CN202720345U

CN202720345U - Composite fresnel lens

Info

Publication number: CN202720345U
Application number: CN 201220456109
Authority: CN
Inventors: 鲁健东; 鲁帝
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-09-10
Filing date: 2012-09-10
Publication date: 2013-02-06
Anticipated expiration: 2022-09-10

Abstract

The utility model provides a composite Fresnel lens, belonging to the technical field of Fresnel Lenses, wherein the composite Fresnel lens is formed by a Fresnel lens combination comprising two or more coaxial Fresnel lenses, the center portion of the incident surface of the composite Fresnel lens is provided with a common Fresnel lens, and the portion except the center portion is provided with an annular focusing Fresnel lens. The composite Fresnel lens can independently enable light beams to uniformly focus and diffuse without the combined effect of other optical components (such as a secondary light condenser, etc.), thereby reducing light intensity loss caused by the reflection of the surface of optical components in the process of light beam transmission, and being helpful for reducing construction and maintenance cost of a light uniformly-focusing or diffusing system.

Description

Composite Fresnel lens

Technical field

The utility model relates to a kind of composite Fresnel lens, belongs to the Fresnel Lenses technical field.

Background technology

In many application, such as the luminous intensity distribution of sun power utilization and LED pointolite etc., all need light beam done and evenly converge or spread, common method is to use the secondary optics element at present.As namely being first by Fresnel Lenses optically focused in photovoltaic generation, and then use the secondary condensation device evenly to converge light.Some problems that these methods exist have, as because the use of secondary optics element, must cause that the whole system cost rises, resetting difficulty strengthens and the converging beam conductive process in energy loss increase etc.Although some researchs are also arranged at present to be wished and can realize evenly converging of light beam or spread by an optically focused; but mostly exist such as design complicated; some problems such as requirement on machining accuracy is high, difficulty is large, cost is high, intensity loss is more are unfavorable for large-scale production and application.

Summary of the invention

The purpose of this utility model is to provide a kind of composite Fresnel lens, to solve the problem that existing difficulty of processing is large, high in cost of production is unfavorable for application in practice in existing evenly poly-(faling apart) light scheme.

The purpose of this utility model is achieved through the following technical solutions:

A kind of composite Fresnel lens is comprised of two or more coaxial Fresnel Lenses.Wherein the lens center section is common Fresnel Lenses, and the part beyond the center section focuses on Fresnel Lenses for ring.

Device described in the utility model can be realized evenly converging and spreading of light beam need not other optical element independent in the coefficient situation such as (such as the secondary condensation device), reduced in the beam Propagation process because the intensity loss that optical element surface reflection etc. cause is conducive to reduce construction and the maintenance cost that evenly gathers (faling apart) photosystem.

In addition, the what is called in the utility model application " uniform condensing " refers to: according to the homogeneity expression formula (1) that the spot intensity of IEC60904-9 international standard regulation distributes, it is that light distribution 100% is evenly the time that the hot spot equalization of intensity is not less than 36.8%( Wherein

Be natural constant,

).

Description of drawings

Fig. 1 is the structural representation of a kind of composite Fresnel lens of the utility model;

Fig. 2 is principle schematic of the present utility model.Reference numeral 5 among Fig. 2 is that each regional focal beam spot focal position curved surface of the composite Fresnel lens plane of incidence (is referred to as design surface in the present patent application, and this design surface can be plane, curved surface or folding face---every height face of this folding face can be again plane or curved surface), the 6th, solar energy conversion device.O among the figure is composite Fresnel lens plane of incidence Central Symmetry point; B ', A ', each regional focal position of the O ' expression plane of incidence; On IB ' among the figure, IA ', the IO ' expression design surface respectively corresponding to B ', A ', O ' focal beam spot peak light intensity.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail: the present embodiment is implemented under take technical solutions of the utility model as prerequisite, has provided detailed embodiment, but protection domain of the present utility model is not limited to following embodiment.

As shown in Figure 1, a kind of composite Fresnel lens that the present embodiment is related, comprise: the lens plane of incidence 1, the described lens plane of incidence 1 comprises lens area 1, lens area 23 and lens area 34, lens area 1 is arranged on the inboard of lens area 23, and lens area 34 is arranged on the outside of lens area 23.

Described lens area 1 is common Fresnel Lenses.

Described lens area 23 and lens area 34 are ring and focus on Fresnel Lenses.

Described lens can use separately, or are divided into the polylith use, or a plurality of lens combination uses.

On macroscopic view, the profile of the described composite Fresnel lens of the present embodiment can be plane (or curved surface or folding face---every height face of folding face can be again plane or curved surface etc.).A kind of simple situation as shown in Figure 1.Be without loss of generality, the discussion below us is take situation shown in Figure 1 as example.

The described composite Fresnel lens of the present embodiment is coaxial-symmetrical multi_region face, as shown in fig. 1 the zone one, the zone two and the zone three, and in design, require each zone that the light beam of incident on it focused on a certain ad-hoc location in space, this position can be positioned at before the solar energy conversion device surface, also can be positioned at after the solar energy conversion device surface or on (referring to Fig. 2.The definite of this ad-hoc location and each regional extent of the plane of incidence will be finished by optimized algorithm.Because optimizing process is content known in this field, therefore optimized algorithm is not done discussing in detail and illustrating).Wherein, 1. plane of incidence central area (namely as shown in Figure 2 zone one) is common Fresnel Lenses, and it focuses on the light beam of incident on it a bit, and we claim this focal beam spot to be " some shaped laser spot "; 2. for ring focuses on Fresnel Lenses, they are focused into the light beam on these zones of incident respectively ring in other zone around (namely as shown in Figure 2 zone two and zone three), and we claim these focusing rings to be " ring-type hot spot ".

For Fresnel Lenses, because its " some shaped laser spot " and " ring-type hot spot " all presents that the center is strong, " Gauss " type hot spot pattern a little less than the edge.Thus, if these hot spots mutually " suitably " overlappingly (be equivalent to the focal position of determining each regional light beam of the plane of incidence.As previously mentioned, this task can be finished by optimized algorithm), then can so that total light distribution of the lip-deep converging beam of solar energy conversion device is tending towards close everywhere, namely realize the purpose of evenly poly-(faling apart) light.

The above; it only is one of better embodiment of the utility model; these embodiments all are based on the different implementations under the utility model general idea; and protection domain of the present utility model is not limited to this; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the variation that can expect easily or replacement all should be encompassed within the protection domain of the present utility model.Therefore, protection domain of the present utility model should be as the criterion with the protection domain of claims.

Claims

1. a composite Fresnel lens is characterized in that, is comprised of two or more coaxial Fresnel Lenses, and wherein the lens center section is common Fresnel Lenses, and the part beyond the center section focuses on Fresnel Lenses for ring.

2. composite Fresnel lens according to claim 1 is characterized in that, the profile of described lens is plane, curved surface or folding face.

3. composite Fresnel lens according to claim 2 is characterized in that, every height face of described folding face is plane or curved surface.

4. composite Fresnel lens according to claim 2 is characterized in that, described lens can use separately, or is divided into the polylith use, or a plurality of lens combination uses.