CN102865468A - Light emitting bulb - Google Patents

Abstract

The invention relates to a light emitting bulb which comprises a light source and a shade body, wherein the light source is used for emitting light; the shade body is used for defining an internal space, and the light source is arranged in the shade body and is in heat conduction connection with the shade body; the shade body is made of a heat conduction material and can be used for reflecting light emitted by the light source into the internal space; and a plurality of through holes are formed in the shade body to ensure that the light emitted by the light source arranged in the shade body is emitted from the through holes.

Description

Emitting bulb

Technical field

The invention relates to a kind of light fixture, and particularly about a kind of emitting bulb.

Background technology

Light emitting diode (LED) reaches more than the 150lm/w owing to its luminous efficiency, and does not contain again environmental protection of mercury, is used gradually the principal light source that is used as throwing light on.Yet, utilize at present the LED bulb of led light source, if as replacing " osram lamp " or so-called " Electricity-saving lamp bulb ", it is technical still following difficulty:

One. light emitting anger is too little:

Light emitting anger (Beam Angle) refers to the effective lighting angle of bulb in the space, and general " osram lamp " or so-called " Electricity-saving lamp bulb ", its light emitting anger all can reach more than 300 degree.Yet existing market finding LED bulb, its light emitting anger are all spent about light emitting angers 120, the rare 180 degree light emitting angers that surpass.The less reason of known LED emitting bulb light emitting anger, one are the luminous half space light emitting anger that belongs to of LED, and its similar lambert (Lambertian) light source, its light emitting anger only have 120 degree (calculate with its half-value angle, details are as follows).Not as " osram lamp " or " Electricity-saving lamp bulb " has total space light emitting anger.General desirable Lambertian light source, its brightness I _VWith and the normal of LED luminous flat between folded lighting angle θ increase and reduce (I wherein ₀For lighting angle θ is 0 maximum brightness when spending), its relational expression is:

I _V(θ)＝I _OCosθ (1)

Its schematic diagram is shown in Fig. 1.Define its available light emitting anger θ _FBe angular brightness θ _H(when this angle, its brightness I _V(θ _H) brightness is I ₀Half) twice, can find out θ by formula (1) _F=2x θ _H=2x60=120 degree.

As shown in Figure 2, another is former because the appearance structure of LED bulb limits its light emitting anger in 180 degree.Because general LED bulb in order to dispel the heat, must be covered with radiating fin 22 as heat transmission on 21 to LED 20 on its bulb power input head.The material of these radiating fins 22 is mostly take the good metal material that dispels the heat as main, such as aluminium, copper etc. or its alloy, still good aluminium nitride or aluminium oxide ceramics of the heat conduction of utilizing arranged also in addition.But these materials are all light tight material, so the LED bulb only can utilize light-transmitting materials to export as light in leading section 23, and the light that causes light source led 20 to produce only has light output in 180 degree of the place ahead.

Although a present known technology utilizes the secondary optics structure in the LED emitting bulb, and can produce 300 the degree light emitting angers the LED bulb, its complex structure, light extraction efficiency is low, the uniformity is not good.Its schematic construction as shown in Figure 3.

As shown in Figure 3, LED 31 is distributed on the whole corresponding circumference, and the material of secondary optics structure 30 is the white reflection body, and ground floor reflecting plate 32 and second layer reflecting plate 33 are arranged in the known LED emitting bulb.As shown in Figure 3, the light that LED 31 sends, part is reflected into lamp holder direction light 34 through ground floor reflecting plate 32, another part light is reflected into side surface direction light 35 through second layer reflecting plate 33, other has most of light is frontal light 36 via the alternate manner direct projection, forms by this LED bulb with 300 degree beam angles.But its complex structure, light extraction efficiency is low, and the uniformity is not good.

Two. non-uniform light:

Because the LED emitting bulb, its power demand is about about 5W～10W, and the light that just can reach 500～1000lm is well-illuminated, and the power of single-chip LED and Heat Conduction Problems are difficult to reach above-mentioned requirements.Therefore, the LED emitting bulb all reaches the demand with a plurality of chips usually.Therefore yet the brightness of these chips and colourity mutual difference cause the irregular phenomenons such as hot spot on the LED emitting bulb or yellow circle, and unlike " osram lamp " or " Electricity-saving lamp bulb ", its surface light emitting is very even.

Three. light extraction efficiency is not good:

Present led chip, though its luminous efficiency has reached 150lm/W, more can reach 250lm/W future, but present bulb whole lighting efficiency only has 50%～60% chip efficient approximately, that is to say and only has 75lm/W～90lm/W.Overall lamp bubbles out the low reason of optical efficiency, mainly contains three factors: (1) electronic circuit efficient (reached 80% at present, can reach 90% future); (2) temperature factor (successively decrease because chip light emitting efficient increases with temperature, 10 ℃ of general every increases, its luminous efficiency falls 2% approximately); (3) bulb structure light emission rate low (generally being about below 80%).

Four. radiating effect is not good:

Known LED emitting bulb, its structure as shown in Figure 2, wherein the area of radiating fin 22 radiating areas parts and the summation of leading section 23 output optical zone part areas are fixed value.If radiating area increases, then the output optical zone area reduces, on the contrary the radiating area minimizing, and output optical zone could increase, so it accepts or rejects all difficulties.Generally mostly selecting approximately each 50% is main.Therefore output optical zone has limited radiating area, and the result is that radiating effect is not good, causes light emission rate to reduce LED 20 losts of life.Other has a problem, as shown in Figure 4, because the lampshade 41 of the employed light fixture of the known LED emitting bulb of device has limited the cross-ventilation of its radiating area 42, thereby has caused the heat radiation extreme difference.As shown in Figure 4, glass lamp shade 41 causes hot-air to concentrate on radiating area 42 parts of known LED emitting bulb and can't dispel the heat.Although and luminous zone 43 cross-ventilations of known LED emitting bulb are better, can do nothing to help also heat radiation, thereby cause the led chip temperature very high.

Five. weight is too heavy:

Known LED emitting bulb as shown in Figure 2, owing to radiating fin 22 must be set to help heat radiation, causes its weight about about 150g, only has approximately compared to general " osram lamp " that obviously weight is too heavy about 50g.

Six. outward appearance is not good:

Generally " osram lamp " or " Electricity-saving lamp bulb ", its luminous zone be one complete spherical, aesthetic in appearance, smooth and easy.Yet known LED emitting bulb as shown in Figure 2 still has most radiating area outside its luminous zone, peculiarly shaped, is difficult for being accepted by general domestic lighting.

Seven. the heat dissipation metal district easily causes Danger Electric shock risk:

Known LED emitting bulb is just gradually adopting HVDC LED or AC LED as power supply, but its input power is directly inputted after all utilizing AC rectification.If its fin is metal material, then easily get an electric shock because of the earth terminal anti-plug.Therefore must utilize isolating transformer to prevent, but also increase power loss and cost increase.

Eight. too expensive:

The led chip price has dropped to 300～400lm/USD at present, and namely the lumen number of each piece U.S. dollar has reached 300～400lm, and can reach 1000lm/USD future.Although the bulb chip of present 1 1000 lumen only needs 2.5～3.3 U.S. dollars, but because whole efficiency only has 50%～60% light extraction efficiency, therefore the actual cost of led chip that uses is still wanted 5～7 dollars, add radiating fin and electronic circuit, each cost still reaches more than 10 dollars, therefore can't generally use.

Summary of the invention

Technical problem and purpose that institute of the present invention wish solves:

Comprehensive the above, the present invention proposes a brand-new emitting bulb structure, have luminous evenly and the advantage such as heat radiation is good.

The technological means that the present invention deals with problems:

The present invention is for solving the problem of known technology, and the technological means that adopts provides a kind of emitting bulb, comprises light source and cover body.Light source is in order to send light.Cover body defines the inner space, and light source is to be arranged in the cover body and with described cover body heat conduction to be connected.The light that cover body is made by Heat Conduction Material and but reflection source sends is to the inner space.Wherein, form a plurality of perforation on the cover body, so that be arranged at the certainly perforation ejaculation of light that the light source in the cover body sends.

Specific embodiment of the present invention will be by following embodiment and graphic being further described.

Description of drawings

Fig. 1 is desirable Lambertian light source schematic diagram;

Fig. 2 is a known LED bulb schematic diagram;

Fig. 3 is another the known LED bulb schematic diagram with secondary optics structure;

Fig. 4 is a known LED bulb assembling schematic diagram;

Fig. 5 is emitting bulb the first preferred embodiment schematic diagram of the present invention;

Fig. 6 is the light path schematic diagram of emitting bulb the first preferred embodiment of the present invention;

Fig. 7 is the light path schematic diagram of a known LED bulb;

Fig. 8 is the percent opening schematic diagram of emitting bulb cover body of the present invention;

Fig. 9 is emitting bulb the second preferred embodiment schematic diagram of the present invention;

Figure 10 is emitting bulb the 3rd preferred embodiment schematic diagram of the present invention;

Figure 11 is emitting bulb the 4th preferred embodiment schematic diagram of the present invention;

Figure 12 is emitting bulb the 5th preferred embodiment schematic diagram of the present invention;

Figure 13 is the light path schematic diagram of a plurality of LED of known LED bulb; And

Figure 14 is the schematic diagram of a plurality of LED of the 6th preferred embodiment tool of emitting bulb of the present invention; And

Figure 15 is the schematic diagram of the 7th preferred embodiment employing multicolor LED of emitting bulb of the present invention.

[primary clustering symbol description]

20 LED

21 power input heads

22 radiating fins

23 leading sections

30 secondary optics structures

31 LED

32 ground floor reflecting plates

33 second layer reflecting plates

34 lamp holder direction light

35 side surface direction light

36 frontal light

41 lampshades

42 radiating areas

43 luminous zones

50 power input heads

51 LED

52 circuit boards

53 housings

54 cover bodies

55 perforation

56 reflecting coatings

57 electrically-insulating paints

61 LED

62 cover bodies

71 LED

72 cover bodies

81 LED

82 cover bodies

83 perforation

90 LED

91 photic zones

92 cover bodies

93 perforation

101 LED

102 light

103 cover bodies

104 perforation

111 LED

112 cover bodies

113 perforation

121 LED

122 cover bodies

123 perforation

131 cover bodies

141 cover bodies

LED1 LED

LED2 LED

The R red-light LED

The G green light LED

The B blue-ray LED

The W white light LEDs

The specific embodiment

In this specification a mentioned number above or below, be to comprise number itself.And will be appreciated that this specification discloses some method, the flow process of carrying out the function that discloses, have the multiple structure relevant with the announcement structure of carrying out identical function, and above-mentioned structure can be reached identical result usually.

One embodiment of the invention, its structure as shown in Figure 5, wherein emitting bulb of the present invention comprises bulb power input termination 50, light source, circuit board 52, housing 53 and links with housing 53 and the cover body 54 of the device that can be combined as a whole.

Light source is in order to sending light, and comprises at least one light emitting diode (LED) 51, Organic Light Emitting Diode (OLED) or other is such as illuminating sources such as laser.Cover body 54 defines the inner space, and light source is to be arranged in the cover body 54 and with cover body 54 heat conduction to be connected.The light that cover body 54 is made by Heat Conduction Material and but reflection source sends is to the inner space.Wherein, form a plurality of perforation 55 on the cover body 54,55 penetrate from boring a hole so that be arranged at light that the light sources in the described cover body 54 send.

Light source such as LED 51 grades is to be installed on the circuit board 52, as long as the heat conduction that tool is good between circuit board 52 and the cover body 54 is connected (contain directly and indirect), circuit board 52 no matter is arranged at cover body 54 inboards or all can and dispel the heat via air through cover body 54 in cover body 54 outsides.

Specifically, if circuit board 52 places cover body 54 inboards, the heat that the LED 51 of light source and circuit board 52 produce is directly to dispel the heat via air through cover body 54.If circuit board 52 places cover body 54 outsides (shown in the embodiment of Fig. 5), on the one hand, the heat that the LED 51 of light source and circuit board 52 produce can directly see through cover body 54 and dispel the heat via air, on the other hand, because being installed in the housing 53 and with housing 53 heat conduction, circuit board 52 is connected, and housing 53 is connected with cover body 54 heat conduction, the heat that the LED 51 of light source produces can also arrive housing 53 via the aluminium base heat conduction that circuit board 52 comprises, conduct to again emitting bulb cover body 54, finally by being dispelled the heat by air.

In certain embodiments, if be connected without direct heat conduction between circuit board 52 and the cover body 54, housing 53 is arrived in the aluminium base heat conduction that the heat that the LED 51 of light source and circuit board 52 produce also can only comprise via circuit board 52, conducts to emitting bulb cover body 54, finally by being dispelled the heat by air again.

In addition, describedly is connected with the housing 53 of emitting bulb in order to the power input head 50 that power supply input is provided, and in order to provide light source required light driving, the also usefulness of the whole bulb of conduct support.

Cover body 54 defines an inner space, is to be arranged in the cover body 54 such as the light source of LED 51.Emitting bulb cover body 54 can reflect the light that LED 51 sends.In present embodiment, cover body 54 is essentially spherical shell shape.Bulb cover body 54 is made and to be preferably the good metal of thermal conductivity be main by Heat Conduction Material, such as aluminium, copper etc. or its alloy.Spherical shell shape cover body 54 is also as the light-emitting area of emitting bulb, so is furnished with very numerous a plurality of perforation 55 on it, 55 penetrates from boring a hole so that be arranged at light that the light sources in the cover body 54 send.The better white reflection coating 56 that is coated with in the inboard of the spherical shell shape cover body 54 of emitting bulb is to reflect (or title diffusion) light that described light source was sent to the inner space.White reflection coating 56 must be selected the coating that reflectivity is good and whiteness is high.White reflection coating 56 commonly used comprises the better barium sulfate of reflection characteristic (Ba2SO4), polytetrafluoroethylene (PTFE) (Teflon) or titanium dioxide (TiO2) at present, and its reflectivity can reach 98%, and whiteness also can reach 99%.Reflecting coating 56 is a kind of diffusive reflectorized materials, so after light was transmitted into spherical shell shape cover body 54 inwalls by LED 51, behind white reflection coating 56, almost all diffusions were got back in the inner space of cover body 54, and its optical absorption loss is very little.

In order to increase the attractive in appearance of emitting bulb cover body 54 and to prevent from getting an electric shock, the outside of emitting bulb spherical shell shape cover body 54 also is coated with white electrically-insulating paint 57.Therefore, can make whole emitting bulb cover body 54 as known Electricity-saving lamp bulb present homogeneous powder white, and because the electric insulating quality of electrically-insulating paint 57 has also prevented the danger of getting an electric shock.

Structure of the present invention, adopting the principle of optical integrating-sphere (Integrating Sphere) is starting point.Most important person utilizes the spherical architectural characteristic in the principle of optical integrating-sphere, by light at spherical shell shape cover body 54 inboard Multi reflections, by this with the complete homogenising of light.In other words, if spot light places any point on the sphere, then the luminous flux on arbitrary unit are (light flux) is all identical on the sphere.In other words, to whole sphere, so its unit are luminous flux is almost identical by mean allocation for the luminous flux of described spot light.If the light diffusion angle of each point is also identical, then the brightness of each point (luminous flux in the per unit solid angle) is also identical.Because cover body 54 inboards are coated with white reflection coating 56, its level of diffusion is very good, therefore can meet above-mentioned condition, and namely the brightness of the inboard each point of lamp housing will be very even.Above-described theory can utilize Fig. 6 to illustrate.

As shown in Figure 6, radius is the integrating sphere of R0, and light source led 61 places any point position on the sphere of spherical shell shape cover body 62, and then on the described some position of spherical shell shape cover body 62, the luminous flux of the suffered LED 61 of its dA area can be derived by following mathematical expression.

Suppose that LED is the Lambertiam spot light, so its brightness is the function of angle θ, its large I is assumed to be I (θ)=I _OCos θ, then shone the locational luminous flux dL=I of described point (θ) the d Ω of spherical shell shape cover body 62 by described spot light LED 61, the wherein solid angle of d Ω for being opened to the dA area of described some position of spherical shell shape cover body 62 by LED 61, and R is that luminous point 61 is to a distance of putting the 62dA area.Wherein:

$\mathrm{d\Ω}=\frac{\mathrm{dACos\θ}}{R^2}$

∵R＝2R ₀Cos(θ) $\stackrel{\&CenterDot;}{\&CenterDot;\&CenterDot;}\mathrm{d\&Omega;}=\frac{\mathrm{dACos\&theta;}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2{\mathrm{Cos}}^2\mathrm{\&theta;}}$

With above-mentioned formula substitution dL=I (θ) d Ω, can derive:

$\mathrm{dL}=I\left(\mathrm{\&theta;}\right)\mathrm{d\&Omega;}=I_O\mathrm{Cos\&theta;}\&CenterDot;\frac{\mathrm{dACos\&theta;}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2{\mathrm{Cos}}^2\mathrm{\&theta;}}=\frac{I_O}{4R_O^2}\mathrm{dA}....\left(2\right)$

Therefore can draw: $\frac{\mathrm{dL}}{\mathrm{dA}}=\frac{I_O}{4R_O^2}....\left(3\right)$

See through algorithm development, can learn that the luminous flux on any unit are on the sphere is all identical.Therefore, if described small size dA is fine perforation, no matter the position of described fine perforation then, its light output light flux is all identical.

But in the known LED emitting bulb structure, as shown in Figure 7, LED 71 is the central point Ro that place the hemisphere of emitting bulb cover body 72.If any point area dA on the consideration sphere, its luminous flux is:

$\mathrm{dL}=I\left(\mathrm{\&theta;}\right)\mathrm{d\&Omega;}=I_O\mathrm{Cos\&theta;}\&CenterDot;\frac{\mathrm{dA}}{{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}=\frac{I_O\mathrm{dA}}{R_O^2}\mathrm{Cos\&theta;}$

Therefore can draw:

$\frac{\mathrm{dL}}{\mathrm{dA}}=\left(\frac{I_O}{{R_O}^2}\right)\mathrm{Cos\&theta;}.....\left(4\right)$

Can be found out the luminous flux of unit are on the described sphere by formula (4) To change with angle θ, and its pass is Cos θ relation.When θ=60, the luminous flux of unit are on the described sphere

Be kept to 50%, claimed that generally this angle is half-value angle θ _HDescribed half-value angle θ _HTwice, be commonly referred to light emitting anger θ _F=2 θ _HHence one can see that, and its light emitting anger is 120 degree.Yet the light emitting anger of emitting bulb of the present invention can be found out by formula (3), and is irrelevant with angle θ, so its light emitting anger is comprehensive, can say that also light emitting anger is 360 degree.Relatively (3) formula can find out that with (4) formula emitting bulb of the present invention is complete uniformly light-emitting, and known LED emitting bulb is inhomogeneous luminous.

As shown in Figure 6, if described some dA is not perforation, but the shell wall of cover body, then described luminous flux dL will produce because of the white reflecting material on the shell wall diffuse reflection (Scattering).Because the reflecting material that applies on the shell wall is white reflection coating, white reflecting materials such as barium sulfate (Ba2SO4), polytetrafluoroethylene (PTFE) (Teflon) or titanium dioxide (TiO2), because of these white reflector, reflectivity (reflection) r at visible-range is very high, and its spectral reflectivity (Spectra-reflectivity) R (λ) is very smooth, so its reverberation is almost kept original colourity.That is to say that its whiteness is very high, general whiteness can reach 99%, and its reflectivity r also can reach about 98%.The height of reflectivity r can affect the light extraction efficiency of bulb.If reflectivity r is ideal 100%, then the optical efficiency of bulb also can reach 100%, if but reflectivity r＜100%, then the light emission rate of bulb will descend, and its relation will illustrate with Fig. 8.

As shown in Figure 8, suppose that LED 81 is the Lambertian spot light, its luminous flux that sends is Li.Be furnished with a plurality of trickle perforation 83 on the cover body 82.The diameter of supposing trickle perforation 83 is d, and the spacing of its distribution density (pitch) is P, then the percent opening of the whole perforation 83 of definition:

$a\&cong;\frac{({\mathrm{\&pi;d}}^2/4)}{P^2}$

Suppose that the perforation 83 that forms on the cover body of emitting bulb is evenly distribution, after all perforation 83 of luminous flux Li process that then LED 81 light sources send, the luminous flux L that it sees through for the first time ₁=a*Li, and remaining luminous flux Lr for the first time ₁=Li-aLi=(1-a) Li.Remain for the first time luminous flux Lr ₁Reflect back into again the inner space of cover body 82 via cover body 82.The reflectivity of supposing cover body 82 is r, and then its first reflection luminous flux is r (1-a) Li.These reflection flux to the ball wall, are producing the luminous flux L that for the second time see through through all thin perforation 83 with average reflection ₂=a*r (1-a) Li.In like manner, remaining luminous flux Lr for the second time ₂=r (1-a) Li-ar (1-a) Li=r (1-a) ²Li.Remain for the second time luminous flux Lr ₂Be reflected back the inner space of cover body 82 through shell wall, interreflection passes again, and by that analogy, can get total amount of light L and is:

$L=L_1+L_2+L_3+...$

$=\mathrm{aLi}+\mathrm{ar}(1-a)\mathrm{Li}+{\mathrm{ar}}^2{(1-a)}^2\mathrm{Li}+...$

$=\mathrm{aLi}(1+r(1-a)+r^2{(1-a)}^2\mathrm{Li}...)$

$=\frac{\mathrm{aLi}}{1-r(1-a)}$

Define optical efficiency:

$\mathrm{\&eta;}=\frac{L}{\mathrm{Li}}=\frac{a}{1-r(1-a)}....\left(5\right)$

Can be drawn by formula (5), the height if reflectivity r is healed then light extraction efficiency η are also larger.For example, suppose the emitting bulb cover body 82 83 diameter d=0.8mm that are designed to bore a hole, its distribute spacing P=1mm, then its percent opening:

$a=\frac{\mathrm{\&pi;}\&CenterDot;{0.8}^2}{{4.1}^2}=0.5$

If the coating white reflecting coating reflectivity r=0.98 of institute is then by formula (5), its light extraction efficiency

$\mathrm{\&eta;}\&cong;\frac{0.5}{1-0.98(1-0.5)}=0.98$

The effective light emission rate that is to say this emitting bulb is 98%.The light emission rate efficient that can find out thus LED bulb of the present invention is very high.If but percent opening a=0.3, then its light emission rate η=95.5%.Percent opening a is less, its whole light mixing effect better, but light extraction efficiency can descend a little, so percent opening a must do suitable selection.

In the emitting bulb of the present invention, described Integral ball shelly cover body is all made take the height Heat Conduction Material as main body, such as aluminium, copper etc., or its alloy can also another kind of height Heat Conduction Materials such as the ceramic materials such as aluminium nitride or aluminium oxide are made or its composite is made.The cover body of these emitting bulbs can utilize one-body molded or separately impact style formation.If the formation of perforation is the metal cover body, can utilizes impact style or utilize the die casting mode to form.If be ceramic material, can utilize the mould sintering to form.

The efficient that LED is luminous and life-span, depend primarily on the height of chip junction temperature (junction Temperature) Tj.Generally speaking, the Tj temperature is lower, and its luminous efficiency is higher, and the life-span is also longer.The height of junction temperature depends on LED crystal grain to the heat conduction of circuit board, and circuit board is to the heat conduction of housing, at last by housing through mechanism such as air heat radiations.Because the packing heat conduction technology of high-capacity LED crystal grain is improved greatly, its crystal grain all can be controlled in 10 ℃ to the temperature rise of circuit board at present.And circuit board has utilized aluminium base to be material at present all, and its thermal conductivity is also very high, so it asks that temperature rise is also very little.Therefore in the whole hot biography process, the main source of temperature rise or bottleneck mainly are that housing is to the cooling mechanism of air.

To room lighting LED emitting bulb, cover body is mainly cross-ventilation and two mechanism of radiation to the cooling mechanism of air.And cross-ventilated cooling mechanism, its relational expression is:

P _a＝h _aAΔT...(6)

In the formula (6), Pa is cover body and cross-ventilated thermal power, h _aFor heat loss through convection is several, A is the effective area of cover body, and Δ T is cover body and the outside air temperature difference.General heat loss through convection is several h _aBe the factor of cover body planform and the factor of air velocity.Cover body effective area A is relevant with planform.Known LED emitting bulb in order to increase significant surface A, mostly utilizes the structure of fin, but in the structure of fin, after the degree of depth strengthened, its effect was also decrescence few.And the LED emitting bulb only has free convection in the most harsh situation, so the fin effect is very little.In addition, heat loss through radiation mechanism, its relational expression is:

$P_r=\mathrm{\&epsiv;\&sigma;A}(T^4-T_a^4)\&cong;4\mathrm{\&epsiv;\&sigma;}{\mathrm{AT}}_a^3\mathrm{\&Delta;T}...\left(7\right)$

In the formula (7), Pr is the cover body radiant power, and ε is the radiance (Emissivity) of cover body material, and σ is Stefan-Boltzman constant=5.6 * 10-8w/m ²k ⁴Wherein, Ta is air themperature, and when Ta was assumed to be 300k, (7) formula can be rewritten as:

Pr=ε hrA Δ T... (8) (wherein $\mathrm{hr}\&cong;6.0w/m^{2}k$ )...(8)

By finding out in the formula (8), cover body radiance ε can affect the radiating efficiency of radiation.Generally speaking, full black matrix (Black-Body) radiance is 1.0, and the beam radiance that is all-trans is 0.Usually the radiance of pure aluminum metal is about below 0.1, so cover body need be coated with some coating, for example: barium sulfate coating, then its radiance can be increased to about 0.9, and therefore described heat loss through radiation effect is splendid.

And under complete windless condition, can suppose the cross-ventilation coefficient

Utilize formula (6) and (8), can estimate the temperature rise of LED emitting bulb.The LED bulb of a 10W for example, if its spherical shell diameter is 10cm, then circuit board to cover body temperature rise is Δ T, then by:

If the led chip junction is 10 ℃ to the circuit board temperature rise, and as above circuit board to cover body temperature rise is 29 ℃, and then led chip junction temperature T is j=25 ℃+29 ℃+10 ℃=64 ℃.The junction temperature of general LED, below 85 ℃, its luminous efficiency and life-span all can be kept quite high level.

But known LED emitting bulb, half is as radiating fin in the area of its spherical shell shape cover body, and second half is as light area, and then its effective area A only has half.Although the radiating fin of known LED emitting bulb has the area of increasing effect, fully calm, during natural convection air, the effect of Suo Shu Zhu sheet is very little, and on the contrary so that the radiation mechanism reduction.Therefore, when same power, its temperature rise may reach about 60 ℃, and then j=25 ℃+60 ℃+10 ℃ of its junction temperature T will reach 95 ℃, and its luminance and life-span will descend a lot.

In the present invention, for example shown in Fig. 5 and 8, owing to utilize the whole cover body 54 of emitting bulb, 82 as heat conduction and heat radiation, so must be good thermal conductor in the emitting bulb cover body 54,82.But good thermal conductor generally is all light tight body, therefore must numerous perforation 55,83 be set at whole cover body 54,82 and use as bright dipping.Because these perforation 55,83 may cause dust or foreign material etc. to enter in the lamp housing; cause LED 51,81 or shell in the white reflection coating 56 that is coated with rotten; therefore can one photic zone be arranged in the cover body 54 of whole emitting bulb, 82 outer side covers, as protective effect.Photic zone can be plastic foil or other transparent silica gel material.Its implementation method can utilize film to stick or the method such as sputter layer of transparent film.Its schematic diagram, as shown in Figure 9.

As shown in Figure 9, photic zone 91 is covered in the outside of cover body 92, and the light that sends for the LED 90 of light source passes photic zone 91 via perforation 93 and penetrates.Photic zone 91 must be close to the outer wall that covers cover body 92, reducing the intermediate air layer, and avoids the capacity of heat transmission to reduce.Certainly photic zone 91 can be complete transparent form (clear type) or vaporific (diffuse type) form.If be vaporific form, must select the enough good material of its light transmittance to use.

Emitting bulb of the present invention still can utilize the distribution density of control punch, obtains different " distribution curve flux " (Beam-Angle Distribution).Figure 10 is another embodiment of the present invention, and the perforation 104 that its all bright dippings are used only has layout in the α angle, does not then arrange in other angle.Therefore, all luminous flux L of the LED 101 of emitting bulb of the present invention will export in the solid angle of mean allocation in the α angle.Because, spherical shell shape cover body 103 inboards are coated with the white reflection coating of high reflectance, so the light 102 that LED 101 sends will directly be got on the high reflectance white reflection coating of spherical shell shape cover body 103 inboards that are not equipped with perforation 104, and be diffused in the inner space of getting back to spherical shell shape cover body 103, last on average by perforation 104 outputs that are distributed in the α angle.This α angle is changeable, if the optic angle of the distribution curve flux of little this emitting bulb of expression of α angle is also little, and it is more concentrated to represent this emitting bulb light.Therefore, the illumination (illuminance) at place, the dead ahead under same distance is also larger.This emitting bulb can use at some only needs the operating position of throwing light among a small circle.

Another embodiment of the present invention, as shown in Figure 11, the perforation 113 that forms on the cover body 112 of emitting bulb is non-uniform Distribution, and utilizes the distribution density that changes perforation 113, " distribution curve flux " of the light that the LED 111 of change emitting bulb sends.Perforation 113 distribution density is the closeest at position A, B two places, thus this emitting bulb at the luminous flux of A, B position with maximum.

The above, the bulb cover body among the present invention all take spherical shell shape as explanation, but in actual applications, also can be made and be essentially oval ball or other three-dimensional shape.According to above-mentioned Theory of integrating sphere, if cover body is orbicule, then to a Lambertian spot light, the light flux distribution at its arbitrary place on sphere is all identical.If but be not spherical shell shape, then its light flux distribution is with variant.As shown in Figure 12, its cover body 122 is essentially an oval spherical shell shape, perforation 123 density is as be evenly on cover body 122, behind the light arrival A point and B point that then light source led 121 sends, and the unit are luminous flux that the unit are luminous flux that A is ordered will be ordered greater than B.Therefore, if obtain uniform unit are luminous flux, then can utilize the density adjustment of bright dipping perforation 123, obtain uniform unit are luminous flux.With the embodiment shown in Figure 12, must be greater than perforation 123 Density Distribution at A point place in perforation 123 density at B point place.Therefore, utilize the adjustment of perforation 123 density, cooperate the distribution of luminous flux on oval spherical shell shape cover body 122, can obtain uniform luminous flux output.

As previously mentioned, one of problem of known luminescence bulb is its non-uniform light at present, and its non-uniform light comprises brightness irregularities and colourity is inhomogeneous.And the present invention can overcome this problem, to reach uniform brightness and colourity, illustrates that hereby its principle is as follows.Figure 13 represents the structure of present known LED emitting bulb.Wherein, LED1 and LED2 are two different LEDs chips, and it places on cover body half bulb diameter on the diverse location.The LED1 of known LED emitting bulb and LED2 can see through following tristimulus values computing in synthetic brightness and the colourity of the position of emitting bulb cover body 131 A and position B.

Three values supposing the luminous flux that LED1 is luminous are X ₁, Y ₁, Z ₁, and three values of the luminous luminous flux of LED2 are X ₂, Y ₂, Z ₂, and suppose that each LED1 and LED2 are the Lambertian spot light, then three values of the luminous flux of LED1 on small size ds on the A of the position of emitting bulb cover body are dX _1A, dY _1A, dZ _1A, wherein:

${\mathrm{dX}}_{1A}=X_1\frac{\mathrm{ds}}{R_{1A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1A}$

${\mathrm{dY}}_{1A}=Y_1\frac{\mathrm{ds}}{R_{1A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1A}$

${\mathrm{dZ}}_{1A}=Z_1\frac{\mathrm{ds}}{R_{1A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1A}$

In like manner three values of the luminous flux of LED1 on small size ds on the bulb position B are dX ₁B, dY ₁B, dZ ₁B, wherein:

${\mathrm{dX}}_{1B}=X_1\frac{\mathrm{ds}}{R_{1B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1B}$

${\mathrm{dY}}_{1B}=Y_1\frac{\mathrm{ds}}{R_{1B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1B}$

${\mathrm{dZ}}_{1B}=Z_1\frac{\mathrm{ds}}{R_{1B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1B}$

In like manner, three values of the luminous flux of LED2 on small size ds on the bulb position A are dX ₂A, dY ₂A, dZ ₂A, wherein:

${\mathrm{dX}}_{2A}=X_2\frac{\mathrm{ds}}{R_{2A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2A}$

${\mathrm{dY}}_{2A}=Y_2\frac{\mathrm{ds}}{R_{2A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2A}$

${\mathrm{dZ}}_{2A}=Z_2\frac{\mathrm{ds}}{R_{2A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2A}$

In like manner, three values of the luminous flux of LED2 on small size ds on the bulb position B are dX ₂B, dY ₂B, dZ ₂B, wherein:

${\mathrm{dX}}_{2B}=X_2\frac{\mathrm{ds}}{R_{2B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2B}$

${\mathrm{dY}}_{2B}=Y_2\frac{\mathrm{ds}}{R_{2B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2B}$

${\mathrm{dZ}}_{2B}=Z_2\frac{\mathrm{ds}}{R_{2B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2B}$

Therefore, the tristimulus values of LED1 and the LED2 synthetic luminous flux on the A small size ds of position is:

$\left.\begin{array}{c}{\mathrm{dX}}_A={\mathrm{dX}}_{1A}+{\mathrm{dX}}_{2A}=X_1\frac{\mathrm{ds}}{R_{1A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1A}+X_2\frac{\mathrm{ds}}{R_{2A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2A}\\ {\mathrm{dY}}_A={\mathrm{dY}}_{1A}+{\mathrm{dY}}_{2A}=Y_1\frac{\mathrm{ds}}{R_{1A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1A}+Y_2\frac{\mathrm{ds}}{R_{2A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2A}\\ {\mathrm{dZ}}_A={\mathrm{dZ}}_{1A}+{\mathrm{dZ}}_{2A}=Z_1\frac{\mathrm{ds}}{R_{1A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1A}+Z_2\frac{\mathrm{ds}}{R_{2A}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2A}\end{array}\right\}---\left(9\right)$

In like manner, the tristimulus values of LED1 and the LED2 synthetic luminous flux on the B small size ds of position is:

$\left.\begin{array}{c}{\mathrm{dX}}_B={\mathrm{dX}}_{1B}+{\mathrm{dX}}_{2B}=X_1\frac{\mathrm{ds}}{R_{1B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1B}+X_2\frac{\mathrm{ds}}{R_{2B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2B}\\ {\mathrm{dY}}_B={\mathrm{dY}}_{1B}+{\mathrm{dY}}_{2B}=Y_1\frac{\mathrm{ds}}{R_{1B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1B}+Y_2\frac{\mathrm{ds}}{R_{2B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2B}\\ {\mathrm{dZ}}_B={\mathrm{dZ}}_{1B}+{\mathrm{dZ}}_{2B}=Z_1\frac{\mathrm{ds}}{R_{1B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{1B}+Z_2\frac{\mathrm{ds}}{R_{2B}^2}\mathrm{Cos}{\mathrm{\&theta;}}_{2B}\end{array}\right\}---\left(10\right)$

Utilize the colourity definition of CIE1939 defined, in the chromaticity coordinate (x, y) of position A and position B respectively be:

$x_A=\frac{{\mathrm{dX}}_A}{{\mathrm{dX}}_A+{\mathrm{dY}}_A+{\mathrm{dZ}}_A},$ $y_A=\frac{{\mathrm{dY}}_A}{{\mathrm{dX}}_A+{\mathrm{dY}}_A+{\mathrm{dZ}}_A}$

$x_B=\frac{{\mathrm{dX}}_B}{{\mathrm{dX}}_B+{\mathrm{dY}}_B+{\mathrm{dZ}}_B},$ $y_B=\frac{{\mathrm{dY}}_B}{{\mathrm{dX}}_B+{\mathrm{dY}}_B+{\mathrm{dZ}}_B}$

Because

The variation of four parameters causes x _A≠ x _B, and y _A≠ y _BUnless X ₁=kX ₂, Y ₁=kY ₂, Z ₁=kZ ₂(k is ratio) then can obtain x _A=x _B, y _A=y _BNamely when LED1 and the colourity of LED2 own are the same, then it is in the mixing colourity of diverse location too.But still can find out dY by formula (9) and formula (10) _AAnd dY _BStill do not wait, that is to say to obtain uniform luminance.Yet different LED is difficult to be controlled at same colourity, only can utilize classification to obtain, and the price of the led chip through classifying will be very expensive.Yet utilize emitting bulb of the present invention, can solve top problem, hereby be described as follows.

As shown in figure 14, the light source of emitting bulb of the present invention comprises a plurality of LED1 and LED2.The radius of supposing the spherical shell shape cover body 141 of emitting bulb is R ₀, LED1 and LED2 place the diverse location of spherical shell shape cover body 141.The tristimulus values of supposing the luminous flux that LED1 is luminous is X ₁, Y ₁, Z ₁, LED2 the tristimulus values of luminous flux of light be X ₂, Y ₂, Z ₂, and suppose that LED1 and LED2 are the Lambertian light source, then can be derived by the principle in the front formula (2) and learn the tristimulus values dX of the luminous flux of LED1 on small size ds on the bulb position A _1A, dY _1A, dZ _1AFor:

${\mathrm{dX}}_{1A}=X_1\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

${\mathrm{dY}}_{1A}=Y_1\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

${\mathrm{dZ}}_{1A}=Z_1\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

In like manner, the tristimulus values dX of the luminous flux of LED1 on small size ds on the bulb position B _1B, dY _1B, dZ _1BFor:

${\mathrm{dX}}_{1B}=X_1\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

${\mathrm{dY}}_{1B}=Y_1\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

${\mathrm{dZ}}_{1B}=Z_1\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

In like manner, the tristimulus values dX of the luminous flux of LED2 on small size ds on the A of position _2A, dY _2A, dZ _2AFor:

${\mathrm{dX}}_{2A}=X_2\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

${\mathrm{dY}}_{2A}=Y_2\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

${\mathrm{dZ}}_{2A}=Z_2\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

The tristimulus values dX of the luminous flux of LED2 on small size ds on the B of position _2B, dY _2B, dZ _2BFor:

${\mathrm{dX}}_{2B}=X_2\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

${\mathrm{dY}}_{2B}=Y_2\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

${\mathrm{dZ}}_{2B}=Z_2\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}$

Therefore, LED1 and LED2 are at the tristimulus values dX of the synthetic luminous flux of position A _A, dY _A, dZ _AFor:

$\left.\begin{array}{c}{\mathrm{dX}}_A={\mathrm{dX}}_{1A}+{\mathrm{dX}}_{2A}=(X_1+X_2)\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}\\ {\mathrm{dY}}_A={\mathrm{dY}}_{1A}+{\mathrm{dY}}_{2A}=(Y_1+Y_2)\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}\\ {\mathrm{dZ}}_A={\mathrm{dZ}}_{1A}+{\mathrm{dZ}}_{2A}=(Z_1+Z_2)\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}\end{array}\right\}---\left(11\right)$

In like manner LED1 and LED2 are at the tristimulus values dX of the synthetic luminous flux of position B _B, dY _B, dZ _BFor:

$\left.\begin{array}{c}{\mathrm{dX}}_B={\mathrm{dX}}_{1B}+{\mathrm{dX}}_{2B}=(X_1+X_2)\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}\\ {\mathrm{dY}}_B={\mathrm{dY}}_{1B}+{\mathrm{dY}}_{2B}=(Y_1+Y_2)\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}\\ {\mathrm{dZ}}_B={\mathrm{dZ}}_{1B}+{\mathrm{dZ}}_{2B}=(Z_1+Z_2)\frac{\mathrm{ds}}{4{\mathrm{<figure-callout\; id="0"\; label="R"\; filenames="HSA00000618853500011.png"\; state="\{\{state\}\}">R</figure-callout>}}_0^2}\end{array}\right\}---\left(12\right)$

Therefore, can find out dX by formula (11) and formula (12) _A=dX _B, dY _A=dY _B, and dZ _A=dZ _BTherefore brightness and the colourity of ordering at A point and B are all identical.Because the above A point of considering and B point are the arbitrfary point, any point that therefore can obtain on the whole spherical shell all has identical brightness and colourity.

Utilize the principle of chromaticity coordinate, the chromaticity coordinates (x, y) that can be obtained any point on the spherical shell by formula (11) is:

$\left.\begin{array}{c}x=\frac{{\mathrm{dX}}_A}{{\mathrm{dX}}_A+{\mathrm{dY}}_A+{\mathrm{dZ}}_A}=\frac{(X_1+X_2)}{(X_1+X_2)+(Y_1+Y_2)+(Z_1+Z_2)}\\ y=\frac{{\mathrm{dY}}_A}{{\mathrm{dX}}_A+{\mathrm{dY}}_A+{\mathrm{dZ}}_A}=\frac{(Y_1+Y_2)}{(X_1+X_2)+(Y_1+Y_2)+(Z_1+Z_2)}\end{array}\right\}---\left(13\right)$

Can be found out that by formula (13) if LED2 is different from the original chromaticity coordinates of LED2, then the chromaticity coordinates of its any point on spherical shell is the result of its colour mixture.

Utilize structure of the present invention, can utilize the LED of different colours to blend required colourity, and that the colourity of its any point on the sphere of spherical shell shape cover body inboard and brightness still can keep is even.Therefore another embodiment of the present invention as shown in Figure 15, wherein the light source of emitting bulb can comprise a white light LEDs W or comprise LED modules with different colors, for example comprises a combination that comprises at least ruddiness, green glow, blue-ray LED R, G, B.Utilize the LED combination of different colours, can adjust different bulb colour temperatures.And structure of the present invention can because of the colourity of LED and brightness difference or the position is not different produce the inhomogeneities of colour mixture and brightness, that is to say that the colourity of any point and brightness can be considered as the mixed result of height of all LED on the lamp housing.

Comprehensively the above the invention reside in and proposes a brand-new emitting bulb, improves many disappearances of aforementioned prior art.Emitting bulb of the present invention has more other multiple advantages except having luminous evenly reaching the heat radiation well.Eight disappearances of aforementioned known techniques, emitting bulb of the present invention is better after improving can to reach following advantage:

One. the light emitting anger of emitting bulb of the present invention can reach more than 300 degree, and is with present " osram lamp " or " Electricity-saving lamp bulb ", almost equal.

Two. the Luminescence Uniformity of emitting bulb of the present invention is good, almost can be the same with " Electricity-saving lamp bulb ".

Three. the light extraction efficiency of emitting bulb of the present invention can reach 95%, and whole efficiency can by present about 60%, be brought up to about 85%.

Four. the radiating effect of emitting bulb of the present invention is about the twice of known LED emitting bulb structure, so temperature rise can reduce half, raises the efficiency and the life-span.

Five. the overall weight of emitting bulb of the present invention is reducible suitable with general " osram lamp ".

Six. the outward appearance of emitting bulb of the present invention can be similar to general " osram lamp ", and the sphere uniformly light-emitting of whole spherical shell shape cover body is without luminous dead angle.When no power, its outward appearance can be vaporific pure white, and is very attractive in appearance.

Seven. the cover body of emitting bulb of the present invention is electric insulation fully, and non-contact electric is dangerous, can use isolating transformer such as known LED emitting bulb, reduces loss of electrons, improves the electronic circuit conversion efficiency.

Eight. simple in structure because of emitting bulb of the present invention, light extraction efficiency improves, and heat-conducting effect is good, and electronic circuit can reduce cost, thereby totle drilling cost can reduce a lot of.

Emitting bulb of the present invention still may obtain following extra advantage in addition:

One. distribution density and the scope of numerous bright dipping perforation on the spherical shell shape cover body controlled in emitting bulb utilization of the present invention, can reach different distribution curve fluxs and distribute for example low-angle one direction bright dipping of " down lamp ".Thereby utilize the structure of emitting bulb of the present invention, can produce the bulb of different purposes.

Two. the whole cover body of emitting bulb of the present invention can be metal structure, and then its anti-degree of falling is higher.

By the above detailed description of preferred embodiments, be to wish more to know to describe feature of the present invention and spirit, and be not to come category of the present invention is limited with above-mentioned disclosed preferred embodiment.On the contrary, its objective is that hope can contain in the category of claim of being arranged in of various changes and tool equality institute of the present invention wish application.Therefore, the category of the claim that the present invention applies for should be done the broadest explanation according to above-mentioned explanation, contains the arrangement of all possible change and tool equality to cause it.

Claims (19)

1. emitting bulb comprises:

Light source is in order to send light; And

Cover body defines the inner space, and wherein said light source is to be arranged in the described cover body and to be connected with described cover body heat conduction, and described cover body is made and reflect extremely described inner space of light that described light source sends by Heat Conduction Material;

Form a plurality of perforation on the wherein said cover body, penetrate from described a plurality of perforation so that be arranged at the light that the described light source in the described cover body sends.

2. emitting bulb as claimed in claim 1, wherein said light source comprises at least one LED.

3. emitting bulb as claimed in claim 1, wherein said cover body is that aluminium, copper or its alloy material are made.

4. emitting bulb as claimed in claim 1, the described cover body of wherein said emitting bulb is that ceramic material is made.

5. emitting bulb as claimed in claim 1, the inboard of the described cover body of wherein said emitting bulb applies reflecting coating.

6. emitting bulb as claimed in claim 1, the outside of the described cover body of wherein said emitting bulb is coated with electrically-insulating paint.

7. emitting bulb as claimed in claim 1, the described a plurality of perforation that form on the described cover body of wherein said emitting bulb are for evenly distributing.

8. emitting bulb as claimed in claim 1, the described a plurality of perforation that form on the described cover body of wherein said emitting bulb are non-uniform Distribution.

9. emitting bulb as claimed in claim 1, the described cover body of wherein said emitting bulb is essentially spherical shell shape.

10. emitting bulb as claimed in claim 1, the described cover body of wherein said emitting bulb is essentially oval spherical shell shape.

11. emitting bulb as claimed in claim 1, the outer side covers of the described cover body of wherein said emitting bulb has photic zone.

12. emitting bulb as claimed in claim 2, wherein said light source comprise a plurality of described LED.

13. emitting bulb as claimed in claim 2, the described light source of wherein said emitting bulb can comprise white light LEDs or comprise at least the combination of ruddiness, green glow, blue-ray LED.

14. emitting bulb as claimed in claim 1, wherein said emitting bulb comprises circuit board, and described light source is to be installed on the described circuit board, and described circuit board is connected with described cover body heat conduction.

15. emitting bulb as claimed in claim 14, wherein said emitting bulb more comprises housing, and described circuit board arrangement is connected in described housing and with described housing heat conduction, and described housing is connected with described cover body heat conduction.

16. emitting bulb as claimed in claim 15, wherein said housing and described cover body are combined as a whole.

17. emitting bulb as claimed in claim 15, wherein said circuit board comprises aluminium base.

18. emitting bulb as claimed in claim 5, wherein said reflecting coating comprise barium sulfate Ba2SO4, polytetrafluoroethylene (PTFE) Teflon or titanium dioxide TiO2.

19. emitting bulb as claimed in claim 1, wherein said light source comprise at least one Organic Light Emitting Diode OLED.

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