CN102122060B - Composite light condensation device - Google Patents

Abstract

The invention discloses a composite light condensation device, which comprises a main body having a refractive index n, wherein the main body further comprises an incidence surface and a light emitting surface. The light emitting surface is at least a Fresnel lens structure group, when an incident light is projected through the Fresnel lens structure, a focal point is formed on a central line of the Fresnel lens structure group, and the distance between the focal point and the incidence surface is a focal length F; the light emitting surface comprises a first Fresnel lens structure and a second Fresnel lens structure connected therewith, and the second Fresnel lens structure is provided with a plurality of lens bodies arranged sequentially, the number of the lens bodies is j from the central line to the periphery, and the distance between two adjacent lens bodies is p; a basic surface is defined in a vertical direction extending from the central line of the Fresnel lens structure, the distance between the basic surface and the light emitting surface of each lens body is Tj, so the emergent light of the incident light passing through the lens body forms an angle alpha j with the light emitting surface, a deflection angle of the emergent light is changed through changing the Tj sequentially, and shorter focal length and better light condensation effect are generated. The angle meets the following equation: alpha j=1/2*cos<-1>(-1/n*cos[tan<-1>*(2jp/(F-Tj))].

Description

Composite light condensation device

Technical field

The present invention relates to a kind of composite light condensation device, be particularly related to and in a lens body, form respectively refraction and reflector space, phacoid thickness by design reflectivity region changes light deflection angle, obtains shortening focal length and the composite light condensation device that increases light-gathering effect.

Background technology

Fresnel Lenses (Fresnel lens) is generally the lens of a concentric structure, conventionally formed by light transmissive materials such as a glass or plasthetics, with respect to other conventional lenses, Fresnel Lenses can pass through more light with thinner eyeglass, and projects farther distance.

Can be with reference to the Fresnel lens structure schematic diagram of prior art shown in figure 1, according to the lens arrangement showing in figure, be formed with the zigzag Fresnel lens structure 101 of multiple proper alignment in a side of lens body 10, this type of Fresnel lens structure 101 can be formed by a monoblock light transmissive material, also can be multiple independently phacoiies is combined to form, the lower edge of each phacoid forms the inclined-plane of a refracted ray, has fixing structural thickness T from lens body 10 surfaces to beveled end.

Because having, Fresnel Lenses shortens the characteristic that focal length and light-gathering are good, thus except for throw light, more can be used as the purposes of optically focused, such as the solar collector (solar collector) of collection sunshine.Can be with reference to the Fresnel lens structure optically focused schematic diagram of prior art shown in figure 2, in figure, show that light is through lens body 10, after being reflected by the Fresnel lens structure 101 of one side, focus on focus 20, focal length is F, due to can be effectively through the phacoid inclined-plane that designed in a short distance by light-ray condensing in a focus, therefore there is good spotlight effect.

Summary of the invention

The Fresnel lens structure of application prior art, the object of the invention is to propose a kind of composite light condensation device that shortens focal length and increase light-gathering that has, in the lens body of this composite light condensation device, differentiation has refraction and reflector space, phacoid thickness with design reflectivity region changes light deflection angle, obtains calculating parameter and defines to reach the effect that shortens focal length and increase light-gathering.

Composite light condensation device includes lens body, made by the light transmissive material with refractive index n, include an incidence surface and an exiting surface, wherein exiting surface has a Fresnel Lenses (Fresnel lens) structure at least, when this Fresnel lens structure of light incident, being concentrated on the focus and the focal length that on center line, form is F.Wherein, this Fresnel lens structure has one for the first Fresnel lens structure of index ellipsoid and one second Fresnel lens structure that is reflector space.

The first Fresnel lens structure is multiple first lens bodies of sequentially arranging along having on first foundation face, outwards be counted as i by center line, the exiting surface of first foundation face and lens body is apart T, adjacent first lens body is at a distance of being p, first lens body and first foundation face extend to form the first angle [alpha] _i, this angle meets following equation:

${\mathrm{\&alpha;}}_i={\tan }^{-1}\left(\frac{\sin \left[{\tan }^{-1}\left(\frac{2\mathrm{ip}}{F-T}\right)\right]}{\cos \left[{\tan }^{-1}\left(\frac{2\mathrm{ip}}{F-T}\right)\right]-n}\right);$

The second Fresnel lens structure is connected with the first Fresnel lens structure, the second Fresnel lens structure has multiple second phacoiies of sequentially arranging, be counted as j by center line to outer rim, adjacent the second phacoid has spacing p apart, each second phacoid edge is defined as the second fundamental plane with the vertical direction that the center line of lens arrangement extends, and the exiting surface of the second fundamental plane and lens body is apart T _j, this is variable, by design, makes incident light pass through the second phacoid and forms an emergent light, forms the second angle [alpha] with exiting surface _j, the second angle meets following equation:

${\mathrm{\&alpha;}}_j=\frac{1}{2}{\cos }^{-1}[-\frac{1}{n}\cos \left({\tan }^{-1}\left(\frac{2\mathrm{ip}}{F-T_j}\right)\right)].$

The beneficial effect of composite light condensation device of the present invention is, according to the design of each parameter, composite light condensation device is formed with the design of index ellipsoid and reflector space, can shorten the distance that arrives focus through this composite light condensation device, effectively increases light-gathering.

Separately have embodiment on the incidence surface of above-mentioned body, to form a zigzag lens arrangement, zigzag lens arrangement changes the angle that incident light enters body whereby, to shorten focal length.

Brief description of the drawings

Fig. 1 is the Fresnel lens structure schematic diagram of prior art;

Fig. 2 is the Fresnel lens structure optically focused schematic diagram of prior art;

Fig. 3 is the schematic top plan view of composite light condensation device the first embodiment of the present invention;

Fig. 4 is side-looking and its optically focused schematic diagram of composite light condensation device the first embodiment of the present invention;

Fig. 5 is the depth-to-width ratio curve map of the present invention and prior art;

Fig. 6 is the index ellipsoid angular relationship figure of composite light condensation device;

Fig. 7 is the reflector space structure angle graph of a relation of composite light condensation device of the present invention;

Fig. 8 is the reflector space structure angular relationship of composite light condensation device of the present invention and prior art;

Fig. 9 is side-looking and its optically focused schematic diagram of composite light condensation device the second embodiment of the present invention;

Figure 10 is side-looking and its optically focused schematic diagram of composite light condensation device of the present invention the 3rd embodiment;

Figure 11 is the opticpath schematic diagram of composite light condensation device the second embodiment of the present invention;

Figure 12 is the depth-to-width ratio curve map of composite light condensation device the second embodiment of the present invention and prior art.

Wherein, description of reference numerals is as follows:

Lens body 10 Fresnel lens structures 101

Structural thickness T focus 20

Focal length F lens body 30

Index ellipsoid 301 reflector spaces 303

Count i phacoid width p

Fixed sturcture thickness t 0 phacoid rake angle α

First lens body rake angle α 1 second phacoid rake angle α 2

Optical collector 40,92,12 beam angle β

Incidence surface rake angle γ the first beam angle β 1

The second beam angle β 2 incidence surface broached-tooth designs 90,14

First foundation face 60 second fundamental planes 70

Light 41,11 incidence surfaces 31

Exiting surface 32 is counted j

Embodiment

The present invention proposes a kind of composite light condensation device, applies especially the architectural feature of Fresnel Lenses (Fresnel lens), by optical design, forms and shortens focal length and increase light-gathering.

With reference to the side view of the schematic top plan view of composite light condensation device of the present invention shown in figure 3 and the composite light condensation device of Fig. 4.Fig. 3 illustrates that a Fresnel Lenses of composite light condensation device is generally the lens of a concentric structure, and this figure is shown as a concentrically ringed lens arrangement phacoid (lens body 30), and has a specific refractive index n.Wherein, every circle of this concentric structure shows in the multiple zigzag lens phacoiies in the lens body 30 of composite light condensation device for this reason, can and the side view of the corresponding diagram 4 composite light condensation device embodiment shown in aobvious, this embodiment distinguishes and has two regions with explanation, the Fresnel Lenses of inner round portion is shown as the index ellipsoid 301 (the first Fresnel lens structure) with identical lens body thickness, and it is reflector space 303 (the second Fresnel lens structure) that the part that approaches this concentric circles outer rim has not identical lens body thickness.

The schematic diagram that composite light condensation device as shown in Figure 4 and its light are advanced is known, this composite light condensation device comprises an incidence surface 31 and an exiting surface 32, the Fresnel lens structure that this exiting surface 32 comprises above-mentioned two kinds of forms, forms a side that is arranged at same level.The structure of this composite light condensation device has a thickness T, by the design of thickness T, wherein, reflector space 303 forms the phacoid of different-thickness T, by structure centre outwards successively label count i, each phacoid width is shown as p, therefore the distance of each phacoid distance center is ip.The thickness T of the outside progressive additive of each phacoid of reflector space, also for changing gradually phacoid rake angle tangent value (tan α), produces the effect that changes reflection ray angle, converges light 41 on optical collector 40, and can effectively shorten focal length F.

According to embodiment, the first Fresnel lens structure of index ellipsoid 301 shown in Fig. 4 has identical thickness T, as Fresnel lens structure of the prior art, each angle of incidence of light enters the zigzag oblique angle face of phacoid, and a light 41 focuses on optical collector 40 through unirefringence mode.Wherein, the second Fresnel lens structure on reflector space 303 is designed with different structural thickness T, form phacoid rake angle α, this light 41 is through after lens, pass through primary event and unirefringence and penetrate focusing, wherein, in a total reflection of the upper formation of the zigzag oblique angle of each phacoid face (rake angle α), carry out another unirefringence through lens body surfaces afterwards, light 41 be refracted and focus on optical collector 40.

The depth-to-width ratio curve map of the present invention shown in Fig. 5 and prior art, the transverse axis of this curve map is shown as a numerical value F#, be defined as F#=(F-T)/2ip, wherein F is that focal length, T are that lens arrangement thickness, i are that count value, p are phacoid width, F# is represented as different design focal lengths (F), and F# value is to define index ellipsoid and reflector space.As shown in Figure 5, F# is 0.5 o'clock separation of refraction and reflector space in embodiment for this reason, and this numerical value can change according to design.The longitudinal axis is the tangent value (tan α) of rake angle α, be represented as lens depth-to-width ratio, change thickness (T) taking transverse axis F# and longitudinal axis depth-to-width ratio as reference frame, to design best parameter, and produce lower Fresnel Lenses depth-to-width ratio or less F# value, to collect more light on focal length.

The reflector space of composite light condensation device shown in Fig. 5, with respect to existing reflection depth-to-width ratio, the present invention has lower lens depth-to-width ratio, the lens arrangement that the present invention proposes makes the tangent value of rake angle α less, the namely design of α angle is less and obtain less F# value, makes the composite light condensation device structure that Fig. 4 shows can collect more light focusing.

Figure 6 shows that the index ellipsoid angular relationship figure of composite light condensation device, illustrate the part phacoid structure of index ellipsoid, wherein the focal length of whole lens is F, one first foundation face 60 of the first Fresnel lens structure definition horizontal direction in index ellipsoid, on first foundation face 60, be formed with multiple first lens bodies, first lens body is sequentially counted as i by the center line of overall lens to outer rim (both sides), the exiting surface upper limb of each phacoid and first foundation face 60 have a fixed range T (namely bottom ramp structure upper limb is to incidence surface thickness), in this region, each phacoid structural thickness is fixed sturcture thickness t ₀.And adjacent two first lens bodies have a spacing p apart, therefore the whole lens center of each phacoid distance distance is ip.

In this example, first lens body and first foundation face 60 extend to form the first angle (α _i), namely, light is entered by incidence surface 31, has the first angle (α through phacoid one end _i) ramp structure refraction and go out.There is the first angle (α through this _i) the light of ramp structure refraction, definition one beam angle β is the angle of the direct of travel of incident ray and refracted ray, has following relationship and derivation between α and β:

n?sinα＝sin(α+β)--------(1)

$\tan \mathrm{\&beta;}=\frac{\mathrm{ip}}{F-t_0}---\left(2\right)$

Known $F\#=\frac{F-t_0}{2\mathrm{ip}}---\left(3\right)$

Draw $\mathrm{\&alpha;}={\tan }^{-1}\left(\frac{A}{B}\right)---\left(4\right)$

Wherein

$A=\sin \left[{\tan }^{-1}\left(\frac{1}{2F\#}\right)\right]---\left(5\right)$

$B=\cos \left[{\tan }^{-1}\left(\frac{1}{2F\#}\right)\right]-n---\left(6\right)$

The first angle (α herein _i) meet following equation (7):

${\mathrm{\&alpha;}}_i={\tan }^{-1}\left(\frac{\sin \left[{\tan }^{-1}\left(\frac{2\mathrm{ip}}{F-T}\right)\right]}{\cos \left[{\tan }^{-1}\left(\frac{2\mathrm{ip}}{F-T}\right)\right]-n}\right)---\left(7\right)$

Shown in Fig. 6, parameter F # determines the index ellipsoid 301 and reflector space 303 of Fresnel Lenses, in the situation such as F# >=0.5, defines index ellipsoid 301.Thickness T in index ellipsoid 301 between exiting surface 32 and first foundation face 60 is constant, and in reflector space 303, design changes thickness.

The reflector space structure angle graph of a relation of the collector lens of the present invention showing with reference to figure 7.The focal length of lens arrangement is F, the second Fresnel lens structure in reflector space 303 is connected with the first Fresnel lens structure, the second Fresnel lens structure is made up of multiple the second phacoiies that are arranged in order equally, each second phacoid defines the second fundamental plane 70 of a horizontal direction along the vertical direction of extending with center line, count with integral central alignment both sides, the second phacoid in reflector space be counted as j (with index ellipsoid Fresnel Lenses body counting i distinguish), adjacent two the second phacoiies are apart p (phacoid width), exiting surface 32 upper limbs of the second fundamental plane 70 and the second phacoid are at a distance of one apart from T=Tj (the namely thickness between exiting surface inclined-plane upper limb and incidence surface), oblique angle on the second phacoid exiting surface 32 and the second fundamental plane 70 form the second angle (α _j), namely phacoid rake angle.

When this lens arrangement of light incident, by gradient (the second angle [alpha] through each the second phacoid exiting surface _j) once (total reflection) of reflection, reflected light reflects and goes out through a side of the second phacoid again, and the direction of refraction course and vertical incidence light (center line) defines a beam angle β, has following relationship and derivation between α and β:

β＝90-sin ^-1[n?sin(2α-90)]--------(8)

$\tan \mathrm{\&beta;}=\frac{\mathrm{jp}}{F-T_j}---\left(9\right)$

Known $F\#=\frac{F-{\mathrm{<figure-callout\; id="2"\; label="T\; j"\; filenames="H2010100020613E00042.png"\; state="\{\{state\}\}">T</figure-callout>}}_j}{2\mathrm{jp}}---\left(10\right)$

The second angle [alpha] _jmeet following equation (11):

${\mathrm{\&alpha;}}_j=\frac{1}{2}{\cos }^{-1}[-\frac{1}{n}\cos \left({\tan }^{-1}\left(\frac{2\mathrm{ip}}{F-T_j}\right)\right)]---\left(11\right)$

According to above-described embodiment, utilize parameter F # to define reflector space, in the situation such as F# < 0.5, define this reflector space.

Shown in Fig. 7, exiting surface 32 upper limbs of the second fundamental plane 70 and the second phacoid distance T is apart a variable, is multiple phacoiies with different-thickness at the second Fresnel lens structure of reflector space, and structure reaches preferably spotlight effect whereby.

Please refer to the present invention of Fig. 8 demonstration and the reflector space structure angular relationship of prior art, this figure is phacoid (having phacoid rake angle α 1 and beam angle β 1) and the angular relationship of the present invention between the Fresnel Lenses body (having phacoid rake angle α 2 and beam angle β 2) of reflector space of prior art, in figure, show that incident light 11 enters lens 30, the triangle of top is shown as prior art and has phacoid 30 structures of phacoid rake angle α 1, light 11 enters after Fresnel Lenses body through reflection, go out in a side refraction again, to form optic angle β 1, below is shown as Fresnel Lenses body of the present invention and has a Fresnel Lenses body rake angle α 2 and thickness T (j), after entering, light 11 forms total reflection, form optic angle β 2 in the one side refraction of Fresnel Lenses body, the lens thickness difference of the phacoid of prior art and the technology of the present invention is d, to obtain phacoid depth-to-width ratio difference as following formula (12):

$\tan \mathrm{\&alpha;}1-\tan \mathrm{\&alpha;}2\&cong;\left|\frac{T-d}{p}\right|=\frac{1}{p}\left[\right|T-\frac{\mathrm{<figure-callout\; id="2"\; label="jp"\; filenames="H2010100020613E00042.png"\; state="\{\{state\}\}">jp</figure-callout>}}{2}|\frac{1}{\tan \mathrm{\&beta;}1}-\frac{1}{\tan \mathrm{\&beta;}2}|\left|\right]---\left(12\right)$

Wherein, if taking identical each phacoid numbering j and each phacoid width p as example, the present invention application has compared with the phacoid of lenslet body rake angle α, less depth-to-width ratio (tan α), larger beam angle β, to produce preferably spotlight effect, with shorter focal length.

In order to reach the object of the short focal length of composite light condensation device of the present invention and better light-gathering, the embodiment that another forms zigzag lens arrangement on the incidence surface 31 of lens body is also proposed, by revising the deviation angle of incident light, reach the benefit of less Fresnel Lenses body rake angle, less depth-to-width ratio and shorter focal length.

Please refer to the side view of the second embodiment of the invention shown in Fig. 9, the lens body 30 of the composite light condensation device that the present invention proposes can be divided into the incidence surface 31 and the exiting surface 32 that receive light 11, each Fresnel lens structure is to be positioned at exiting surface 32, to form the effect of a focusing, zigzag lens arrangement in this embodiment is to be placed on the incidence surface 31 of body 30, enters the angle of lens body 30 to change Fresnel Lenses body thickness (T) and incident light.

Fig. 9 is known, lens body 30 incidence surfaces 31 have a printing opacity laciniation 90 with a thickness T, if by from shown in vertical view, this laciniation 90 is a concentric circles or similar lens arrangement, because of for a change the angle that enters of light, must affect the design of the Fresnel lens structure of exiting surface 32, the top incidence surface 31 that index ellipsoid 301 is positioned at exiting surface 32 tops there is no any laciniation, but be formed at the incidence surface 31 above exiting surface 32 reflector spaces, therefore, for each phacoid that will reach Fresnel lens structure in reflector space 303 still can produce the effect of total reflection, therefore should revise each phacoid rake angle α, changed the position (optical collector 92) focusing on simultaneously, namely focal length F is shorter.

Figure 10 shown in this 3rd embodiment, on the incidence surface 31 of lens body 30, form incidence surface 31 structures that combined by multiple zigzag lens arrangements 14, can produce different focusing effects, comprise and shorten focal length and better focal position (optical collector 12).Answer equally the corresponding structure of revising exiting surface 32 each Fresnel Lenses bodies 30, for example: revise Fresnel Lenses body 30 rake angle α.

The lens arrangement of zigzag shown in Figure 11 is formed at lens body 30 tops, Fresnel Lenses body 30 refractive index ns, and each Fresnel lens structure 30 is jp and focal length F apart from lens center linear distance, fixed lens body 30 thickness t ₀for example.Light 11 vertical incidence enter lens body 30 and enter zigzag lens arrangement, it has incidence surface 31 rake angle γ, through Fresnel lens structure 30 deviations thus the incident angle of light 11, and on the inclined-plane of the Fresnel lens structure 30 of exiting surface 32, form total reflection, reflected by Fresnel lens structure, light 11 focuses on a focal position again.

The rake angle γ of above-mentioned laciniation and beam angle β, lens body rake angle α have the relation of following formula (13):

$\mathrm{\&beta;}=90-{\sin }^{-1}\left(n\sin \right[2(\mathrm{\&alpha;}+\mathrm{\&gamma;}-\frac{\sin \mathrm{\&gamma;}}{n})-90\left]\right)---\left(\text{13}\right)$

Known tan β=jp/ (F-t ₀).

Lens oblique angle α _jmeet following equation:

${\mathrm{\&alpha;}}_j=\frac{1}{2}{\cos }^{-1}(-\frac{1}{n}\cos [{\tan }^{-1}\left(\frac{1}{2F\#}\right)\left]\right)-\mathrm{\&gamma;}+\frac{\sin \mathrm{\&gamma;}}{n}$

Wherein F#=(F-T ₀)/2jp.

Zigzag lens arrangement produces below Fresnel lens structure correction phacoid rake angle α _j, and change beam angle β to shorten focal length.

Figure 12 shows that the depth-to-width ratio curve map of second embodiment of the invention and prior art.The transverse axis of this curve map is shown as numerical value F#, be defined as F#=(F-T)/2jp, the longitudinal axis is the tangent value (tan α) of rake angle α, is defined as depth-to-width ratio, and wherein F is that focal length, T are that lens thickness, j are that count value, p are phacoid width.

As the curved line relation of Fig. 5, the rake angle γ of incidence surface 31 laciniations in Figure 12, composite light condensation device of the present invention, on reflector space, to be provided with incidence surface 31 laciniations, in figure, show respectively sawtooth rake angle (γ=2 °) and (γ=5 °) two kinds of curves, no matter be why (γ=2 ° or γ=5 °) of γ angle, these incidence surface 31 laciniations, its depth-to-width ratio at reflector space 303 all can be come littlely than Fresnel lens structure of the prior art, that is, taking transverse axis F# and longitudinal axis depth-to-width ratio as reference frame, can design minimum focal length, because light path shortens, so can collect more light in focus.

In sum, the present invention is the Fresnel lens structure of application prior art, propose a kind of composite light condensation device with shorter focal length, thinner and better light-gathering, Fresnel Lenses body thickness changes light deflection angle, obtains the effect of shorter focal length and better light-gathering.

Only the foregoing is only better possible embodiments of the present invention, non-ly therefore limit to the scope of the claims of the present invention, therefore such as use the equivalent structure that instructions of the present invention and diagramatic content are done to change, be all in like manner contained in scope of the present invention, close and give Chen Ming.

Claims (12)

1. a composite light condensation device, described device includes:

One body, there is a refractive index n, this body also comprises an incidence surface and an exiting surface, this exiting surface is at least one group of Fresnel lens structure, in the time that projection one incident light passes through this group Fresnel lens structure, on a center line of this group Fresnel lens structure, be formed with a focus, this focus and this incidence surface are at a distance of a focal length F, it is characterized in that, this group Fresnel lens structure has:

One first Fresnel lens structure, it is along having multiple first lens bodies of sequentially arranging on a first foundation face, and count i this first lens body to both sides with this center line, this first foundation face and this exiting surface upper limb are at a distance of a fixed range T, adjacent two these first lens bodies have a spacing p apart, and this first lens body and this first foundation face extend to form one first angle [alpha] _i, this first angle meets following equation:

${\mathrm{\&alpha;}}_i={\tan }^{-1}\left(\frac{\sin \left[{\tan }^{-1}\left(\frac{2\mathrm{ip}}{F-T}\right)\right]}{\cos \left[{\tan }^{-1}\left(\frac{2\mathrm{ip}}{F-T}\right)\right]-n}\right);$

One second Fresnel lens structure, it is connected with this first Fresnel lens structure, this second Fresnel lens structure has multiple second phacoiies of sequentially arranging, and count j this second phacoid to both sides with this center line, adjacent two these second phacoiies have this spacing p apart, each second phacoid has one second fundamental plane along the vertical direction definition of extending with this center line, and this second fundamental plane and this exiting surface upper limb are apart one apart from T _j, this second phacoid exiting surface and this second fundamental plane extend to form one second angle [alpha] _j, this second angle meets following equation:

${\mathrm{\&alpha;}}_j=\frac{1}{2}{\cos }^{-1}[-\frac{1}{n}\cos \left({\tan }^{-1}\left(\frac{2\mathrm{jp}}{F-T_j}\right)\right)];$

Wherein, the first described Fresnel lens structure is the index ellipsoid of a same thickness;

The second described Fresnel lens structure is a reflector space for same thickness not.

2. composite light condensation device as claimed in claim 1, is characterized in that, in meeting the equation of this first angle, by parameter (F-T)/(2ip) the define scope of this index ellipsoid.

3. composite light condensation device as claimed in claim 2, is characterized in that, if described parameter (F-T)/(2ip) be more than or equal to 0.5, be defined as this index ellipsoid.

4. composite light condensation device as claimed in claim 1, is characterized in that, in meeting the equation of the second described angle, by parameter (F-T _j)/(2jp) defines the scope of this reflector space.

5. composite light condensation device as claimed in claim 4, is characterized in that, if described parameter (F-T _j)/(2jp) is less than 0.5, is defined as this reflector space.

6. a composite light condensation device, described device includes:

One body, there is a refractive index n, this body also comprises an incidence surface and an exiting surface, this exiting surface is at least one group of Fresnel lens structure, in the time that projection one incident light passes through this group Fresnel lens structure, on a center line of this group Fresnel lens structure, be formed with a focus, this focus and this incidence surface are at a distance of a focal length F, it is characterized in that, this group Fresnel lens structure has:

One first Fresnel lens structure, it is along having multiple first lens bodies of sequentially arranging on a first foundation face, and count i this first lens body to both sides with this center line, this first foundation face and this exiting surface upper limb are at a distance of a fixed range T, adjacent two these first lens bodies have a spacing p apart, and this first lens body and this first foundation face extend to form one first angle [alpha] _i, this first angle meets following equation:

${\mathrm{\&alpha;}}_i={\tan }^{-1}\left(\frac{\sin \left[{\tan }^{-1}\left(\frac{2\mathrm{ip}}{F-T}\right)\right]}{\cos \left[{\tan }^{-1}\left(\frac{2\mathrm{ip}}{F-T}\right)\right]-n}\right);$

One second Fresnel lens structure, it is connected with this first Fresnel lens structure, this second Fresnel lens structure has multiple second phacoiies of sequentially arranging, and count j this second phacoid to both sides with this center line, adjacent two these second phacoiies have this spacing p apart, each second phacoid has one second fundamental plane along the vertical direction definition of extending with this center line, and this second fundamental plane and this exiting surface upper limb are apart one apart from T _j, this second phacoid exiting surface and this second fundamental plane extend to form one second angle [alpha] _j, this second angle meets following equation:

${\mathrm{\&alpha;}}_j=\frac{1}{2}{\cos }^{-1}[-\frac{1}{n}\cos \left({\tan }^{-1}\left(\frac{2\mathrm{jp}}{F-T_j}\right)\right)];$ And

One zigzag lens arrangement, is arranged on the incidence surface of this body, enters the angle of this body in order to change this incident light;

The first described Fresnel lens structure is the index ellipsoid of a same thickness;

The second described Fresnel lens structure is a reflector space for same thickness not.

7. composite light condensation device as claimed in claim 6, is characterized in that, in meeting the equation of the first described angle, by parameter (F-T)/(2ip) the define scope of this index ellipsoid.

8. composite light condensation device as claimed in claim 7, is characterized in that, if described parameter (F-T)/(2ip) be more than or equal to 0.5, be defined as this index ellipsoid.

9. composite light condensation device as claimed in claim 6, is characterized in that, in meeting the equation of the second described angle, by parameter (F-T _j)/(2jp) defines the scope of this reflector space.

10. composite light condensation device as claimed in claim 9, is characterized in that, if described parameter (F-T _j)/(2jp) is less than 0.5, is defined as this reflector space.

11. composite light condensation devices as claimed in claim 6, is characterized in that, the rake angle γ of described zigzag lens arrangement, meets following equation:

${\mathrm{\&alpha;}}_j=\frac{1}{2}{\cos }^{-1}(-\frac{1}{n}\cos [{\tan }^{-1}\left(\frac{1}{2F\#}\right)\left]\right)-\mathrm{\&gamma;}+\frac{\sin \mathrm{\&gamma;}}{n},$

Wherein F#=(F-T _j)/2jp.

12. composite light condensation devices as claimed in claim 11, is characterized in that, described zigzag lens arrangement is a concentrically ringed lens arrangement.

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