CN220455811U - Nib subassembly and electronic intelligent pen - Google Patents

Abstract

The utility model discloses a pen point assembly and an electronic intelligent pen, wherein the pen point assembly comprises a pen point and a pressure sensor, the pressure sensor comprises a mounting seat, the mounting seat comprises a detection part and a supporting part, the detection part is a cylinder, a convex part is arranged on a first end face of the detection part, the convex part is a cylinder, the convex part is abutted to the pen point, the supporting part is a circular ring, the supporting part is arranged on a second end face, the convex part, the supporting part and the central axis of the detection part coincide, a strain gauge is adhered to the second end face, and the strain gauge is used for detecting deformation of the detection part. When the user holds and rotates, the included angle between the plane of the first end surface and the pen point is still unchanged, and the convex part is positioned at the center of the mounting seat, so that the eccentric occurrence of uneven force application can be avoided, the pressure feeling of the user at each angle is the same, so that the inclination of the pen point caused by the direction change of the reaction force of the pen point is avoided, the isotropy of the detection of the pressure sensor is ensured, and the detection precision is improved.

Description

Nib subassembly and electronic intelligent pen

Technical Field

The utility model relates to the technical field of electronic equipment, in particular to a pen point assembly and an electronic intelligent pen.

Background

In order to facilitate the user's touch interaction, existing interactive smart devices (such as tablet or large-sized all-in-one machines) typically match electronic smart pens for writing or clicking operations. Along with the continuous improvement of the demands of users on writing experience, most of electronic intelligent pens can have an optimal design of handwriting thickness along with the difference of writing force of the users, the user can have different handwriting thicknesses in different force writing or line drawing states, a pen-tip effect is formed, and the user can feel more comfortable.

At present, various schemes for collecting the pressure of a user exist, and the current pressure value of the user is obtained by converting the force into deformation to cause the difference of electrical properties. The prior art has the following defects: the existing intelligent pen pressure sensor has variability in detection, lateral force generated by pressing at different angles causes positive and negative changes in detected force, the calculation difficulty of the rear end is increased, and the accuracy is reduced.

Disclosure of Invention

One object of an embodiment of the utility model is to: provided is a pen point assembly which can avoid interference of lateral force and has high detection precision.

Another object of an embodiment of the utility model is to: provided is an electronic smart pen having high sensitivity.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

in a first aspect, a nib assembly is provided, including nib and pressure sensor, pressure sensor includes the mount pad, the mount pad includes detection portion and supporting part, detection portion is the cylinder, detection portion includes first terminal surface and second terminal surface, first terminal surface protrusion is provided with the convex part, the convex part is the cylinder, the central axis of convex part with the central axis coincidence of detection portion, the convex part with nib butt, supporting part is the ring, supporting part sets up the second terminal surface, just the central axis of supporting part with the central axis coincidence of detection portion, the second terminal surface bonds there is the foil gage, the foil gage is used for detecting the deformation of detection portion.

As a preferred mode of the nib assembly, the detecting portion is provided with at least two weakening grooves, all the weakening grooves are annularly arranged around the central axis of the protruding portion, and the weakening grooves are spaced from the strain gauge positions.

As a preferred mode of the nib assembly, on the second end face, a patch area is formed between two adjacent weakening grooves at intervals, and the strain gauge is arranged in the patch area.

As a preferable mode of the nib assembly, the weakening groove is an arc hole, the arc length of the weakening groove extends along the circumferential direction of the protruding portion, and the arc center of the weakening groove coincides with the central axis of the protruding portion.

As a preferable mode of the nib assembly, a transitional cambered surface is arranged between the peripheral side surface of the convex part and the first end surface.

As a preferred scheme of nib subassembly, the nib includes nib body and body of rod, the one end of body of rod with nib body coupling, the other end of body of rod is provided with first contact surface, the terminal surface of convex part is the second contact surface, first contact surface with the butt of second contact surface, first contact surface with at least one of second contact surface is the sphere of evagination.

As a preferred mode of the nib assembly, the first contact surface is a convex spherical surface, and the second contact surface is a plane surface.

As a preferable mode of the nib assembly, the hardness of the supporting portion is greater than the hardness of the detecting portion.

As a preferable scheme of the pen point assembly, the thickness of the detecting part is L1, and L1 is 0.1mm-0.8mm; and/or the number of the groups of groups,

the thickness of the supporting part is L2, and L2 is more than or equal to L1+0.2mm.

The beneficial effects are that: through setting up mount pad and convex part into the cylinder, set up the supporting part into the ring, and set up the center coincidence of supporting part, convex part and mount pad three, at this moment, the central axis of convex part and mount pad is pressure sensor's central axis, pressure sensor is symmetrical about its own central axis, consequently, can guarantee that when the user grips and take place rotatory back, the contained angle between plane and the nib place first terminal surface is still unchangeable, and the convex part is located the central point of mount pad, can avoid the application of force uneven to take place decentered, the user is the same at the pressure impression of each angle, avoid nib reaction force direction change to arouse the nib crookedly, consequently, pressure sensor can detect the pressure of user along the nib direction in-process of writing, avoid the influence of slope rear side direction force, under the condition that nib and writing the plane have the contained angle, no matter how the nib is rotated to the user, pressure sensor's detection can isotropy, improve the precision of detection.

In a second aspect, an electronic smart pen is provided, including a housing and the nib assembly described above, a housing is provided with a housing cavity therein, a pressure sensor of the nib assembly is disposed in the housing cavity, and a nib of the nib assembly is slidably disposed in the housing cavity and the nib protrudes out of an opening of the housing cavity.

The beneficial effects are that: because the pressure sensor of nib subassembly is symmetrical about its self central axis, when the user holds and takes place rotatory back, the contained angle between plane and the nib that first terminal surface was located still is unchangeable to the convex part is located the central point of mount pad, can avoid the uneven eccentric emergence of application of force, and pressure sensor can detect the pressure along the nib direction of user's in-process of writing, and consequently the sensitivity of electronic intelligent pen is high.

Drawings

The utility model is described in further detail below with reference to the drawings and examples.

Fig. 1 is a schematic diagram of an electronic smart pen according to an embodiment of the present utility model.

Fig. 2 is a schematic diagram of a pressure sensor according to an embodiment of the present utility model.

FIG. 3 is a schematic cross-sectional view of a pressure sensor according to an embodiment of the present utility model.

FIG. 4 is a schematic cross-sectional view at A-A of FIG. 3.

In the figure:

1. a return spring; 2. a pressure sensor; 21. a mounting base; 211. a first end face; 212. a second end face; 213. a detection unit; 2131. a weakening groove; 214. a support part; 215. a transitional cambered surface; 216. chamfering; 22. a convex portion; 221. a second contact surface; 3. a pen point; 31. a nib body; 32. a rod body; 321. a first contact surface; 4. a housing; 41. a receiving chamber.

Detailed Description

In order to make the technical problems solved by the present utility model, the technical solutions adopted and the technical effects achieved more clear, the technical solutions of the embodiments of the present utility model will be described in further detail below with reference to the accompanying drawings, and it is obvious that the described embodiments are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to fall within the scope of the utility model.

In order to facilitate touch interaction for users, existing interactive smart devices (such as tablet or large-sized integrated machines) are usually matched with electronic smart pens for writing or clicking operations; along with the continuous promotion of user's demand to writing experience, most electronic intelligent pen can have the optimal design of carrying out the handwriting thickness along with user's writing dynamics difference for the user can have different handwriting thicknesses in different dynamics writing or drawing states ("the style" effect), and it is more comfortable to let user's perception.

At present, various schemes for collecting the pressure of a user exist, and the current pressure value of the user is obtained by converting the force into deformation to cause the difference of electrical properties. However, the existing intelligent pen pressure sensor is not of a central axis symmetrical structure, so that pen pressure has variability, lateral force generated by pressing at different angles causes positive and negative changes of detected force, calculation difficulty of the rear end is increased, and accuracy is reduced.

Based on this, this application proposes a nib subassembly, and this nib subassembly is through improving pressure sensor's structure to reach the detection that ensures pressure sensor and can isotropic, improve the technological effect of detection precision.

The structure of the nib assembly will be specifically described with reference to the embodiments.

As shown in fig. 1 to 3, the pen tip assembly provided by the utility model comprises a pen tip 3 and a pressure sensor 2, wherein the pressure sensor 2 comprises a mounting seat 21, the mounting seat 21 comprises a detection part 213 and a support part 214, the detection part 213 is cylindrical, the support part 214 is circular, the detection part 213 is provided with a first end surface 211 and a second end surface 212 which are oppositely arranged, the first end surface 211 of the detection part 213 is convexly provided with a convex part 22, the convex part 22 is cylindrical, the central axis of the convex part 22 coincides with the central axis of the mounting seat 21, the convex part 22 is abutted with the pen tip 3, the support part 214 is arranged on the second end surface 212 of the detection part 213, the central axis of the support part 214 coincides with the central axis of the detection part 213, and a strain gauge is adhered on the second end surface 212 and used for detecting the deformation of the detection part 213. The external pressure is applied to the detection part 213 through the convex part 22, so that the detection part 213 is subjected to bending deformation, and at this time, the strain gauge attached to the second end surface 212 of the detection part 213 judges the magnitude of the external pressure by detecting the deformation amount of the detection part 213, thereby realizing the change of handwriting; by arranging the detecting portion 213 and the protruding portion 22 as a cylinder and arranging the supporting portion 214 as a circular ring, and arranging the centers of the supporting portion 214, the protruding portion 22 and the detecting portion 213 to coincide, at this time, the central axes of the protruding portion 22 and the mounting seat 21 are the central axes of the pressure sensor 2, and the pressure sensor 2 is symmetrical about the central axes thereof, so that it can be ensured that after the user holds the pen, the angle between the plane where the detecting portion 213 is located and the pen point 3 is unchanged, and the protruding portion 22 is located at the central position of the detecting portion 213, so that the bias of the applied force is avoided, the pressure feeling of the user at each angle is the same, the inclination of the pen point 3 caused by the change of the reaction force direction of the pen point 3 is avoided, the influence of the side force after inclination is avoided, and under the condition that the pen point and the writing plane have the angle, the detection of the pressure sensor 2 can be isotropic regardless of the user rotation, and the detection precision is improved.

Referring to fig. 4, it is preferable that at least two weakening grooves 2131 are provided on the detecting portion 213, all the weakening grooves 2131 are annularly arranged around the central axis of the convex portion 22, and the weakening grooves 2131 are spaced apart from the strain gage position. The strength of the detecting portion 213 can be weakened by arranging the weakening groove 2131 in the detecting portion 213, so that the detecting portion 213 is easier to deform, namely, when external pressure is constant, the arrangement of the weakening groove 2131 can increase the deformation amount of the detecting portion 213, increase the deformation amplitude of the detecting portion 213 and reduce the detection difficulty of the strain gauge, so that the detection sensitivity of the pressure sensor 2 can be improved, and the detection accuracy of the pressure sensor can be improved; by providing all of the weakening grooves 2131 annularly arranged around the central axis of the convex portion 22, the symmetry of the pressure sensor 2 can be maintained, the provision of the weakening grooves 2131 is avoided to weaken the isotropy detection ability of the pressure sensor 2, and the detection accuracy of the pressure sensor 2 is ensured.

Further, on the second end face 212 of the detection portion 213, a patch region is formed between two adjacent weakening grooves 2131 at an interval, and strain gauges are provided in the patch region. It can be appreciated that the area between two adjacent weakening grooves 2131 has the weakest strength, and is most easily deformed when being pressed, and the strain gauge is arranged between two adjacent weakening grooves 2131, so that the detection difficulty of the strain gauge can be reduced, and the detection sensitivity of the pressure sensor 2 can be further improved.

In the present embodiment, illustratively, the weakening groove 2131 penetrates the detecting portion 213, at this time, the weakening groove 2131 corresponds to a hole structure, the weakening groove 2131 is an arc-shaped hole, the length of the weakening groove 2131 extends in the circumferential direction of the protruding portion 22, and the arc-shaped center of the weakening groove 2131 coincides with the central axis of the protruding portion 22. By providing the weakening groove 2131 as an arc-shaped hole, the length of the weakening groove 2131 can be increased, thereby increasing the opening range of the mount 21, weakening the strength of the detection portion 213 of the mount 21, and enabling the detection portion 213 to be deformed more easily; by arranging the length of the weakening groove 2131 to extend in the circumferential direction of the convex portion 22, and the arc-shaped center of the weakening groove 2131 coincides with the central axis of the convex portion 22, the distance between the weakening groove 2131 and the central axis of the mounting seat 21 can be made uniform, the symmetry of the pressure sensor 2 can be ensured as much as possible, and the isotropic detection capability and the detection accuracy of the pressure sensor 2 can be ensured. In other embodiments, the shape of the weakening grooves 2131 is not limited to an arc-shaped hole, and the weakening grooves 2131 may be holes of other shapes such as rectangular holes, triangular holes, and the like. In other embodiments, the weakening groove 2131 may not extend through the detection portion 213, for example, when the thickness of the detection portion 213 is 0.25mm, the weakening groove 2131 may be provided to a depth of 0.1 mm.

Optionally, a transitional cambered surface 215 is provided between the circumferential side surface of the convex portion 22 and the first end surface 211. In this embodiment, the protruding portion 22 and the mounting seat 21 are integrally formed, and the transitional cambered surface 215 is provided, so that the processing difficulty of the protruding portion 22 can be reduced, and the production cost of the pressure sensor 2 can be reduced.

It can be understood that the radius of the transitional cambered surface 215 can affect the detection accuracy of the pressure sensor 2, the larger the radius of the transitional cambered surface 215 is, the larger the connection area between the convex portion 22 and the mounting seat 21 is, and under the condition of a certain external pressure, the smaller the pressure applied to the detection portion 213 is, the smaller the deformation amplitude is generated, and at this time, the lower the detection sensitivity of the pressure sensor 2 is; conversely, the smaller the radius of the transition arc surface 215, the smaller the connection area between the convex portion 22 and the mount 21, and the larger the pressure applied to the detection portion 213 when the external pressure is constant, the larger the deformation amplitude generated, and the higher the detection sensitivity of the pressure sensor 2.

Referring to fig. 3, the thickness of the detecting portion 213 is optionally L1, i.e., the thickness of the detecting portion 213 is L1, L1 is 0.1mm to 0.8mm. It is understood that the thicker the detection portion 213 is, the lower the detection sensitivity of the pressure sensor 2 is, the thinner the detection portion 213 is, and the higher the detection sensitivity of the pressure sensor 2 is, however, the thinner the detection portion 213 may cause the reliability of the pressure sensor 2 to be lowered, and the thickness of the detection portion 213 may be limited to 0.1mm to 0.8mm, so that both the reliability and the sensitivity of the pressure sensor 2 may be achieved. Illustratively, the thickness (i.e., L1) of the sensing portion 213 may be 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, etc. in size.

Further, the hardness of the support portion 214 is greater than that of the detection portion 213. In this embodiment, the pressure sensor 2 is fixed to the external connector through the supporting portion 214, and in use, the pressure sensor 2 recognizes the pressure by detecting the deformation of the detecting portion 213, and the hardness of the supporting portion 214 is set to be greater than that of the detecting portion 213, so that the deformation of the supporting portion 214 when the pressure is applied can be avoided, and thus the displacement of the detecting portion 213 due to the deformation of the supporting portion 214 during the detection can be avoided from affecting the detection accuracy.

Further, in the present embodiment, the supporting portion 214 is annular, the thickness of the supporting portion 214 is L2, that is, the distance between the inner ring side wall and the outer ring side wall of the supporting portion 214 is L2, and l2+—l1+0.2mm. It will be appreciated that the thickness of the support 214 affects the stability of the pressure sensor 2, providing L2+.L1+0.2mm, the strength of the support portion 214 can be increased so as to increase the wall thickness of the support portion 214, and the detection operation of the pressure sensor 2 can be stabilized. Illustratively, L2 may be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, 1.1mm, 1.2mm, 1.5mm, etc. in size.

Further, the nib 3 includes a nib body 31 and a rod body 32, one end of the rod body 32 is connected with the nib body 31, the other end of the rod body 32 is provided with a first contact surface 321, the end surface of the protrusion 22 is a second contact surface 221, the first contact surface 321 is abutted to the second contact surface 221, and at least one of the first contact surface 321 and the second contact surface 221 is a convex spherical surface. By arranging at least one of the first contact surface 321 and the second contact surface 221 to be convex spherical surfaces, the contact area between the pen point 3 and the pressure sensor 2 can be reduced, the spherical surface contact can effectively avoid the component force applied to the pen point 3 in the direction perpendicular to the pen point 3 when a user tilts the pen for writing or drawing a line, only the force along the direction of the pen point 3 is transmitted to the pressure sensor 2, and the stress changes caused by different holding angles and axial rotation of the pen in the holding state of the user can be effectively avoided; through setting up first contact surface 321 and second contact surface 221 butt, when nib 3 pressurized, pressure sensor 2 can detect the dynamics size that nib 3 pressurized immediately, promotes sensitivity.

In one embodiment, the nib body 31 and the rod body 32 are integrally formed, and in another embodiment, the nib body 31 and the rod body 32 are two independent parts, which are respectively assembled in the accommodating cavity 41 of the electronic intelligent pen housing 4.

In this embodiment, only one convex spherical surface is disposed on both the first contact surface 321 and the second contact surface 221, and the other is a plane, so that the processing cost can be reduced; in this embodiment, the rod 32 is a plastic member, and the mounting base 21 and the protruding portion 22 are made of a material with a low young's modulus, alternatively, the first contact surface 321 may be a convex spherical surface, and the second contact surface 221 may be a flat surface, so that the processing difficulty of the pressure sensor 2 may be further reduced. Of course, in other embodiments, the first contact surface 321 may be a plane, the second contact surface 221 may be a sphere, or both the first contact surface 321 and the second contact surface 221 may be a sphere.

In this embodiment, the protruding portion 22 and the mounting seat 21 are integrally formed, and the protruding portion 22 and the mounting seat 21 are made of a material (such as titanium alloy) with a low young's modulus, so that the deformation of the detecting portion 213 caused by the external pressure with the same magnitude is larger, thereby improving the sensitivity of the pressure sensor 2.

Further, a chamfer 216 is further provided between the first end surface 211 of the mounting seat 21 and the peripheral side surface of the mounting seat 21, so that burrs generated by the processing technology can be removed conveniently, and the appearance of the pressure sensor 2 is improved.

In the present embodiment, the peripheral side surface of the detecting portion 213 is flush with the outer ring side surface of the supporting portion 214, so that the processing difficulty of the mounting seat 21 can be reduced.

The strain gauge of the scheme is a resistance bridge strain gauge consisting of a resistance wire strain gauge or coated silver paste, for example, by collecting structural deformation to cause the electrical change of the strain gauge.

Referring to fig. 1, this embodiment further provides an electronic smart pen, including a housing 4 and a nib assembly in any of the above embodiments, a housing cavity 41 is provided in the housing 4, a pressure sensor 2 of the nib assembly is provided in the housing cavity 41, a nib 3 of the nib assembly is slidably provided in the housing cavity 41 and the nib 3 protrudes out of an opening of the housing cavity 41. Because the pressure sensor 2 of the nib assembly is symmetrical about the central axis of the nib assembly, after the nib assembly is held by a user and rotated, the included angle between the plane of the detection portion 213 and the nib 3 is still unchanged, and the convex portion 22 is positioned at the central position of the detection portion 213, so that uneven force application and eccentricity can be avoided, and the pressure sensor 2 can detect the pressure along the direction of the nib during writing of the user, so that the sensitivity of an electronic intelligent pen comprising the nib assembly is high; the interactive screen matched with the electronic intelligent pen can control the thickness of the writing handwriting according to the acquired writing pressure, and the writing experience of a user is improved.

In this embodiment, the supporting portion 214 of the pressure sensor 2 may be fixed in the accommodating cavity 41 of the housing 4, the accommodating cavity 41 of the housing 4 is further provided with a return spring 1, the return spring 1 is sleeved on the outer periphery of the rod body 32 of the nib assembly, when the electronic smart pen is used for writing, under the action of writing pressure, the nib 3 moves towards one side of the pressure sensor 2 to press the protrusion 22 of the pressure sensor 2 and deform the detecting portion 213 thereof, and during the writing pause, the return elasticity may drive the nib 3 to move towards one side away from the pressure sensor 2, so that the nib 3 resets, thereby avoiding the nib 3 from continuously pressing the pressure sensor 2.

In this embodiment, in the initial state, the first contact surface 321 of the nib 3 abuts against the second contact surface 221 of the pressure sensor 2, when the nib 3 is pressed, the pressure sensor 2 can instantly detect the force of the nib 3 pressed, the electronic intelligent pen can detect that the nib contacts the screen and then responds to the touch operation, handwriting is avoided when the nib is not contacted with the screen, and zero writing height is achieved; and the electronic intelligent pen can also determine to start a right-click interaction mode similar to a mouse on the interaction screen by detecting the time of the pressed nib 3, so that the convenience of operation is improved.

Claims (10)

1. The utility model provides a nib subassembly, includes nib and pressure sensor, its characterized in that, pressure sensor includes the mount pad, the mount pad includes detection portion and supporting part, detection portion is the cylinder, detection portion includes first terminal surface and second terminal surface, first terminal surface protrusion is provided with the convex part, the convex part is the cylinder, the central axis of convex part with the central axis coincidence of detection portion, the convex part with nib butt, supporting part is the ring, supporting part sets up the second terminal surface, just the central axis of supporting part with the central axis coincidence of detection portion, the second terminal surface bonds there is the foil gage, the foil gage is used for detecting the deformation of detection portion.

2. A nib assembly according to claim 1, wherein the detection portion is provided with at least two weakening grooves, all of which are annularly arranged around the central axis of the protrusion, the weakening grooves being spaced from the strain gauge positions.

3. A nib assembly according to claim 2, wherein on the second end face, a patch area is formed between adjacent ones of the weakening grooves, the strain gauge being disposed in the patch area.

4. The nib assembly of claim 2, wherein the weakening groove is an arcuate hole, an arcuate length of the weakening groove extends in a circumferential direction of the protrusion, and an arcuate center of the weakening groove coincides with a central axis of the protrusion.

5. The nib assembly of claim 1, wherein a transitional arcuate surface is provided between the peripheral side surface of the protrusion and the first end surface.

6. The nib assembly according to claim 1, wherein the nib comprises a nib body and a rod body, one end of the rod body is connected with the nib body, a first contact surface is arranged at the other end of the rod body, the end surface of the protruding portion is a second contact surface, the first contact surface and the second contact surface are abutted, and at least one of the first contact surface and the second contact surface is a convex spherical surface.

7. The nib assembly of claim 6 wherein the first contact surface is a convex spherical surface and the second contact surface is a planar surface.

8. The nib assembly of any of claims 1-7, wherein the hardness of the support portion is greater than the hardness of the detection portion.

9. A nib assembly according to any of claims 1 to 7, wherein the thickness of the detection portion is L1, L1 being 0.1mm to 0.8mm; and/or the number of the groups of groups,

the thickness of the supporting part is L2, and L2 is more than or equal to L1+0.2mm.

10. An electronic intelligent pen, comprising a housing, wherein a containing cavity is arranged in the housing, and the electronic intelligent pen is characterized by further comprising a pen point assembly according to any one of claims 1-9, wherein a pressure sensor of the pen point assembly is arranged in the containing cavity, and a pen point of the pen point assembly is arranged in the containing cavity in a sliding manner and protrudes out of an opening of the containing cavity.