Touch force sensing device and touch force sensing system

Abstract

The invention relates to a touch force sensing device and a touch force sensing system. The touch force sensing device comprises a base; the elastic piece is connected with the base, the elastic piece comprises a first elastic part and a second elastic part, and the second elastic part is located between the first elastic part and the base; the detection piece is located on the second elastic part, and the detection piece is used for detecting the deformation of the second elastic part; the feeler lever is connected with the first elastic part, and the diameter of the feeler lever is gradually increased from one end, far away from the first elastic part, of the feeler lever to the first elastic part. According to the touch force sensing device and the touch force sensing system, the force detection sensitivity of the touch force sensing device can be improved, and the direction detection range of the force can be enlarged.

Description

Technical Field

[0001] The present invention relates to the technical field of sensor devices, and in particular to a touch force sensor device and a touch force sensor system. Background Art

[0002] A touch force sensor is a commonly used electronic touch force sensor device, which is often used in the medical field, the mechanical field, and is also often used in simulation tests. Currently, the commonly used touch force sensor is usually composed of a disc-shaped contact piece and a sensing element. By pressing the contact piece, the sensing element sends a sensing signal to the outside. However, this touch force sensor can only detect force in a single direction, and cannot detect force in multiple directions, resulting in a small force direction detection range of the touch force sensor. Summary of the invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a touch force sensing device and a touch force sensing system, which can improve the force direction detection range of the touch force sensing device.

[0004] In order to solve the above technical problems, the present invention provides a touch force sensing device, comprising: a base; an elastic member connected to the base, the elastic member comprising a first elastic part and a second elastic part, the second elastic part being located between the first elastic part and the base; a detection member, the detection member being located on the second elastic part, the detection member being used to detect the deformation of the second elastic part; a touch rod, the touch rod being connected to the first elastic part, the diameter of the touch rod gradually increasing from an end of the touch rod away from the first elastic part toward the direction of the first elastic part.

[0005] In one embodiment of the present invention, the diameter of the first elastic portion gradually decreases from both ends to the middle position.

[0006] In one embodiment of the present invention, the ends of the first elastic part and the touch rod connected to each other have the same diameter, and the diameter of the end of the first elastic part connected to the touch rod is larger than the diameter of the end of the first elastic part connected to the second elastic part.

[0007] In one embodiment of the present invention, the end of the touch rod away from the first elastic part is a pointed end, the touch rod and the elastic member are both centrosymmetrical structures, and the centrosymmetrical axes of the touch rod and the elastic member are collinear.

[0008] In one embodiment of the present invention, a side wall of the second elastic portion is provided with a mounting groove, the detection member is connected to the mounting groove, and the detection member is in contact with the bottom of the mounting groove.

[0009] In one embodiment of the present invention, a plurality of mounting grooves are disposed on the side wall of the second elastic portion, and the plurality of mounting grooves are centrally symmetrical with the center line of the second elastic portion as an axis.

[0010] In one embodiment of the present invention, the depth of the mounting groove is greater than the thickness of the detection member, the elastic member further includes a stopper, the stopper is located at the open end of the mounting groove, and the detection member is located between the bottom of the mounting groove and the stopper.

[0011] In one embodiment of the present invention, the second elastic portion is further provided with a protrusion, the protrusion is located between the mounting groove and the base, the protrusion surrounds the side wall of the second elastic portion, and the side wall of the protrusion is arc-shaped.

[0012] The present invention also provides a touch force sensing system, comprising the touch force sensing device and a controller.

[0013] In one embodiment of the present invention, the detection element of the touch force sensing device is connected to the controller via a wire, the wire passes through one end connected to the base by the second elastic portion and penetrates the base, a guide groove is provided on a side of the base away from the second elastic portion, the wire is engaged with the guide groove and extends along the guide groove.

[0014] The above technical solution of the present invention has the following advantages compared with the prior art:

[0015] The touch force sensing device and touch force sensing system of the present invention, through the cooperation between the touch rod and the elastic member, after the touch rod is subjected to contact forces of different directions and magnitudes, the elastic member can produce deformations of different directions and magnitudes, and the detection of the deformation of the elastic member by the detection member can realize the detection of contact forces of different directions and magnitudes, thereby improving the force direction detection range of the touch force sensing device. By setting the touch rod in a right conical shape, when the touch rod is subjected to a force parallel to the end face of the touch rod, the detection member can also detect the contact force through the touch rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments of the present invention in conjunction with the accompanying drawings.

[0017] Figure 1 is a structural schematic diagram of a touch force sensing device of the present invention;

[0018] Figure 2 yes Figure 1 Schematic diagram of some structures;

[0019] Figure 3 It is a schematic diagram of the connection structure between the detection component and the wire.

[0020] Explanation of the reference numerals in the specification: 1. touch rod; 2. first elastic part; 3. second elastic part; 4. detection member; 5. base; 31. mounting groove; 32. protrusion; 41. wire. DETAILED DESCRIPTION

[0021] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0022] Embodiment 1

[0023] Reference Figure 1 and Figure 2 As shown, a touch force sensing device of the present invention comprises: a base 5; an elastic member connected to the base 5, the elastic member comprising a first elastic portion 2 and a second elastic portion 3, the second elastic portion 3 being located between the first elastic portion 2 and the base 5; a detection member 4, the detection member 4 being located on the second elastic portion 3, the detection member 4 being used to detect the deformation of the second elastic portion 3; a touch rod 1, the touch rod 1 being connected to the first elastic portion 2, the diameter of the touch rod 1 gradually increasing from an end of the touch rod 1 away from the first elastic portion 2 toward the first elastic portion 2.

[0024] In a touch force sensing device of this embodiment, since the touch rod 1 is connected to the first elastic part 2 of the elastic member, and the elastic member is made of a material with elastic deformation, after the contact force is applied to the touch rod 1, the contact force can drive the first elastic part 2 to deform, and the second elastic part 3 can also deform, and the detection member 4 can detect the deformation of the second elastic part 3 and generate a force signal, and the force signal is analyzed by an external controller to obtain the magnitude and direction of the force applied to the touch rod 1. Through the cooperation between the touch rod 1 and the elastic member, after the touch rod 1 is subjected to contact forces of different directions and magnitudes, the elastic member can generate deformations of different directions and magnitudes, and the detection member 4 detects the deformation of the elastic member, thereby realizing the detection of contact forces of different directions and magnitudes, thereby improving the force direction detection range of the touch force sensing device.

[0025] The base 5 is in the shape of a flat plate as a whole. In this embodiment, the cross section of the base is a quadrilateral with rounded corners. According to the external connection structure, the cross section of the base can also be set to be circular, elliptical, triangular, etc. Specifically, the base 5 is made of polydimethylsiloxane material.

[0026] The elastic member is connected to the base 5, and the elastic member includes a first elastic part 2 and a second elastic part 3, and the second elastic part 3 is located between the first elastic part 2 and the base 5. Specifically, the second elastic part 3 is connected to the middle position of the base 5, and the first elastic part 2 is connected to the end of the second elastic part 3 away from the base 5. The elastic member is made of a material with elastic deformation properties, and the material with elastic deformation properties can be polydimethylsiloxane, silicone, polylactic acid, etc., preferably polydimethylsiloxane, so that the elastic modulus of the elastic member is small and easy to bend under force. The integrated body of the first elastic part 2 and the second elastic part 3 is both columnar. Preferably, the first elastic part 2 and the second elastic part 3 are in an integrated structure, and the materials used by the first elastic part 2 and the second elastic part 3 are the same, so that the first elastic part 2 and the second elastic part 3 have the same force transmission, which is convenient for the detection member 4 to detect the deformation of the second elastic part 3. Preferably, the first elastic part 2 and the second elastic part 3 are both centrosymmetric structures, and the symmetry axes of the centrosymmetry of the first elastic part 2 and the second elastic part 3 are collinear, that is, the elastic member as a whole is a centrosymmetric structure.

[0027] Preferably, the diameter of the first elastic part 2 gradually decreases from both ends to the middle position, that is, the middle position of the side wall of the first elastic part 2 is an arc-shaped groove, so that the deformation degree of the first elastic part 2 is greater after the touch rod 1 is subjected to force, thereby improving the detection sensitivity of the detection member 4.

[0028] The detection member 4 is located on the second elastic part 3, and the detection member 4 is used to detect the deformation of the second elastic part 3. Specifically, the detection member 4 is fitted with the second elastic part 3, so that the detection member 4 can accurately detect the deformation of the second elastic part 3. The detection member 4 is in the shape of a plate, and the side wall of the second elastic part 3 is provided with a mounting groove 31. The detection member 4 is connected to the mounting groove 31, and the detection member 4 is fitted with the bottom of the mounting groove 31. Preferably, the side wall of the second elastic part 3 is provided with a plurality of mounting grooves 31, and the plurality of mounting grooves 31 are centrally symmetrically arranged with the center line of the second elastic part 3 as the axis, and the plurality of detection members 4 are respectively connected with the plurality of mounting grooves 31, so that the plurality of detection members 4 can detect the deformation of multiple positions on the second elastic part 3, thereby improving the accuracy of the detection and also improving the force direction detection range. Preferably, the depth of the mounting groove 31 is greater than the thickness of the detection member 4, and the elastic member further includes a stopper, which is located at the open end of the mounting groove 31, and the detection member 4 is located between the bottom of the mounting groove 31 and the stopper, and the stopper is made of the same material as the elastic member, and the stopper is engaged with the mounting groove 31, thereby preventing the detection member 4 from being separated from the mounting groove 31. In another embodiment, the stopper is formed by casting into the mounting groove 31, so that the stopper is fixedly connected to the mounting groove 31, and the detection member 4 is then covered in the stopper, and the detection member 4 detects the deformation of the second elastic part 3 more accurately. The second elastic part 3 is also provided with a protrusion 32, which is located on the side wall of the second elastic part 3, and the protrusion 32 is located between the mounting groove 31 and the base 5, and the protrusion 32 surrounds the side wall of the second elastic part 3, and the side wall of the protrusion 32 is in an arc shape protruding outward, and the provision of the protrusion 32 improves the overall strength of the elastic member.

[0029] The touch rod 1 is connected to the end of the first elastic part 2 away from the second elastic part 3, and the diameter of the touch rod 1 gradually increases from the end of the touch rod 1 away from the first elastic part 2 to the first elastic part 2. Specifically, the touch rod 1 can be made of rigid materials such as hard resin, acrylic, styrene, etc. Preferably, the touch rod 1 is made of hard resin material. The touch rod 1 uses a rigid material so that the force loss during the deformation of the first elastic part 2 driven by the touch rod 1 is small, thereby improving the detection accuracy of the contact force sensor device. The end of the touch rod 1 away from the first elastic part 2 is a tip, the touch rod 1 is a centrally symmetrical structure, and the axes of central symmetry of the touch rod 1 and the elastic member are colinear, so that the touch rod 1 is in the shape of a right circular cone as a whole. When a contact force is applied to the touch rod 1, if the direction of the contact force is parallel to the end face of the touch rod 1, since the side wall of the touch rod 1 is inclined, the detection member 4 can also detect the contact force through the touch rod 1. If the detection member 4 is cylindrical, when a contact force parallel to the end face of the feeler rod 1 is applied to the top of the detection member 4, the detection member 4 will vertically press the first elastic part 2 downward, causing the detection member 4 to be unable to identify the contact force. The ends of the first elastic part 2 and the feeler rod 1 connected to each other have the same diameter, and the diameter of the end of the first elastic part 2 connected to the feeler rod 1 is greater than the diameter of the end of the first elastic part 2 connected to the second elastic part 3.

[0030] When in use, a contact force is applied to the touch rod 1 through an external device, and the contact force causes the first elastic part 2 to deform, thereby causing the second elastic part 3 to also deform. The detection member 4 detects the deformation of the second elastic part 3 and generates a force signal. The force signal is analyzed by an external controller to obtain the size and direction of the force applied to the touch rod 1.

[0031] Embodiment 2

[0032] Reference Figure 3 As shown, this embodiment provides a touch force sensing system, including the touch force sensing device in the first embodiment, and also includes a controller. The detection member 4 of the touch force sensing device is connected to the controller through a wire 41. The wire 41 passes through the end where the second elastic part 3 is connected to the base 5 and penetrates the base 5, that is, the wire 41 passes through the end of the second elastic part 3 and the base 5 in sequence. A guide groove is provided on the side of the base 5 away from the second elastic part 3. The wire 41 is clamped with the guide groove and extends along the guide groove until the wire 41 is connected to the controller. The wire 41 can be made of a material with good electrical conductivity, such as a copper wire 41 or an aluminum wire 41.

[0033] Embodiment 3

[0034] This embodiment provides an assembly method of a touch force sensor system, which assembles the touch force sensor system in the second embodiment, including the following steps:

[0035] S1: Complete the processing of the touch rod 1, the elastic part and the base 5 by mold casting. S2: Connect the detection part 4 to the wire 41. S3: Place the detection part 4 in the mounting groove 31 of the second elastic part 3, and pass the wire 41 through the end of the second elastic part 3. S4: Pass the wire 41 through the base 5, and the wire 41 extends along the side of the base 5 away from the second elastic part 3 until the wire 41 is connected to the controller. S5: Connect the second elastic part 3 to the base 5. S6: Cast the mounting groove 31 of the second elastic part 3 to fix the detection part 4, and complete the sealing of the detection part 4 at the same time. The casting material is the same as the material of the elastic part. S7: Connect the touch rod 1 to the first elastic part 2.

[0036] A touch force sensing device and a touch force sensing system of the present invention, through the cooperation between the touch rod 1 and the elastic member, after the touch rod 1 is subjected to contact forces of different directions and magnitudes, the elastic member can produce deformations of different directions and magnitudes, and the detection of the deformation of the elastic member by the detection member 4 can realize the detection of contact forces of different directions and magnitudes, thereby improving the force direction detection range of the touch force sensing device. By setting the touch rod 1 in a right conical shape, when the touch rod 1 is subjected to a force parallel to the end face of the touch rod 1, the detection member 4 can also detect the contact force through the touch rod 1.

[0037] Obviously, the above embodiments are merely examples for clear explanation and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from these are still within the protection scope of the invention.

Claims

1. A touch force sensing device, characterized in that: include: Base; an elastic member connected to the base, the elastic member comprising a first elastic portion and a second elastic portion, the second elastic portion being located between the first elastic portion and the base; a detection member, the detection member being located on the second elastic portion and being used to detect deformation of the second elastic portion; A touch rod is connected to the first elastic part, and a diameter of the touch rod gradually increases from an end of the touch rod away from the first elastic part toward the first elastic part.

2. The touch force sensor device according to claim 1, characterized in that: The diameter of the first elastic portion gradually decreases from both ends to the middle position.

3. The touch force sensor device according to claim 1, characterized in that: The ends of the first elastic part and the touch rod connected to each other have the same diameter, and the diameter of the end of the first elastic part connected to the touch rod is larger than the diameter of the end of the first elastic part connected to the second elastic part.

4. The touch force sensor device according to claim 1, characterized in that: One end of the touch rod away from the first elastic part is a tip, the touch rod and the elastic member are both centrally symmetrical structures, and the centrally symmetrical axes of the touch rod and the elastic member are collinear.

5. The touch force sensor device according to claim 1, characterized in that: The side wall of the second elastic portion is provided with a mounting groove, the detection member is connected to the mounting groove, and the detection member is in contact with the bottom of the mounting groove.

6. The touch force sensor device according to claim 5, characterized in that: The side wall of the second elastic portion is provided with a plurality of mounting grooves, and the plurality of mounting grooves are centrally symmetrical with the center line of the second elastic portion as an axis.

7. The touch force sensor device according to claim 5, characterized in that: The depth of the mounting groove is greater than the thickness of the detection member, the elastic member further comprises a stopper, the stopper is located at the open end of the mounting groove, and the detection member is located between the bottom of the mounting groove and the stopper.

8. The touch force sensor device according to claim 5, characterized in that: The second elastic part is further provided with a protrusion, and the protrusion is located between the mounting groove and the base. The protrusion surrounds the side wall of the second elastic part, and the side wall of the protrusion is arc-shaped.

9. A touch force sensing system, comprising the touch force sensing device according to any one of claims 1 to 8, and further comprising a controller.

10. The touch force sensing system according to claim 9, characterized in that: The detection element of the touch force sensor device is connected to the controller through a wire, and the wire passes through the base from one end connected to the second elastic part. A guide groove is provided on the side of the base away from the second elastic part, and the wire is engaged with the guide groove and extends along the guide groove.

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