FR2844904A1 - Magnetic screen for written notices has two opposite surfaces with magnetic pen that erases one while writing on the other - Google Patents

Abstract

The magnetic screen (1) has two opposite and parallel surfaces (2,2') with ferromagnetic material between them, e.g. iron filings in a suspension. The two surfaces are separated by a reinforcing element and are positioned back-to-back, so that a magnetic pen used to write on one side erases any previous inscription on the other one. The screen can be mounted on a support (4) that allows it to be set at an angle of 45degrees to the vertical e.g. by a ball joint.

Description

MAGNETIC DEVICE FOR REALIZING A GRAPHIC DISPLAY

  The present invention relates to a magnetic device for producing a graphic display. It 5 applies in particular, but not exclusively, to a device comprising two magnetic slates arranged parallel opposite one another so that a user can, by writing on one of the two slates,

  erase the writings on the other slate.

  The prior art knows slates

  magnetic comprising a writing area, encased in a frame with a background, generally of a light color, an eraser passing under the writing area so as to erase the writings made on said writing area.

  These slates conventionally include a stylus, or pencil, with one or two magnetic points, necessary for writing. Thus, the stylus, or pencil, with the magnetic tip attracts the iron filings, of black color, in contact with the upper face of the writing area forming

thus a trait.

  One embodiment of this type of slate generally consists of iron filings contained in a "milk" trapped between two plastic films

  transparent, for example glued or welded together.

  This structure is stabilized by a honeycomb-shaped network to prevent crushing and

filings migration.

  In this structure, the erasure is carried out using a strip attracting the filings under the surface of the writing area so that it disappears from

said surface.

  Such a device is described in the patent

American US 414 372.

  Another type of structure consists of 10 encapsulated iron filings; the capsules being stabilized in a sticky or dry coating. In the same way as previously, these capsules are trapped between two plastic films glued or welded, generally having a thickness of about 0.5 millimeter. The magnetized pencil or stylus 15 likewise attracts iron filings, the erasure of the writings also being carried out

the same as before.

  One such device is disclosed in US Patent No. 5,057,363.

  These devices of the prior art are certainly

  powerful, but they do not allow several users to write at the same time and to produce particularly interesting and amusing sets of figures.

  Thus, the invention therefore more particularly aims to eliminate this gap. To this end, it proposes a magnetic device for producing a graphic display, comprising a writing means comprising at least one magnet for writing on a display screen, a display means comprising at least two parallel faces, the one of the faces comprising a display screen, as well as a housing comprising a ferromagnetic element disposed between the two above-mentioned parallel faces, characterized in that the second parallel face also comprises a display screen, the two display screens being arranged substantially at one in front of the other. Thanks to these features, the invention allows at least two users to use or have fun with the magnetic device. Thus, when one of the 10 users is writing on one of the faces of the display device, the other can erase part or all of the writings of his comrade by writing, substantially opposite the writings , on the other side of the

display device.

  Thus, it is now possible to selectively correct a detail of your drawing, without having to delete the entire drawing, or to be able to delete your drawing while keeping a particular area. it will also be possible, thanks to this device, to make drawings which are difficult, if not impossible, to produce with current devices, such as for example drawing a black block and drawing, on the other screen, a cross inside to obtain a

window or flag.

  Preferably, the device according to the invention will comprise an erasing means comprising a magnetic part capable of erasing the writing produced on one of the display screens when said means passes over the other display screen. In this case, the passage of

  the above erasing means will be produced substantially opposite the writing carried out on the other display screen.

  In this case, the erasing means may be in elongated form, for example identical to a pencil or

of a tampon.

  Advantageously, the writing means will be the erasing means. According to a possibility offered by the invention,

  the device according to the invention will include a support.

  According to an advantageous characteristic, the support 10 will comprise at least one housing, for example capable of

  accommodate the writing and / or erasing means.

  In this case, the display means may be detachably fixed on the support, for example provided by means of a ball joint, or be permanently fixed on the support, for example over the entire length of its lower edge. In the case where the display device is removable on the support, the display means may comprise a base fixed to the support; the display means then being tiltable by 450 relative to

the vertical position of said means.

  Advantageously, the device of the invention will comprise a writing / erasing means comprising a plurality of magnets intended either for writing or for erasing, depending on the display screen on which this means is used. In this case, one of the magnets will be in an elongated form, for example identical to a squeegee, and that another magnet is located at one of the ends of the writing / erasing means, through

  example in the form of a tapered tip.

  Furthermore, the writing means may consist of a stylus with a magnetic tip mounted on a spring. In the devices of the prior art,

  the user has a product with an eraser integrated on the face of the display screen, the user must frequently handle two tools * the stylus and the eraser, which must preferably be attached to the product by a link.

  Similarly, the writing means may comprise at its end close to the magnetic tip, protruding from the tip, a compressible reinforcement 15, in particular so as to produce a stylized writing or to protect the display screen against piercing. In this case, the reinforcement may be an expanded polymer foam of low density, for example polyurethane, and with a thickness of between 1 and 10 20 millimeters. Furthermore, the periphery of the reinforcement may

  be surrounded by a flexible fabric, preferably stretchy.

  Advantageously, the writing means will consist of a stylus with a magnetic tip comprising a protruding guard 25 mounted on a spring, in particular so as to produce a stylized writing or to protect the screen from

visualization against piercing.

  According to another possibility offered by the invention, the display means can be fixed

removable on the support.

  Embodiments of the invention will be described below, by way of non-limiting example, with reference to the accompanying drawings in which: - Figure 1 illustrates a perspective view of a device according to the invention; FIG. 2 illustrates an embodiment of a stylus for writing on a display screen of the display device according to the invention; - Figure 3 illustrates a sectional view of another embodiment of a stylus for writing on a display screen of the display device according to the invention; FIGS. 4a to 4e illustrate two vertical sections of an embodiment of the display device and its support; - Figure 5 illustrates an exploded view of the

device according to the invention.

  Thanks to the device according to the invention, a drawing or writing surface is accessible from both

  sides of display 1.

  Furthermore, it is not useful to recall here the method of manufacturing such a display device 1 because it is necessary to produce, according to a technique of the prior art as described above, a display device 1 comprising two parallel faces, each of them comprising a display screen 2 for

writing and erasing.

  Thus, the display screens 2 and 2 ′ are arranged back-to-back at a short distance. The space between these two display screens 2 and 2 'includes a housing, not visible in the various figures, for trapping a ferromagnetic component of dark color, such as by

example of iron filings.

  A user will thus be able to write on one of the two display screens 2 and 2 ′, as shown in the appended figures, using a stylus comprising a magnetic tip capable of attracting the ferromagnetic component so as to draw a line of color

dark on the screen 2 or 2 '.

  As shown in FIG. 2, the stylus serving as writing means will consist of an elongated body comprising a long magnet 7 capable of erasing a large writing surface. Furthermore, this long magnet 7 can also be used to make traces

wider.

  The drawing surface, i.e. the display screens 2 and 2 ', can be placed and maintained

firmly on a support 4.

  The device according to the invention, illustrated in FIG. 1, is used with a display device 1 fixed at two points to the support 4, located at the bottom right and at

  left of the 2 or 2 'viewing screen.

  It could also be envisaged to carry out the fixing of the display device 1 to the support 4 on

  its entire edge or lower end.

  A ball joint, not shown in the appended figures, can also be provided in the case of a shaping of the support 4. This ball joint has the advantage of passing from the front side, designated as such because the single user chooses practice erasing, on the back side, designated as such because the user

  unique chooses to practice writing.

  According to the embodiment of the invention shown in Figures 4a to 4e, the display device 1 has a lower base. In this embodiment, the base is fixed and has a slight inclined angle relative to the plane in which the two display screens 2 and 2 'extend. Consequently, the support 4 also has a housing of shape and size adapted for said base in order to appropriately fix the display device 1 to the support 4. According to a possibility offered by the invention, the device display 1 will eventually be suitable for

  orient themselves independently of the base.

  According to FIGS. 4c to 4e, this housing present in the support 4 will extend at an angle relative to the vertical. Thus, the user can reverse the position of the screens 2 and 2 'so that the display device 1 has an inclined angle, as shown in Figure 4e. Furthermore, the base makes it possible to retain the display device when said device 1 as well as the support are handled and / or transported. In the same way as previously, the display device 1 is movable in rotation relative to the base so that the display screens 2 and 2 ′ can be positioned at the angle desired by the user. The display device 1 may also include a plurality of notches capable of ensuring the fixing or the fixed maintenance of an inclination of the viewing screens 2 and 2 'according to the wish of the user (s), such as for example notches for a

tilt of 50, 100, 250 and 400.

  As illustrated in FIGS. 2 and 3, the writing means 15 may consist of a stylus provided with a magnetic tip. The tip of this stylus can be spring mounted in order to have a better touch of the screen 2 or 2 'and also to minimize the risk of perforation of the viewing screens 2 and 2'. This stylus will have one end with a relatively strong magnet, that is to say more powerful than the usual styli, said end being held at a distance from the display screen 2 or 2 ′ by a compressible material or generally speaking

what a compressible volume.

  Thus, this stylus comprises a compressible reinforcement 5 made of low density polyurethane foam 30 and about 5 millimeters thick. This layer of foam is surrounded by a flexible and preferably stretchy fabric 6, for example a lycra, making it possible to guarantee good sliding and less wear of the stylus and of the writing area. Thanks to this writing means according to the invention, the gesture induced by this stylus is flexible and close to an artist's gesture with a brush or a charcoal. In addition, 5 instead of drawing a black line, it allows to obtain a velvety effect a little wide and whose intensity varies with

  the pressure exerted by the user.

  According to an advantage proposed by the invention, the display device 1 will present on its lower edge, a curved part 8 inwards, so that when a user transports the device according to the invention, this curved part 8 can be placed against the body of the user in order to wedge said device during transport. Likewise, this curved part 8 will be very useful when the user is for example seated and wishes to wedge the display device.

1 against his belly or his body.

  The invention is described in the foregoing by way of example. It is understood that a person skilled in the art is able to carry out different variants of the invention without

  however, outside the scope of the patent.

Claims (21)

REVENDI CATIONS   1. Magnetic device for producing a graphic display, comprising a writing means 5 comprising at least one magnet for writing on a viewing screen 2 or 2 ′, a display means comprising at least two parallel faces, the one of the faces comprising a display screen 2 or 2 ′, as well as a housing comprising a ferromagnetic element disposed between the two above-mentioned parallel faces, characterized in that the second parallel face also comprises a display screen (2 or 2 ′ ); the two display screens (2 and 2 ') being arranged substantially back-to-back at a short distance. 2. Magnetic device for producing a graphic display according to claim 1, characterized in that it comprises an erasing means comprising a magnetic part capable of erasing the writing produced on one of the display screens (2 or 2 ') during the passage of said   medium on the other display screen (2 or 2 ').   3. Magnetic device for producing a graphic display according to claim 2, characterized in that the passage of the above erasing means is carried out substantially opposite the writing carried out on   the other display screen (2 or 2 ').   4. Magnetic device for producing a graphic display according to the preceding claims,   characterized in that the writing means is the erasing means. 5. Magnetic device for producing a graphic display according to claim 1, characterized   in that it comprises a support (4).   6. Magnetic device for making a   graphic display according to claims 1 and 5, characterized in that the display means is fixed   removably on the support (4).   7. Magnetic device for making a   graphic display according to claims 1 and 5, characterized in that the display means is fixed   permanently on the support (4).   8. Magnetic device for making a   graphic display according to claim 5, characterized in that the support (4) comprises at least one housing, for example capable of accommodating the writing and / or erasing means.   9. Magnetic device for making a   graphic display according to claim 2, characterized in that the erasing means is in the form of an elongate, that is to say consisting of a long magnet (7).   10. Magnetic device for making a   graphic display according to claims 1 and 2, characterized in that it comprises means   writing / erasing comprising a plurality of magnets intended either for writing or for erasing, depending on the display screen (2 or 2 ′) on which this means is used. 11. Magnetic device for producing a graphic display according to claim 10, characterized in that one of the magnets is in an elongated shape, for example identical to a squeegee, and that another magnet is located one end of the writing / erasing means 35, for example in the form of a tapered tip.   12. Magnetic device for producing a graphic display according to claim 7, characterized in that the display means is fixed over the entire length of its lower edge. 13. Magnetic device for making a   graphic display according to claim 6, characterized in that the fixing of the display means on the support 10 (4) is ensured by means of a ball joint.   14. Magnetic device for producing a graphic display according to claim 6, characterized in that the display means comprises a base fixed to the support (4); the display means then being tiltable by 450 relative to the vertical position said means.   15. Magnetic device for producing a graphic display according to claim 1, characterized in that the writing means consists of a stylus with a magnetic tip, protruding from the point, spring mounted.   16. Magnetic device for producing a graphic display according to claim 1, characterized in that the writing means comprises at its end close to the magnetic tip a compressible reinforcement (5), in particular so as to produce a stylized writing or for protect the display screen (2 or 2 ') against piercing. 17. Magnetic device for producing a graphic display according to claim 1, characterized in that the writing means consists of a stylus with a magnetic tip comprising a protruding guard mounted on a spring, in particular so as to produce a stylized writing or for protect the display screen (2 or 2 ') against piercing.   18. Magnetic device for producing a graphic display according to claim 16, characterized in that the reinforcement is a foam of expanded polymer of low density, for example polyurethane, and a   thickness between 1 and 10 millimeters.   19. Magnetic device for producing a graphic display according to claim 18, characterized in that the periphery of the reinforcement is surrounded by a fabric   flexible (6), preferably extensible.   20. Magnetic device for making a   graphic display according to claims 1 and 5, characterized in that the display means is fixed removable on the support (4).   21. Magnetic device for producing a graphic display according to claim 1, characterized in that said device has a curved part (8)   allowing in particular to facilitate its transport.