IT202100029312A1 - COLOR EFFECT DAYLIGHT MANAGEMENT UNIT - Google Patents

Description

UNIT? COLOR EFFECT DAYLIGHT MANAGEMENT

Technical field

[1] Does the present invention refer in general terms to units? daylight management for the internal or external cladding of the transparent structures of a building facade, such as windows and glazing. In particular, the present invention is related to unit? of daylight management with chromatic effect, i.e. capable of interacting with an incident light in such a way as to generate reflected light with chromatic effects, thus offering? gives the observer a particular visual perception of the unit? itself and the surrounding environment.

State of art

[2] Between the units? of daylight management are known, among other things, the traditional units? of solar shading or unit? sunshades used in correspondence with the transparent structures of the facades, such as windows, French windows or glass doors, to reduce the entry of light from the outside into an environment. In general terms, the units? of solar shading comprise a structure of slats arranged parallel to each other and spaced along a direction orthogonal to the direction of development of the slats. The slats are generally fixedly constrained or movably connected to a support structure in such a way as to maintain the parallel and spaced arrangement. The mobile connection between the slats and the support structure? usually aimed at allowing the rotation of the lamellae each around an axis of rotation parallel to its own development axis. This allows adjustment of the inclination of the slats with respect to the transparent structure, which can therefore be modified according to the contingent meteorological conditions and/or the direction of the incident sunlight. Furthermore, the mobile connection between the slats and the support structure generally allows the slats to be grouped together in a package in such a way as to free up at least part of the surface of the transparent structure and thus allow greater light to enter the environment.

[3] Another type of unit? known daylight management system, particularly suitable for covering the transparent portions of facades, comprises a slat structure housed between a pair of thin panels transparent to visible light, secured to a support structure, for example a frame, in such a way as to be kept rigidly parallel and mutually spaced. The lamellar structure? therefore housed, generally in a suspended configuration, in the space between the two panels. These particular units? of solar shading are usually used to overlap or replace the transparent structures of the facades.

[4] Are they finally known units? daylight management systems configured to allow part of the incident light to enter, redirecting it by reflection towards the ceiling of the room. These particular units? of daylight management achieve the dual effect of effective shielding from incident sunlight with respect to the portions of the internal environment in which people usually sit, without however losing substantial quantities of light that could penetrate into this environment. The internal environment is therefore overall more bright compared to the use of units? of solar shading.

[5] The units? known daylight management techniques, although offering an excellent result in terms of protection and shading with respect to the sunlight incident on the facades, are not usually able to offer particular chromatic effects. In particular, the units daylight management systems configured to reflect part of the incident sunlight towards the internal environment tend to produce a light reflected in the internal environment which, on a clear day and with the exception of the brief transitory moments of sunrise and sunset, is cold and uncomfortable. Specifically, this reflected light, if directed on the ceiling or on a light wall in a mainly directional way, creates the effect of lunar-type lighting in the internal space or, that is, characterized by the presence of surfaces illuminated by cold light and dark shadows without of color, or, if directed on the ceiling or on a light wall in a mainly diffused way, the effect of a gray and overcast sky. The internal lighting generated by this cold light also appears unnatural as it lacks the component of diffused blue light coming from the sky, which outdoors on a clear day illuminates and colors the shadows blue. This component is in fact substantially shielded from the units? notes, failing to reach the internal environment. Last but not least, the appearance of the units? known daylight management does not undergo substantial variations between the conditions in which the unit? ? irradiated by sunlight and the condition in which the unit? Not ? irradiated. These units? of daylight management always appear substantially dark, taking away the brightness of the window. typical of an opening towards the sky and instead offering the image of a closed window or portion of a window, i.e. obscured by shutters, roller shutters or similar.

[6] The Applicant therefore strongly perceived the need to create a unit? of daylight management that is capable of giving a chromatic effect to the light reflected towards the internal environment, in particular making the reflected light more warm and pleasant, and to recreate a lighting condition internally in the environment similar to that which would occur in the absence of the unit? of solar shielding, i.e. including a component of diffuse blue light similar to that which would produce the diffuse light coming from the sky, penetrating through the transparent structures. In this way the unit? of daylight management presents the same appearance as an unobscured window, through which? possible to see the sky on a clear sunny day.

[7] The Applicant has also considered designing a?unit? of daylight management which, in certain conditions, can take on a different chromatic appearance, offering an observer an aesthetic effect of the unit? itself of particular liking.

Summary of the Invention

[8] In a first aspect, the present invention is directed to a?unit? of daylight management which includes a plurality? of lamellae, each having an elongated development along a respective lamella development axis C. Each lamella has two opposing faces with a much wider extension. pronounced along a first direction parallel to the development axis C and a section orthogonal to the development axis C which is substantially constant and having center of gravity B, the set of centers of gravity B of the sections defining a center of gravity axis. The slats are arranged parallel to each other with the center of gravity axes included in the same plane of the axes and spaced along a spacing direction included in the plane of the axes and orthogonal to the center of gravity axes B. ? Furthermore, a slat support structure configured to support the plurality is provided. of lamellae in parallel lamellae condition.

[9] In the configuration of use of the unit, each slat of the plurality? of lamellae includes a first non-flat upper face, defining an upper surface comprising at least a portion having, with reference to a section plane orthogonal to the development axis C, concavity facing upwards and at least one reflective portion, and a second lower face defining a lower surface.

[10] According to the present invention, at least one of the upper surface and the lower surface comprises at least a portion that has a greater regular reflectance for wavelengths of incident light in the red range than for wavelengths of light incident light in the blue range and greater diffuse reflectance for incident light wavelengths in the blue range than for incident light wavelengths in the red range.

[11] With ?red interval? ? understood as a range of wavelengths between 600 nm and 740 nm.

[12] With ?yellow interval? ? meaning a range of wavelengths between 530 nm and 600 nm.

[13] With ?blue interval? ? understood in a broad sense as a range of wavelengths between 380 nm and 500 nm, therefore also including wavelengths that conventionally range from violet to cyan.

[14] Advantageously, the particular configuration of the slats allows the daylight incident on the unit to be effectively redirected. management of daylight upwards of the internal environment delimited by this unit, with reference to the entire range of directions and angles of incidence of sunlight depending on the time of day and time of year, normally between 10? and 80?. AND? in fact, it should be considered that direct solar radiation impacts from altitudes and azimuthal angles which constantly vary depending on both the time of day and the period of the year, while the diffuse radiation emitted from the sky comes from all the visible areas of the celestial vault. Furthermore, the particular reflection behavior given by at least part of the surface of the slats allows to recreate the component of diffused blue light capable of imitating the effect of soft lighting generated by the sky within an environment. In this way the shaded areas not illuminated by the direct light reflected by regular reflection from the slats are tinged with blue due to the effect of the diffused light reflected by diffuse reflection from the same slats, as would happen in the absence of solar shading.

[15] The particular reflection behavior given by at least part of the surface of the lamellae also gives a characteristic aesthetic appearance on the side of the slats inside the environment delimited by the unit? of daylight management, when the slats are hit by a collimated beam of incident light, whereas with a collimated beam? meaning a light beam having a main propagation direction and an angular divergence around this propagation direction less than 45?, preferably less than 10?, even more? preferably less than 2?. Specifically, a diffused blue light is generated directed internally to the environment which makes the slats appear bright and blue when observed from the internal environment, producing an image similar to the image of a clear sky.

[16] The unit? according to the present invention can? understand one or more? of the following additional features, which can also be combined as desired in order to meet specific requirements defined by a corresponding application purpose.

[17] In a variant of the invention, the at least one upper surface portion having concavity facing upwards? the portion of the upper reflective surface.

[18] In a variant of the invention, the lower surface includes at least one reflective portion configured to cooperate with the at least one reflective portion of the upper surface of an adjacent lamella placed underneath, so as to redirect rays upwards incident on the reflective portion of the upper surface of the adjacent plate.

[19] Preferably, at least one portion that has a greater regular reflectance for wavelengths of incident light in the red range than for wavelengths of incident light in the blue range and a greater diffuse reflectance for incident light wavelengths in the blue range versus incident light wavelengths in the red range? at least one reflective portion of the lower surface.

[20] Preferably, at least one reflective portion of the lower surface of each lamella is arranged at or near? of one?extremity? lateral exit of the lamella, with reference to a section orthogonal to the development axis C in which the lamellae have two ends? opposite sides, and in which the at least one reflective portion of the upper surface of each lamella is placed at one?extremity? entrance side, opposite the end? of exit.

[21] In the context of the present invention and the accompanying claims, for ?extremity? of? entrance? do you mean the extremity? on the side configured to accept sunlight coming from the outside, i.e. the side configured to accept a wide variation of acceptance directions of the incident light, while for the ?extremity? exit? do you mean the extremity? on the side configured to direct the reflected light towards the other, specifically towards the ceiling, i.e. according to a smaller width of output directions compared to the width of the acceptance directions.

[22] In this way? what? guaranteed that the rays of light that manage to pass from the radiation side to the opposite side of the unit? of daylight management have undergone at least one reflection on the reflective portion of the lower surface of a slat, thus giving rise to a differentiated reflection depending on the wavelength of the light and thus generating? the bluish diffused light that gives the slats, seen from inside the environment delimited by the unit, daylight management, the brightness? and the blue color that the invention wants to obtain.

[23] Preferably, the at least one reflective portion of the lower surface of each blade has a flat conformation or has a concavity in use? facing downwards.

[24] Advantageously, this allows cooperation with the reflective portion, possibly with concavity? facing upwards, of the upper surface of an underlying lamella in order to redirect the rays reflected by it upwards.

[25] In a variant of the invention, the at least one portion that has a greater regular reflectance for wavelengths of incident light included in the red range than for wavelengths of incident light included in the blue range and greater diffuse reflectance for incident light wavelengths in the blue range than for incident light wavelengths in the red range includes at least one of the following characteristics:

- includes a diffusion layer which in turn includes a plurality? of nanometric diffusion elements made in a first material having a first refractive index immersed in a second material having a second refractive index different from the first, the nanometric elements of the plurality? of nanometric diffusion elements being configured to preferentially diffuse small-wavelength incident light components over long-wavelength incident light components;

- ? arranged on at least one of the upper surface and the lower surface in such a way as to intercept at least 50%, preferably 70%, plus? preferably 90% of the regularly reflected rays exiting the unit? in the case of incident rays having a direction that forms an angle of incidence? with a horizontal plane, the angle of incidence is ? being between 40?-50?, preferably between 30?-60?, more? preferably between 20?-70?;

- extends for at least 10%, preferably for at least 20%, more? preferably for at least 30% of the whole of the upper and lower surfaces of the lamella; And

- ? arranged at or near? of one?extremity? exit side of the lamella with reference to a section orthogonal to the development axis C in which the lamellae have two ends? opposite sides.

[26] Preferably, at least one of the first and second materials present a greater absorption for wavelengths of incident light included in the red and yellow range than for wavelengths of incident light included in the blue range .

[27] In a variant of the invention, the at least one portion that has a greater regular reflectance for wavelengths of incident light included in the red range than for wavelengths of incident light included in the blue range and a greater diffuse reflectance for incident light wavelengths in the blue range than for incident light wavelengths in the red range? covered or protected by a layer of transparent material, such as paint or a polymer film.

[28] Preferably, the nanometric diffusion elements of the diffusion layer are substantially transparent or substantially non-absorbent at least with respect to electromagnetic radiation with a wavelength included in the visible light spectrum, have average dimensions between 5 nm and 350 nm, preferably between 10 nm-250 nm, more? preferably between 40 nm-180 nm, even more? preferably between 60 nm-150 nm, and refractive index np and are immersed in a host material that is substantially transparent or substantially non-absorbent at least with respect to electromagnetic radiation with a wavelength included in the visible light spectrum and having a refractive index nh, such why

the relationship between refactoring indices? included in the interval 0.5? m ?2.5 , for example

0.7? m ?2.1 or 0.7? m ?1.9.

[29] Alternatively, the nanoscale diffusion elements of the diffusion layer are present in the diffusion layer in a number N per unit? of area as a function of an effective diameter of element or particle D = dc nh (D indicated in [meters]), dc being the diameter of the pi? small cylinder that on average circumscribes said nanometric elements, which falls within the range defined by

[30] In a variant of the invention, the nanometric diffusion elements of the diffusion layer are selected from the group consisting of:

- nanometric elements in solid phase,

- nanometric elements in liquid phase,

- nanometric elements in the gaseous phase,

- three-dimensional metal oxides

- nano-pores

- nano-channels, e

- nano-pillars.

[31] In a variant of the invention, the first material is a metal oxide, preferably aluminum oxide (alumina), titanium oxide (titania) or zinc oxide.

[32] In a variant of the invention, the second material is air or? selected from a polymer, a resin, a silicone, a different oxide, said second material being at least partially non-absorbent, or transparent at least to electromagnetic radiation with a wavelength included in the visible light spectrum and having a second refractive index n2 between 1 .3 and 1.55, preferably between 1.49 and 1.52.

[33] In a variant of the invention, the second material is a resin based on soluble fluoropolymers, preferably a polyurethane resin with high fluorocarbon content, plus? preferably a resin based on soluble fluoropolymers with a second refractive index n2 between 1.45 and 1.50, even more? preferably with a second refractive index n2 equal to 1.48.

[34] In a variant of the invention, at least the portion that presents a greater regular reflectance for wavelengths of incident light included in the red range compared to wavelengths of incident light included in the blue range and a greater diffuse reflectance for incident light wavelengths in the blue range than for incident light wavelengths in the red range? configured to satisfy at least one of:

- do not substantially absorb light in the visible range; and/or

- scatter light at a wavelength of 450 nm at least 1.2 times, preferably at least 1.4 times, more? preferably 1.6 times more? efficiently of light at a wavelength of approximately 630 nm, i.e. having a diffuse reflectance at a wavelength of 450 nm at least 1.2 times, preferably at least 1.4 times, more? preferably at least 1.6 times greater than the diffuse reflectance at 630 nm, and/ regularly reflect the light at the wavelength of 630 nm at least 1.05 times, preferably at least 1.2 times, more? preferably 1.6 times, more? efficiently of light at a wavelength of about 450 nm, i.e. having a regular reflectance at a wavelength of 630 nm at least 1.05 times, preferably at least 1.2 times, more? preferably at least 1.6 times greater than the regular reflectance at 450 nm; and/or

- generate a regularly reflected beam having chromatic coordinates included in a region of the CIE 1976 u?-v? color plane with coordinates u? > 0.210 and v? > 0.470 and a maximum Cartesian distance in this color plane less than 0.1 from the Planck curve referred to the light source that illuminates the unit? of daylight management, where this light source is a standard CIE E illuminator, and a diffuse reflected beam having chromatic coordinates included in a region of the color plane with coordinates u?<0.210 and v?<0.430, when illuminated by a standard CIE E illuminator; and/or - have greater absorption for wavelengths of incident light in the red and yellow range than for wavelengths of incident light in the blue range.

[35] In a variant of the invention, the reflective portion of the lower surface of the lamella and the reflective portion of the upper surface of the lamella each comprise at least one point of tangency such that the tangents to the surfaces in the plane of section orthogonal to the axis of development C and at their respective points of tangency do they form a smaller angle? at least 10?, preferably at least 20? more? preferably at least 40?.

[36] In the scope of this description and in the attached claims, with the expression ?minor angle? referring to two lines that intersect in a plane? understood as the lower or maximum angle or equal to 90? which is formed between the two straight lines.

[37] In this way? guaranteed that the solar rays incident on each slat, usually having an inclination between 10? and 80? with respect to a direction parallel to a horizontal plane depending on the time of day and the period of the year, are redirected by reflections on the upper surfaces of an underlying blade and the lower surface of a blade placed above according to one direction at most included in a horizontal plane or, preferably, directed upwards or towards the ceiling.

[38] In a variant of the invention, the lower surface of each blade includes a shielding portion adjacent to the reflective portion of the blade and extending towards the end of the blade. side of the entrance of the blade opposite to the end? output, the shielding portion being configured to block the passage of light from one side of the unit to another? in the absence of reflections on the lamellae.

[39] In a variant of the invention, the upper surface includes at least a pair of adjacent flat portions inclined to each other in such a way as to define above, in the section plane orthogonal to the development axis C, an angle ? less than 180?.

[40] There? guarantees that the concavit? of the slats is facing upwards, thus leading to redirecting the incoming light by multiple reflection towards the top of the internal environment.

[41] In a variant of the invention, the slats of the plurality? of slats are constrained to the support structure each in a rotatable manner around a rotation axis parallel or coinciding with its own center of gravity axis B between a first and a second end position, the first and second end position being chosen in such a way that the portion of the upper reflective surface remains with its concavit? facing upwards in all the operating positions that can be assumed by the slats between the first and second end positions.

[42] In a variant of the invention, the support structure includes at least a pair of vertical uprights to which the slats of the plurality are attached. of slats in a fixed or rotatable manner, each around an axis of rotation parallel or coinciding with its own center of gravity axis B.

[43] Alternatively, the support structure includes a plurality? of suspension laces connected to an upper support bar, the plurality? of slats being tied to the suspension laces in such a way as to each be rotatable around an axis of rotation parallel or coinciding with its own center of gravity axis B.

[44] Preferably, the support structure ? housed in a hollow housing chamber defined between a pair of panels at least partially transparent to visible light.

Brief Description of the Drawings

[45] The accompanying drawings, which are incorporated herein and form part of the description, illustrate exemplary embodiments of the present invention and, together with the description, are intended to illustrate the principles of the present invention.

In the drawings:

Fig.1 ? a schematic perspective view of a first embodiment of a unit? of daylight management according to the present invention;

Fig. 2 ? a cross-sectional view of a pair of slats employed in the embodiment of the unit? of daylight management of figure 1;

Fig.3? a cross-sectional view of a pair of slats employed in an alternative embodiment of the unit? daylight management according to the invention;

Figs. 4a and 4b are perspective cutaway views of two variants of slats used in alternative embodiments of the unit. of daylight management according to the present invention;

Fig.5 ? a schematic exploded perspective view of a second embodiment of a unit? of daylight management according to the present invention;

Fig. 6 ? a schematic perspective view of a third embodiment of a unit? of daylight management according to the present invention;

Fig. 7 ? a cross-sectional view of a pair of slats employed in the embodiment of the unit? of daylight management of figure 6;

Fig. 8 and 9 are perspective cross-section views of two variants of slats of the type used in the third embodiment of the unit? of daylight management according to the present invention;

Fig. 10a and 10b are cross-section views of pairs of lamellae which differ from each other in the shape of the lower surface;

Fig.11 ? a schematic representation of the reflection effects offered by the unit? daylight management according to the first embodiment of the present invention;

Fig. 12 and 13 are schematic representations of the reflection effects offered by the units? of daylight management according to the first embodiment of the present invention with respect to a plurality? of inclinations of the slats and of the incident sunlight; Fig.14 ? a schematic representation of what a unit looks like? of daylight management according to the first embodiment of the present invention, perceived by an observer placed on an internal side or on an external side of the unit? itself;

Fig.15 ? a schematic representation of the reflection effects offered by the unit? daylight management according to the third embodiment of the present invention;

Fig.16 ? a schematic representation of the reflection effects offered by the unit? of daylight management according to the third embodiment of the present invention with respect to a plurality? of inclinations of the incident sunlight; And

Fig.17 ? a schematic representation of what a unit looks like? of daylight management according to the third embodiment of the present invention, perceived by an observer placed on an internal side or on an external side of the unit? itself.

Detailed Description

[46] What follows? a detailed description of exemplary embodiments of the present invention. The exemplary embodiments described herein and illustrated in the drawings are intended to convey the principles of the present invention, allowing the person skilled in the art to implement and use the present invention in numerous different situations and applications. Therefore, exemplary embodiments are not intended, n? should be considered as limiting the scope of patent protection. Rather, the scope of patent protection is ? defined by the attached claims.

[47] In the following description, for the illustration of the figures, identical reference numbers or symbols are used to indicate construction elements with the same function. Furthermore, for clarity of illustration, some references may not be repeated in all figures.

[48] The use of ?for example?, ?etc?, ?or? means non-exclusive alternatives without limitation unless otherwise indicated. The use of ?includes? and ?includes? means ?comprising or including, but not limited to? unless otherwise indicated.

[49] Furthermore, the use of measurements, values, shapes and geometric references (such as perpendicular and parallel) associated with terms such as ?approximately?, ?almost??, ?substantially? or similar, ? to be understood as ?unless there are measurement errors? or ?unless there are inaccuracies due to manufacturing tolerances? and in any case ?unless there is a slight divergence with respect to the values, measurements, shapes or geometric references? what is the term? associated.

[50] Finally, terms such as ?first?, ?second?, ?superior?, ?inferior?, ?principal? and ?secondary? are generally used to distinguish components belonging to the same typology, not necessarily implying an order or priority? of relationship or position.

[51] With reference to Fig. 1 ? illustrated schematically a?unit? of daylight management according to a first embodiment of the present invention - hereinafter for brevity? even simply 'unit?' - overall indicated with 200 in Fig. 1. The unit? 200 of fig.

1 ? of the type called "sunshade". The unit? 200 includes a plurality? of lamellae 201 each having an elongated development along a respective development axis C of the lamella. The slats 201 therefore have two opposing faces surrounded by thin perimeter walls, in the order of a millimeter or submillimetric, i.e. having a much larger extension. pronounced along a first development direction parallel to the C axis, with respect to a second development direction of these walls, and head walls orthogonal to the C axis. In particular, the lamellae 201 have a section orthogonal to the C development axis substantially constant having center of gravity B and the set of centers of gravity B of the sections defines a center of gravity axis. The slats 201 are arranged parallel to each other, such that their center of gravity axes B are all included in the same plane of the axes, and spaced along a direction included in the plane of the axes and orthogonal to the center of gravity axes B. In particular, each blade 201 ? spaced from the adjacent slats by a distance d, measured in the plane of the center of gravity axes B as the distance between the respective center of gravity axes B. With the unit? installed for use, the slats 201 are supported with their center of gravity axes B orthogonal to a vertical plane so that the plane of the axes that includes them is a vertical plane; the direction along which the slats are spaced from each other is, specifically, the vertical direction (i.e. perpendicular to the ground).

[52] In particular, in the embodiment of Fig.1, the slats are constrained to a support structure 220 which includes at least a pair of vertical uprights 222. The slats 201 are pivoted to the uprights 222 in such a way that each one can rotate around an axis of rotation parallel or coinciding with the respective center of gravity axis B between a first and a second end position, being able to assume any operating position included in the angular interval between the first and the second end position. To control the rotation of the slats 201, in the embodiment of Fig. 1 the support structure 220 includes two control rods 221 movable along the direction orthogonal to the B axes and fixedly connected to a free side of the slats 201 to drag them into vertical translation, thus determining the inclination of the slats 201 each around its own axis of rotation.

[53] The slats 201 used in the unit? of daylight management 200 according to the present invention comprise a first non-flat upper face, defining an upper surface 211 comprising at least a portion having, with reference to a section plane orthogonal to the center of gravity axis B, a concavity facing upwards in at least one plurality? of operating positions that can be assumed by the slats, when the unit? 200 ? in use configuration and at least one reflective portion. In particular, in the present case the reflective portion coincides with the concavit portion? facing upwards.

[54] Preferably, the lamellae 201 comprise a first non-flat upper face defining a reflective upper surface 211 having at least one portion with concavit? facing upwards in all the operating positions that the slats can assume when the unit? 200 ? in use configuration. In the scope of this description and in the attached claims, with ?concavit? facing upwards? ? understood to be an upper surface with a curved profile with at least one portion presenting a curvature with concavit? facing upwards, is an upper surface comprising flat portions, where at least one pair of adjacent flat portions comprises portions inclined to each other in such a way as to define an angle at the top? less than 180?.

[55] With ?reflective? surface portion ? meaning a portion of surface configured to regularly reflect an incident light beam comprising one or more? electromagnetic radiation having wavelengths included at least in the visible spectrum (i.e. 380 nm ? ? ? 740 nm). For example, the reflecting surface or face has a regular reflectance of at least 30%, preferably at least 50%, more? preferably at least 70%? Made of a metallic material, such as aluminum (Al), titanium (Ti), silver (Ag), zinc (Zn), etc. or an alloy, such as stainless steel, comprising such materials. Possibly, the reflective surface or face can? be subjected to a polishing process (mechanical or chemical). The reflected light beam can have an intensity profile? bright with an angular opening equal to or slightly greater than the angular opening of the intensity profile? brightness of the incident light beam depending on the characteristics of the surface or reflecting face.

[56] The slats 201 used in the unit? daylight management modules 200 according to the present invention also each include a second lower face defining a lower surface 212. The lower surface preferably includes at least one reflective portion 213, in particular arranged at an end? exit side 201a of the lamella, with reference to a section orthogonal to the direction of development C in which the lamellae have two ends? opposite sides 201a,201b.

[57] ? furthermore, a shielding portion 215 is preferably provided adjacent to the reflective portion 213 and extending towards an end? lateral entry 201b of the blade, opposite to the end? of exit 201a. The shielding portion? preferably configured to block the direct passage of solar rays towards the interior of the environment without suffering reflections, in particular for low angles of incidence of the incident light. The unit? daylight management 200 ? in fact, in particular it is configured to be mounted inside an environment with the extremity lateral entrance 201b disposed proximal to a transparent structure of a building, for example the glass of a window, and the end? lateral outlet 201a located distal from the transparent structure. In general terms, the unit? daylight management 200 ? configured to be mounted at or near of a transparent structure of a building with the extremity side entrance 201b which faces towards the source of natural light, i.e. towards the outside with respect to the environment delimited by the transparent structure.

[58] In particular, with reference to the section plane orthogonal to the development direction C and at parity? of width of the lamella measured as tip-to-tip distance in the orthogonal section plane, the screening portion 215 and the reflecting portion 213 form an internal corner ? all the more? small how much more? ? the distance d between adjacent lamellae 201 is large. In particular, for long distances d, the lower surface 212 takes on a smaller shape. pointed (shown by way of example in Fig.10a), given for example by an acute angle that is formed internally between the reflecting portion 213 and the screening portion 215. On the contrary, for reduced distances d, the lower surface 212 takes on a more shape? flattened (shown as an example in Fig. 10b), given for example by an obtuse angle that is formed internally between the reflecting portion 213 and the shielding portion 215. These conformations are chosen so as to prevent the entry of rays for low angles of incidence of light (for example about 10? or less).

[59] ? Furthermore, a reflective portion 214 of the upper surface 211 can be identified, preferably located at the end? entrance side 201b, opposite the end? of exit 201a. The reflective portion 213 of the lower surface 212 and the reflective portion 214 of the upper surface 211 located at the end? entrance lateral 201b are configured to redirect upwards by multiple reflection the rays incident on the portion 214 of the upper surface 211, for at least one operating position among the operating positions that can be assumed by the slats 201.

[60] In the scope of this description and in the attached claims, with ?redirect upwards? ? understood as the reflection effect, preferably multiple reflection, of at least part of the light rays incident on a plate, along directions forming an angle greater than or equal to 0? with a horizontal plane (i.e. parallel to the ground) passing through the point of last reflection with reference to multiple reflections.

[61] By way of example, the reflective portion 213 of the lower surface 212 and the reflective portion 214 of the upper surface 211 each include at least one section or a point of tangency such that the tangents to the surfaces in the plane of section orthogonal to the axis of development C and in the respective sections or points of tangency do they form a smaller angle? of at least 10?, preferably at least 20?, more? preferably at least 40?. This relationship is valid both for adjacent lamellae - making s? that the reflective portion 213 of a lamella placed above interacts with the reflective portion 214 of the upper surface 211 of an underlying lamella in such a way as to redirect upwards by multiple reflection the rays incident on the underlying lamella - both with reference to the surface portions 213 and 214 of the same slat, all the slats 201 being shaped in the same way and constrained to the support structure 220 according to the same orientation and spacing.

[62] According to the present invention, at least part of the upper surface 211 and/or lower surface 212 of the lamellae 201? in particular at least part of the reflective portion 213 of the lower surface 212 of the blades - presents a greater regular reflectance for wavelengths of incident light included in the red range compared to wavelengths of incident light included in the blue range and a greater diffuse reflectance for incident light wavelengths in the blue range than for incident light wavelengths in the red range.

[63] In the context of this description and subsequent claims, the terms ?regular reflectance? and ?diffuse reflectance? refer to the definitions provided in the E284 standard regarding the terminology that describes the appearance of materials and light sources (ASTM E284-09a, Standard Terminology of Appearance, ASTM International, West Conshohocken, PA, 2009). Furthermore, with the term ?spooky? reference is made to regular reflectance and diffuse reflectance evaluated as a function of the wavelengths of light.

[64] Consequently, when a light beam strikes the blade 201, the electromagnetic radiations with wavelengths included in the blue range (380 nm ? ? ? 500 nm) of the light beam preferentially undergo diffusion ? also referred to as dispersion or scattering - with respect to the wavelengths included in the red range (600 nm ? ? ? 720 nm). For example, the blade 201 does not substantially absorb light in the visible range and scatters light at the wavelength of 450 nm (blue) at least 1.2 times, for example at least 1.4 times, such as at least 1.6 times more? efficiently of light at a wavelength of approximately 630 nm (red). In other words, at a wavelength of 450 nm (blue) the diffuse reflectance of lamella 201 ? at least 1.2 times, for example at least 1.4 times, such as at least 1.6 times greater than the diffuse reflectance at 630 nm (red). Similarly, the lamella 201 regularly reflects the light at the wavelength of 630 nm (red) at least 1.05 times, for example at least 1.2 times, such as at least 1.6 times, more? efficiently of light at a wavelength of about 450 nm (blue). In other words, at the wavelength of 630 nm (red) the regular reflectance of the lamella 201 ? at least 1.05 times, for example at least 1.2 times, such as at least 1.6 times greater than the regular reflectance at 450 nm (blue).

[65] There? determines that, due to the effect of diffuse reflection, the blade 201 takes on a substantially blue color when hit by a substantially directional (collimated) light beam of white light - for example a beam of white light having divergence of less than 45?, preferably less than 10? ?, even more? preferably less than 2? (for example, solar radiation) - which impinges on the surface of the blade from a direction that forms an angle? with a horizontal plane (in the orthogonal section plane). The blue color of the 201 blade? observable from any direction substantially different from the specular direction with respect to the direction of illumination, i.e. from a direction for which the observer does not see the specular reflection of the source, for example from a direction forming an angle with the specular direction with respect to the direction of the incident beam greater than the semi-divergence of said incident light beam. At the same time, when hit by a directional light beam of white light, the blade 201 takes on a warm colour, for example a yellow, orange or reddish colour, if observed in the specular direction with respect to the direction of illumination, i.e. from a direction which the observer sees the specular reflection of the incident light.

[66] Specifically, the Applicant characterized the aesthetic effect obtained, finding that this effect was characterized by:

- a regularly reflected beam having chromatic coordinates included in a region of the CIE 1976 u?-v? color plane with coordinates u? > 0.210 and v? > 0.470 and a maximum Cartesian distance in this color plane less than 0.1 from the Planck curve referred to the light source that illuminates the unit? of daylight management, where this light source is a standard CIE E illuminator; And

- a diffuse reflected beam having chromatic coordinates included in a region of the color plane with coordinates u?<0.210 and v?<0.430.

[67] The regular and diffuse reflectances described above and/or the chromatic coordinates indicated above are obtained, for example, when at least part of the lower surface 212 of the lamellae 201 ? in particular at least part of the substantially flat reflective portion 213 of the lower surface 212 of the slats? ? coated with a diffusion layer 202 comprising a dispersion of a plurality? of nanometric diffusion elements configured to preferentially diffuse small-wavelength incident light components over long-wavelength incident light components, thus implementing a diffusion of incident light in a Rayleigh-like regime or chromatic diffusion.

[68] In the specific case of the embodiment of Fig.2, the slats 201 comprise two linear sections in section, inclined to each other in such a way as to define an angle ? less than 180?, preferably less than 160? and above 90?, more? preferably less than 150? and above 120?.

[69] In an alternative embodiment - of which only the slats 201 are illustrated in Fig. 3 - these slats comprise in section a plurality of of linear sections. The sections placed at the ends? lateral sides 201a, 201b are inclined to each other in such a way that at least one pair of adjacent sections defines an angle ? less than 180?, preferably less than 160? and above 90?, more? preferably less than 150? and above 120?.

[70] The Rayleigh-like diffusion layer or chromatic diffusion layer? a layer that covers at least a portion of the upper surface and/or the lower surface of the lamellae and includes a random distribution of nanoelements (nanoparticles, nanochannels, nanopillars, etc.) of a first material in a second material of different refractive index, where for random distribution means a disordered distribution, i.e. devoid of order over distances large compared to the dimensions of the nanoelements.

[71] In the lamellae illustrated in Fig.2 and Fig.3, the Rayleigh-like diffusion layer or chromatic diffusion layer? a layer that covers the entire surface of the blade (not illustrated). This layer can for example, be obtained through anodization processes in the case of blades made of metallic material. These layers generally include inclusions in the gaseous phase (nanovoids/nanopores) in a solid matrix, such as aerogels which are commonly formed by metal oxides, such as silica, alumina, iron oxide which form a solid structure that hosts pores (inclusions air/gas) for example with a channel shape, or pillars with nanometric dimensions. As a further example, this layer can? be obtained through surface treatments of lamellas with surfaces made or coated in organic polymers (for example polyacrylates, polystyrene, polyurethanes and epoxy) treated to form a solid structure that hosts pores (air/gas inclusions) or forms pillars with nanometric dimensions.

[72] Alternatively, as shown in Fig. 4a and 4b, the Rayleigh-like diffusion layer or color diffusion layer 202 ? a layer applied to at least a portion of the lower surface 212 of the lamella, possibly in addition to other surface portions of the lamella. In the case of an applied layer, the diffusion layer in the Rayleigh 202-like regime? preferably made of a material loaded with substantially transparent or substantially non-absorbing nanoparticles at least with respect to electromagnetic radiation with a wavelength included in the visible light spectrum, having average dimensions between 5 nm and 350 nm, preferably between 10 nm-250 nm, more ? preferably between 40 nm-180 nm, even more? preferably between 60 nm-150 nm, referring to a diameter of the pi? small DC cylinder that surrounds them. The nanoparticles have a refractive index np and are immersed in a host material that is substantially transparent or substantially non-absorbent at least with respect to electromagnetic radiation with a wavelength included in the visible light spectrum and

having a refractive index nh, such that the ratio between refraction indices ? included in the interval 0.5? m ?2.5 , for example 0.7? m ?2.1 or 0.7? m ?1.9.

[73] Considering that the diffusion effects are consequent, among other things, to a jump in the refractive index between nanoparticles and host material, nanoparticles can be both solid particles and optically equivalent nanometric elements in liquid or gaseous phase, such as inclusions generally liquid or in the gaseous phase (for example nanodrops, nanovoids, nanoinclusions, nanobubbles, etc.) i.e. elements that have nanometric dimensions and are incorporated into the host material.

[74] Furthermore, the number N of nanoparticles acting as diffusers in the Rayleigh-like regime or in the chromatic diffusion regime, defined per unit? of area of the chromatic diffusion layer and as a function of an effective particle diameter D = dc nh, preferably falls within the range defined by

for example, for embodiments that want to simulate the presence of a clear sky,

for example, for embodiments that want to simulate a northern sky, <N ?>

[meters-2], (D indicated in [meters]) and N ?

[meters-2] like

[metres-2], more? specifically

[metres-2].

[75] Differently, in the case of metal oxides or polymeric structures, the Rayleigh 202-like diffusion layer comprises a nano-pillar or nano-pore structure in a first material having a first refractive index n1, immersed in a second material having a second refractive index n2 different from the first, where the difference between the refractive indices and the nano-pillar or nano-pore structure are configured to provide a greater regular reflectance for wavelengths of incident light included in the red range relative to incident light wavelengths in the blue range and greater diffuse reflectance for incident light wavelengths in the blue range than for incident light wavelengths in the blue range red range. For example, the first material that constitutes the nano-pore structure is? metal oxide, preferably aluminum oxide, or alumina (Al2O3), preferably anodic aluminum oxide or AAO (acronym for the English expression 'Anodic Aluminum Oxide'), titanium oxide (titania) or zinc oxide and the second material? for example air, or ? selected from a polymer, a resin, a silicone or a different oxide (for example deposited by sol-gel) transparent or at least partially non-absorbent at least with respect to electromagnetic radiation with a wavelength included in the visible light spectrum and having a second refractive index n2 between 1.3 and 1.55, preferably between 1.49 and 1.52, for example polyvinyl chloride (PVC), polymethyl methacrylate (PMMA), polyfluorides (such as, PVDF) or transparent polyacrylates. According to a preferred embodiment, the second material is a resin based on soluble fluoropolymers, preferably a polyurethane resin with high fluorocarbon content, plus? preferably a resin based on soluble fluoropolymers with a second refractive index n2 between 1.45 and 1.50, even more? preferably with a second refractive index n2 equal to 1.48. A coating layer of this type? described in detail in international patent application no. PCT/IB2021/053151 filed on 16 April 2021 in the name of the same Applicant and referred to in full here.

[76] The Rayleigh 202-like diffusion layer comprising a nano-pillar or nano-pore structure can? determine, in addition to the variability effect? chromaticity as a function of the wavelength of the incident light described above, also a variability? chromatic? i.e. a dependence of regular reflectance and/or diffuse reflectance? dependent on the direction of illumination or incidence. In other words, the color for which an observer sees the blade 201 from an observation direction close to the direction of specular reflection, and possibly, but not necessarily, also the color for which an observer sees the blade 201 from a distant observation direction on the direction of specular reflection, depends on the angle of incidence of the light beam incident on the reflective portions of the lamella 201. In the case of lamellae with variable chromatic diffusion, ? in fact, a perceptible variation in the color taken on by the slats depends on their inclination, as well as on the regularly reflected beam. The color of the slats, instead of remaining essentially blue in color, varies color depending on the specific angle of incidence of the light on the reflective portions of the slats, showing different shades. ranging from blue to grey. Furthermore, depending on the same angle of incidence, the beam of reflected light regularly varies color between shades? of yellow in shades? red.

[77] In particularly advantageous embodiments, the upper surface 211 of the lamella 201 is also ? at least partially covered by a Rayleigh-like diffusion layer or color diffusion layer 202, as shown in Fig. 4b. In particular, the upper surface 211 of the lamella 201? coated with a chromatic diffusion layer 202 at least in correspondence with the reflective portion 214 of the upper surface 211 preferably located at the extremity side of the inlet 201b of the blade 201, opposite the end? of exit 201a.

[78] With reference to Fig. 5 ? Schematically illustrated is a second embodiment of a?unit? daylight management 200? according to the present invention. The unit? 200? of Fig. 5 ? of the type called ?Venetian style?. The unit? 200? of Fig. 5 includes a plurality? of lamellae 201 each having an elongated development along a respective lamella development axis C. The slats 201 have a section orthogonal to the development axis C which is substantially constant and has a center of gravity B and the set of centers of gravity B of the sections defines a center of gravity axis. The slats 201 are arranged parallel to each other, with the center of gravity axes included in a plane of the axis and spaced along a direction included in the plane of the axis and orthogonal to the axes B of development of the slats. The slats 201 are supported in their parallel condition and spaced by a distance d between adjacent slats 201 by a support structure 220?, the distance d being preferably variable between a maximum distance dmax in which the unit? 200? assumes an open configuration and a minimum distance dmin in which the slats 201 assume a packet configuration. In the embodiment of Fig. 5 the support structure 220? does it include a plurality? of suspension laces 225 connected to an upper support bar 226. The suspension laces 225 are linked to the slats 201 in a known manner, so that they can all be controlled simultaneously in rotation, each around an axis of rotation parallel or coinciding with the own center of gravity axis B and/or be able to modify the relative distance between an open configuration and the closed configuration.

[79] Alternatively, according to an embodiment not illustrated, the relative distance d can? be modified by translating the attachment points of the rotation axes on the side uprights of a unit? of the sunshade type (unit of the type illustrated in Fig.1).

[80] Also in this case the slats used in the unit? daylight management systems include a first non-flat upper face, defining an upper surface 211 having at least one concavit portion facing upwards preferably in all the operating positions that the slats can assume when the unit? 200? is found in the use configuration and at least one reflective portion, which preferably coincides with the concavit portion? facing upwards. The slats also comprise a second lower face defining a lower surface 212. In particular, the lower surface 212 has at least one reflective portion 213, preferably arranged at one end exit side 201a of the blade and configured to redirect upwards the rays reflected by a portion 214 of the upper surface 211 of an underlying blade 201, preferably located at an end entrance side 201b, opposite the end? of exit 201a. Furthermore, the lower surface 212 preferably includes a shielding portion 215, adjacent to the reflective portion 213 and extending towards the end lateral entry 201b of the blade opposite to the end? of exit 201a. Furthermore, at least part of the lower surface 212 of the lamellae 201 has a greater regular reflectance for incident light wavelengths in the red range than for incident light wavelengths in the blue range and a greater diffuse reflectance for incident light wavelengths in the blue range versus incident light wavelengths in the red range.

[81] In the embodiment of Fig.5, the unit? daylight management 200? ? supported in a suspended configuration from the upper support bar 226 and between a pair of panels 227 at least partially transparent to visible light, for example made of glass, constrained in such a way as to define between them a hollow housing chamber in which it is is the unit ready? 200?. In the embodiment of Fig.5, the two transparent panels 227 are attached to a support frame 228 which also includes the upper support bar 226. The unit? 200? of Fig.5 ? usually used for the construction of buildings called "double skin".

[82] In the realization of Fig. 5, the internal corner is formed between the shielding portion 215 and the reflective portion 213? defined with reference to the maximum distance dmax between adjacent slats 201.

[83] With reference to Fig. 6 ? Schematically illustrated is a third embodiment of a?unit? daylight management 200?? according to the present invention. The unit? 200?? of Fig. 6 includes a plurality? of lamellae 201 each having an elongated development along a respective axis C of lamella development. The slats 201 therefore have two opposing faces surrounded by perimeter walls having a much larger extension. pronounced along a first direction of development parallel to the axis C, with respect to a second direction of development of these walls, and head walls orthogonal to the axis C. The lamellae 201 have a section orthogonal to the development axis C which is substantially constant having center of gravity B and the set of centers of gravity B of the sections defines a center of gravity axis. The slats 201 are arranged parallel to each other, such that their center of gravity axes B are all included in the same plane of the axes, and spaced from each other along a direction included in the plane of the axes and orthogonal to the center of gravity axes B. With the unit? installed for use, the slats 201 are supported with their development axes C orthogonal to a vertical plane so that the plane of the axes that includes them is a vertical plane; the direction along which the slats are spaced apart from each other is, specifically, the vertical direction. In particular, in the embodiment of Fig.6, the slats are fixedly constrained to a support structure 220. Preferably, the fixed support structure includes at least a pair of vertical uprights 222, for example uprights conforming to substantially flat panels as illustrated in Fig. 6, or struts conforming to cylinders spanning and supporting the slats, and each slat 201 ? spaced from the adjacent slats by a distance d measured in the plane of the center of gravity axes as the distance between the respective center of gravity axes B.

[84] As illustrated in Fig.7, the slats 201 used in the unit? 200?? of Fig.6 include a first non-flat upper face, defining an upper surface 211 having at least one concavit portion in use? facing upwards and preferably reflective. The 201 slats used in the unit? 200?? of Fig.6 also include a second lower face defining a lower surface 212 having at least one reflective portion 213 placed at one end? output side 201a of the blade 201 and configured to redirect upwards the rays reflected by a reflective portion 214 of the upper surface 211 of an underlying blade 201, preferably located at an end entrance side 201b, opposite the end? of exit 201a. With reference to the extremity? of exit 201a and at the end? of input 201b consider that, in general terms, the unit? 200?? ? configured to be mounted on a transparent structure of a building with the end? side entrance 201b which faces towards the source of natural light, i.e. towards the outside with respect to the environment delimited by the transparent structure.

[85] The reflective portion 213 of the lower surface can? have a flat conformation or have a concavit in use? facing downwards, in particular to cooperate with the concavit portion? facing upwards of the upper surface 211 of an underlying blade in order to redirect the rays reflected by it upwards.

[86] Furthermore, the lower surface 212 preferably includes a shielding portion 215, adjacent to the reflective portion 213 and extending towards an end? lateral entry 201b of the blade opposite to the end? of exit 201a. Furthermore, at least the reflective portion 213 of the lower surface 212 of the blades has a greater regular reflectance for wavelengths of incident light included in the red range than for wavelengths of incident light included in the blue range and a reflectance diffused greater for incident light wavelengths in the blue range than for incident light wavelengths in the red range.

[87] In particular, as shown in Fig. 8 and 9, the Rayleigh-like diffusion layer or chromatic diffusion layer 202 ? a layer applied at least to the reflective portion 213 of the lower surface 212 of the blade.

[88] In particularly advantageous embodiments, the upper surface 211 of the lamella 201 is also ? at least partially or entirely covered by a Rayleigh-like diffusion layer or color diffusion layer 202, as shown in Fig.9. In particular, the upper surface 211 of the lamella 201? coated with a chromatic diffusion layer 202 at least in correspondence with the reflective portion 214 of the upper surface 211, preferably located at the extremity side of the inlet 201b of the blade 201, opposite the end? of exit 201a.

[89] In alternative embodiments not illustrated, the upper surface 211 of the lamella 201 is covered by a chromatic diffusion layer 202 at least in correspondence with the output portion in proximity to of the extremity side exit 201a.

[90] Figs. 10a and 10b show different conformations that the lower surface 212 can? assume as a function of the distance d between adjacent and equal slats 201? of width of the lamellae measured as tip-to-tip distance in the orthogonal section plane. In particular, Fig. 10a shows a lower surface 212 with a pointed shape given for example by a corner ? acute which is formed internally between the reflective portion 213 and the shielding portion 215. This conformation proves to be particularly suitable in case of high distance, allowing to prevent the entry of rays due to low angles of incidence of the light (for example of approximately 10? or lower). On the contrary, Fig.10b illustrates a flattened conformation of the lower surface 212, given for example by an angle ? obtuse which is formed internally between the reflective portion 213 and the shielding portion 215. This conformation proves to be particularly suitable in the case of a short distance and allows to prevent the entry of rays due to low angles of incidence of the light.

[91] The functioning of the unit? of daylight management according to the present invention? schematically illustrated in Figs. 11-14 with reference to the case in which the slats 201 are made as illustrated in Figure 2, and in Figures 15-17 with reference to the case in which the slats 201 are made as illustrated in Fig.7.

[92] In particular, Figs. 11 and 15 illustrate the unit? 200,200?,200?? with the slats 201 arranged according to a first inclination with respect to the sunlight 300 incident on them, such as to regularly reflect it upwards through multiple reflections between pairs of adjacent slats 201. A spectral portion 301 of mainly regularly reflected sunlight looks like this? outside the field of vision of an observer placed in the internal environment standing in front of the unit? 200,200,200??. Otherwise, a spectral portion of sunlight reflected mainly in a diffuse manner 302 is visible to an observer placed in the internal environment delimited by the unit? 200,200?,200??. As shown in Figs. 11 and 15, the two portions of light that reach the internal environment will present two different correlated color temperatures or CCTs: the spectral portion 301 of mainly regularly reflected sunlight appears to have a first correlated color temperature CCT1 lower than a second correlated color temperature CCT2 of the spectral portion of primarily diffusely reflected sunlight 302, preferably the second correlated color temperature CCT2 ? at least 1.2 times, preferably 1.3 times, more? preferably 1.5 times, even more? preferably 1.8 times greater than the first CCT1, and/or a CCT equal to 5600 Kelvin.

[93] Fig.12 schematically compares two different inclinations of the slats 201 with reference to the same angle of incidence? of sunlight, showing in particular how the incident rays are regularly reflected upwards, thus being directed outside the field of vision of an observer placed in the internal environment in front of the unit? 200,200?.

[94] Fig. 13 like this? as Fig.16 show the multiple reflections between pairs of adjacent blades as a function of the angle of incidence? of sunlight. Also in this case ? It is possible to appreciate that the incoming rays are regularly reflected upwards for all the inclinations typically assumed by sunlight depending on the time of day and the period of the year.

[95] Finally, in Figs. 14 and 17 show the external and internal observation sides schematically, showing on the left how the external side of the unit appears. 200,200?,200?? to an observer placed in front of it and to the right as the internal side appears to an observer placed in front of it. Therefore, as represented in Figs. 14 and 17, the internal side of the unit? 200,200?,200?? appears to have a uniform bluish color of the shade? of a clear sky, due to the greater diffuse reflectance for wavelengths of incident light included in the blue range compared to wavelengths of incident light included in the red range. The blue color given by the greater diffuse reflectance for wavelengths included in the blue range? therefore completely independent of the color assumed by the sky, in fact it can also be reproduced at night, in case the unit? is hit by a beam of artificial white light, for example the light projected by a street lamp or other dedicated lighting.

Claims (10)

Claims 1. Unit? of daylight management (200,200?,200??) including a plurality? of lamellae (201) each having an elongated development along a respective development axis (C) of lamella, each lamella (201) presenting two opposite faces having much longer extension pronounced along a first direction parallel to the development axis (C) and a section orthogonal to the development axis (C) substantially constant and having a center of gravity (B), the set of centers of gravity of the sections defining a center of gravity axis (B) , the slats (201) being arranged parallel to each other with the center of gravity axes (B) included in the same plane of the axes and spaced along a spacing direction included in the plane of the axes and orthogonal to the center of gravity axes (B), and a slat support structure (220,220?) configured to support the plurality? of lamellae (201) in condition of parallel lamellae, in which, in the configuration of use of the unit? (200,200?,200??), each lamella (201) of the plurality? of slats (201) includes a first non-flat upper face, defining an upper surface (211) comprising at least one portion having, with reference to a section plane orthogonal to the development axis (C), concavity? facing upwards and at least one reflective portion (214), and a second lower face defining a lower surface (212), characterized in that at least one of the upper surface (211) and the lower surface (212) comprises at least a portion which presents a greater regular reflectance for wavelengths of the incident light included in the red range with respect to wavelengths of incident light in the blue range and greater diffuse reflectance for incident light wavelengths in the blue range than for incident light wavelengths in the red range. 2.Unit? (200,200?,200??) according to claim 1, wherein the at least one upper surface portion having concavity? facing upwards? the reflective upper surface portion (214); and/or l? at least one reflective portion (213) of the lower surface (121) of each blade (201) has a flat conformation or has a concavit in use? facing downwards. . 3.Unit? (200,200?,200??) according to claim 1 or 2, wherein the lower surface (212) includes at least one reflective portion (213) configured to cooperate with the at least one reflective portion (214) of the upper surface (211) of an adjacent blade (201) placed underneath, so as to redirect upwards rays incident on the reflective portion (214) of the upper surface (211) of the adjacent blade (201), and wherein, optionally, the at least one portion having greater regular reflectance for incident light wavelengths in the red range than for incident light wavelengths in the blue range and greater diffuse reflectance for incident light wavelengths in the blue range versus incident light wavelengths in the red range? l?at least one reflective portion (213) of the lower surface (212), e wherein, optionally, the at least one reflective portion (213) of the lower surface (212) of each lamella (201) is arranged at or near? of one?extremity? exit side (201a) of the lamella, with reference to a section orthogonal to the development axis (C) in which the lamellae have two ends? opposite sides (201a,201b) and in which the at least one reflective portion (214) of the upper surface (211) of each lamella (201) is placed at one?extremity? entrance side (201b), opposite the end? exit (201a). 4. Unit? (200,200?,200??) according to any one of claims 1 to 3, wherein the at least one portion having a greater regular reflectance for wavelengths of the incident light included in the red range with respect to wavelengths incident light wave in the blue range and a greater diffuse reflectance for incident light wavelengths in the blue range than for incident light wavelengths in the red range includes at least one of the following : includes a diffusion layer (202) which in turn includes a plurality? of nanometric diffusion elements made in a first material having a first refractive index immersed in a second material having a second refractive index different from the first, the nanometric elements of the plurality? of nanometric diffusion elements being configured to preferentially diffuse small-wavelength incident light components over long-wavelength incident light components; ? arranged on at least one of the upper surface and the lower surface in such a way as to intercept at least 50%, preferably 70%, plus? preferably 90% of the regularly reflected rays exiting the unit? in the case of incident rays having a direction that forms an angle of incidence? with a horizontal plane, the angle of incidence is ? being between 40?-50?, preferably between 30?-60?, more? preferably between 20?-70?; extends for at least 10%, preferably for at least 20%, more? preferably for at least 30% of the whole of the upper (211) and lower (212) surfaces of the lamella (201); and ? arranged at or near? of one?extremity? exit side (201a) of the slat (201) with reference to a section orthogonal to the development axis (C) in which the slats have two ends? opposite sides (201a,201b). 5. Unit? (200,200?,200??) according to claim 4 wherein the nanometric diffusion elements of the diffusion layer (202) are substantially transparent or substantially non-absorbent at least with respect to electromagnetic radiation with a wavelength included in the visible light spectrum, have average dimensions between 5 nm and 350 nm, preferably between 10 nm -250 nm, more? preferably between 40 nm-180 nm, even more? preferably between 60 nm-150 nm, and refractive index np and are immersed in a host material that is substantially transparent or substantially non-absorbent at least with respect to electromagnetic radiation with a wavelength included in the visible light spectrum and having a refractive index nh, such why the relationship between refactoring indices? included in the interval 0.5? m ?2.5 , for example 0.7? m ?2.1 or 0.7? m ?1.9 ; and/or are the nanometric diffusion elements of the diffusion layer (202) present in the diffusion layer (202) in a number N per unit? of area as a function of an effective diameter of element or particle D = dc nh (D indicated in [meters]), dc being the diameter of the pi? small cylinder that on average circumscribes said nanometric elements, which falls within the range defined by the nanometric diffusion elements of the diffusion layer (202) are selected from the group consisting of: - nanometric elements in solid phase, - nanometric elements in liquid phase, - nanometric elements in the gaseous phase, - three-dimensional metal oxides - nano-pores, - nano-channels e - nano-pillars; and/or in which the first material ? a metal oxide, preferably aluminum oxide (alumina), titanium oxide (titania) or zinc oxide; and/or in which the second material is? air or? selected from a polymer, a resin, a silicone, a different oxide, said second material being at least partially non-absorbent, or transparent at least to electromagnetic radiation with a wavelength included in the visible light spectrum and having a second refractive index (n2) included between 1.3 and 1.55, preferably between 1.49 and 1.52; and/or in which the second material is? a resin based on soluble fluoropolymers, preferably a polyurethane resin with high fluorocarbon content, plus? preferably a resin based on soluble fluoropolymers with a second refractive index (n2) between 1.45 and 1.50, even more? preferably with a second refractive index (n2) equal to 1.48, and/or at least one of the first and second materials present a greater absorption for wavelengths of incident light included in the red and yellow range than for wavelengths of incident light included in the blue range. 6. Unit? (200,200?,200??) according to any of the preceding claims, wherein the at least one portion which presents a greater regular reflectance for wavelengths of the incident light included in the red range with respect to wavelengths of the light incident light in the blue range and a greater diffuse reflectance for wavelengths of incident light in the blue range than for wavelengths of incident light in the red range? configured for at least one of: - scatter light at a wavelength of 450 nm at least 1.2 times, preferably at least 1.4 times, more? preferably 1.6 times more? efficiently of the light at the wavelength of about 630 nm and regularly reflect the light at the wavelength of 630 nm at least 1.05 times, preferably at least 1.2 times, more? preferably 1.6 times, more? efficiently of light at a wavelength of about 450 nm; and/or - generate a regularly reflected beam having chromatic coordinates included in a region of the CIE 1976 u?-v? color plane with coordinates u? > 0.210 and v? > 0.470 and a maximum Cartesian distance in this color plane less than 0.1 from the Planck curve referred to the light source that illuminates the unit? (200,200?,200??), where this light source is? a standard CIE E illuminator, and a diffuse reflected beam having chromatic coordinates included in a region of the color plane with coordinates u?<0.210 and v?<0.430, when illuminated by a standard CIE E illuminator; and/or - present a greater absorption for wavelengths of incident light included in the red and yellow range compared to wavelengths of incident light included in the blue range. 7. Unit? (200,200?,200??) according to any one of claims 3 to 6, wherein the reflective portion (213) of the lower surface (212) of the lamella (201) and the reflective portion (214) of the upper surface (211) of the lamella (201?) each include at least one point of tangency such that the tangents to the surfaces in the section plane orthogonal to the development axis C and in the respective points of tangency form a smaller angle ? of at least 10?, preferably at least 20?, more? preferably at least 40?. 8. Unit? (200,200?,200??) according to any one of claims 3 to 7, wherein the lower surface (212) of each lamella (201) includes a shielding portion (215) adjacent to the reflective portion (213) of the lamella (201 ) and extending towards the extremity? side entry (201b) of the blade opposite to the end? output (201a), the shielding portion (215) being configured to block the passage of light from one side of the unit to another in the absence of reflections on the lamellae (201). 9. Unit? (200,200?,200??) according to any of the previous claims, in which the upper surface (211) includes at least a pair of adjacent flat portions inclined to each other in such a way as to define above, in the section plane orthogonal to the axis of development (C), an angle (?) less than 180?. 10. Unit? (200,200?,200??) according to any of the previous claims, in which the plates (201) of the plurality? of slats (201) are constrained to the support structure (220) each in a rotatable manner around a rotation axis parallel or coinciding with its own center of gravity axis (B) between a first and a second end position, the first and the second end position? being chosen in such a way that the portion of the upper reflective surface (211) remains with its concavit? facing upwards in all the operating positions that can be assumed by the slats between the first and second end positions; and/or the support structure (220,200??) includes: - at least a pair of vertical uprights (222) to which the slats (201) of the plurality are attached? of slats in a fixed or rotatable manner, each around an axis of rotation parallel or coinciding with its own center of gravity axis (B); or - a plurality? of suspension laces (225) connected to an upper support bar (226), the plurality? of slats being tied to the suspension laces (225) in such a way as to each be rotatable around an axis of rotation parallel or coinciding with its own center of gravity axis (B); and/or the support structure (220?) ? housed in a hollow housing chamber defined between a pair of panels (227) at least partially transparent to visible light.