CN204164866U - Light source cell and ligthing paraphernalia - Google Patents

Abstract

The utility model provides a light source unit and a lighting appliance. According to an embodiment, there is provided a light source unit including three kinds of white light sources and a control unit. The three white light sources have chromaticity coordinates within the defined domain of the correlated color temperature and illuminate below. The correlated color temperatures of the three white light sources are different from each other. The control unit may perform dimming control on the three white light sources for each type. The solution provided by the utility model can not only reproduce a wider range of correlated color temperature, but also suppress the decline of luminous efficiency or satisfy the user's comfort.

Description

Light source unit and lighting fixture

technical field

The embodiment of the utility model relates to a light source unit (unit) and a lighting appliance.

Background technique

For example, the development of lighting fixtures using light-emitting elements such as light-emitting diodes (Light Emitting Diode, LED) as light sources is being promoted. Examples of lighting fixtures using light-emitting diodes as light sources include ceiling lights, base lights, and bulb-shaped LEDs mounted on ceilings and the like in houses. Such lighting fixtures are expected not only to simply illuminate the surroundings, but also to create an appropriate light space that matches the scene of life along with the diversification of life styles. For example, it is desired to reproduce a wider range of correlated color temperatures and to suppress a decrease in luminous efficiency. Alternatively, functions such as satisfying the user's comfort in consideration of, for example, the surrounding environment and the influence of light on the living body are desired.

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2013-98038

Utility model content

[Problems to be solved by the utility model]

Embodiments of the present utility model provide a light source unit and a lighting fixture, which can reproduce a wider range of correlated color temperatures, and can suppress the decrease in luminous efficiency or satisfy user comfort.

[Technical means to solve the problem]

According to an embodiment, there is provided a light source unit including three kinds of white light sources and a control unit. The three white light sources have chromaticity coordinates within the defined domain of the correlated color temperature and illuminate below. The correlated color temperatures of the three white light sources are different from each other. The control unit can perform dimming control on the three types of white light sources for each type.

Further, a light source unit is provided, and the three kinds of white light sources include:

a first light-emitting element with a first correlated color temperature;

a second light emitting element having a second correlated color temperature lower than the first correlated color temperature; and

a third light emitting element having a third correlated color temperature lower than the first correlated color temperature and the second correlated color temperature,

The second correlated color temperature exists in a range of correlated color temperatures reproducible by the first light emitting element and the third light emitting element.

According to another embodiment, there is provided a light source unit, comprising:

a first light source with a first correlated color temperature;

a second light source disposed outside the first light source and having a color temperature different from the first correlated color temperature; and

a control unit capable of performing dimming control on the first light source and the second light source,

A ratio of blue light contained in light emitted from the first light source is lower than a ratio of blue light contained in light emitted from the second light source.

Further, the first light source has a peak wavelength in the range above 580 nm, and the second light source has a peak wavelength in the range below 500 nm.

Furthermore, in the relative spectral distribution of the first light source, the energy in the wavelength region below 500 nanometers accounts for 15% or less of the energy in the entire wavelength region,

In the relative spectral distribution of the second light source, the energy in the wavelength region of 500 nanometers or less accounts for 25% or more of the energy in the entire wavelength region.

According to another embodiment, a lighting fixture is provided, including: the light source unit described above.

(effect of utility model)

According to the embodiments of the present invention, a light source unit and a lighting fixture can be provided, which can reproduce a wider range of correlated color temperature, and can suppress the decrease of luminous efficiency or satisfy user's comfort.

Description of drawings

1( a ) and FIG. 1( b ) are schematic perspective views showing a lighting fixture including a light source unit according to an embodiment.

Fig. 2 is a schematic exploded view showing a lighting fixture according to the embodiment.

3(a) and 3(b) are schematic plan views showing the light source unit according to the embodiment.

4 is a schematic plan view showing an example of a light source unit according to the embodiment.

FIG. 5 is a block diagram showing a configuration of a main part of a light source unit according to the embodiment.

Fig. 6 is a schematic plan view showing an example of a light source unit according to another embodiment.

7( a ) and FIG. 7( b ) are graphs showing relative spectral distributions of light emitted by the light emitting element of the embodiment.

[explanation of the symbol]

100: lighting fixtures

110: Power supply department

110a: upper surface

111: Fitting part

113: Adapter guide

115: Control Department

115a: Setting information input/output section

115b: Dimming control means

115c: Means of storage

116: circuit parts

117a: PWM control circuit

117b: switch control circuit

118a: Pattern storage unit

120: appliance body

120a: lower surface

121: hole

127: Remote control signal receiving unit

130, 130a: Light source department

131: Substrate

131a: Lower surface

133: Light emitting element

133a: 1st light emitting element

133b: 2nd light emitting element

133c: 3rd light-emitting element

133d: 1st light emitting element

133e: 2nd light emitting element

134a: Column 1

134b: Column 2

134c: column 3

134d: Column 4

135: wire

137: Power supply department

138a: The first group (group on the inner peripheral side)

138b: Group 2 (group on the outer peripheral side)

139a: Columns on the inner peripheral side

139b: Columns on the outer peripheral side

140: Light distribution control department

141: Lens Department

141a: Part 1

141b: Part 2

145: Convex

150: Hood

150a: lower surface

160: Indirect light source department

161: Substrate

163: light emitting element

165: Hood

180: remote control transmitter

210, 210a: light source unit

Al: area

AC: commercial AC power

CN: Connector (electrical connection part)

Detailed ways

Embodiments will be described below with reference to the drawings. For the same parts in the drawings, the same numbers are attached and their detailed descriptions are appropriately omitted, and only the different parts will be described. In addition, the drawings are only schematic or conceptual diagrams, and the relationship between the thickness and width of each part, the size ratio between parts, and the like are not necessarily the same as the actual ones. Moreover, even when showing the same part, it may show with mutually different size or a ratio depending on drawing.

1( a ) and FIG. 1( b ) are schematic perspective views showing a lighting fixture including a light source unit according to an embodiment.

Fig. 2 is a schematic exploded view showing a lighting fixture according to the embodiment.

3(a) and 3(b) are schematic plan views showing the light source unit according to the embodiment.

Fig. 1(a) is a schematic perspective view showing the light emitting surface side of a lighting fixture including a light source unit according to an embodiment. Fig. 1(b) is a schematic perspective view showing the side opposite to the light-emitting surface of a lighting fixture including the light source unit according to the embodiment. Fig. 3(a) is a schematic plan view showing the light emitting surface side of the light source unit according to the embodiment. FIG. 3( b ) is a schematic enlarged view of a region Al shown in FIG. 3( a ) enlarged and observed.

The lighting fixture 100 shown in Fig. 1(a) to Fig. 3(b) is a lighting fixture for ordinary households that is mounted on a hook ceiling body (hook ceiling body) as a wiring fixture. Set on the appliance installation surface. The lighting fixture 100 shown in FIGS. 1( a ) to 3 ( b ) illuminates a room by light radiated from a light source unit having a plurality of light emitting elements mounted on a substrate. However, the lighting fixtures of the embodiments are not limited thereto. For example, the lighting fixture of the embodiment may be a basic lighting lamp, a bulb-shaped light (light), or the like. Hereinafter, a so-called ceiling lamp will be described as an example.

As shown in FIGS. 1( a ) to 3 ( b ), the lighting fixture 100 of the embodiment includes a light source unit 210 , a light distribution control unit 140 , and a cover (cover) 150 . The light source unit 210 has a power supply unit 110 , a device main body 120 and a light source unit 130 .

The cover 150 is, for example, a milky-white acrylic resin molded body, and has translucency. The lower surface 150a of the cover 150 forms a light emitting surface.

Although the external shape of the lighting fixture 100 shown in FIG.1(a) - FIG.3(b) is circular, it is not limited to this. For example, the shape of the lighting fixture 100 can also be oval or square.

The power supply unit 110 has a chassis formed from a flat plate of a metal material such as a cold-rolled steel plate. The chassis of the power supply unit 110 is combined into a ring shape. Inside the chassis of the power supply unit 110, circuit components 116 (see FIG. 2 ) including the control unit 115 are provided. As shown in FIG. 1( b ), the power supply unit 110 has a fitting portion 111 at the center of an upper surface 110 a. The fitting portion 111 is fitted to, for example, a ceiling socket main body as a connecting device (wiring device) installed on the ceiling of a house, and fixes the device body 120 to the ceiling. An adapter guide 113 for guiding the ceiling lamp holder main body is attached to the fitting portion 111 .

In this specification, for convenience of description, the side of cover 150 viewed from power supply unit 110 is referred to as “below”, and the side of power supply unit 110 viewed from cover 150 is referred to as “upper”. The same is true for other constituent elements.

The appliance main body 120 is, for example, a chassis formed by forming a flat plate of a metal material such as a cold-rolled steel plate. A hole 121 through which the adapter guide 113 passes is formed in a substantially central portion of the tool body 120 .

The light source unit 130 has a substrate 131 and a plurality of light emitting elements (light sources) 133, and is provided detachably from the power supply unit 110 via a connection unit. The light emitting element 133 is provided on the lower surface 131 a of the substrate 131 . The substrate 131 has a structure in which two substantially arc-shaped substrates having a predetermined width are connected, and is formed in a substantially ring shape as a whole. That is, the substrate 131 formed in a substantially ring shape as a whole has two divided substrates. The plurality of divided substrates 131 are electrically connected by connectors (electrical connection parts) CN via wires 135 and the like inside the substrates 131 . The base plate 131 is fixed to the lower surface 120 a of the appliance body 120 . In addition, the substrate 131 may have four divided substrates.

By using a divided substrate, it is possible to suppress deformation of the substrate 131 by absorbing thermal shrinkage at the divided portion of the substrate 131 . In addition, it is preferable to use a plurality of divided substrates, but it is also possible to use a single substrate integrally formed in a substantially ring shape. Furthermore, a power supply unit 137 is provided on the inner peripheral side of a specific substrate 131 . Specifically, the power supply unit 137 is a connector CN. The output line W electrically connected to the lighting device is connected to the power supply unit 137 , and supplies electric power to the plurality of light emitting elements 133 via the wiring pattern of the substrate 131 .

A member that reflects light emitted from the light emitting element 133 is coated on the lower surface 131 a of the substrate 131 . For example, a resin in which titanium oxide or the like is dispersed is coated on the lower surface 131 a of the substrate 131 . By coating the reflective member on the lower surface 131 a of the substrate 131 , it is possible to prevent a reduction in the brightness of the central portion of the device main body 120 .

The substrate 131 has, for example, an insulating substrate such as glass epoxy resin and wiring formed using copper foil. The reflective member is coated on the lower surface 131a of the substrate 131 except the portion where the light emitting element 133 is arranged. That is, the substrate 131 has wiring covered by the reflective member, and electrically connects the plurality of light emitting elements 133 .

The light emitting element 133 is an LED (Light Emitting Diode). The light emitting element 133 is a surface mount type LED package. As shown in FIG. 3( a ) and FIG. 3( b ), the LED packages are mounted along the circumferential direction of a plurality of (two in the example of FIG. 3( a )) circular substrates 131 . Furthermore, the LED packages are mounted on substantially concentric circles having different radii over a plurality of rows (two rows in the example of FIG. 3( a )). That is, the LED package is mounted over the row (first row) 139a on the inner peripheral side and the row (second row) 139b on the outer peripheral side.

LED packages generally include: LED chips (chips), arranged in cavities (cavities) formed of ceramics or synthetic resins; and molds (molds) such as epoxy resins or silicone resins. Translucent resin for sealing LED chips.

The light source unit 130 of the embodiment has various light emitting elements 133 . More specifically, the light source unit 130 of the embodiment has three types of light emitting elements 133 having different correlated color temperatures. For the LED packages mounted on the row 139a on the inner peripheral side, the first light-emitting element (first light source) 133a with a correlated color temperature of about 6500 Kelvin (K) (first correlated color temperature) is used, and the correlated color temperature is The second light emitting element (second light source) 133b having a correlated color temperature of about 3000K (second correlated color temperature) and the third light emitting element (third light source) 133c having a correlated color temperature of about 2000K (third correlated color temperature). The first light emitting element 133a emits light of daylight color (D). The second light emitting element 133b emits light of light bulb color (L).

The first light-emitting element 133a, the second light-emitting element 133b, and the third light-emitting element 133c are successively arranged at substantially equal intervals from the first light-emitting element 133a, the second light-emitting element 133b, and the third light-emitting element 133c in order on the circumference. The LED chip is an LED chip that emits blue light. Phosphor is mixed in the translucent resin. In order to be able to emit light of the daylight color system of light bulb color (L) and daylight color (D), as a phosphor, a yellow phosphor is mainly used or a red phosphor is used to supplement the red component. Blue light is light of the yellow system in which there is a complementary color relationship. The mounting form of the LED packages in the row 139b on the outer peripheral side is the same as the mounting form of the LED packages in the row 139a on the inner peripheral side.

In this specification, for convenience of description, the first light-emitting element 133a with a correlated color temperature of about 6500K, the second light-emitting element 133b with a correlated color temperature of about 3000K, and the third light-emitting element 133c with a correlated color temperature of about 2000K At least any one of them is called "white light source" or "main light source". In other words, "white light source" and "main light source" refer to a light source that has chromaticity coordinates within the definition domain of the correlated color temperature and mainly illuminates below.

In addition, the arrangement of the first light-emitting element 133a, the second light-emitting element 133b, and the third light-emitting element 133c is not specific, and the order may be different, for example, the second light-emitting element 133b, the first light-emitting element 133a, the third light-emitting element 133c in sequence. Furthermore, it is preferable that adjacent light emitting elements emit lights having different correlated color temperatures, but it is not particularly limited. As an example, like the first light emitting element 133a, the first light emitting element 133a, the second light emitting element 133b, the second light emitting element 133b, the third light emitting element 133c, and the third light emitting element 133c, light emitting elements emitting light of the same color Every two are arranged consecutively.

The control unit 115 can perform dimming control (individual control) for each light emitting element 133 . The details of the dimming control by the control unit 115 will be described later.

The light distribution control unit 140 is fixed to the device main body 120 and covers the light emitting element 133 and the electrical connection part and the power supply part between the plurality of divided substrates 131 . The material of the light distribution control unit 140 includes resin, for example. The light distribution control unit 140 covers the entire light source unit (charging unit) 130 . Therefore, the light distribution control unit 140 has a function of protecting the light source unit 130 . In addition, on the inner peripheral side of the light distribution control part 140, a convex part 145 corresponding to the electrical connection part and the power supply part of the board|substrate 131 is formed. The protrusion 145 is formed to be longer than the size of the connector in the circumferential direction which is the annular direction. That is, the light distribution control unit 140 is configured to be attached to and detached from the appliance body 120 by rotation, and thus has a convex portion 145 that is longer than the connector dimension in the circumferential direction so as not to interfere with the electrical connection when the light distribution control unit 140 is rotated. The connection part CN and the electric wire 135 interfere.

As shown in FIG. 2 , the light distribution control unit 140 has a lens unit 141 . The lens part 141 has the 1st part 141a and the 2nd part 141b. The first portion 141a covers the light emitting elements 133 in the row 139a on the inner peripheral side, and controls the light distribution of the light emitting elements 133 in the row 139a on the inner peripheral side. The second portion 141b covers the light emitting elements 133 in the row 139b on the outer peripheral side, and controls the light distribution of the light emitting elements 133 in the row 139b on the outer peripheral side. That is, the light distribution control unit 140 of the embodiment independently controls the light distribution of the light emitting elements 133 arranged along each column for each column.

Thereby, it is possible to reduce the chromatic aberration and brightness unevenness of the lower surface (light emitting surface) 150a of the cover 150, and to achieve uniformity of chromaticity and brightness.

The light source unit 210 of the embodiment will be further described with reference to the drawings.

4 is a schematic plan view showing an example of a light source unit according to the embodiment.

Table 1 is a table showing examples of specifications of light-emitting elements according to the embodiment.

FIG. 5 is a block diagram showing a configuration of a main part of a light source unit according to the embodiment.

4 is a schematic plan view of the light source unit according to the embodiment viewed from the light emitting surface side.

In the example shown in FIG. 4 and Table 1, 34 first light emitting elements 133a are provided. That is, 17 first light emitting elements 133a are provided along the row 139a on the inner peripheral side, and 17 first light emitting elements 133a are provided along the row 139b on the outer peripheral side. The arrangement form of the second light emitting element 133b and the arrangement form of the third light emitting element 133c are the same as the arrangement form of the first light emitting element 133a. Table 1 shows other specifications of the first light emitting element 133a, the second light emitting element 133b, and the third light emitting element 133c. However, the respective specifications of the first light emitting element 133a, the second light emitting element 133b, and the third light emitting element 133c are not limited thereto.

[Table 1]

As shown in FIG. 5 , the power supply unit 110 is connected to a commercial AC power supply AC. The light source unit 130 is connected to the power supply unit 110 .

The power supply unit 110 functions as a DC power supply, receives a commercial AC power supply AC, and generates a DC output. The light source unit 130 is as described above with respect to FIGS. 1( a ) to 3 ( b ).

The indirect light source unit 160 is arranged on the back side (upper side) of the appliance main body 120 as shown in FIG. 1( b ), and mainly has a function of illuminating the ceiling surface. A plurality of indirect light source units 160 are provided around the fitting portion 111 and have a substrate 161 and a plurality of light emitting elements 163 . The substrate 161 is formed, for example, as a substantially rectangular flat plate. The light emitting elements 163 are mounted on the substrate 161 in a substantially linear arrangement along the longitudinal direction of the substrate 161 . The correlated color temperature of the light emitting element 163 is about 3000K. The light emitting element 163 emits light of a light bulb color (L).

The indirect light source unit 160 is mounted on four places on the upper side wall of the power supply unit 110 . More specifically, as shown in FIG. 1( b ), the upper portion of the power supply unit 110 is formed in a substantially quadrangular shape. The indirect light source unit 160 is attached to an upper side wall of the substantially quadrangular power supply unit 110 . The indirect light source units 160 installed at four locations are covered with covers 165 , respectively.

The control unit 115 has a setting information input/output unit 115a, a dimming control unit 115b, and a storage unit 115c. The dimming control part 115b is connected to the setting information input/output part 115a. The storage unit 115c is connected to the setting information input/output unit 115a. A remote control signal receiving unit 127 is connected to the setting information input/output unit 115a. In the storage section 115c, a mode storage section 118a is provided.

In the dimming control part 115b, a pulse width modulation (Pulse Width Modulation, PWM) control circuit 117a and a switching (switching) control circuit 117b are provided. The switch control circuit 117b is connected to the PWM control circuit 117a. As shown in FIG. 5 , the PWM control circuit 117 a and the switch control circuit 117 b are provided for the first light emitting element 133 a , the second light emitting element 133 b , the third light emitting element 133 c and the light emitting element 163 of the indirect light source unit 160 , respectively. That is, four PWM control circuits 117a and four switch control circuits 117b are provided.

Accordingly, the control unit 115 can independently control the light source unit 130 and the indirect light source unit 160 . Furthermore, the control unit 115 can perform dimming control (individual control) for each light emission color. Therefore, for the light source unit 130, the dimming ratio of each luminous color can be adjusted so that the light output of each luminous color can be changed. The luminous colors of the second light-emitting element 133b and the third light-emitting element 133c having a correlated color temperature of about 2000K are mixed to express a desired luminous color (individual control mode). For example, the user can adjust the dimming ratio of each luminous color to change the light output of each luminous color by operating the remote control transmitter 180 .

Here, according to the knowledge obtained by the inventors of the present invention, light including blue light suppresses the secretion of melatonin. Therefore, when the user is irradiated with light including blue light, the sleep latency may become longer. That is, falling asleep is sometimes hindered. Therefore, it is desirable to reproduce a wider range of correlated color temperatures for the light source unit 210 and the lighting fixture 100 . However, in the case where, for example, two white light sources are provided in order to reproduce a wider range of correlated color temperatures, the difference between the correlated color temperature of one white light source and the correlated color temperature of the other white light source must be further increased. As a result, luminous efficiency decreases.

More specifically, the perceptual efficiency of the light source is weighted by the International Commission on Illumination (Commission Internationale de l'Eclairage, CIE) standard specific perceptibility. According to the CIE standard for specific visual sensitivity, in photopic vision, the visual sensitivity of light with a wavelength of 555 nanometers (nm) reaches the maximum. Therefore, the luminous efficiency of low color temperature LEDs with relatively more relative energy distribution on the long wavelength side is generally low.

For example, assume a case where light with a correlated color temperature of 2200K and a luminous flux of 1000 lumens (lm) is realized. At this time, the control unit 115 adjusts the light of the 6500K light source and the 2000K light source with a luminous flux ratio of 1.5:8.5. Thus, 2200K light consumes 20 watts (Watt) (W) of electricity. Also, the luminous efficiency was 50lm/W.

In contrast, the light source unit 210 of the embodiment includes three types of light emitting elements 133 having different correlated color temperatures. In the example shown in FIG. 4 and Table 1, the light source unit 210 has a first light-emitting element 133a with a correlated color temperature of about 6500K, a second light-emitting element 133b with a correlated color temperature of about 3000K, and a light-emitting element 133b with a correlated color temperature of about 2000K. The third light emitting element 133c. At this time, if it is desired to realize light with a correlated color temperature of 2200K and a luminous flux of 1000 lumens (lm), the control unit 115 adjusts the light sources of 6500K, 3000K, and 2000K with a luminous flux ratio of 0.5:3.0:6.5 . Thus, 2200K light consumes 17W of power. Also, the luminous efficiency was 58lm/W. Accordingly, the luminous efficiency when the light source unit has three types of light-emitting elements having different correlated color temperatures is higher than the luminous efficiency when the light source unit has two kinds of light-emitting elements which have different correlated color temperatures.

According to the embodiment, the light source unit 210 has a third type of light emitting element (in the embodiment, the first light emitting element 133a and the third light emitting element 133c) in the region of the correlated color temperature reproducible by the two types of light emitting elements (in the embodiment, the first light emitting element 133a and the third light emitting element 133c). the second light emitting element 133b). Therefore, the light source unit 210 and the lighting fixture 100 of the embodiment can reproduce a wider range of correlated color temperature, and can suppress the decrease of luminous efficiency.

Next, another embodiment will be described with reference to the drawings.

Fig. 6 is a schematic plan view showing an example of a light source unit according to another embodiment.

7( a ) and FIG. 7( b ) are graphs showing relative spectral distributions of light emitted by the light emitting element of the embodiment.

6 is a schematic plan view showing the light source unit according to the embodiment viewed from the light emitting surface side.

Fig. 7(a) is a graph illustrating the relative spectral distribution of the first light emitting element. Fig. 7(b) is a graph illustrating the relative spectral distribution of the second light emitting element.

As shown in FIG. 6 , the light source unit 130 a of the light source unit 210 a according to the embodiment includes two types of light emitting elements 133 having different correlated color temperatures. For the LED packages mounted in the group 138a on the inner peripheral side, a first light emitting element (first light source) 133d having a correlated color temperature of about 2700K is used. In the group 138a on the inner peripheral side, a first row 134a and a second row 134b are provided. The first row 134a and the second row 134b form substantially concentric circles with different radii. The radius of the second row 134b is larger than the radius of the first row 134a. The first light emitting element 133d is mounted over the first column 134a and the second column 134b.

The second light emitting element (second light source) 133e having a correlated color temperature of about 5000K is used for the LED packages mounted in the group 138b on the outer peripheral side. In the group 138b on the outer peripheral side, a third row 134c and a fourth row 134d are provided. The first row 134a, the second row 134b, the third row 134c, and the fourth row 134d form substantially concentric circles whose radii are different from each other. The radius of the third row 134c is larger than the radius of the second row 134b. The radius of the fourth column 134d is greater than the radius of the third column 134c. The second light emitting element 133e is mounted over the third column 134c and the fourth column 134d.

As shown in FIG. 7( a ), the first light emitting element 133 d has a peak wavelength in the range of 580 nm or more. In the relative spectral distribution of the first light emitting element 133d, the ratio of the energy E1 in the wavelength range of 500 nm or less to the energy in the entire wavelength range is 15% or less. In the example of the graph shown in FIG. 7( a ), the ratio of the energy E1 in the wavelength range below 500 nm to the energy in the entire wavelength range is about 10%.

As shown in FIG. 7(b), the second light emitting element 133e has a peak wavelength in the range of 500 nm or less. In the relative spectral distribution of the second light emitting element 133e, the ratio of the energy E2 in the wavelength region of 500 nm or less to the energy in the entire wavelength region is 25% or more. In the example of the graph shown in FIG. 7( b ), the ratio of the energy E2 in the wavelength range below 500 nm to the energy in the entire wavelength range is about 34%.

For example, the control unit 115 executes control to gradually change the correlated color temperature from the full-light state in which the luminous colors are mixed by maximizing the light outputs of all the first light-emitting elements 133d and all the second light-emitting elements 133e to The first light emitting element 133d at about 2700K dims light. Therefore, the luminescent color in the full light state gradually approaches orange (orange) color with relatively less blue components. Then, the light emitting surface becomes smaller toward the central portion. Thereby, the blue light component contained in the mixed light can be relatively reduced, the melatonin suppression degree of the indoor occupants can be reduced, and sound sleep can be promoted.

Thus, the blue light component of the first light emitting element 133d is smaller than the blue light component of the second light emitting element 133e. In other words, the proportion of blue light contained in the light emitted by the first light emitting element 133d is lower than the proportion of blue light contained in the light emitted by the second light emitting element 133e.

Accordingly, various light scenes can be created by arranging and individually controlling light sources having mutually different relative spectral distributions (the first light emitting element 133d and the second light emitting element 133e in the embodiment). The number of first light emitting elements 133d provided in the central portion of the light source unit 210a is smaller than the number of second light emitting elements 133e provided in the peripheral portion of the light source unit 210a. Therefore, cost reduction can be achieved, and occurrence of chromatic aberration can be suppressed.

Although some embodiments of the present invention have been described, these embodiments are merely examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in other various forms, and various omissions, substitutions, and changes are possible without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope or spirit of the invention, and are included in a range equivalent thereto.

Claims (6)

1. a light source cell, is characterized in that, comprising:

Three kinds of white light sources, described three kinds of white light sources are the white light sources having chromaticity coordinate and irradiate below in the domain of definition of correlated colour temperature, and described correlated colour temperature is different; And

Control part, can carry out brightness adjustment control for each kind to described three kinds of white light sources.

2. light source cell according to claim 1, is characterized in that,

Described three kinds of white light sources comprise:

1st light-emitting component of the 1st correlated colour temperature;

2nd light-emitting component of 2nd correlated colour temperature lower than described 1st correlated colour temperature; And

Than the 3rd light-emitting component of described 1st correlated colour temperature and low the 3rd correlated colour temperature of described 2nd correlated colour temperature,

Described 2nd correlated colour temperature is present in the region of the correlated colour temperature can reproduced by described 1st light-emitting component and described 3rd light-emitting component.

3. a light source cell, is characterized in that, comprising:

1st light source of the 1st correlated colour temperature;

2nd light source, more described 1st light source and be arranged on outside, and colour temperature is different from described 1st correlated colour temperature; And

Control part, can carry out brightness adjustment control respectively to described 1st light source and described 2nd light source,

The ratio of blue light contained in the light of described 1st light source radiation is lower than the ratio of blue light contained in the light of described 2nd light source radiation.

4. light source cell according to claim 3, is characterized in that,

In the scope of described 1st light source more than 580 nanometers, there is peak wavelength,

In the scope of described 2nd light source below 500 nanometers, there is peak wavelength.

5. the light source cell according to claim 3 or 4, is characterized in that,

The ratio that the energy of in the relative spectral power distribution of described 1st light source, below 500 nanometers wavelength region is shared in the energy of full wavelength region is less than 15%,

The ratio that the energy of in the relative spectral power distribution of described 2nd light source, below 500 nanometers wavelength region is shared in the energy of full wavelength region is more than 25%.

6. a ligthing paraphernalia, is characterized in that, comprising:

Light source cell according to any one of claim 1 to 5.