JP6252284B2 - Lighting system and lighting system unit - Google Patents

Description

Embodiments of the present invention relates to light emitted from the light source to the illumination system unit having an illumination system and a plurality of the illumination system for irradiating the illumination light.

  LED (Light Emitting Diode) lighting has been widely used as lighting with a low environmental load because of its energy saving and long life. Here, the light generated by the LED has a limited wavelength band as compared with sunlight, and therefore the color appearance may not be natural. The color appearance is evaluated by color rendering properties, for example, the average color rendering index Ra. However, the color appearance felt by humans depends not only on color rendering but also on brightness. This is called the Hunt effect. Although the hunting effect can be compensated for by increasing the illuminance extremely, it causes an increase in power (energy) consumption.

  For this reason, an illumination system or the like for realizing a well-balanced color appearance without excessively increasing the energy consumption has been studied. However, the illumination system and the like that have been studied in the past have an extremely complicated configuration.

  In a room where external light (sunlight) is inserted, the lighting environment changes with time. Further, for example, in an ordinary office or warehouse, the appearance of the same color as natural light is not required. Improving color appearance to an unnecessary level increases power consumption.

  In order to realize an illumination with an appropriate color appearance according to the lighting environment and the required level, a lighting system with a simple configuration is required.

JP 2013-201332 A

Embodiments of the present invention has an object to provide an illumination system unit having corresponding to the environment, a lighting system and a plurality of the illumination system of a simple structure capable of realizing a lighting appropriate color appearance level.

An illumination system according to an embodiment of the present invention includes a light source having a first light source that generates illumination light and a second light source that generates illumination light having higher color rendering properties than the first light source, and the illumination light from sunlight is superimposed light, a color information acquisition unit for acquiring the intensity of the light having the predetermined wavelength band which is not included in the illumination light to a wavelength band the solar light comprises the sun the illumination light Based on the brightness information acquisition unit for acquiring information indicating the brightness of the light on which the light is superimposed, and the information indicating the intensity of the light in the predetermined wavelength band and the brightness of the light, the illumination light is A control unit that improves color rendering by controlling the second light source when the color rendering value of the light on which the sunlight is superimposed is less than a predetermined value .

It is a block diagram of the illumination system of 1st Embodiment. It is a block diagram of the illumination system of the modification 1 of 1st Embodiment. It is a block diagram of the illumination system of the modification 2 of 1st Embodiment. It is a block diagram of the illumination system of the modification 3 of 1st Embodiment. It is a block diagram of the illumination system of 2nd Embodiment. It is a block diagram of the illumination system unit of 3rd Embodiment.

<First Embodiment>
As shown in FIG. 1, the illumination system 1 of the embodiment includes a light source 10, a color sensor 20 that is a color information acquisition unit, and a calculation unit that calculates a color rendering value as information indicating color rendering properties from the output of the color sensor 20. 25, a brightness sensor 30 that is a brightness information acquisition unit, a control unit 40 that controls the entire illumination system 1 including the light source 10, a storage unit 41, a setting unit 49, and a power source 50.

  For example, the light source 10 is disposed on the ceiling of a room to be illuminated, and the color sensor 20 and the brightness sensor 30 are disposed on a ceiling surface, a wall surface, a floor surface, or an operation remote controller that also serves as the setting unit 49. The other control units 40 and the like may be arranged in the back of the ceiling or in another room, for example, a central management room of a building.

  Although details will be described later, the setting unit 49 sets a condition for control by the control unit 40. The setting unit 49 may be set at the time of manufacture, or may be set by the user.

  The light source 10 generates pseudo white illumination light. The light source 10 combines yellow light and blue light by combining a blue LED 11 that emits blue light (for example, 380 nm to 470 nm) and a phosphor 12 that generates yellow light (for example, 570 nm to 585 nm) when receiving blue light. It includes an LED unit 13 that generates pseudo white light by mixing with light. The pseudo white light can efficiently generate strong light with low power consumption, but has a lower color rendering than white light (sunlight) from the sun 90.

  A light source composed of an LED that generates ultraviolet light and a phosphor that receives ultraviolet light and generates blue light, green light, and red light may be used. Moreover, the light source which consists of blue LED11, green LED (for example, 495 nm-570 nm), and red LED (for example, 600 nm-750 nm) may be sufficient.

  The color sensor 20 is a color filter that blocks light other than red light, green light, or blue light, that is, three types of illuminance sensors 21A covered with a red filter 20F1, a green filter 20F2, or a blue filter 20F3, Including 21B and 21C. The illuminance sensors 21A, 21B, and 21C are light receiving elements such as photodiodes that output an electrical signal corresponding to the intensity of incident light.

  The computing unit 25 calculates a color rendering value CR indicating color rendering properties from the intensities of red light, green light, and blue light output from the color sensor 20.

  For example, the red light intensity output by the illuminance sensor 21A when detecting light of a predetermined illuminance is LR, the green light intensity output by the illuminance sensor 21B is LG, and the blue light intensity output by the illuminance sensor 21C is LB. Then, the color rendering value CR is calculated from the following (Formula 1).

CR = (LR / LR0) + (LG / LG0) + (LB / LB0) (Formula 1)
However, LR0, LG0, and LB0 are output values of each sensor when sunlight with a predetermined illuminance is received.

  Since the color rendering value has a predetermined proportional relationship with the average color rendering index Ra, the color rendering value will be described below as the average color rendering index Ra. The calculation unit 25 does not need to be an independent component, and may be a CPU or the like incorporated in the color sensor 20, or the control unit 40 may have a function of the calculation unit.

  The brightness sensor 30 includes a light receiving element having the same function as the illuminance sensor 21 </ b> A of the color sensor 20. That is, the brightness sensor 30 outputs the intensity of white light as illuminance.

  When the illumination range is wide, a plurality of color rendering values and a plurality of illuminances are acquired from the plurality of color sensors 20 and the plurality of illuminance sensors 30, and the control unit 40 performs control using, for example, the average values thereof. You may go.

  The power source 50 supplies power to the light source 10 and the like. The power source 50 is, for example, a lighting device that converts a commercial power source into power necessary for the light source 10 and supplies the power. When the power (current) supplied from the power source 50 increases, the intensity of illumination light generated by the light source 10 increases. growing.

  The control unit 40 including a CPU or the like controls the entire illumination system 1 according to the setting of the setting unit 49.

  When the activation instruction by the user, that is, the power switch SW 48 is turned on, the control unit 40 controls the power supply 50 to supply power to the light source 10. Then, the light source 10 generates illumination light. Hereinafter, the control unit 40 "controls the power supplied from the power supply 50 to the light source 10" is referred to as "controls the light source".

  The illumination state by the illumination system 1 changes due to a change with time of the light source 10 or a temperature. First, the control unit 40 feedback-controls the electric power supplied to the light source 10 so that the illuminance (brightness) output from the illuminance sensor 30 becomes a predetermined value set by the setting unit 49. At the time of activation, the control unit 40 may supply predetermined power set in advance to the light source 10 instead of feedback control.

  Next, the control unit 40 increases or decreases the power supplied to the light source 10 by a predetermined amount based on the color rendering value calculated by the calculation unit 25 based on the output of the color sensor 20. For this reason, the illumination light can achieve a desired color appearance level, although the color rendering properties hardly change. The control pattern such as the power increase / decrease amount performed based on the color rendering value is stored in the storage unit 41. The control pattern is a table of the power increase / decrease amount corresponding to the color rendering degree, or the color rendering value and power. It is stored in the form of a relational expression with the amount of increase / decrease.

  In the illumination system 1, the control unit 40 controls the light source 10 based on the control pattern stored in the storage unit 41 according to the color rendering value. That is, the control method of the light source 10 is switched from feedback control or constant power control based on the output of the illuminance sensor 30 to pattern control based on a predetermined control pattern based on the color rendering value. In this color rendering priority pattern control, as will be described later, the value output from the illuminance sensor 30, that is, the brightness of the illumination light may increase, but may decrease.

  In pattern control giving priority to color rendering properties, for example, when the color rendering properties of the light source 10 are in the range of 65 to 85, the control unit 40 supplies power supplied to the light source 10 when the color rendering value is less than 70 corresponding to Ra. (Current value) is controlled to increase by 5%. If it is 70 to 85, the brightness is controlled to be a predetermined value without increasing or decreasing the output. If it is 85 or more, the brightness is decreased by 5% and 95 or more. In the case of, control is performed so as to decrease by 10%.

  Even if the illuminance increases, the color rendering does not change. However, the color appearance level can be improved by the hunt effect. In addition, when the color rendering level is high and the color appearance level can be secured to some extent even when the illuminance is reduced, the power consumption can be reduced.

  The control content determined after the activation may be stored in the storage unit 41, for example, and may be an initial set value at the next activation. Further, priority setting may be performed by the setting unit 49. In this case, in the case of brightness priority setting, pattern control based on the color rendering value is not performed. Further, when energy saving is not so important, control for reducing power is not performed even if the color rendering value is equal to or greater than a predetermined value.

  Further, in the lighting system 1, when the work content is set by the setting unit 49, the control unit 40 controls the light source 10 according to the work content. The work content set by the setting unit 49 includes, for example, article sorting work, office work, design, PC work, and exhibition. These work contents are set according to the place of use such as an office, an exhibition hall, or a warehouse. When the work content is not set, the control unit 40 controls, for example, office work as a standard use place.

  For example, in the case of exhibition setting, when the color rendering value is equivalent to Ra and less than 70, the control unit 40 controls the power supplied to the light source 10 to increase by 25%, and when it is less than 80, 10% Control is performed so as to increase, and if it is less than 90, it is controlled to increase 5%, and if it is 95% or more, it is controlled to decrease 5%.

  That is, in the display setting, the light source 10 is controlled so that the color appearance level is higher than that in the office work setting.

  On the other hand, in the case of setting the sorting operation of articles such as warehouses, the control unit 40 controls the power supplied to the light source 10 to increase by 5% only when, for example, the color rendering value is less than 70 corresponding to Ra. To do.

  That is, in the warehouse, the light source 10 is controlled so that the color appearance level is lower than in the office.

  The lighting system 1 can always appropriately manage the color appearance level by simply increasing or decreasing the power supplied to the light source 10 according to the color rendering value at the time of activation.

  Here, the illumination environment is often affected by outside light (sunlight). In this case, since sunlight is superimposed on the illumination light from the light source 10 in the daytime, the color rendering is higher than that at night. Furthermore, the color rendering properties of light including illumination light, that is, light in which sunlight is superimposed on the illumination light, changes with time due to weather, the position of the window, the size of the window, and the altitude of the sun.

  For this reason, it is particularly preferable that the control unit 40 controls the light source 10 in accordance with the environment at that time in the same manner as at startup at a predetermined time interval, for example, every 10 minutes. For example, the control interval is preferably 1 minute or more and 1 hour or less. Above the range, frequent illumination changes do not occur, so the user does not feel uncomfortable, and if it is below the range, appropriate control according to the situation is possible.

  In the illumination system 1, the control unit 40 periodically controls the light source 10 so as to obtain an appropriate color appearance level according to the situation at that time.

  In addition, although the above demonstrated the illumination system 1 which comprises a light source, the illumination control system 9 of the illumination system 1 can also be used with respect to the existing light source.

  For example, the illumination control system 9 of the embodiment includes a color information acquisition unit that acquires a color rendering value indicating color rendering from the intensity of light in a predetermined wavelength band, a brightness information acquisition unit that acquires light brightness, and the color rendering And a control unit that controls the light source at predetermined time intervals based on the value and the brightness.

<Modification>
Next, lighting systems 1A to 1C according to Modifications 1 to 3 of the first embodiment will be described. Since the lighting systems 1A to 1C are similar to the lighting system 1, components having the same function are denoted by the same reference numerals and description thereof is omitted. As will be described later, the lighting systems 1 to 1C have the effects of the lighting system 1 and further have their own effects.

<Modification 1>
As shown in FIG. 2, the illumination system 1A of the first modification includes N light sources 10A1 to 10AN. Here, N is an integer of 2 or more. Hereinafter, when referring to a plurality of components having the same function, the last numeral is omitted. For example, each of the light sources 10A1 to 10AN is referred to as a light source 10A. In the following figures, the sun 90 may not be displayed.

  The illumination system 1 </ b> A illuminates a wider area than the illumination system 1 by the plurality of light sources 10 </ b> A to 10 </ b> AN having the same configuration as the light source 10.

  Moreover, in order to eliminate the difference in the illumination state depending on the illumination location, the illumination system 1A includes two illuminance sensors 30A1 and 30A2 and two color sensors 20A1 and 20A2. Note that the number of illuminance sensors 30A and the like is appropriately obtained and selected according to the area of the illumination location. That is, the number of illuminance sensors 30 and the like may be at least greater than the number of light sources 10A, and conversely, there may be one.

  In the case of having a plurality of illuminance sensors 30A and the like, the control unit 40A may perform control based on the average value of the plurality of color rendering values calculated by the calculation unit 25A, or according to the arrangement of the illuminance sensors 30A and the like. Thus, control may be performed by weighting a plurality of illuminance sensors.

  Furthermore, the control unit 40A may control the power supply 50A so that the plurality of light sources 10A1 to 10AN are in different power supply states. For example, when the color rendering value is equivalent to Ra and less than 70, the control unit 40A controls the power supplied to the light source 10A1 to increase by 25%, whereas the power supplied to the light source 10A2 is 20%. Control may be performed such that the power supplied to the light source 10AN is increased by 15%.

  The lighting system 1A has the effect of the lighting system 1, and can illuminate a wider range with an appropriate color appearance level in one system.

<Modification 2>
The color sensor 20B of the illumination system 1B of Modification 2 acquires the intensity of light in a wavelength band that is in the visible light wavelength band and is not included in the light generated by the light source 10.

  As shown in FIG. 3, in the illumination system 1B, the color sensor 20B includes an illuminance sensor 21A that detects red light, and does not include an illuminance sensor 21B that detects green light and an illuminance sensor 21G that detects blue light. Here, as the illuminance sensor 21A for detecting red light, for example, a sensor that detects a wavelength body of 700 nm or more, preferably a sensor that detects a wavelength band of 750 nm or more or near infrared rays is desirable. Red light, particularly a wavelength band of 700 nm or more, is included in sunlight, but is hardly included in illumination light generated by the pseudo-white light source 10. For this reason, the color sensor 20B can detect the brightness of sunlight separately from the brightness of the illumination light from the light source 10.

  As already explained, the color rendering of sunlight is very good. For this reason, illumination light on which more sunlight is superimposed has good color rendering, and illumination light on which sunlight is not superimposed has poor color rendering, that is, color rendering and brightness of sunlight (lightness). ). For this reason, the control based on the illuminance of sunlight has the same effect as the control based on the color rendering value.

  For example, if the red light intensity output from the illuminance sensor 21A is LR, the color rendering index CRB is calculated from the following (Equation 2).

CRB = (LR / LR0) (Formula 2)
However, LR0 is an output value of the illuminance sensor 21G when sunlight is received.

  The controller 40B increases or decreases the power supplied to the light source 10 based on the color rendering value of sunlight output from the color sensor 20B and the illuminance value of the illuminance sensor.

  The lighting system 1B has the effects of the lighting system 1, and further has a simple configuration and is easy to control.

Note that the lighting system 1B may include a plurality of light sources in the same manner as the lighting system 1A.
<Modification 3>

  As illustrated in FIG. 4, the illumination system 1 </ b> C according to the third modification includes an imaging unit 60 including an image sensor such as a CMOS that acquires an image of the illumination target area. In the illumination system 1 </ b> C, the control unit 40 </ b> C including the CPU having the functions of the color information acquisition unit and the brightness information acquisition unit performs color rendering value or saturation, illuminance or Get brightness and. Of course, the lighting system 1C may include a dedicated image processing unit that calculates saturation and luminance.

  When there is an imaging device for another purpose, for example, indoor monitoring, the illumination system 1C does not have to include an imaging unit, and the control unit 40C is used by using an image captured by the indoor monitoring imaging device. However, saturation and luminance may be calculated.

  In addition, the saturation and luminance may be calculated from only a part of the image, or the saturation and luminance may be calculated for each of a plurality of regions of the image, and the control unit 40C may control the average value or the like. May be performed. Note that the area for calculating the saturation and luminance is set by the setting unit 49.

  The lighting system 1C has the effects of the lighting system 1, and further, since the control unit 40C performs control based on a wider range of color rendering, it is less susceptible to local lighting unevenness or shadows of passers-by.

Second Embodiment
Since the illumination system 1D of the second embodiment is similar to the illumination system 1 and the like, the same components are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 5, the light source 10D of the illumination system 1D is a combination of a blue LED 11 that emits blue light and a yellow phosphor 12 that absorbs blue light and generates yellow light. In addition to the first LED unit 13 that generates pseudo white light mixed with and the like, the second LED unit 14 that is configured by a red LED that generates red light is included. The second LED unit 14 improves the color rendering by adding red light to the light emitted from the first LED unit. Moreover, you may comprise a 2nd LED unit using the pseudo white light source whose color rendering property is higher than a 1st LED unit. Further, the second LED unit may be configured by red LED, green LED, and blue LED, or the second LED unit may be configured by combining red LED, green LED, blue LED and pseudo white light. . In other words, the color rendering property may be improved by adding to the light emitted from the first LED unit by the second LED unit.

  The light source 10 </ b> D that generates blue light, yellow light, and red light generates illumination light with better color rendering than the light source 10. However, the luminous efficiency of the red LED 14 as the second LED unit is lower than the luminous efficiency of the first LED 11. For this reason, if the red LED 14 is always lit, power consumption is large.

  In the illumination system 1D, the control unit 40D performs control in the first illumination mode that supplies power only to the first LED 11 of the light source 10D at the time of activation. And control part 40D performs control in the 2nd illumination mode which supplies electric power also to red LED14, when a color rendering value is less than predetermined value. That is, the control unit 40D does not light the second LED unit 14 when the color rendering value is equal to or greater than a predetermined value.

  The illumination system 1D performs illumination with low power in the first illumination mode at the time of startup or the like, and generates illumination light with actually good color rendering in the second illumination mode only when the color rendering is low. The color appearance level can be improved reliably.

  The illumination system 1D may include a plurality of light sources as in the illumination system 1A, and may further include a color sensor having the configuration of the illumination system 1B, as in the illumination system 1C. The color rendering value may be acquired using an image.

  In addition, it cannot be overemphasized that the illumination control system of the illumination system 1A demonstrated so far from the illumination system 1D can be used also with respect to the existing light source similarly to the illumination control system 9. FIG.

<Third Embodiment>
As shown in FIG. 6, the illumination system unit 2 of the third embodiment includes two illumination systems 1E1 and 1E2. Each illumination system 1E has the same configuration as any of the illumination systems 1, 1A to 1D already described.

  The control unit 40E1 of the illumination system 1E1 controls the light source 10E1 using the color rendering value and brightness of the illumination system E2 as auxiliary information. Similarly, the control unit 40E2 of the illumination system 1E2 controls the light source 10E2 using the color rendering and brightness of the illumination system 1E1 as auxiliary information.

  Here, the auxiliary information is information used as, for example, a correction coefficient of the color rendering value acquired from the color sensor 20E1. When the color rendering value of the lighting system E2 is lower than the predetermined value, the color rendering value of the lighting system E1 is multiplied by one or more correction coefficients, and the control unit 40E1 supplies more power to the light source 10E1. To control.

  This is because the color appearance level perceived by the user increases or decreases depending not only on the lighting conditions in the vicinity, but also on the lighting conditions in remote areas illuminated by other lighting systems. Since the control unit 40E of the illumination system unit 2 controls the light source 10E using the illumination state of the distant area as auxiliary information, it is possible to appropriately control the color appearance level in a wide space.

Needless to say, the illumination system unit 2 may include three or more illumination systems. Moreover, according to the arrangement | positioning state of a lighting system 1E, a distance, etc., you may weight and control auxiliary information from another lighting system 1E. In other words, the control places more importance on the information from the nearby lighting system 1E than the information from the far lighting system 1E.
In each of the above embodiments, the case where the color rendering value acquired by the color information acquisition unit is controlled as the color rendering property has been described. In addition, the light source may be controlled.

  Table 1 shows an example of a table in which RGB intensity ratios are associated with brightness.

In Table 1, for example, when the intensity ratio of RGB is 6: 4: 1, 200 lx is set as the target illuminance value , and when the RGB intensity ratio is 2: 2: 2, the target illuminance value is 600 lx. . Conversely, when the illuminance is 200 lx, the RGB intensity ratio may be controlled to be 6: 4: 1 by controlling the color rendering property to be improved.

  Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the spirit of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 1, 1A-1E ... Lighting system 2 ... Lighting system unit 9 ... Lighting control system 10 ... Light source 11 ... Blue LED
12 ... Phosphor 13 ... LED unit 14 ... Red LED as second LED unit
20 ... Color sensor 25 ... Calculation unit 30 ... Illuminance sensor 40 ... Control unit 41 ... Storage unit 49 ... Setting unit 50 ... Power source 50 ... Color sensor 60 ...・ Image pickup part 90 ... the sun

Claims (6)

A light source having a first light source that generates illumination light and a second light source that generates illumination light having higher color rendering than the first light source;
From the light sunlight illumination light is superimposed, a color information acquisition unit for acquiring the intensity of the light having the predetermined wavelength band which is not included in the illumination light to a wavelength band the solar light comprises,
A brightness information acquisition unit for acquiring information indicating the brightness of light in which the sunlight is superimposed on the illumination light ;
Based on the information indicating the intensity of light in the predetermined wavelength band and the brightness of the light, when the color rendering value of the light in which the sunlight is superimposed on the illumination light is less than a predetermined value, the second And a control unit that improves color rendering by controlling a light source.   The illumination system according to claim 1, wherein the control unit controls the light source at predetermined time intervals. The brightness information acquisition unit is a brightness sensor;
The illumination system according to claim 1, wherein the color information acquisition unit includes the brightness sensor covered with a color filter that blocks light other than the light in the predetermined wavelength band . The illumination system according to claim 1, wherein the color information acquisition unit includes three types of brightness sensors each covered with a red color filter, a green color filter, and a blue color filter . The color information acquisition unit and the brightness information acquisition unit acquire information indicating the color rendering property and information indicating the brightness from an image of a target area illuminated by the light source. The lighting system described. A plurality of illumination systems according to any one of claims 1 to 5,
The lighting system unit, wherein the control unit of each of the lighting systems controls each of the light sources .

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