FR3064663A1 - OPTICAL OPTICAL CHARACTERISTIC GLAZING - Google Patents

Abstract

The present invention relates to a glazing unit (1) comprising - at least two transparent sheets (2a, 2b) connected to their edge by a frame (3), and delimiting between them an interspace (4), - a first controllable optical system ( 5) arranged in said intermediate space, - a first control system (54) allowing the first controllable optical system to move,

Description

® FRENCH REPUBLIC

NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number: 3,064,663 (to be used only for reproduction orders) (© National registration number: 17 52772

COURBEVOIE © IntCI ⁸

E 06 B 3/67 (2017.01), E 06 B 9/24

A1 PATENT APPLICATION

©) Date of filing: 03.31.17. © Applicant (s): SAINT GOBAIN GLASS FRANCE - (30) Priority: FR. @ Inventor (s): NADAUD NICOLAS. ©) Date of public availability of the request: 05.10.18 Bulletin 18/40. (© List of documents cited in the report of preliminary research: Refer to end of present booklet (© References to other national documents @ Holder (s): SAINT GOBAIN GLASS FRANCE. related: ©) Extension request (s): © Agent (s): SAINT GOBAIN RESEARCH Anonimous society.

GLAZING WITH CONTROLLED OPTICAL CHARACTERISTICS.

FR 3 064 663 - A1

The present invention relates to a glazing (1) comprising

- at least two transparent sheets (2a, 2b) connected at their edge by a frame (3), and delimiting between them an intermediate space (4),

- a first controllable optical system (5) arranged in said intermediate space,

- a first control system (54) enabling the first controllable optical system to be set in motion,

GLAZING WITH CONTROLLED OPTICAL CHARACTERISTICS

The present invention relates to the field of glazing comprising 5 - at least two transparent sheets connected to their edge by a frame, and delimiting between them an intermediate space, a first controllable optical system arranged in said intermediate space.

PRIOR ART

Currently, it is known to have glazing fitted with optical elements. Glazing may be in the form of a pane mounted in a frame or two panes, one interior and one exterior, connected at their edge by a frame, and delimiting between them an intermediate space.

These optical elements may be in the form of a plastic film placed on at least one of the faces of the said glazing (s) or of a curtain which can take place along the glazing. The curtain is arranged outside the glazing or in the intermediate space.

It is also possible that the plastic film is replaced by an inorganic thin layer deposited on one side of the glazing. This thin layer can be based on silver and makes it possible to filter outside light to modify its characteristics.

However, these solutions have many drawbacks. Indeed, the solution consisting in using a plastic film or a deposited layer has the disadvantage of being fixed, that is to say that it is impossible to change the film or the deposited layer or to choose when the solution must be active or not.

For the curtain solution, this has the drawback of not allowing the light from the past once the curtain is lowered, which limits the use of such a curtain.

There are also double glazing type windows comprising a blackout system mounted in the intermediate space. This blackout system can be a Venetian type blind or rolled up blind. If a Venetian blind consists of horizontal slats, located in a wire ladder and a mechanism for lifting and orienting the slats, a blind can also include a roller to which is fixed a blackout element such as a film or fabric that can slide in the insert space.

The disadvantage of these systems is that they do not have variable optical properties. Indeed, these systems consist of blackout elements like blinds which are more or less stretched / slid in order to let more or less light pass. It is not a question here of having a system which would allow light to pass over the entire surface of the glazing, but which would modify / filter the light in order to adapt to external conditions.

SUMMARY OF THE INVENTION

The present invention therefore proposes to solve these drawbacks by providing glazing provided with an optical system allowing a variation in optical properties such as transmittance while remaining usable.

To this end, the invention relates to a glazing unit comprising at least two transparent sheets connected at their edge by a frame, and delimiting between them an intermediate space, a first controllable optical system arranged in said intermediate space, a first control system allowing the setting in motion of the first optical system controllable in a first direction,

Characterized in that said first controllable optical system comprises at least one pair of reels arranged parallel to a second direction orthogonal to the first direction, on two opposite sides of said glazing, and a film arranged to be wound on at least one of said reels , the rotation of at least one of said winders allowing the displacement of said film in the plane of the glazing, and in that said film is arranged to comprise at least two distinct zones each extending over the entire extent of said film in the second direction and each having different optical properties.

The advantage of the present invention is that it makes it possible to obtain a glazing whose optical characteristics can be modified and selected by the user. This modification and selection of the optical characteristics of the glazing is done by maintaining the sealing of the glazing because the system is located in the cavity of the double glazing.

According to one example, the film has a length which is at least equal to a multiple of the distance between the two winders, said multiple being equal to the number of distinct zones.

According to an example, each distinct zone of the film comprises at least one optical layer making it possible to modify the light flux passing through said distinct zone.

According to an example, the glazing comprises three transparent sheets connected to their edge by a frame arranged to delimit a first intermediate space and a second intermediate space, said first controllable optical system being arranged in said first intermediate space.

According to an example, the glazing further comprises a second controllable optical system arranged in said first intermediate space controlled by a second control system, said second controllable optical system comprising a pair of winders arranged in parallel on two opposite sides of said glazing, different from opposite sides used for the first controllable optical system, and a film mechanically connecting said winders.

According to one example, the glazing further comprises a second controllable optical system arranged in the second intermediate space and controlled by a second control system, said second controllable optical system comprising a pair of reels arranged in parallel on two opposite sides of said glazing and a film mechanically connecting said reels.

According to one example, the control means are mechanical.

According to an example, the control means comprise two toothed wheels each associated with a reel and a drive chain used to mechanically connect the two reels via the gear wheels, the control means further comprising an interface means comprising a rod control associated with a gear system connected to one of the gear wheels of the winders for transmitting the rotational movement of the rod on itself to the gear to which the gear system is connected.

According to one example, the control means are electro-mechanical.

According to one example, the control means comprise at least one electric motor associated with one of the reels and controlled by a control unit connected to an external interface unit.

According to an example, the connection between said control unit and said external interface unit 5 is wired.

According to an example, the connection between said control unit and said external interface unit is wireless.

In one example, said electric motor and a control unit are magnetically connected.

îo The invention further relates to a system comprising at least one glazing according to the invention, said system further comprising a calculation unit connected to at least one sensor, said calculation unit being arranged to receive data representative of at least a measurement operated by said sensor and for processing its data in order to generate a control signal sent to the control means of said glazing.

DESCRIPTION OF THE FIGURES

Other particularities and advantages will emerge clearly from the description which is given below, for information and in no way limitative, with reference to the appended drawings, in which:

- fig. 1 to 3 are schematic representations of the glazing mounted or incomplete according to a first embodiment of the invention;

- fig. 4a and 4b are schematic representations of the film used in the invention;

- fig. 5 and 6 are schematic representations of a first embodiment of the control means of the invention;

- fig. 7 and 8 are schematic representations of a second embodiment of the control means of the invention;

- fig. 9 and 10 are schematic representations of different embodiments of a variant of the invention;

- fig. 11 to 13 are schematic representations of a second embodiment of the invention;

DETAILED DESCRIPTION OF THE INVENTION

In Figure 1 is shown a glazing 1 according to the invention. Such glazing 1 5 comprises a first window / sheet 2a or exterior window and a second window / sheet 2b called interior window. The first window 2a and the second window 2b are connected at their edge by a frame 3 making it possible to delimit between them an intermediate space 4.

In one variant, one of the panes 2a, 2b may be an insulating pane, that is to say comprising two sheets of glass between which is interposed a sheet of poly (vinyl butyral) or poly (vinyl butyral) (PVB) .

According to the invention, the glazing 1 also comprises a controllable optical system 5. Such a system is arranged in the intermediate space between the first window and the second window.

In a first embodiment, the glazing 1 comprises a controllable optical system 5. This controllable optical system 5 comprises two cylindrical parts 51 acting as a reel, each part 51 possibly being a drum or a shaft. These two reels 51 are arranged, in the intermediate space, on opposite sides of said glazing 1 as visible in Figures 1 and 2. The reels 51 are placed in a vertical position as in Figure 3 or horizontal and parallel to one 'other.

The controllable optical system 5 further comprises an optical film 52. Such an optical film consists of film or sheet having a length L.

This film 52 is fixed to the reels 51 so that two opposite ends are each fixed to a reel 51.

Now, cleverly, the film 52 is designed to present at least two distinct zones 53, each zone 53 having its own optical characteristic as can be seen in FIGS. 4a and 4b.

Each zone 53 having its own optical characteristic is obtained by the deposition of at least one thin layer Ci having a particular property.

This layer Ci modifies the luminous flux, the luminous flux being the flux corresponding to both visible and infrared or even ultraviolet light.

For integration into the glazing 1, the film 52 is dimensioned to have a length at least equal to the distance between the two winders 51 multiplied by the number of zones 53, each zone 53 having a length equal to the distance between the two reels. The zones 53 are therefore advantageously arranged to extend over the length of the film 52, that is to say the direction of movement of the film. It is understood by this that a zone 53 occupies said film 52 over the entire width of the film, that is to say that zone 53 extends over the entire extent of the film in a direction orthogonal to the direction of displacement of the film and over part of the length of the film, the different zones being contiguous with respect to each other. The film 52 therefore has a minimum total length of twice the distance between the reels since it comprises at least two zones. Provision may be made for the length of each zone 53 to be greater than that of the glazing in order to be sure that said film extends over the entire surface of the glazing.

This integration at the level of the glazing 1 is thus carried out so that each end of the film 52 is fixed to one of the reels 51. Since the length of said film 52 is greater than the distance between the two reels 51, the film must therefore be partially wound on one of the two reels 51.

For its operation, the controllable optical system 5 further comprises control means 54. These control means 54 are used to control at least one of the reels 51 in order to set it in rotation. This rotation of at least one of the reels 51 makes it possible to wind the film on one or the other of the reels. This winding makes it possible to have one of the zones of the film arranged between the two panes of the glazing. Consequently, the area of the film located between the two panes changes the optical properties of the glazing. Indeed, like each zone having its own optical characteristic, the light flux passing through the glazing will be altered as a function of the properties of the thin layer or layers deposited on said zone.

In a first embodiment visible in FIG. 5, the control means 54 are electromechanical. These control means 54 comprise at least one electric motor 54a associated with one of the reels 51. Preferably, each reel 51 is associated with an electric motor 54a. In the case of a single motor 54a, a mechanical link makes it possible to connect the two winders 51. These motors 54a are controlled by a control unit 54b itself connected to an external interface unit 54c. There may be one control unit 54b per motor 54a or only one for the two motors 54a. This external interface unit 54c allows the user to act on the motors 54a to rotate either of the reels. Cleverly, each motor 54a is configured to allow the reel 51 with which it is associated to wind the film around it. In a configuration in which the reels 51 are arranged horizontally with a first reel 51 at the top of the glazing 1 and a second reel 51 at the bottom of the glazing 1, actuation of the first reel 51 makes it possible to wind the film 52 around the first reel 51 , the film 52 moving from bottom to top while actuation of the second reel 51 allows the film to be wound around the second reel 51, the film moving from top to bottom.

It will be understood that the external interface unit 54c is used to send a current to the motors in order to put them in rotation. This outdoor interface unit îo 54c can be a single box arranged at the level of the glazing or be in the form of a box associated with a remote control or with an application integrated in a mobile device such as an electronic tablet or a mobile phone.

In an advantageous variant visible in FIG. 6, the control means 54 comprise a magnetic transmission. This magnetic transmission makes it possible to transmit to the reels 51 a rotational movement without a mechanical connection being present. This magnetic transmission comprises for example a first magnet 54d connected to the reel 51 and a second magnet 54e associated with the motor 54a, this motor 54a being arranged in frame 3. This configuration then makes it possible to improve the seal since it does 'is not necessary to provide an opening for a mechanical connection which requires a seal to ensure sealing.

In a second embodiment visible in Figures 7 and 8, the control means 54 are mechanical. These control means 54 comprise, for example, two toothed wheels 54A, each associated with a reel 51. A drive chain 54B is used to mechanically connect the two reels 51 via the toothed wheels. The control means 54 further comprise an interface means 54C comprising a control rod 54D associated with a gear system 54E connected to one of the reels 51. The gear system makes it possible to transmit the rotational movement over itself of the rod 54D to rotate the reel 51. The rotation of the reel 51 causes the toothed wheel 54A with which it is associated to rotate and the second reel 51 to rotate via the drive chain 54B.

In a configuration in which the reels 51 are arranged horizontally with a first reel at the top of the glazing and a second reel at the bottom of the glazing, a rotation of the rod clockwise makes it possible to wind the film around the first reel, the film moving from bottom to top while a rotation of the rod anticlockwise makes it possible to wind the film around the second reel, the film moving from top to bottom.

In an advantageous variant of the embodiments, the controllable optical system further comprises tensioning means 55. These tensioning means 55 are used to tension the film 52. In fact, the optimal functioning of the film requires that the latter be stretched. However, the configuration with two reels on which the film is fixed and rolled up may not allow the film to be stretched under all circumstances.

According to a first embodiment visible in FIG. 9, these tensioning means 55 comprise a tensioning roller 56 whose diameter will be significantly less than the main coil. This tensor roller 56 is arranged to press locally on said film in order to tension it. This tensioning roller is for example a roller associated 56a with a spring 56b allowing said roller to exert a stress on the film 52 in order to tension it.

According to a second embodiment visible in FIG. 10, the tensioning means 55 comprise a spring 56c or a blade allowing tensioning via a restoring force exerted on the axis of one or both winders 51.

It is therefore understood that at least one of the two reels 51 is mounted to have a clearance allowing the spring or the blade exerting a restoring force to move said roller to tension the film 52. This second embodiment has the advantage of having a smaller footprint. Indeed, compared to the first embodiment, it is not necessary to have a tension roller.

Of course, it is understood that the different embodiments also work for reels 51 arranged vertically.

In another variant, it can be provided, in order to facilitate the translation of the film in the daylight part, to create an invisible guide rail within the spacers along the ends of the polymer film. Likewise, the two reels can be hidden from the outside by a slit plate allowing both to protect the winding system but also to tension / guide the film before winding.

As mentioned before, the film is designed to comprise at least two distinct zones, each zone having its own optical characteristic.

When choosing the film, several criteria must be taken into account. These criteria are:

- Resistance to heating. Indeed, the controllable optical system 5 is arranged in the cavity between the two panes forming the glazing. Preference will then be given to polymers which are intrinsically not very absorbent in the visible and especially in the near infrared (IR) in order to avoid overheating of the film 52 in the cavity, which could cause buckling, the wrinkling of the film.

îo Such overheating can also occur with the presence of an absorbent magnetron layer on the plastic film even if the polymer is very transparent.

- UV resistance: Ultraviolet rays (UV) have an impact on film 52 since the photons of these UV rays alter the molecular chains of the polymers causing the degradation of said polymers. It is therefore essential to add UV protection to the film composition, except in the case of laminated glazing having an outer laminated glass 22.2mm or more, which very significantly limits the UV charge which can damage the film.

- "Coatable". The polymeric film 52 will be covered, on either side of the film, with a stack of thin layers making it possible to provide an incomplete or complete function of low emissivity, solar control, anti-glare or blackout (privacy). . The chemical (fluorinated) nature of the film may make it incompatible with the adhesion of dielectric or metallic layers. In this case, treatment of the corona type, atmospheric plasma or ion bombardment under vacuum will be preferred in order to provide the hydrophilia necessary for the deposition of the thin layers, for example by magnetron. The deposition of thin layers to modify the visible or thermal response will be carried out by magnetron sputtering or by vacuum evaporation in a suitable deposit of the roil-to-tolI type.

- Visible transparency and IR infrared: Usable polymer films must ensure perfect transmission in the visible. This will avoid any highly crystallized polymer, which can induce opalescence / diffusion phenomena. PET or poly (ethylene terephthalate) for example is a semi-crystalline polymer whose crystallinity is induced by stretching. It therefore has two Young modules of 4.5 to 6.5 GPa against less than 2 GPx for PET orpο amorphous. The need for extreme transparency of the film therefore means favoring perfectly amorphous polymers so as not to induce defect of the fuzzy or opalescent type in the glazing. There is therefore a compromise to be found between transparency in the visible without defect, Young's modulus and winding capacity while remaining within the elastic limit making it possible to wind without irreversible distortion of the film.

Likewise, in the case of active glazing where it is essential that if positions are provided where the bare polymer film (without reflective layer) is unwound, it is necessary to minimize the energy absorption (AE) by a relevant choice of polymer to avoid overheating of the polymer film (folding problem already mentioned), premature aging of the film 52 or simply a reduction in solar factor when the maximum solar contribution is desired. - same remark on the magnetron layer where solutions of weak AE must be privileged.

As the polymeric film will always remain within the cavity, therefore without contact with outside air, humidity, etc., it is not necessary to ensure a particular chemical or even mechanical resistance both for the polymeric film but also for coating thin layers - beyond the minimum resistance necessary for their implementation and mounting within the insulating glazing. A film strength such as that of lowE layer products based on low silver functional material is sufficient.

Thus, let us note among examples of possible polymers: FEP (Fluorinated ethylene propylene), PFA (Perfluoroalkoxy polymer resin) and finally ETFE and ECTFE (Ethylene ChloroTriFluoroEthylene) therefore the compromise transparency in the visible, mechanical resistance to winding, durability UV (with suitable charge) and coatability after suitable surface treatment makes it a candidate of choice. Of course, the material of said film is not limited to the above examples and other materials are possible.

This film can have a thickness ranging from 50 μm to approximately 100 μm.

The film of the controllable optical system therefore comprises at least two zones whose optical properties are adjusted by layer deposition. It can be expected to have a multitude of layering configurations of layers in order to be able to satisfy a plurality of situations. Depending on whether you are in a temperate zone or a zone with a warm climate, the needs are different.

To classify these different layers, indices representative of optical properties are calculated.

A first index is the value of the heat transfer coefficient Ug. This Ug value is representative of the heat losses expressed by the Ug value in W / m2K. The smaller the number, the better the insulation.

A second index is the value g which indicates its capacity to let through the energy of the solar radiation. The higher the g value, the greater the gain in terms of radiation and heat.

A third index is the value TL which represents the Light Transmission (TL), this value indicates in% the quantity of light transmitted through a glazing. The higher it is, the better the passage of light, which will reduce the consumption of electric lighting and give more comfort to the home. Conversely, a transmission coating of less than 0.1% can provide a privacy function (in the same way as a blind). This variation in light transmission can be obtained by a more or less opaque variable coating. Such a coating can be produced using a plurality of lines. These lines are arranged for alternating with transparent zones. The variation of the light transmission is thus made by modifying the width of the lines and the transparent zones between them. The light transmission will decrease if the ratio between the width of the transparent zones on the width of the lines decreases. Consequently, it is then possible to adapt its indices according to the configuration and the desired situation.

Summer comfort Winter comfort remarks Ug = 1, g = 36 Ug = 1.1, g = 63 Intermediate climate Ug = 0.7, g = 40 Ug = 0.7, g = 60 Cold to intermediate climate Ug = 1, g = 0.39 without sun direct Ug = 1, g = 0.6 To avoid overheating by summer from a veranda roof T1 = 9%; TE = 9% T1 = 76%; g = 0.6 Anti-glare summer

The thin layers used generally include silver, titanium, silicon nitride, zinc oxide, but not only titanium oxide.

Given the relative positioning of the optical film 52 in the cavity and the drum arrangement, the plastic film is not in the middle of the cavity but close to one of the panes of the glazing. If we want to promote an active behavior in terms of reduction of the solar factor, it is better to put the film 52 near the outer window 2a and the layer Ci on the face of the film 52 facing the outer window 2a. On the contrary, if we want to promote an active behavior in terms of thermal transfer Ug, it is better to put the film 52 close to the inner window 2b and the layer Ci on the face of the film 52 facing the inner window 2b.

In a second embodiment visible in Figures 11 and 12, the glazing 1 comprises a second controllable optical system 5. This second controllable optical system also includes two winders 51 in the intermediate space 4 on opposite sides of said glazing 1 other than those used for a first controllable optical system. It is therefore understood that if the first controllable optical system 5 has its reels arranged horizontally, the second controllable optical system 5 has its reels arranged vertically.

The controllable optical system 5 also comprises an optical film, as described above, fixed to the reels 51.

It is therefore understood that the film of the first controllable optical system 5 and the film 52 of the second controllable optical system 5 overlap.

The first advantage of this second embodiment is that it makes it possible to increase the number of zones 53 with distinct optical properties without increasing the thickness. Indeed, with a single system, it would be possible to increase the number of zones 53, the system being designed so that the film 52 is wound on one and / or the other of the reels. However, the more surface there is to be wound, the greater the thickness of the reel 51 and of the film 52 wound. The thickness of the intermediate space 4 must therefore be adjusted.

With two controllable optical systems 5, it is possible to increase the number of zones 53 with distinct optical properties by distributing them over the two controllable optical systems 5. Consequently, the thickness of the reel and of the film associated with it does not not vary.

Another advantage of having two controllable optical systems is to allow greater reactivity in operation. Indeed, if we increase the number of zones 53 with distinct optical properties, it becomes longer to pass from a zone located at a first end of the film to a zone 53 situated at a second end of the film 52. With a distribution of the zones 53 with distinct optical properties on two controllable optical systems 5, the two systems can wind and unwind the films 52 at the same time optimizing the changeover time.

Finally, this configuration with two controllable optical systems 5 can make it possible to combine, to associate different zones with distinct optical properties and to obtain a specific combination.

This possibility of having two controllable optical systems 5 can be combined with triple glazing as seen in FIG. 13. Such glazing comprises three sheets of glass 2a, 2b, 2c and two cavities. An inner glass sheet is therefore obtained, an outer glass sheet and a central glass sheet 2c, the central glass sheet being separated from the outer glass sheet by a cavity and from the inner glass sheet by a cavity. In at least one of the cavities, a controllable optical system according to the invention is arranged.

It is possible to have a controllable optical system 5 in each cavity.

Furthermore, it can be advantageously provided that the glazing according to the invention is integrated into an automated environment. In this case, the external interface unit 54c is associated with a calculation unit and with at least one sensor, see a plurality of sensors such as brightness or temperature sensors for example. Therefore, depending on the measurements delivered by the sensor (s), the calculation unit generates a control signal for the external interface unit 54c. This control signal can be transported by wired or wireless means such as Wi-Fi.

Of course, the present invention is not limited to the illustrated example but is susceptible to various variants and modifications which will appear to those skilled in the art.

Thus, provision may be made for the film 52 to be composed of several parts, each part carrying an area having its own optical characteristic. These different parts are thus fixed to each other for example by welding.

These different parts can be made of the same material or in different materials.

Claims (14)

1. Glazing (1) comprising at least two transparent sheets (2a, 2b) connected at their edge by a frame 5 (3), and delimiting between them a first intermediate space (4), a first controllable optical system (5) arranged in said intermediate space, a first control system (54) enabling the first controllable optical system to be set in motion in a first direction, characterized in that said first controllable optical system (5) comprises at least one pair of winders ( 51) arranged parallel to a second direction orthogonal to the first direction, on two opposite sides of said glazing, and a film (52) arranged to be wound on at least one of said winders, the rotation of at least one of said winders allowing the displacement of said film in the plane of 15 glazing, and in that said film is arranged to comprise at least two distinct zones (53) each extending over the entire extent of said film in the second direction and each having different optical properties. 2. Glazing according to claim 1, characterized in that the film (52) has a length which is at least equal to a multiple of the distance between the two 20 reels (51), said multiple being equal to the number of separate zones (53). 3. Glazing according to one of the preceding claims, characterized in that each zone (53) distinct from the film comprises at least one optical layer (Ci) making it possible to modify the light flux passing through said distinct zone. 4. glazing according to one of the preceding claims, characterized in that it comprises three transparent sheets (2a, 2b, 2c) connected at their edge by a frame (3) arranged to delimit a first intermediate space and a second space interlayer, said first controllable optical system (5) being arranged in said first interlayer space. 5. glazing according to one of the preceding claims, characterized in that it further comprises a second controllable optical system (5) arranged in said first intermediate space controlled by a second control system, said second controllable optical system comprising a pair of winders arranged in parallel on two opposite sides of said glazing, different from the opposite sides used for the first controllable optical system, and a film mechanically connecting said winders. 6. glazing according to claim 4, characterized in that it further comprises a second controllable optical system (5) arranged in the second space 5 intermediate and controlled by a second control system, said second controllable optical system comprising a pair of reels arranged in parallel on two opposite sides of said glazing and a film mechanically connecting said reels. 7. glazing according to one of the preceding claims, characterized in that the control means (54) are mechanical. 8. glazing according to claim 7, characterized in that the control means (54) comprise two toothed wheels (54A) each associated with a reel (51) and a drive chain (54B) used to mechanically connect the two reels via the gear wheels, the control means comprising at In addition to an interface means (54C) comprising a control rod (54D) associated with a gear system (54E) connected to one of the gear wheels of the reels making it possible to transmit the rotational movement of the rod on it - even to the gear wheel to which the gear system is connected. 9. glazing according to one of claims 1 to 6, characterized in that the 20 control means (54) are electro-mechanical. 10. glazing according to claim 9, characterized in that the control means (54) comprise at least one electric motor (54a) associated with one of the winders (51) and controlled by a control unit (54b) connected to an outdoor interface unit (54c). 25 11. glazing according to claim 10, characterized in that the connection between said control unit and said external interface unit is wired. 12. glazing according to claim 10, characterized in that the connection between said control unit and said external interface unit is wireless. 13. glazing according to one of claims 10 to 12, characterized in that said electric motor and a control unit are magnetically connected. 14 System comprising at least one glazing unit according to one of claims 9 to 13, said system further comprising a calculation unit connected to at least one sensor, said calculation unit being arranged to receive data representative of at least one measurement operated by said sensor and for processing its data in order to generate a control signal sent to the control means (54) of said glazing. 1/4 2/4 Fig. 4a 53 b -'- y 1 53 53 ................. Z Z \ / \ / f \ Z \ A Z, Z. zZ '~ -Z --s' v- X ji / / / / ' / _z ^z '> ^Z X' Z. ZZZ / Z. z r A X'Z Xj 52 Fig. 4b This H c ₂ L— ¢ 3 f k.rr.A X.n-J 53 ⁵³ 53 51 54a 4/4