, the current control circuit 120 makes the total amount of the second input current I _{IN2 forward} only smaller than that of the second light-emitting portion 112. The third light emitting section 113 starts to circulate. That is, the second input current I _{IN2 is} directly supplied as the driving current I _L3 only to the third light emitting section 113, and no current is supplied to the second light emitting section 112. This causes the third light-emitting portion 113 to emit light, and the second light-emitting portion 112 does not emit light.

Thereafter, if the ratio of the second input current I _IN2 gradually becomes larger than the first input current I _IN1 , the driving current I _L3 flowing through the third light emitting section 113 also gradually increases. If the second input current I _IN2 reaches As shown in FIG. 7C, the maximum current (chrominance point P ₃ ) flowing through the third light-emitting portion 113 also shunts the second input current I _IN2 to the second light-emitting portion 112. That is, the second input current I _IN2, is split into a driving current 112 of the second light emitting portion I _L2, I _L3 and the drive current to the light emitting portion 113 of the third.

In this way, when the color tone control is performed at a color temperature of 2700K to 6200K (area A), the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113 respectively use the first input current I _IN1 and The second input current I _{IN2 is} controlled to emit light independently, and the chromaticity point P ₁ and the chromaticity point of FIG. 5 are determined along the light emission ratios of the first light emitting section 111, the second light emitting section 112, and the third light emitting section 113. P _{3 is} a straight line connecting these two points for color control. That is, the light emitting module 100 emits illumination light having a color temperature of 6200K to 2700K.

When the color control is performed at a color temperature of 2700K to 6200K (area A), in this embodiment, although the second light-emitting portion 112 is not caused to emit light, the second light-emitting portion 112 may also be controlled to emit light.

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

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

Among them, the first input current I _{IN1 is} supplied as the drive current I _L1 only to the first light-emitting portion 111 and causes the first light-emitting portion 111 to emit light. On the other hand, the second input current I _{IN2 is} supplied to the current control circuit 120. A current control circuit 120, in accordance with the second amount of current to the input current I _IN2, the second input current I _IN2 is supplied to the third light-emitting unit 113 assigned second light emitting portion 112 and the second, in the present embodiment, the current control circuit 120, so that The current flows preferentially to the light emitting section 110 having a small total amount of forward voltage among the plurality of light emitting sections 110 connected to the current control circuit 120.

Therefore, in the case of the toning control in the area B of FIG. 6, similar to the above, as shown in FIG. 7C, the current control circuit 120 supplies the driving current I _L2 to the second light emitting section 112 and also to the third light emitting section. 113 Supply a driving current I _L3 . In this embodiment, at the chromaticity point P ₃ to P ₅ , as the driving current I _L1 supplied to the first light-emitting portion 111 becomes smaller, the driving current I _L2 supplied to the second light-emitting portion 112 becomes larger. Then, at the chromaticity point P ₄ , the driving current I _L1 supplied to the first light emitting section 111 becomes zero.

In this way, in the case where the color tone control is performed at a color temperature of 2200K to 2700K (area B), the first light-emitting portion 111, the second light-emitting portion 112, and the third light-emitting portion 113 are also respectively subjected to the first input current I _IN1 and the second input current I _{IN2 are} independently controlled to emit light, and according to the light output ratios of the first light emitting section 111, the second light emitting section 112, and the third light emitting section 113, the chromaticity point P ₃ and the color in FIG. The degree point P ₄ is toned on a straight line connecting the two points. That is, the light emitting module 100 emits illumination light having a color temperature of 2700K to 2200K.

In addition, as shown in FIG. 6, when the color temperature of the light-emitting module 100 is 1800 K to 2200 K (area C), the brightness of the light-emitting module 100 changes within a range of 5% or less. Specifically, in this area C, the toning and dimming control is performed so that the brightness of the light emitting module 100 is changed in a curved shape.

In this case, as shown in FIG. 7D, from the power supply circuit 200, the first input current I _{IN1 is} not output to the light emitting module 100, but 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, in accordance with the second amount of current to the input current I _IN2, the second input current I _IN2 is supplied to the third light-emitting unit 113 assigned second light emitting portion 112 and the second, in the present embodiment, the current control circuit 120, the current is preferentially caused to flow to the light emitting section 110 having a small total amount of forward voltage among the plurality of light emitting sections 110 connected to the current control circuit 120.

Therefore, in the case of the color control in the area C of FIG. 6, as shown in FIG. 7D, the current control circuit 120 supplies the driving current I _L2 to the second light-emitting portion 112 and also to the third light-emitting portion, as described above. 113 supplies the driving current I _L3 , but the total forward voltage of the third light-emitting portion 113 is smaller than that of the second light-emitting portion 112. Therefore, the driving current I _L3 supplied to the third light-emitting portion 113 is smaller than that of the first light-emitting portion 113. The driving current I _L2 supplied from the two light emitting sections 112 is also always large.

In this embodiment, when the chromaticity point is P ₄ to P ₅ , control is performed to gradually reduce the driving current I _L2 supplied to the second light emitting section 112. Then, at the chromaticity point P ₅ , the driving current I _L2 supplied to the second light emitting section 112 becomes zero, and only the driving current I _{L3 is} supplied to the third light emitting section 113.

In this way, in the case where the color control is performed at a color temperature of 1800K to 2200K (area C), the first light emitting section 111 does not emit light, and only the second light emitting section 112 and the third light emitting section 113 use the second input current I _IN2 controls light emission independently, and performs toning control along a straight line connecting the two points of chromaticity point P ₄ and chromaticity point P _{5 in} accordance with the light emission ratios of second light emitting section 112 and third light emitting section 113. That is, the light emitting module 100 emits illumination light having a color temperature of 2200K to 1800K.

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

In this case, as shown in FIG. 7E, from the power supply circuit 200, the first input current I _{IN1 is} not output to the light emitting module 100, but 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. A current control circuit 120, in accordance with the second amount of current to the input current I _IN2, the second current I _IN2 supplied to the input 112 and the second light emitting portion 113 assigned 3 second light emitting portion, but in the minimum brightness of FIG. 6 (1% In the case of color adjustment control, all the second input current I _{IN2 is} supplied as the drive current I _L3 only to the third light emitting section 113. As a result, only the third light emitting part 113 in the light emitting module 100 is made to emit light, and the light emitting module 100 emits red light having a color temperature of 1800K.

As described above, in the lighting device 1 of this embodiment, as shown by the solid line in FIG. 5, when the color control is performed from a high color temperature to a low color temperature, the chromaticity points P ₃ to P _{5 are} relatively set to the third position. The amount of current flowing through the light emitting section 113 gradually increases. Therefore, in the lighting device 1X of Comparative Example 1, the chromaticity point of the color temperature of 2200K is P _X5 . However, in the lighting device 1 of this embodiment, the chromaticity point of the color temperature of 2200K is P ₄ , and the color temperature is 2200K. The chromaticity point moves from P _X5 to P ₄ . Therefore, the chromaticity of the illuminating light of the lighting fixture 1 can be made to be the chromaticity of a target close to the black body locus. That is, the third light emitting section 113 can shift the color deviation (Duv) of the illumination light of the luminaire 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, white light that satisfies the full range of the black body locus can be reproduced.

In addition, in the lighting fixture 1 of this embodiment, the current control circuit 120 provided in the light-emitting module 100 outputs a current in accordance with the current amount of the second input current I _IN2 supplied from the power supply circuit 200 to the current control circuit 120. In contrast, the second input current I _IN2 is distributed and supplied to the second light emitting section 112 and the third light emitting section 113. With this, although the three light-emitting sections 110 including the first light-emitting section 111, the second light-emitting section 112, and the third light-emitting section 113 are used, even if the number of input currents (output number) that can be independently controlled by the power supply circuit 200 is The two strands, which are smaller than the number of the light-emitting sections 110, can still change the color temperature of the illumination light by tracking the black body locus. That is, as the power supply circuit 200, the existing dual-circuit control power supply having a low cost and a simple configuration can be used to perform the color control of the light emitting module 100 including the three light emitting units 110 having different light colors.

Therefore, according to the luminaire 1 of this embodiment, it is possible to perform color reproduction with a light color close to the black body locus using the low-cost power supply circuit 200.

Furthermore, in the lighting fixture 1 of this embodiment, the brightness of the light emitting module 100 when only the third light emitting section 113 among the plurality of light emitting sections 110 emits light is 5% or less. Specifically, the brightness of the light emitting module 100 when only the third light emitting section 113 emits light is set to 1%.

In this way, in the present embodiment, in the process of synchronous color adjustment, in order to emit light with a low color temperature and brightness and an atmosphere, in the area C of FIG. 6 (a low color temperature area with a color temperature of 2200K or less), a complementary color circuit is used. Only the second input current I _{IN2 is} supplied to the third light emitting section 113 and only the third light emitting section 113 is turned on, thereby emitting red light with a low beam. Thereby, the low-color power supply circuit 200 is used to perform synchronous color adjustment so that the light color can be changed, and the hue in the low color temperature range can be achieved in a natural form. In addition, the brightness of the light-emitting module 100 when only the third light-emitting section 113 emits light is 5% or less, so that the atmosphere-like light unique to the small light bulb can be realized.

In particular, in the present embodiment, the third light emitting section 113 is disposed at the center of the substrate 130, so that a light source that mimics the atmosphere of a small light bulb can be realized more.

(Modification) Although the lighting fixture of the present invention has been described based on the embodiment, the present invention is not limited to the above-mentioned embodiment.

For example, in Embodiments 1 to 3 above, the dimming control of the plurality of light emitting sections is performed by phase dimming (two-wire type), but the dimming control method is not limited to this method, and it can also be implemented by PWM Dimming (four-wire type) or 0-10VDC dimming etc. implements dimming control of multiple light emitting parts.

In addition, in the above embodiment, although the LED elements constituting the light emitting section 110 are of the SMD type and the light emitting module 100 is of the SMD type, the present invention is not limited to this form. For example, a COB (Chip On Board) type light emitting module in which an LED chip (bare chip) is 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 portion 111, the second light-emitting portion 112, and the third light-emitting portion 113 may be mounted on a plurality of LED chips on the substrate 130 and the LEDs. The wafer seal is formed by a sealing member. In this case, in the first light-emitting portion 111 and the second light-emitting portion 112, a blue LED chip is used as the LED chip, and a fluorescent material containing one type or a plurality of types of fluorescent materials such as a yellow fluorescent material is used as the sealing member. . On the other hand, in the third light emitting section 113, a red LED chip is used as the LED chip, and a transparent resin containing no phosphor is used as the sealing member. In addition, in Embodiments 2 and 3, a COB-type light emitting module may be applied.

In the above-mentioned embodiment, the number of the light-emitting sections provided in the light-emitting module is three, but it is not limited to this embodiment. For example, three or more light emitting sections may be provided in the light emitting module. In this case, the output power of the power supplied from the power supply circuit to the light-emitting module is also smaller than the number of the light-emitting parts, and compared with a power source that uses the same number of output power as the number of the light-emitting parts In the case of a circuit, the cost of the power supply circuit can be further suppressed.

In addition, in the above-mentioned embodiment, although the color control of the light-emitting module is performed by using the dimmer switch 4 connected to the power supply unit via a wire, the present invention is not limited to this form. For example, it is also possible to implement a color control of the light-emitting module by sending a dimming / grading signal from the wireless terminal to the wireless module before the power module is built in the wireless module.

In addition, in the above-mentioned embodiment, although the synchronous color adjustment is performed in conjunction with the color adjustment and dimming during the color adjustment control, it is not limited to this form. For example, it is also possible to implement a color tone control that does not change the brightness but only changes the light color.

In addition, although the downlight is exemplified in the above embodiment, the present invention can also be applied to other lighting fixtures such as spotlights and basic lighting.

In addition, the above-mentioned embodiments are obtained by applying various modifications which are known to those skilled in the art in the technical field to which they belong, and in a range that does not deviate from the meaning of the present invention, by arbitrarily combining the constituent elements and functions of the embodiments. Also included in the present invention.

1.1X‧‧‧lighting equipment

10‧‧‧Lighting unit

100, 100X, 101‧‧‧ light-emitting modules

11‧‧‧ abutment

110‧‧‧Lighting Department

111‧‧‧The first light-emitting part

111a, 112a, 113a‧‧‧LED components

112‧‧‧Second light emitting section

113‧‧‧ 3rd light emitting unit

120‧‧‧Current control circuit

130‧‧‧ substrate

131‧‧‧input terminal

131a‧‧‧1st input terminal

131b‧‧‧ 2nd input terminal

131c‧‧‧3rd input terminal

2‧‧‧ ceiling

2a‧‧‧ opening

20‧‧‧ Power supply unit

200‧‧‧ Power Circuit

21‧‧‧Chassis

22‧‧‧circuit board

23‧‧‧Circuit Components

24‧‧‧Terminal Block

3‧‧‧ AC power

30‧‧‧Wire

4‧‧‧ dimmer switch

I _IN1 ‧‧‧ 1st input current

I _IN2 ‧‧‧ 2nd input current

I _L1 , I _L2 , I _L3 ‧‧‧ drive current

FIG. 1 is a schematic diagram of an installation example of the lighting fixture according to the embodiment. FIG. 2 is a diagram showing a circuit configuration of the lighting fixture according to the embodiment. FIG. 3 is a diagram showing a configuration of a light emitting module of the lighting fixture according to the embodiment. FIG. 4 is a diagram showing a circuit configuration of a lighting fixture of Comparative Example 1. FIG. FIG. 5 is an xy chromaticity diagram showing a change in light color of the illumination light generated by the color control of the lighting fixture of the embodiment and the lighting fixture of Comparative Example 1. FIG. FIG. 6 is a diagram showing a relationship between a color temperature and brightness in the color control of the lighting fixture according to the embodiment. FIG. 7A is a diagram showing the flow of current when the color adjustment control (the color adjustment control at the maximum brightness in FIG. 6) of the luminaire according to the embodiment is performed. FIG. 7B is a diagram showing the flow of current when the color adjustment control (the color adjustment control in the area A of FIG. 6) of the luminaire according to the embodiment is performed. FIG. 7C is a diagram showing the flow of current when the color adjustment control (the color adjustment control in the area B of FIG. 6) of the luminaire according to the embodiment is performed. FIG. 7D is a diagram showing the flow of current when the color adjustment control (the color adjustment control in the area C in FIG. 6) of the luminaire according to the embodiment is performed. FIG. 7E is a diagram showing a current flow when the color adjustment control (the color adjustment control at the minimum brightness in FIG. 6) of the luminaire according to the embodiment is performed. FIG. 8 is a diagram showing a configuration of a light-emitting module according to a modification.

Claims (7)

A lighting appliance includes: a light-emitting module having a plurality of light-emitting portions whose light colors are different from each other; and a power supply circuit that outputs power to the light-emitting module for causing the light-emitting module to emit light; the plurality of light-emitting components The first light-emitting part includes: a first light-emitting part; the second light-emitting part emits light having a color temperature lower than that of the light emitted by the first light-emitting part; and the third light-emitting part emits light having a color temperature higher than that of the second light-emitting part Light with a lower color temperature; the number of output powers of the power supplied from the power circuit to the light-emitting module is less than the number of the plurality of light-emitting portions; when only the third light-emitting portion of the plurality of light-emitting portions emits light The brightness of the light-emitting module is less than 5%. For example, the lighting fixture of the first patent application scope further includes a current control circuit that supplies current to the second light-emitting portion and the third light-emitting portion. The current control circuit depends on the current from the power supply circuit. The current output ratio of the amount of current supplied by the control circuit supplies current to the second light emitting section and the third light emitting section. For example, the lighting apparatus according to item 2 of the patent application scope, wherein the current control circuit is provided in the light emitting module. For example, the lighting device according to any one of claims 1 to 3, wherein the light color of the third light-emitting portion is red or amber. For example, the lighting fixture according to any one of claims 1 to 3, wherein the light emitting module includes a substrate; and the third light emitting portion is disposed at a central portion of the substrate. For example, the lighting device of the fifth scope of the patent application, wherein the second light-emitting portion is divided into a plurality of pieces; the third light-emitting portion is arranged between one of the plurality of the second light-emitting portions and the other. For example, the luminaire according to item 6 of the patent application scope, wherein the first light-emitting portion is disposed between the second light-emitting portion and the third light-emitting portion.