EP1341677B1 - Drawing aid device - Google Patents

Abstract

A device enabling a user to reproduce an observed scene on a drawing board support including a first mirror; at least one second mirror, the mirrors being arranged to transmit an image from the support onto an eyepiece in front of which the user can position a first eye; and a secondary support capable of being intercalated between the scene and a second eye to be able to handle a close scene.

Description

The present invention relates to the field of drawing assistance devices.

The present invention relates more particularly to a device allowing a user to reproduce a scene observed on a support, of the drawing board type, said device comprising a first mirror and at least a second mirror, said mirrors being arranged so as to send back the image of the support on an eyecup in front of which the user can have a first eye.

The prior art already knows devices for drawing assistance and in particular the French patent application number FR 2 757 667 which relates to a portable device for the execution of a drawing, of the type comprising an objective and a mirror which reflects the image captured by the lens to a screen positioned flat.

This device, if it actually allows to reproduce a scene, does not present a great interest in the learning of the art of drawing, because it does not give the leisure to interpret the scene; the technique used is similar to the copying of a work with a tracing paper placed on it.

The prior art also knows the French patent application number FR 2 164 555 which relates to a device comprising two mirrors allowing a user to reproduce an observed scene, on a support, of the drawing board type.

This device has the major disadvantage of not allowing to reproduce a plane image from a book or any reproduction.

Moreover, the invention presented in this document is positioned essentially in relation to luminosity problems of the object to reproduce. This kind of problem only arises with natural scenes and does not arise with images.

The present invention intends to overcome the disadvantages of the prior art by proposing a device for assisting the production of drawings or paintings based on the ability of human vision to accept the superposition of images that seem to be in the same plane thanks to mirrors. This device thus allows the draftsman or painter to learn to evaluate the perspectives and to reproduce in a simple and effective way either scenes in perspective, or flat representations.

To do this, the present invention is, in its broadest sense, of the type claimed in claim 1.

The reproduction device according to the invention comprises a secondary support for the reproduction of flat images, capable of being interposed between the scene and said second eye, in order to spare a close scene.

In a variant, said secondary support consists of a transparent element and one or more movable support rod (s), pressed (s) against the rear face of the transparent element with one or more spring (s), to allow the reproduction of models presented, for example in thick books.

In another variant, the device according to the invention comprises adjustment means for the translation of said secondary support on said device.

In a variant of the invention, the device consists of a central recessed portion, the support and the secondary support being articulated at the base of this central part, to allow to close it and thus form a briefcase.

Said central portion preferably comprises a means for adjusting the height of the eyepiece.

The device further comprises, preferably, a handle to facilitate its grip.

In one version of the invention, the handle and said first mirror form a single piece that is rotatable along the central portion.

The first mirror and the second mirror are perpendicular to the same longitudinal plane and are offset by an angle of 20 degrees.

The second mirror, the one closest to the eye, can be a semi-transparent mirror, to allow the first eye to visualize the scene.

The device may comprise at least one second eyepiece, provided with a filter which can be positioned in front of a second eye, in order to reduce the brightness of the scene perceived by the second eye.

The device may also include at least one second eyecup, associated with at least two mirrors, for returning an image of the scene to a second eye.

This second eyepiece may be movable relative to said first eyepiece, to allow the user the leisure to choose which eye, left or right, it positions in front of the first eyepiece and which eye it positions in front of the second eyepiece.

The first mirror and / or the second mirror preferably has a trapezoid shape in order to free the maximum space for the movement of the hands and arms.

The first eyepiece and / or second eyepiece may or may further include means for enlarging or reducing the perceived image.

The support is inclined at an angle of 60 ° with respect to said first mirror and at an angle of 47 ° with respect to a reference plane of said device.

Said first mirror and / or said second mirror may or may have means for adjusting their flatness, in order to make it possible to change the scale of the perceived image.

The device preferably comprises means for varying the distance or distances between said first mirror and / or said second mirror and / or said support along a same longitudinal plane.

Advantageously, the device according to the invention makes it possible to produce drawings or paintings by virtue of the fact that the images of the scene to be reproduced and the medium of the reproduction are superimposed in front of the eyes.

This device thus provides a tool for learning drawing or painting for children or adults.

Advantageously, the device according to the invention is portable and can be adapted to the brightness of the observed scene and makes it possible to vary the size of the observed scene and / or the support.

• la figure 1 illustre une vue de côté du schéma de principe du dispositif de base selon l'invention;
• la figure 2 illustre une vue de dessus du schéma de principe du dispositif de base selon l'invention ;
• la figure 3 illustre une vue de dessus du schéma de principe du dispositif selon l'invention muni d'un filtre ;
• la figure 4 illustre une vue de côté d'une variante du dispositif selon l'invention ;
• la figure 5 illustre une vue en perspective d'une variante du dispositif selon l'invention ;
• la figure 6 illustre une vue en perspective d'une autre variante du dispositif selon l'invention;
• la figure 7 illustre une vue en perspective avant d'une variante du dispositif selon l'invention pouvant se refermer afin de former une mallette ;
• la figure 8 illustre une vue en perspective arrière de la variante de la figure 7 ;
• la figure 9 illustre une vue en perspective de la variante des figures 7 et 8 en position fermée ;
• la figure 10 illustre un demi-pied avant pour la variante des figures 7 et 8 ;
• la figure 11 illustre un demi-pied arrière pour la variante des figures 7 et 8 ;
• la figure 12 illustre une crémaillère pour la variante des figures 7 et 8 ;
• la figure 13 illustre une pièce d'entraînement pour la variante des figures 7 et 8 ; et
• les figures 14 à 18 illustrent le mouvement de la pièce d'entraînement par rapport à la crémaillère lors de la rotation du moyen de réglage.

The invention will be better understood from the following description, given purely for explanatory purposes, of one embodiment of the invention, with reference to the appended figures:

• Figure 1 illustrates a side view of the basic diagram of the basic device according to the invention;
• FIG. 2 illustrates a view from above of the basic diagram of the basic device according to the invention;
• Figure 3 illustrates a top view of the block diagram of the device according to the invention provided with a filter;
• FIG. 4 illustrates a side view of a variant of the device according to the invention;
• FIG. 5 illustrates a perspective view of a variant of the device according to the invention;
• FIG. 6 illustrates a perspective view of another variant of the device according to the invention;
• Figure 7 illustrates a front perspective view of a variant of the device according to the invention can be closed to form a briefcase;
• Figure 8 illustrates a rear perspective view of the variant of Figure 7;
• Figure 9 illustrates a perspective view of the variant of Figures 7 and 8 in the closed position;
• Figure 10 illustrates a front half-foot for the variant of Figures 7 and 8;
• Figure 11 illustrates a rear half-foot for the variant of Figures 7 and 8;
• Figure 12 illustrates a rack for the variant of Figures 7 and 8;
• Figure 13 illustrates a drive part for the variant of Figures 7 and 8; and
• Figures 14 to 18 illustrate the movement of the driving part relative to the rack during the rotation of the adjusting means.

The embodiments shown in Figures 1, 2, 3, and 6 are not covered by the claims but are part of the state of the art and are useful for understanding the invention.

The device (1) according to the invention, illustrated schematically in FIG. 1, is a device enabling a user (2) to reproduce a scene (3) observed, on a support (4), of the drawing board type, thanks to the principle of the differentiation of the images perceived by each of the eyes, of the type comprising a mirror (5).

The device (1) according to the invention is characterized in that it comprises at least one second mirror (6), said mirrors (5, 6) being arranged so as to return the image of the support (4) on a eyecup (7) in front of which the user (2) can arrange a first eye (8).

The first eye (8) of the user (2) thus perceives the support (4), whose image is returned to the place by the first mirror (5) and the second mirror (6) and the second eye ( 8 ') of the user (2) perceives the scene (3) live.

When the first eye (8) is placed in front of the eyepiece (7) and the second eye (8 ') observes the scene (3), the human binocular vision makes the images of the support (4) and the scene ( 3) are superimposed, thus allowing the reproduction of the scene (3) on the support (4).

Said first mirror (5) and said second mirror (6) are preferably perpendicular to the same longitudinal plane P and are offset by an angle A1 of 20 degrees, as shown in FIG.

In a variant of the invention, said second mirror (6), which is the closest to the eye (8), is preferably a semi-transparent mirror or a mirror, so that the eye (8) that looks by the eyepiece (7) can also see the scene (3).

In this variant, it is not necessary for the second eye (8 ') to observe the scene (3) since the first eye (8) perceives both the scene (3) and the support (4).

In this variant, the focus of the eyes (8, 8 ') is simplified and the comfort of observation increased.

In a variant of the invention, said device (1) comprises at least a second eyepiece (7 '), provided with a filter (9) which can be positioned in front of said second eye (8'), in order to reduce the brightness of the scene (3). This device is particularly useful when reproducing scenes lit by daylight.

It is possible to offer a range of filters with different degrees of filtration.

In the variant of FIG. 5, the device (1) is provided with two eyecups (7 '), arranged on either side of the eyepiece (7), in order to allow the user to relax. choose with which eye, right or left, he looks through the first eyepiece (7).

In a variant of the invention, said device (1) comprises at least a second eyepiece (7 ') associated with at least two mirrors (5, 6), for returning an image of the scene (3) to a second eye (8 ').

In a variant, said second eyepiece (7 ') is unique and is movable relative to said first eyepiece (7), ie it can be positioned to the right or to the left of the eyepiece (7), by example by rotation around the outline of the eyecup (7).

Said first mirror (5) and said second mirror (6) preferably have a trapezoid shape, so as not to interfere with the field of vision of the eye (8 ') and to free space for the passage of the hands and the user's arms.

The second mirror (6) is smaller than the first mirror (5), in order to limit the size of the device (1). The second mirror (6) exactly returns the image of the first mirror (5) to the eyecup (7).

The largest base of the two mirrors (5, 6) is positioned downward.

Said first eyepiece (7) and / or said second eyepiece (7 ') may furthermore comprise means for enlarging or reducing the perceived image or images perceived by the eye or the eyes.

Thus, the reproduction performed may not be totally faithful to the scene observed, if the user wishes.

These means for enlarging or reducing the perceived image may consist of lenses positioned at one or more eyecups (7, 7 '). These lenses are preferably removable and form a range of magnification and reduction.

Said first mirror (5) and / or said second mirror (6) may or may have means for adjusting their flatness which also constitute means for varying the size of the image or images perceived by the eye or eyes. These means may consist, for example, of one or more screws each associated with a thread and whose movements relative to the threads cause the deformation of the reflective or semi-reflecting surface of the first mirror (5) and / or the second mirror (6).

The device (1) may also comprise means making it possible to vary the distance or distances between said first mirror (5) and / or said second mirror (6) and / or said support (4) along the same longitudinal plane P which constitute also ways to vary the size of the image or images perceived by the eye or the eyes.

All these means described for modifying the proportions of the images perceived and therefore the proportions of the work performed on the medium (4) can also be implemented to distort the images and thus generate special graphic effects.

The support (4) is inclined at an angle A2 of 60 ° with respect to said first mirror (5) and at an angle A3 of 47 ° with respect to a reference plane R of said device (1). Thus, the first mirror (5) is inclined relative to the vertical of an angle of 17 ° A4.

The angles A1, A2, A3, A4 are given with a precision of the order of 3 degrees.

In the version illustrated in FIGS. 4 and 5, a first arm (11) makes it possible to maintain the first mirror (5) with respect to said support (4) and a second arm (12) makes it possible to maintain the second mirror (6) with respect to said first mirror (5).

It is important to note that the reference plane R is illustrated horizontally, but that it may not be so insofar as the device (1) is portable.

In the version shown in FIG. 6, the first arm (11) makes it possible both to maintain the first mirror (5) with respect to said support (4) and all the eyelets (7, 7 ').

The device (1) may further include a standard positioning nut for attachment to a tripod.

The device (1) further comprises a secondary support (10) for the reproduction of plane images, capable of being interposed between the scene (3) and said second eye (8 '), so as to arrange a close scene (3').

The secondary support (10) is held in the rest of the device (1) by a third arm (13) and optionally a retractable reinforcement (14).

In a preferred version, the secondary support (10) consists of a transparent element (15) and one or more movable support rod (s) (16), pressed against the rear face. of the transparent element (15) by means of one or more spring (s) (17).

This version makes it possible to position a book or a magazine against the transparent element (15) and thus to have a scene (3 ') flat, which would not be the case, especially in the case of big books, if the model was only placed on the front side of the secondary support (10).

The device (1) further preferably comprises adjustment means for translating said secondary support (10) on said device (1). These adjustment means may constitute, for example in one or more worms, free in rotation, each cooperating with a nut positioned at the base of the secondary support (10).

The device (1) may further have a plurality of facets to position it at different angles to the horizontal. This facilitates the reproduction of a scene or an object located near the device (1). The facets may be arranged, for example, on the underside of the support (4) or the third arm (13).

The device (1) according to the invention is preferably made using foldable elements and / or removable.

In a variant of the invention illustrated in FIGS. 7 to 9, the device (1) has a storage state in the form of a case (20).

The device (1) consists of a recessed central portion (21), forming an arch, the support (4) and the secondary support (10) being articulated at the base of this central portion (21), in order to allow close it to form the briefcase. The support (4) and the secondary support (10) thus form the side walls of the case and the central portion (21) forms the periphery.

The central portion (21) consists of a front half-foot (26), illustrated in FIG. 10, of a rear half-foot (27), illustrated in FIG. 11, assembled with the aid of a transverse piece, not illustrated. in detail.

The central portion (21) comprises a means (22) for adjusting the height of the eyecup (7) without changing the orientation of the mirrors (5, 6) with respect to each other and with respect to the support (4). This adjustment means (22) consists of a knob that can be rotated. The button is intended to cooperate with a rack (28), illustrated in FIG. 12, and cause the rotation of a driving piece (29), illustrated in FIG. 13, as can be seen in FIGS. 14 to 18.

FIG. 14 illustrates a rest position, FIGS. 15 to 17, rotation of the driving piece (29) and raising of the rack (28) and FIG. 18, a new rest position in which a half foot (25, 26) has been shifted by a pitch P of about 10 millimeters from the other half foot (26, 25).

The rack (28) and the driving part (29) are housed inside the half-feet rack (28) cooperates with at least one lug formed inside one of the half-feet.

The device (1) further comprises a handle (24) to facilitate its grip.

In one version of the invention, the handle (24) and said first mirror (5) form a single piece that is rotatable about the central portion (21).

Thus, when the handle is retracted against the central portion (21), the mirror (5) is exactly positioned for the reflection of the scenes, and when the mirror (5) is stored under the transverse part of the ache, the handle ( 24) is raised.

Claims (18)

1. A device (1) allowing a user (2) to reproduce an observed scene(3), on a surface (4), such as a drawing board, comprising a first mirror (5) and at least a second mirror (6), the said mirrors (5,6) being placed so as to reflect the image from the surface (4) on an eyepiece diaphragm (7) from which the user (2) can dispose a first eye (8), characterised in that is comprises a secondary surface (10), liable to come between the scene (3) and a second eye (8'), in order to provide for a close scene (3').
2. A device (1) according to claim 1, characterised in that the said secondary surface (10) consists of a transparent element (15) and one or several mobile maintenance rods (16), set against the rear side of the transparent element (15) due to one or several springs (17).
3. A device (1) according to claim 1 or claim 2, characterised in that it comprises means of adjustment enabling the transposition of said secondary surface (10) on said A device (1).
4. A device (1) according to any of claims 1 to 3, characterised in that it comprises a hollow central part (21) forming an arch, the surface (4) and the secondary surface (10) being articulated at the base of this arch (21), in order to allow it to close the said A device, said surface and said secondary surface forming the lateral walls of a case and the central part forming the circumference of this case.
5. A device (1) according to claim 4, characterised in that said central part (21) comprises a means of adjustment (22) for the height of the eyepiece diaphragm (7).
6. A device (1) according to claim 4 or claim 5, characterised in that it comprises a handle (24).
7. A device (1) according to claim 6, characterised in that said handle (24) and said first mirror (5) form a single unit that is mobile in rotation according to the central part (21).
8. A device (1) according to any of claims 1 to 7, characterised in that said first mirror (5) and said second mirror (6) are perpendicular to the same longitudinal plane P and are set off by an angle A1 of 20 degrees.
9. A device (1) according to any of claims 1 to 8, characterised in that said second mirror (6) is a semitransparent mirror.
10. A device (1) according to any of claims 1 to 9, characterised in that it comprises at least one second eyepiece diaphragm (7'), equipped with a filter (9) that can be positioned in front of a second eye (8').
11. A device (1) according to any of claims 1 to 10, characterised in that it comprises at least one second eyepiece diaphragm (7') associated with at least two mirrors (5, 6) allowing for the reflection of an image from the scene (3) to a second eye (8').
12. A device (1) according to claim 10 or claim 11, characterised in that said second eyepiece diaphragm (7') is mobile with respect to said first eyepiece diaphragm (7).
13. A device (1) according to any of claims 1 to 12, characterised in that said first mirror (5) and/or said second mirror (6) have a trapezoid shape.
14. A device (1) according to any of claims 1 to 13, characterised in that said first eyepiece diaphragm (7) and/or second eyepiece diaphragm (7') comprise means to enlarge or reduce the image perceived.
15. A device (1) according to any of claims 1 to 14, characterised in that the surface (4) is inclined at an angle A2 of 60° with respect to that of said first mirror (5).
16. A device (1) according to any of claims 1 to 15, characterised in that the surface (4) is inclined at an angle A3 of 47° with respect to a reference plane R of said A device (1).
17. A device (1) according to any of claims 1 to 16, characterised in that said first mirror (5) and/or said second mirror (6) have means of adjustment of their inherent flatness.
18. A device (1) according to any of claims 1 to 17, characterised in that it comprises means to modify the distances between said first mirror (5) and/or said second mirror (6) and/or said surface (4) according to a same longitudinal plane P.

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