Glazing with a vision system comprising a light source and a separate optical device, and plate for this glazing

Abstract

The invention relates to a glazing (1) for a motor vehicle comprising: - a glazed element (10) having an outer face (11) and an inner face (12); - at least one plate (80) having a body (85), the plate (80) having a housing (83) for the reversible attachment of an infrared vision system (7) having a field of view to an inner face (82) of the plate (80); - an infrared vision system (7) having a field of view and comprising a light source; - and an optical device (9) located between the light source (71) and the outer face (11) of the glazed element (10), the optical device (9) being located at a distance between the light source and the inner face (12) of the glazed element (10).

Description

VISION SYSTEM GLAZING COMPRISING A SEPARATE LIGHT SOURCE AND OPTICAL DEVICE, AND A PLATINUM FOR THIS GLAZING Scope of the invention

[0001] The present invention relates to a vehicle glazing comprising: - a glazed element having an outer face and an inner face, - at least one plate having a body, said plate having an outer face which is fixed opposite said inner face of the glazed element, an inner face and a housing for the reversible attachment (directly or indirectly via an intermediate support) of an infrared field vision system to said inner face of the plate, - a field vision system comprising a light source and a detection device, - an optical device which is separate from the field vision system and which is located between said light source and said outer face of the glazed element.

[0002] The present invention thus relates to a plate for the reversible attachment of the infrared vision system. State of the art

[0003] Laser remote sensing (LIDAR or lidar), an acronym for the English expression "light detection and ranging" or "laser detection and ranging" (or in French "détection et estimation de la distance par la lumière" or "par laser"), is being considered for road vehicles, especially autonomous ones, to improve safety.

[0004] Recently, it has been proposed to place a lidar behind the windshield of a road vehicle to protect it from external conditions. However, this placement behind the windshield presents several challenges. The lidar is typically installed in the upper part of the passenger compartment (the upper area of ​​the windshield) so that the beams emitted outwards by the light source and received from the outside by the lidar detection device pass through the glass near its upper longitudinal edge. Firstly, the lidar is quite bulky and must be positioned so as not to obstruct the driver's view. Secondly, the lidar generates a near-infrared beam within a field of view with a wide vertical and horizontal angle.Projecting the emission beam onto the glazing requires reserving an area of ​​the glazing for the transmission of this near-infrared emission beam (called the near-infrared transmission window).

[0005] In practice, the manufacturer of the LIDAR expects that the beam emitted by the lidar presents a given vertical and horizontal field of view having a given cross-section around a median direction of pointing.

[0006] Document WO 2023 / 274854 describes a road vehicle glazing with a lidar in the passenger compartment and a prism—an optical device—placed on the inner main surface of the glazing to increase the vertical aperture of the lidar's field of view outside the vehicle. However, while this prism does allow adjustment of the angular aperture of the glazing in the vertical direction, it alters the cross-section of the field of view at the glazing's exit.

[0007] A glazing with an internal optical device is proposed, increasing the field of view of the internal lidar, whose optical device is positioned inside (i.e., further inside than the inner face of the glazed element) with precision relative to the glazed element, in a reliable manner over time, without increasing, and preferably even reducing, the space required for this positioning.

[0008] The present invention thus relates to a vehicle glazing according to claim 1. The glazing according to the invention comprises: - a glazed element having an outer face and an inner face, - at least one plate having a body (preferably made of plastic), said plate having an outer face which is fixed opposite said inner face of the glazed element, an inner face and a housing for the reversible attachment (directly or indirectly via an intermediate support) of an infrared vision system with a field of view to said inner face of the plate, - an infrared vision system with a field of view comprising a light source and a detection device, - an optical device located between said light source and said outer face of the glazed element, said optical device being located at a distance between said light source and said inner face of the glazed element.

[0009] The optical device is not an opaque shutter; it is a device that increases the field of view of the infrared vision system. The optical device is separate from the field-of-view infrared vision system.

[0010] The said optical device is thus reversibly attached, or fixed, in a manner that is both precise, reliable and compact, inside the passenger compartment.

[0011] The said optical device is reversibly attached, or fixed: a- directly to an intermediate support reversibly attaching said infrared field of vision system to said inner face of the plate, or a'- indirectly via an attachment element to an intermediate support reversibly attaching said infrared field of vision system to said inner face of the plate, or b- directly to said plate, or c- to said inner face of the glazed element by a base.

[0012] The present invention is advantageously complemented by the following features, taken individually or in any of their technically possible combinations: - said optical device comprises at least one lens or prismatic element, the lens or prismatic element having a first surface, called the rear surface, oriented towards the infrared vision system with a field of view and a second surface, opposite the first surface, oriented outwards, called the front surface, the first surface being disposed at a distance from the infrared vision system with a field of view to receive an emission beam emitted by said light source, the second surface being disposed at a distance from said inner face of the glazed element, to transmit the emission beam,the lens or prismatic element being arranged and configured so that a vertical angular opening of an external field of view is greater than a vertical angular opening of a source field of view and, preferably, so that a horizontal angular opening of the external field of view is greater than a horizontal angular opening of the source field of view; - said body is made of a plastic material having a Young's modulus between 10 and 20,000 MPa, preferably between 5,000 and 20,000 MPa; - said plate and said base are fixed to said inner face of the glazed element by a single adhesive material.

[0013] Another aspect of the invention is a plate for a glazing according to the invention, said plate having a body (preferably made of plastic), said plate having an outer face which is intended to be fixed opposite said inner face of the glazed element, an inner face and a housing for the reversible attachment (directly or indirectly via an intermediate support) of said infrared vision system to said inner face of the plate. Description of the figures

[0014] Other features, purposes and advantages of the invention will become apparent from the following description, which is illustrative and not limiting, and which should be read in conjunction with the accompanying drawings on which:

[0015] - illustrates a glazing according to the invention, seen from outside space and by transparency through the glazed element and the opaque layer.

[0016] - illustrates a partial and exploded view of the glazing of the.

[0017] - illustrates schematically, a vertical cross-sectional view along a characteristic plane, of a vehicle window according to the invention, with an internal lidar infrared vision system and an internal optical device.

[0018] - illustrates schematically, a horizontal cross-sectional view along a plane perpendicular to the characteristic plane, of the vehicle glazing.

[0019] - illustrates a partial schematic view, in perspective, of a first variant of the invention in which the optical device is reversibly attached, indirectly via an attachment element, to an intermediate support reversibly attaching the infrared field vision system to the plate.

[0020] - a partial schematic view, in perspective, of a second variant of the invention in which the optical device is reversibly attached directly to the plate.

[0021] - illustrates a partial schematic view, in perspective, of a third variant of the invention in which the optical device is attached to the inner face of the glazed element by a base.

[0022] - illustrates a partial schematic, perspective view of a fourth variant in which the optical device is attached directly to the field-of-view infrared vision system.

[0023] Throughout the figures, similar elements are given identical references. The proportions between the different elements are maintained in each figure, and background elements are generally not shown to facilitate their interpretation. Definitions

[0024] For the purposes of this invention, "fastener" or "attachment" refers to mechanical fasteners, which are attached and detached manually or with the aid of a mechanical tool. The attached element is thus in a fixed position. For the purposes of this invention, "fixation" refers to chemical fixations, which cause irreversible molecular changes, unless the bond is broken and the plate is rendered unusable. Each of these two terms is mutually exclusive.

[0025] The terms "interior" and "exterior" are understood to describe parts of the support considered in the position of installation of the support in its final destination, that is to say fixed against an interior face of a glazed element of a vehicle glazing itself installed in a body bay of the vehicle, the term "interior" describing a part facing towards the interior of the vehicle while "exterior" describing a part facing the exterior of the vehicle.

[0026] The notion of "based on plastic material" means that the essential constituent of the material constituting the element (the plate, the base) is plastic material; it aims to cover that this plastic material can be reinforced, for example by mixing in reinforcing fibers and in particular glass fibers; but excludes that the material constituting the element (the plate, the base) may itself be metallic, that is to say, made of metal or metallic alloy. Detailed description of the invention

[0027] With reference to figures 1 to 4, a vehicle glazing 1 comprises a glazed element 10 and at least one plate 80 for the reversible attachment of an infrared vision system 7 with field of view to the plate 80 and which is fixed to the glazed element 10.

[0028] Glazing unit 1 can be selected from a windshield, a rear window, and a side window assembly of a vehicle. The vehicle can be a car, a train, and / or an aircraft. With reference to the [reference to relevant document], glazing unit 1 is preferably a windshield of a motor vehicle.

[0029] The glazing 1 is intended to close an opening creating a separation between an interior space of the vehicle I and an exterior space of the vehicle E. The glazed element 10 thus has an exterior face 11 intended to be turned towards the exterior space E, an interior face, intended to be turned towards the interior space I, as well as a peripheral edge 18 located between these two faces.

[0030] The glazed element can be monolithic, meaning it consists of a single sheet of material, or composite, meaning it consists of several sheets of material with at least one bonding layer inserted between them, as is the case with laminated glazing / glazing elements. The sheet(s) of material can be mineral, particularly glass, or organic, particularly plastic.

[0031] The glazed element 10 has a lower longitudinal edge 13, a left lateral edge 14, a top longitudinal edge 15, and a right lateral edge 16. The terms "left" and "right" here refer to the central axis of forward movement of the vehicle.

[0032] In the case of vehicle glazing, the glazing generally has at least partially around its periphery, all around the edge of the inner face, an ornamental band 4. This ornamental band generally results from an enamel deposit, made on the inner face of the glazed element when it is monolithic or on an intermediate face of the glazing for composite glazing, but it can also result from a partial and / or peripheral coloring of a sheet of material used, in particular a sheet of organic material.

[0033] When the glazed element is made of organic material, it was manufactured prior to the implementation of the invention by molding the material constituting the glazed element in a molding device comprising a mold having at least one fixed mold portion and one movable mold portion that is movable relative to the fixed mold portion. These mold portions cooperate in the closed state of the mold, during the molding step, to form a mold cavity having, in cross-section, the shape of the glazed element. Often, the glazed element made of organic material is not flat but convex.

[0034] When the glazed element is made of mineral material, it was manufactured prior to the implementation of the invention by melting mineral material into a flat sheet, then by cutting this sheet and possibly curving and / or tempering this sheet.

[0035] When the glazed element is a composite glazed element, it has been manufactured according to the well-known technique of manufacturing multiple panes of glass or laminated, curved panes of glass.

[0036] In figures 1 and 2, the glazed element 10 is a curved, laminated glass. Here it is a windshield of a motor vehicle.

[0037] The plate 8 has on the one hand an outer face 81 intended to be turned towards the outer space E and which is intended to be fixed indirectly to the inner face 11 of the glazed element opposite this inner face 11 of the glazed element and on the other hand an inner face 82, intended to be turned towards the inner space I.

[0038] The plate 80 has a body 85, preferably made of plastic material and a housing 83 for the reversible attachment, directly or indirectly via an intermediate support 8, of the infrared vision system 7 with field of vision to the inner face 82 of the plate 80.

[0039] The plate 8 has a housing 83 for the reversible attachment of an infrared vision system 7 with field of view, with optical aiming towards the outside space E. This housing has at least one hole or recess 89 for the passage of the external field of view FOV2, of the infrared vision system 7 with field of view, which can thus be oriented towards the outside space E.

[0040] Plate 80 may also have a housing (not shown) for the reversible attachment of a camera with a visible field of view. Plate 80 may have other housings for the reversible attachment of other accessories, such as a rain sensor, to the glazing element; this housing may have a hole for the passage of part of this accessory.

[0041] Plate 80 may also have a means (not shown) for the reversible attachment of another accessory, inside, and comprising a reversible attachment interface by clipping, or by stapling, or by slipping, or by quarter turn and which preferably constitutes a reversible attachment interface for an interior rearview mirror base or an interior viewing screen.

[0042] The infrared vision system 7 with field of view includes a light source 71 and a detection device 72.

[0043] The glazing 1 also includes an optical device 9 located between the light source 71 and the outer face 11 of the glazed element 10, the operation of which is detailed later.

[0044] In Figures 3 and 4, a portion of the glazing 1 is shown in a characteristic plane, with the glazing element 10 having: the outer face 11 (F1) and the inner face 12 (F4 if the glazing element is laminated, or F2 if the glazing element is monolithic). For clarity, the vehicle is assumed to be on a level surface. The lateral (or transverse) section plane is thus taken perpendicular to the longitudinal axis (at the upper longitudinal edge 15 and the lower longitudinal edge 13 of the glazing if straight). An orthonormal coordinate system XYZ is shown, in which the Z-axis is vertical, the X and Y axes are horizontal, and the Y-axis lies in the lateral section plane. The lateral section plane includes a normal 15° to the glazing and a vertical Z-axis within the vehicle. The positive direction of the angles used in this disclosure is also shown.Advantageously, the cutting plane passes through the middle of the upper longitudinal edge 15 of the glazing and is a plane of symmetry of the glazing.

[0045] For clarity, Figures 3 and 4 depict a flat pane of glass. However, the glass may have at least one radius of curvature, making it curved. Let e ​​be the thickness of the glass element 10. The thickness e is generally less than or equal to 1 cm, for example 9 mm, 8 mm, 7 mm, 6 mm, preferably at most 5 mm.

[0046] The glazing 1 is installed, or intended to be installed, on a vehicle at an angle of inclination, denoted β, with a horizontal axis in the characteristic plane under consideration. For clarity, the vehicle is assumed to be on level ground. The angle of inclination β is greater than 0 degrees and less than 90 degrees, and at most 60 degrees, generally between 15 and 20 degrees and preferably between 20 and 50 degrees, for example, 23 or 30 degrees for a motor vehicle windshield. As mentioned above, the angle of inclination β has a sign, which is positive here. The angle of inclination can be close to 90 degrees, notably between 70 and 89 degrees for truck or public transport glazing (e.g., bus).

[0047] The lateral section plane of the glazing includes a normal 150 to the glazing and a vertical axis Z in the vehicle. The lateral section plane preferably passes through the midpoint of the upper longitudinal edge 15 and the midpoint of the lower longitudinal edge 13. The characteristic plane of the glazing, for its part, includes the normal 150 to the glazing and a vertical axis (Z) in the vehicle.

[0048] An infrared vision system 7 here a lidar inside the vehicle's passenger compartment, spaced and behind the glazed element 10, laminated.

[0049] As is known, the infrared vision system 7 comprises a light source 71 and a detection device 72. The light source 71 is arranged and configured to generate an emission beam 70 in the near-infrared. The emission beam 70 is emitted at a working wavelength, LB1, within a spectral range from 800 nm to 1800 nm, in particular from 850 nm to 1600 nm, specifically 905 ± 30 nm and / or 1550 ± 30 nm. The detection device 72 is arranged next to the light source 71 and configured to detect reflected radiation in at least a portion of the lidar's field of view outside the vehicle. The detection device 72 is generally oriented parallel to the light source 71.Depending on the type of lidar used, the emission beam 70 is emitted in a direction that is scanned in two transverse dimensions, or the emission beam 70 extends along a sheet that is scanned in a single direction transverse to the sheet, or the emission beam 70 is of the flash type and does not use scanning. With or without scanning, the emission beam 70 from the light source 71 extends over a source field of view having a vertical angular aperture, called VFOV1, and an internal horizontal angular aperture, called HFOV1, as given. The source field of view presents, for example, a rectangular cross-section in a plane perpendicular to a median direction pointed 40 to the emission beam 70. The vertical angular aperture VFOV1 ranges from 2 to 15 degrees, preferably less than 10 degrees, for example, 7 degrees. The internal horizontal angular opening HFOV1 ranges from 10 to 25 degrees, preferably less than 20 degrees, for example 17 degrees.In this document, the lidar reference beam is defined as the beam corresponding to the intersection of the emitting beam 70 and the reflected beam. The lidar reference plane comprises the median direction with point 40 and a vertical axis (Z). Preferably, the lidar reference plane coincides with the characteristic plane of the glazing.

[0050] Figure 1 illustrates the infrared vision system 7 positioned behind the glazing forming the windshield of a motor vehicle, facing an area, here called the near-infrared transmission window 111, which is preferably located in the central and upper part of the windshield. The transmission window 111 is transparent to the emission beam of the infrared vision system 7. Within this window 111, the infrared vision system is oriented at a certain angle of incidence with respect to the surface of the windshield, specifically the inner face 12 of the glazing element 10. In this example, the transmission window 111 is separated from the upper edge 15 of the glazing by the masking layer 4.

[0051] Advantageously, at least in the near-infrared transmission window, the glass sheet(s) are transparent in the near-infrared, as described for example in patent documents WO2018015312 and / or WO2018178278.

[0052] The glazing system includes an optical device 9, separate from the infrared vision system and arranged on an optical path of the emission beam 70 emitted by the lidar.

[0053] According to this disclosure, the optical device comprises a lens 20. The lens 20 has a first surface 21, referred to as the rear surface or face A, shown figuratively here in the passenger compartment, and a second surface 22, opposite the first surface 21. The second surface 22, referred to as the front surface or face B, shown figuratively, is oriented outwards. The lens 20 preferably operates in free space. The lens 20 is preferably a single piece. The lens 20 comprises, for example, an optical lens. The lens 20 is, for example, made of one of the following materials: PMMA (polymethyl methacrylate), preferably extra-clear glass. The lens 20 has, in particular, a refractive index of 1.48 at the working wavelength LB1 in the case of PMMA. The lens 20 has, for example, a thickness at its center of between 1 cm and 4 cm.

[0054] The lens 20 is arranged in the reference plane of the lidar to receive the emission beam 70 emitted by the lidar 7. For example, the lens 20 is arranged on the median direction of the pointing 40 of the light source 71. Alternatively, one or more optical components are arranged between the light source 71 and the lens 20 so as to redirect the emission beam towards the lens 20.

[0055] In one application, lens 20 also allows the median direction of the beam 45 to be modified. The redirection device is preferably positioned between the lidar and lens 20. In this case, the lidar can, for example, advantageously point downwards to reduce the footprint of the stage 80.

[0056] The first surface 21 is positioned at a distance from the infrared vision system 7 with field of vision to receive the emission beam 70 emitted by the light source 71 and the second surface 22 is positioned at a distance from the inner face 12 of the glazed element 1), to transmit the emission beam 70.

[0057] Since the lens is external to the LiDAR and at a distance from the glass element (which may have a hole, with the lens positioned opposite this hole, or even partially or entirely within the hole), an origin point O1 of the first surface at the intersection of the optical axis of the converging lens is placed at a distance d1 from the LiDAR light source (real or virtual source, i.e., the point from which the rays emerging from the LiDAR appear to originate). The distance d1 is preferably at most 150 mm, and even within a range of 20 mm to 150 mm.

[0058] Since the lens is external to the lidar and at a distance from the glazed element (which may have a hole, with the lens positioned opposite this hole), an origin point O2 of the second surface is placed at a distance d2 from the inner face of the glazed element (F2 or F4). The lens is positioned opposite this inner face, or the lens is at a distance d2 from the hole (partial or through) in the glazed element. Preferably, the lens is positioned to minimize the distance d 2. The distance d2 is measured along the longitudinal optical axis of the lens. Preferably, the distance d2 is at most 100 mm and can even range from 10 to 100 mm. This minimization of the distance d2 reduces the size of the lidar system and the optical device 9.

[0059] The lens 20, or prismatic element, is arranged and configured so that the vertical angular aperture VFOV2 of the external field of view is greater than a vertical angular aperture VFOV1 of the source field of view and, preferably, so that the horizontal angular aperture HFOV2 of the external field of view is greater than the horizontal angular aperture HFOV1 of the source field of view.

[0060] With reference to figures 5 to 8, the optical device 9 is reversibly attached, or fixed, according to one of the following solutions a, a', b, c or d: - Solution a, the optical device 9 is reversibly attached, or fixed, directly to an intermediate support 8 reversibly attaching the infrared vision system 7 with field of vision to the inner face 82 of the plate 80; - Solution a', the optical device 9 is reversibly attached, or fixed, indirectly via an attachment element 54, to an intermediate support 8 reversibly attaching the infrared vision system 7 with field of vision to the inner face 82 of the plate 80, as illustrated in;- Solution b, the optical device 9 is reversibly attached, or fixed, directly to the plate 80, as illustrated in,-- Solution c, the optical device 9 is reversibly attached, or fixed, to the inner face 12 of the glass element 10 by a base 5, as illustrated in, this base 5 being materially separated from the plate 80.;

[0061] There is also a solution d in which the optical device 9 is reversibly attached, or fixed, directly to the infrared vision system 7 with field of view, as illustrated in.

[0062] In solution a', the attachment element 54 can in particular attach the optical device 9 by two opposite lateral sides, or even in addition by a side located below the optical device 9; preferably, the attachment element 54 does not attach the optical device 9 from above, so as not to risk coming into contact with the inner face 12 of the glazed element.

[0063] The mounting plate 80, and the base 5 if present, can be fixed to the inner face 11 of the glazed element by two separate adhesive materials; they can also be fixed by the same adhesive material. This material, or these materials, can be double-sided tape or an adhesive.

[0064] Of course, this adhesive material is placed against the outer face of the plate and the base in such a way that the recesses or holes of each of these two means which serve their operation are empty of adhesive material.

[0065] The plastic material of the body 85 of the plate 80 has a Young's modulus between 10,000 and 20,000 MPa, preferably between 5,000 and 20,000 MPa. The plastic material of the optional base 5 has a Young's modulus between 10,000 and 20,000 MPa, preferably between 5,000 and 20,000 MPa.

[0066] The plastic material of the body of the turntable 80 and the plastic material of the base 5 can each be polyamide-based. The turntable 80 and the optional base 5 can (or may) be, for example, made of polyamide, such as PA66; it (or they) can be, for example, made of PA66 / PBT (PBT for: polyethylene terephthalate) which has a Young's modulus of approximately 700 MPa.

[0067] The turntable 80 and the optional base 5 can be made of, for example, polycarbonate (PC), polybutylene terephthalate (PBT), acrylonitrile butadiene styrene (ABS), or acrylonitrile styrene acrylate (ASA); they can, for example, be made of PC / PBT or PBT / ASA. The plastic material of the turntable body 3 and the plastic material of the base 5 can each be reinforced, for example, with fiberglass or glass beads.

[0068] It is also possible that the 80 plate includes elements for the reversible attachment of an inner cover.

[0069] The glazing according to the invention may include accessories which are attached by means of the plate and possibly the base if present.

Claims

Vehicle glazing (1) comprising: - a glazed element (10) having an outer face (11) and an inner face (12), - at least one plate (80) having a body (85), said plate (80) having an outer face (81) which is fixed opposite said inner face (12) of the glazed element (10), an inner face (82) and a housing (83) for the reversible attachment of an infrared vision system (7) with a field of vision to said inner face (82) of the plate (80), - an infrared vision system (7) with a field of vision comprising a light source (71) and a detection device (72), - an optical device (9) located between said light source (71) and said outer face (11) of the glazed element (10), characterized in that said optical device (9) is located at a distance between said light source (71) and said inner face (12) of the glazed element (10), and in which said optical device (9) is reversibly attached,or fixed: a- directly to an intermediate support (8) reversibly attaching said infrared vision system (7) with field of vision to said inner face (82) of the plate (80), or a'- indirectly via an attachment element (54) to an intermediate support (8) reversibly attaching said infrared vision system (7) with field of vision to said inner face (82) of the plate (80), or b- directly to said plate (80), or c- to said inner face (12) of the glazed element (10) by means of a base (5). Glazing (1) according to claim 1, wherein said optical device (9) comprises at least one lens (20) or prismatic element, the lens (20) or prismatic element having a first surface (21), referred to as the rear surface, oriented towards the field-of-view infrared vision system (7) and a second surface (22), opposite the first surface, oriented outwards, referred to as the front surface, the first surface (21) being disposed at a distance from the field-of-view infrared vision system (7) to receive an emission beam (70) emitted by said light source (71), the second surface (22) being disposed at a distance from said inner face (12) of the glazing element (10) to transmit the emission beam (70), the lens (20) or prismatic element being arranged and configured such that a vertical angular aperture (VFOV2) of an external field of view is greater than a vertical angular aperture (VFOV1) of a source field of view And,preferably, so that the horizontal angular aperture (HFOV2) of the external field of view is greater than the horizontal angular aperture (HFOV1) of the source field of view. Glazing (1) according to any one of claims 1 or 2, wherein said body (85) is based on plastic material having a Young's modulus between 10 and 20,000 MPa, preferably between 5,000 and 20,000 MPa. Glazing (1) according to any one of claims 1 to 3, wherein said plate (80) and said base (5) are fixed to said inner face (12) of the glazed element (10) by a single adhesive material. Plate (80) for a glazing (1) according to any one of claims 1 to 4, characterized in that said plate (80) having a body (85), said plate (80) has an outer face (81) which is intended to be fixed opposite said inner face (12) of the glazed element (10), an inner face (82) and a housing (83) for the reversible attachment of said infrared vision system (7) to said inner face (82) of the plate (80).

Images