EP3320418A1 - Interface tactile à support de coque, coque tactile et capteurs de contrainte mécanique - Google Patents
Interface tactile à support de coque, coque tactile et capteurs de contrainte mécaniqueInfo
- Publication number
- EP3320418A1 EP3320418A1 EP16747828.8A EP16747828A EP3320418A1 EP 3320418 A1 EP3320418 A1 EP 3320418A1 EP 16747828 A EP16747828 A EP 16747828A EP 3320418 A1 EP3320418 A1 EP 3320418A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- touch
- shell
- sensors
- support
- stress
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G06—COMPUTING OR CALCULATING; COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F3/00—Input arrangements for transferring data to be processed into a form capable of being handled by the computer; Output arrangements for transferring data from processing unit to output unit, e.g. interface arrangements
- G06F3/01—Input arrangements or combined input and output arrangements for interaction between user and computer
- G06F3/03—Arrangements for converting the position or the displacement of a member into a coded form
- G06F3/041—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
- G06F3/0414—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position
- G06F3/04142—Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means using force sensing means to determine a position the force sensing means being located peripherally, e.g. disposed at the corners or at the side of a touch sensing plate
Definitions
- the present invention relates to a touch interface with a shell support, a tactile shell and mechanical stress sensors.
- a targeted application is the use of mechanical stress sensors, in particular capacitive sensors, to make any surface, whatever its material (with the proviso that it has elastic properties) and whatever its shape, tactile. (flat or raised), its size and layout (horizontal, inclined or vertical).
- the frame is composed of emitting and receiving infrared light emitting diodes arranged respectively vis-à-vis horizontally and vertically so as to generate a grid of the surface.
- the frame is composed of emitting and receiving infrared light emitting diodes arranged respectively vis-à-vis horizontally and vertically so as to generate a grid of the surface.
- this technology is very sensitive to sunlight, which is loaded with infrared radiation, as well as the environment (dirt).
- the surface must be flat.
- the cost is high and increases rapidly depending on the size of the surface to make touch. If one wishes to reduce this cost, it also significantly reduces the performance of the touch interface.
- Another solution is then to have a number of mechanical stress sensors against the shell to make touch regardless of its size and to apply a method based on a measurement of the respective stresses exerted on each sensor during a touch to deduce by barycentric calculation, the location of the touch.
- a method is for example disclosed in US Patent 3,657,475.
- a minimum of two sensors is required for a one-dimensional location of the touch with respect to an axis.
- a minimum of three sensors is necessary for a two-dimensional location, knowing that four sensors arranged at the four corners of a flat rectangular shell allow to obtain satisfactory results with a good stability of the assembly.
- US Pat. No. 3,657,475 describes four sensors interposed between a fixed support and a tactile surface at the four corners of the latter. These sensors are strain gages or piezoelectric sensors. They must, on the one hand, support the empty weight of the touch surface and, on the other hand, remain sensitive to touches whose strength or pressure is added to the weight of this touch surface. The force of the touch can not be too small compared to the weight of the surface not to induce problems of sensitivity as well as accuracy. In addition, the sensors used in this document are quite expensive and the piezoelectric sensors in particular are sensitive to temperature variations.
- the invention relates more specifically to a touch screen interface against which are placed mechanical stress sensors, for example capacitive sensors deemed inexpensive.
- the capacitive sensors themselves can cause sensitivity or accuracy problems such as those mentioned above.
- the stress measured by the capacitive sensors is normal to the surface of the shell. It is therefore a function of the inclination of the capacitive sensors and can vary greatly during use if the touch shell against which the capacitive sensors are arranged changes inclination.
- a touch interface with a shell support, a tactile shell and mechanical stress sensors that makes it possible to overcome at least some of the aforementioned problems and constraints, in particular a touch-shell interface having a peripheral zone. intended to be worn, in particular by fixing or embedding, by its support.
- a peripheral zone complementary to the main zone, intended to be carried by the hull support
- each fixing element establishes a localized fixing of the tactile shell against the shell support, at the boundary between the peripheral zone and the main zone in which the sensor with which it is associated is arranged, and
- each sensor integral with the non-zero constant distance shell support of the localized fastening established by the fastening element with which it is associated, undergoes a predetermined minimum mechanical vacuum stress; so as to generate a mechanically prestressed vacuum pivot connection between the touch shell and the shell support around said localized attachment.
- the tactile sensitivity of the resulting interface in its main zone is made independent of any fasteners or recesses the hull in its peripheral area because there is no resumption of effort beyond the boundary between the main zone and the peripheral zone.
- the touch interface may be arranged vertically with any suitable fixing or embedding means to maintain it in position in the peripheral zone of its touch shell without this imposes shear stresses on the sensors and without this hinders measurements.
- any stress applied to the first face accessible to the touch of the tactile shell generates, thanks to the pivot connections also, a measurable force torque at each sensor, the measurements of these couples making it possible to find the location of the stress by a barycentric calculation similar to that taught in US Patent 3,657,475.
- a touch interface according to the invention may further comprise:
- each pivot link generated by one of the sensors and the fastening element with which it is associated, has a lever arm length defined by the distance between said localized attachment and the point of contact between said sensor. and the touch shell, and:
- the estimating and locating means are programmed to deduce the location of the constraint applied solely on the basis of the measured electrical magnitudes and the predetermined minimum mechanical dead load, the lever arm lengths being otherwise equal, or
- the estimation and location means are programmed to deduce the location of the constraint applied on the basis of the quantities measured minimum electrical stress, and each of the lever arm lengths. Also optionally, the predetermined minimum mechanical vacuum stresses imposed by the fastening elements associated with the sensors cause a convex deformation of the first face accessible to the touch of the tactile shell as it moves away by at most 1 mm from its conformation without any constraint.
- a touch interface according to the invention may comprise two sensors and two associated fasteners for a one-dimensional location of stress applied against the first face accessible to the touch.
- a touch interface according to the invention may comprise at least three sensors and at least three associated fasteners for a two-dimensional stress location applied against the first face accessible to the touch.
- each fastener associated with each sensor is a screw and nut system passing through the shell support and the touch shell.
- the tactile shell is formed of a material having elastic properties
- the shell support comprises at least one embedding element of at least part of the peripheral zone of the tactile shell.
- the touch shell is a plate.
- FIG. 1 is a diagrammatic and front view of the general structure of a touch interface according to an embodiment of the invention
- FIG. 2 is a sectional view along an axis AA of the tactile interface of FIG. 1,
- FIG. 3 diagrammatically and in front view the general structure of a touch interface according to another embodiment of the invention
- - Figure 4 is a sectional view along an axis AA of the touch interface of Figure 3.
- the touch interface 10 shown in front view in Figure 1 comprises a support 12A, 12B and a touch shell 14 to be carried by the support 12A, 12B.
- the touch shell 14 is more precisely a rectangular plate in the example of Figure 1, formed in a material having elastic properties.
- the shell support 12A, 12B comprises at least one element for embedding or fixing the plate 14 in the vicinity of its edges, for example two uprights 12A and 12B shown vertically in FIG. 1.
- the touch shell 14 may be generally of shape, size, material (x) and any arrangement and its support 12A, 12B can wear it in different ways, by fixing, embedding or other, taking any suitable form.
- the plate 14 has a main area 16 without attachment, sensitive to touch. It also has a peripheral zone 18 intended to be carried by the support 12 and complementary to the main zone 16. This peripheral zone 18 is shown in gray in FIG. As will be seen later, this peripheral zone 18 is rendered insensitive to touching and does not disturb the detections of touches in the main zone 16.
- the plate 14 also has a first face 20, visible in Figure 1, accessible to the touch of a user and a second face 22, opposite to the first face 20, against which are arranged in abutment, in the main zone 16, four mechanical stress sensors C1, C2, C3, C4 integral with the support 12A, 12B.
- These sensors can be piezoelectric, capacitive or other. Preferably, they are capacitive because they are less expensive. More specifically, the capacitive sensor C1 is disposed against the upper left portion of the main zone 16 by being fixed to the amount 12A of the support 12A, 12B. The capacitive sensor C2 is disposed against the upper right portion of the main zone 16 while being fixed to the upright 12B of the support 12A, 12B.
- the capacitive sensor C3 is disposed against the lower left portion of the main zone 16 while being fixed to the upright 12A of the support 12A, 12B.
- the capacitive sensor C4 is disposed against the lower right portion of the main zone 16 while being fixed to the upright 12B of the support 12A, 12B.
- the element F1 attachment associated with the capacitive sensor C1 consisting for example of a screw and nut system passing through the plate 14 and the 12A upright 12A, 12B so as to establish a localized fixing of the plate 14 against its support 12A, 12B, is disposed in the upper left portion of the touch interface 10 near and constant non-zero distance capacitive sensor C1, at the boundary between the peripheral zone 18 and the main zone 16.
- the fastening element F2 associated with the capacitive sensor C2 constituted for example also by a screw and nut system passing through the plate 14 and the amount 12B of the support 12A , 12B so as to establish a localized fixing of the plate 14 against its support 12A, 12B, is disposed in the upper right portion of the touch interface 10 near and at a non-zero constant distance from the capacitive sensor C2, at the boundary between the peripheral zone 18 and the main zone 16.
- the fastening element F4 associated with the capacitive sensor C4 also consisting for example of a screw and nut system passing through the plate 14 and the amount 12B of the support 12A , 12B so as to establish a localized fixing of the plate 14 against its support 12A, 12B, is disposed in the lower right portion of the touch interface 10 near and at a non-zero constant distance from the capacitive sensor C4, at the boundary between the peripheral zone 18 and the main zone 16.
- fasteners themselves that define the boundary between the main zone 16 and the peripheral zone 18 of the plate 14.
- the fasteners By being disposed between the capacitive sensors and the edges of the plate 14 so as to these places the plate 14 against its support 12A, 12B, they generate this peripheral zone 18 to the edges of the plate 12 in which no touch can be detected or even affect the measurements taken by the capacitive sensors C1, C2, C3 and C4 .
- they are more precisely disposed on the side of the peripheral zone 18.
- the relative arrangement of the fastening elements F1, F2, F3, F4 and capacitive sensors C1, C2, C3, C4 on the uprights 12A and 12B is designed, in a manner known per se and in particular by varying the thickness capacitive sensors, so that each capacitive sensor undergoes a predetermined minimum mechanical stress to vacuum so as to generate a pivot connection mechanically vacuum preload between the plate 14 and the support 12A, 12B around the localized fastening materialized by the fastening element with which it is associated.
- empty means without any user touch on the touch-sensitive side 20.
- This predetermined minimum vacuum stress can be as close as desired to the zero value while remaining positive. In other words, it can tend asymptotically to zero by positive values according to the needs and constraints of a person skilled in the art.
- the tactile sensitivity of the plate 14 in its main zone 16 is made independent of any other fasteners or recesses in its peripheral zone 18 because there is no resumption of stresses beyond the boundary generated by the fasteners associated with capacitive sensors.
- the touch interface 10 may be arranged with any suitable fixing or embedding means to maintain it in a vertical position in the peripheral zone 18 of the plate 14 without this imposing shear stresses on the capacitive sensors C1, C2, C3, C4 and without affecting their measurements.
- the capacitive sensors C1, C2, C3, C4 are electrically connected to a device 24 for measuring their respective capacities.
- This measuring apparatus 24 is known per se according to several possible embodiments and will not be detailed. It is itself connected to a calculator 26 forming means for estimating and locating a stress applied against the first face 20 as a function of the measured capacitances and the predetermined minimum minimum mechanical stress on each of the capacitive sensors.
- the predetermined minimum mechanical vacuum stress imposed on each of the capacitive sensors gives it a vacuum capacity. It is the difference, noted AC ⁇ for the capacitive sensor Ci, between this vacuum capacity and the capacity measured at a given instant which gives, in combination with the associated lever arm length, a torque force indicator value. exerting on the capacitive sensor Ci under the action of a stress applied against the first face 20 at this given instant.
- AC ⁇ for the capacitive sensor Ci
- the computer 26 thus operates as follows. Upon receipt of the measured capacitances, he deduces the constraints relating to a touch against the first face 20 which are exerted on the four capacitive sensors C1, C2, C3, C4 by subtraction of the known vacuum capacities. Then, according to a first variant in which the lengths of the four lever arms (F1, C1), (F2, C2), (F3, C3) and (F4, C4) are equal, the estimated stresses are directly translated into coefficients of barycentric weighting since they directly represent the amplitudes of the couples of forces exerted on the four capacitive sensors C1, C2, C3, C4.
- each lever arm length is multiplied by estimated stress on the corresponding capacitive sensor and it is the result of these products that serves as a set of barycentric weighting coefficients.
- the computer 26 may for example be implemented in a computing device such as a conventional computer having a processor associated with one or more memories for storing data files and instructions of computer programs. His calculations could also be at least partly micro programmed or micro wired in dedicated integrated circuits. Thus, alternatively, the computer device implementing the computer 26 could be replaced by an electronic device consisting solely of digital circuits (without a computer program) for carrying out the same actions.
- FIG 2 shows the tactile interface 10 in section along the axis AA of Figure 1 and on an enlarged scale.
- Each of the uprights 12A and 12B presents in this nonlimiting example an "L" -shaped section so as to have the capacitive sensors C1, C2, C3, C4 in a predetermined minimum mechanical stress situation by fixing the plate 14 against the amounts 12A and 12B using the fasteners F1, F2, F3, F4.
- This situation is obtained by ensuring that the surface of each capacitive sensor in contact with the second face 22 of the plate 14 slightly, for example imperceptibly, the surface of contact between the plate 14 and its support 12A, 12B .
- This causes a convex general deformation of the first face 20 of the plate 14 which may itself be imperceptible.
- this deformation is such that the plate 14 moves away at most 1 mm from its plane conformation without any constraint.
- a particular advantage of this convex deformation is to increase the sensitivity of the touch interface.
- the plate 14 thus deformed in fact tends to want to return to its original shape without any constraint, so that any even minimal stress applied by a user against the first face 20 accessible to the touch goes in the direction of this return of the plate 14 to its original form and is easily detected.
- the plate 14 achieves an axis of maximum touch sensitivity along which the plate 14 is particularly stretched by prestressing. Another axis of maximum touch sensitivity is obtained by similarly aligning the fasteners and associated capacitive sensors F3, C3, F4, 04.
- the capacitive sensors can not be fixed directly on the uprights 12A and 12B, but on transverse strips 28. - even attached to the amounts 12A and 12B. It is also possible to provide a frame supporting the capacitive sensors 01, 02, 03, 04 and fixed by screwing to the plate 14 through the fastening elements F1, F2, F3, F4 without the need for the amounts 12A and 12B. In this case, it is the frame that fulfills the plate support function.
- each mechanical stress sensor 01, 02, 03, 04 to the support 12A, 12B is rigid: that is, it does not allows no degree of freedom between the mechanical stress sensor C1, C2, C3 or C4 considered and the support 12A, 12B.
- the local fasteners of the plate 14 to the support 12A, 12B using the fasteners F1, F2, F3, F4 are locally rigid: that is to say that they do not locally allow any degree of freedom between the plate 14 and the support 12A, 12B.
- this support 12A, 12B is itself rigid, so that no degree of freedom is allowed between the mechanical stress sensors C1, C2, C3, C4 and the fastening elements F1, F2, F3, F4 which are respectively associated with them: in other words, any relative mobility between the mechanical stress sensors C1, C2, C3, C4 and the fixing elements F1, F2, F3, F4 is prohibited. This is what generates the pivot links defined above, by elasticity of the plate 14.
- a touch interface such as one of those described above makes it possible to use mechanical stress sensors, in particular capacitive sensors deemed to be inexpensive, while remaining insensitive to the conditions at the limits of fixing or embedding and insensitive as well. tilt, including vertical, its shell or touch plate.
- Such a tactile interface is particularly suitable for the detection of relative gestures, that is to say, successive touches whose exact location is less important than the recognition of the gesture they reproduce.
- two capacitive sensors and two associated fasteners may be sufficient for a one-dimensional stress location applied against the first face accessible to the touch. At least three capacitive sensors and at least three associated fasteners are required for two-dimensional localization. More sensors and associated fasteners may be further provided to homogenize the sensitivity of the hull or touchplate by increasing the number of axes of maximum sensitivity.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Human Computer Interaction (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR1556412A FR3038747A1 (fr) | 2015-07-07 | 2015-07-07 | Interface tactile a support de coque, coque tactile et capteurs de contrainte mecanique |
| PCT/FR2016/051716 WO2017006057A1 (fr) | 2015-07-07 | 2016-07-06 | Interface tactile à support de coque, coque tactile et capteurs de contrainte mécanique |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| EP3320418A1 true EP3320418A1 (fr) | 2018-05-16 |
Family
ID=54260931
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP16747828.8A Withdrawn EP3320418A1 (fr) | 2015-07-07 | 2016-07-06 | Interface tactile à support de coque, coque tactile et capteurs de contrainte mécanique |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US10488998B2 (fr) |
| EP (1) | EP3320418A1 (fr) |
| FR (2) | FR3038747A1 (fr) |
| WO (1) | WO2017006057A1 (fr) |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2413221A (en) * | 1944-10-21 | 1946-12-24 | Elston Edward Percy | Garment hanger |
| US3657475A (en) | 1969-03-19 | 1972-04-18 | Thomson Csf T Vt Sa | Position-indicating system |
| US4511760A (en) * | 1983-05-23 | 1985-04-16 | International Business Machines Corporation | Force sensing data input device responding to the release of pressure force |
| CA2072730A1 (fr) | 1991-09-09 | 1993-03-10 | Richard L. Garwin | Montage sur support de deformation pour ecran tactile a detection d'efforts |
| FR2874274B1 (fr) | 2004-08-11 | 2007-07-20 | Sensitive Object | Procede pour localiser un impact sur une surface et dispositif pour la mise en oeuvre de ce procede |
| KR20100015501A (ko) * | 2007-03-15 | 2010-02-12 | 에프-오리진, 인크. | 힘 감응 터치 스크린의 마찰 없는 이동을 위한 집적된 특성 |
| JP5197457B2 (ja) * | 2009-03-25 | 2013-05-15 | 三菱電機株式会社 | 座標入力表示装置 |
| WO2011098854A1 (fr) | 2010-02-11 | 2011-08-18 | Varidal Company Limited | Procédé pour la détection d'un corps vis-à-vis d'une surface, dispositif de détection pour la mise en œuvre du procédé, et surface comprenant un tel dispositif |
| FR3003030B1 (fr) | 2013-03-11 | 2015-04-17 | Commissariat Energie Atomique | Dispositif de detection de contrainte mecanique a capteur capacitif, ensemble de dispositifs de detection et dispositif de localisation de toucher a capteurs capacitifs |
-
2015
- 2015-07-07 FR FR1556412A patent/FR3038747A1/fr active Pending
-
2016
- 2016-07-06 US US15/742,295 patent/US10488998B2/en not_active Expired - Fee Related
- 2016-07-06 WO PCT/FR2016/051716 patent/WO2017006057A1/fr not_active Ceased
- 2016-07-06 EP EP16747828.8A patent/EP3320418A1/fr not_active Withdrawn
- 2016-07-06 FR FR1656486A patent/FR3038746B1/fr not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| FR3038747A1 (fr) | 2017-01-13 |
| WO2017006057A1 (fr) | 2017-01-12 |
| FR3038746A1 (fr) | 2017-01-13 |
| FR3038746B1 (fr) | 2018-10-12 |
| US20180203543A1 (en) | 2018-07-19 |
| US10488998B2 (en) | 2019-11-26 |
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