CN101672433A - Led lighting device - Google Patents
Led lighting device Download PDFInfo
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- CN101672433A CN101672433A CN200910002284A CN200910002284A CN101672433A CN 101672433 A CN101672433 A CN 101672433A CN 200910002284 A CN200910002284 A CN 200910002284A CN 200910002284 A CN200910002284 A CN 200910002284A CN 101672433 A CN101672433 A CN 101672433A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B20/00—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps
- Y02B20/72—Energy efficient lighting technologies, e.g. halogen lamps or gas discharge lamps in street lighting
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- Arrangement Of Elements, Cooling, Sealing, Or The Like Of Lighting Devices (AREA)
Abstract
The present invention relates to an LED lighting device. The invention provides a lighting device which uses LED as a light source. The LED lighting device can control the photometric characteristic of transmitted light according to the state of surrounding environment thereby improving the function of the lighting device and obtaining high energy saving effect. Each of three kinds of LED opticalmodules comprises an LED light source and a photometric control lens formed according to different shapes, and furthermore has photometric characteristics different from one another. Each of three kinds of LED optical units comprises a plurality of LED optical modules which are of same kind. The LED lighting device can comprise a group of LED optical units with photometric characteristics different from one another. The LED lighting device can comprise optical control units which are used for controlling a corresponding LED optical unit separately according to the state of surrounding environment thereby controlling the photometric characteristics overall.
Description
Technical field
The present invention relates to the LED lighting device, specifically, relate to a kind of outdoor use with the LED lighting device of LED as light source.
Background technology
On the routine, compare with the intensity of the lighting device of indoor use, the general lighting device of outdoor use need be launched higher intensity (emitting light flux of increase).Yet, realize may being accompanied by higher power consumption when intensity increases.In order to suppress power consumption and to reduce operating cost, when attempting obtaining high energy-saving effect, multiple lighting device has been proposed.
The example of this lighting device comprise have can come high-pressure discharge lamp that luminous intensity is controlled according to exterior light control signal or manually-operated lighting device (for example, referring to Japanese Patent Application Laid-Open No.JP2007-149520A1), thereby be used to control the lighting device (for example, referring to Japanese Patent Application Laid-Open No.JP2003-168575A1) that regularly increases or reduce the timer of its luminous intensity etc. such as the various switches that are switched on or switched off with having.
Summary of the invention
In general, the lighting device that be arranged in the means of transportation comprises road lighting, pedestrian's illumination, parking lot illumination.These lighting devices have the respective specific light distribution characteristic in the place of depending on that they are set.And, even the lighting device of same type is arranged on same place, the ambient conditions of these lighting devices also differ from one another (for example, surrounding environment depend on building etc., rainfall, fog density and other environmental factor).Therefore, its light distribution characteristic will differ from one another accordingly with specific relative set place.If satisfy these characteristics, then the function of these lighting devices can be improved.
In contrast, disclosed lighting device can be controlled such as the various switches that are switched on or switched off regularly among Japanese Patent Application Laid-Open No.JP2007-149520A1 and the JP2003-168575A1, thereby increase or reduce its intensity, but controlled light distribution characteristic is not provided.
Below at road lighting, why illustrating should be according to such as ambient conditions (for example, the brightness, rainfall, the fog density that depend on building etc. of surrounding environment, and other environmental factor) Several Parameters control the light distribution characteristic of illumination light and the feasibility of distribution controls.
That is to say that when advancing night, the light that sends from the lighting device along the curb setting can be entered driver's eyes by road reflection, thereby the driver can visually confirm the pavement behavior in traveling vehicle the place ahead.
This is because the light that sends from lighting device can stand the diffuse reflection (Here it is so-called " Lambertian reflection ") on trickle concavo-convex uneven road surface, make the light that is reflected with diffusion to carry out scattering around its neighborhood, scattered light can enter driver's eyes, thus, he can see that the brightness on road surface increases.
When vehicle was advanced in rainy night, the driver may experience the road surface of serving as minute surface because of the rainwater of the savings on the road surface.The light of sending from lighting device can be reflected in this minute surface road surface.Therefore, the light that is directed downwards along more close traveling vehicle that send from lighting device (as shown in figure 19, being positioned at traveling vehicle the place ahead), lucky is reflected towards this vehicle by the specular surface of the road that forms because of rainwater, thereby enters driver's eyes.Thus, the driver can discern bright road surface.
Edge that send from lighting device on the other hand,, lucky can be by the opposite side of the specular surface of road reflection to this vehicle away from the downward light of the other direction (side relative with vehicle, or the direct of travel of vehicle) of traveling vehicle.Thus, these light can not enter driver's eyes.That is the light that, sends from lighting device, be directed downwards along the opposing party relative with vehicle just can not contribute to the visibility of driver's road pavement.
Designed the present invention in view of these and other problem and in conjunction with routine techniques.It is a kind of with the lighting device (or LED lighting device) of LED as light source that one aspect of the present invention can provide.LED lighting device of the present invention can be controlled radiative light distribution characteristic according to ambient conditions, thereby can improve the function of lighting device, and can obtain high energy-saving effect.
In order to address these problems, the claimed the present invention of claim 1 is a kind of LED lighting device, and this LED lighting device comprises:
One group of LED optical unit with different light distribution characteristics, each LED optical unit all comprises at least one the LED optical module that is used to form corresponding light distribution characteristic, described LED optical module comprises LED that is used as light source and the distribution controls lens of arranging along the illumination direction of this led light source, the LED optical module that is installed on the same LED optical unit is same type, and the LED optical module that is installed on the different LED optical unit differs from one another, wherein
Described LED lighting device also comprises light control unit, and this light control unit comprises:
The environmental aspect detecting unit is used to detect the surrounding environment of described LED lighting device;
LED optical unit driving/control module is used to control the optics output of each described LED optical unit; And
The optics output control unit is used for sending optics output control signal to described LED optical unit driving/control module, and this optics is exported control signal with corresponding from the detection signal of described environmental aspect detecting unit, and
Wherein, based on detection signal from described environmental aspect detecting unit, control respectively by being subjected to the optics of each described LED optical unit to be exported, thereby can control the light distribution characteristic of described LED lighting device from the described LED optical unit drivings/control module that described optics output control unit is sent the optics output control signal control that comes.
The present invention of claim 2 is the LED lighting device of claim 1, wherein, described distribution controls lens comprise the light from described LED incide on it incidence surface and to the radiative light emission surface in outside, described incidence surface and described light emission surface all along illumination direction with respect to described LED bending, to form roughly convex profile;
The focus of described distribution controls lens is positioned near part that described LED places or its; And
Described light emission surface comprises variform a plurality of continuous free bends surface.
The present invention of claim 3 is the LED lighting device of claim 2, wherein, the described light emission surface of described distribution controls lens has the shape that along assigned direction light is reflected in a continuous manner according to the incidence angle from the light of the focus of described distribution controls lens.
The present invention of claim 4 is each a LED lighting device in the claim 1 to 3, and wherein, described LED optical unit driving/control module comprises constant current circuit.
The present invention of claim 5 is each a LED lighting device in the claim 1 to 4, and wherein, described environmental aspect detecting unit comprises brightness detector at least and/or is used to detect the rainfall detector of rainfall.
The present invention can provide a kind of have an assembly light characteristic different (for example, three types) the LED lighting device of LED optical unit, each LED optical unit all comprises at least one the LED optical module that is used to form specific light distribution characteristic, and this LED optical module comprises led light source and is used to form the distribution controls lens of the given shape of this light distribution characteristic.In this structure, this LED lighting device also comprises light control unit, and the feasible optics output that can control each LED optical unit according to environmental aspect discretely thus, can be controlled the light distribution characteristic of this LED lighting device.
As a result, this lighting device can have the specific light distribution characteristic in the particular fragments zone that for example meets the broader region that will throw light on.This can strengthen its function.And this LED lighting device can provide outstanding energy-saving effect.
Description of drawings
According to description with reference to the accompanying drawings, these and other characteristic of the present invention, feature and advantage will become clear, wherein:
Fig. 1 is the exploded perspective view of exemplary LED optical module of the present invention;
Fig. 2 is the stereogram of the LED optical module of Fig. 1;
Fig. 3 is the partial section of the LED optical module of Fig. 2;
Fig. 4 is the partial section of the LED optical module of Fig. 2;
Fig. 5 is the illustration sectional view of optical system that the LED optical module of Fig. 3 is shown;
Fig. 6 shows the ray trace figure of the different distribution controls lens of LED optical module;
Fig. 7 is the stereogram of narrow LED optical module;
Fig. 8 is the stereogram of middle LED optical module;
Fig. 9 is the stereogram of wide LED optical module;
Figure 10 is the figure of light distribution characteristic that the narrow LED optical module of Fig. 7 is shown;
Figure 11 is the figure of light distribution characteristic that the middle LED optical module of Fig. 8 is shown;
Figure 12 is the figure of light distribution characteristic that the wide LED optical module of Fig. 9 is shown;
Figure 13 is the exploded perspective view of exemplary LED optical unit of the present invention;
Figure 14 is the stereogram of the LED optical unit of Figure 13;
Figure 15 is the schematic elevational view of exemplary LED lighting device of the present invention;
Figure 16 is the schematic diagram that illustrates by the zone of each LED optical unit illumination of the LED lighting device of Figure 15;
Figure 17 has been the illustration block diagram of light control circuit of the present invention;
Figure 18 shows the figure of the directional characteristic of LED lighting device of the present invention;
Figure 19 shows the figure of the light distribution characteristic of this LED lighting device on the road surface;
Figure 20 shows the figure of the directional characteristic of this LED lighting device; And
Figure 21 shows the figure of the light distribution characteristic of this LED lighting device on the road surface.
Label declaration
1 LED optical module
The narrow LED optical module of 1a
LED optical module in the middle of the 1b
The wide LED optical module of 1c
2 conducting strips
3 heat-conducting plates
4 circuit substrates
5 distribution controls lens
6 protuberances (boss)
7 protruding latches
8 rigging screws
9 screws
10 screws
11 are used for the groove of filling adhesive
12 protuberance holes
13 protruding pin holes
14 LED
15 board connectors
16 flanges
17 screws
18 windows
19 adhesives
20 high heat conduction compounds
21 bumps
22 end surfaces
23 circuit board surfaces
24 light incident surfaces
25 light emission surfaces
26 LED optical units
The narrow LED optical unit of 26a
26b intermediate optical unit
The wide optical unit of 26c
27 tarpaulins
28 housings
29 hold-down screws
30 aerial lugs
31 wiring connector apparatus
32 extensions
33 outer lens
34 LED lighting devices
34a LED lighting device
34b LED lighting device
35 housings
40 light control units
41 constant current circuits
42 smooth o controllers
43 timers
44 brightness detectors
45 rainfall detectors
Zone, 46 road surface
The specific embodiment
Below with reference to Fig. 1 to 21, several preferred demonstration embodiments of the present invention are described in detail, wherein, same numeral refers to same or similar parts.Comprise the different technologies feature though only should be understood that the following demonstration embodiment that the mode by embodiment presents, unless regulation in addition, they are not construed as limiting the present invention.
Fig. 1 and 2 is respectively the exploded perspective view and the stereogram of the LED optical module of a demonstration embodiment according to the present invention.LED optical module 1 comprises make progress from the bottom stacked conducting strip 2, heat-conducting plate 3, circuit board 4 and distribution controls lens 5.
When being installed in LED optical module 1 on the housing, the conducting strip 2 that is arranged on the bottom can be arranged to, directly contact housing and be used for to the conduction of this housing preventing that by the heat that LED optical module 1 produces the temperature of LED optical module 1 from rising.The back will be described in more detail this.For this reason, conducting strip 2 by heat conduction with minimum thermal resistance but the material of electric insulation make.Conducting strip 2 is formed thinly as far as possible, only otherwise losing its physical stability gets final product.
Heat-conducting plate 3 is set on the top of conducting strip 2, and is made by the hard material of heat conduction (comprise the metal such as aluminium, copper and iron, and pottery).Be respectively arranged with one group of protuberance 6 and the protruding pin 7 that all projects upwards in the periphery of this heat-conducting plate 3 of the upper edge, a side of heat-conducting plate 3 and central authorities.Each protuberance 6 all comprises screw 9, perhaps comprises screw 10.Screw 9 is used to admit conducting strip plate 2, circuit board 4 and distribution controls lens 5 is kept together with the bar of the rigging screw 8 of assembling LED optical module 1.Screw 10 is used to admit and is used for fixing the bar of a plurality of LED optical modules 1 with the screw that forms a unit.Screw 9 and 10 all runs through heat-conducting plate 3 and forms.
Heat-conducting plate 3 also comprises the groove 11 of the closed loop that is positioned at protruding pin 7 inboards, plate centre.This groove 11 is used to hold adhesive.
Distribution controls lens 5 are set on the circuit board 4.Distribution controls lens 5 have flange 16 and are used to control from the distribution of the light of below LED 14 emissions.Flange 16 comprises the screw 17 of the bar that is used to admit the rigging screw 8 that is used to assemble the LED optical module.
Above-mentioned heat-conducting plate 3, circuit board 4 and distribution controls lens 5 are assembled in together by screw 8, to constitute LED optical module 1 as shown in Figure 2.
The adjacent domain of LED 14 can constitute shown in Fig. 3 or 4.In the demonstrative structure of Fig. 3, the circuit board 4 that the LED 14 that is used to cover window 18 is installed on it is placed on the flat surfaces of heat-conducting plate 3.Circuit board 4, so LED 14 by on the heat-conducting plate 3, pass the protruding pin 7 that runs through the protruding pin holes 13 that circuit board 4 forms and relatively locate with heat-conducting plate 3.
Utilization be carried in the groove 11 that is formed on the heat-conducting plate 3 adhesive 19 with the circuit board that LED 14 is installed on it 4 bonding/be fixed on the heat-conducting plate 3.
The window 18 of circuit board 4 is filled with high heat conduction compound 20, so that LED 14 is thermally coupled to heat-conducting plate 3.The heat energy that this structure makes LED 14 be generated dissipates to heat-conducting plate 3 enough effectively, prevents that thus the temperature of LED 14 from rising.
In the structure of Fig. 4, heat-conducting plate 3 comprises window 18 little and height with the thickness of the circuit board 4 roughly the same protrusion 21 of area than circuit board 4, so that be positioned at the end surfaces 22 of the protrusion 21 of the heat-conducting plate 3 in the window 18 of circuit board 4, with surface 23 approximate horizontal that are used to install LED14 of circuit board 4.In this structure, compare with the structure of Fig. 3, LED 14 direct thermal contact conductance plates 3, the heat energy that makes LED 14 generate enough more effectively dissipates to heat-conducting plate 3.As a result, more effectively prevented the temperature rising of LED optical module 1.
The height of the protrusion 21 of heat-conducting plate 3 can be less than the thickness of circuit board 4.In this case, formed space can be filled with high heat conduction compound 20 in the window 18 of circuit board 4, so that LED 14 is thermally coupled to heat-conducting plate 3.
Below, the optical system of this LED optical module is described.Fig. 5 forms the exemplary led light source of optical system of LED optical module and the schematic sectional view of distribution controls lens.
Distribution controls lens 5 are located round the optic axis X that extends forward from LED 14.The surface (light incident surface 24) of facing LED 14 of distribution controls lens 5 and apparent surface's (light emission surface 25) of distribution controls lens 5 have formed the roughly lens contour of convex to front curve (with respect to LED).In this arrangement, the focal point F of the light incident surface 24 of distribution controls lens 5 be positioned at LED 14 illuminating part near.
Enter distribution controls lens 5 and be led to light emission surface 25 from light incident surface 24 from LED 14 radial emission and the light that arrives the light incident surface 24 of distribution controls lens 5, leave distribution controls lens 5 from light emission surface 25 by distribution controls lens 5.
Because distribution controls lens 5 are used for the light distribution characteristic of LED 14 is converted to the light distribution characteristic of hope, so that its design is determined is as follows.
To be divided into a plurality of parts by the zone of specific LED optical module illumination, and determine the light distribution characteristic of hope at each part.Then, determine the shape of the light emission surface of distribution controls lens, so that incident light can be refracted and further be reflected when outgoing, thereby these lens have been launched the light with corresponding light distribution characteristic, as refract light.
The shape of the light emission surface of distribution controls lens is based on the shape (being that radius is the sphere of 50mm) of the light incident surface of these distribution controls lens in this exemplary embodiment, based on the distance between the light incident surface of led light source and distribution controls lens, and determine based on the refractive index of the material that forms the distribution controls lens.The angle of light at any specified point place of light incident surface can be determined according to the shape of light incident surface and the distance between led light source and the light incident surface.
By based on the design of describing among above-mentioned condition utilization such as the Japanese Patent Application Laid-Open No.JP2004-87179A1, can determine the shape of light emission surface.In the distribution controls lens of design like this, from the led light source radial emission and arrived the light incident surface of distribution controls lens and be refracted the light that then is guided by these distribution controls lens and be refracted at the eye point place, thereby refract light is directed to assigned direction.
According to the present invention, light emission surface has given shape, thereby makes emission light provide light distribution characteristic for each part of field of illumination, and this light distribution characteristic is continuous from a part to adjacent part.
In other words, the light emission surface of distribution controls lens has the incidence angle of basis from the light of the focus of distribution controls lens, makes the shape of light along the assigned direction refraction in a continuous manner.
Below, the optical characteristics of LED optical module is described.Consider following three kinds of LED optical modules: narrow LED optical module with narrow directionality; Wide LED optical module with wide directionality; And has a middle LED optical module that is in the third side tropism between narrow LED optical module and the wide LED optical module.
Below, consider to have the different distribution controls lens of each LED optical module of different directions, and each lens is carried out pencil tracing (referring to Fig. 6 A to 6C).It should be noted that each distribution controls lens all is designed to have spherical light emission surface, this sphere light emission surface protrudes forward with respect to LED, and has the radius of 50mm.
To shown in the 6C, the curvature of the light emission surface 25 of each distribution controls lens 5 all is associated with the divergence of the light of launching from light emission surface 25 as Fig. 6 A.Specifically, along with the curvature of light emission surface 25 lens from the lens of Fig. 6 A to Fig. 6 B, then the lens from the lens of Fig. 6 B to Fig. 6 C diminish gradually, and it is big that the degree that light beam is dispersed becomes.Thus, the distribution controls lens at narrow LED optical module preferably have the main light emission surface that combination constituted by deep camber sphere or aspheric surface or this surface.Distribution controls lens at wide LED optical module preferably have the main light emission surface that combination constituted by small curve sphere or aspheric surface or this surface.Distribution controls lens at middle LED optical module preferably have the main light emission surface that combination constituted by middle curvature sphere or aspheric surface or this surface.
Based on basic structure, three kinds of LED optical modules shown in Fig. 7,8 and 9, have been designed respectively according to the determined distribution controls lens of the result of ray trace.These three kinds of LED optical modules are only differ from one another aspect their the distribution controls lens (specifically, the shape of the light emission surface of distribution controls lens differs from one another).
LED optical module 1a shown in Figure 7 is narrow LED optical module.Its distribution controls lens 5 have the light emission surface 25 by a plurality of (being eight in this case) variform continuous free bend surface composition.This light emission surface 25 has the roughly point-symmetric shape of central shaft Z (or optical axis X of LED) with respect to the distribution controls lens.
LED optical module 1b shown in Figure 8 is middle LED optical module.Its distribution controls lens 5 have the light emission surface 25 by a plurality of (being four in this case) variform continuous free bend surface composition.This light emission surface 25 has the roughly point-symmetric shape of central shaft Z (or optical axis X of LED) with respect to the distribution controls lens.
LED optical module 1b shown in Figure 9 is wide LED optical module.Its distribution controls lens 5 have the light emission surface 25 by a plurality of (being four in this case) variform continuous free bend surface composition.This light emission surface 25 has the roughly point-symmetric shape of central shaft Z (or optical axis X of LED) with respect to the distribution controls lens.
At each distribution controls lens all is under the plane cutting of the central shaft Z that comprises the distribution controls lens and the situation of radially extending from this central shaft, near each cross section that all has the light emission surface 25 of maximum curvature central shaft Z is compared to each other, and the order of narrow LED optical module 1a of middle LED optical module 1b, Fig. 7 that the curvature of light emission surface is pressed wide LED optical module 1c, Fig. 8 of Fig. 9 increases.
The narrow LED optical module of Fig. 6 A has shown light distribution characteristic as shown in figure 10.The middle LED optical module of Fig. 6 B has shown light distribution characteristic as shown in figure 11.The wide LED optical module of Fig. 6 C has shown light distribution characteristic as shown in figure 12.From these light distribution characteristics as can be seen, the LED optical module of the narrower light distribution characteristic of generation has the bigger light emission surface of curvature.
In each distribution controls lens have in difform a plurality of free bends surface each all emission needle a part in a plurality of parts that limit in the zone of being thrown light at the LED optical module is provided the light of light distribution characteristic.Thus, it is identical to form the quantity of a plurality of parts that limit in quantity and the zone of being thrown light at the LED optical module on difform a plurality of continuous free bends surface of light emission surface on distribution controls surface of each LED optical module.
Though this LED optical module of three types can use separately, but also same type or dissimilar a plurality of modules can be made up, to construct the LED optical unit according to hope standard (for example, throwing light on, want field of illumination etc.) to the LED lighting device.
Figure 13 is the exploded perspective view that the wide LED optical unit 26c that comprises three wide LED optical module 1c is shown, and Figure 14 is its stereogram.LED optical unit 26c is installed in the bottom with three wide LED optical module 1c to have on the housing 28 of fin and tarpaulin 27 and constitute.All be placed with the heat-conducting plate (not shown) between each LED optical module 1c and the housing 28.Pass the screw 10 of wide LED optical module 1c and its screw-in is formed in the corresponding screw on the housing 28 by bar, and each wide LED optical module 1c is fixed on the housing 28 hold-down screw 29.
Similarly be to comprise the middle LED optical unit 26b of three middle LED optical module 1b and comprise that the narrow LED optical unit 26a of three narrow LED optical module 1a also designs as mentioned above.
Arranged as shown in figure 15 and amounted to nine LED optical units 26 (comprising two narrow LED optical units, six middle LED optical units and a wide LED optical unit), to constitute the LED lighting device 34 of this demonstration embodiment.As shown in figure 16, this arrangement is intended to utilize each the LED optical unit 26 that is provided with and has been assigned the road area that will throw light on by height 10m every 35m along curb two-lane highway that throws light on.
In this structure, LED lighting device 34 has the light control circuit 40 shown in the block diagram of Figure 17, thereby can control the light output of each LED optical unit 26 discretely.
In light control circuit 40, optics o controller 42 can generate optics output control signal when receiving the detection signal of self-timer 43, brightness detector 44 and rainfall detector 45, and this optics output control signal is delivered to corresponding constant current circuit 41.When receiving this control signal, constant current circuit 41 all generates a control electric current, thereby can control the optics output of each LED optical unit 26 discretely.
Figure 18 is an illustration according to the figure of the directional characteristic of the optics emulation of LED lighting device 34 as mentioned above.This figure has comprised the figure (indicating with (f)) of the directional characteristic when 100% rated value is applied to all LED optical units 26 and obtains greatest optical output and the figure (indicating with (h)) of the directional characteristic when 50% rated value is applied to all LED optical units 26 and obtains optics output.As shown in the drawing, when whole optics output (h) reduced less than (f), the shape of the shape of the directional characteristic of this LED lighting device 34 (h) and directional characteristic (f) much at one.
Figure 19 illustration will have an above-mentioned directional characteristic a plurality of LED lighting devices 34 every the result of 35m (D) with height 10m (H) optics emulation luminance distribution on the road surface when curb is arranged.As shown in the figure, with the direct of travel setting of LED lighting device 34 along vehicle.As shown in the drawing, each LED lighting device 34 can utilize have symmetrical luminous intensity distribution, along the direction of more close vehicle with along the road surface of throwing light on of the light away from the direction emission of traveling vehicle.Promptly, for the zone, road surface 46 that is positioned between the adjacent LED lighting device 34, the light of the direction of the more close traveling vehicle of launching from a LED lighting device 34a in edge is with the light away from the direction of traveling vehicle overlaps each other from edge that another LED lighting device 34b launches.The light of this overlapping is entered driver's eyes by road surface diffusion and reflection, thereby helps the driver to discern pavement state.
When vehicle when advancing the night of no rain, the driver can have road vision that the light of aforesaid luminous intensity distribution throws light on to confirm the pavement behavior of vehicle front by apparatus.This can guarantee to come safety to advance with high-visibility.
On the other hand, when vehicle was advanced in rainy night, can be by the minute surface that causes because of the accumulation rainwater towards the direction reflection relative from the edge that LED lighting device 34b launches with vehicle away from the light of the direction (direction relative) of vehicle with vehicle.This means that reverberation may not can enter driver's eyes.That is, the light of the direction of the more close vehicle of only launching from LED lighting device 34a in edge just can and enter driver's eyes from 46 reflections of zone, the road surface between adjacent LED lighting device 34.With compare in the situation that does not have to advance under the situation of rainfall, the pavement behavior that the driver must utilize road surface brightness to reduce is carried out visual confirmation.Will be understood that this may influence safe driving.
It should be noted that the illumination intensity (emitting light flux) that each LED lighting device 34a (34b) will throw light on is constant all the time, and with whether rainfall is irrelevant.Yet, during raining, can not the visibility of driver's road pavement be contributed from the light of the edge that each LED lighting device 34a (34b) the launches direction relative with vehicle, this means and can not use this light effectively.Therefore, generate unwanted light and consumed certain quantity of energy simultaneously.
In view of this general issues, this LED lighting device can contribute to improving the road surface visibility, and can not waste from the light of LED lighting device emission, thereby guarantees driver's high security.And, can suppress the energy consumption of the generation and the waste of any unwanted light, obtain high energy-saving effect simultaneously.
Specifically, as shown in figure 17, can detect condition of road surface (surrounding environment) in real time by timer 43, brightness detector 44 and the rainfall detector 45 that is installed in the light control circuit 40 in the LED lighting device, with detected signal delivery to optics o controller 42.
Figure 20 illustration raining or not have under the rainy situation, according to the directional characteristic of the LED lighting device 34 of deriving based on the optics emulation of the light distribution characteristic of LED lighting device.This figure has comprised under the situation that does not have to rain the figure (indicating with (f)) of the directional characteristic when 100% rated value is applied to all LED optical units 26 and obtains greatest optical output, and controls the figure (indicating with (c)) of the directional characteristic of corresponding LED optical unit 26 so that corresponding particular optical output to be provided between flush period discretely.
As shown in the drawing, the shape of the directional characteristic (f) of LED lighting device 34 is almost symmetrical or similar with respect to 0 ° of deflection as the center in the absence of raining.In contrast, the shape of the directional characteristic of LED lighting device 34 (c) is asymmetric with respect to 0 ° of deflection as the center between flush period.In this case, will become from the 34 emitted light beams assignments of LED lighting device: with respect to as 0 ° of the deflection at center, a side (using "+" deflection to represent in the figure) is more than opposite side (using "-" deflection to represent in the figure).
Figure 21 illustration when LD lighting device 34 is designed to have this directional characteristic, the result of the optics emulation luminance distribution on the road surface.In Figure 20, when being the center with LED lighting device 34, a side of representing with "+" deflection is corresponding to the direction of the more close vehicle of Figure 21, and uses a side that "-" deflection represents corresponding to the direction relative with vehicle.That is, each LED lighting device 34a and 34b can launch more light beam along the direction of more close vehicle, and along the direction emission less light beam relative with vehicle.
Therefore, project light beam on the road surface and mainly comprise, and suppressed along the light beam of the direction relative with vehicle from the light beam of the direction of the more close vehicle in edge of each LED lighting device 34a and 34b emission.Therefore, even vehicle rainy night advance and because of the accumulation rainwater on the road surface, form specular surface, all reflected effectively and enter driver's eyes from nearly all light beam of each LED lighting device 34a and 34b emission, thereby wasted very a spot of light beam by the mirror-like face.Owing to suppressed to generate the waste light beam that is helpless to improve driver's visibility, thereby the LED lighting device can be configured to provide high energy-saving effect.
In a demonstration embodiment, owing to controlled each the LED optical unit that constitutes the LED lighting device discretely, thereby, can can be controlled to 50% to 0% of emission greatest optical output along the radiative LED optical unit of the direction relative simultaneously with being controlled to 100% to 50% (be with respect to the maximum rating that is applied optics output) of emission greatest optical output at 100% o'clock along the radiative LED optical unit of the direction of more close vehicle with vehicle.Alternatively, according to the particular ambient environmental aspect, all LED optical units can provide the output of 100% optics.
As set forth, led light source and distribution controls lens have formed the optical system of using in the employed LED optical module in the LED lighting device of the present invention.This structure has been exempted use will be directed to the reflector of wishing illumination direction from the light of light source, obtained such as advantages such as reduction number of components, high assembly precision and reduction lighting device weight.
The spherical light incident surface of distribution controls lens is around led light source, be used for increasing the light quantity that enters into the distribution controls lens by light incident surface with from LEG light source radial emission and arrive the ratio of the light quantity of light incident surface.As a result, realized effective use of light.
In LED optical module of the present invention, the light emission surface of distribution controls lens is made of variform a plurality of continuous free bends surface, thereby makes and can both provide light distribution characteristic to each part in a plurality of parts that limit from the light of each free bend surface emitting the field of illumination.This structure makes it possible to be provided with in detail the light distribution characteristic of LED optical module, thus, has increased the free degree of design light distribution characteristic significantly.
According to the present invention, can constitute dissimilar LED optical module by replacing the distribution controls lens, and a plurality of LED optical modules that will have an identical or different light distribution characteristic make up and constitute the LED optical unit with different light distribution characteristics.Compare with separate modular, this LED optical unit can provide more substantial illumination light.With single LED optical module similarly be, this structure also can be provided with the light distribution characteristic of LED optical unit in detail, has increased the free degree of design light distribution characteristic thus significantly.
According to the present invention, a plurality of LED optical units that will have identical or different light distribution characteristic make up and constitute the LED lighting device.In this structure, each part in a plurality of parts that limit in the big field of illumination can be come the specific light distribution characteristic of assignment by specific LED optical unit.Similarly be under the situation with LED optical unit, this structure not only can at length be provided with the light distribution characteristic of LED lighting device on big field of illumination, and the uniform luminance that can guarantee to spread all over this field of illumination.Thereby, improved the free degree that designs light distribution characteristic significantly.
LED lighting device of the present invention can be according to current ambient conditions and various light distribution characteristics is provided with it adaptably.Owing to reduced to be helpless to the waste light beam of the function of lighting device, thereby the LED lighting device can be arranged to provide high energy-saving effect.
When with LED lighting device of the present invention when the road lighting, its can be during raining with the brightness that the is higher than conventional lighting device road surface of throwing light on.Therefore, LED lighting device of the present invention can strengthen the security of driver's visibility.And, when only exporting when improving visibility by increasing total optics simply, consumed power can be reduced about conventional consumed power 50% or below.
When LED lighting device of the present invention is thrown light on as the parking lot, can detect and comprise the people that enters the field of illumination or the ambient conditions of other vehicle, to increase its optics output so that carry out brighter illumination of moment, thus, guaranteed the safety purpose of anti-theft measure (also for) in should the zone.After this people or vehicle left this zone, this LED lighting device can be controlled function by it and suppress optics output, to realize high energy-saving effect.And, when with this LED lighting device as parking lot when illumination, the LED optical unit of the approach axis of the parking vehicle that is used to throw light on can be controlled to the light beam that emission has increased optics output, control the light distribution characteristic of this LED lighting device thus.This can realize the effective lighting in parking lot.
Claims (5)
1, a kind of LED lighting device, this LED lighting device comprises:
One group of LED optical unit with different light distribution characteristics, each LED optical unit all comprises at least one the LED optical module that is used to form corresponding light distribution characteristic, described LED optical module comprises LED that is used as light source and the distribution controls lens of arranging along the illumination direction of this led light source, the LED optical module that is installed on the same LED optical unit is same type, and the LED optical module that is installed on the different LED optical unit differs from one another, wherein
Described LED lighting device also comprises light control unit, and this light control unit comprises:
The environmental aspect detecting unit is used to detect the surrounding environment of described LED lighting device;
LED optical unit driving/control module is used to control the optics output of each described LED optical unit; And
The optics output control unit is used for sending optics output control signal to described LED optical unit driving/control module, and this optics is exported control signal with corresponding from the detection signal of described environmental aspect detecting unit, and
Wherein, based on detection signal from described environmental aspect detecting unit, control respectively by being subjected to the optics of each described LED optical unit to be exported, thereby can control the light distribution characteristic of described LED lighting device from the described LED optical unit drivings/control module that described optics output control unit is sent the optics output control signal control that comes.
2, LED lighting device according to claim 1, wherein, described distribution controls lens comprise the light from described LED incide on it incidence surface and to the radiative light emission surface in outside, described incidence surface and described light emission surface all along illumination direction with respect to described LED bending, to form roughly convex profile;
The focus of described distribution controls lens is positioned near part that described LED places or its; And
Described light emission surface comprises variform a plurality of continuous free bends surface.
3, LED lighting device according to claim 2, wherein, the described light emission surface of described distribution controls lens has the shape that along assigned direction light is reflected in a continuous manner according to the incidence angle from the light of the focus of described distribution controls lens.
4, according to each described LED lighting device in the claim 1 to 3, wherein, described LED optical unit driving/control module comprises constant current circuit.
5, according to each described LED lighting device in the claim 1 to 4, wherein, described environmental aspect detecting unit comprises brightness detector at least and/or is used to detect the rainfall detector of rainfall.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2008231320 | 2008-09-09 | ||
| JP2008231320A JP2010067415A (en) | 2008-09-09 | 2008-09-09 | Led lighting fixture |
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| CN101672433A true CN101672433A (en) | 2010-03-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910002284A Pending CN101672433A (en) | 2008-09-09 | 2009-09-09 | Led lighting device |
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| CN (1) | CN101672433A (en) |
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| CN113330251A (en) * | 2018-11-27 | 2021-08-31 | 勒克斯Led照明有限公司 | LED lighting device for cultivation surface |
| CN111445812A (en) * | 2020-03-16 | 2020-07-24 | 江西晶蓝科技有限公司 | Bus stop board light self-adaptation display device based on light energy power generation |
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