Pen tip pressure sensing structure and electronic pen

Abstract

The application provides a pen tip pressure sensing structure and an electronic pen, comprising a pen tip, a pen tip support, a pressure sensor and a pen body, wherein one end of the pen tip support is connected with the pen tip, and the other end is provided with a pressure head; the action surface of the pressure head towards the pressure sensor is a spherical surface, the spherical center of the spherical surface is an end surface which contacts a writing surface when the pen tip writes; the side of the pressure sensor away from the pressure head abuts against the pen body. The pen tip writing pressure is transmitted to the pressure sensor through the pressure head of the pen tip support, and since the action surface of the pressure head is a spherical surface and the spherical center is located on the end surface which contacts the writing surface when the pen tip writes, when the pen tip writes at a certain inclination angle with the writing surface, the pen tip rotates at a small angle around the spherical center located on the end surface, and the force direction transmitted by the pen tip support to the pressure sensor always maintains the axial direction of the pen body. In this way, the pressure loss in the pen tip writing pressure transmission process is effectively reduced, and the accuracy of the pressure sensor in detecting the pen tip writing pressure is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of electronic equipment, and particularly relates to a pen tip pressure sensing structure and an electronic pen. BACKGROUND

[0002] The existing electronic pen is usually used in cooperation with a touchpad, a tablet computer and the like, and can not only write characters like a handwriting board, but also can delineate images with distinct levels according to the size of force.

[0003] The pressure sensing structure of the existing electronic pen is usually composed of a pressure head connected with the tail of a pen tip and a pressure sensor arranged in the interior of a pen body and connected with the pressure head. When a user holds the electronic pen to write or click, the pen tip moves inward to drive the pressure head to press the pressure sensor, so that the pressure sensor generates corresponding electrical signals to the electronic device such as the touchpad, the tablet computer and the like.

[0004] However, the existing electronic pen has the following shortcomings: when the pen tip is inclined at a certain angle with a writing surface to write, there is a large pressure loss in the process of transferring the writing pressure to the pressure sensor, so that the writing pressure detected by the pressure sensor is not accurate enough. SUMMARY

[0005] The main purpose of the present application is to provide a pen tip pressure sensing structure and an electronic pen to reduce the pressure loss in the process of transferring the writing pressure and improve the pressure sensing detection accuracy of the electronic pen.

[0006] The technical scheme of the present application is as follows:

[0007] A pen tip pressure sensing structure, comprising a pen tip, a pen tip support, a pressure sensor and a pen body, the pen tip, the pen tip support and the pressure sensor are arranged in sequence along the axial direction of the pen body; the pen tip support and the pressure sensor are arranged in the interior of the pen body; one end of the pen tip support is connected with the pen tip, and the other end is provided with a pressure head; the acting surface of the pressure head facing the pressure sensor is a spherical surface, and the spherical center of the spherical surface is located at the end surface of the pen tip contacting the writing surface when writing; the side of the pressure sensor away from the pressure head abuts against the pen body.

[0008] Further, the pen tip pressure sensing structure further comprises a pre-press spring; the pre-press spring is arranged between the pen tip support and the pen body, and is used for providing a pre-tightening force in the axial direction of the pen body.

[0009] Further, the end of the pen tip support connected with the pen tip is provided with a first protruding part; the first protruding part is provided with a pen tip slot, and the pen tip is inserted into the pen tip slot; the pre-press spring is a cylindrical spring, and is sleeved on the first protruding part; one end of the pre-press spring abuts against the pen body, and the other end abuts against the pressure head.

[0010] Further, the pen tip pressure sensing structure further comprises a pressure transfer module arranged between the pressure sensor and the pressure head; one end of the pressure transfer module abuts against the pressure head, and the other end abuts against the pressure sensor.

[0011] Further, the pressure transmission module comprises a pressure support, a piston module, a collapse spring and a pressure block; the pressure support abuts against the pressure head; the pressure support is provided with a first groove; the piston module is provided with a second protruding part at one end thereof facing the pressure support, and the second protruding part is arranged in the first groove; the collapse spring is sleeved on the second protruding part; one end of the collapse spring abuts against the bottom of the first groove, and the other end thereof abuts against the piston module; the piston module is provided with a second groove at one end thereof facing the pressure sensor; one end of the pressure block is arranged in the second groove, and the other end thereof abuts against the pressure sensor.

[0012] Further, the pen body comprises a guide support; the guide support is internally hollow to form an internal space for accommodating the pen tip support and the pressure transmission module; the shape of the internal space is adapted to the pen tip support and the pressure transmission module, and the guide support guides the pen tip support and the pressure transmission module to move along the axial direction of the pen body.

[0013] Further, the pen tip and the first protruding part are in interference fit.

[0014] Further, the pressure block and the second groove are in interference fit.

[0015] The application further provides an electronic pen comprising the pen tip pressure sensing structure.

[0016] The application provides a pen tip pressure sensing structure and an electronic pen, which comprise a pen tip, a pen tip support, a pressure sensor and a pen body; the pen tip, the pen tip support and the pressure sensor are arranged in sequence along the axial direction of the pen body; the pen tip support and the pressure sensor are arranged in the internal space of the pen body; one end of the pen tip support is connected with the pen tip, and the other end thereof is provided with a pressure head; the surface of the pressure head facing the pressure sensor is a spherical surface, and the center of the spherical surface is an end surface of the pen tip contacting a writing surface when the pen tip is writing; the side of the pressure sensor away from the pressure head abuts against the pen body. The writing pressure of the pen tip is transmitted to the pressure sensor through the pressure head of the pen tip support; since the surface of the pressure head facing the pressure sensor is a spherical surface, and the center of the spherical surface is located on the end surface of the pen tip contacting the writing surface when the pen tip is writing, when the pen tip is writing at a certain angle of inclination, the pen tip rotates around the center of the spherical surface by a small angle, and the force direction transmitted by the pen tip support to the pressure sensor always maintains the axial direction of the pen body. In this way, the pressure loss in the process of transmitting the writing pressure of the pen tip is effectively reduced, and the accuracy of the pressure sensor in detecting the writing pressure of the pen tip is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic diagram of a pen tip pressure sensing structure according to an embodiment of the application;

[0018] Figure 2 FIG. 2 is a structural schematic diagram of a pen tip pressure sensing structure according to another embodiment of the application; Figure 1 FIG. 3 is a local enlarged view of the M area in FIG. 2.

[0019] The objectives, functional characteristics and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0020] It should be understood that the specific embodiments described herein merely exemplify the application and do not impose any limitation on the application.

[0021] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features referred to. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically defined and limited.

[0022] In the description of the present application, it should be noted that unless otherwise specifically defined and limited, the terms "mounting", "connecting", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, it can be directly connected, or indirectly connected through intermediate medium, it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] In the present application, unless otherwise specifically defined and limited, the "upper" or "lower" of the first feature to the second feature can include that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the "upper", "above" and "on" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The "under", "below" and "under" of the first feature to the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0024] Embodiment one:

[0025] Reference Figure 1A pen tip pressure sensing structure includes a pen tip 1, a pen tip holder 2, a pressure sensor 3, and a pen body 4. The pen tip 1, the pen tip holder 2, and the pressure sensor 3 are arranged in sequence along an axial direction of the pen body 4. The pen tip holder 2 and the pressure sensor 3 are arranged inside the pen body 4. The pen tip holder 2 is connected to the pen tip 1 at one end and is provided with a pressure head 22 at the other end. The pressure head 22 has a spherical surface facing the pressure sensor 3, and the center of the spherical surface is the end surface 1a of the pen tip 1 that contacts a writing surface when the pen tip 1 writes. The pressure sensor 3 is in abutment with the pen body 4 on the side opposite to the pressure head 22.

[0026] In the present embodiment, the pen tip writing pressure is transmitted to the pressure sensor 3 through the pressure head 22 of the pen tip holder 2. Since the pressure head 22 has a spherical surface facing the pressure sensor 3, and the center of the spherical surface is located on the end surface 1a of the pen tip 1 that contacts a writing surface when the pen tip 1 writes, when the pen tip 1 writes at a certain angle of inclination, the pen tip 1 rotates around the center of the spherical surface on the end surface 1a by a small angle, and the force direction transmitted by the pen tip holder 2 to the pressure sensor 3 always maintains the axial direction of the pen body 4. In this way, the pressure loss of the pen tip writing pressure in the transmission process is effectively reduced, and the accuracy of the pressure sensor 3 in detecting the pen tip writing pressure is improved.

[0027] The pen tip pressure sensing structure further includes a pre-compression spring 5. The pre-compression spring 5 is arranged between the pen tip holder 2 and the pen body 4, and is used to provide a pre-tightening force in the axial direction of the pen body 4.

[0028] Specifically, the end of the pen tip holder 2 connected to the pen tip 1 is provided with a first protruding part 21. The first protruding part 21 is provided with a pen tip groove 21a, and the pen tip 1 is inserted into the pen tip groove 21a. The pre-compression spring 5 is a cylindrical spring and is sleeved on the first protruding part 21. One end of the pre-compression spring 5 is in abutment with the pen body 4, and the other end is in abutment with the pressure head 22.

[0029] The pen tip pressure sensing structure further includes a pressure transmission module 6 arranged between the pressure sensor 3 and the pressure head 22. One end of the pressure transmission module 6 is in abutment with the pressure head 22, and the other end is in abutment with the pressure sensor 3.

[0030] In the embodiment, the pen tip support 2 does not directly contact the pressure sensor 3, and the writing pressure of the pen tip 1 is transmitted to the pressure transmission module 6 through the pen tip support 2, and then transmitted to the pressure sensor 3 through the pressure transmission module 6. Since the terminal customer has a high requirement on the electronic pen, the writing pressure is between 0-5g, and therefore, the size precision requirement of the internal components of the pressure sensing structure is very high, and any slight size change or thermal expansion and contraction of the pressure sensing structure caused by the change of the ambient temperature can cause poor pressure sensing test. The application splits the support for transmitting the writing pressure into the pen tip support 2 and the pressure transmission module 6, greatly reduces the size precision requirement of the pressure sensing structure on the single part, and improves the production qualification rate of the pen tip pressure sensing structure. At the same time, since the acting surface of the pressure head 22 is a spherical surface and the spherical center is located on the end surface 1a of the pen tip 1, the acting point of the pen tip support 2 on the pressure transmission module 6 is always maintained at the same point of the pressure transmission module 6, and the direction of the acting force is consistent with the axis direction of the pen body 4, which effectively prevents the pressure loss caused by the increased friction between the pressure transmission module 6 and the pen body 4 due to the uncentered acting force of the pen tip support 2.

[0031] In the embodiment, the pressure transmission module 6 includes a pressure support 61, a piston module 62, a collapse spring 64 and a pressure block 63; the pressure support 61 abuts against the pressure head 22; the pressure support 61 is provided with a first recess 61a; the piston module 62 is provided with a second protruding part 621 at one end thereof facing the pressure support 61, and the second protruding part 621 is arranged in the first recess 61a; the collapse spring 64 is sleeved on the second protruding part 621; one end of the collapse spring 64 abuts against the bottom of the first recess 61a, and the other end thereof abuts against the piston module 62; the piston module 62 is provided with a second recess 62a at one end thereof facing the pressure sensor 3; one end of the pressure block 63 is arranged in the second recess 62a, and the other end thereof abuts against the pressure sensor 3.

[0032] The pen tip writing pressure of the application is transmitted to the pressure support 61 through the pen tip support 2, then transmitted to the piston module 62 through the collapse spring 64, then transmitted to the pressure block 63 through the piston module 62, and finally transmitted to the pressure sensor 3 through the pressure block 63. The pressure block 63 is made of stainless steel, and the hardness thereof meets the requirement of the pressure sensor 3.

[0033] When the electronic pen provided with the pen tip pressure sensing mechanism falls or the pen tip is over-pressured, the collapse spring 64 is contracted to form an avoiding space and absorb part of the pen tip pressure, so that the pressure of the pressure block 63 abutting against the pressure sensor 3 will not exceed the limit pressure that the pressure sensor 3 can bear, thereby protecting the pressure sensor 3 from being damaged by over-pressing.

[0034] In the embodiment, the pen body 4 comprises a guide bracket 41; the guide bracket 41 is hollow inside to form an internal space for accommodating the pen tip bracket 2 and the pressure transmission module 6; the internal space is shaped to match the pen tip bracket 2 and the pressure transmission module 6, and guide the pen tip bracket 2 and the pressure transmission module 6 to move axially along the pen body 4.

[0035] Specifically, the internal space comprises a first cavity 41a, a second cavity 41b and a third cavity 41c; the first cavity 41a, the second cavity 41b and the third cavity 41c are all cylindrical cavities. The pre-press spring 5, the pressure head 22, the pressure bracket 61, the collapsing spring 64, the piston module 62 and the pressure block 63 are arranged in the third cavity 41c; one end of the pre-press spring 5 abuts against the guide bracket 41, and the other end abuts against the pressure head 22; the pen tip 1 is inserted into the pen tip groove 21a through the first cavity 41a; the first cavity 41a is shaped to match the pen tip 1; the second cavity 41b is shaped to match the first protruding part 21; the third cavity 41c is shaped to match the pre-press spring 5, the pressure head 22, the pressure bracket 61 and the piston module 62; the pressure sensor 3 is arranged at the outlet of the third cavity 41c.

[0036] By arranging the guide bracket 41, the pen tip 1, the pen tip bracket 2, the pre-press spring 5, the pressure bracket 61, the collapsing spring 64, the piston module 62 and the stainless steel pressure block 63 are guided to move axially inside the pen body 4, which reduces the excessive friction between the internal components of the pressure sensing structure and the pen body 4 due to positional deviation, and further reduces the pressure loss or even makes the pressure sensing structure unable to work normally.

[0037] In the embodiment, the pen tip pressure sensing structure further comprises a main board bracket 8; the main board bracket 8 is arranged inside the pen body 4 and fixedly connected with the pen body 4; the side of the pressure sensor 3 away from the pressure transmission module 6 abuts against the main board bracket 8.

[0038] The pressure sensor 3 is arranged on the main board bracket 8, and can be electrically connected with the control module through the main board bracket 8 to convert the detected writing pressure into an electrical signal and transmit the electrical signal to the control module.

[0039] The pen tip 1 and the first protruding part 21 are in interference fit, the assembly structure is simple, and the fixed effect is reliable, which improves the product quality of the pressure sensing structure.

[0040] The pressure block 63 and the second groove 62a of the piston module 62 are in interference fit, the assembly structure is simple, and the fixed effect is reliable, which further improves the product quality of the pressure sensing structure.

[0041] The application further provides an electronic pen comprising the above-mentioned nib pressure sensing structure. The electronic pen is further provided with a control module, a wireless transmission module and a switch module. The pressure sensor 3 of the nib pressure sensing structure is electrically connected with the control module, and converts the detected writing pressure into an electrical signal and transmits the electrical signal to the control module. The wireless transmission module and the switch module are both electrically connected with the control module. The control module transmits the processed signal to a terminal device such as a touch screen or a tablet computer through the wireless transmission module to simulate the writing force of the electronic pen. The electronic pen has the writing pressure sensing function, can realize handwriting input and handwriting recognition, can automatically adjust the thickness of handwriting according to the handwriting pressure, and can further outline a clear image.

[0042] The nib pressure sensing mechanism and the electronic pen provided by the application reduce the pressure loss generated in the process of transmitting the writing pressure of the nib to the pressure sensor 3 by setting the action surface of the pressure head 22 of the nib support 2 towards the pressure sensor 3 as a spherical surface and setting the spherical center of the spherical surface at the end surface 1a of the nib 1 in contact with the writing surface during writing, improve the accuracy of the pressure sensor 3 in detecting the writing pressure of the nib, and further improve the quality of the product using the nib pressure sensing mechanism.

[0043] The above-mentioned is only the preferred embodiment of the application, and does not limit the patent scope of the application. Any equivalent structure or equivalent flow transformation using the content of the specification and the drawings, or direct or indirect application in other related technical fields, is also included in the patent protection scope of the application.

Claims

1. A pen tip pressure sensing structure, characterized in that: The invention comprises a pen tip, a pen tip holder, a pressure sensor, and a pen body; the pen tip, the pen tip holder, and the pressure sensor are arranged in sequence along the axial direction of the pen body; the pen tip holder and the pressure sensor are both located inside the pen body; one end of the pen tip holder is connected to the pen tip, and the other end is provided with a pressure head; the surface of the pressure head facing the pressure sensor is a spherical surface, the center of the spherical surface is located at the end surface of the pen tip that contacts the writing surface when writing; the side of the pressure sensor facing away from the pressure head abuts against the pen body; A pressure transmission module is provided between the pressure sensor and the pressure head; one end of the pressure transmission module abuts against the pressure head, and the other end abuts against the pressure sensor; The pressure transmission module includes a pressure support, a piston module, a collapse spring and a pressure block; the pressure support abuts the pressure head; the pressure support is provided with a first groove; the piston module is provided with a second protrusion at one end facing the pressure support, and the second protrusion is arranged in the first groove; the collapse spring is sleeved on the second protrusion; one end of the collapse spring abuts the bottom of the first groove, and the other end abuts the piston module; the piston module is provided with a second groove at one end facing the pressure sensor; one end of the pressure block is arranged in the second groove, and the other end abuts the pressure sensor.

2. The pen tip pressure sensing structure according to claim 1, characterized in that: It also includes a pre-compression spring; the pre-compression spring is arranged between the pen tip support and the pen body, and is used to provide a pre-tightening force in the axial direction of the pen body.

3. The pen tip pressure sensing structure according to claim 2, characterized in that: A first protrusion is provided at one end of the pen tip holder connected to the pen tip; the first protrusion is provided with a pen tip groove, and the pen tip is inserted into the pen tip groove; the pre-stress spring is a cylindrical spring and is sleeved on the first protrusion; one end of the pre-stress spring abuts the pen body, and the other end abuts the pressure head.

4. The pen tip pressure sensing structure according to claim 1, characterized in that: The pen body includes a guide bracket; the guide bracket is hollow inside to form an internal space to accommodate the pen tip bracket and the pressure transmission module; the shape of the internal space is adapted to the pen tip bracket and the pressure transmission module, guiding the pen tip bracket and the pressure transmission module to move along the axial direction of the pen body.

5. The pen tip pressure sensing structure according to claim 3, characterized in that: The pen tip and the first protrusion are interference fit.

6. The pen tip pressure sensing structure according to claim 5, characterized in that: The pressing block and the second groove are in interference fit.

7. An electronic pen, characterized in that: The pen tip pressure sensing structure comprises the pen tip pressure sensing structure according to any one of claims 1 to 6.

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