CN101619830A - Design method of LED optical components and projector - Google Patents

Abstract

A design method of LED optical components comprises the following steps: determining the required effective luminous flux Phi n, determining luminous flux Phi i of each LED optical component, determining the collimation efficiency beta of each optical component, dividing effective luminous flux Phi n by the collimation efficiency beta of each LED optical component and then multiplies luminous flux Phi i of each LED optical component to obtain n, the number of the required LED optical components, namely, Phi n=* Phi n i * beta; the invention also provides a corresponding projector device, thus reducing the cost and energy consumption of the projector.

Description

The method for designing of LED optical element and projecting apparatus

Technical field

The present invention relates to a kind of method for designing of LED optical element, relate in particular to a kind of method for designing of the LED of raising optical element luminous flux utilization ratio, and disclose a kind of projecting apparatus that has corresponding LED optical element.

Background technology

LED is used in present illumination, has the required brightness of general lighting, efficient, service life, colour temperature and white point stability.Therefore, most general lightings are used in the design and are all adopted this class LED, comprise road surface, parking area and indoor directional lighting.In these are used, because Maintenance free (because the service life of LED is more much longer than the conventional bulb) and energy consumption reduction, so LED-based illumination has reduced the total cost of ownership.

In projecting apparatus and association area, in order to strengthen the luminance of LED, can select all generally that luminous flux is big for use, the LED of high efficiency, high output.In concrete the use, the light that LED produced be easy to the to be fixed circuit board of this LED diffuses away.So in order to make it possible to reach the luminous flux that needs standard, just need to increase more LED or select the more LED of high efficiency and bigger luminous flux for use.Owing to be, when concrete LED sets type, bring inconvenience for device inside like this, make device redundancey than adopting more LED.

In order further effectively to utilize the luminous flux of LED, problem above solving, traditional projection arrangement adds highly reflective material behind the UHP of its application bulb, and forms parabolic shape, reach light source output collimated ray, reach effective utilization of the luminous flux that strengthens LED with this.But LED exists intrinsic luminous characteristics, and optical extend is bigger, and this becomes its greatest drawback, is unfavorable for the effective utilization to its light energy.

As Chinese patent 00804656.5, name is called that " lighting apparatus " disclosed, a kind of lighting apparatus that is used for projection image comprises a shell with light emitting window, has a light source in this shell, one is used to guide light source to form the surface along optical system and an image that is arranged on respect to the optical axis vertical direction of y direction emission light beam.According to the present invention, this light source is LED, and this optical system comprises a collimator assembly that the light that is used for that LED is launched collimates.In optical system, add colimated light system, thereby improved effective utilization of LED luminous flux.But what LED optical element optimums the optical application environment for determining uses on earth, and this patent does not relate to.

Select in the method for designing, generally in the following way in present disclosed optical element quantity.

Be generally after all system effectivenesies are estimated well, can calculate the actual LED lumen number that will reach the design object needs.Optical efficiency (optics and heat) is only used in general calculating.Electrical efficiency only influences total power consumption and light fixture usefulness, and does not influence the light output quantity of illumination.Being calculated as follows of example illumination " the actual lumen that needs ": required actual lumen=target lumen/(optical efficiency * thermal efficiency).What another need be determined is the operating current of LED.Operating current is very important when the usefulness of determining the LED illumination and service life, increases operating current, and then the output of the light of each LED can become big, thereby has reduced required LED quantity.But, increase operating current and also bring a plurality of shortcomings simultaneously, for example power consumption reduces, high ambient temperature reduces and the life-span shortens etc.To the example illumination, service life and effect are to answer top-priority design object most, and this sentences listed minimum working current (350mA) work of XLamp XR-E databook, to improve the LED effect to greatest extent and to increase the service life.After operating current is determined, just can calculate the lumen output number of each LED.Because the heat loss of LED has been considered in the lumen number of actual needs calculates, so the quantity that LED supplier document provides can directly be used.Use the listed minimum flux of LED order code, rather than the typical amounts of using databook to provide, most of LED company sells according to minimum flux range, designs according to this minimum number, just can guarantee can both satisfy target call with all illuminations that this LED order code is made.The quantity of LED is calculated as follows, the lumen number of lumen number/each LED that quantity=reality of LED is required.

Summary of the invention

In order further to strengthen effective utilization of LED optical element luminous flux, the colleges and universities that the present invention has disclosed a kind of LED optical element luminous flux utilize method, mainly be effective luminous flux and the intrinsic physical characteristic of the LED optical element LED optical element quantity of calculating actual needs in the LED optical element application scenario as required, and disclosed the measure that is provided with that improves LED optical element utilization rate.

A kind of method for designing of LED optical element comprises, determines the effective luminous flux Φ that needs _n, determine the luminous flux phi of single led optical element _i, determine the collimation efficient β of single led optical element, effective luminous flux obtains the quantity n of the LED optical element that needs divided by the product of the luminous flux of the collimation efficient of single led optical element and single led optical element, promptly ${\mathrm{\Φ}}_n=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\Φ}}_i*\mathrm{\β}.$

In a preferable embodiment of the present invention, the luminous flux of single led optical element is to be determined by the product of the power P of single led optical element and luminous efficiency η.

Preferably, luminous efficiency η combine optics and/or calorifics and or/determine behind the electricity system.

In a preferable embodiment of the present invention, the collimation efficient β of LED optical element is undertaken determining after the emulation by optical simulation software collimation method.

In a preferable embodiment of the present invention, the effective luminous flux Φ that needs _nBe to determine according to the working environment of LED optical element.

In a preferable embodiment of the present invention, determined the quantity of LED optical element after, the LED optical element is arranged on the fixture, and reflex reflector is set on fixture.

Further, fixture is provided with guiding device, light channeling conduct and collection that the LED optical element is sent.

Further, in embodiments of the present invention, corresponding different LED optical element applied environments carries out difform composing to the LED optical element on fixture.

Preferably, described composing is the regular polygon shape, preferred square or regular hexagon.

The present invention has also disclosed a kind of projecting apparatus, comprises, and LED optical element and fixture, described LED optical element is arranged on the described fixture, it is characterized in that, and the quantity required n of described LED optical element is according to computing formula

${\mathrm{\Φ}}_n=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\Φ}}_i*\mathrm{\β}$

Draw, wherein Φ _iBe to learn the power P of element and the product of luminous efficiency η is determined by single led pass, described luminous efficiency η combine optics and/or calorifics and or/determine behind the electricity system; Wherein the numerical value of the collimation efficient β of LED optical element is undertaken drawing after the emulation by optical simulation software collimation method; The effective luminous flux Φ that wherein needs _nBe to determine according to the working environment of LED optical element.

The present invention is owing to main collimated light source total light flux data as required draw the LED optical element quantity that needs easily, the LED optical element that utilizes that like this can top limit gets luminous flux, saved the waste of LED optical element in illumination or display unit, reduce the cost of lighting device or display unit, and saved the energy consumption of this device.

Description of drawings

Accompanying drawing 1 is that square collimated light source light beam is arranged schematic diagram;

Accompanying drawing 2 is that regular hexagon collimated light source light beam is arranged schematic diagram;

Accompanying drawing 3 is the method flow schematic diagram of the embodiment of the invention.

The specific embodiment

Below in conjunction with accompanying drawing embodiments of the invention are described in detail, so that advantage of the present invention and benefit are easier to be understood by those skilled in the art.

In the present invention, select and be designed to example with the LED optical element of projecting apparatus product, but the method for designing that the present invention discloses can be applied to other illuminations and display system equally.

The present invention discloses a kind of luminous flux that fully effectively utilizes the LED optical element, and is implemented in the applications such as projection arrangement, illumination effective utilization of LED optical element.Promptly behind clear and definite light source output demand luminous flux, according to method for designing of the present invention, calculate the quantity required of LED optical element, and the LED optical element set-up mode that discloses according to the present invention, economic LED type selecting scheme is provided, save time and manpower, and improve the utilization rate of LED optical element, satisfy energy-saving and cost-reducing and environmental requirement.

In projector design, traditional projection arrangement adds highly reflective material behind the UHP of its application bulb, and forms parabolic shape, reaches light source output collimated ray, reaches effective utilization of the luminous flux that strengthens LED with this.

As as shown in the method for designing flow chart 3 of the LED optical element of the present invention of example, in design process of the present invention, one of most important parameter is to need what LED could satisfy design object.Other design decision all is to launch around LED quantity, because LED quantity directly influences light output, power consumption and illumination cost.

Check the typical light flux that the LED databook is listed, remove the design object lumen with this number, this method is very tempting.Yet in the practical application, this method of having simplified must be provided with enough surpluses, inaccuracy and cause economicly inadequately, otherwise design will be satisfied the lighting requirement of using according to this.

In order further to strengthen effective utilization of LED optical element luminous flux, what the invention provides a kind of LED luminous flux effectively utilizes method, mainly be effective luminous flux and the intrinsic physical characteristic of the LED optical element quantity of calculating the LED optical element that needs under the types of applications environment as required, thereby reach the purpose that LED effectively utilizes, avoid the quantity of meaningless increase LED optical element, saved the cost of whole design and satisfied energy-saving and cost-reducing demand.

The luminous flux of LED depends on multiple factor, comprises drive current and junction temperature, accurately calculate needed quantity, must at first estimate the inefficiency of optics, heat and electrical system.Following table is the loss efficiency parameters of LED optical element under the sorts of systems.

System	Efficient	Type
			Hot system	??85％	Light
Optical system	??91％	Light
			Electricity system	??87％	Power

Referring to Fig. 3, the embodiment of the invention is specific as follows: the definite effective luminous flux Φ that needs of step S1 _n, promptly actual application environment is determined the effective luminous flux Φ that it needs _nStep S2 determines the luminous flux phi of single led optical element _i, the power of supposing every LEDs optical element is P, and luminous efficiency is η, and the total light flux that then every LEDs optical element sends is Φ _i=P* η; Step S3 determines the collimation efficient β of single led optical element, and after adjusting through collimation, the collimation efficient of every LEDs optical element is β, and collimation efficient herein is to have carried out the data that emulation obtains afterwards by optical simulation software collimation method; Step S4 effective luminous flux Φ _nLuminous flux phi divided by single led optical element collimation efficient β and single led optical element _iProduct obtain the quantity n of the LED optical element that needs, promptly n LEDs optical element available effective luminous flux after collimating is

${\mathrm{\Φ}}_n=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}(\mathrm{\η}*P_i*\mathrm{\β})$

Thus, we can effective luminous flux as required calculate the quantity of the LED optical element that needs,

$n=\frac{{\mathrm{\Φ}}_n}{\mathrm{\η}*P_i*\mathrm{\β}}$

η is according to the specification of LED optical element and established data herein, and P is according to the determined data of the working environment of LED optical element, and β is the data that obtain after simulating according to optical simulation software collimation method.Definite herein effective luminous flux Φ that needs _n, determine the luminous flux phi of single led optical element _iAnd the collimation efficient of determining single led optical element is between the step of β, do not distinguish sequencing.

Secondary optics is an optical element additional except that primary optics (i.e. LED optical element herein), is used for light output the carrying out shaping to the LED optical element.General secondary optics type is reflection (light is from certain return reflection surface), perhaps refraction (light is by the refractive material bending, and refractive material is generally glass or plastics).Secondary optics can be by buying standard component, ready-made part or simulating design customization with lighting model by ray trace.Each LED optical element uses a secondary optics, and the beam angle of each LED just can customize, thereby obtains required accurate light image output.For example, can dwindle the beam angle of each LED optical element, for illumination is optimized in an illumination, rather than be general lighting optimization.

In an embodiment of the present invention, in projecting apparatus, the plurality of LEDs optical element is welded on the fixture, a support plate for example is set, thereby fixedly installed,, on the fixture of LED optical element, added reflector in order further to increase effective utilization of LED optical element, add collimation lens before the LED optical element, this structure is very helpful to the raising tool of the utilization ratio of optical energy of LED optical element.In addition, the present invention also provides another implementation method, and to collect by the light of secondary optics with the LED optical element, the collimation back is for using.Specifically be the mode that has adopted leaded light, promptly add photoconductive tube before LED optical element light-emitting area, the light that the LED optical element is sent collects, thereby increases operation rate.

In order further to increase effective utilization of LED, in the embodiment of the invention, designed according to different applied environments, the beam shape of needed collimated light source is set type accordingly, thereby the light shape of output can satisfy the demands and increase operation rate to greatest extent.For example foursquare if desired collimated light source light beam can adopt the arrangement mode of Fig. 1, and its LED optical element is the arrangement mode that adopts four summits of square.Regular hexagon or circular collimated light source light beam if desired can be taked the arrangement mode of Fig. 2, and its any three adjacent LED optical elements are the arrangement modes that adopt the equilateral triangle summit.As required, the LED optical element also can be taked the mode that arrange on the regular pentagon summit.

In order further to increase effective utilization of LED optical element, in the embodiment of the invention, having designed increases cooling system in projecting apparatus, by cooling system control junction temperature, thus the utilization rate of raising LED optical element.

The main collimated light source total light flux data as required of the present invention draw the LED optical element quantity that needs easily, and the LED optical element that utilizes that like this can top limit gets luminous flux.The waste of saving LED optical element in device.

The above; it only is the specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; any those of ordinary skill in the art are in the disclosed technical scope of the present invention; variation or the replacement that can expect without creative work all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection domain that claims were limited.

Claims (10)

1, a kind of method for designing of LED optical element comprises, determines the effective luminous flux Φ that needs _n, determine the luminous flux phi of single led optical element _i, determine the collimation efficient β of single led optical element, effective luminous flux Φ _nDivided by the collimation efficient β of single led optical element and the luminous flux phi of single led optical element _iProduct obtain the quantity n of the LED optical element that needs, promptly ${\mathrm{\Φ}}_n=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\Φ}}_i*\mathrm{\β}.$

2, the method for designing of LED optical element as claimed in claim 1 is characterized in that, the luminous flux phi of described single led optical element _iBe to determine by the power P of single led pass element and the product of luminous efficiency η.

3, the method for designing of LED optical element as claimed in claim 1 is characterized in that, described luminous efficiency η combine optics and/or calorifics and or/determine behind the electricity system.

4, the method for designing of LED optical element as claimed in claim 1 is characterized in that, the numerical value of the collimation efficient β of described LED optical element is undertaken drawing after the emulation by optical simulation software collimation method.

5, the method for designing of LED optical element as claimed in claim 1 is characterized in that, the effective luminous flux Φ of described needs _nBe to determine according to the working environment of LED optical element.

6, as the method for designing of the described LED optical element of one of claim 1～5, it is characterized in that, also be included in the quantity of having determined the LED optical element after, the LED optical element is arranged on the fixture, and reflex reflector is set on fixture.

7, as the method for designing of the described LED optical element of one of claim 1～5, it is characterized in that, after also being included in the quantity of having determined the LED optical element, the LED optical element is arranged on the fixture, fixture is provided with guiding device, light channeling conduct and collection that optical element is sent.

8, as the method for designing of the described LED optical element of one of claim 1～5, it is characterized in that, after also being included in the quantity of having determined the LED optical element, the LED optical element is arranged on the fixture, corresponding different LED optical element applied environments carries out difform composing to the LED optical element on fixture.

9, the method for designing of LED optical element as claimed in claim 8 is characterized in that, described composing is the regular polygon shape.

10, a kind of projecting apparatus comprises, LED optical element and fixture, and described LED optical element is arranged on the described fixture, it is characterized in that, and the quantity required n of described LED optical element is according to computing formula

${\mathrm{\Φ}}_n=\underset{i=1}{\overset{n}{\mathrm{\Σ}}}{\mathrm{\Φ}}_i*\mathrm{\β}$

Draw, wherein Φ _iBe to learn the power P of element and the product of luminous efficiency η is determined by single led pass, described luminous efficiency η combine optics and/or calorifics and or/determine behind the electricity system; Wherein the numerical value of the collimation efficient β of LED optical element is undertaken drawing after the emulation by optical simulation software collimation method; The effective luminous flux Φ that wherein needs _nBe to determine according to the working environment of LED optical element.

Images