WRITING INSTRUMENT

Abstract

A writing instrument comprising a body having an axis, a writing tip, a reservoir and at least one visual mark being a specific mark for augmented reality applications, the at least one visual mark being configured to be hidden/visible when the writing tip is distant from a writing surface and to be respectively visible/hidden when the writing tip is in contact with a writing surface, at least a portion of the body being configured to allow the at least one visual mark to adopt two states, visible and hidden configuration.

Claims

1. A writing instrument comprising a body having an axis, a writing tip, a reservoir and at least one visual mark being a specific mark for augmented reality applications, the at least one visual mark being configured to be hidden/visible when the writing tip is distant from a writing surface and to be respectively visible/hidden when the writing tip is in contact with a writing surface, at least a portion of the body being configured to allow the at least one visual mark to adopt two states, visible and hidden configuration.

2. A writing instrument according to claim 1, wherein the writing tip is axially movable with regard to the body between a rest position and a contact position when the writing tip is pressed against a writing surface, the at least one visual mark being hidden/visible when the writing tip is in the rest position and visible/hidden, respectively, when the writing tip is in the contact position.

3. A writing instrument according to claim 1, wherein the at least one visual mark extends annularly around the axis.

4. A writing instrument according to claim 1, wherein the at least one visual mark extends in a surface forming an angle comprised between 45° and 90° with the axis, at a rear end of the writing instrument.

5. A writing instrument according to claim 1, wherein the body comprises at least one transparent window, the at least one visual mark being visible through the at least one window, when visible.

6. A writing instrument according to claim 5, wherein the at least one window is formed by a portion of the body.

7. A writing instrument according to claim 1, wherein a writing element comprises the writing tip, the at least one visual mark being formed on an annular portion fitted around the writing element.

8. A writing instrument according to claim 7, wherein the annular portion is fitted coaxially with the reservoir.

9. A writing instrument according to claim 1, wherein the reservoir comprises two radially opposed projections configured to bear against an end of a compression spring.

10. A writing instrument of claim 9, wherein an opposite end of the compression spring bears against an abutment located inside the body.

11. A writing instrument according to claim 1, wherein the at least one visual mark is not visible by naked eye.

12. A writing instrument according to claim 1, comprising at least one second visual mark being a specific mark for augmented reality applications, the at least one second visual mark being always visible.

13. A writing instrument according to claim 12, wherein the at least one visual mark comprises a first visual pattern and the at least one second visual mark comprises a second visual pattern which is different from the first visual pattern.

14. A writing instrument according to claim 12, wherein the at least one second visual mark is not visible by naked eye.

15. A set comprising a writing instrument according to claim 1, a holder for a smart device and a smart device.

16. A method for detecting whether a writing tip contacts a writing surface, comprising providing a set according to claim 15, placing the smart device onto the holder, orienting a camera of the smart device toward a 3D space comprising the writing surface and detecting whether the at least one visual mark is visible/hidden thereby determining whether the writing tip is in contact with a writing surface or not.

17. A method according to claim 16, further comprising, using the writing instrument on the writing surface, determining a position of the writing instrument in the 3D space using the second visual mark.

18. A method according to claim 17, further comprising processing images captured by the camera of the visual marks to determine what is being written by a user using the writing instrument on the writing surface.

19. A method according to claim 18, further comprising reproducing the processed images on a screen of the smart device.

20. A computer program including instructions for executing the steps of the method according to claim 16 when the program is executed by a computer or smart device.

21. (canceled)

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The disclosure can be better understood by reading the detailed description of various embodiments given as non-limiting examples. The description refers to the accompanying sheets of figures, in which:

[0042] FIG. 1 shows a set comprising a writing instrument, the writing tip being distant from a writing surface

[0043] FIG. 2 shows the writing instrument of FIG. 1 when the writing tip is in contact with a writing surface, and

[0044] FIG. 3 shows an exploded view the writing instrument of FIG. 1.

DETAILED DESCRIPTION

[0045] FIGS. 1 and 2 show a set 100 comprising a writing instrument 10 and a holder 50 for a smart device 200. The smart device 200 may be removably placed on the holder 50 with its camera 202 oriented toward a 3D space comprising a writing surface S.

[0046] The writing instrument 10, in this example a ball point pen, comprises a body 12 having an axis X and a writing tip 14. The writing instrument 10 comprises at least one visual mark 16, in this example three visual marks 16, configured to be hidden when the writing tip 14 is distant from a writing surface S (see FIG. 1) and to be visible when the writing tip 14 is in contact with a writing surface S (see FIG. 2). The marks 16 are configured to be detected by an augmented reality smart device, such as the smart device 200. The writing instrument 10 may comprise less or more than three visual marks 16. In alternative embodiments, the visual marks 16 may be hidden when the writing tip 14 is in contact with the writing surface S and visible when the writing tip 14 is distant from the writing surface S. Each visual mark 16 may extend annularly all around the axis X.

[0047] In the example of FIGS. 1 to 3, the body 12 comprises three transparent windows 12A, one for each visual mark 16, the visual marks 16 being visible through the windows 12A, when visible (i.e. when not hidden). The windows 12A may each extend annularly all around the axis X. The windows 12A may respectively be formed by a portion of the body 12. In examples, other number of windows may be foreseen, depending on the number of visual marks. In examples, the number of windows does not correspond to the number of visual marks, e.g. two visual marks may be visible through the same window or a single visual mark may be visible through more than one window.

[0048] The writing instrument 10 may comprises a second visual mark 18 which is always visible. The second visual mark is configured to be detected by an augmented reality smart device, such as the smart device 200. The second visual mark 18 may extend annularly all around the axis X. The visual marks 16 may each comprise the same first visual pattern 16A while the second visual mark 18 may comprise a second visual pattern 18A which is distinct and different from the first visual pattern 16A. The writing instrument 10 may comprise more than a single second visual mark. Some or all of the visual patterns of the visual marks 16 may be different from each other. The visual marks 16 may form a dynamic tracker and the second visual mark 18 may form a static tracker.

[0049] with the provision of the second visual mark 18 forming a static tracker on an outer surface of the body 12 of the writing instrument 10 allows for the writing instrument 10 to be accurately tracked and positioned relative to the camera of the smart device 200, e.g. using augmented reality techniques that support the capture real-time interaction of the specific visual mark 18 when the writing instrument 10 moves on the writing surface S and to create, register and/or translate the 2D or 3D representations in space of such movement of the writing instrument 10 on the writing surface S. Smart devices, e.g. a mobile phone or a tablet having a camera and enabled to create augmented reality representations are well-known in the field and will thus not be discussed in detail.

[0050] With reference to FIG. 3, the writing instrument 10 may comprise a writing element 20 received in part within the body 12. The body 12 may comprise a rear barrel 122 and a front part 124 mounted onto the rear barrel 122. The front part 124 may be screwed, snap fitted, welded, etc. with the rear barrel 122. The front part 124 may comprise a nose cone, a front barrel, etc. The windows 12A may be formed in the wall of the rear barrel 122.

[0051] The writing element 20 may comprises the writing tip 14 and a reservoir 22 onto which the writing tip 14 is mounted. The writing element 20 may comprise an annular portion 25 having the visual marks 16. The annular portion 25 may be fitted, for example press fitted, around and coaxially with the reservoir 22. The annular portion 25 may be blank between the adjacent visual marks 16.

[0052] The writing tip 14 may be configured to axially move with regard to the body 12 between a rest position (see FIG. 1) and a contact position (see FIG. 2) when the writing tip is pressed against a writing surface. For example, the reservoir 22 may comprises two radially opposed projections 22A configured to bear against an end 24A of a compression spring 24. The opposite end 24B of the compression spring 24 may bear against an abutment not shown located inside the body 12, in this example inside the rear barrel 122. The writing element 20, and thus in this example the writing tip 14, may axially move due to the compression of the spring 24 when a pressure is applied onto the writing tip 14, for example when writing. For example, the axial strike of the writing tip 14 may be axially limited due to the stiffness of the spring 24, or due to an abutment between the coils of the spring 24, or due to an abutment of the writing element 20 against a stop not shown located inside the body 12. The axial strike of the writing tip 14 may be configured so that the writing tip 14 remains always at least in part out of the body 12 and able to be in contact with a writing surface for writing.

[0053] The writing instrument 10 may be configured so that the visual marks 16 are hidden within the body 12 when the writing tip 14 is in the rest position and visible through the windows 12A when the writing tip 14 is in the contact position. For example, the axial strike of the writing tip 14 may be equal or less than the axial space between the adjacent windows 12A. The axial space (or distance) between the adjacent visual marks 16 may corresponds to the axial extension of the windows 12A. The axial space between the adjacent windows 12A may be equal or more than the axial extension of the marks 16. The axial extension of each window 12A may be equal or different, the axial extension of each visual mark 16 may be equal or different, the axial space or distance between each adjacent window 12A may be equal or different and the axial space or distance between each adjacent visual mark 16 may be equal or different.

[0054] The writing instrument 10 may be totally passive.

[0055] The smart device 200 may comprise a recording medium 200A readable by a computer and may have recorded thereon a computer program including instructions for executing the steps of the method described hereafter. In other words, the smart device 200 may include an application, as a computer program including instructions for executing the steps of the method described hereafter when the program is executed by a computer (in this example the smart device 200).

[0056] An embodiment of a method for detecting whether a writing tip contacts a writing surface, using the set 100, is described with reference to FIGS. 1 and 2.

[0057] The method may comprise a preliminary step of placing the smart device 200 onto the holder 50. The camera 202 of the smart device may be oriented toward a 3D space comprising a writing surface S and wherein the writing instrument 10 may be used.

[0058] The position of the writing instrument 10 in the 3D space may be determined using the second visual mark 18.

[0059] The method may comprise detecting whether the visual marks 16 are visible/hidden for determining whether the writing tip 14 is in contact with the writing surface S or not.

[0060] In the present example, when the visual marks 16 are hidden, it is determined that the writing tip 14 is not in contact with the writing surface S, as in FIG. 1. When the visual marks 16 are visible, it is determined that the writing tip 14 is in contact with the writing surface S, as in FIG. 2.

[0061] In examples, when the visual marks 16 (either hidden or visible) indicate that the writing instrument 10 is in a writing state, the method may further comprise determining a position of the writing instrument 10 in the 3D space using the second visual marks 18. This may be done by tracking or tracking and recording the second visual mark 18 in 2D or 3D space using the camera 202 of the smart device 200. The method may further comprise processing the tracked images to determine what is being written by the user. The method may further comprise reproducing the processed tracked images, i.e. what is being written by the user on the screen of the smart device 200. In examples, provided an adequate connection is established, the step of reproducing the processed tracked images on the screen may involve a screen of a separate device. When the user stops writing, the visual marks 16 indicate that the writing device is now in non-writing (hovering) mode and thus the smart device 200 stops the tracking/recording of the second visual mark 18 and no further output is depicted and/or recorded on the screen.

[0062] The visual marks 16 and/or the second visual mark 18 may be not visible by naked eye. The method may comprise a specific step of post-processing the image captured by the camera 202 of such visual marks 16/18.

[0063] Such a method may be part of method for tracking and positioning a writing instrument in a 2D or 3D space. Such a method may be part of an augmented reality application and/or of a writing digitalization.

[0064] Although the present disclosure is described with reference to specific examples, it is clear that modifications and changes may be made to these examples without going beyond the general scope of the disclosure. In particular, individual characteristics of the various embodiments shown and/or mentioned may be combined in additional embodiments. Consequently, the description and the drawings should be considered in a sense that is illustrative rather than restrictive.

[0065] Additionally, all of the disclosed features of an apparatus may be transposed, alone or in combination, to a method and vice versa.