Input device for inputting control commands into a digital computer, and method for operating an input device

Abstract

The invention relates to an input device (1) for inputting control commands into a digital computer (2), the input device (1) comprising: - a base (3); - an input element (4) which is received on the base (3) so as to be displaceable in a displacement direction (5), wherein the input element (4) has an actuation surface (7) for actuation by a user; - a braking device (14) for influencing a displacement resistance of the input element (4) with respect to the base (3), characterised in that the braking device (14) comprises the following elements: - a coil (15) for generating a magnetic field, wherein the coil (15) is wound around a winding axis (16); - a coil core (17); - a first friction surface (19) which is coupled to the base (3); - a second friction surface (20) which is coupled to the input element (4), wherein a pressing force of the first friction surface (19) against the second friction surface (20) can be changed by means of the magnetic field generated by the coil (15), as a result of which the displacement resistance of the input element (4) can be influenced.

Description

[0001] INPUT DEVICE FOR INPUTTING CONTROL COMMANDS INTO A DIGITAL COMPUTER, AND A METHOD FOR OPERATING AN INPUT DEVICE

[0002] The invention relates to an input device for entering control commands into a digital computer, as well as a method for operating an input device.

[0003] US11048344B1 discloses in Fig. 10 a key housed in a key housing, a return spring for the key, a permanent magnet, an electrical winding, and a magnetorheological fluid arranged between the key and the key housing and defined by two O-rings. The electrical winding can be used to influence the properties of the magnetorheological fluid, thereby influencing the resistance force during key movement.

[0004] The design disclosed in US11048344B1 has the disadvantage that the magnetorheological fluid can escape from its intended position over time. Furthermore, the O-rings of the known button are subject to wear and can become brittle. The design disclosed in US11048344B1 therefore has an insufficient service life.

[0005] The object of the present invention was to overcome the disadvantages of the prior art and to provide a device and a method which has an improved service life.

[0006] This object is achieved by a device and a method according to the claims.

[0007] According to the invention, an input device is designed for inputting control commands into a digital computer. The input device comprises:

[0008] - a base;

[0009] - an input element which is slidably received on the base in a sliding direction, wherein the input element has an actuating surface for actuation by a user;

[0010] - a braking device for influencing a resistance to displacement of the input element to the base, characterized in that the braking device comprises the following elements:

[0011] - a coil for generating a magnetic field, the coil being wound around a winding axis;

[0012] - a coil core;

[0013] - a first friction surface coupled to the base;

[0014] - a second friction surface which is coupled to the input element, wherein a contact force of the first friction surface on the second friction surface can be changed by means of the magnetic field generated by the coil, whereby the displacement resistance of the input element can be influenced.

[0015] The input device according to the invention has the advantage of being robust yet space-saving. This makes it easy to integrate the input device into an electronic component, such as a keyboard or other input device arrangement. Furthermore, the braking device according to the invention allows the displacement resistance of the input element to be easily and effectively influenced, thereby achieving precise haptic feedback at the input element. Furthermore, the design of the input device according to the invention allows the haptic feedback to be precisely adjusted in the form of a modified displacement resistance, thus achieving an improved user experience.In summary, the input device according to the invention thus has the advantage that, surprisingly, a combination of improved robustness and, at the same time, improved haptic feedback on the input element can be achieved.

[0016] In particular, it can be provided that the displacement of the input element relative to the base is a linear displacement. The displacement direction can thus be a straight line.

[0017] Furthermore, the input device can include a detection means for detecting a displacement of the input element. The detection means can also be installed outside the input device, and the displacement of the input element can be detected by an external sensor system, for example, by optical sensors.

[0018] The detection means can be designed to detect the incremental or absolute position of the input element relative to the base. In an alternative variant, the detection means can be designed to detect end positions and / or intermediate positions of the input element relative to the base.

[0019] Furthermore, it can be provided that the input device, in particular the detection means and the coil, are coupled to a circuit board. The circuit board can comprise electronic components arranged thereon. In particular, it can be provided that the circuit board comprises a microcontroller. Furthermore, it can be provided that the circuit board, in particular the microcontroller, can be coupled to the digital computer. In particular, it can be provided that the signal from the input device is converted into a digital signal for transmission to the digital computer by means of the circuit board. Furthermore, it can be provided that a digital control command from the digital computer for energizing the coil is converted into an actual energization of the coil by means of the circuit board. In particular, it can be provided that a transistor is arranged on the circuit board and is designed to switch the energization of the coil.

[0020] A first option for establishing a data connection between the circuit board, such as one installed in a keyboard or joystick, and the digital computer is the use of a wired interface. This interface can be implemented using standardized connecting cables that ensure reliable and fast data transmission. The direct contact between the circuit board and the digital computer allows data to be transmitted with minimal latency and maximum accuracy. Furthermore, the cable can transmit the electrical power required to power the coil.

[0021] Another option for connecting data between a circuit board in a keyboard and a digital computer is wireless technology. This utilizes wireless communication protocols such as Bluetooth or Wi-Fi, enabling a flexible and convenient connection without the need for physical cables. This wireless connection offers the advantage of mobility, as the keyboard or joystick can be moved freely without being tied to a cable. It enables seamless data transmission over short to medium distances. The development of efficient power management systems combined with modern battery technologies ensures sufficient operating time even when power is required to the coil. The displacement resistance of the input element can be influenced by varying the current strength of the coil.This can be achieved by influencing the magnetic field created by applying different current strengths to the coil.

[0022] Furthermore, it may be expedient for the input element to comprise a button, with the actuation surface being arranged on a cover surface of the button, with the second friction surface extending at a right angle to the cover surface of the button. Especially with buttons, the design according to the invention can achieve an improved actuation experience.

[0023] Furthermore, the input element can comprise a key carrier, with the key being arranged on the key carrier. By providing a separate key carrier, keys of various designs can be accommodated on the key carrier. This makes it easy to replace conventional key carriers without a braking device or key carriers with a differently designed braking device with the key carriers according to the invention.

[0024] Furthermore, it can be provided that the second friction surface is arranged on a friction element made of a ferromagnetic material, and the first friction surface is formed on the coil core. This has the advantage that the friction element can serve to conduct the magnetic field, or that the magnetic field lines can lead through the friction element, whereby the air gap between the friction element and the coil core can be zero due to the contact of the first friction surface and the second friction surface. In other words, the friction element can be designed as a yoke, which closes the magnetic circuit or the magnetic flux.

[0025] In an alternative embodiment, it is also conceivable for a movable yoke to be coupled to the input element, wherein the movable yoke can be attracted to the coil core when the coil is energized by the generated magnetic field, and wherein the second friction surface, which can be arranged on the input element, and the first friction surface, which can be arranged on the base, can lie outside the generated magnetic field. In this case, plastic components can be used for the first friction surface or for the second friction surface, whereby the friction properties can be changed or improved. This can influence the displacement resistance. By structurally designing the first friction surface and the second friction surface orBy arranging these two friction surfaces on different components, a magnetic attraction between the first friction surface and the second friction surface or a magnetic repulsion between the first friction surface and the second friction surface can be achieved.

[0026] Furthermore, it can be provided that the friction element has a friction element coating in the region of the first friction surface, which serves to increase the coefficient of friction and / or to protect the friction element from corrosion, in particular that the first friction surface is arranged on the friction element coating, in particular that the friction element coating is ferromagnetic. This has the advantage that improved functionality can be achieved through this measure. In particular, this measure can prevent the first friction surface from rusting onto the second friction surface, as a result of which good functional retention of the input device can be achieved over its service life. Furthermore, this measure can harden the surface, as a result of which wear can be reduced. A ferromagnetic coating can improve the course of the magnetic field lines.

[0027] Furthermore, it can be provided that the coil core has a coil core coating which serves to increase the coefficient of friction and / or to protect the iron core from corrosion, in particular that the second friction surface is arranged on the coil core coating, in particular that the coil core coating is ferromagnetic. This has the advantage that this measure can achieve improved functionality. In particular, this measure can prevent the first friction surface from rusting onto the second friction surface, as a result of which good functional retention of the friction damper can be achieved over its service life. Furthermore, this measure can harden the surface, as a result of which wear can be reduced. A ferromagnetic coating can achieve an improved course of the magnetic field lines.

[0028] Furthermore, it can be provided that the friction element is rigidly mounted on the key or on a key carrier. This has the advantage that the friction element can be easily embedded in the key or key carrier. For example, it is conceivable for the friction element to be injected or cast into the key or key carrier. Another advantageous embodiment is one in which it can be provided that the coil core is mounted on the base so that it can be displaceable in an axial direction of a winding axis. This measure allows the coil core to be attracted to the friction element when the electromagnet is energized or to rest against it in order to influence the friction.

[0029] In an alternative embodiment, it is also conceivable that the coil core is pressed against the friction element by a spring element and, when the coil is energized, the pressing force of the coil core against the friction element is reduced, whereby the friction can be reduced.

[0030] In particular, it can be provided that the base has a coil receptacle in which the coil together with the coil core is accommodated displaceably in the axial direction of the winding axis.

[0031] In an alternative embodiment, it can be provided that the friction element is mounted on the key or key support so as to be displaceable in a direction of movement relative to the key or key support, wherein the direction of movement is formed at a right angle to the second friction surface. In such an embodiment, the friction element, in particular the second friction surface, which can be arranged on the friction element, can be attracted to the first friction surface or repelled by the first friction surface, whereby the contact force of the first friction surface against the second friction surface can be varied and the displacement resistance of the input element can thus be influenced.

[0032] Furthermore, it may be advantageous to have a recess in the key or key support for the friction element to be slidably accommodated in a form-fitting manner. This offers the advantage that the friction element can be easily inserted into the key or key support.

[0033] Furthermore, it can be provided that the first friction surface is formed on the coil core and that the friction element and the coil core are positioned relative to one another such that, when the coil is energized, the friction element is pressed against the coil core, with the magnetic field being conducted through the coil core and the friction element. This has the advantage that this measure can create solid-state friction between the friction element and the coil core. This allows for a simple design of the input device. Furthermore, the input device with this design can be highly effective.

[0034] Furthermore, it can be expedient if a third friction surface is formed which is coupled to the base and a fourth friction surface is formed which is coupled to the input element, wherein a contact force of the third friction surface on the fourth friction surface can be varied by means of the magnetic field generated by the coil, wherein the second friction surface and the fourth friction surface are formed symmetrically to a plane of symmetry of the input element. This has the advantage that this measure can achieve a symmetrical application of force to the input element, whereby a tilting moment on the input element caused by the induced normal forces or friction forces can be prevented. Tilting of the input element and the resulting jamming of the input element can be avoided as far as possible.Overall, this measure can improve the functionality of the input device and also improve the user experience when operating the input device.

[0035] Furthermore, a return spring can be provided for returning the input element to an initial position, wherein the coil core has a central recess in the region of the winding axis, wherein the return spring is accommodated in the central recess. This has the advantage that this measure allows for a simple symmetrical return of the input element, thus preventing jamming of the input element.

[0036] Furthermore, it can be provided that the first friction surface and / or the second friction surface are arranged outside the effective range of the generated magnetic field. This has the advantage that the bodies on which the first friction surface and / or the second friction surface are arranged do not necessarily have to be ferromagnetic. Thus, the first friction surface and / or the second friction surface can be formed, for example, from a plastic material with good sliding properties. This has the surprising advantage that the haptic behavior of the input device can be improved. Outside the effective range of the generated magnetic field in this context does not mean that the magnetic field does not reach the first friction surface and / or the second friction surface, but rather that the field lines of the magnetic field are not concentrated over the first friction surface and / or the second friction surface.

[0037] In particular, the return spring can be made of a non-ferromagnetic material. This has the advantage that the coil, or the magnetic field generated when the coil is energized, has no influence on the properties or action of the return spring.

[0038] Furthermore, it can be provided that the coil core is divided into a first coil core part and a second coil core part along the winding axis. This offers the advantage that the coil core parts can have a complex geometry, while a fully wound coil can still be joined to the coil core parts or accommodated between the coil core parts.

[0039] In particular, it can be provided that the first coil core part is designed as a deep-drawn part.

[0040] Furthermore, it can be provided that the second coil core part is designed as a deep-drawn part.

[0041] In particular, it can be provided that the first coil core part has a first cylinder section and a first flange section.

[0042] Furthermore, it can be provided that the second coil core part has a second cylinder section and a second flange section.

[0043] According to the invention, a keyboard with multiple input devices for inputting control commands into a digital computer is provided. At least one of the input devices is designed according to one of the above embodiments.

[0044] Particularly in a keyboard, the input device according to the invention is suitable for improving the keyboard with regard to its technical structure or for improving the operating feel when using the keyboard.

[0045] According to the invention, a vehicle or work machine can also be provided with at least one input device for inputting control commands into a digital computer. Here, too, the input device is designed according to one of the above embodiments. In a vehicle or work machine, the input device according to the invention offers the advantage that the operability of the vehicle or work machine can be improved by the inventive features. This not only provides an improved user experience, but also improves safety in connection with the operation of the vehicle or work machine.

[0046] According to the invention, a method for operating an input device is provided. The input device is coupled to a digital computer and serves to input control commands into the digital computer. The method comprises the following steps:

[0047] - detecting a position of the input element by means of a detection means;

[0048] - Energizing the coil and thus generating a magnetic field when this is specified by the digital computer and thereby changing the contact force of the first friction surface on the second friction surface, which influences the displacement resistance of the input element.

[0049] The method according to the invention has the advantage that the method features can achieve an improved user experience when using the input device.

[0050] Furthermore, it may be advantageous to increase the contact force between the first friction surface and the second friction surface when energizing the coil, thus increasing the displacement resistance of the input element. This has the advantage that, when the coil is de-energized, the displacement resistance of the input element can be low. Thus, energization is only necessary when the displacement resistance of the input element needs to be increased. This results in a particularly energy-efficient operation.

[0051] In an alternative embodiment, it can be provided that when the coil is energized, the contact force of the first friction surface against the second friction surface is reduced, thus reducing the displacement resistance of the input element. This is particularly advantageous if a high displacement resistance is desired as standard and the displacement resistance is only to be reduced in certain exceptional cases. When the coil is energized, the first friction surface and the second friction surface can be repelled from one another by the generated magnetic field. In particular, it can be provided that the first friction surface and the second friction surface are preloaded towards one another by means of a spring element and pressed against one another.Furthermore, it can be provided that the digital computer predetermines the energization of the coil when the input element is moved to a specific position by a user, which is detected by the detection means. This has the advantage that, thanks to this measure, the input element can have a first displacement resistance in a specific displacement range and a second displacement resistance in a further displacement range, which is different from the first displacement resistance. The distribution of these displacement ranges or the position of the input element at which the coil is energized can be individually specified as required.

[0052] Furthermore, the braking device can be dimensioned such that, starting at a current threshold of the coil within the operating range, the braking effect is greater than the return force of the return spring. This has the advantage that this measure allows the input element to be held in any position from the rest position to the actuated position. Thus, the input element can remain in an actuated position.

[0053] A copper material can be used as the material for the coil.

[0054] A ferromagnetic material can be used for the coil core. This could be an iron material, for example.

[0055] A ferromagnetic material can be used for the outer shell. This could, for example, be an iron material.

[0056] A ferromagnetic material can be used as the material for the friction element. This could be, for example, an iron material. Furthermore, the friction element can also be composed of several parts, with different materials being used for the individual parts. In particular, a part made of an iron material can be embedded in a part made of a plastic material.

[0057] A ferromagnetic material can be used for the hollow cylinder body. This could, for example, be an iron material.

[0058] A plastic can be used as the material for the base. A plastic can be used as the material for the input element. In particular, the key carrier can be made of a plastic material. Furthermore, the key can also be made of a plastic material.

[0059] For a better understanding of the invention, it is explained in more detail using the following figures.

[0060] They show in a highly simplified, schematic representation:

[0061] Fig. 1 is a sectional view of a first embodiment of an input device according to section line II of Fig. 3 in a rest position;

[0062] Fig. 2 is a sectional view of the first embodiment of the input device according to section line II of Fig. 3 in an actuating position;

[0063] Fig. 3 is a sectional view of the first embodiment of the input device along section line III-III of Fig. 1 in an actuating position;

[0064] Fig. 4 is a sectional view of a second embodiment of an input device in a rest position;

[0065] Fig. 5 is a sectional view of a third embodiment of an input device in a rest position;

[0066] Fig. 6 is a sectional view of the third embodiment of the input device in an actuating position;

[0067] Fig. 7 is a perspective view of a key of the third embodiment of the input device;

[0068] Fig. 8 is a schematic representation of components of a fourth embodiment of the input device;

[0069] Fig. 9 is a top view of a keyboard with multiple input devices.

[0070] By way of introduction, it should be noted that in the variously described embodiments, identical parts are provided with identical reference symbols or component designations. The disclosures contained throughout the description can be applied analogously to identical parts with identical reference symbols or component designations. Furthermore, the positional information chosen in the description, such as top, bottom, side, etc., refers to the directly described and illustrated figure, and these positional information must be applied analogously to the new position in the event of a change in position.

[0071] Fig. 1 shows a sectional view of a first embodiment of an input device 1 for inputting control commands into a digital computer 2. Section line II from Fig. 3 was chosen as the section line. Figure 2 shows the first embodiment of the input device 1 in a further position, but in the same sectional view as shown in Fig. 1. Figure 3 shows the first embodiment of the input device 1 in a further sectional view.

[0072] The further description of the first embodiment of the input device 1 is based on a synopsis of Figures 1 to 3.

[0073] In particular, it can be provided that the input device 1 is coupled to a means for data connection with the digital computer 2. Furthermore, it can be provided that the input device 1 comprises a power supply by means of which it is supplied with power.

[0074] As can be seen from Fig. 1, it can be provided that the input device 1 comprises a base 3, on which an input element 4 can be received. In particular, it can be provided that the input element 4 is coupled to the base 3 so that it can be displaced relative to the base 3 in a displacement direction 5. In this case, it can be provided that a guide receptacle 6 is formed in the base 3 and that the input element 4 is designed to be complementary in shape to the guide receptacle 6, so that the input element 4 is displaceably received in the guide receptacle 6. In particular, a sliding guide can be realized between the input element 4 and the base 3.

[0075] In particular, it can be provided that the input element 4 has an actuating surface 7. The actuating surface 7 can be freely accessible so that a user can, for example, touch the actuating surface 7 with his finger. The user can thus exert pressure on the actuating surface 7 and move the input element 4 in the displacement direction 5 relative to the base 3. As can also be seen from Fig. 1, it can be provided that the input element 4 comprises a button 8, on which the actuating surface 7 can be arranged. In particular, it can be provided that the actuating surface 7 is arranged on a cover surface 9 of the button 8. Furthermore, it can be provided that the input element 4 comprises a button carrier 10, which can be slidably received in the guide receptacle 6. In particular, it can be provided that the button 8 is received on the button carrier 10.In particular, it can be provided that the key 8 is plugged onto the key carrier 10 by means of a positive and frictional connection.

[0076] Furthermore, it can be provided that a return spring 11 is formed, which serves to return the input element 4 from an actuating position 12, as shown in Fig. 2, to a rest position 13, as shown in Fig. 1.

[0077] Furthermore, it can also be provided that several return springs 11 are formed. In particular, it can be provided that several return springs 11 are evenly distributed in the input device 1, so that the forces of the return spring 11 do not cause the input element 4 to tilt. In particular, it can be provided that the return spring 11 acts between the base 3 and the input element 4. As can be seen from Figs. 1 and 2, it can be provided that the return spring 11 acts between the base 3 and the key carrier 10.

[0078] In particular, it can be provided that the key carrier 10 is received in the base 3 in such a form-fitting manner that it forms a stop when urged into the rest position 13 by the return spring 11.

[0079] As can be further seen from Figs. 1 and 2, it can be provided that a braking device 14 is formed, which serves to influence the displacement resistance of the input element 4 to the base 3.

[0080] In particular, it can be provided that the braking device 14 comprises a coil 15 which is wound around a winding axis 16. In particular, it can be provided that the coil 15 is arranged in the braking device 14 such that the winding axis 16 is arranged at a right angle to the first friction surface 19. In particular, it can be provided that the coil 15 is received on a coil core 17. Furthermore, it can be provided that an outer shell 18 is formed which surrounds the coil 15 or the coil core 17. Furthermore, it can be provided that a first friction surface 19 is formed on the coil core 17 or the outer shell 18 and that a second friction surface 20 is formed on the input element 4, which second friction surface 20 interacts with the first friction surface 19. In particular, it can be provided that a corresponding friction force can be achieved by the first friction surface 19 bearing against the second friction surface 20 and the application of a normal force.

[0081] In particular, it can be provided that the second friction surface 20 is arranged on a friction element 21. The input element 4 can comprise the friction element 21. In particular, it can be provided that the friction element 21 is received in the key carrier 10. The friction element 21 can be injection-molded into the key carrier 10. In particular, it can be provided that the key carrier 10 is formed as an injection-molded part made of a plastic material.

[0082] Preferably, a friction element carrier 22 can be formed on the key carrier 10. The friction element 21 can be accommodated in the friction element carrier 22. In particular, it can be provided that, as can be seen from Fig. 1, the friction element carrier 22 is formed in the form of a web on the key carrier 10.

[0083] In the present embodiment of the input device 1, as shown in Figs. 1 and 2, it can be provided that the coil core 17, together with the coil 15 and the outer shell 18, is designed to be displaceable in the axial direction 23 of the winding axis 16 relative to the base 3. This measure allows the first friction surface 19 to be displaced relative to the second friction surface 20 in the normal direction of the friction surfaces, whereby the normal force of the two friction surfaces 19, 20 relative to one another can be varied and thus the friction force or the displacement resistance of the input element can be influenced.

[0084] In particular, it can be provided that a coil receptacle 24 is formed on the base 3, in which the outer shell 18 or the coil core 17 and the coil 15 are received. As can be seen from Fig. 1, it can be provided that the coil receptacle 24 has a recess 25 in which the outer shell 18 is received. A clearance fit can be formed between the recess 25 of the coil receptacle 24 and the outer shell 18, so that the outer shell 18 is received so that it can be displaced relative to the recess 25. In a further embodiment variant, not shown separately, it can also be provided that the outer shell 18 or the coil core 17 are rigidly received in the base 3 and that the two friction surfaces 19, 20 can be adjusted relative to one another by a corresponding displacement of the friction element 21.This can be achieved, for example, by accommodating the friction element 21 so that it can be displaced relative to the key carrier 10 in a direction of movement 26. In a further embodiment, it can also be provided that the displacement of the friction element 21 in the direction of movement 26 is achieved by the friction element carrier 22 being designed to be flexible and the spring-elastic property of the friction element carrier 22 being used to enable the movement of the friction element 21.

[0085] The functionality of the first embodiment of the input device will now be explained by comparing Figs. 1 and 2.

[0086] In the illustration in Fig. 1, the input element 4 is in its rest position 13. It can be held in this position by the spring force of the return spring 11. By pressing the user on the actuating surface 7 of the button 8, the input element 4 can be pushed against the spring force of the return spring 11 toward its actuated position 12. This movement or position of the input element 4 can be detected by a detection means 27.

[0087] The first friction surface 19 and the second friction surface 20 can slide against each other, with the normal force between the two friction surfaces 19, 20 being very low or zero. When a certain position of the input element 4 is reached, the coil 15 can be energized. This can create a magnetic field. The magnetic field is represented by field lines 28 arranged around the coil 15. The field lines 28 run through the coil core 17, the outer shell 18, and the friction element 21.

[0088] The magnetic field increases the normal force of the first friction surfaces 19 and the second friction surface 20 against each other, or rather, they are pressed against each other. This can increase the friction force, which can increase the displacement resistance of the input element. In particular, it can be provided that the current supply can be varied, which also allows the displacement resistance of the input element to be varied. Depending on the predetermined current supply modes, a wide variety of haptic feedback can be provided to the user. If the user now reduces their pressure on the actuating surface 7 and at the same time the friction force of the two friction surfaces 19, 20 is lower than the spring force of the return spring 11, corresponding to the current applied to the coil 15, the return spring 11 urges the input element 4 into the rest position 13, following the movement of the user's finger.

[0089] Fig. 4 shows a second embodiment of the input device 1, wherein the same reference numerals or component designations are used for the same parts as in the preceding Figs. 1 to 3. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figs. 1 to 3. In particular, it can be provided that a large part of the components of the second embodiment of the input device 1 are designed in the same way as in the first embodiment of the input device 1, thus eliminating the need to repeat the description.

[0090] As can be seen from Fig. 4, a preload device 29 can be provided, which serves to press the first friction surface 19 against the second friction surface 20 when the coil 15 is de-energized. The preload device 29 can, for example, be designed in the form of a spring element. Furthermore, the preload device 29 can also be designed in the form of a permanent magnet.

[0091] The braking device 14, in particular the coil 15, can be configured such that, when the coil 15 is energized, the contact force of the first friction surface 19 against the second friction surface 20 can be reduced against the force of the preload element 29. This measure can achieve a fundamentally increased displacement resistance of the input element 4 relative to the base 3, wherein the displacement resistance can be reduced when the coil 15 is energized. These mechanisms of the preload device 29 described in the second embodiment according to Fig. 4 can also be applied mutatis mutandis to the other embodiments.

[0092] Fig. 5 shows a third exemplary embodiment of the input device 1 in the rest position 13. Fig. 6 shows the third exemplary embodiment of the input device 1 in the actuated position 12. Fig. 7 shows the third exemplary embodiment of the input device 1 in a further perspective view, this further view serving to better understand the structure of the input device 1. Fig. 5 shows a sectional view of the second exemplary embodiment of the input device 1 for inputting control commands into the digital computer 2. The sectional plane chosen here is a section analogous to the representation in Fig. 1.

[0093] The further description of the first embodiment of the input device 1 is based on a synopsis of Figures 5 to 7.

[0094] In particular, it can be provided that the input device 1 is coupled to a means for data connection with the digital computer 2. Furthermore, it can be provided that the input device 1 comprises a power supply by means of which it is supplied with power.

[0095] As can be seen from Fig. 5, it can be provided that the input device 1 comprises a base 3, on which an input element 4 can be received. In particular, it can be provided that the input element 4 is coupled to the base 3 so that it can be displaced relative to the base 3 in a displacement direction 5. In this case, it can be provided that a guide receptacle 6 is formed in the base 3 and that the input element 4 is designed to be complementary in shape to the guide receptacle 6, so that the input element 4 is displaceably received in the guide receptacle 6. In particular, a sliding guide can be realized between the input element 4 and the base 3.

[0096] In particular, the input element 4 can be provided with an actuating surface 7. The actuating surface 7 can be freely accessible, so that a user can, for example, touch the actuating surface 7 with their finger. The user can thus exert pressure on the actuating surface 7 and move the input element 4 in the displacement direction 5 relative to the base 3.

[0097] As can further be seen from Fig. 5, it can be provided that the input element 4 comprises a button 8, on which the actuating surface 7 can be arranged. In particular, it can be provided that the actuating surface 7 is arranged on a cover surface 9 of the button 8. Furthermore, it can be provided that the input element 4 comprises a button carrier 10, which can be slidably received in the guide receptacle 6. In particular, it can be provided that the button 8 is received on the button carrier 10. In particular, it can be provided that the button 8 is plugged onto the button carrier 10 by means of a positive and frictional connection. Furthermore, it can be provided that a return spring 11 is formed, which serves to return the input element 4 from an actuating position 12, as shown in Fig. 6, to a rest position 13, as shown in Fig. 5.

[0098] In particular, it can be provided that the return spring 11 acts between the base 3 and the input element 4. As can be seen from Figs. 5 and 6, it can be provided that the return spring 11 acts between the base 3 and the key carrier 10.

[0099] In particular, it can be provided that the key carrier 10 is received in the base 3 in such a form-fitting manner that it forms a stop when urged into the rest position 13 by the return spring 11.

[0100] As can be further seen from Figs. 5 and 6, it can be provided that a braking device 14 is formed, which serves to influence the displacement resistance of the input element 4 to the base 3.

[0101] In particular, it can be provided that the braking device 14 comprises a coil 15 wound around a winding axis 16. In particular, it can be provided that the coil 15 is received on a coil core 17.

[0102] Furthermore, it can be provided that a first friction surface 19 is formed on the coil core 17 and that a second friction surface 20 is formed on the input element 4, which interacts with the first friction surface 19. In particular, it can be provided that a corresponding friction force can be achieved by the first friction surface 19 being in contact with the second friction surface 20 and the application of a normal force.

[0103] In particular, it can be provided that the second friction surface 20 is arranged on a friction element 21. The input element 4 can comprise the friction element 21. In particular, it can be provided that the friction element 21 is received in the key carrier 10.

[0104] In particular, it can be provided that the key carrier 10 is designed as an injection-molded part made of a plastic material which has form-fitting elements for receiving the friction element 21.

[0105] Preferably, it can be provided that a friction element carrier 22 is formed on the key carrier 10. The friction element 21 can be received in the friction element carrier 22. As can be seen from Figs. 5 to 7, it can be provided that the braking device 14 is designed symmetrically with respect to a plane of symmetry 37 of the input device 1. In particular, a second friction element 31 can be provided, which is received in a second recess 32 of the friction element carrier 22. The friction element 21 and the second friction element 31 can each be received on the key 8 or on the key carrier 10 so as to be displaceable in the direction of movement 26.

[0106] Furthermore, it can be provided that the coil 15 is designed such that the winding axis 16 is arranged parallel to the displacement direction 5 of the input element 4. Furthermore, it can be provided that the coil core 17 comprises a first coil core part 33 and a second coil core part 34. In other words, the coil core 17 can be composed of the first coil core part 33 and the second coil core part 34. In particular, it can be provided that the first coil core part 33 and the second coil core part 34 are designed to accommodate the coil 15.

[0107] Furthermore, it can be provided that a third friction surface 35 is formed on the coil core 17 and that a fourth friction surface 36 is formed on the input element 4, which cooperates with the third friction surface 35. In particular, it can be provided that a corresponding friction force can be achieved by the third friction surface 35 being in contact with the fourth friction surface 36 and by applying a normal force.

[0108] In particular, it can be provided that the first coil core part 33 has a first flange section 38 and a first cylinder section 39. Furthermore, it can be provided that the second coil core part 34 has a second flange section 40 and a second cylinder section 41. The coil 15 can be arranged on the cylinder section 39, 41 of the coil core parts 33, 34, respectively.

[0109] The first cylinder section 39 and the second cylinder section 41 can be rotationally symmetrical about the winding axis 16. In particular, it can be provided that the coil 15 is accommodated on the first cylinder section 39 and the second cylinder section 41.

[0110] The first flange section 38 and the second flange section 40 can enclose or delimit the coil 15 in the axial direction of the winding axis 16. In particular, it can be provided that the first friction surface 19 is formed on a first side of the first flange section 38 and the second flange section 40, and that the third friction surface 35 is formed on a second side of the first flange section 38 and the second flange section 40. Furthermore, it can be provided that the fourth friction surface 36 is arranged on the second friction element 31.

[0111] Furthermore, it can be provided that a central recess 42 is formed in the region of the first cylinder section 39 or the second cylinder section 41. The first cylinder section 39 and the second cylinder section 41 can thus be formed concentrically. In particular, it can be provided that the first cylinder section 39 or the second cylinder section 41 are produced by a deep-drawing process.

[0112] In particular, it can be provided that the return spring 11 is accommodated in the central recess 42.

[0113] In particular, it can be provided that a coil receptacle 24 is formed on the base 3, in which the coil core 17 and the coil 15 are received.

[0114] In particular, it can be provided that the coil core 17 is rigidly received in the base 3 and that an advancing ability of the two friction surfaces 19, 20 relative to one another can be achieved by a corresponding displacement of the friction element 21 and that an advancing ability of the two friction surfaces 35, 36 relative to one another can be achieved by a corresponding displacement of the second friction element 31.

[0115] This can be achieved, for example, by accommodating the friction element 21 so that it can move relative to the key support 10 in a direction of movement 26, and by accommodating the second friction element 31 so that it can also move relative to the key support 10 in the direction of movement 26. This can be achieved by a form-fitting mount with corresponding freedom of movement, as shown in Fig. 7. Corresponding retaining lugs can be provided to limit the mobility of the friction element 21 and the second friction element 31.

[0116] In a further embodiment variant, it can also be provided that the displacement of the friction element 21 and the second friction element 31 in the direction of movement 26 is achieved in that the friction element carrier 22 is designed to be flexible and the spring-elastic property of the friction element carrier 22 is used to enable the movement of the friction element 21 and the second friction element 31.

[0117] The functionality of the first embodiment of the input device will now be explained by comparing Figs. 5 and 6.

[0118] In the illustration in Fig. 5, the input element 4 is in its rest position 13. It can be held in this position by the spring force of the return spring 11. By the user pressing the actuating surface 7 of the button 8, the input element 4 can be pushed against the spring force of the return spring 11 toward its actuated position 12. This movement or position of the input element 4 can be detected by a detection means 27.

[0119] The first friction surface 19 and the second friction surface 20 can slide against each other, with the normal force between the two friction surfaces 19, 20 being very low or zero. The third friction surface 35 and the fourth friction surface 36 can slide against each other, with the normal force between the two friction surfaces 35, 36 being very low or zero.

[0120] When a certain position of the input element 4 is reached, the coil 15 can be energized. This creates a magnetic field. The magnetic field is represented by field lines 28 arranged around the coil 15. The field lines 28 run through the coil core 17 and the friction elements 21, 31.

[0121] The magnetic field increases the normal force between the first friction surface 19 and the second friction surface 20, or presses them together. Furthermore, the magnetic field increases the normal force between the third friction surface 35 and the fourth friction surface 36, or presses them together. This can increase the friction force, which in turn can increase the displacement resistance of the input element.

[0122] When current is applied to coil 15, the first friction surface 19 is pressed against the second friction surface 20 by displacement of the friction element 21. At the same time, the third friction surface 35 is pressed against the fourth friction surface 36 by displacement of the second friction element 31. The frictional forces occurring symmetrically with respect to the plane of symmetry 37 prevent tilting and thus jamming of the input element 4. - l -

[0123] In particular, it can be provided that the current supply intensity can be varied, whereby the displacement resistance of the input element can also be varied. Depending on the specified current supply modes, a wide variety of haptic feedback can be provided to the user. If the user now reduces their pressure on the actuating surface 7 and, at the same time, the friction force of the two friction surfaces 19, 20 and the two friction surfaces 35, 36, corresponding to the current supply to the coil 15, is lower than the spring force of the return spring 11, the return spring 11 urges the input element 4 into the rest position 13 following the movement of the user's finger.

[0124] Fig. 8 shows a fourth embodiment of the input device 1 in a highly schematic representation, wherein again the same reference numerals or component designations are used for the same parts as in the preceding Figs. 1 to 7. To avoid unnecessary repetition, reference is made to the detailed description in the preceding Figs. 1 to 7.

[0125] As can be seen from Fig. 8, the friction element 21 can be provided with a friction element insert 43, which is ferromagnetic and embedded in the friction element 21. The friction element insert 43 can extend over a limited area of ​​the friction element 21, wherein the second friction surface 20 can be arranged outside the friction element insert 43. The first friction surface 19 can accordingly be arranged outside the coil 15 or the coil core 17 or the outer shell 18 of the coil 15 and can be coupled to the base 3.

[0126] The individual components can be configured such that, when the coil 15 is energized, a minimal distance is formed between the friction element 43 and the individual components, in particular the coil core 17 or outer shell 18, and the friction occurs between the first friction surface 19 and the second friction surface 20. The first friction surface 19 and the second friction surface 20 do not have to be made of a ferromagnetic material, but can also be made of a plastic material or another material, for example.

[0127] The embodiment described in Fig. 8 can be implemented mutatis mutandis in all of the previously described embodiments, be it with only one friction element 21 or also with a second friction element 31. Fig. 9 shows a first embodiment of a keyboard 44 with a plurality of input devices 1. In particular, it can be provided that one or more of the input devices 1 are designed according to one of the above embodiments. Not separately shown is a vehicle or a work machine which has an input device 1 according to one of the above embodiments. The input device 1 can in this case be designed, for example, in the form of a separate button on a control panel or in the form of a button on a joystick or the like.

[0128] In a further embodiment not shown, it is also conceivable for the input device 1 to be designed, for example, as a slider. Such a slider can operate without a return spring, but rather remain in its position. Alternatively, it is also conceivable for such a slider to be positioned in a specific position, for example, a central position, by means of the return spring 11.

[0129] The embodiments show possible embodiments, whereby it should be noted at this point that the invention is not limited to the specifically illustrated embodiments thereof, but rather various combinations of the individual embodiments with each other are also possible and this possibility of variation lies within the skill of the person skilled in the art in this technical field due to the teaching of technical action by means of the objective invention.

[0130] The scope of protection is determined by the claims. However, the description and drawings must be used to interpret the claims. Individual features or combinations of features from the various embodiments shown and described may represent independent inventive solutions. The problem underlying these independent inventive solutions can be derived from the description.

[0131] All information on value ranges in this description is to be understood as including any and all sub-ranges thereof, e.g. the information 1 to 10 is to be understood as including all sub-ranges, starting from the lower limit of 1 and the upper limit of 10, ie all sub-ranges begin with a lower limit of 1 or greater and end with an upper limit of 10 or less, e.g. 1 to 1.7, or 3.2 to 8.1, or 5.5 to 10. For the sake of clarity, it should be pointed out that in order to improve understanding of the structure, some elements have been shown out of scale and / or enlarged and / or reduced.

[0132] Reference symbol list

[0133] Input device 32 second recess

[0134] Digital computer 33 first coil core part

[0135] Base 34 second coil core part

[0136] Input element 35 third friction surface

[0137] Displacement direction 36 fourth friction surface

[0138] Guide mount 37 symmetry plane

[0139] Actuating surface 38 first flange section

[0140] Key 39 first cylinder section

[0141] Cover surface 40 second flange section

[0142] Key carrier 41 second cylinder section

[0143] Return spring 42 central recess

[0144] Actuation position 43 Friction element insert

[0145] Rest position 44 keyboard

[0146] braking device

[0147] Sink

[0148] Winding axis

[0149] Coil core

[0150] Outer shell first friction surface second friction surface friction element

[0151] Friction element carrier

[0152] axial direction

[0153] Coil holder

[0154] Recess coil holder

[0155] Direction of movement

[0156] Recording tools

[0157] Field lines

[0158] Pretensioning device

[0159] Recess second friction element

Claims

Patent claims 1. Input device (1) for inputting control commands into a digital computer (2), the input device (1) comprising: - a base (3); - an input element (4) which is displaceable in a displacement direction (5) on the base (3), wherein the input element (4) has an actuating surface (7) for actuation by a user; - a braking device (14) for influencing a displacement resistance of the input element (4) to the base (3), characterized in that the braking device (14) comprises the following elements: - a coil (15) for generating a magnetic field, the coil (15) being wound around a winding axis (16); - a coil core (17); - a first friction surface (19) coupled to the base (3); - a second friction surface (20) which is coupled to the input element (4), wherein a contact force of the first friction surface (19) on the second friction surface (20) can be changed by means of the magnetic field generated by the coil (15), whereby the displacement resistance of the input element (4) can be influenced.

2. Input device (1) according to claim 1, characterized in that the input element (4) comprises a button (8), wherein the actuating surface (7) is arranged on a cover surface (9) of the button (8), wherein the second friction surface (20) extends at a right angle to the cover surface (9) of the button (8).

3. Input device (1) according to claim 1 or 2, characterized in that the second friction surface (20) is arranged on a friction element (21) which is formed from a ferromagnetic material and the first friction surface (19) is formed on the coil core (17).

4. Input device (1) according to claim 2 and 3, characterized in that the friction element (21) is rigidly mounted on the key (8) or on a key carrier (10).

5. Input device (1) according to claim 4, characterized in that the coil core (17) is displaceably mounted on the base in an axial direction (23) of a winding axis (16). (3) is included.

6. Input device (1) according to claim 2 and 3, characterized in that the friction element (21) is received on the key (8) or on the key carrier (10) so as to be displaceable in a direction of movement (26) relative to the key (8) or to a key carrier (10), wherein the direction of movement (26) is formed at a right angle to the second friction surface (20).

7. Input device (1) according to claim 6, characterized in that a recess (30) for positively displaceably receiving the friction element (21) is formed in the key (8) or in the key carrier (10).

8. Input device (1) according to one of claims 3 to 7, characterized in that the first friction surface (19) is formed on the coil core (17) and that the friction element (21) and the coil core (17) are positioned relative to one another in such a way that the friction element (21) is pressed against the coil core (17) in the energized state of the coil (15), the magnetic field being conducted through the coil core (17) and the friction element (21).

9. Input device (1) according to one of the preceding claims, characterized in that a third friction surface (35) is formed which is coupled to the base (3) and a fourth friction surface (36) is formed which is coupled to the input element (4), wherein by means of the magnetic field generated by the coil (15) a contact force of the third friction surface (35) on the fourth friction surface (36) can be changed, wherein the second friction surface (20) and the fourth friction surface (36) are formed symmetrically to a plane of symmetry (37) of the input element (4).

10. Input device (1) according to one of the preceding claims, characterized in that a return spring (11) is designed to return the input element (4) to an initial position, wherein the coil core (17) has a central recess (42) in the region of the winding axis (16), wherein the return spring (11) is received in the central recess (42).

11. Input device (1) according to one of the preceding claims, characterized in that the first friction surface (19) and / or the second friction surface (20) are arranged outside the effective range of the generated magnetic field.

12. Keyboard (44) with several input devices (1) for entering control commands into a digital computer (2), characterized in that at least one of the input devices (1) is designed according to one of claims 1 to 11.

13. Vehicle or work machine with at least one input device (1) for inputting control commands into a digital computer (2), characterized in that the at least one input device (1) is designed according to one of claims 1 to 11.

14. A method for operating an input device (1) according to one of claims 1 to 11, which is coupled to a digital computer (2) and serves to input control commands into the digital computer (2), comprising the method steps: - detecting a position of the input element (4) by means of a detecting means; - Energizing the coil (15) and thus generating a magnetic field if this is specified by the digital computer (2) and thereby changing the contact force of the first friction surface on the second friction surface (20), whereby the displacement resistance of the input element (4) is influenced.

15. The method according to claim 14, characterized in that when the coil (15) is energized, the contact force of the first friction surface against the second friction surface (20) is increased and thus the displacement resistance of the input element (4) is increased.

16. Method according to claim 14 or 15, characterized in that the energization of the coil (15) is predetermined by the digital computer (2) when the input element (4) is moved to a specific position by a user, which is detected by means of the detection means.

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