KR100933213B1 - Condensing Lens for Solar Power Generation - Google Patents

Abstract

PURPOSE: A concentration lens for solar power generation is provided to collect sunlight on the surface of a solar cell arranged on the side by reflecting a light on a linear focus which is formed by unit condensing lens to a plane of a conic section. CONSTITUTION: A unit condensing lens part(10) focus the sunlight on the surface of the solar battery(20). The unit condensing lens part changes a progressive direction of the sunlight projected from above to a side direction(12). A plurality of unit condensing lenses having a round-shape are formed in longitudinal direction, and a optical focus of a conic section is focused on a plurality of unit grooves formed on a lens axis of the unit condensing lens. The sunlight is projected on the unit condensing lens is reflected from a unit groove of a conic section shape.

Description

Condensing lens for photovoltaic power generation {CONCENTRATION LENS FOR SOLAR POWER GENERATION}

The present invention relates to a light collecting lens for photovoltaic power generation.

In general, a photovoltaic power generation facility refers to a device that converts light energy of the sun into electrical energy using a solar cell. In this case, the solar cell is composed of a PN junction semiconductor to induce electricity by generating free electrons when irradiated with sunlight.

A condensing photovoltaic power generation facility uses a condenser that concentrates sunlight and irradiates the surface of a solar cell. The light intensity of the light concentrating device is directly related to the energy efficiency of the power generation equipment and is proportional to the area of the light condensing lens installed in front of the solar cell.

In general, solar concentrating optics includes a point-focus dish type, a linear-focus trough type, and a point-focus Fresnel lens type. , Linear-focus Fresnel lens type, and heliostat type device, and other types such as RXI, TIR type (type). However, the above-described type of solar concentrating optical device has a problem in that a solar cell is positioned at a predetermined distance from a lens or a reflector, so that a certain distance must be secured between the lens and the solar cell.

In addition, in order to increase the amount of power generation of the solar power generation facilities, it is inevitable to increase the size of the solar cell and the condenser lens structure. However, since the conventional condensing lens is manufactured in a large size, a lot of constraints are generated in terms of cost and structure, and thus, it is very difficult to expect an improvement in energy efficiency through enlargement in designing the condenser.

On the other hand, an organic photovoltaic condenser lens that condenses light to the side by using the scattering characteristics of the organic material has been devised (High-Efficiency Organic Solar Concentrators for Photovoltaics, Michael et al., 2008, Science, Vol. 321, pp. 226-228). However, in the case of the organic solar light collecting lens, in order to focus light on the side, there is a problem that an expensive organic material must be used.

Therefore, in order to solve the above problems, the present invention, unlike the conventional method for condensing the sunlight on the rear portion away from the condenser lens by a predetermined distance or more, the solar cell at the side of the lens to focus the sunlight on the side of the condenser lens To provide a light collecting lens for photovoltaic power generation that can significantly reduce the volume and weight of the solar light collecting device.

In addition, the present invention, in order to condense by the solar cell provided in the side portion, the unit condensing lens unit and the unit groove are formed on the upper surface and the lower surface, respectively, the light collected at the linear focus formed by the unit condensing lens unit conical curved surface It is an object of the present invention to provide a light collecting lens for photovoltaic power generation that is reflected by the light, which is efficiently focused on the surface of the solar cell provided on the side.

In addition, according to the present invention, the condensing lens of the upper and lower layers is formed of a material having a different refractive index, so that the light reflected by the conical curved surface of the unit groove of the second condensing lens portion does not fly into the air, but the first condensing lens portion It is an object of the present invention to provide a condensing lens for photovoltaic power generation to reflect the second condensing lens portion in contact with the solar cell.

In addition, the present invention, when designing a large solar light concentrating device, by reducing the volume of the device to secure an installation space, it is possible to reduce the installation cost, and to provide a solar power condensing lens that can improve energy efficiency Its purpose is to provide.

The photovoltaic condensing lens of the invention according to claim 1 is a condensing lens provided with a solar cell on a side surface and condenses solar light on a surface of the solar cell, and has a unit condensing lens portion having a convex round cross section on an upper surface thereof. A plurality of unit grooves are formed in a direction, one surface of which is formed in a direction such that refracted sunlight does not enter, and the other surface of which has a unit groove formed in a conical curved shape on the lens axis of the unit condensing lens portion. A plurality of conical curved optical focal points are formed at the convex shape, and the sunlight incident on the unit condensing lens part is reflected on the surface formed in the conical curved portion of the unit groove and condensed on the surface of the solar cell.

Therefore, according to the solar light condensing lens of the invention according to claim 1, a solar cell is provided on the side surface of the light condensing lens and a light condensing lens for condensing with the solar cell is used. The volume and weight of the solar light collecting device can be significantly reduced than in the case of installation. In addition, in order to condense the solar cell installed in the side part, the unit condensing lens unit and the unit groove are formed on the upper and lower surfaces, respectively, and the light collected at the linear focus formed by the unit condensing lens unit is reflected on the surface formed in the shape of a conical curve. Therefore, the light is efficiently condensed on the surface of the solar cell provided on the side surface.

In the solar power condensing lens of the invention according to claim 2, in the solar light condensing lens of the invention according to claim 1, a predetermined reflecting material is coated on a surface formed in a conical curved shape of the entire lower surface or a unit groove.

Therefore, according to the solar light condensing lens of the invention according to claim 2, the incident light is reflected on the entire surface of the condensing lens or the surface formed in the conical curve of the unit groove to reflect incident sunlight toward the solar cell of the condensing lens. Therefore, the reflectance toward the solar cell can be improved.

The photovoltaic condensing lens of the invention according to claim 3 is a condensing lens provided with a solar cell on a side surface and condenses solar light on a surface of the solar cell, and a unit condensing lens portion having a round cross section convex on an upper surface thereof in a longitudinal direction. The first condensing lens portion, and the lower surface is formed in a plurality, the refractive index is larger than the refractive index of the first condensing lens portion, and the upper surface is formed flat so as to be laminated with the lower surface of the first condensing lens portion, One side is formed in a direction to prevent refracted sunlight from entering, and the other side is a conical curved unit groove so that the optical focus of the conical shape is placed on the lens axis of the unit condensing lens unit. It includes a plurality of second condensing lens portion formed, the sunlight incident on the unit condensing lens portion is due to the surface formed in the conical curve of the unit groove Is reflected, directly or condensed onto the surface of the solar cell, it is totally reflected between the second upper and lower parts of the condenser lens and is focused onto the surface of the solar cell.

Therefore, according to the photovoltaic condensing lens of the invention according to claim 3, since the first condensing lens portion and the second condensing lens portion are formed of materials having different refractive indices, they are formed in the shape of a conical curve of the unit groove of the second condensing lens portion. The light reflected by the surface does not fly into the air, but is reflected on the surface where the first condensing lens portion and the second condensing lens portion are in contact with each other to be focused by the solar cell. In addition, since a solar cell is installed at the side of the condenser lens and a condenser lens is used to condense the solar cell, the volume and weight of the solar concentrator is remarkable compared to the case where the solar cell is installed below the condenser lens. Can be reduced.

The solar power condensing lens of the invention according to claim 4 is the solar light condensing lens of the invention according to claim 3, wherein the second condensing lens unit has a predetermined reflective material on a surface formed in a conical curved shape on the entire lower surface or on the lower surface. Coated.

Therefore, according to the photovoltaic condensing lens of the invention according to claim 4, the reflectance in the lateral direction can be improved by coating a predetermined reflecting material on a surface formed in a conical curve shape on the entire lower surface or the lower surface thereof.

The photovoltaic condensing lens of the invention according to claim 5 is a condensing lens provided with a solar cell on a side surface and condenses solar light on a surface of the solar cell, and has a unit condensing lens portion having a convex round cross section on its lower surface. A plurality of unit grooves are formed in a direction, one surface is formed in a direction such that refracted sunlight is not incident on the upper surface, and the other surface is formed in a conical curved shape on the lens axis of the unit condensing lens portion. A plurality of conical curved optical focal points are formed on the photoconductor, and sunlight incident on the upper surface is sequentially reflected on the surface of the unit condensing lens unit and the conical curved surface of the unit groove and condensed on the surface of the solar cell.

Therefore, according to the solar light condensing lens of the invention according to claim 5, since the solar cell is provided at the side surface of the lens so that the solar light is focused on the side of the condensing lens, the volume and weight of the solar light concentrating device can be minimized. . In addition, the unit condensing lens unit and the unit groove are formed on the lower surface and the upper surface, respectively, and the light collected at the linear focus formed by the unit condensing lens unit is directed to the surface of the solar cell installed on the side of the condensing lens through the surface formed in the conical curve shape. The light can be efficiently collected.

In the solar power condensing lens of the invention according to claim 6, in the solar light condensing lens of the invention according to claim 5, a predetermined reflecting material is coated on the surface of the unit condensing lens portion or the surface formed in the shape of a conical curve.

Therefore, according to the solar light condensing lens of the invention according to claim 6, it is possible to improve a reflectance in the lateral direction by coating a predetermined reflecting material on the surface of the unit condensing lens portion or the surface formed in the shape of a conical curve.

The photovoltaic condensing lens of the invention according to claim 7 is a condensing lens provided with a solar cell on a side thereof and condenses solar light on a surface of the solar cell, and a unit condensing lens portion having a round cross section convex on its lower surface in a longitudinal direction. And a refractive index greater than the refractive index of the first condensing lens portion, and the first condensing lens portion, the plurality of which are formed in a plurality, and the upper surface is flat, and the lower surface is formed flat so as to be laminated with the upper surface of the first condensing lens portion, One side is formed in a direction that prevents refracted sunlight from entering, and the other side is a conical curved unit groove so that the optical focus of the conical curve is placed on the lens axis of the unit condensing lens unit. And a plurality of second condensing lens parts formed, and the sunlight incident on the upper surface of the second condensing lens part is a unit condensing lens part of the first condensing lens part; Is reflected in turn in the plane formed by the conic shape of the above groove, or directly condensed at the surface of the solar cell, it is totally reflected between the upper and lower parts of the condenser lens 2 is converged to the surface of the solar cell.

Therefore, according to the solar condensing lens of the invention according to claim 7, since the first condensing lens portion and the second condensing lens portion are formed of materials having different refractive indices, the condensing magnification can be increased through total reflection. In addition, since the solar cell is installed at the side surface of the lens to collect the sunlight to the side of the condenser lens, it is possible to minimize the volume and weight of the solar condenser.

In the solar power condensing lens of the invention according to claim 8, in the solar light condensing lens of the invention according to claim 7, a predetermined reflective material is coated on the surface of the unit condensing lens unit and a surface formed in a conical curve shape.

Therefore, according to the photovoltaic condensing lens of the invention according to claim 8, the reflectance in the lateral direction can be improved by coating a predetermined reflecting material on the surface of the unit condensing lens portion or the surface formed in the shape of a conical curve.

As described above, according to the present invention, unlike the conventional method of condensing sunlight on the rear portion away from the condenser lens by a certain distance, since the solar cell is installed on the side of the lens so that the sunlight is condensed on the side of the condenser lens, The volume and weight of the solar concentrator can be significantly reduced.

In addition, according to the present invention, in order to condense the solar cell provided in the side portion, the unit condensing lens unit and the unit groove are formed on the upper and lower surfaces, respectively, and the light collected at the linear focus formed by the unit condensing lens unit is conical. By reflecting from the surface, it can be efficiently focused on the surface of the solar cell provided on the side.

In addition, according to the present invention, since the condensing lenses of the upper and lower layers are formed of materials having different refractive indices, the light reflected by the conical curved surface of the unit grooves of the second condensing lens portion does not fly into the air but does not fly into the air. The light condensing lens unit and the second light condensing lens unit may be reflected from the contact surface to be focused on the solar cell.

Further, according to the present invention, when designing a large-scale solar light collecting device, the installation space can be reduced by reducing the volume of the device, so that the installation cost can be reduced and the energy efficiency can be improved.

Specific matters other than the problem to be solved, the problem solving means, and the effects of the present invention as described above are included in the following embodiments and the drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. Like reference numerals refer to like elements throughout.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the accompanying drawings are only described in order to more easily disclose the contents of the present invention, but the scope of the present invention is not limited to the scope of the accompanying drawings that will be readily available to those of ordinary skill in the art. You will know.

1 is a perspective view showing the structure of a condenser lens for photovoltaic power generation according to the present invention.

As shown in FIG. 1, the condensing lens 10 for photovoltaic power generation according to the present invention includes a solar cell 20 on a side surface of the condenser lens for condensing sunlight on a surface of the solar cell 20. to be. That is, the condensing lens according to the present invention is a side concentration lens for solar power generation used in a solar light concentrating device.

The condensing lens 10 changes the advancing direction of the sunlight 11, which is the direct sunlight incident on the image surface, to the side surface 12 to condense the surface of the solar cell 20 provided on the side surface. Here, by installing the solar cell 20 on the side of the condenser lens 10, the volume occupied by the solar concentrator is significantly reduced, compared to the conventional method of condensing sunlight on the rear part away from the condenser lens by a predetermined distance or more. It becomes possible. In addition, the structure of the condensing lens 10 capable of changing the traveling direction of sunlight to the side will be described in detail with reference to FIGS. 2 to 5.

Hereinafter, in the embodiment of the present invention, a technique for mounting a tracking device on the outside of the condenser lens and automatically adjusting the orientation angle of the condenser lens according to the change of position of the sun can be easily implemented by those skilled in the art. Since it corresponds to the description, a description thereof will be omitted. Therefore, the structure of the condenser lens will be described on the assumption that the sunlight incident on the image plane of the condenser lens is direct sunlight. In addition, it is assumed that the refractive index of the material used as the condensing lens is constant with respect to sunlight incident on the condensing lens, and a change in the characteristic of light according to each wavelength will be omitted.

2 is a cross-sectional view showing the structure of a light collecting lens for photovoltaic power generation according to the first embodiment of the present invention.

As shown in FIG. 2, in the solar power condensing lens 100 according to the first embodiment of the present invention, a plurality of unit condensing lens units 110 having a convex round cross section is formed on an upper surface thereof. The unit grooves 120 are formed at predetermined positions corresponding to the unit condensing lens unit 110 on the lower surface thereof.

In the condensing lens 100, a plurality of unit condensing lens units 110 having a convex round cross section is formed in the longitudinal direction. Here, sunlight is incident 111 perpendicularly to the upper surface of the unit condensing lens unit. In addition, the condenser lens 100 has one surface 121 formed on a lower surface thereof in a direction such that refracted sunlight does not enter, and the other surface 122 has a concave curved unit groove ( 120) is formed. Here, the unit groove 120 may be formed to a size of a microscopic degree. In addition, a plurality of unit grooves 120 are formed in such a manner that an optical focus F1 having a conical shape is placed on the lens axis of the unit condensing lens unit 110. Therefore, the optical focal line of the unit condenser lens unit 110 and the optical focal line in the shape of a conical curve coincide within a predetermined space. In addition, the sum W1 of the widths of the plurality of unit condensing lens parts 111 may be designed to be 2 to 30 times the width H1 of the solar cell. Here, when the sum W1 of the widths of the plurality of unit condensing lens parts 111 is equal to or less than twice the width H1 of the solar cell, the number of the unit condensing lens parts 111 and the solar cells 130 increases. Therefore, there is a problem in the installation, if more than 30 times, since only a part of the incident sunlight is concentrated on the surface of the solar cell, there is a problem that the energy efficiency is lowered. Therefore, in order to condense all the solar light incident on the condenser lens 100 to the solar cell, the sum W1 of the widths of the plurality of unit condensing lens parts 111 is 2 to 30 times the width H1 of the solar cell. It is preferable to design by ship. For example, a plurality of unit condensing lens units 110 having a width of about 8 mm to about 12 cm may be designed with respect to a solar cell width H1 of about 4 mm.

The sunlight 111 incident on the unit condensing lens unit 110 is collected at the focal point F1 formed by the unit condensing lens unit 110 and reflected on the surface 122 formed in a conical curve shape of the unit groove 120. After that, the light is collected onto the surface of the solar cell 130. In addition, since a predetermined reflecting material is coated on the entire surface of the bottom surface of the condenser lens 110 or the surface 122 formed in the shape of a conical curve of the unit groove 120, the incident sunlight is reflected toward the solar cell of the condenser lens. The reflectance in the lateral direction can be improved. Here, the predetermined reflective material means a metal material having a reflectance of 90% or more, and aluminum, silver, gold, nickel, and the like may be used. In the present invention, it is preferable to use aluminum having a reflectance of 90% or more and being inexpensive as a reflecting material. On the other hand, the conical shape is a generic term for the shape of the cross-section that occurs when the two vertices are in contact with each other, and means a circle, an ellipse, a parabola, and a hyperbolic shape.

Therefore, according to the light condensing lens for solar power generation according to the first embodiment of the present invention, since a solar cell is provided on the side surface of the light condensing lens and the light condensing lens is condensed by the solar cell, It is possible to significantly reduce the volume and weight of the solar light collecting device than when installing solar cells in the solar cell. In addition, in order to condense the solar cell 130 installed in the side portion, the unit focusing lens unit 110 and the unit groove 120 are formed on the upper and lower surfaces, respectively, and the linear focus formed by the unit condensing lens unit 110 is provided. Since the light collected in F1 is reflected on the surface formed in the shape of a conical curve, it is efficiently focused on the surface of the solar cell 130 provided on the side surface.

3 is a cross-sectional view illustrating a structure of a light collecting lens for photovoltaic power generation according to the second embodiment of the present invention.

As shown in FIG. 3, in the solar light condensing lens according to the second embodiment of the present invention, a plurality of unit condensing lens parts 210a having a convex round cross section are formed on an upper surface thereof, and a lower surface 210b of the solar light condensing lens of FIG. The second condensing lens unit 210 and the upper surface 220a, which are formed flat, are formed flat, and the second condensing unit in which the unit grooves 230 are formed at predetermined positions corresponding to the unit condensing lens unit 210a on the lower surface, respectively. The lens unit 220 is formed. FIG. 3 is a structure for reflecting and totally reflecting incident sunlight by varying the refractive indices of the first condensing lens unit 210 and the second condensing lens unit 220 to condense on the surface of the solar cell installed on the side thereof.

In the first condensing lens unit 210, a plurality of unit condensing lens units 210a having a convex round cross section is formed in the longitudinal direction, and a lower surface 210b is formed flat. Here, it is preferable that the sum of the widths W2 of the plurality of unit condensing lens parts 210a is formed to be 2 to 30 times the width H2 of the solar cell 240.

The second condensing lens unit 220 is formed of a material having a refractive index greater than that of the first condensing lens unit 210. In addition, the second condensing lens unit 220 is formed to be flat so that the upper surface 220a is laminated with the lower surface 210b of the first condensing lens unit 210. The second condensing lens unit 220 has one surface 231 formed in a direction such that refracted sunlight does not enter the lower surface 220b, and the other surface 232 has a conical shape. The formed unit groove 230 is formed. Here, the plurality of unit grooves 230 have a size of about microscopic and are formed in plural such that the optical focus F2 in the shape of a conical curve is placed on the lens axis of the unit condensing lens unit 210a. In addition, a predetermined reflective material may be coated on the entire surface 232 of the second condensing lens unit 220 or the surface 232 formed in a conical curve shape of the lower surface. Here, the predetermined reflective material means a metal material having a reflectance of 90% or more, and aluminum, silver, gold, nickel, and the like may be used. In the present invention, it is preferable to use aluminum having a reflectance of 90% or more and being inexpensive as a reflecting material.

The sunlight 211 incident on the unit condensing lens unit 210a is slightly refracted (212, 213) when passing through the first condensing lens unit 210 and the second condensing lens unit 220 having different refractive indices. After gathered at the focal point F2 formed by the condensing lens unit 210a and reflected by the surface 232 formed in the shape of the conical curve of the unit groove 230, the light is collected directly on the surface of the solar cell 240 or the second Total reflection between the upper and lower surfaces of the condenser lens unit 220 is condensed on the surface of the solar cell 240. Here, total reflection refers to a reflection having a light reflectance of 100%, which is a phenomenon in which all of the light is reflected at the interface. Specifically, the total reflection occurs when light is incident at an angle greater than the incident angle (critical angle) when the angle of refraction is 90 degrees when the light is incident from the material having the high refractive index toward the material having the small refractive index. In the present invention, the second condensing lens unit 220 is formed to have a refractive index larger than that of the first condensing lens unit 210, and passes through the first condensing lens unit 210 to allow the second condensing lens unit 220 to be formed. When the light reflected by the surface 232 formed in the shape of a conical curve formed on the lower surface 210b proceeds toward the boundary surface between the first condensing lens portion 210 and the second condensing lens portion 220, Will be totally reflected. At this time, the totally reflected light is directly focused on the solar cell 240 surface. In addition, even when the light totally reflected at the interface between the first condensing lens unit 210 and the second condensing lens unit 220 travels toward the lower surface of the second condensing lens unit 220, the total reflection is again performed on the lower surface in the same principle as above. Will be. Here, since the refractive index of the second condensing lens unit 220 is always higher than the refractive index of the external atmosphere (n = 1), total reflection is made on the interface between the second condensing lens unit 220 and the external atmosphere.

Therefore, according to the condensing lens for solar power generation according to the second embodiment of the present invention, since the first condensing lens unit 210 and the second condensing lens unit 220 are formed of materials having different refractive indices, The light reflected by the surface 232 formed in the conical curve of the unit groove 230 of the condensing lens unit 220 does not fly into the air, but the first condensing lens unit 210 and the second condensing lens unit 220 ) Is reflected on the contact surface to condense to the solar cell 240. In addition, since the solar cell 240 is provided on the side surface of the condenser lens and the condenser lens is used to condense the solar cell 240, the solar condenser is installed more than when the solar cell is provided below the condenser lens. Can significantly reduce the volume and weight of the

4 is a cross-sectional view illustrating a structure of a light collecting lens for solar power generation according to a third embodiment of the present invention.

As shown in FIG. 4, in the solar power condensing lens 300 according to the third embodiment of the present invention, a plurality of unit condensing lens units 310 having a convex round cross section is formed on a lower surface thereof. The unit grooves 320 are formed at predetermined positions corresponding to the unit condensing lens unit 310 on the image surface. FIG. 4 is a modified example of the solar power condenser lens 100 according to the first embodiment of the present invention shown in FIG. 2, and the light transmitted through the upper surface is reflected by the unit condensing lens unit 310 to be unit. The focal point F3 is formed on the lower side of the groove 320, and the light collected at the focal point F3 is focused on the surface of the solar cell 330 installed on the side surface by the surface 322 formed in the shape of a conical curve. to be.

In the condensing lens 300, a plurality of unit condensing lens portions 310 having a convex round cross section is formed in the longitudinal direction. In this case, a predetermined reflective material may be coated on the surface of the unit condenser lens unit 310 and the surface 322 formed in the shape of a conical curve. Here, the predetermined reflective material means a metal material having a reflectance of 90% or more, and aluminum, silver, gold, nickel, and the like may be used. In the present invention, it is preferable to use aluminum having a reflectance of 90% or more and being inexpensive as a reflecting material. The sum W3 of the widths of the plurality of unit condensing lens units 310 is preferably formed to be 2 to 30 times the width H3 of the solar cell. In addition, the condenser lens 300 has one surface 321 formed in a direction such that refracted sunlight does not enter the image surface, and the other surface 322 has a concave curved unit groove ( 320 is formed. Here, the unit groove 320 may be formed to a size of a microscopic degree. In addition, a plurality of unit grooves 320 are formed in such a manner that an optical focus F3 having a conical shape is placed on the lens axis of the unit condensing lens unit 310.

The sunlight 311 incident on the image plane is reflected by the unit condensing lens unit 310, and the reflected light is collected at the focal point F3 formed by the unit condensing lens unit 310, and the collected light is united. After being reflected from the surface 322 formed in the shape of the conical curve of the groove 320, the light is collected onto the surface of the solar cell 330 installed on the side surface.

Therefore, according to the condensing lens 300 for photovoltaic power generation according to the third embodiment of the present invention, the condensing lens 300 is different from the conventional method of condensing sunlight on a rear part away from the condensing lens 300 by a predetermined distance or more. Since the solar cell 340 is installed at the side surface of the condensing lens 300 to collect the light to the side of the light, the volume and weight of the solar light collecting device can be significantly reduced. In addition, in order to collect light by the solar cell 240 installed at the side portion, the unit condensing lens unit 310 and the unit groove 320 are formed on the lower surface and the upper surface, respectively, and the linear focal point formed by the unit condensing lens unit 310 ( Since the light collected in F3) is reflected on the surface 322 formed in the shape of a cone, it is efficiently focused on the surface of the solar cell 340 provided on the side surface.

5 is a cross-sectional view illustrating a structure of a light collecting lens for photovoltaic power generation according to the fourth embodiment of the present invention.

As shown in FIG. 5, in the solar light condensing lens according to the fourth embodiment, a plurality of unit condensing lens units 410a having a convex round cross section is formed on a lower surface thereof, and an upper surface 410b. ) And the first condensing lens unit 410 and the lower surface 420a are formed flat, and the unit grooves 430 are respectively formed at predetermined positions corresponding to the unit condensing lens unit 410a on the upper surface 420b. The second condensing lens unit 420 is formed. FIG. 5 is a structure for reflecting and totally reflecting incident sunlight by varying the refractive indices of the first condensing lens unit 410 and the second condensing lens unit 420 and condensing on the surface of the solar cell 440 installed at a side thereof. to be. In addition, FIG. 5 is a modified example of the condensing lens for photovoltaic power generation according to the second embodiment of the present invention shown in FIG. 3, and light is transmitted and transmitted from the upper surface 420b of the second condensing lens unit 420. The reflected light is reflected by the unit condensing lens unit 410a formed on the bottom surface of the first condensing lens unit 410 so that the focus F4 is formed on the upper side of the second condensing lens unit 420, and the focal point F4 is formed. The light collected in the light is condensed to the surface of the solar cell 440 installed on the side by the surface 432 formed in the shape of a cone.

The first condensing lens portion 410 has a plurality of unit condensing lens portions 410a having a convex round cross section at its lower surface in the longitudinal direction, and the upper surface 410b is formed flat. In this case, a predetermined reflective material may be coated on the surface of the unit condensing lens unit 410a and the surface 433 formed in the shape of a conical curve. Here, the predetermined reflective material means a metal material having a reflectance of 90% or more, and aluminum, silver, gold, nickel, and the like may be used. In the present invention, it is preferable to use aluminum having a reflectance of 90% or more and being inexpensive as a reflecting material. In addition, the sum W4 of the widths of the plurality of unit condensing lens parts 410a is preferably formed to be 2 to 30 times the width H4 of the solar cell 440.

The second condensing lens unit 420 is formed of a material having a refractive index greater than that of the first condensing lens unit 410. In addition, the second condensing lens unit 420 is formed flat so that the lower surface 420a is stacked with the upper surface 410b of the first condensing lens unit 410. The second condensing lens unit 420 has one surface 431 formed on the image surface 420b in a direction to prevent refracted sunlight from entering, and the other surface 432 has a conical curve shape. The formed unit groove 430 is formed. Here, a plurality of unit grooves 430 may be formed such that the optical focus F4 having a conical curve is placed on the lens axis of the unit condensing lens unit 410a.

The sunlight 411 incident on the upper surface of the second condensing lens unit 420 is reflected by the unit condensing lens unit 410a of the first condensing lens unit 410, and the reflected light is reflected by the unit condensing lens unit After gathered at the focal point F4 formed by the 410a and reflected from the surface 432 formed in the shape of the conical curve of the unit groove 430, the light is collected directly on the surface of the solar cell 440, or the second condensing lens unit ( Total reflection between the upper and lower surfaces 420a and 420b of the 420 is condensed on the surface of the solar cell 440. In the present invention, the second condensing lens unit 420 is formed to have a refractive index larger than that of the first condensing lens unit 410, and passes through the second condensing lens unit 420 to allow the Light reflected in sequence from the surface 432 formed in the conical curve of the unit condensing lens unit 410a and the unit groove 430 forms an interface between the first condensing lens unit 410 and the second condensing lens unit 420. As it progresses toward, it is totally reflected on its boundary. At this time, the totally reflected light is directly concentrated to the surface of the solar cell 440. In addition, even when the light totally reflected at the interface between the first condensing lens unit 410 and the second condensing lens unit 420 travels toward the upper surface of the second condensing lens unit 420, the light is again on the upper surface in the same principle as above. Will be totally reflected. Here, since the refractive index of the second condensing lens unit 420 is always higher than the refractive index of the external atmosphere (n = 1), total reflection is made on the interface between the second condensing lens unit 420 and the external atmosphere.

According to the solar condensing lens according to the fourth embodiment of the present invention, since the first condensing lens unit 410 and the second condensing lens unit 420 are formed of materials having different refractive indices, the second condensing lens The light reflected by the surface 432 formed in the conical curve of the unit groove 430 of the unit 420 does not fly into the air, and the first condensing lens unit 410 and the second condensing lens unit 420 The light is reflected by the contact surface to be collected by the solar cell 440. In addition, since a solar cell 440 is provided on the side surface of the condenser lens and a condenser lens is used for condensing the solar cell 440, a solar condenser is installed compared to the case where a solar cell is provided below the condenser lens. Can significantly reduce the volume and weight of the

As such, the technical configuration of the present invention described above can be understood by those skilled in the art that the present invention can be implemented in other specific forms without changing the technical spirit or essential features of the present invention.

Therefore, the exemplary embodiments described above are to be understood as illustrative and not restrictive in all respects, and the scope of the present invention is indicated by the following claims rather than the detailed description, and the meaning and scope of the claims and their All changes or modifications derived from equivalent concepts should be construed as being included in the scope of the present invention.

1 is a view showing an operation mechanism of the condenser lens for photovoltaic power generation according to the present invention.

2 is a cross-sectional view showing a structure of a light collecting lens for photovoltaic power generation according to the first embodiment of the present invention.

3 is a cross-sectional view showing a structure of a light collecting lens for photovoltaic power generation according to the second embodiment of the present invention.

4 is a cross-sectional view showing a structure of a light collecting lens for photovoltaic power generation according to the third embodiment of the present invention.

5 is a cross-sectional view showing a structure of a light collecting lens for photovoltaic power generation according to the fourth embodiment of the present invention.

Claims (8)

Is provided with a solar cell on the side, the solar light condensing lens for condensing sunlight on the surface of the solar cell, On the upper surface, a plurality of unit condensing lens portions having a convex round cross section are formed in the longitudinal direction, On one surface, one surface is formed in a direction such that refracted sunlight does not enter, and the other surface has a unit groove formed in a cone shape on the lens axis of the unit condensing lens portion. A plurality of optical focuses are formed, The sunlight incident on the unit condensing lens unit is reflected on a surface formed in the shape of a conical curve of the unit groove and condensed on the surface of the solar cell. Condensing lens for solar power generation. The method of claim 1, The reflective surface is coated on the entire surface or the surface formed in the shape of the conical curve of the unit groove, Condensing lens for solar power generation. Is provided with a solar cell on the side, the solar light condensing lens for condensing sunlight on the surface of the solar cell, A first condensing lens portion having a plurality of unit condensing lens portions having a convex round cross section on an upper surface thereof in a longitudinal direction, and having a flat lower surface thereof; And The refractive index is greater than the refractive index of the first condensing lens portion, and an upper surface is formed to be flat so as to be laminated with a lower surface of the first condensing lens portion, and one surface is formed in a direction such that refracted sunlight does not enter the lower surface. On the other side, the second condensing lens unit is formed with a plurality of unit grooves formed in the shape of the conical curve so that the optical focus of the conical shape on the lens axis of the unit condensing lens portion; Including, The solar light incident on the unit condensing lens unit is reflected by a surface formed in the shape of a conical curve of the unit groove, and is directly collected on the surface of the solar cell, or totally reflected between upper and lower surfaces of the second condensing lens unit, thereby providing the solar cell. Condensed into the surface of the, Condensing lens for solar power generation. The method of claim 3, The second condensing lens unit is coated with a predetermined reflective material on the entire surface of the lower surface or a surface formed in a conical curve shape of the lower surface, Condensing lens for solar power generation. Is provided with a solar cell on the side, the solar light condensing lens for condensing sunlight on the surface of the solar cell, On the lower surface, a plurality of unit condensing lens portions having a convex round cross section are formed in the longitudinal direction, On one surface, one surface is formed in a direction to prevent refracted sunlight from entering, and the other surface has a unit groove formed in a conical curve shape on the lens axis of the unit condensing lens portion. A plurality of optical focuses are formed, The sunlight incident on the upper surface is sequentially reflected from the surface formed in the shape of the conical curve of the unit condensing lens unit and the unit groove, and is condensed on the surface of the solar cell, Condensing lens for solar power generation. The method of claim 5, A predetermined reflective material is coated on the surface of the unit condensing lens unit and the surface formed in the conical curve shape, Condensing lens for solar power generation. Is provided with a solar cell on the side, the solar light condensing lens for condensing sunlight on the surface of the solar cell, A first condensing lens portion having a plurality of unit condensing lens portions having a convex round cross section at a lower surface thereof in a longitudinal direction, and having an upper surface flat; And The refractive index is greater than the refractive index of the first condensing lens unit, and a lower surface is formed to be flat so as to be stacked with the upper surface of the first condensing lens unit, and one surface is formed in a direction to prevent refracted sunlight from being incident on the upper surface. On the other side, the second condensing lens unit is formed with a plurality of unit grooves formed in the shape of the conical curve so that the optical focus of the conical shape on the lens axis of the unit condensing lens portion; Including, The sunlight incident on the upper surface of the second condensing lens unit is sequentially reflected on the surface formed in the shape of the unit condensing lens unit and the unit groove of the first condensing lens unit and is condensed directly onto the surface of the solar cell, It is totally reflected between the upper and lower surfaces of the second condensing lens unit to be focused on the surface of the solar cell, Condensing lens for solar power generation. The method of claim 7, wherein A predetermined reflective material is coated on the surface of the unit condensing lens unit or the surface formed in the conical curve shape, Condensing lens for solar power generation.

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