CN103261778B - Bulb-shaped LED light source - Google Patents
Bulb-shaped LED light source Download PDFInfo
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- CN103261778B CN103261778B CN201180060008.1A CN201180060008A CN103261778B CN 103261778 B CN103261778 B CN 103261778B CN 201180060008 A CN201180060008 A CN 201180060008A CN 103261778 B CN103261778 B CN 103261778B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/20—Light sources comprising attachment means
- F21K9/23—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings
- F21K9/232—Retrofit light sources for lighting devices with a single fitting for each light source, e.g. for substitution of incandescent lamps with bayonet or threaded fittings specially adapted for generating an essentially omnidirectional light distribution, e.g. with a glass bulb
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V3/00—Globes; Bowls; Cover glasses
- F21V3/04—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings
- F21V3/06—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material
- F21V3/062—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics
- F21V3/0625—Globes; Bowls; Cover glasses characterised by materials, surface treatments or coatings characterised by the material the material being plastics the material diffusing light, e.g. translucent plastics
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V29/00—Protecting lighting devices from thermal damage; Cooling or heating arrangements specially adapted for lighting devices or systems
- F21V29/50—Cooling arrangements
- F21V29/70—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks
- F21V29/74—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades
- F21V29/77—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section
- F21V29/773—Cooling arrangements characterised by passive heat-dissipating elements, e.g. heat-sinks with fins or blades with essentially identical diverging planar fins or blades, e.g. with fan-like or star-like cross-section the planes containing the fins or blades having the direction of the light emitting axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2105/00—Planar light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- Non-Portable Lighting Devices Or Systems Thereof (AREA)
- Led Device Packages (AREA)
Abstract
[problem] provides a kind of bulb-shaped LED light source, can improve the luminance uniformity in outer tube globe, in other words, can reduce the generation of light inhomogeneities when not lowering efficiency.[method of dealing with problems] is according to the feature of bulb-shaped LED light source of the present invention, at least n(natural number 4 or more) individual LED element (4) is located in outer tube globe (5) in the mode of plane substantially; The Light distribation angle of each LED element (4) is at least 60 ° and 120 ° or following; Light distribation region in Light distribation angle is overlapping, and in Light distribation region, each LED element (4) light shines on the inner surface of outer tube globe (5); Part overlap comprises n overlapping Light distribation region, and n overlapping Light distribation region comprises at least 10% of outer tube globe (5), is no more than the inner surface of 80%.
Description
Technical field
The present invention relates to bulb-shaped LED light source.
Background technology
In bulb-shaped light source, outer tube globe reduces intrinsic transmissivity, therefore, from the angle of luminous efficacy, has the opposite effect, but LED(light emitting diode) there is high brightness, therefore for can dazzle be produced during general illumination.In order to suppress dazzle, it is known that arrange the milky outer tube globe with light diffusion effect in the front of LED light source.
Such as, Fig. 7 is the sectional view of conventional LED bulb 200.The object of LED bulb 200 is to provide a kind of LED bulb, use this LED bulb, in wider field of illumination, the white light with uniform luminance is obtained by easy configuration, simply can change light distribution pattern, directly it directly can be connected with general commercial power supply, can be compatible with conventional incandescent lamp bulb.
LED bulb 200 comprises lid 202, and lid 202 one end is provided with metal cap 201, widens with the tubaeform opening to the other end; Outer tube globe 205, has optical diffusion layer 206 within it on the surface, is assemblied on the opening of lid 202; Substrate 203, be located at basic on spherical body 207, body 207 is made up of lid 202 and outer tube globe 205; LED element 204, is arranged on the outer surface of substrate 203 bulb 205 toward the outside.Further, outer tube globe 205 also can comprise the homogeneous material (such as, polypropylene) with light diffusion effect.
Further, substrate 203 is sheet, parallel with the outer surface of the opening of lid 202.In other words, multiple LED element 204 is located at (such as, see patent document article 1) in planar substrate 203.
[prior art document]
[patent document]
[patent document article 1] Japanese Patent Publication 2001-243807
Summary of the invention
[the problem to be solved in the present invention]
Adopt this LED bulb 200, the bright outer tube globe 205 of the illumination that LED element 204 sends, in some region, light that multiple LED element 204 sends is overlapping, and other parts are in and are illuminated outside region.In other words, there is the problem of brightness irregularities.
Further, because LED element 204 is located at towards on the same substrate 203 of same illumination direction, even if the shape of commodity and bulb seem identical, light distribution property and bulb or bulb-shaped fluorescent lamp completely different, because the light sent only concentrates on a direction, vertical with the surface of substrate 203, as spotlight.Conventionally, if be the alternative source of light in the illuminating equipment of incandescent lamp bulb as light source, there is such shortcoming: the illumination intensity distribution in whole room changes greatly, in general, compared with the situation before replacing it, ceiling and wall become very dark.
Further, during light source as shot-light, the distribution of light on wall is considered to not particular importance, and therefore Light distribation tends to concentrate along axis, make directly under illumination intensity identical with incandescent lamp bulb.In this case, relatively with the component of point lighting of central axis to reduce, wherein divide the component of lighting easy diffusion, and be easy to incur loss in outer tube globe 205, therefore luminous efficacy increases, but only the center of light-emitting area has high brightness, luminance uniformity on outer pipe surface reduces, therefore there is such shortcoming: produce inhomogeneities, in addition, dark wall also becomes more obvious.
Further, by the quantity of n(LED element 204, wherein, n is natural number) be set to very large value and seem to solve the problem.But, in practice, a large amount of LED element 204 can not be set on the surface of substrate 203 with limited surface area, in addition, from the angle of cost, marketability can decline, and further, temperature can become too high, reduce the working life of LED element 204, greatly sacrifice the feature of LED, that is, the characteristic of its long working life.
Increase the diffusion of outer tube globe 205, reduce its transmissivity, can luminance uniformity be improved, but this also can cause the decline of the luminous efficacy of lamp own.
The factor affecting luminous efficacy is, by the diffusion filter (outer tube globe 205) vertical with the optical axis of illumination light, nearly all light enters and by filter media, decayed simultaneously.This is called line transmission.But if light tilts to enter filter, in an angle between its optical axis and filter, a part of light can be reflected, and cannot enter filter medium.When using LED bulb 200, at the further multiple reflections of light of outer tube globe 205 internal reflection, and be divided into and be irradiated to the light outside outer tube globe 205 and the light in outer tube globe 205 internal loss.In other words, adopt the part with not vertical with optical axis outer tube globe 205, internal losses increases along with the increase of low incidence angle part, and total luminous efficacy declines.Therefore, if multiple LED with narrower Light distribation angle are arranged in planar fashion, plane diffusing panel and all LED light axle at right angle settings, above-mentioned loss can decline, but as the substitute of incandescent lamp bulb, its performance will weaken.
If the use of LED bulb 200 is more universal in future, product is developed out has multiple light distribution pattern, and user can according to application choice product.But current, due to cost, selling price and pin quantitative limitation, in fact, the product without multiple light distribution pattern can be used, and major design strategy is, make directly under illumination intensity and existing incandescent lamp bulb equal.We have studied " directly under illumination intensity ", balance between " distribution on wall " and the element of " luminance uniformity (the disappearance degree of uneven brightness) of light source itself ", to reach the optimum state of actual use.Therefore, object is, is not increasing the intrinsic efficiency of LED element 204, is not increasing the light be distributed on wall, keep simultaneously directly under illumination intensity when, by optimizing the location mode of current light summation, with broaden application field.
The object of the present invention is to provide a kind of luminance uniformity improved in the outer tube globe similar to incandescent lamp bulb, in other words, the bulb-shaped LED light source of the generation of light inhomogeneities can be reduced when not lowering efficiency, solving such as the problems referred to above thus.
Further, can conceive so a kind of design means: use multiple LED element, each Light distribation angle is according to circumstances different.But adopt and industrial process can be made in this way very complicated, and, even if the total quantity of the LED element used is identical, also have number of different types, therefore, the ability of batch production can decline, and cost can increase, the delivery cycle preparing material can extend, and therefore, prerequisite is not adopted in this way.
Further, it is contemplated that this method: the optical axis of each LED changes when not changing Light distribation angle, my company by its commercialization, ParathomClassicA by name.But from industrial point of view, the problem of this method is, LED cannot directly be installed on the surface of single substrate, so there is no comprise in our study.
Therefore, in order to solve current problem, the method for designing that will adopt is limited to this design: all LED element have same light distribution angle, eliminate the sophisticated identification of LED element or the needs of different purposes, LED element is installed with equal illumination direction on substrate, and all optical axises are all in the direction vertical with substrate surface.
Herein, design is preferably, the light of lower semisphere is uniformly distributed, episphere has similar Light distribation, but in fact, also there is not the LED element meeting this demand at present, therefore, our target is this design: the Light distribation of lower semisphere is even as far as possible, directly under illumination intensity distribute to a certain extent.
Further, the line transmission rate of outer tube globe is set to about 90%.But this transmissivity is a kind of basic and the present invention's independently phenomenon, and advantage of the present invention is not limited to 90%.
As shown in Figure 8, if the luminous intensity on the central shaft of LED element is defined as 100%, Light distribation angle is the two dimension angular of the angle of 50% of the value dropped to from central shaft to luminous intensity on central shaft, wherein, the angle ranging from the angle from the central shaft viewed from the centre of luminescence of LED.In other words, in the angle of central shaft both sides, luminous intensity all drops to 50%.Therefore, although a small amount of illumination is mapped to outside this region in practice, Light distribation region is defined as the region in the Light distribation angle of LED in this article, to make design verification unambiguously clear and definite.
[technological means of dealing with problems]
According to bulb-shaped LED light source of the present invention, such light source has built-in illuminating circuit, available source power supply is lighted, at about 2nSt(surface of sphere) scope in luminous, use LED(light emitting diode) unit as light source, there is electric light blister outward appearance, not there is the wider light distribution range of bulb, as the alternative source of light of incandescent lamp bulb with E or Type B metal cap, imitate incandescent lamp bulb further and be provided with outer tube globe in LED light source front, it is characterized in that:
At least n(natural number 4 or more) individual LED element to be located in outer tube globe on the basic same surface for plane substrate;
The Light distribation angle of each LED element is at least 60 ° and 120 ° or following, and the central shaft of Light distribation angle is that the surface of plane substrate is vertical with above-mentioned substantially;
Light distribation region in Light distribation angle is overlapping, and in Light distribation region, each LED element light shines on the inner surface of above-mentioned outer tube globe; A part (comprising the part on the inner surface of above-mentioned outer tube globe on lamp central shaft) for above-mentioned overlap comprises n overlapping Light distribation region, and n overlapping Light distribation region comprises at least 10%, is no more than the inner surface of 80% outer tube globe.
According to bulb-shaped LED light source of the present invention, it is characterized in that, the region do not comprised in the Light distribation region of any LED element is less than 30% of the inner surface of outer tube globe.
[invention advantage]
Using according to bulb-shaped LED light source of the present invention, by adopting above-mentioned configuration, the luminance uniformity in outer tube globe can be improved when not lowering efficiency, in other words, reduce the generation of light inhomogeneities.
Accompanying drawing explanation
[Fig. 1] shows the mode of embodiment 1, is the side view (a) of bulb-shaped LED light source 100 and the schematic diagram of front view (b).
[Fig. 2] shows the mode of embodiment 1, is the schematic diagram of the light distribution property of bulb-shaped LED light source.
[Fig. 3] shows the mode of embodiment 1, the schematic diagram in Light distribation region during quantity n=3 for LED element in outer tube globe.
[Fig. 4] shows the mode of embodiment 1, the schematic diagram in Light distribation region during quantity n=4 for LED element in outer tube globe.
[Fig. 5] shows the mode of embodiment 1, the schematic diagram in Light distribation region during quantity n=5 for LED element in outer tube globe.
[Fig. 6] is comparative example 1 to 7 and the design parameter of embodiment 1 to 4 and the schematic diagram of assessment result.
[Fig. 7] is the sectional view of conventional LED bulb 200.
[Fig. 8] is for defining the schematic diagram of the Light distribation angle of LED element.
Detailed description of the invention
The mode of embodiment 1.
Fig. 1 to Fig. 6 is the schematic diagram of the mode of embodiment 1, and wherein, Fig. 1 is side view (a) and the front view (b) of bulb-shaped LED light source 100; Fig. 2 is the schematic diagram of the light distribution property of bulb-shaped LED light source; The schematic diagram in Light distribation region when Fig. 3 is the quantity n=3 of LED element in outer tube globe; The schematic diagram in Light distribation region when Fig. 4 is the quantity n=4 of LED element in outer tube globe; The schematic diagram in Light distribation region when Fig. 5 is the quantity n=5 of LED element in outer tube globe; Fig. 6 is the design parameter of comparative example 1 to 7 and embodiment 1 to 4 and the schematic diagram of assessment result.
As shown in Figure 1, bulb-shaped LED light source 100 is provided with heat dissipation metal parts 2, and described heat dissipation metal parts 2 one end is provided with metal cap 1, widens with the tubaeform opening to the other end.It comprises thermal component 2, outer tube globe 5, its inner surface has optical diffusion layer 6 and be assemblied on the opening of lid 2, be located at by thermal component 2 and outer tube globe 5 form basic be the substrate 3 in spherical body 7, and, be arranged on the LED element 4 on the outer surface of the substrate 3 of bulb 5 toward the outside.
Bulb-shaped LED light source 100 in present example mode has following characteristic.
(1) light source is LED element 4(light emitting diode).
(2) there is bulb-shaped outward appearance (see figure 1).
(3) do not have the wider light distribution range of bulb, be that one has built-in illuminating circuit, available source power supply is lighted, at about 2nStRad(surface of sphere) scope in luminous light source.
(4) be the alternative source of light of the incandescent lamp bulb with E type metal cap (such as, E26 metal cap or E17 metal cap) or Type B metal cap (as described in JISC7709-1), imitate incandescent lamp bulb, in LED light source front, there is outer tube globe 5 further.
(5) at least n(natural number 4 or more) individual LED element 4 is located on the same surface of substrate 3 in outer tube globe 5 in plane mode.
(6) light distribution property (Light distribation angle) of each LED element 4 is at least 60 ° and 120 ° or following (details of Light distribation angle is see Fig. 2 and Fig. 8).It should be noted, adopt the LED element 4 of 120 ° or more, Light distribation angle is wider, light angle for adopt outer tube globe 5 light source wide, this is because although do not have serious uneven brightness problem, the loss in outer tube globe 5 is larger, efficiency as light source is lower, be difficult to increase directly under illumination intensity.
(7) the Light distribation region of each LED element 4 is overlapping, and in Light distribation region, illumination is mapped on the inner surface of outer tube globe 5.
(8) described overlap comprises the part of n Light distribation region overlap, and the part of described n Light distribation region overlap forms at least 10% of the inner surface of outer tube globe 5.
(9) region (hereinafter referred to as zero is overlapping) do not comprised in the Light distribation region of any LED element 4 is less than 30% of the inner surface of outer tube globe.
Show the research of the reason of the uneven brightness in the outer tube globe 205 of conventional LED bulb 200, two reasons that uneven brightness produces are as follows.
(1) light that specific LED element 204 sends irradiates with special angle, but different from the distance of the inner surface of outer tube globe 205 in each LED element 204 to irradiation area.
(2) there is the region of the light overlap that multiple LED element 204 sends, also there is nonoverlapping region.
The result of a series of researchs that the present inventor carries out shows, in light inhomogeneities, the effect of the former (1) is less than the latter (2).
The result of a series of research shows further, if Light distribation is overlapping about a point symmetry, inhomogeneities is relatively not too obvious.
In order to improve the luminance uniformity in outer tube globe 5, the present inventor is studied the latter (2).Result as shown in Figure 6.It should be noted, the comparative example 1(1 in Fig. 6) to comparative example 6(6) and embodiment (7) to (9) corresponding to (9) with (1) in Fig. 3 and Fig. 4, embodiment (11) is corresponding with (11) in Fig. 5.Comparative example 7(10 in Fig. 6), eliminate the corresponding schematic diagram in the Light distribation region in display outer tube globe 5.Comparative example 6(6 in display Fig. 4 (6)) Light distribation region schematic diagram in, the LED element 4 be located on concentric circles position moves to center.
The light that n LED element 4 sends produces the Maximum overlap in n overlapping Light distribation region.According to setting and the selected Light distribation angle of LED element 4, Maximum overlap quantity can be less than n.Herein, distance between the inner surface of LED element 4 and outer tube globe 5 is only in extremely limited scope, the reason causing bigger difference cannot be become, therefore, the quantity in overlapping Light distribation region is often depended in brightness, instead of from LED element 4 to the difference of the distance of the irradiated inner surface of outer tube globe 5.
Further, the situation that the brightness from the center of outer tube globe 5 to its circumference declines gradually does not generally think uneven brightness, and in other words, people can not feel well to the gradual change of brightness.Under study for action, luminance uniformity is also quantitatively assessed its change not by the brightness in the outer tube globe 5 of repetitive measurement single source and assesses, but the relevant sensory evaluation of uneven brightness perceived during by observing actual light source and measuring, wherein, if tester does not feel well, assignment is X, if feel that some are uncomfortable, assignment is Δ, if no problem, then assignment is O.Design standard is set to, and assignment is the region of ' O ' is the level that can meet market.
Therefore, in order to increase luminance uniformity, importantly, select to have the LED element 4 of larger Light distribation angle, use a large amount of n LED element 4, be located at substrate 3 center and/or with on the circle of the centres of substrate 3, and make zero overlapping region narrower.On the other hand, in order to increase directly under illumination intensity, importantly, be located at there being n overlapping Light distribation layer on the axis of lamp (bulb-shaped LED light source 100).In order to increase the luminous efficiency of whole lamp, importantly, the LED element 4 adopting Light distribation angle narrow as far as possible.
Reaching customer satisfaction in order to the proposal by these contradictions of balance, preferably, is natural number by the quantity n(n of LED element 4) be at least set to four or more.As shown in Figure 3, if the quantity n of LED element 4 is three, require that LED element 4 has the Light distribation angle of non-constant width, therefore, the loss in outer tube globe 5 increases, and the luminous efficacy of whole lamp (bulb-shaped LED light source 100) cannot be satisfactory.
Further discovery, if the quantity n of LED element 4 is three, luminance uniformity and point symmetry are merged the setting that can cause in the design as shown in Figure 3, wherein, the overlap on central point is a problem, and can not reach higher directly to lower illumination intensity.Therefore, n is preferably four or more.Employing 90 °, in the comparative example of n=3, the overlapping quantity n=3 in Light distribation region that center produces, but gratifying luminance uniformity cannot be obtained and directly to lower illumination intensity simultaneously.
If light angle is wider, n overlapping Light distribation regional compare easily produces, and but then, the illumination loss in outer tube globe 5 increases, and therefore, Light distribation angle (being θ 1 in Fig. 2) is preferably 120 ° or following.In addition, if light angle is narrow, be difficult to produce n overlapping region, therefore, Light distribation angle is preferably at least 60 °.
Increasing directly to lower illumination intensity is also an important design considerations, the outer tube globe 5 on the center line of lamp (bulb-shaped LED light source 100) should have n overlapping Light distribation region at least.
Further, cannot obtain substantially gratifying directly to lower illumination intensity, unless n overlapping Light distribation region in outer tube globe 5 accounts for overall at least 10%.Meanwhile, if LED element 4 is located on concentric circles position, during visualization, uneven brightness is not too obvious.
For all LED element 4, use the typical white LED element comprising the blue led be combined with yellow fluorescence, the output of each unit is 1001m, and rated disspation is 1W.Subsequently, prepare five types, they are uniquely distinguished and are Light distribation angle, adopt the Light distribation angle of 30 °, 60 °, 90 °, 120 ° and 150 °, unit to be located in the 55mm diameter printed substrate 3 shown in Fig. 1 in the heart, in some cases, on position about described unit symmetry on the concentric circles that multiple LED element 4 is located at the center of substrate 3, there is with the mode manufacture of experiment the bulb-shaped LED (bulb-shaped LED light source 100) of the type of E26 metal cap, and carry out comparative evaluation.
Do not illustrate herein, but, because the temperature of substrate 3 raises, enough heat eliminating mediums are set in metal cap 1 side of substrate 3.Further, in all experimental lamps, employing diameter is 60mm, and line transmission rate is 90%, white glass outer tube globe 5, described white glass outer tube globe comprises shown in Fig. 1, inner surface is coated with the outer tube globe 5 of fine silica powder.
In order to the parameter of carrying out zero overlapping region compares, produce trial product, wherein the ratio of zero overlapping region changes along with the change of above-mentioned concentric circles radius.The quantity n of LED element 4 is different, but all lights by rating number.Certainly, because the quantity n of LED element 4 increases, the total light flux of the lamp completed also increases.But, in current experiment, total light flux disunity, but use n LED element 4 just can standardization (in other words, divided by W, can relative assessment be carried out).Therefore, provide a unit 1W power (note, do not consider power loss in calculating) to LED element 4, if there are five unit, then provide 5W power.
In order to relative efficiency, use the total light flux of integrating sphere experiments of measuring lamp, and represent with relative value, wherein, when outer tube transmissivity is 0.9, when the quantity of the LED element 4 adopted is n, 100% is defined as theoretical efficiency (unit: lm/W), is expressed as: specified output 100(lm/ element) an xn(element)/n(W) x0.9(outer tube transmissivity).
Certainly, high efficiency is preferred efficiency, and at least 90% is regarded as satisfactory value.Further, uneven brightness in outer tube globe 5 is called luminance uniformity, preferably, brightness should a little go up evenly, but, different as the bulb-shaped fluorescent lamp of light source from use fluorescent lamp, in fact, outer tube globe 5 cannot realize uniform luminance, because light source is very little, there is higher brightness, and there is certain Light distribation angle.The satisfaction that user experiences is different according to the difference of the attainable uniformity.
Further, about directly under illumination intensity, experimental lamps is lighted with substrate state upwards, uses illumination photometer to measure illumination intensity lm below lamp, by by total wattage of lamp divided by the illumination intensity measured, a value can be obtained.In other words, if the 4W using four LED element 4 is 52l directly to lower illumination intensity, 52/4=13(lx/W is defined as directly to lower illumination intensity).In general, 10(lx/W is at least directly to lower illumination intensity) be gratifying value.Certainly; if design identical, this can increase in the mode proportional with the total power consumption of lamp usually, therefore; required directly to lower illumination intensity in order to make user obtain, user should adjust the quantity of the wattage of bulb-shaped LED (bulb-shaped LED light source 100) or the lamp of adjustment use.
In an embodiment, a LED element 4 is located at the centre of substrate 5, but does not need necessarily to be located at centre.Further, the transmissivity of outer tube globe 5 is not limited to 90%, and in addition to glass, material also can be resin.LED element 4 is located on concentric circles, so that compare.
[reference number explanation]
1 metal cap, 2 lids, 3 substrates, 4LED element, 5 outer tube globe, 6 optical diffusion layers, 7 substantially be spherical body, 100 bulb-shaped LED light sources, 200 bulb-shaped LED light sources, 201 metal caps, 202 lids, 203 substrates, 204LED element, 205 outer tube globe, 206 optical diffusion layers, 207 are spherical body substantially.
Claims (2)
1. a bulb-shaped LED light source, described light source is the light source of such type, it has built-in illuminating circuit and available source power supply is lighted, described light source is luminous in the scope of about 2 π surface of spheres, and use LED element (light emitting diode) as light source, there is electric light blister outward appearance and not there is the wider light distribution range of bulb, as the alternative source of light of incandescent lamp bulb with E or Type B metal cap, further imitation incandescent lamp bulb has outer tube globe in LED light source front, it is characterized in that:
At least n described LED element is located in described outer tube globe on the basic same surface for plane substrate, and wherein, n is natural number 4 or more; The Light distribation angle of each described LED element is 60 ° to 120 °, and the central shaft of described Light distribation angle is that the described surface of plane substrate is vertical with described substantially;
Light distribation region in described Light distribation angle is overlapping, and in described Light distribation region, each described LED element light shines on the inner surface of described outer tube globe;
The part comprised on the described inner surface of described outer tube globe on the described central shaft of lamp of described overlap comprises the heavy folded described Light distribation region of n, and the heavy folded described Light distribation region of n comprises at least 10% of described outer tube globe, is no more than the described inner surface of 80%.
2. bulb-shaped LED light source according to claim 1, is characterized in that, the region do not comprised in the described Light distribation region of any described LED element is less than 30% of the described inner surface of described outer tube globe.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2010-276083 | 2010-12-10 | ||
| JP2010276083A JP5628017B2 (en) | 2010-12-10 | 2010-12-10 | Light bulb shaped LED light source |
| PCT/EP2011/070826 WO2012076339A1 (en) | 2010-12-10 | 2011-11-23 | Bulb - shaped led light source |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103261778A CN103261778A (en) | 2013-08-21 |
| CN103261778B true CN103261778B (en) | 2016-04-13 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201180060008.1A Expired - Fee Related CN103261778B (en) | 2010-12-10 | 2011-11-23 | Bulb-shaped LED light source |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP2649364B1 (en) |
| JP (1) | JP5628017B2 (en) |
| CN (1) | CN103261778B (en) |
| WO (1) | WO2012076339A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI498507B (en) * | 2012-08-08 | 2015-09-01 | Wintek Corp | Bulb lamp structure |
| JP6136196B2 (en) * | 2012-10-31 | 2017-05-31 | 岩崎電気株式会社 | lamp |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202010004316U1 (en) * | 2010-03-29 | 2010-06-10 | Chicony Power Technology Co., Ltd., Wu-Ku | LED bulb of the bulb type and cooling structure |
| CN201651940U (en) * | 2010-05-04 | 2010-11-24 | 浙江铭洋照明科技股份有限公司 | LED bulb for indoor lighting |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001243807A (en) | 2000-02-28 | 2001-09-07 | Mitsubishi Electric Lighting Corp | Led electric bulb |
| US7334918B2 (en) * | 2003-05-07 | 2008-02-26 | Bayco Products, Ltd. | LED lighting array for a portable task light |
| CA2641832C (en) * | 2006-02-27 | 2012-10-23 | Illumination Management Solutions Inc. | An improved led device for wide beam generation |
| JP2010073438A (en) * | 2008-09-17 | 2010-04-02 | Panasonic Corp | Lamp |
| US20100277067A1 (en) * | 2009-04-30 | 2010-11-04 | Lighting Science Group Corporation | Dimmable led luminaire |
-
2010
- 2010-12-10 JP JP2010276083A patent/JP5628017B2/en active Active
-
2011
- 2011-11-23 WO PCT/EP2011/070826 patent/WO2012076339A1/en active Application Filing
- 2011-11-23 EP EP11790589.3A patent/EP2649364B1/en active Active
- 2011-11-23 CN CN201180060008.1A patent/CN103261778B/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE202010004316U1 (en) * | 2010-03-29 | 2010-06-10 | Chicony Power Technology Co., Ltd., Wu-Ku | LED bulb of the bulb type and cooling structure |
| CN201651940U (en) * | 2010-05-04 | 2010-11-24 | 浙江铭洋照明科技股份有限公司 | LED bulb for indoor lighting |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103261778A (en) | 2013-08-21 |
| JP5628017B2 (en) | 2014-11-19 |
| WO2012076339A1 (en) | 2012-06-14 |
| EP2649364A1 (en) | 2013-10-16 |
| EP2649364B1 (en) | 2015-07-15 |
| JP2012124124A (en) | 2012-06-28 |
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