JP2020167063A - Lighting device - Google Patents

Abstract

To provide a lighting device capable of irradiating an object to be irradiated with suitable light.SOLUTION: A lighting device according to an embodiment includes a light source unit including a first light source that emits red light having a peak wavelength of 680 nm or more and a white light source, and further includes a control unit that controls the light source unit, and the output from the light source unit is controlled according to the target chromaticity coordinates corresponding to an object to be irradiated.SELECTED DRAWING: Figure 2

Description

An embodiment of the present invention relates to a lighting device.

In recent years, in a lighting device using an LED (Light Emitting Diode) as a light source, there is a lighting device that makes the human eye recognize the object with its original natural color when irradiating the object. In such a lighting device, light having a fixed spectral distribution is irradiated by a combination of a phosphor or an LED.

However, since the hue differs depending on the object, it is necessary to change the light emitted from the lighting device accordingly. If the light does not match the object, the object may not be recognized with an accurate hue. In the conventional lighting device, it is necessary for the side on which the lighting device is installed to determine the light suitable for the irradiation target, and to replace the lighting device according to the irradiation target. Therefore, there has been a need for a lighting device capable of irradiating light suitable for the object to be irradiated.

JP-A-2018-041856

An object to be solved by the present invention is to provide an illuminating device capable of irradiating light suitable for an object to be irradiated.

The lighting device according to an example of the embodiment includes a light source unit including a first light source that emits red light having a peak wavelength of 680 nm or more and a white light source. Further, a control unit for controlling the light source unit is provided, and the output from the light source unit is controlled according to the target chromaticity coordinates corresponding to the irradiation target object.

According to the embodiment, it can be expected to provide a lighting device capable of irradiating light suitable for the object to be irradiated.

It is a figure which shows the lighting apparatus which shows one Embodiment. It is a figure which shows the light source apparatus which shows one Embodiment. It is a chromaticity diagram which shows the chromaticity coordinates of the light source arranged in the light source apparatus which shows one Embodiment. It is a graph which shows an example of the spectrum of the light source arranged in the lighting apparatus which shows one Embodiment. It is a chromaticity diagram which shows an example of the chromaticity coordinates of the light source arranged in the lighting apparatus which shows one Embodiment. It is a graph which shows the color matching function. It is a graph which shows the example of the spectral reflectance with respect to the skin color. It is a figure which shows the lighting apparatus of the 1st modification. It is a figure which shows the lighting apparatus of the 1st modification. It is a chromaticity diagram which shows an example of the chromaticity coordinates of the light source arranged in the lighting apparatus of the 1st modification.

Hereinafter, one embodiment will be described with reference to the drawings. In the following, visible light will be described. That is, light having a wavelength in the range of 380 nm to 780 nm, which is visible light that can be perceived by the human eye, will be described. Further, in the present specification, white refers to light having a color temperature in the range of 1800K to 20000K.
FIG. 1 shows a lighting device 1 that irradiates an object. The lighting device 1 includes a light source device 2 and a control unit 3 that controls lighting of the light source device 2.

FIG. 2 shows the light source device 2. The light source device 2 includes a first light source 10 and a second light source 20. The first light source 10 and the second light source 20 are each formed by one light source or a plurality of light sources. Further, as shown in FIG. 2, it is not limited to the form in which the first light source 10 and the second light source 20 are individually arranged in one row. For example, the light sources may be arranged in a staggered arrangement in which the light sources are scattered, or the second light source 20 may be arranged so as to cover the first light source 10.

The first light source 10 is a red light source having a peak wavelength of 680 nm or more. The peak wavelength of the first light source 10 is, for example, 680 nm or more and 780 nm or less, preferably 680 nm or more and less than 700 nm. Further, the first light source 10 is a solid-state light source such as an LED, LD, or OLED, and it is desirable that the half width is 5 nm or more and 60 nm or less.

The second light source 20 is a white light source, for example, a white light source having a color temperature of 3000 K and a color deviation of 0. The second light source 20 is, for example, a light source having three colors of red, green, and blue, or a solid light source of three colors of red, yellow, and blue, or a yellow phosphor using a blue solid light source as an excitation light source. It may be a light source in which at least one of a green phosphor and a red phosphor is excited.

The control unit 3 controls the lighting of the light source device 2. The control unit 3 has a power supply function and a control function, and can individually control the lighting of the first light source 10 and the second light source 20 of the light source device 2. For example, a PWM waveform or DC waveform current is input to each light source to control dimming of each light source individually, or dimming control to gradually brighten or darken each light source in terms of time and time. You can also.

The control signal for operating the control function may be input by operating a button or a knob provided on the lighting device 1, for example, or a control signal may be input from the outside. When a control signal is input from the outside, for example, an optical signal such as infrared rays or visible light may be input from a remote controller, or a signal may be input from a communication device by wired or wireless communication.

Further, the light source device 2 may include a third light source 30 and a fourth light source 40. Further, the second light source 20 may be a lime color light source or an amber color light source instead of white.

The third light source 30 is a blue light source having a peak wavelength of 490 nm or less. The peak wavelength of the third light source 30 is, for example, 400 nm or more and 490 nm or less. Further, the third light source 30 is a solid-state light source such as an LED, LD, or OLED, and it is desirable that the half width is 5 nm or more and 60 nm or less.

The fourth light source 40 is a green light source having a peak wavelength of 490 nm or more and 550 nm or less. The peak wavelength of the fourth light source 40 is preferably 490 nm or more and 520 nm or less. Further, the fourth light source 40 may be composed of only a solid light source such as an LED, LD or OLED, or may be composed of a combination of a solid light source such as an LED, LD or OLED and a phosphor. When it is composed only of a solid-state light source such as an LED, LD, or OLED, it is desirable that the half width is 5 nm or more and 60 nm or less.

When the lighting device 1 irradiates an object, the light source device 2 is controlled by the control unit 3 according to the target chromaticity coordinates corresponding to the irradiation target object in the output from the lighting device 1. The target chromaticity coordinates corresponding to the irradiation target object here are, for example, the chromaticity coordinates of the light emitted from the light source device 2 that improves the visibility of the irradiation target object. That is, by irradiating the object with light controlled to the target chromaticity coordinates, the hue and texture of the object can be accurately identified by the human eye.

The target chromaticity coordinates are derived using, for example, the reflectance of the object to be irradiated, the luminosity curve of the human eye, or both. That is, when the light emitted by the light source device 2 hits the object to be irradiated and the reflected light is received by the human eye, the target chromaticity coordinates are derived assuming the chromaticity. Since the conventional lighting device focuses only on the light emitted from the lighting device, the color is slightly deviated when the object is irradiated, and it is necessary to fine-tune the light source. By using this control method, since control is performed according to the color received by the human eye from the beginning, it is possible to irradiate the object smoothly without fine adjustment.

The target chromaticity coordinates may be extracted by referring to a table in which the irradiation target and the target chromaticity coordinates are linked, for example. This table may be provided in a storage area arranged in the lighting device 1, for example, or may be recorded on a network. When referring to the table, the step of inputting the information of the irradiation target and the step of outputting the target chromaticity coordinates are included. The information of the irradiation target object here may be the name of the irradiation target object, image data of the irradiation target object, or reflectance data. For example, when inputting image data or reflectance data of an irradiation target object, a step of determining what the irradiation target object is may be included in between.

Further, the target chromaticity coordinates are not limited to the form of referencing the table. For example, the target chromaticity coordinates may be calculated based on the information of the irradiation target object. In this case, the step of inputting the information of the object into the lighting device 1 or the computer arranged on the network, the step of determining the target chromaticity coordinates based on the information of the object by the computer, and the step of determining the target chromaticity coordinates are performed. Includes steps to output. The computer here refers to, for example, a processor or a CPU. Further, the information of the irradiation target object here may be the name of the irradiation target object, image data of the irradiation target object, or reflectance data.

Here, the chromaticity coordinates of the first light source 10, the second light source 20, the third light source 30, and the fourth light source 40 will be described with reference to the xy chromaticity diagram. FIG. 3 shows an example of an xy chromaticity diagram. In FIG. 3, it is shown that the larger the value of x on the horizontal axis, the stronger the red color, and the smaller the value of x, the stronger the blue color. Further, the larger the value of y on the vertical axis, the stronger the green color, and the smaller the value of y, the stronger the blue color. That is, it shows that the closer to blue, the smaller the values of both x and y, the closer to green, the larger the value of y, and the closer to red, the larger the value of x.

Further, in FIG. 3, a blackbody locus 50 representing a color temperature is shown in the center of the chromaticity diagram. In the blackbody locus 50, the point where the lowest color temperature is the lowest is the low color temperature point 51, and the point where the color temperature corresponds to infinity is the high color temperature point 52. The low color temperature point 51 is the point where the value of x is the largest in the blackbody locus 50, and the first chromaticity coordinate 11 which is the chromaticity coordinate of the first light source 10 described later.
It is almost close to. The high color temperature point 52 is a point where the value of x is the smallest in the blackbody locus 50, and is, for example, a point showing a color temperature higher than 20000K. The low color temperature point 51 may be, for example, a point where the color temperature is 500K. Further, in FIG. 3, the arc portion of the chromaticity diagram having a substantially semi-elliptical shape is the outer peripheral portion 53, which represents the spectral locus. In the chromaticity diagram, the outer peripheral portion 53 is formed so as to start from the point where y is the smallest and connect to the point where x is the largest.

In the present embodiment, the first light source 10 is a red light source having a peak wavelength of 680 nm or more, and the first chromaticity coordinate 11 which is the chromaticity coordinate of the first light source 10 is a place where x is the highest in the chromaticity diagram. Located in. That is, it substantially coincides with the point where x becomes the largest at the first chromaticity coordinate 11 and the outer peripheral portion 53. In the present embodiment, as shown in FIG. 3, the first chromaticity coordinate 11 is located at the point (x, y) = (0.73, 0.27).

In the present embodiment, the third chromaticity coordinate 31, which is the chromaticity coordinate of the third light source 30, is an extension line A extending a straight line connecting the first chromaticity coordinate 11 and the high color temperature point 52 in a direction in which x becomes smaller. Is drawn, and it is preferably located at a point where y is smaller than the point where the extension line A and the outer peripheral portion 53 intersect. In the present embodiment, as shown in FIG. 3, the point where the extension line A and the outer peripheral portion 53 intersect is a point where the wavelength exceeds 490 nm. Therefore, it is preferable that the third light source 30 has a peak wavelength of 490 nm or less. In the present embodiment, as shown in FIG. 3, the third chromaticity coordinate 31 is located at the point (x, y) = (0.07, 0.20) corresponding to the wavelength of 485 nm.

In the present embodiment, the fourth chromaticity coordinate 41, which is the chromaticity coordinate of the fourth light source 40, draws an extension line B extending from the first chromaticity coordinate 11 in the direction in which y increases along the outer peripheral portion 53. It is preferably located at the point where y is the largest at the intersection of the outer peripheral portion 53 and the extension line B. In the present embodiment, as shown in FIG. 3, the fourth chromaticity coordinate 41 is located at the point (x, y) = (0.30, 0.69) corresponding to the wavelength of 550 nm.

By determining the first, third, and fourth chromaticity coordinates in this way, three points of the first chromaticity coordinate 11, the third chromaticity coordinate 31, and the fourth chromaticity coordinate 41 are set on the chromaticity coordinate. The entire area of the black body locus 50 can be included in the region inside the triangle as the apex. That is, by varying the outputs of the first light source 10, the third light source 30, and the fourth light source 40, the illuminating device 1 can produce a wide range of colors including the low color temperature point 51 of the blackbody locus 50 and the high color temperature point 52. It becomes possible to create.

For example, when producing a single color such as red, green, or blue, any one of the first light source 10, the third light source 30, and the fourth light source 40 may be turned on. Further, when creating intermediate colors of red, green, and blue, only two of the first light source 10, the third light source 30, and the fourth light source 40 need to be turned on.

However, in order to produce light near the center in the chromaticity diagram, it is necessary to turn on all of the first light source 10, the third light source 30, and the fourth light source 40. , White. In this case, the output from the first light source 10 is higher than that of the third light source 30 to the fourth light source 40. The output here is, for example, a radiant flux (unit: mW). For example, the first light source 10 irradiates light having an output twice or more higher than that of the third light source 30 to the fourth light source 40. Then, the light emitted from the first light source 10, the third light source 30, and the fourth light source 40 is mixed to produce, for example, white. By irradiating with this control, the light from the first light source 10 is irradiated at a certain ratio or more, so that the effect that the original color of the object to be irradiated can be accurately recognized by the human eye, which will be described later, can be obtained. You can expect it.

Further, in the present embodiment, the fourth light source 40 has a peak wavelength of 490 nm or more and 550 nm or less, and may be composed of a combination of a solid-state light source such as an LED, LD, or OLED and a phosphor. That is, the fourth chromaticity coordinate 41 is located at a coordinate different from (x, y) = (0.30, 0.69) corresponding to the wavelength of 550 nm shown in FIG. Specifically, as the peak wavelength becomes smaller, the fourth chromaticity coordinate 41 moves along the outer peripheral portion 53 in the direction in which x becomes smaller. Further, by forming a combination of a solid-state light source and a phosphor, the half-value width of the spectrum becomes large, and the fourth chromaticity coordinate 41 moves from a point on the outer peripheral portion 53 of the chromaticity diagram in the direction in the chromaticity diagram. To do. In that case, while the lighting device 1 can produce a color close to bluish green or light having high color rendering properties, the color near the low color temperature point 51 of the blackbody locus 50 and the high color of the blackbody locus 50 There is a risk that the temperature point 52 cannot be created. Since it is not necessary to create the low color temperature point 51 and the high color temperature point 52 depending on the application of the lighting device 1, the light source to be used can be used properly according to the application.

Further, in the present embodiment, the light source device 2 includes a second light source 20, and the second chromaticity coordinate 21 which is the chromaticity coordinate of the second light source 20 is the first chromaticity on the chromaticity diagram. It is desirable to be located in the inner region of the triangle having the three points of the coordinates 11, the third chromaticity coordinate 31, and the fourth chromaticity coordinate 41 as the apex. By combining with the second light source 20, for all the correlated color temperatures that can be realized by the three light sources of the first light source 10, the third light source 30, and the fourth light source 40, the spectrum of various color rendering properties even at the same correlated color temperature It is possible to realize the distribution.

When the light source device 2 provided with the second light source 20 produces light (for example, white light) near the center in the chromaticity diagram with chromaticity coordinates different from the second chromaticity coordinate 21, the first light source. 10. It is created by mixing the light emitted from the second light source 20, the third light source 30, and the fourth light source 40. Even in this case, the output from the first light source 10 is higher than that of the third light source 30 to the fourth light source 40. The output here is, for example, a radiant flux (unit: mW). For example, the first light source 10 irradiates light having an output that is more than twice as high as that of the third light source 30 to the fourth light source 40. Since the light from the first light source 10 is irradiated at a certain ratio or more by controlling the irradiation, the effect of accurately recognizing the original color of the irradiated object with the human eye, which will be described later, can be expected. ..

Next, the movement of irradiating the object with the lighting device 1 will be described. The place where the object is irradiated by the lighting device 1 is, for example, a store (apparel, a beauty salon, a grocery store, etc.), a museum, or the like, but it may be used in a place other than these.

For example, as an example in this embodiment, a lighting device 1 having the spectrum shown in FIG. 4 is configured. The lighting device 1 having the spectrum shown in FIG. 4 includes an LED having a peak wavelength of 690 nm as the first light source 10, a white LED having a peak wavelength of 3000 K as the second light source 20, and an LED having a peak wavelength of 465 nm as the third light source 30. The fourth light source 40 includes an LED having a peak wavelength of 550 nm.

FIG. 5 shows, as an example of the present embodiment, the chromaticity of each light source of the lighting device 1 having the spectrum shown in FIG. The first chromaticity coordinate 11 is, for example, (x, y) = (0.73, 0.27). The second chromaticity coordinate 21 is, for example, (x, y) = (0.45, 0.41). The third chromaticity coordinate 31 is, for example, (x, y) = (0.13, 0.06). The fourth chromaticity coordinate 41 is, for example, (x, y) = (0.41, 0.51). In the present embodiment, the second chromaticity coordinate 21 is in a triangle composed of three points of the first chromaticity coordinate 11, the third chromaticity coordinate 31, and the fourth chromaticity coordinate 41, and is black. It is a point located on the body trajectory 50.

In the present embodiment, by changing the brightness of four types of light sources, the first light source 10, the second light source 20, the third light source 30, and the fourth light source 40, for example, light of 2800K, duv = 0.00. If so, it is possible to produce light of Ra85 to Ra95.

The first light source 10 is a red light source having a peak wavelength of 680 nm or more. By adding red light having a peak wavelength of 680 nm or more, it is possible to improve the visibility of colors such as skin color, red, and purple of an object even if the values of R1 to R15 and the value of duv are almost the same. , The effect of being able to more accurately identify the color and texture of the visual object by the human eye can be expected.

Here, the principle of being able to accurately identify the skin color of an object will be described by taking the skin color as an example. The color of an object identified by a human is related to the sensitivity of the human eye and the color emitted by the object (wavelength of light reflected by the object).

As information indicating the sensitivity of the human eye, what is called a color matching function is known. The color matching function indicates the spectral responsiveness corresponding to the human eye. The Commission Internationale de I'Eclairage (CIE) defines the sensitivity of the eye to the isoenergy spectrum as the spectral stimulation value, and this sensitivity curve as the color matching function. FIG. 6 is a diagram showing a color matching function. The color matching function has three curves z (λ), a curve y (λ) and a curve x (λ). Each curve is used as an index to quantify the color perceived by humans. In the color matching function shown in FIG. 6, the curve x (λ) has a relative value peak at the largest (longest) wavelength in the color matching function. In the curve x (λ) of the color matching function, a peak of a relative value is formed at the largest wavelength at a wavelength of about 600 nm. That is, in the color matching function, the longest wavelength at which the relative value peaks is about 600 nm. According to such a color matching function, in the wavelength region of 600 nm or more, the longer and larger the wavelength of light, the more difficult it is to quantify it as a color (that is, the contribution to the color matching function becomes smaller). ..

On the other hand, the color of an object perceived by a person depends not only on the spectral responsiveness corresponding to the human eye as represented by the color matching function, but also on the spectral reflectance (spectral reflectance coefficient) of the object. Generally, the appearance of colors is confirmed using a color chart. An example of a color chart is what is called a Macbeth chart. For example, the Macbeth chart (No. 2 of the Macbeth chart) shows a color tag as a human skin color. FIG. 7 is a diagram showing the spectral reflectance of the skin color shown in the Macbeth chart. According to FIG. 7, the spectral reflectance of the skin color has a large relative value between 580 nm and 780 nm. Therefore, by irradiating the skin color with a wavelength in the region where the relative value of the spectral reflectance is large, the reflected light increases, and the reflected light enters the human eye, so that the original color can be recognized more accurately. It becomes.

In the present embodiment, the contribution to the color matching function is very small, but by adding light of 680 nm or more, which has a high spectral reflectance of the skin color, by the first light source 10, the original color of the skin color can be accurately obtained. It is possible to convey it to the human eye. The same applies to red and purple, and the same effect can be expected as long as the reflectance is high in the wavelength region of 680 nm or more.

Similarly, the fourth light source 40 is a green light source having a peak wavelength of 490 nm or more and 550 nm or less, and by adding this light, the visibility of the green color of the object can be improved, and the hue of the visual object can be improved. And texture can be identified more accurately by the human eye. Further, the third light source 30 is a blue light source having a peak wavelength of 490 nm or less, and by adding this light, the blue visibility of the object can be improved, and the color and texture of the object can be improved. It can be identified more accurately by the human eye.

When the lighting device 1 of the present embodiment is used, for example, when irradiating an object containing red, a red first light source 10 is used, and when irradiating an object containing green, a green fourth light source 40 is used. When irradiating an object containing blue, it is possible to select and irradiate each of the blue third light sources 30. Of course, it is also possible to irradiate each of them in combination. For example, when irradiating an object containing red and blue, the red first light source 10 and the blue third light source 30 may be irradiated together. .. This makes it possible to irradiate light that can accurately identify each of the primary colors of red, blue, and green and their intermediate colors.

Since the conventional lighting device is mainly configured by focusing on red, it does not have a mechanism for adding blue or green, and when an object containing blue or green is irradiated, the visibility is improved only in red. There was a risk of being recognized unnaturally. Since the present embodiment includes a mechanism for adding blue or green, it is possible to irradiate an object containing blue or green with light that can be appropriately recognized.

In addition, when a plurality of lighting devices that have been configured by focusing on red are arranged in the same space, the light color varies depending on the individual LED elements and lot differences, and the adjacent lighting devices also delicately. There was a problem that the colors looked different. By adopting a toning structure in which the color can be adjusted as in the present embodiment, it is possible to improve the variation between the lighting devices.

As a structure in which the color can be adjusted, unlike the present embodiment, there is also a structure in which two colors of white light are combined to adjust the color. In this case, the two colors of white light, that is, the toning is performed on the straight line between the two coordinates. Therefore, if the variation between the lighting devices does not fit on this straight line, the variation in the light color can be improved. There was a risk that it could not be done. Further, since the blackbody locus is not a straight line, when the color is adjusted on this straight line, the light may deviate from the blackbody locus, resulting in a strange light. By adopting a structure in which color matching is performed between three or more coordinates instead of between two coordinates as in the present embodiment, color matching in the deviation direction is also possible. Therefore, it is possible to dimm the area that cannot be covered by a straight line, and it is also possible to adjust the color along the blackbody locus.

In the present embodiment, the first light source 10 is a red light source having a peak wavelength of 680 nm or more, and irradiates light having a small contribution to the color matching function and not having high luminosity factor. Therefore, when the lighting device 1 is toned, it is likely to be pulled in the direction of the third light source 30 or the fourth light source 40 having high visibility. In particular, when dimming along the blackbody locus, it is necessary to control the output of the first light source 10 to be stronger than that of the third light source 30 and the fourth light source 40.

Further, in general, a lighting device using an LED as a light source is often designed on the assumption that light of a color that can be quantified by a color matching function defined by CIE is reproduced. In other words, an LED-based lighting device designed to reproduce a light color that can be quantified by a color matching function is light with a wavelength in the visible range that is difficult to quantify by a color matching function (etc. It is not designed to output light of wavelengths that contribute less to the color function). That is, an LED-based lighting device designed for the purpose of reproducing a light color that can be quantified by a color matching function has a wavelength of light having a small contribution to the color matching function (for example, a wavelength of 680 nm or more). It is difficult to increase the output. In the present embodiment, the first light source 10 which is a red light source having a peak wavelength of 680 nm or more is provided, and it is possible to increase the output of light having a peak wavelength of 680 nm or more, which has a small contribution to the color matching function. As a result, the visibility of skin color, red color, and purple color can be improved, and the color and texture of the object can be more accurately identified by the human eye.

Next, the control system of the lighting device 1 will be described. The lighting device 1 may be switched, for example, by operating a button or a knob provided on the lighting device 1, or may be in a form in which lighting control is performed based on information of an object input from the outside. .. In the following, an example of a form in which information on an object is input from the outside will be described.

The information of the object input from the outside is, for example, image data such as actual image data or thermal image data acquired by a camera or sensor, reflectance information, color information, temperature information, displacement information, etc. It may be numerical data. In this case, as shown in FIG. 8, the lighting device 1 is provided with a receiving unit 60 for receiving the information of the object and a processing unit 70 for inputting the information of the object and determining the lighting control method.

The receiving unit 60 receives the information of the object transmitted from the outside. The lighting device 1 may be used to acquire information on the object. In that case, an acquisition unit 61 (not shown) such as a sensor or a camera for acquiring information on the object is arranged instead of the receiving unit 60. Further, both the receiving unit 60 and the acquiring unit 61 may be arranged. The information of the received or acquired object is output from the receiving unit 60 or the acquiring unit 61, and then passed to the processing unit 70.

The processing unit 70 includes, for example, a processor and a CPU, determines target chromaticity coordinates suitable for the object from the input information of the object, and determines a control method. Then, information or a signal including the control method is output from the processing unit 70, and then passed to the control unit 3. The control unit 3 controls the light source unit 2.

For example, we will introduce a case where human skin is selected as the object. Information on the skin color of the human being to be irradiated is acquired by the acquisition unit 61 of the lighting device 1, a sensor installed separately from the lighting device 1, a portable communication device, or the like. At this point, the acquired information may be actual image data, reflectance data, or may be converted into reflectance data based on the actual image data.

After that, the acquired information is passed to the processing unit 70. From the information, the processing unit 70 determines that it is suitable to increase the output of the light source in the wavelength region where the reflectance of the skin color is high, and calculates or selects the target chromaticity coordinates thereof. After that, the control method according to the target chromaticity coordinates is determined. Then, information or a signal including the control method is output. The control determination by the processing unit 70 is not limited to the one described above. For example, it may be determined to control the output of the light source so that the skin color has a specific chromaticity. In this case, the control policy may be controlled by registering the situation in which the lighting device 1 is used in advance.

Then, the information or signal is passed to the control unit 3, and the control unit 3 controls the light source unit 2 to control the lighting. In this series of lighting control, information and signals may be exchanged by wire or wirelessly.

In the processing by the processing unit 70, for example, when the input information of the object is actual image data, the spectral reflectance of the object is extracted to increase the emission intensity of the light source in the wavelength region having high spectral reflectance. It includes the steps of determining control and outputting control information. In addition, if the color temperature, color deviation, or Ra fluctuates by increasing the emission intensity of a specific wavelength, control is performed to change the emission intensity of a light source of another wavelength so as to cancel the fluctuation. It may be sandwiched.

The processing unit 70 may include a storage unit in which data in which the object and the control method are linked in advance are stored. In that case, the processing in the processing unit 70 includes a step of recognizing what the object is, a step of collating the recognized object state with the data of the storage unit and selecting a control method, and a step of outputting control information. You may become. Further, the processing unit 70 may be connected to the cloud server to search and collate the data on the cloud server.

Further, the receiving unit 60 and the processing unit 70 may be integrally formed, or the control unit 3 may also have the functions of the receiving unit 60 and the processing unit 70. Further, the processing in the processing unit 70 is performed on the cloud server, and the lighting device 1 does not have to include the processing unit 70. In this case, the information of the object is directly transmitted to the cloud server, processed by the cloud server, and the control information is transmitted to the lighting device 1. The control information is received by the receiving unit 60, and then the control unit 3 that has received the control information controls the light source unit 2.

By determining and controlling the control method in the processing unit 70 in this way, it is possible to save the trouble of checking the objects one by one with the human eye and adjusting the output of the light source. In addition, when judging with the human eye, there is a possibility that the light source may vary due to a slight difference in individual senses. It is possible to control this point without variation by determining it in the processing unit 70. Further, since the processing unit 70 can make a judgment and control the output of the light source to suppress the output of an unnecessary light source, the effect of suppressing energy consumption can be expected.

Next, the first modification will be described. The lighting device 1 of the first modification is shown in FIG. In the first modification, the light source device 2 includes a first light emitting unit 110, a second light emitting unit 120, a third light emitting unit 130, and a fourth light emitting unit 140. The light emitting unit here is a light emitting unit formed by gathering a plurality of light sources having different peak wavelengths. The arrangement of the light emitting parts is not limited to the form shown in FIG. 9, and for example, the light emitting parts may be formed in a band shape and arranged in a row, or may be formed in the smallest unit. The light emission may be arranged so as to be scattered in a staggered arrangement.

Light in which blue and white are mixed is emitted from the first light emitting unit 110. The first light emitting unit 110 is composed of, for example, a combination of two types of light sources, a second light source 20 and a third light source 30. Here, the second light source 20 is, for example, a white light source of 4300K, Ra90.

Light in which red and white are mixed is emitted from the second light emitting unit 120. For example, the first light source 10 and the second light source 20 are arranged in the second light emitting unit 120. Here. The second light source 20 is, for example, a 4300K, Ra90 white light source. In the second light emitting unit 120, the peak wavelength of the red light is not limited to 680 nm or more. For example, the second light emitting unit 120 may be composed of a combination of two types of light sources, a red light source having a peak wavelength of 610 nm or more and 680 nm or less, and a second light source 20.

Light of a color that is a mixture of green, blue, and white is emitted from the third light emitting unit 130. For example, a second light source 20, a third light source 30, and a fourth light source 40 are arranged in the third light emitting unit 130. Here, the second light source 20 is, for example, a white light source of 4300K, Ra90. In the third light emitting unit 130, the green light is not limited to a peak wavelength of 490 nm or more and 550 nm or less. Therefore, the third light emitting unit 130 may be composed of, for example, a combination of three types of light sources, a green light source having a peak wavelength of 490 nm or more and 580 nm or less, a third light source 30, and a second light source 20. ..

The fourth light emitting unit 140 irradiates light having a color that is a mixture of red, green, and white. For example, the first light source 10, the second light source 20, and the fourth light source 40 are arranged in the fourth light emitting unit 140. The second light source 20 here is, for example, a white light source of 4300K, Ra90. In the fourth light emitting unit 140, the peak wavelength of the red light is not limited to 680 nm or more. Further, the green light is not limited to a peak wavelength of 490 nm or more and 550 nm or less. Therefore, the fourth light emitting unit 140 is, for example, a combination of three types of light sources: a red light source having a peak wavelength of 610 nm or more and 680 nm or less, a green light source having a peak wavelength of 490 nm or more and 580 nm or less, and a second light source 20. It may be configured.

With this configuration, the chromaticity coordinates 111 of the first light emitting unit, the chromaticity coordinates 121 of the second light emitting unit, the chromaticity coordinates 131 of the third light emitting unit, and the chromaticity coordinates 141 of the fourth light emitting unit are chromaticity. It is the position of FIG. 10 on the figure. In the illumination device 1 in the first modification, the chromaticity coordinates 111 of the first light emitting unit, the chromaticity coordinates 121 of the second light emitting unit, the chromaticity coordinates 131 of the first light emitting unit, and the first light emitting unit It is possible to create the color of the region inside the quadrangle having the chromaticity coordinates 141 and the four points as vertices. Since this square area is composed of a mixture of red, green, blue, and white light in the light emitting portion, it is compared with the area created by monochromatic light of red, green, and blue as shown in FIG. Therefore, the area becomes small. That is, the range of colors that can be produced by the lighting device 1 of the first modification is narrower than that of the previously introduced embodiment.

In the first modification, the range of colors that can be produced by the lighting device 1 is narrowed, and the structure is such that monochromatic light such as blue, red, and green is not irradiated. Since monochromatic light may not be required for general lighting, in an environment where monochromatic light is not required, efficient lighting control is achieved by limiting the control area by using the lighting device 1 of the first modification. Is possible.
Further, with this structure, since white light is contained in any light emitting portion, dimming can be performed while obtaining high color rendering performance.

The white light used for each light emitting portion in the first modification preferably has a color rendering index of 90 or more. Further, it is preferable that the red and green light used for each light emitting portion in the first modification has a half width of 50 nm or more.

Further, in the first modification, the chromaticity coordinates 111 of the first light emitting unit, the chromaticity coordinates 121 of the second light emitting unit, the chromaticity coordinates 131 of the third light emitting unit, and the chromaticity coordinates 141 of the fourth light emitting unit. The rectangular region composed of four points is preferably configured to include the blackbody locus 50 within the region.
Further, the lighting device 1 in which the first modification and the first modification are combined may be configured.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other embodiments, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are also included in the scope of the invention described in the claims and the equivalent scope thereof.

1 Lighting device 2 Light source device 3 Control unit 10 1st light source 20 2nd light source 30 3rd light source 40 4th light source 60 Receiver 70 Processing unit

Claims (5)

A first light source that emits red light with a peak wavelength of 680 nm or more,
With a white light source
With a light source unit
It has a control unit that controls the light source;
An illumination device characterized in that the output from the light source unit is controlled according to the target chromaticity coordinates corresponding to the irradiation target object. The lighting device according to claim 1, wherein the target chromaticity coordinates refer to a database in which an object to be irradiated in the previous period and the target chromaticity coordinates in the previous period are linked one-to-one. The lighting device according to claim 1, wherein the target chromaticity coordinates are determined by a computer from information on an object to be irradiated. The lighting device according to any one of claims 1 to 3.
Further equipped with a processing unit that outputs target chromaticity coordinates;
A lighting system characterized in that the lighting device is controlled based on the target chromaticity coordinates output from the irradiation processing unit. With the step of inputting the information of the object into the processing unit and outputting the target chromaticity coordinates;
With the step of irradiating the object with light that matches the output target chromaticity coordinates;
Lighting methods including.

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