WO2017153675A1

WO2017153675A1 - Terminal for 360° observation of immersive contents, including a curved facial interface with asymmetric protrusion

Info

Publication number: WO2017153675A1
Application number: PCT/FR2017/050503
Authority: WO
Inventors: Basile SEGALEN; Adrien SADAKA; Guillaume POLVÉ
Original assignee: Timescope
Priority date: 2016-03-08
Filing date: 2017-03-07
Publication date: 2017-09-14
Also published as: FR3048787A1; FR3048787B1

Abstract

The invention relates to a terminal (1) including: a pedestal (3) suitable for being fastened to the ground; and a facial interface (10) borne by the pedestal, the facial interface comprising at least one observing zone (22a, 22b) that is suitable for allowing a user to observe through the facial interface. The facial interface includes a protrusion (23, 24) of asymmetric shape, formed along at least one first portion of outline of the observing zone, which in particular extends continuously from an upper portion to a lower portion while passing through a laterally exterior portion. Such a terminal is particularly suitable for 360° viewing of virtual-reality contents relating to various eras of an environment in which the terminal is installed.

Description

360 ° immersive content viewing terminal with curved facial interface and asymmetrical projection.

[001] Technical domain

[002] The invention relates to the field of observation devices, and more specifically to terminals intended to observe one or more points of interest of an environment such as landscapes, architectural infrastructures, monuments or artistic works.

[003] State of the art

[004] On tourist and historical sites, observation devices are often installed to offer visitors to observe in more detail the points of interest of the site (a historic building or a panorama for example).

[005] These observation devices can take the form of a terminal comprising an observation system through which a user obtains additional features to visit the site.

[006] A well-known feature includes providing an enlarged view. The enlarged view allows the visitor, without moving, to observe in more detail the point of interest of the site from where the terminal is installed.

[007] Another feature may be to provide access to augmented reality services. The terminal then allows the user to observe the real environment of the site, enriched by augmented reality content such as:

- cultural information relating to the point of interest or other elements of the site,

- archive images about the site,

- videos illustrating the historical events that took place on the site,

- advertising content, or other.

[008] Another feature uses a screen embedded by the terminal to display virtual reality content. These contents may be computer-generated images, videos and / or sounds to display on-screen an immersive computer simulation, visual and sound, real or imaginary environments.

[009] For example, the virtual content displayed by the terminal can be a virtual environment designed computerically from plans of a real environment in which the terminal is installed, archive images, engravings or drawings of this environment. The virtual environment thus makes it possible to virtually reconstruct the real environment as it was, or as it may be, at a given time (past or future) and to add any type of complementary content (simulation of construction , information about displayed objects, service proposal, etc.). Through the terminal, the user can thus navigate in a virtual environment more or less faithful to the real environment in a past, present or future time.

[010] Whatever the features offered by the terminal, the best observation experiences for a user are those where he feels completely immersed in the environment that he can observe via the terminal. The most immersive visualizations are those for which the user has the impression to contemplate an environment (real or virtual) of his own eyes (without observation device) while he observes this environment through the terminal. Thus, the user has a vision through the terminal that is confusing with that of reality (feeling of immersion), while also benefiting from the aforementioned functionalities.

[011] Now, the observation posts are often installed outdoors. They are therefore exposed to lighting conditions that can be high. Under these conditions, the outside light can disturb the user of the terminal, especially at the interface between the terminal and its face. Indeed, if external light infiltrates at this terminal-face interface, the light conditions are deteriorated during observation via the terminal (ie generation of light pollution), so that the user feels a difference between the observation conditions with or without the bound. The perception of this difference by the user degrades, or even prevents to obtain, the sensation of immersion in the environment observed via the terminal.

[012] The Timescope company was created in July 2015, with the aim of developing self-service virtual reality experiences. This development required a major research and development phase, including the development of several digital or physical prototypes.

[013] A prototype has also been the subject of a model filing on 14/09/2015 under the number 20154389. The document Sylvain Tronchet, "Culture - Leisure", France Blue from the internet https: //www.franeebleu. nfos / ^

soon-in-the-streets-of-paris-1452863366 is contemporary of this prototype.

[014] As another example, the document WO0195290 discloses a terminal offering virtual reality services to observe an environment. The proposed terminal comprises a terminal-face interface comprising two cylinders intended to cooperate with the face of the user (shape similar to that of binoculars). With such an interface, only certain face morphologies cooperate properly with the contour of the section of the cylinders. For other morphologies, the external light is not completely obscured. It turns out that a large amount of light can then infiltrate between the face and the contour of the section of the cylinders, thereby degrading the feeling of immersion of the user who perceives this infiltration of light. One way to minimize light seepage is then to press his face firmly against the cylinder section. However, this firm support of the face can be unpleasant or painful for the user, thereby degrading the comfort of use of the terminal.

[015] There is therefore a need to improve the existing terminals to provide a good feeling of immersion to users, including through good occultation of external light at the terminal-face interface, to prevent, or at least limit any light pollution.

[016] There is also a need to improve the comfort of use of the terminal at its interface with the face of the user.

[017] The invention improves the current situation in this sense.

[018] Summary of the invention

[019] The object of the invention is to overcome the aforementioned drawbacks by proposing in particular a technical solution which aims to provide a terminal comprising a comfortable facial interface for various face morphologies, and in which the external light infiltrations are minimized, or even completely prevented, so that the user enjoys the most immersive observation experience possible through the terminal.

[020] For this purpose, the invention relates to a terminal comprising:

a foot adapted to be fixed to the ground, and

a facial interface carried by the foot, the facial interface having at least one observation zone adapted to allow a user to observe through the facial interface.

[021] The facial interface is remarkable in that it comprises a projection of asymmetrical shape, formed along at least a first contour portion of the observation zone, in particular continuous from a portion greater than a portion lower through a laterally outer part. Thus, when the user places his face at the observation zone, the asymmetric projection makes it possible to follow the shape of the face and cooperates with it so that at least a portion of the protrusion is in contact with the face. The asymmetrical protrusion maximizes the contact area of the protrusion with the user's face and thus effectively conceals external light while the user uses the terminal to observe the environment in which it is installed.

[022] Furthermore, due to its asymmetrical shape, the projection makes it possible to provide a light concealment even if the user can not completely put his face in contact with the facial interface, for example because he wears glasses. The projection forms a kind of eyecup limiting the infiltration of external light, which thus improves the observation conditions through the terminal even in case of wearing glasses by the user (which can be of different types: small frame of view or large sun setting for example).

[023] Such a terminal is particularly suitable for viewing virtual reality contents relating to different times of an environment in which the terminal is installed, because the display of these contents in the terminal requires controlled light conditions so that the user has a feeling of immersion in the displayed virtual environment. The terminal is also suitable for observing the environment in an enlarged view (image magnification) or the observation of augmented reality content, videos or images.

[024] In a particularly advantageous embodiment, the terminal comprises an interfacing surface with the face of the user surrounding the observation area, the interface surface being of generally curved shape.

[025] The overall curved shape of the interfacing surface allows to marry the general shape of the face. Such a surface thus makes it possible to comfortably accommodate the user's forehead, for example. Furthermore, when the user places his face at the observation area, the interfacing surface, by its generally curved shape, can be brought into contact with the user's face over a wide area of the forehead. This contact zone makes it possible to conceal a significant part of the external light, in particular that which usually infiltrates through the upper part of the terminal-face interface. The curved shape of the interfacing surface also makes it possible to partially obscure the external light usually seeping through the sides or the lower part of the terminal-face interface.

[026] The interfacing surface has in particular a wide zone of cooperation with the front of users having various face morphologies when the overall curved shape of the surface has a radius of curvature of between 110 mm and 250 mm. The The best light concealment results are obtained with a radius of curvature of 135, 145 or 155 mm.

[027] According to a preferred embodiment of the projection, it comprises:

a first portion for facing a first face area of the user above the eye when his eye is facing the viewing area,

a second portion for facing a second face area of the user located below the eye when his eye is facing the viewing area, the first portion having a height less than the second portion.

[028] Such a projection makes it possible to further improve the light concealment at the interface because, when the user observes through the terminal:

the first portion, of height less than the second, is adapted to cooperate and maximize the contact area with a facial area corresponding for example to the arch,

while simultaneously,

the second portion, greater in height than the first portion, is adapted to cooperate and maximize the contact area with an area of the face that may correspond for example to the cheekbone.

[029] The projection thus marries the general morphology of the human face (ie the arch is generally prominent on the face compared to the cheekbone) also improving the feeling of comfort when the user brings his face against the facial interface of the terminal.

[030] Furthermore, the projection may comprise a third portion intended to face a third face area of the user located laterally external to the eye when his eye is facing the observation zone, the third portion of the projection having a height greater than the first portion and the second portion of the projection.

[031] The third portion of the projection improves the occultation of the light coming from a laterally outer side with respect to the observation zone and, with a height greater than that of the first and second portions, matches the lateral outer part. the user's face in relation to the eye (eg the temple).

[032] According to the tests carried out, the best results of occultation of light while maintaining a good feeling of comfort are obtained for:

a height of the first portion of the projection comprised between 1 and 15 mm, and / or a height of the second portion of the projection of between 50 and 20 mm, and / or a height of third portion of the projection of between 10 and 30 mm.

[033] It should be noted that these heights provide good results of occultation and comfort while maintaining a distance between the eye and the observation area which allows a good quality of observation through the terminal (net image), especially if the terminal comprises an optical device through which the user can observe (a lens installed in the terminal for example).

[034] Advantageously, a second contour portion of the observation zone is smooth and follows the generally curved shape of the interfacing surface. This smooth surface makes it possible to cooperate with a zone of the face that can correspond to the top of the nose and to the inter-brow zone. The smooth surface provides a feeling of comfort to the user and allows good contact of the center of the face with its curved shape, further improving the occultation of the external light with this area of the face.

[035] In addition, the terminal may include a recess arranged in the facial interface, the recess being intended to face the nose of the user when his eye is facing the observation area. The user can thus bring his face closer to the facial interface, without having any discomfort in the nose which is received in Γ obviously provided for this purpose when the user manipulates the terminal.

[036] According to an advantageous embodiment, the projection is formed integrally with the facial interface. The projection may for example be formed in one piece with the facial interface by conventional manufacturing techniques for obtaining a single piece (for example by molding or by machining). In this way, the protrusion can not be removed from the facial interface of the terminal, avoiding acts of theft or vandalism.

[037] The terminal may in particular be free of any means of attachment with the user's head. Thus, the interaction of the user with the terminal is simple, consisting only in that the user brings his face against the facial interface and its interfacing surface. The curved shape of the interfacing surface enhances the feeling of immersion of the user during viewing through the terminal without the need for additional fastening means.

[038] In one possible embodiment, the terminal comprises an observation device carried by the foot, the observation device comprising a housing carrying the facial interface. The housing further includes in its interior a screen, the screen being arranged in the observation device to be observed by the user through the observation area of the facial interface.

[039] The screen may allow the user to observe augmented reality or virtual reality content for example. The facial interface being adapted to allow to obtain a better concealment of light than conventional terminals, the user enjoys an improved immersion sensation in the environment that is displayed on the screen.

[040] In addition, the housing of the observation device is opaque in order to prevent the external light from disturbing the light conditions inside the housing, and thus the display of the screen and the feeling of immersion. of the user.

[041] Advantageously, the facial interface is fixed to the housing by means of anti-vandal fixing means.

[042] In addition, the housing may comprise an optical device including at least:

- a lens, and

a transparent protective layer,

the optical device being arranged in the housing between the screen and the viewing area of the facial interface, with the lens on the side of the screen and the transparent protective layer on the side of the viewing area so that when the user observes the screen through the observation area of the facial interface, he observes it via the optical device.

[043] The transparent protective layer provides protection of the lens and the screen placed in the housing, against acts of vandalism. In addition, the transparency of this layer may make it possible not to modify the optical properties provided by the lens to view the screen through the observation zone.

[044] The transparent protective layer can also be sealed (by compression of an O-ring for example between the housing and the transparent protective layer) in the housing to prevent water can penetrate to the inside of the case. This embodiment can in particular be implemented when the terminal is installed outdoors, exposed to any type of weather. [045] Brief description of the figures

[046] Other characteristics and advantages of the invention will appear on examining the detailed description below, and the appended figures in which:

FIG. 1 illustrates an exemplary terminal according to the invention;

FIG. 2 represents an example of a facial interface of the terminal, according to a front view;

FIGS. 3A and 3B show the example of a facial interface respectively in a view from above and a view from below; FIG. 4 illustrates an example of a user's face on which are represented the zones with which the facial interface is adapted to cooperate when the user uses the terminal;

FIG. 5 illustrates a first example of an observation device for the terminal, carrying the face interface and comprising a screen;

Figure 6 illustrates a second example of the observation device.

[047] For the sake of clarity, the dimensions of the various elements shown in these figures are not in proportion to their actual dimensions. In the figures, identical references correspond to identical elements for the various embodiments shown.

[048] Detailed description

[049] Referring firstly to Figure 1 which illustrates an example of terminal 1 comprising: a foot 3 adapted to be fixed to the ground,

a facial interface carried by the foot.

[050] The foot 3 may include for this purpose one or more ground fixing means (such as screws, adhesives, anchor sets, etc.) for installing the terminal in the desired real environment. The terminal is particularly suitable for installation in an outdoor environment, for example to observe a landscape or a monument on a tourist site.

[051] According to one possible embodiment, the facial interface is directly carried by the foot and a user can observe the environment through the facial interface, benefiting for example from an enlargement function ("zoom" function). of the environment observed via the terminal. For this purpose, the facial interface may be associated with an optical image magnification system, located on an opposite face of the facial interface with respect to the face comprising the interfacing surface with the face of the user.

[052] According to a possible embodiment, the facial interface 10 is carried by the foot of the terminal via an observation device 5. As detailed below, the observation device allows for example to embark a screen for providing augmented reality or virtual reality functionality to the user in the environment where the terminal is located.

[053] The terminal can be pivotally mounted over a certain angular range relative to the vertical, for example 360 °. For this purpose, the foot 3 may comprise, for example, a rotary mechanism having a first part fixed to the ground, a second part fixed to the facial interface (through the observation device or not) and a pivot connection allowing rotation about a vertical axis Y, the pivot connection connecting the first part to the ground with the second part.

[054] In addition, the observation device 5 carrying the facial interface 10 can be mounted on the foot 3 via a pivot connection allowing rotation about a horizontal axis X. This pivot connection about a horizontal axis can in particular be made itself to be adjustable in height. That is to say that the position, along a vertical axis, of the horizontal axis of the pivot connection, is adjustable.

[055] When the user manipulates the terminal, it can thus, adjust the height of the observation device, at height of his face in particular, so as to comfortably observe the environment through the terminal, taking advantage of the features offered by the terminal (magnification, augmented reality, virtual reality, etc.). He can also observe the environment on the angular range (for example 360 °) and from top to bottom thanks to the two pivot links which allows him to navigate the environment all around him with the terminal.

[056] The terminal is free of any means of attachment with the user's head. The user simply brings his face against the facial interface to observe through the terminal via an observation area. [057] In Figure 2, an exemplary embodiment of the facial interface is illustrated. In this example, the facial interface 10 comprises:

at least one observation zone 22a, 22b (an observation zone for each eye for example) adapted to allow a user to observe through the facial interface,

an asymmetrical projection 23, 24 formed along at least a first contour portion of the observation zone 22a, 22b.

[058] When the user places his face at the observation area, the asymmetric projection co-operates with the user's face so that at least part of the projection (or its entirety) can be in contact with the face. The projection, being asymmetrical, cooperates effectively with the face whose general morphology is asymmetrical between the top and the bottom of the face relative to the eyes.

[059] The facial interface 10 may further include an interfacing surface 20 with the face of the user surrounding the viewing area. The interfacing surface may be of generally flat or curved shape. The overall flat shape, however, provides poorer performance in terms of external light occultation.

[060] When the user uses the terminal, he brings his face near or preferably against the interfacing surface 20 to observe through the observation zone 22a, 22b. When the general shape of the interfacing surface is curved, the interfacing surface 20 allows to marry the general shape of the user's face and to comfortably accommodate his forehead, for example. The contact of the curved surface with the forehead forms a cooperation that obscures the external light coming from above the user's head.

[061] The projection 23, 24 may comprise in particular:

a first portion 25a, 26a for facing a first face area of the user located above the eye when his eye is facing the observation zone 22a, 22b,

a second portion 25b, 26b intended to face a second face area of the user located below the eye when his eye is facing the observation zone 22a, 22b,

a third portion 25c, 26c for facing a third face area of the user located laterally outer to the eye when his eye is facing the observation area.

[062] The first portion 25a, 26a has a height less than the second portion 25b, 26b.

The third portion 25c, 26c of the projection has a higher height than the first portion 25a, 26a and the second portion 25b, 26b of the projection.

[063] Such a configuration of the projection makes it possible to further increase the occultation of light at the level of the facial interface. Indeed, when the user observes through the terminal, the facial interface marries the human face on well-targeted areas around the eyes, such as the arch, the cheekbone, the lateral edge of the eyes (ie the temple ). This additional concealment makes it possible to counter any external luminous flux that would have infiltrated at the level of the facial interface despite the curved shape of the interfacing surface and which otherwise would be likely to reach the observation zone and disturb the user in his observation. The sensation of immersion of the user is thus preserved, even if the conditions of external brightness are high.

[064] The height of the first portion 25a, 26a of the projection is preferably between 1 and 15 mm. In particular, the best results of occultation of the external light were obtained in the upper part of the observation zone when the first portion has an average height of 5 mm.

[065] The height of the second portion 25b, 26b of the projection is preferably between 5 and 20 mm. It appears that better occultation results of the external light have been obtained in the lower part of the observation zone when the second portion has an average height of 10 mm.

[066] The height of the third portion 25c, 26c of the projection is preferably between 10 and 30 mm. The best occultation results of the external light have been obtained partly laterally external to the observation zone when the third portion has a maximum height of 23 mm.

[067] These heights make it possible to obtain good occultation and comfort results while maintaining a distance between the eye and the observation zone which makes it possible to have a good quality of observation through the terminal, in particular if the terminal embeds an optical system (including at least one lens for example) through which the user observes the environment via the facial interface.

[068] A second portion 27 of contour of the observation zone 22a, 22b can be smooth and follow the generally curved shape of the interfacing surface. This smooth surface makes it possible to cooperate with a zone of the face that can correspond to the top of the nose and to the inter-brow zone.

[069] The terminal may further include a recess 28 arranged in the facial interface, the recess being intended to face the nose of the user when his eye is facing the observation area.

[070] The facial interface may be made from a material which preferably resists effectively and durably weathering, such as stainless steel, plastic or other.

[071] According to an advantageous embodiment, the projection is formed integrally with the facial interface, in the same material as the interface. The projection may for example be formed in one piece with the facial interface by conventional manufacturing techniques for obtaining a single piece (for example by molding or by machining). In this way, the protrusion can not be removed from the facial interface of the terminal. The projection is therefore less exposed to damage from acts of vandalism, and this avoids theft of this room.

[072] The projection may further be shaped so as to have at its proximal end a flat area 29a 29b for receiving more comfortably the face of the user. [073] In FIG. 3A and 3B are respectively illustrated a view from above and a view from below of the facial interface 10. The interface surface 20 may have a radius of curvature more particularly between 110 mm and 250 mm in order to to marry the general shape of the face. It has been found that this range of radii of curvature provides a larger contact area of the interfacing surface with the user's forehead than rays outside this range. The best light occultation results have been obtained in particular with a radius of curvature of 135, 145 or 155 mm. The asymmetric shape of the projection is further adapted to cooperate with many face morphologies and obscure light that would still infiltrated despite the curved shape of the interfacing surface. The recess 28 makes it possible to house the nose of the user so that he can properly cooperate his face with the interfacing surface and the projection, without his nose pressing on the interface surface, which could create discomfort and not allow to properly contact the top and especially the lower face with the facial interface.

[074] In Fig. 4, a user's face 80 is illustrated. This face cooperates with the facial interface 10 when this user uses the terminal. With the configuration of the interface, when the user places his face at the viewing area 22a, 22b: the curved interfacing surface 20 follows the general shape of the face face, and may come into contact with at least a portion of the user's face, particularly at the forehead;

the first portion 25a, 26a of the projection faces a first zone 82a, 82b of the face, situated above the eye, for example at the level of the arch;

the second portion 25b, 26b of the projection faces a second zone 84a, 84b of the face, located below the eye, typically the cheekbone;

the third portion 25c, 26c of the projection faces a third zone 86a, 86b of the face, located laterally external to the eye, this zone of the face may correspond to the temple; and

the second portion 27 of contour of the observation zone 22a, 22b faces a fourth zone 88 of the face, situated laterally inward with respect to the eye, such as the top of the nose or the inter-superciliary zone.

[075] The facial interface 10 thus maximizes the contact surfaces with the face, especially with the forehead and the eye contour of the user, to improve the occultation of external light while maintaining a good level of comfort since the interfacing surface and the contour of the observation zone are configured to cooperate with numerous face morphologies, in particular with the aforementioned value ranges given for the height of the portions of the projection and the radius of curvature of the surface of interfacing.

[076] In FIG. 5, the observation device 5 is illustrated. In this embodiment, the observation device 5 of the terminal may comprise a housing 60 which carries the facial interface 10. The housing 60 includes a screen 62. The screen is arranged in the observation device 5, at the within the housing 60, to be observed by the user through the observation zone 22a, 22b of the facial interface. In addition, the housing 60 is preferably opaque, in order to control the brightness conditions in the housing and at the screen. By "opaque" it is understood that any optical path between the screen and the outside of the housing passes through the observation zone 22a, 22b.

[077] This screen can display virtual reality contents, relative or not to the environment in which the terminal is installed. To this end, the terminal can embark storage means and data processing, images and / or videos for the implementation of augmented reality services and / or virtual reality on the terminal, via the display on his screen. These contents may be computer-generated images, videos and / or sounds to display on-screen an immersive computer simulation, visual and sound, real or imaginary environments.

[078] For example, the virtual content displayed by the screen of the terminal can be a virtual environment designed computerically from old plans of a real environment in which the terminal is installed. The environment displayed on the screen makes it possible to virtually reconstruct the real environment as it was in a bygone era and to add any type of complementary content (cultural information, historical characters, etc.).

[079] Thus, when the user uses the terminal, he can observe the environment with additional features. The facial interface makes it possible to mask the external light and thus to control the light conditions according to which the user observes the screen. Displaying content under these conditions provides an excellent feeling of immersion to the user in the environment observed through the terminal, and to use augmented reality and virtual reality features comfortably. The visualization quality of the augmented and virtual reality contents is superior to the quality of the visualizations offered by the terminals that do not have the facial interface 10. [080] Advantageously, the facial interface is fixed to the housing by means of anti-vandal fixing means (not shown in the figures). These vandal-resistant means can take the form of a vandal-proof screw system, for example, or by mounting pieces successively secured to one another by fasteners which are difficult to access, the use of fasteners requiring specific tools for disassembly, or the assembly of parts by welding or gluing.

[081] Referring to Figure 6, another embodiment of the observation device is illustrated. In this example, the housing 60 may comprise an optical device including at least:

a lens 70, and

a transparent protective layer 72.

[082] The optical device is arranged in the housing 60 between the screen 62 and the observation zone 22a, 22b of the facial interface 10, with the lens on the side of the screen and the transparent protective layer on the side. of the viewing area so that when the user observes the screen through the viewing area of the facial interface, he observes it via the optical device.

[083] The optical device makes it possible to improve the conditions for viewing the screen.

In addition to the occultation of external light, the projections 23, 24 furthermore make it possible to position the user's eye at a suitable distance with respect to the optical device, for example at the focal length of the lens, making it possible to position the lens correctly. user to enjoy a clear image when viewing the screen 62 of the terminal.

[084] The transparent protective layer 72 makes it possible to protect the lens and the screen placed in the housing, for example against undesirable acts of vandalism or projection (bird droppings, corrosive products, or the like). ). The transparency of this layer makes it possible not to modify the optical properties provided by the lens to view the screen through the observation zone.

[085] The transparent protective layer can also be sealed in the housing (by compression of an O-ring for example between the housing and the transparent protective layer) to prevent water can penetrate to inside this case. This embodiment can in particular be implemented when the terminal is installed outdoors and remains exposed to any type of weather.

[086] As a purely illustrative example, the transparent protective layer may be based on polymethyl methacrylate (PMMA) or polycarbonate (PC). Layer transparent could nevertheless be made of any other transparent material, in particular glass.

[087] The invention has been described with reference to particular embodiments that are not limiting. Of course, the present invention is not limited to the embodiment described by way of example and extends to other variants. For example, the facial interface may comprise only a single viewing area so that the facial interface can cooperate with a long-view optical device.

Claims

claims

Terminal (1) in particular for the 360 ° observation of virtual reality contents relating to an environment of a given time or other, comprising:

- a foot (3) adapted to be fixed to the ground, and

a facial interface (10) carried by the foot, the facial interface having at least one observation zone (22a, 22b) adapted to allow a user to observe through the facial interface,

characterized in that the facial interface has a projection (23,24) of asymmetrical shape, formed along at least a first contour portion of the observation zone, in particular continuous from an upper portion to a lower portion through a laterally outer part.

The terminal of claim 1 wherein the face interface includes an interface surface (20) with the face of the user surrounding the viewing area, the interfacing surface being generally curved in shape

Terminal according to claim 2, wherein the generally curved shape has a radius of curvature of between 110 mm and 250 mm.

A terminal according to any one of the preceding claims, wherein the projection comprises:

a first portion (25a, 26a) for facing a first face area (82a, 82b) of the user (80) above the eye when his eye is facing the viewing area ,

a second portion (25b, 26b) for facing a second face area (84a, 84b) of the user beneath the eye when his eye is facing the viewing area,

the first portion having a height less than the second portion.

Terminal according to claim 4, wherein the height of the first portion of the projection is between 1 and 10 mm.

6. Terminal according to any one of claims 4 and 5, wherein the height of the second portion of the projection is between 5 and 20 mm.

The terminal of any one of claims 4 to 6, wherein the projection further comprises a third portion (25c, 26c) for facing a third face area (86a, 86b) of the user (80 ) located laterally outside the eye when its eye is facing the observation zone,

the third portion of the projection having a height greater than the first portion and the second portion of the projection.

8. Terminal according to claim 7, wherein the height of the third portion of the projection is between 10 and 30 mm.

The terminal of any one of the preceding claims, wherein a second contour portion (27) of the viewing area is smooth and follows the generally curved shape of the interfacing surface.

10. A terminal according to any one of the preceding claims, wherein a recess (28) is arranged in the face interface, the recess being intended to face the user's nose when his eye is facing the area. observation.

11. Terminal according to one of claims 3 to 10, wherein the projection is formed integrally with the facial interface. 12. Terminal according to any one of the preceding claims, which is free from any attachment means with the head of the user.

Terminal according to any one of the preceding claims, comprising an observation device (5) carried by the foot, the observation device comprising a housing (60) carrying the face interface, the housing further including in its a screen (62), the screen being arranged in the observation device to be observed by the user through the observation area of the facial interface.

14. Terminal according to claim 13, the housing of the observation device is opaque. The terminal of any one of claims 13 to 14, wherein the face interface is attached to the housing via vandal resistant fastening means.

The terminal of any one of claims 13 to 15, wherein the housing further comprises an optical device including at least:

a lens (70) and

a transparent protective layer (72),

the optical device being arranged in the housing between the screen and the viewing area of the facial interface, with the lens on the side of the screen and the transparent protective layer on the side of the observation zone,

so that when the user observes the screen through the viewing area of the facial interface, he observes it via the optical device.