CN103278917A

CN103278917A - Fresnel lens system with variable focuses

Info

Publication number: CN103278917A
Application number: CN 201310228638
Authority: CN
Inventors: 盖志武
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-06-09
Filing date: 2013-06-09
Publication date: 2013-09-04
Also published as: CN103885163A; CN203930192U

Abstract

A Fresnel lens system with variable focuses can effectively change the focus position of a Fresnel lens after condensation to meet the requirements of the use of the Fresnel lens for condensation and the various requirements for the focus position in engineering. A plane mirror is arranged between the Fresnel lens and the focus of the Fresnel lens, and therefore the direction of light after the condensation of the Fresnel lens is changed due to the reflection of the plane mirror and the focus position is changed after the condensation of the Fresnel lens. The focus position can be changed along with the change of the position and the angle of the plane mirror, and therefore engineering requirements on different sites can be met. The Fresnel lens system with the variable focuses solves the problems that due to the fact that the focus of an existing Fresnel lens is fixed, using on certain sites is inconvenient, efficiency is low, waste is caused, and effective development and full use of solar energy are affected.

Description

Variable-focus Fresnel Lenses system

Technical field

The present invention relates to a kind of variable-focus Fresnel Lenses system, can change the focal position behind the Fresnel Lenses optically focused, to satisfy the requirement of using Fresnel Lenses optically focused and focusing position in the engineering.

Background technology

Fresnel Lenses is widely used in photovoltaic, the photo-thermal system, yet the focus of existing Fresnel Lenses is changeless, this makes troubles for some application scenario even causes inefficiency or waste, has influenced effective exploitation of sun power and takes full advantage of.Develop a kind of variable-focus Fresnel Lenses system to solve this type of problem for this reason.

Summary of the invention

The objective of the invention is to immobilize for the focus that solves existing existing Fresnel Lenses, make troubles for some application scenario even cause inefficiency or waste, influence is to effective exploitation of sun power and the problem that takes full advantage of.

Between Fresnel Lenses and its focus, level crossing is set, because the reflection of level crossing, changed the radiation direction behind the Fresnel Lenses optically focused, focal position behind the Fresnel Lenses optically focused is changed, change position and the angle of level crossing, the focal position is corresponding change also, to satisfy the requirement of engineering of different occasions.

The invention has the beneficial effects as follows:

Can change or regulate the focal position behind the Fresnel Lenses optically focused, to satisfy the various requirement that uses Fresnel Lenses optically focused and focusing position in the engineering, effectively improve the development and utilization effect to sun power.

Description of drawings

Fig. 1 represents first kind of synoptic diagram that the embodiment level crossing is vertical with normal of the present invention.

Fig. 2 represents second kind of embodiment level crossing of the present invention and normal acutangulates or the synoptic diagram at obtuse angle.

Embodiment

Embodiment one:

As shown in Figure 1, variable-focus Fresnel Lenses of the present invention system comprises Fresnel Lenses 1, and former focus 3, this variable-focus Fresnel Lenses system also comprise the level crossing 2 parallel with Fresnel Lenses 1, normal 4, the focus 5 after the transfer on the normal; When directional light along being parallel to the direction of normal 4, after Fresnel Lenses 1 top vertical incidence, because the reflection of level crossing 2, make focus behind Fresnel Lenses 1 optically focused become the focus 5 after the transfer on the normal on the normal 4, rather than former focus 3.

Embodiment two:

As shown in Figure 1, in variable-focus Fresnel Lenses of the present invention system, when level crossing 2 when sliding perpendicular to the direction of normal 4, the focus 5 after the transfer on the normal is also slided at normal 4; Focus 5 sliding scales after the transfer are between former focus 3 and Fresnel Lenses 1.

Embodiment three:

As shown in Figure 2, the focus 6 after variable-focus Fresnel Lenses of the present invention system also comprises the transfer of off-normal.Level crossing 2 acutangulates with normal 4 or during the obtuse angle, because the reflection of level crossing 2, makes focus behind Fresnel Lenses 1 optically focused be become the focus 6 after the transfer of off-normal by former focus 3; Focus 6 off-normal 4 after the transfer of off-normal, concrete side-play amount is relevant with position and the angle of level crossing 2.

Variable-focus Fresnel Lenses of the present invention system adopts the focal position after simple and level crossing that cost is cheap changes fourth Fresnel Lenses optically focused, can satisfy the requirement of engineering of different occasions, effectively improve the development and utilization effect to sun power, expand the application space of sun power.

Claims

1. a variable-focus Fresnel Lenses system comprises Fresnel Lenses (1), and former focus (3) is characterized in that this variable-focus Fresnel Lenses system also comprises level crossing (2), normal (4), the focus after the transfer on the normal (5); Level crossing (2) is parallel with Fresnel Lenses (1), the direction that is parallel to normal (4) when the directional light edge, after the vertical incidence of Fresnel Lenses (1) top, because the reflection of level crossing (2), make focus behind Fresnel Lenses (1) optically focused become the focus (5) after the transfer on the normal on the normal (4).

2. variable-focus Fresnel Lenses according to claim 1 system is characterized in that level crossing (2) when sliding perpendicular to the direction of normal (4), and the focus after the transfer on the normal (5) is also slided at normal (4).

3. variable-focus Fresnel Lenses according to claim 1 system is characterized in that the focus (6) after this system also comprises the transfer of off-normal; Level crossing (2) and normal (4) acutangulate or during the obtuse angle, because the reflection of level crossing (2), make focus behind Fresnel Lenses (1) optically focused be become the focus (6) after the transfer of off-normal by former focus (3).