CN102352970B - Novel LED (light emitting diode) light source and illumination device thereof - Google Patents
Novel LED (light emitting diode) light source and illumination device thereof Download PDFInfo
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Abstract
The invention discloses a novel LED (light emitting diode) light source and an illumination device thereof, belonging to a light emitting system and device. Because the existing white light LED spectrum is in a narrower belt shape, is incomplete in color, higher in color temperature and lower in color rendering and has non-soft and discordant lights to eyes, in the invention, through reducing the blue light peak value in the white light LED light source, and supplying green and red light components in the white light LED spectrum, the spectrum is continuous and widened, thus the aim of the modification of the origional light source is achieved.
Description
Technical field
The invention belongs to illuminating engineering field, be specifically related to a kind of luminescent system and device, particularly a kind of LED light source and lighting device thereof.
Background technology
Current lighting source mainly contains incandescent lamp, Halogen lamp LED, fluorescent lamp and LED etc., although they bring the facility of illumination to the mankind, but they cut both ways.
Incandescent lamp refers to and utilizes heat radiation to make it produce the light source of visible ray by heating some metallics, the spatial distribution of incandescent light is continuous, be continuous spectrum in the part of visible ray, but simultaneously, as a kind of light source being produced heat radiation and luminescence by heating, the Energy distribution of incandescent light mainly concentrates on the longer region of wavelength, therefore has stronger short infrared in its light composition.The ability that short infrared penetrates ocular tissue is comparatively strong, can be caused denaturation of lens proteins after being irradiated to ocular tissue by crystalline lens absorption.Originally there is cavity and point turbidity in cortical layer after crystallin; Sometimes on anterior lens capsule top layer, visible top layer is peeled off, and one end is attached on cyst membrane, and one end is curling to be free in anterior chamber.After it is through refractive media, macula retinae place can be focused on, cause pars iotica retinae to burn.Visible, although the responding ability at human eye each wavelength place in visual field can be used fully under incandescent lamp light-illuminating, eyes indefatigability, in use incandescent lamp light spectrum infrared part is also inevitable to the harm of human body eyesight.On the other hand, from energy consumption angle, in use, only the electricity of 30% is used for luminous incandescent lamp, and other energy is all for heating, and luminous efficiency is too low compared with current various new-type light source.
High-pressure sodium lamp, be electric current by high-pressure mercury vapor, make it ionization and excite, form the light source of electronics in discharge tube, atom and interionic collision and luminescence.Main radiation be the visible line of 404.7nm, 435.8nm, 546.1nm and 577.0 ~ 579.0nm, the long wave ultraviolet of the 365.0nm that radiation is stronger in addition.The penetrability of long wave ultraviolet to clothing and human body skin is eager to excel more than ultraviolet B radiation; deep dermis can be reached; and can the melanin of his-and-hers watches skin zone position work, thus cause dermal melanin calm, make skin darkening; serve defence ultraviolet; the effect of protection skin, though skin acute inflammation can not be caused, slow to the effect of skin; can long term accumulation, be the reason causing skin aging and grievous injury.In addition, not containing ruddiness in the light of high-pressure sodium lamp, easily cause human eye to experience red ability decline under being chronically exposed to this light and even form colour blindness.
Fluorescent lamp, is fluorescent lamp again, is that the ultraviolet utilizing low-pressure mercury vapour to discharge to produce excites and is coated in the fluorescent material of tube inner wall and the electric light source of luminescence.Different fluorescent material can send the light of different colours.The electric energy of about 60% can be exchanged into ultraviolet light, and all the other are converted to heat energy.The ultraviolet luminous energy of about 40% is converted to visible ray.The main wavelength of its visible ray is 405nm (royal purple light), and 436nm (blue light), 456nm (green glow) and 577nm (gold-tinted) are discrete spectrum.And compared with ordinary incandescent lamp, the wavelength sent is too short, easily causes visual fatigue, the rod cell of eye being sustained damage, is also cause the bathomorphic reason of young man.In addition, fluorescent lamp can produce ultraviolet radiation, if fluorescent tube fragmentation also may cause the mercury pollution of environment.
LED (Light Emitting Diode) be light emitting diode again, is a kind of solid-state semiconductor devices, directly electricity can be converted into light.LED luminescence is based on electronics and hole-recombination in function of current lower semiconductor material, and the excess energy that at this moment electron institute is carried needs to discharge.If this excess energy discharges with electronics and lattice dependent interaction namely to produce phonon, heat will be produced; If this excess energy is with form of photons release, just create light.Photon energy is the energy difference between two positions, determines optical wavelength.
Current white light LEDs mainly utilizes " Blue-Ray technology " to coordinate with fluorescent material and forms white light.Implementation method has two kinds, and first method is that coating can by blue-light excited yellow fluorescent powder on blue LED die, and the blue light that chip sends and the gold-tinted that fluorescent material sends complementation form white light.And the emission spectrum that the shortcoming of this scheme principle is exactly Ce3+ ion in this fluorophor does not have a continuous spectrum characteristic, colour rendering is poor, and be difficult to the requirement meeting the illumination of low look, luminous efficiency is also not high simultaneously.The peak efficiency of this LED reaches 44.3lm/w, and most high light flux is 187lm, and industrialization product can reach 120lm, and Ra is 75-80; Second method is coating green and red fluorescence powder on blue LED die, the green glow that the blue light sent by chip and fluorescent material are sent and ruddiness compound obtain white light, colour rendering is better, but the effective conversion efficiency of this method fluorescent material used is lower, and especially the efficiency of red fluorescence powder is lower.This LED colour temperature can reach the better result of 3000K-6000K, and Ra reaches 82-87, and comparatively before-mentioned products increases.Meanwhile, this defect that two kinds of methods all exist uniformity difference, colour temperature changes with angle.Fluorescent material excite peak width and short, and blue-light excited peak height and narrow, wavelength is short, and energy is high, directly can penetrate crystal to go directly on eye ground, active cell oxidation reaction, active cell apoptosis, causes retina cell to damage, and causes visual impairment even to be lost.
The light of sunshine medium ultraviolet and infrared wavelength can damage people too.The reaction that infrared radiation produces is caused by molecular vibration and temperature raise.The heat radiation that infrared ray causes is strong to the penetration power of skin, can arrive hypodermis.Infrared ray makes skin temperature raise by its thermoradiation efficiency, telangiectasis, congested, increases the harmful effect that transepidermal water evaporation etc. directly causes skin.Its main manifestations is red papules, skin crosses presenility and pigment disorderly.Ultraviolet mainly causes photochemical reaction and photoimmunology reaction, can cause allergic dermatitis even cutaneum carcinoma.Under natural sunlight.Skin then can be subject to ultraviolet and ultrared double action, and infrared ray can also promote the development of UV-induced cutaneum carcinoma.
Chinese patent application CN101806430A discloses a kind of White LED with high color rendering property, comprise the blue-light LED chip that excitation wavelength range is 445-465nm and the phosphor powder layer be coated on blue-light LED chip, in this technical scheme, described fluorescent material is included in the green emitting phosphor that blue-light LED chip excites lower generation green glow, and its emission wavelength is 495-535nm; Excite the yellow fluorescent powder of lower generation gold-tinted at blue-light LED chip, its emission wavelength is 540-570nm; Excite the red fluorescence powder of lower generation ruddiness at blue-light LED chip, its emission wavelength is 630-650nm.But there is following technical problem in White LED with high color rendering property disclosed in the document: the white light of (1) White LED with high color rendering property is formed primarily of blue-ray LED excitated fluorescent powder, therefore it is very high at 435-480nm wave band energy, blue light representated by this part has stronger spread effect to human eye retina, easily damages human eye retina.(2) sunshine spectrum is best suited for the spectrum of Human Physiology, and it is not only continuous spectrum, and each wave band energy in visible-range is comparatively even.And the energy of the blue wave band of White LED with high color rendering property is high more than the light energy of other wave band, and do not meet the vision physiological rule of human body.
Up to the present, a kind of lighting source harmless to the mankind is not had yet.Although these light loss evil effects to the mankind are slowly, and we live in these light every day, and the infringement that they cause just can not be ignored.Therefore, we urgently work out a kind of low power consuming, high energy efficiency, and to human health and the more useful lighting source of environment.
Summary of the invention
In view of common white light LED light spectrum is in narrower band shape, color is incomplete, and colour temperature is higher, and colour rendering is on the low side, and light is neither soft also inharmonious to eyes; And a kind of White LED with high color rendering property blue light composition is too high disclosed in Chinese patent application CN101806430A, each wave band energy of spectrum is uneven, the present invention is by reducing the blue peak in white LED light source, supplement green glow and red color light component in white light LEDs spectrum, make spectrum continuous and wide length, thus reach the object of improved white light LED light source.
The present invention's first object is: provide a kind of can in the full spectrum of 380-780nm, correlated colour temperature from the successional lighting source of spectral preservation in the scope of about 2700-13000K, and the relative spectral height of its each wavelength again can be close as much as possible with sunshine spectrum.
As a kind of form of LED light source of the present invention, it is integrated type LED light source.It is by by carrying out following improvement to common white light LEDs.
First, highly reflecting films are attached on the medial surface of lampshade by the present invention, thus blue light (435-480nm) composition in white light LEDs spectrum is weakened 40%-60%.
The slide material that the present invention and highly reflecting films are affixed is silica, and the highly reflecting films radius used is 10-40mm, and thickness is 0.5-1.1mm, is the mixture of titanium oxide and silica bi-material.
Highly reflecting films are the film of high index of refraction, are affixed on the slide of low-refraction, and two reverberation of film upper and lower surface make interference strengthen, thus reverberation is strengthened, and transmitted light weakens.General individual layer highly reflecting films can make reflectivity bring up to more than 30%, and multilayer highly reflecting films can improve more.Highly reflecting films are affixed on lampshade by the present invention, reduce the transmissivity of blue light, thus play the object weakening blue light (435-480nm) composition.These highly reflecting films are that 460nm place has maximum reflectivity to be 40%-60% at wavelength, and reflectivity is that axle is decayed to both sides centered by 460nm by wavelength, decays to 20% respectively, decay to 5% at 380nm and 560nm place at 420nm and 520nm place.The transmitance of the highly reflecting films that the present invention uses and the relation curve of wavelength of light are as shown in Figure 1.
Secondly, for the trough (generally between 480-520nm) after the blue crest of white light LEDs, the present invention by increasing green light LED monomer, the green glow of green light LED Monomer emission 480-520nm on white light LEDs luminous plaque, and supplementary wavelength is the LED light spectrum of 480-520nm.
Finally, for the red color light component of white light LEDs spectrum latter end decay, the design by increasing red-light LED monomer, the ruddiness of red-light LED Monomer emission 670-720nm on white light LEDs luminous plaque, and supplementary wavelength is the red LED composition of 670-720nm.
The present invention is by measuring LED light of the present invention spectrum and the white light LEDs curve of spectrum before improving, give novel white-light LED of the present invention and contrast figure (as shown in Figure 5) with the curve of spectrum of common white light LEDs, as can be seen here, after novel white-light LED after improvement supplements the composition of green glow and ruddiness, spectral energy is even, similar to sunshine spectrum, meet the vision physiological rule of human body.Especially, on 435-480nm wave band, the white light LEDs before the energy Ratios improvement of novel white-light LED reduces 40-60%, largely reducing the blue light easily human body retina being caused to damage, adds the security of light source.
In addition, the present invention also measured weres White LED with high color rendering property spectral comparison figure disclosed in LED light of the present invention, common white light LED light spectral curve and Chinese patent application CN101806430A thereof under same measured condition, as shown in Figure 6, Figure 7.As can be seen here, (1) spectrogram of common white light LEDs and White LED with high color rendering property is all higher at 435 ~ 480nm wave band energy, blue light representated by this part easily damages retina, and LED is moderate in the light energy of this wave band, can not cause damage to human body.(2) light energy of each wave band of White LED with high color rendering property and common white light LEDs is uneven, and blue wave band energy is higher, and the energy of red spectral band is lower, and tone is colder, does not match with the sunshine spectrum of optimum; And the light energy of each wave band of white light LEDs of the present invention is comparatively even, and red spectral band energy is higher, and tone is partially warm, meets the psychological need of human body.
Excessively strong for LED luminescence chip surface light density, easily cause burning to people's macula lutea, the present invention selects low-yield LED module, and (LED module is encapsulated LED by necessarily regularly arranged exactly together again, adds the product that some water-proofing treatment form.) as lighting source, total luminous power of LED is 6.0w.Wherein red LED monomer accounts for the 5%-15% of total light source, and green LED monomer accounts for the 10%-20% of total light source.This light source color temperature is 2700-13000K, and be preferably 2800-3500K, colour rendering index is 85-97.This light source in the luminous intensity of room lighting preferably between 200-300Lux.
The present invention to set a song to music line chart by measuring the red-light LED monomer of different proportion, the novel white-light LED light of the present invention of green LED combination of monomers, the basis of original white light LEDs monomer increases red-light LED monomer and the green light LED monomer of varying number proportioning, obtain the lighting source of better continuous spectrum, and the relative spectral height of its each wavelength again can be close as much as possible with sunshine spectrum.The red-light LED monomer of the different proportion that the present invention is applicable to, green LED combination of monomers are: the red-light LED monomer of (1) 15%, the green light LED monomer of 10%; Or (2) increase the red-light LED monomer of 5%, the green light LED monomer of 10%; Or (3) increase the red-light LED monomer of 15%, the green light LED monomer of 20%.
Second object of the present invention is, provides a kind of lighting device realizing the LED light source of the present invention's first object.This device shape is cast, panel-shaped and pyriform, and the present invention is not limited to the shape of these devices.
When the lighting device shape of LED light source is cast, light emitting module is made up of White LED, green LED monomer and red LED monomer, and White LED, green LED monomer and red LED monomer are screwed on rectangle base plate.Highly reflecting films are glued on glass (or plastics) lampshade, and glass or plastic lamp shade are connected with the plastic feet of both sides.Power line is by base connection transformer.
When the lighting device shape of LED light source is panel-shaped, light emitting module is made up of White LED, green LED monomer and red LED monomer, and White LED, green LED monomer and red LED monomer are screwed on foursquare base plate.Highly reflecting films are glued on foursquare glass or plastic lamp shade, and glass or plastic lamp shade are embedded in the groove of round metal frame, and round metal frame is screwed on the aluminium shell of light fixture by internal and external threads.Power line is connected with the transformer of base plate dorsal surface by the aperture on aluminium shell wall.
When the lighting device shape of LED light source is pyriform (as shown in Figure 2), light emitting module is made up of White LED, green LED monomer and red LED monomer, White LED, green LED monomer and red LED monomer are screwed on retainer ring, and the light that White LED, green LED monomer and red LED monomer send is concentrated by metal light-gathering shell.Highly reflecting films are glued on glass or plastic lamp shade, and glass or plastic lamp shade are embedded in becket groove, and becket is screwed on metal light-gathering shell by internal and external threads.Radiating module is made up of metal shell and radiating fin, and radiating fin is fixed on metal shell.Within plastic casing, external thread form screws on radiating fin.Power line is connected with transformer with the aperture on metal shell wall by plastic casing.
We adopt blue-light LED chip and fluorescent material to organically combine and are aided with method that is green and red LED monomer, to become radius to be the hemispherical white light LEDs of 3cm by the packaging technology of routine with epoxy encapsulation.Blue-light LED chip is arranged in bowl-type reflection cavity, covers the thin resin layer being mixed with YAG, and the mass content of YAG is 30-50%.The blue light components that LED chip sends is absorbed by fluorescent material, the yellow light mix that another part blue light and fluorescent material send, and can obtain white light, supplements spectrum in addition with red and green LED monomer.Luminous component is encapsulated in resin.
Another form of LED light source of the present invention is single great power LED.Single great power LED is made up of lampshade, highly reflecting films, integrated single high-power LED chip, constant-current driving power supply, heat sink, high power LED substrate.Integrated single high-power LED chip is the single led chip of the integrated chip of, Bai Sanse red, green by many.Highly reflecting films are affixed on lampshade medial surface, and the blue light of chip (435-480nm) composition can be weakened 40%-60% by highly reflecting films; Lampshade is arranged on high power LED substrate edge, and high power LED substrate one side is connected with integrated single high-power LED chip, and another side is connected with heat sink.Integrated single high-power LED chip and constant-current driving power supply are positioned at lampshade, and integrated single high-power LED chip is connected with constant-current driving power supply.Single great power LED by reducing the blue peak in white LED light source, can supplement green glow and red color light component in white light LEDs spectrum, making spectrum continuous and wide length, thus reach the object improveing original light source equally.
In a word, the present invention compared with prior art, has following technical advantage:
First, in common white light LEDs, the infringement of high energy blue light to human eye is larger, the non-vision photosensitive system of human body is the most responsive to blue light in addition, the environment be in for a long time by high energy blue light illumination can upset the circadian rhythm of human body, this is unfavorable for promoting the use of of LED illumination, and the present invention is by adopting reflectance coating to the quantitative decay technique of 435-480nm spectrum, the blue peak of novel white-light LED is the 50%-60% of common white light LEDs, greatly reduce the damage of blue light to human eye, and novel white-light LED of the present invention is while reduction blue peak, effective launching efficiency of fluorescent material does not reduce, improve colour rendering and light efficiency.
The second, the infrared and ultraviolet spectra in sunshine spectrum all can cause certain injury to human skin, in the spectrum of novel white-light LED of the present invention, do not have ultraviolet and infrared spectrum, thus the light of people when throwing light on from these two kinds of spectrum is injured.
3rd, novel white-light LED of the present invention had both inherited that common white LED light source efficiency is high, the life-span is long, volume is little, reliability is high, can not cause the advantages such as mercury pollution, also correct its some drawbacks simultaneously; Novel white-light LED of the present invention, close with the sunshine spectrum of optimum in the spectral region of visible ray, be continuous spectrum, colour rendering index is high, and color is comprehensive, can reduce the color of object well.
Accompanying drawing explanation
Fig. 1 is the transmitance of the highly reflecting films that the present invention uses and the graph of relation of wavelength of light.
Fig. 2 is a kind of novel white-light LED light device structural representation figure of one embodiment of the invention.201 is power line; 202 is plastic casing; 203 is radiating fin; 204 is metal shell; 205 is metal light-gathering shell; 206 is becket groove; 207 is becket; 208 is becket; 209 is metal light-gathering shell; 210 is retainer ring; 211 is screw; 212 is LED chip.
Fig. 3 is the LED chip plane of a kind of novel white-light LED light device of one embodiment of the invention.301 is green light LED; 302 is white light LEDs; 303 is red-light LED; 304 is LED circuit board.
Fig. 4 is the sectional structure schematic diagram of a kind of novel white-light LED light device of one embodiment of the invention.401 is power line; 402 is plastic casing; 403 is radiating fin; 404 is transformer; 405 is LED chip; 406 is metal light-gathering shell; 407 is highly reflecting films; 408 is drive circuit; 409 is retainer ring; 410 is glass (or plastics) lampshade.
Fig. 5 is that novel white-light LED of the present invention contrasts figure with the curve of spectrum of common white light LEDs.
Fig. 6 is the novel white-light LED of colour temperature when 3996K, the spectral curve of high colour developing white light LEDs (disclosed in CN101806430A White LED with high color rendering property) and common white light LEDs.
Fig. 7 is the novel white-light LED of colour temperature when 4986K, the spectral curve of high colour developing white light LEDs (disclosed in CN101806430A White LED with high color rendering property) and common white light LEDs.
Fig. 8 is under 6450 colour temperatures, the spectral curve of contained red, novel white-light LED that green light LED ratio is different.
Detailed description of the invention
Further describe the present invention below by way of specific embodiment, but the present invention is not limited only to following examples.Those skilled in the art can use for reference present disclosure, and suitably improving or adjust step method of the present invention can realize.Special needs to be pointed out is, all similar replacements and change, to those skilled in the art, be apparent, they are all deemed to be included in the scope of the invention.
Embodiment 1
Fig. 2 is a kind of novel white-light LED light device structural representation figure of one embodiment of the invention.Fig. 3 is the LED chip plane of a kind of novel white-light LED light device of one embodiment of the invention.Fig. 4 is the sectional structure schematic diagram of a kind of novel white-light LED light device of one embodiment of the invention.
A kind of novel white-light LED light device shape of the present embodiment is pyriform (as shown in Figure 2).Light emitting module is made up of (as shown in Figure 3) the LED chip 212 of white light, green glow and ruddiness, and chip 212 is fixed on retainer ring 210 by screw 211, and the light that chip 212 sends is concentrated by metal light-gathering shell 205.Highly reflecting films are glued on glass (or plastics) lampshade, and glass or plastic lamp shade are embedded in becket groove 206, and becket 208 is screwed on metal light-gathering shell 209 by internal and external threads.Radiating module is made up of metal shell 204 and radiating fin 203, and radiating fin 203 is fixed on metal shell 204.Within plastic casing 202, external thread form screws on radiating fin 203.Power line 201 is connected with transformer with the aperture on metal shell 204 wall by plastic casing.
Fig. 3 gives the LED chip plane of a kind of novel white-light LED light device of one embodiment of the present of invention.The rectangle blockage of white represents white light LEDs monomer, totally 28; The rectangle blockage of black represents green light LED monomer, totally 4; Center has the rectangle blockage of intersection to represent red-light LED monomer, totally 5.The voltage of each LED monomer is 3V, and electric current is 20 milliamperes, and luminous power is 0.06w.The arrangement of monomer presents radial, is conducive to the balance of luminous intensity, improves light diffusing, luminous evenly free from glare.Meanwhile, because LED adopts red and green LED monomer to supplement spectrum, and absorb the blue light of about 40%-60% with high-reflecting film, make the visible light wave range of spectrum close to sunshine of LED light source, be expected to become the new type light source being beneficial to health most.
Claims (5)
1. a LED light source, it is characterized in that: described LED light source comprises light source, lampshade and highly reflecting films, described light source is made up of White LED, green LED monomer and red LED monomer, red LED monomer accounts for the 5%-15% of total light source, green LED monomer accounts for the 10%-20% of total light source, the green glow of green LED Monomer emission 480-520nm, the ruddiness of red LED Monomer emission 670-720nm, highly reflecting films are attached on the medial surface of lampshade; White LED has White LED spectrum, and described White LED spectrum has blue crest, and the blue light 435-480nm composition in White LED spectrum is weakened 40%-60% by described highly reflecting films; Described White LED spectrum has trough after blue crest, and green LED monomer supplements the LED light spectrum that wavelength is 480-520nm; Described White LED spectrum latter end has the red color light component of decay, and red LED monomer supplements the LED light spectrum that wavelength is 670-720nm.
2. comprise a device for LED light source as claimed in claim 1, described lampshade is glass or plastic lamp shade, it is characterized in that: described White LED, described green LED monomer and described red LED monomer are screwed on retainer ring; The light that described White LED, described green LED monomer and described red LED monomer send is concentrated by metal light-gathering shell; Described highly reflecting films are glued on described glass or plastic lamp shade, and described glass or plastic lamp shade are embedded in becket groove, and becket screws on metal light-gathering shell by internal and external threads; Radiating module is made up of metal shell and radiating fin, and radiating fin is fixed on metal shell; Within plastic casing, external thread form screws on radiating fin; Power line is connected with transformer with the aperture on metal shell wall by plastic casing.
3. comprise a device for LED light source as claimed in claim 1, it is characterized in that: also comprise constant-current driving power supply, heat sink and high power LED substrate; Described White LED comprises white LED chip, described green LED monomer comprises green LED chip, described red LED monomer comprises red LED chips, and integrated single high-power LED chip is by the integrated single led chip of many red LED chips, green LED chip and white LED chip; Lampshade is arranged on high power LED substrate edge, and high power LED substrate one side is connected with integrated single high-power LED chip, and another side is connected with heat sink; Integrated single high-power LED chip and constant-current driving power supply are positioned at lampshade, and integrated single high-power LED chip is connected with constant-current driving power supply.
4. device according to claim 2, is characterized in that, described device shape is pyriform, panel-shaped or tubular.
5. device as claimed in claim 2 or claim 3, it is characterized in that, described highly reflecting films radius is 10-40mm, and thickness is 0.5-1.3mm, and material is the mixture of silica and titanium oxide, and described lampshade material is silica.
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| CN201110226723.XA CN102352970B (en) | 2011-08-09 | 2011-08-09 | Novel LED (light emitting diode) light source and illumination device thereof |
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| CN201110226723.XA CN102352970B (en) | 2011-08-09 | 2011-08-09 | Novel LED (light emitting diode) light source and illumination device thereof |
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