CN102122060A - 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.

Description

The combined concentration device

Technical field

The present invention relates to a kind of combined concentration device, be particularly related to and on a lens body, form refraction and reflector space respectively, phacoid thickness by the design reflectivity zone changes the light deflection angle, obtains shortening focal length and the combined concentration device that increases the optically focused effect.

Background technology

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

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

Because Fresnel Lenses has the focal length of shortening and the good characteristic of optically focused, thus except being used for throw light, more can be used as the purposes of optically focused, such as the solar collector (solar collector) of collecting sunshine.Can be with reference to the Fresnel Lenses structure optically focused synoptic diagram of prior art shown in Figure 2, show among the figure that light is through lens body 10, after Fresnel Lenses structure 101 refractions by the one side, focus on focus 20, focal length is F, since through the phacoid inclined-plane that design can be effectively in a short distance with light-ray condensing on a focus, so have good spotlight effect.

Summary of the invention

Use the Fresnel Lenses structure of prior art, the objective of the invention is to propose a kind of combined concentration device that shortens focal length and increase optically focused that has, on the lens body of this combined concentration device, differentiation has refraction and reflector space, phacoid thickness with the design reflectivity zone changes the light deflection angle, obtains the calculating parameter definition and shortens focal length and the effect that increases optically focused to reach.

The combined concentration device includes lens body, make by 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, during this Fresnel Lenses structure of light incident, being concentrated on the focus and the focal length that form on the center line is F.Wherein, this Fresnel Lenses structure has one and is the second Fresnel Lenses structure of reflector space for the first Fresnel Lenses structure of index ellipsoid and.

The first Fresnel Lenses structure is a plurality of first phacoiies of arranging in regular turn along having on first fundamental plane, outwards being counted by center line is i, the exiting surface of first fundamental plane and lens body is T apart, the first adjacent phacoid is then at a distance of being p, first phacoid and first fundamental plane extend to form first angle [alpha] _i, this angle satisfies following equation:

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

The second Fresnel Lenses structure then is connected with the first Fresnel Lenses structure, the second Fresnel Lenses structure has a plurality of second phacoiies of arranging in regular turn, is j by center line to the outer rim counting, adjacent second phacoid has spacing p apart, each second phacoid is defined as second fundamental plane along the vertical direction that the center line with lens arrangement extends, and the exiting surface of second fundamental plane and lens body is T apart _j, this is a variable, by design, makes incident light pass through second phacoid and forms an emergent light, forms second angle [alpha] with exiting surface _j, second angle satisfies following equation:

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

The beneficial effect of combined concentration device of the present invention is that according to the design of each parameter, the combined concentration device is formed with the design of index ellipsoid and reflector space, can shorten the distance that arrives focus through this combined concentration device, effectively increases optically focused.

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

Description of drawings

Fig. 1 is the Fresnel Lenses structural representation of prior art;

Fig. 2 is the Fresnel Lenses structure optically focused synoptic diagram of prior art;

Fig. 3 is the schematic top plan view of combined concentration device first embodiment of the present invention;

Fig. 4 is side-looking and its optically focused synoptic diagram of combined concentration device 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 combined concentration device;

Fig. 7 is the reflector space structure angular relationship figure of combined concentration device of the present invention;

Fig. 8 is the reflector space structure angular relationship of combined concentration device of the present invention and prior art;

Fig. 9 is side-looking and its optically focused synoptic diagram of combined concentration device second embodiment of the present invention;

Figure 10 is side-looking and its optically focused synoptic diagram of combined concentration device the 3rd embodiment of the present invention;

Figure 11 is the opticpath synoptic diagram of combined concentration device second embodiment of the present invention;

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

Wherein, description of reference numerals is as follows:

Lens body 10 Fresnel Lenses 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

The first phacoid rake angle α, 1 second phacoid rake angle α 2

Optical collector 40,92,12 beam angle β

The incidence surface rake angle γ first beam angle β 1

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

First fundamental plane, 60 second fundamental planes 70

Light 41,11 incidence surfaces 31

J of exiting surface 32 counting

Embodiment

The present invention proposes a kind of combined concentration device, uses the architectural feature of Fresnel Lenses (Fresnel lens) especially, by optical design, forms and shortens focal length and increase optically focused.

The side view of the schematic top plan view of reference combined concentration device of the present invention shown in Figure 3 and the combined concentration device of Fig. 4.Fig. 3 illustrates that a Fresnel Lenses of combined concentration 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 a plurality of zigzag lens phacoiies on the lens body 30 of combined concentration device for this reason, can and the side view of the corresponding diagram 4 combined concentration device embodiment shown in showing, this embodiment distinguishes with explanation two zones, the Fresnel Lenses of inner round portion is shown as the index ellipsoid 301 (the first Fresnel Lenses structure) with identical lens body thickness, and having phacoid thickness inequality near the part of this concentric circles outer rim then is reflector space 303 (the second Fresnel Lenses structure).

The synoptic diagram of being advanced by combined concentration device shown in Figure 4 and its light as can be known, this combined concentration device comprises an incidence surface 31 and an exiting surface 32, this exiting surface 32 comprises the Fresnel Lenses structure of above-mentioned two kinds of forms, forms a side that is arranged at same level.The structure of this combined concentration 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, so 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 phacoid rake angle tangent value (tan α) gradually, 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 Lenses structure of index ellipsoid 301 shown in Figure 4 has identical thickness T, as Fresnel Lenses 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 the unirefringence mode.Wherein, the second Fresnel Lenses structure on the reflector space 303 then designs different structural thickness T, form phacoid rake angle α, after this light 41 passes lens, pass through primary event and unirefringence and penetrate focusing, wherein, go up a total reflection of formation in the zigzag oblique angle of each phacoid face (rake angle α), carry out another time refraction through lens body surfaces afterwards, light 41 promptly is refracted and focuses on the optical collector 40.

The depth-to-width ratio curve map of the present invention shown in Figure 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 the phacoid width, F# is represented as different design focal lengths (F), and the 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 among the 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, being represented as the lens depth-to-width ratio, is that reference frame changes thickness (T) with transverse axis F# and longitudinal axis depth-to-width ratio, 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 combined concentration device shown in Figure 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 that the tangent value of rake angle α is less, the design of α angle just is less and obtain less F# value, and the combined concentration apparatus structure that makes Fig. 4 show can be collected more light focusing.

Figure 6 shows that the index ellipsoid angular relationship figure of combined concentration device, illustrate the part phacoid structure of index ellipsoid, wherein the focal length of whole lens is F, one first fundamental plane 60 of the first Fresnel Lenses organization definition horizontal direction in the index ellipsoid, on first fundamental plane 60, be formed with a plurality of first phacoiies, first phacoid is counted in regular turn to outer rim (both sides) by the center line of overall lens and is i, the exiting surface upper limb of each phacoid and first fundamental plane 60 have a fixed range T (just bottom ramp structure upper limb is to incidence surface thickness), and each phacoid structural thickness is the fixed sturcture thickness t in this zone ₀And adjacent two first phacoiies have a spacing p apart, so each the whole lens center of phacoid distance distance is ip.

In this example, first phacoid and first fundamental plane 60 extend to form the first angle (α _i), just, light is entered by incidence surface 31, has the first angle (α through phacoid one end _i) ramp structure refraction and go out.Has the first angle (α through this _i) the light of ramp structure refraction, defining a beam angle β is the angle of the direct of travel of incident ray and refracted ray, and following relationship and derivation are arranged between α and the β:

n?sinα＝sin(α+β)--------(1)

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

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

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

Wherein

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

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

First angle (the α herein _i) satisfy following equation (7):

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

According to shown in Figure 6, the index ellipsoid 301 and reflector space 303 of parameter F # decision Fresnel Lenses under the situation such as F# 〉=0.5, define index ellipsoid 301.The thickness T of 60 of the exiting surface 32 and first fundamental planes is constant in the index ellipsoid 301, and in reflector space 303, design changes thickness.

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

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

β＝90-sin ^-1[n?sin(2α-90)]--------(8)

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

Known $F\#=\frac{F-T_j}{2\mathrm{jp}}---\left(10\right)$

Second angle [alpha] _jSatisfy following equation (11):

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

According to the foregoing description, utilize parameter F # to define reflector space, under the situation such as F#＜0.5, define this reflector space.

Shown in Figure 7, exiting surface 32 upper limbs of second fundamental plane 70 and second phacoid apart be a variable apart from T, be a plurality of phacoiies in the second Fresnel Lenses structure of reflector space with different-thickness, structure reaches preferable 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 the 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, show among the figure that incident light 11 enters lens 30, the triangle of top is shown as phacoid 30 structures that prior art has phacoid rake angle α 1, light 11 enters the Fresnel Lenses body after reflection, go out in side refraction again, to form optic angle β 1; The below then 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 refraction of Fresnel Lenses body one side, the lens thickness difference of the phacoid of prior art and the technology of the present invention is d, is following formula (12) to obtain phacoid depth-to-width ratio difference:

$\tan \mathrm{\α}1-\tan \mathrm{\α}2\≅\left|\frac{T-d}{p}\right|=\frac{1}{p}\left[\right|T-\frac{\mathrm{jp}}{2}|\frac{1}{\tan \mathrm{\β}1}-\frac{1}{\tan \mathrm{\β}2}|\left|\right]---\left(12\right)$

Wherein, if with identical each phacoid numbering j and each phacoid width p is example, the present invention use have less phacoid rake angle α, the phacoid of less depth-to-width ratio (tan α), bigger beam angle β, to produce preferable spotlight effect, with short focal length.

In order to reach the purpose of short focal length of combined concentration device of the present invention and preferable optically focused, another forms the zigzag lens arrangement on the incidence surface 31 of lens body embodiment is also proposed, by revising the deviation angle of incident light, reach the benefit of littler Fresnel Lenses body rake angle, littler depth-to-width ratio and shorter focal length.

Please refer to the side view of second embodiment of the invention shown in Figure 9, the lens body 30 of the combined concentration device that the present invention proposes can be divided into incidence surface 31 and the exiting surface 32 that receives light 11, each Fresnel Lenses structure is to be positioned at exiting surface 32, to form an effect that focuses on, zigzag lens arrangement among this embodiment then is to place on the incidence surface 31 of body 30, to change the angle that Fresnel Lenses body thickness (T) and incident light enter lens body 30.

Fig. 9 as can be known, lens body 30 incidence surfaces 31 have a printing opacity laciniation 90 with a thickness T, if by from shown in the vertical view, this laciniation 90 is a concentric circles or similar lens arrangement, because changed the angle that light enters, must influence the Fresnel Lenses structure Design 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 of exiting surface 32 reflector spaces tops, therefore, still can produce the effect of total reflection for each phacoid that will reach Fresnel lens arrangement in the reflector space 303, so should revise each phacoid rake angle α, changed the position (optical collector 92) that focuses on simultaneously, just focal length F is shorter.

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

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

$\mathrm{\β}=90-{\sin }^{-1}\left(n\sin \right[2(\mathrm{\α}+\mathrm{\γ}-\frac{\sin \mathrm{\γ}}{n})-90\left]\right)---\left(\text{13}\right)$

Known tan β=jp/ (F-t ₀).

Lens oblique angle α _jSatisfy following equation:

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

F#=(F-T wherein ₀)/2jp.

The zigzag lens arrangement produces below Fresnel Lenses structural modifications 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#, is defined as F#=(F-T)/2jp, and 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 the phacoid width.

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

In sum, the present invention is a Fresnel Lenses structure of using prior art, propose a kind of combined concentration device with shorter focal length, thinner and better optically focused, the Fresnel Lenses body thickness changes the light deflection angle, obtains the effect of shorter focal length and better optically focused.

Only the above only be a preferable possible embodiments of the present invention, and is non-so promptly limit to claim of the present invention, so the equivalent structure variation of using instructions of the present invention and diagramatic content to do such as all in like manner is contained in the scope of the present invention, closes and gives Chen Ming.

Claims (16)

1. combined concentration device is characterized in that described device includes:

One body, has 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 Lenses structure, when projection one incident light is organized Fresnel Lenses structure by this, be formed with a focus on a center line of this group Fresnel Lenses structure, this focus and this incidence surface are at a distance of a focal length F, and this group Fresnel Lenses structure has:

One first Fresnel Lenses structure, it is along having a plurality of first phacoiies of arranging in regular turn on one first fundamental plane, and count i this first phacoid to both sides with this center line, this first fundamental plane and this exiting surface upper limb are at a distance of a fixed range T, adjacent two these first phacoiies have a spacing p apart, and this first phacoid and this first fundamental plane extend to form one first angle [alpha] _i, this first angle satisfies following equation:

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

One second Fresnel Lenses structure, it is connected with this first Fresnel Lenses structure, this second Fresnel Lenses structure has a plurality of second phacoiies of arranging in regular turn, 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 satisfies following equation:

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

2. combined concentration device as claimed in claim 1 is characterized in that the described first Fresnel Lenses structure is the index ellipsoid of a same thickness.

3. combined concentration device as claimed in claim 2 is characterized in that, in the equation that satisfies this first angle, defines the scope of this index ellipsoid by parameter (F-T)/(2ip).

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

5. combined concentration device as claimed in claim 1 is characterized in that the described second Fresnel Lenses structure is the reflector space of a thickness inequality.

6. combined concentration device as claimed in claim 5 is characterized in that, in the equation that satisfies described second angle, by parameter (F-T _j)/(2jp) defines the scope of this reflector space.

7. combined concentration device as claimed in claim 6 is characterized in that, if described parameter (F-T _j)/(2jp) then is defined as this reflector space less than 0.5.

8. combined concentration device is characterized in that described device includes:

One body, has 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 Lenses structure, when projection one incident light is organized Fresnel Lenses structure by this, be formed with a focus on a center line of this group Fresnel Lenses structure, this focus and this incidence surface are at a distance of a focal length F, and this group Fresnel Lenses structure has:

One first Fresnel Lenses structure, it is along having a plurality of first phacoiies of arranging in regular turn on one first fundamental plane, and count i this first phacoid to both sides with this center line, this first fundamental plane and this exiting surface upper limb are at a distance of a fixed range T, adjacent two these first phacoiies have a spacing p apart, and this first phacoid and this first fundamental plane extend to form one first angle [alpha] _i, this first angle satisfies following equation:

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

One second Fresnel Lenses structure, it is connected with this first Fresnel Lenses structure, this second Fresnel Lenses structure has a plurality of second phacoiies of arranging in regular turn, 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 satisfies following equation:

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

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

9. combined concentration device as claimed in claim 8 is characterized in that the described first Fresnel Lenses structure is the index ellipsoid of a same thickness.

10. combined concentration device as claimed in claim 8 is characterized in that, in the equation that satisfies described first angle, defines the scope of this index ellipsoid by parameter (F-T)/(2ip).

11. combined concentration device as claimed in claim 10 is characterized in that, if described parameter (F-T)/(2ip) more than or equal to 0.5, then is defined as this index ellipsoid.

12. combined concentration device as claimed in claim 8 is characterized in that the described second Fresnel Lenses structure is the reflector space of a thickness inequality.

13. combined concentration device as claimed in claim 8 is characterized in that, in the equation that satisfies described second angle, by parameter (F-T _j)/(2jp) defines the scope of this reflector space.

14. combined concentration device as claimed in claim 13 is characterized in that, if described parameter (F-T _j)/(2jp) then is defined as this reflector space less than 0.5.

15. combined concentration device as claimed in claim 8 is characterized in that the rake angle γ of described laciniation satisfying following equation:

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

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

16. combined concentration device as claimed in claim 15 is characterized in that described laciniation is a concentrically ringed lens arrangement.

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