KR20230003802A - Lighting device - Google Patents

Abstract

The present invention provides an indoor lighting that, like the sunlight outside, increases a work concentration during the day and reduces a sleep-inhibiting effect at night. Accordingly, a lighting device according to one aspect of the present invention comprises: a first LED package having a light emitting peak in a first wavelength area and the second wavelength area; a second LED package having the light emitting peak in the first wavelength area; and a control part that varies a relative intensity of the light emitting peak existing in the second wavelength area based on an intensity of the light emitting peak existing in the first wavelength area on a light spectrum.

Description

Lighting device {LIGHTING DEVICE}

The present invention relates to a lighting device, and more particularly, to an indoor lighting device that controls a user's biorhythm.

Recently, LED lighting has become a popular trend. An LED, that is, a light emitting diode, refers to a device that generates injected minority carriers (electrons or holes) by using a p-n junction structure of a semiconductor and emits a predetermined light by recombination thereof. There are red light emitting diodes, green light emitting diodes using GaP, etc., blue light emitting diodes using an InGaN/AlGaN double hetero structure, and the like.

A recent light emitting device for lighting implements white light by combining a light emitting diode chip and a phosphor mold. For example, by disposing a phosphor on top of a light emitting diode chip that emits blue light, white is obtained by the blue light emission of the light emitting diode chip and the yellow green or yellow light emission of the phosphor. That is, white light is implemented by a combination of a blue light emitting diode chip made of a semiconductor component emitting light of 430 nm to 480 nm wavelength and a phosphor that generates yellow-green and yellow light using blue light as an excitation source.

However, side effects of blue light from a light emitting device for lighting that emits white light have recently been reported. It is known that blue light disrupts the circadian rhythm and destroys the sleep cycle. Accordingly, prior art literature discloses a human-friendly lighting device that controls overall color temperature by driving a first light emitting device having a relatively short emission peak wavelength and a second light emitting device having a relatively long emission peak wavelength, respectively.

However, prior art documents set the color temperature of the first light emitting element very low and control the light emitting element by lowering the overall color temperature in a nighttime environment, so it may be helpful in activating melatonin, but when concentration is required in a daytime work environment. has a problem that its concentration can rather be lowered compared to general lighting.

Furthermore, the relative intensity of the two emission peaks present in the blue series in the second light emitting device or the entire lighting module of the prior art document is similarly distributed to each other, but the relative intensity of the emission peak on the side with a relatively long wavelength is formed larger There is a problem. In this case, although the melatonin suppression effect is expressed during the day, the melatonin activation effect at night is reduced, and energy efficiency is lowered due to light emission with a relatively shorter wavelength.

In this strict sense, human-friendly lighting should maximize concentration during the day by suppressing melatonin secretion and optimize sleep induction by maximizing melatonin secretion at night, but detailed research is still lacking.

No. 10-2020-0113133 (October 6, 2020), title of invention: white light emitting module {WHITE LIGHT EMITTING MODULE}

The present invention is to solve the above problems of the prior art, and an object of the present invention is to provide indoor lighting that increases work concentration during the daytime and reduces the sleep-inhibiting effect at night, like outdoor sunlight.

A lighting device according to an aspect of the present invention includes a first LED package having emission peaks in a first wavelength region and a second wavelength region, a second LED package having an emission peak in the first wavelength region, and an optical spectrum in the first wavelength region. and a controller for varying the relative intensity of the emission peak present in the second wavelength region based on the intensity of the emission peak present in the second wavelength region.

In this case, the first wavelength region may be formed at 400 to 470 nm, and the second wavelength region may be formed at 470 nm to 490 nm.

In addition, the relative intensity of a peak existing in the second wavelength region of the second LED package on the light spectrum may be smaller than the relative intensity of the emission peak existing in the first wavelength region.

Also, the second LED package may have a color temperature of 1800 to 6500K.

In addition, the relative intensity of the emission peak existing in the second wavelength region based on the emission peak intensity of the first wavelength region existing in the first LED package may be 1.2 to 2.0.

In addition, the first LED package may have a color temperature of 4000 to 6500K.

Also, the control unit may change the color temperature of the entire indoor lighting device by varying the relative intensity of the emission peak in the second wavelength region based on the emission peak intensity in the first wavelength region.

In addition, the first LED package may have one peak wavelength in each of the first wavelength region and the second wavelength region, and the peak wavelength of the second LED package may exist only in the first wavelength region.

The indoor lighting device may further include an input unit for inputting a natural light mode or a special mode, and the controller may vary the relative intensities of the first wavelength emission peak and the second wavelength emission peak according to an input value.

In addition, when the natural light mode is input, the controller may divide the time from sunrise to sunset into a set number of sections, and set the color temperature variation in each section differently.

In addition, the set number of sections is formed of three sections, the amount of change in color temperature in the first section of the three sections is greater than the amount of change in color temperature in the second section, and the amount of change in color temperature in the third section is formed in the first section. It may be larger than the amount of color temperature change in the section.

The indoor lighting device may further include a communication unit or storage unit, and the communication unit or storage unit may receive or store sunrise and sunset times.

In addition, the first LED package and the second LED package are formed in plural, and the control unit may determine the driving number or applied current of the first LED package and the second LED package.

Meanwhile, a lighting device according to another aspect of the present invention includes a first LED package having a wavelength peak of a first wavelength and a wavelength peak of a second wavelength, and a second LED having a wavelength peak of a first wavelength and not having a wavelength peak of a second wavelength. and a control unit for controlling overall color temperature by varying the emission peak intensity of the second wavelength based on the emission peak intensity of the first wavelength on the package and light spectrum.

The lighting device according to the present invention adjusts the relative intensity of the first wavelength region and the second wavelength region to maximize the change in M/P ratio, thereby increasing work concentration during the day and reducing the sleep-inhibiting effect at night.

1 is a configuration diagram of a lighting device according to an embodiment of the present invention.
2a and 2b are cross-sectional views of a first LED package and a second LED package constituting the light source unit in FIG. 1 , respectively.
FIG. 3 is a diagram illustrating a light spectrum of the first LED package of FIG. 2 .
FIG. 4 is a diagram illustrating a light spectrum of the second LED package of FIG. 2 .
5A to 5D are diagrams illustrating changes in light spectrum with time when the lighting device according to an embodiment of the present invention is driven in a natural light mode.
6A to 6D are diagrams illustrating light spectra when the lighting device according to an embodiment of the present invention is set to a daily mode, a rest mode, a concentration mode, and a night activity mode, respectively.
7A to 7B are diagrams illustrating light spectrum changes when the lighting device according to an embodiment of the present invention is set to a weather mode.
8 is a diagram illustrating a light spectrum change when the lighting device according to an embodiment of the present invention is set to a sleep inducing mode.

Hereinafter, with reference to the accompanying drawings, an embodiment of the present invention will be described in detail so that those skilled in the art can easily implement it. Since the present invention can have various changes and various embodiments, it will be described in detail by exemplifying specific embodiments in the drawings. However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers, such as first and second, may be used to describe various components, but the components are not limited by the terms. These terms are only used for the purpose of distinguishing one component from another.

For example, a first element may be termed a second element, and similarly, a second element may be termed a first element, without departing from the scope of the present invention. The terms and/or include any combination of a plurality of related recited items or any of a plurality of related recited items.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which the present invention belongs. Terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with the meaning in the context of the related art, and unless explicitly defined in the present application, they should not be interpreted in an ideal or excessively formal meaning. don't

Hereinafter, a lighting device according to an embodiment of the present invention will be described. 1 is a configuration diagram of a lighting device according to an embodiment of the present invention, FIGS. 2A and 2B are cross-sectional views of a first LED package and a second LED package constituting a light source unit in FIG. 1, and FIG. 3 is a diagram. 2 is a diagram showing the light spectrum of the first LED package, and FIG. 4 is a diagram showing the light spectrum of the second LED package of FIG.

Referring to the drawings, a lighting device 1000 according to an embodiment of the present invention largely consists of a light source unit 100 and a control unit 200 that controls driving of the light source unit 100, and as shown in FIG. 1, a storage unit 300, an input unit 400 and a communication unit 500 may be further included.

First, the light source unit 100 according to this embodiment is composed of at least one first LED package 110 and at least one second LED package 120 . At this time, the first LED package 110 and the second LED package 120 include substrates 111 and 121, LED bare chips 113 and 123, and phosphors 114 and 124, and reflectors 112 and 122 are further included as shown. can include In this case, the substrates 111 and 121 and the reflectors 112 and 122 of the first LED package 110 and the second LED package 120 may be formed identically.

The substrates 111 and 121 may be formed of linear, circular, or polygonal plates. In this embodiment, the substrates 111 and 121 are connected to the LED bare chips 113 and 123 through wiring or electrically connected through a soldering part (not shown), and separately may not have a bonding wire of The soldering part may be formed by surface mount technology (SMT).

By the way, in this embodiment, the first LED package 110 suppresses melatonin to play a role of providing vitality to the user, so in addition to the bare chip 1a (113a) for emitting white light, another wavelength range is provided. It is characterized in that it further includes a bare chip 1b (113b) emitting light.

Here, the bare chip 1a (113a) emits light of 400 to 470 nm (referred to as 'first wavelength region', hereinafter the same), and the bare chip 1b (113b) emits light of 470 to 490 nm (referred to as 'second wavelength region'). Same below). Furthermore, referring to FIG. 3 , the ratio of the intensity of the emission peak in the second wavelength region to the intensity of the emission peak in the first wavelength region is 1.2 to 2.0.

At this time, when the intensity ratio of the luminescence peak is less than 1.2, light in the first wavelength region is widely recognized and sufficient melatonin suppression effect is not generated. This is because the inhibitory effect is saturated.

In more detail, in this embodiment, even if the target color temperature is calculated by mixing the light emitted from the second LED package 120 to be described later with the light emitted from the first LED package 110, the first LED package 110 has Since the melatonin inhibitory effect may decrease as the wavelength peak in the first wavelength region remains and is irradiated to the user, as described above, the peak intensity of the second wavelength region is compared to the peak intensity of the first wavelength region, which is the wavelength region of basic white light. It is highly desirable to set the ratio of strength.

At this time, the phosphor 114 is included in the first LED package 110 as shown in FIG. 2A. As shown, the phosphor 114 excites the light emitted from the LED bare chip 113 to emit white light. The phosphor 114 may be prepared mainly with a phosphor (Y) having a wavelength of excitation and emission being yellow as a main component, and red (R)-based or green (G)-based phosphors 114a and 114b may be used. On the other hand, the phosphor 114 is formed to be distributed in a known resin matrix to cover the bare chip 113, and the final emitted light has a color temperature of 4000 to 6500K for the melatonin suppression effect of the first LED package 110. It is desirable to do so.

Meanwhile, the second LED package 120 activates melatonin to help rest and sleep. As shown in FIG. 2B, the second LED package 120 also includes a substrate 121, a bare chip 2 123, and a phosphor 124 similarly to the first LED package 110, and includes a reflector ( 112,122) may be further included.

Here, the bare chip 2 123 emits light having an emission peak in a first wavelength region (400 to 470 nm). Also, as shown in the drawing, two bare chips 123 emitting the same light may be formed to control the current by the above-described control unit and secure color uniformity. In addition, since the second LED package 120 is involved in the activation of melatonin, when a bare chip having an emission peak in the second wavelength region is further included, the relative intensity of the peak existing in the second wavelength region on the optical spectrum is It is preferable to form less than the relative intensity of the emission peak existing in the 1-wavelength region. Furthermore, for melatonin activation, the phosphor 124 in the second LED package 120 is preferably set so that final light having a color temperature lower than that of the phosphor 114 in the first LED package 110 is emitted. Accordingly, the color temperature of the final emitted light of the second LED package 120 preferably has a range of 1800 to 6500K.

Meanwhile, the controller 200 controls the color temperature of the entire lighting device by controlling the first LED package 110 and the second LED package 120 respectively. However, in the lighting device according to an embodiment of the present invention, the color temperature of the entire lighting device is varied by varying the relative intensity of the emission peak in the second wavelength region based on the emission peak intensity in the first wavelength region. When the driving current ratio of the first LED package 110 and the second LED package 120 is adjusted according to the relative intensity of the light emission peak, a higher level of M/P ratio change is possible, suppressing melatonin similar to natural light or activation effect can be derived.

Hereinafter, a lighting device according to an embodiment of the present invention will be described in more detail. The lighting device according to the present embodiment has a natural light mode or a selection mode according to the input of the input unit 400 .

The natural light mode will be described with reference to FIGS. 5A to 5D. 5A to 5D are diagrams illustrating changes in light spectrum with time when the lighting device according to an embodiment of the present invention is driven in a natural light mode.

The natural light mode performs a function of maximizing the melatonin effect by designating a specific time period, and changes the color temperature of the entire lighting device from 3000 (or 4000) to 6500K for each scheduled time period.

In the natural light mode, the controller 200 divides the time from sunrise to sunset into a set number of sections, and sets different color temperature increments and decreases in each section. It is important to continuously change the color temperature from waking up to going to bed to activate melatonin, but the effect of activating melatonin increases even more when the color temperature change rate varies according to the interval.

At this time, the set number of sections is formed of three sections from the time from waking up to going to bed, and the color temperature change in the first section (eg, 7:00 to 12:00) of the three sections is the second section (eg, 7:00 to 12:00). For example, it is most preferable that the color temperature change in the third period (eg, 18:00 to 24:00) is larger than the color temperature change in the first period. Do.

In the third section, the greatest change in color temperature before going to bed is required for the smooth synthesis of melatonin. In addition, this is because it is preferable that the amount of change in the first section is set smaller than the amount of change in the third section in order to facilitate daytime activities.

Detailed embodiments of the natural light mode are described in [Table 1] below.

hour 7 o'clock 12 o'clock 18 o'clock 24 hours color temperature 6500K 6000K 5700K 4000K package driven
ratio package 1 100% 90% 70% 0% package 2 0% 10% 30% 100% product brightness 100% 100% 100% 100%

Referring to FIG. 5A, which is an emission spectrum at 7 o'clock set as the wake-up time, the peak intensity of the second wavelength region is set to 1.2 to 2.0 compared to the peak intensity of the first wavelength region, and the color temperature is set to 6500K. This leads to a strong inhibitory effect on melatonin secretion.

In addition, referring to FIG. 5B, which is an emission spectrum at 12:00 noon, which is lunchtime, the peak intensity of the second wavelength region is set to 1.2 to 2.0 compared to the peak intensity of the first wavelength region, and the color temperature is set to 6000K. As a result, while a strong inhibitory effect on melatonin secretion is continuously derived, the relief of melatonin suppression begins.

In addition, referring to FIG. 5C , which is an emission spectrum at 6:00 PM in the evening, the peak intensity of the second wavelength region is set to 0.8 to 1.6 compared to the peak intensity of the first wavelength region, and the color temperature is set to 5700K. In this case, melatonin activation begins in earnest while functioning as an active light necessary for work according to the remaining white light.

Then, referring to FIG. 5D of the emission spectrum at 24:00 pm, a bedtime, the peak intensity of the second wavelength region is set to 0.3 or less compared to the peak intensity of the first wavelength region, and the color temperature is set to 4000K. In this case, since no peak is generated in the second wavelength region, a sleeping environment is created.

On the other hand, in the case of the selection mode, daily mode, rest mode, concentration mode, night activity mode, and sleep induction mode may be input, and the control unit determines the relative luminescence peak of the first wavelength and the luminescence peak of the second wavelength according to the input. change the intensity.

6A to 6D are diagrams showing the light spectrum when the lighting device according to an embodiment of the present invention is set to a daily mode, a rest mode, a concentration mode, and a night activity mode, respectively, and FIGS. 8 is a diagram showing a light spectrum change when the lighting device according to an embodiment of the present invention is set to a wake-up mode, and FIG. 8 is a light spectrum when the lighting device according to an embodiment of the present invention is set to a sleep induction mode. It is a diagram showing the change.

Detailed embodiments of these selection modes are described in [Table 2] and [Table 3] below.

drive mode daily mode rest mode concentration mode night activity mode color temperature 5700K 4000K 6500K 5000K package
Driving
ratio package 1 70% 0% 100% 50% package 2 30% 100% 0% 50% product brightness 100% 70-80% 100% 100%

drive mode wake up mode sleep induction mode color temperature 5000K → 6500K 4000K package driven
ratio package 1 70% → 100% 0% package 2 30% → 0% 100% product brightness 10% → 100% (takes 30 minutes) 70~80% → Off (takes 30 minutes)

In the wake-up mode, as shown in FIG. 7A, light of 5000K starting with the peak intensity of the second wavelength region being 0.6 to 1.2 compared to the peak intensity of the first wavelength region is emitted, and after a set time, the peak intensity of the second wavelength region is reduced to the first wavelength region. Since the light of 6500K, which is 1.2 to 2.0 compared to the peak intensity of , is emitted, the awakening effect of suppressing melatonin is maximized.

In addition, in the sleep induction mode, as shown in FIG. 8, the peak intensity of the second wavelength region is 0.3 or less compared to the peak intensity of the first wavelength region and 4000K light is emitted, and the melatonin activity effect is maximized by turning off after a set time.

As described above, preferred embodiments of the present invention have been disclosed in the present specification and drawings, and although specific terms have been used, they are only used in a general sense to easily explain the technical content of the present invention and help understanding of the present invention. However, it is not intended to limit the scope of the present invention. It is obvious to those skilled in the art that other modified examples based on the technical spirit of the present invention can be implemented in addition to the embodiments disclosed herein.

1000: lighting device
100: light source
110: first LED package
120: second LED package
111, 121: substrate
112: 122: reflector
113: bare chip 1
113a: bare chip 1a, 113b: bare chip 1b
123: bare chip 2
114, 124: phosphor
200: control unit
300: storage unit
400: input unit
500: Ministry of Communication

Claims (14)

a first LED package having emission peaks in a first wavelength region and a second wavelength region;
a second LED package having an emission peak in a first wavelength region; and
a control unit that varies relative intensity of the emission peak existing in the second wavelength region based on the intensity of the emission peak existing in the first wavelength region in the optical spectrum;
A lighting device comprising a.
According to claim 1,
The lighting device according to claim 1 , wherein the first wavelength region is formed in the range of 400 to 470 nm, and the second wavelength region is formed in the range of 470 nm to 490 nm.
According to claim 1,
The lighting device, characterized in that the relative intensity of the peak present in the second wavelength region in the second LED package on the light spectrum is formed smaller than the relative intensity of the emission peak present in the first wavelength region.
According to claim 1,
The lighting device, characterized in that the second LED package has a color temperature of 1800 to 6500K.
According to claim 1,
The lighting device, characterized in that the relative intensity of the emission peak existing in the second wavelength region based on the emission peak intensity of the first wavelength region present in the first LED package is 1.2 to 2.0.
According to claim 1,
The lighting device, characterized in that the first LED package has a color temperature of 4000 to 6500K.
According to claim 3,
The lighting device according to claim 1 , wherein the control unit can vary the color temperature of the entire indoor lighting device by varying relative intensity of the emission peak in the second wavelength region based on the emission peak intensity in the first wavelength region.
According to claim 1,
Wherein the first LED package has a peak wavelength in each of the first wavelength region and the second wavelength region, and the second LED package has a peak wavelength present only in the first wavelength region.
According to claim 1,
The indoor lighting device further comprises an input unit for inputting a natural light mode or a special mode, and the control unit varies relative intensities of the luminescence peak of the first wavelength and the luminescence peak of the second wavelength according to the input value. Device.
According to claim 9,
When the natural light mode is input, the control unit divides the time from sunrise to sunset into a set number of sections, and sets a color temperature variation in each section differently.
According to claim 10,
The set number of sections is formed of three sections, the amount of change in color temperature in the first section of the three sections is greater than the amount of change in color temperature in the second section, and the amount of change in color temperature in the third section is greater than the amount of change in color temperature in the first section. A lighting device characterized in that formed larger than the color temperature change of the.
According to claim 7,
The indoor lighting device further comprises a communication unit or storage unit, and the communication unit or storage unit receives or stores sunrise and sunset times.
According to claim 1,
Wherein the first LED package and the second LED package are formed in plurality, and the control unit determines the driving number or applied current of the first LED package and the second LED package.
a first LED package having a wavelength peak of a first wavelength and a wavelength peak of a second wavelength;
a second LED package having a wavelength peak of a first wavelength and not having a wavelength peak of a second wavelength; and
a control unit which adjusts overall color temperature by varying the emission peak intensity of the second wavelength based on the emission peak intensity of the first wavelength in the light spectrum;
A lighting device comprising a.

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