Writing device

Abstract

The present application discloses a writing device, belonging to the technical field of touch devices. The writing device includes a touch pen tip and an electromagnetic coil. The touch pen tip includes a flexible outer shell filled with magnetorheological material. A first cavity is provided inside the flexible outer shell, and the magnetorheological material filling is arranged in the first cavity, and the magnetorheological material filling supports the flexible outer shell; the electromagnetic coil is arranged at one end of the flexible outer shell. When the electromagnetic coil is powered on, at least part of the magnetorheological material filling is located in the magnetic field generated by the electromagnetic coil, and the hardness of the magnetorheological material filling can be adjusted. This solution can solve the problem that the writing device needs to change the inclination angle during writing to adjust the thickness of the writing stroke, resulting in a poor writing feel for the user.

Description

Technical Field

[0001] This application belongs to the technical field of touch devices, and particularly relates to a writing device. Background Art

[0002] With the development of information technology, electronic devices of portable mobile devices are closely related to people's lives. Portable mobile devices can receive user input and perform functions expected by users based on this input. As a common input device, the stylus is widely used because of its small size, light weight, and easy operation.

[0003] Although current styli can adjust the thickness of writing strokes through software configuration or according to the tilt angle of the stylus during writing, neither software configuration nor changing the tilt angle of the stylus during writing can bring a real writing feel to users. Summary of the Invention

[0004] The purpose of the embodiments of this application is to provide a stylus that can solve the problem that the writing device needs to change the tilt angle during writing to adjust the thickness of writing strokes, resulting in a poor writing feel for users.

[0005] To solve the above technical problems, this application is implemented as follows:

[0006] A writing device includes a touch pen tip and an electromagnetic coil. The touch pen tip includes a flexible shell filled with magnetorheological material.

[0007] A first cavity is provided inside the flexible shell.

[0008] The magnetorheological material filling is arranged in the first cavity, and the magnetorheological material filling supports the flexible shell.

[0009] The electromagnetic coil is arranged at one end of the flexible shell, and at least part of the magnetorheological material filling is located in the magnetic field generated by the electromagnetic coil.

[0010] The technical solution adopted by the present invention can achieve the following beneficial effects:

[0011] The writing device disclosed in the embodiment of the present invention adjusts the thickness of the writing stroke by changing the hardness of the touch pen tip, thereby making the writing device have a more real writing feel when writing. Specifically, when the writing force is constant, the smaller the hardness of the touch pen tip, the greater the deformation of the touch pen tip, and the thicker the writing stroke of the touch pen tip; the greater the hardness of the touch pen tip, the smaller the deformation of the touch pen tip, and the thinner the writing stroke of the touch pen tip. Specifically, the writing device adjusts the hardness of the touch pen tip by setting magnetorheological material filling in the first cavity of the flexible housing and controlling the damping size adjustment of the magnetorheological material filling through an electromagnetic coil. When the intensity of the magnetic field generated by the electromagnetic coil is greater, the damping of the magnetorheological material filling increases, and thus the hardness of the touch pen tip increases. When the intensity of the magnetic field generated by the electromagnetic coil decreases, the damping of the magnetorheological material filling decreases, and thus the hardness of the touch pen tip decreases. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 is a schematic diagram of a writing device disclosed in an embodiment of the present invention;

[0013] Figure 2 is a schematic diagram of the magnetorheological material filling in the case where the electromagnetic coil does not generate a magnetic field disclosed in an embodiment of the present invention;

[0014] Figure 3 is a schematic diagram of the magnetorheological material filling in the case where the electromagnetic coil generates a magnetic field disclosed in an embodiment of the present invention;

[0015] Figure 4 is a schematic diagram of a touch pen tip with a strain sensing element disclosed in an embodiment of the present invention;

[0016] Figure 5 is a schematic diagram of the writing device in the case where the electromagnetic coil generates a magnetic field disclosed in an embodiment of the present invention;

[0017] Figure 6 is a schematic diagram of the writing device in the case where the electromagnetic coil does not generate a magnetic field disclosed in an embodiment of the present invention;

[0018] Figure 7 is a schematic diagram of a touch pen tip including a plurality of electromagnetic coils disclosed in an embodiment of the present invention;

[0019] Figure 8 is a schematic diagram of the thick writing stroke and the thick and thin writing strokes of the writing device disclosed in an embodiment of the present invention;

[0020] Figure 9 is a schematic diagram of the vibration of the touch pen tip disclosed in an embodiment of the present invention;

[0021] In the figure:

[0022] 100 - touch pen tip;

[0023] 110 - Flexible housing;

[0024] 120 - Magnetostrictive material filling;

[0025] 200 - Strain sensor;

[0026] 300 - Touch display device;

[0027] 400 - Pen shaft;

[0028] 500 - Electromagnetic coil. Detailed implementation manners

[0029] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0030] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are usually of the same type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means an "or" relationship between the associated objects before and after.

[0031] Next, the writing device provided by the embodiments of the present application will be described in detail in conjunction with the accompanying drawings, through specific embodiments and their application scenarios.

[0032] Referring to Figures 1 to 8 , the writing device disclosed in the embodiments of the present invention includes a touch pen tip 100 and an electromagnetic coil 500.

[0033] The touch pen tip 100 includes a flexible housing 110 and a magnetostrictive material filling 120. A first cavity is provided inside the flexible housing 110, the magnetostrictive material filling 120 is disposed in the first cavity, and the magnetostrictive material filling 120 supports the flexible housing 110. The electromagnetic coil 500 is disposed at one end of the flexible housing 110. When the electromagnetic coil is energized, at least part of the magnetostrictive material filling 120 is located in the magnetic field generated by the electromagnetic coil 500, and the hardness of the magnetostrictive material filling can be adjusted.

[0034] The flexible outer shell 110 is made of a flexible material. There are many types of flexible materials, such as rubber, soft gum, etc. The present application does not limit the specific material of the flexible outer shell 110. The magnetorheological material filling 120 is made of a material whose fluidity can be adjusted by an externally applied magnetic field. Specifically, the magnetorheological material filling 120 can be made of a magnetorheological fluid. The fluidity of the magnetorheological fluid will decrease as the magnetic field strength increases under the action of the magnetic field, that is, the damping of the magnetorheological material filling 120 will increase as the magnetic field strength generated by the electromagnetic coil 500 increases. The present application does not limit the specific material of the magnetorheological material filling 120.

[0035] During the writing process, the touch pen tip 100 can use the bending angle of the pen tip of the touch pen tip 100 to simulate the adjustment of the tilt angle during writing, so as to realize the adjustment of the thickness of the writing trace of the touch pen tip 100. Specifically, when the writing force is constant, the greater the hardness of the touch pen tip 100, the smaller the bending angle of the touch pen tip 100, and thus the larger the angle between the section of the touch pen tip 100 close to the touch display device 300 and the touch display device 300. When the writing force is constant, the smaller the hardness of the touch pen tip 100, the larger the bending angle of the touch pen tip 100, and thus the smaller the angle between the section of the touch pen tip 100 close to the touch display device 300 and the touch display device 300. Therefore, the adjustment of the tilt angle during writing can be simulated by adjusting the hardness of the touch pen tip 100, so that the adjustment of the thickness of the writing trace can be realized without adjusting the angle between the writing device and the touch display device 300 during writing, and thus the writing device has a more real writing feel during writing.

[0036] In addition, during the writing process, the touch pen tip 100 can also realize the adjustment of the thickness of the writing trace according to the contact area between the touch pen tip 100 and the touch display device 300. Specifically, when the writing force is constant, the smaller the hardness of the touch pen tip 100, the greater the deformation of the touch pen tip, resulting in an increase in the contact area between the touch pen tip 100 and the touch display device 300, and thus the thicker the writing trace of the touch pen tip 100. The greater the hardness of the touch pen tip 100, the smaller the deformation of the touch pen tip 100 when the writing force is constant, and the smaller the contact area between the touch pen tip 100 and the touch display device 300, and thus the thinner the writing trace of the touch pen tip 100.

[0037] The writing device disclosed in the embodiments of the present invention can also simulate the writing feel of pen tips with different hardnesses. For example, when it is necessary to simulate the writing of a brush pen, the current passing through the electromagnetic coil 500 can be reduced, the intensity of the magnetic field generated by the electromagnetic coil 500 is decreased, the damping of the magnetorheological material filling 120 is reduced, and thus the overall hardness of the touch pen tip 100 becomes smaller, and then the hardness required for simulating the writing of a brush pen can be achieved. Another example is that when it is necessary to simulate the writing of a hard pen, the current passing through the electromagnetic coil 500 can be increased, the intensity of the magnetic field generated by the electromagnetic coil 500 is increased, the damping of the magnetorheological material filling 120 is increased, and thus the overall hardness of the touch pen tip 100 is increased, and then the hardness required for simulating the writing of a hard pen can be achieved. In addition, in the present application, the magnetorheological material filling 120 is filled into the first cavity. Then, without the action of a magnetic field, the damping values at various parts of the touch pen tip 100 are uniform. Furthermore, the continuous change of the hardness of the touch pen tip 100 can be realized by adjusting the continuity of the current passing through the electromagnetic coil 500, making the hardness adjustment of the touch pen tip 100 more delicate and capable of adapting to more requirements for the writing hardness of the pen tip. And because the damping values of the fillers in the first cavity are uniform, or the hardness changes uniformly under the action of a magnetic field, the touch pen tip 100 is smoother during the deformation process.

[0038] Referring to Figure 9 , in the above solution, an alternating voltage can also be applied to the electromagnetic coil 500, so that the magnetic field generated by the electromagnetic coil 500 can act on the magnetorheological material filling 120 in the first cavity, causing the magnetorheological material filling 120 to produce a vibration effect, thereby driving the touch pen tip 100 to vibrate, further enriching the application scenarios of the writing device. For example, in a game scenario, the user can be given a vibration feedback effect through the vibration of the touch pen tip 100, improving the user experience.

[0039] The writing device may further include a pen barrel 400, and the pen barrel 400 is connected to one end of the touch pen tip 100 away from the writing end. The pen barrel 400 serves as a basic component for the user to hold. Specifically, the pen barrel 400 can be a telescopic structure, and the length of the pen barrel 400 can be adjusted by extending or shortening the pen barrel 400, which is convenient for the user to carry and store. Further, the electromagnetic coil 500 can be disposed at one end of the pen barrel 400 connected to the touch pen tip 100.

[0040] Referring to Figure 4 and Figure 7, the electromagnetic coil 500 can be disposed at one end of the flexible housing 110 away from the writing end, so as to ensure that the hardness of the end of the touch pen tip 100 away from the writing end is greater than that of the writing end. According to the distribution of the magnetic field generated by the electromagnetic coil 500, the farther away from the electromagnetic coil 500, the weaker the magnetic field intensity. The electromagnetic coil 500 is disposed at one end of the flexible housing 110 away from the writing end, so that the hardness of the touch pen tip 100 decreases from the end away from the writing end to the writing end assembly, thereby improving the feel brought to the user when the touch pen tip 100 writes and enhancing the writing comfort of the product.

[0041] In an alternative embodiment, the number of the electromagnetic coils 500 is multiple, and the multiple electromagnetic coils 500 are disposed on the flexible housing 110, and the multiple electromagnetic coils 500 are disposed at different positions on the flexible housing 110 to respectively adjust the hardness of different positions of the touch pen tip 100 through the multiple electromagnetic coils 500. Specifically, the electromagnetic coil 500 can be sleeved on the flexible housing 110, and the hardness of different segments of the touch pen tip 100 can be adjusted by adjusting the magnitude of the current passing through each electromagnetic coil 500. Of course, it can also be circumferentially distributed on the touch pen tip 100 in different directions, and the hardness of different sides of the touch pen tip 100 can be adjusted by adjusting the magnitude of the current passing through each electromagnetic coil 500.

[0042] Referring to Figure 7 , the number of the electromagnetic coils 500 is multiple, and the multiple electromagnetic coils 500 are arranged in an array on one end of the flexible housing 110. Specifically, according to the hardness requirements of different regions of the touch pen tip 100, the magnitude of the current of the electromagnetic coil 500 corresponding to each region can be adjusted, so as to specifically adjust the hardness of different regions of the touch pen tip 100, so that the hardness values of different regions of the touch pen tip 100 are different, thereby simulating different nib effects.

[0043] Referring to Figure 1 , the touch pen tip 100 may further include a driving circuit, the driving circuit is connected to the electromagnetic coil 500, and the driving circuit adjusts the intensity of the magnetic field generated by each electromagnetic coil 500. Specifically, the intensity of the magnetic field generated by each electromagnetic coil 500 is adjusted by controlling the magnitude of the current passing through each electromagnetic coil 500 by the driving circuit. There are many methods for adjusting the magnitude of the current in the circuit. For example, the magnitude of the current of each circuit can be controlled by a controller, and the current of each circuit can also be controlled by a variable resistor. The present invention does not limit the specific manner in which the driving circuit adjusts the magnitude of the current passing through each electromagnetic coil 500.

[0044] Referring to Figures 4 to 8, the writing device may further include a strain sensor 200 disposed on the touch pen tip 100, and the strain sensor 200 can be deformed along with the touch pen tip 100. The strain sensor 200 is disposed on the touch pen tip 100, so that the strain sensor 200 can sense the amount of deformation of the touch pen tip 100 and determine the thickness of the user's writing stroke according to the amount of deformation of the touch pen tip 100. In this technical solution, the adjustment of the writing stroke of the touch pen tip is directly realized by detecting the amount of deformation of the touch pen tip 100, which can improve the fineness and accuracy of the adjustment of the thickness of the writing stroke of the touch pen tip 100.

[0045] Generally, during the writing process, in order to obtain a thicker writing stroke, it is necessary to increase the writing force. That is, when writing with a writing pen usually, the greater the writing force, the thicker the writing stroke, and the smaller the writing force, the thinner the writing stroke. In the above solution, the strain sensor 200 is used to sense the amount of deformation of the touch pen tip 100, and the writing force can be determined according to the amount of deformation of the touch pen tip 100, and then the thickness of the writing stroke expected by the user during writing can be determined, so as to realize the adjustment of the thickness of the user's writing stroke. It should be noted that since this solution realizes the adjustment of the thickness of the writing stroke according to the magnitude of the writing force during writing, the user can control the thickness of different positions in each stroke according to the usual writing habit by controlling the writing force.

[0046] In addition, when simulating hard pen writing, the strain sensor 200 can sense the current deformation state of the touch pen tip 100 to provide a basis for the shape adjustment of the touch pen tip 100. When the strain sensor 200 senses that the touch pen tip 100 is bent, the shape of the touch pen tip 100 can be adjusted by increasing the current passing through the electromagnetic coil 500. Specifically, increasing the current passing through the electromagnetic coil 500 can not only increase the damping strength of the magnetostrictive material filling 120, but also increase the squeezing force of the magnetostrictive material filling 120 and the flexible housing 110 in the magnetic field direction, so that the touch pen tip 100 returns to the vertical state. Of course, the touch pen tip 100 can also return to the vertical state under the elastic force of the flexible housing 110 to recover the deformation by turning off the electromagnetic coil 500 or reducing the current passing through the electromagnetic coil 500, so that the damping of the magnetostrictive material filling 120 is smaller.

[0047] Refer to Figure 7, the flexible housing 110 is conical, and the strain sensor 200 is disposed along the generatrix direction of the flexible housing 110 on the flexible housing 110. During the writing process, the touch pen tip 100 is mainly subjected to pressure and friction. Then, under the combined action of pressure and friction, the flexible housing 110 is mainly bent and deformed. As a result, the bending stress generated on the inner and outer sides of the bent part of the touch pen tip 100 is relatively large, that is, the deformation amounts on the inner and outer sides of the bent part of the touch pen tip 100 are relatively large. Therefore, the strain sensor 200 is disposed along the generatrix direction, which can improve the sensitivity of the strain sensor 200.

[0048] Refer to Figures 4 to 7 , the number of the strain sensors 200 is at least two, and the at least two strain sensors 200 are evenly distributed along the circumferential direction of the flexible housing 110, so that the strain sensors 200 can sense the deformations occurring in multiple directions of the touch pen tip 100, thereby improving the sensitivity of the touch pen tip 100.

[0049] The writing device is used for writing on a touch display device. When the writing device writes on the touch display device, the touch display device 300 receives the sensing information of the strain sensor 200, and the touch display device 300 determines the thickness of the writing stroke of the touch pen tip 100 according to the preset relationship between the sensing information and the thickness of the writing stroke of the touch pen tip 100. When performing a touch operation, an operation information exchange interface is provided for the user. Specifically, the touch display device 300 can display the writing stroke of the touch pen tip 100, thereby simulating a real writing scenario. The touch display device 300 can be a device with a display screen such as a mobile phone, a computer, an electronic watch, a television, a reader, etc. The present application does not limit the specific type of the touch display device 300. There are many ways to transmit information between the touch display device 300 and the strain sensor 200. For example, the touch display device 300 and the strain sensor 200 can transmit information through a wire, WIFI, Bluetooth, etc. Therefore, the present application does not limit the specific connection method between the touch display device 300 and the strain sensor 200.

[0050] The strain sensor 200 can be made of a piezoelectric material, and the deformation amount of the strain sensor 200 is determined by the voltage change at both ends of the strain sensor 200, and then the deformation amount of the touch pen tip 100 is determined to realize the morphological monitoring of the touch pen tip 100.

[0051] Furthermore, the writing device can further include a charging circuit and a power storage unit. The charging circuit is connected to the power storage unit, and the charging circuit is connected to the strain sensor 200 to store the electric energy generated by the strain sensor 200 in the power storage unit through the charging circuit, thereby improving the battery life of the writing device. Specifically, the charging circuit and the power storage unit can be disposed in the pen barrel 400.

[0052] It should be noted that, in this document, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation, an element defined by the phrase "comprising an..." does not exclude the presence of additional identical elements in the process, method, article or device comprising that element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in the reverse order according to the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0053] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Those of ordinary skill in the art, under the inspiration of the present application and without departing from the spirit and scope protected by the claims of the present application, can still make many forms, all of which fall within the protection scope of the present application.

Claims

1. A writing device, characterized in that, It includes a touch pen tip, an electromagnetic coil, a strain sensing element, a charging circuit and a power storage unit. The touch pen tip includes a flexible housing filled with magnetostrictive material. A first cavity is provided in the flexible housing. The magnetostrictive material filling is disposed in the first cavity, and the magnetostrictive material filling supports the flexible housing. The electromagnetic coil is disposed at one end of the flexible housing. When the electromagnetic coil is energized, at least part of the magnetostrictive material filling is located in the magnetic field generated by the electromagnetic coil, and the hardness of the magnetostrictive material filling can be adjusted. The strain sensing element is disposed on the flexible housing of the touch pen tip. The strain sensing element is made of piezoelectric material. The strain sensing element can deform with the touch pen tip, and the amount of deformation of the strain sensing element is determined by the voltage change at both ends of the strain sensing element, so that the strain sensing element can sense the amount of deformation of the touch pen tip and determine the thickness of the user's writing stroke according to the amount of deformation of the touch pen tip. The charging circuit is connected to the power storage unit and the strain sensing element. The charging circuit stores the electric energy generated by the strain sensing element in the power storage unit.

2. The writing device according to claim 1, characterized in that, The electromagnetic coil is disposed at one end of the flexible housing away from the writing end.

3. The writing device according to claim 1, characterized in that, The number of the electromagnetic coils is multiple, and the multiple electromagnetic coils are arranged in an array at one end of the flexible housing.

4. The writing device according to claim 3, characterized in that, It further includes a drive circuit. The drive circuit is connected to the electromagnetic coil, and the drive circuit adjusts the intensity of the magnetic field generated by each electromagnetic coil.

5. The writing device according to claim 1, characterized in that, The flexible housing is conical, and the strain sensing element is disposed along the generatrix direction of the flexible housing.

6. The writing device according to claim 5, characterized in that, The number of the strain sensing elements is at least two, and the at least two strain sensing elements are evenly distributed along the circumferential direction of the flexible housing.

7. The writing device according to claim 1, characterized in that, The writing device is used for writing on a touch display device. When the writing device writes on the touch display device, the touch display device receives the sensing information of the strain sensing element, and the touch display device determines the thickness of the writing stroke of the touch pen tip according to the preset relationship between the sensing information and the thickness of the writing stroke of the touch pen tip and displays it.

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