EP-4737518-A1 - COMPOSITE MATERIAL, STYLUS TIP, STYLUS TIP ASSEMBLY, STYLUS AND FORMING METHOD

Abstract

This application relates to the field of touch technologies, and discloses a composite material, a stylus tip, a stylus tip assembly, a stylus, and a forming method. The composite material includes at least a mixture of fiber and thermoplastic resin, the fiber and the thermoplastic resin are bonded to each other to jointly form a first porous structure, a second porous structure is formed inside the fiber, and the first porous structure and the second porous structure have resilience. The composite material provided in this application can effectively increase a writing amplitude, so that a rustling sound and a gritty sensation are generated in a writing process, and a user can feel a realistic texture similar to that of writing on paper.

Inventors

• WU, QIAO
• LI, DONGYANG
• GAO, Xinshang
• BAI, Lei
• YANG, Qingzhi
• TU, Yiming

Assignees

• Huawei Technologies Co., Ltd.

Dates

Publication Date

20260506

Application Date

20240705

Claims (20)

1. A composite material, wherein the composite material comprises at least a mixture of fiber and thermoplastic resin, the fiber and the thermoplastic resin are bonded to each other to jointly form a first porous structure, a second porous structure is formed inside the fiber, and the first porous structure and the second porous structure have resilience.
2. The composite material according to claim 1, wherein the fiber is conductive fiber obtained through conductive processing, and/or the thermoplastic resin is conductive thermoplastic resin obtained through conductive processing.
3. The composite material according to claim 2, wherein the composite material further comprises a mixture of a conductive filler, fiber, and thermoplastic resin.
4. The composite material according to claim 3, wherein the conductive filler comprises carbon, metal powder, or metal fiber.
5. The composite material according to any one of claims 2 to 4, wherein conductivity of the composite material ranges from 0.001 S/m to 1 S/m.
6. The composite material according to claim 1, wherein the fiber comprises polyester fiber, polyester fiber, acrylic fiber, nylon fiber, carbon fiber, aramid fiber, or glass fiber.
7. The composite material according to claim 1, wherein the thermoplastic resin comprises polyurethane resin, polycarbonate resin, polyoxymethylene resin, or thermoplastic polyamide elastomer resin.
8. The composite material according to claim 1, wherein a weight of the fiber accounts for 40% to 70% of a total weight of the composite material, and a weight of the thermoplastic resin accounts for 20% to 50% of the total weight of the composite material.
9. The composite material according to claim 3, wherein a weight of the fiber accounts for 10% to 30% of a total weight of the composite material, a weight of the thermoplastic resin accounts for 60% to 90% of the total weight of the composite material, and a weight of the conductive filler accounts for 2% to 10% of the total weight of the composite material.
10. A stylus tip, wherein a material of a writing end of the stylus tip is the composite material according to any one of claims 1 to 9.
11. The stylus tip according to claim 10, wherein a material of the stylus tip is the composite material, and the composite material is conductive.
12. A stylus tip assembly, comprising a housing and the stylus tip according to claim 10 or 11, wherein the stylus tip comprises a head portion and a shank portion that are connected in a first direction, the writing end is disposed on the head portion, and the shank portion is inserted into the housing; and the shank portion comprises a first shank segment, the first shank segment is attached to an inner wall of the housing, an outer diameter of the first shank segment gradually increases from a first end to a second end of the first shank segment, and the first end is closer to the head portion than the second end.
13. The stylus tip assembly according to claim 12, wherein the stylus tip is mushroom-shaped, the head portion forms a mushroom head, and the shank portion forms a mushroom stem.
14. The stylus tip assembly according to claim 12, wherein a material of the housing is an injection molding material.
15. The stylus tip assembly according to claim 12, wherein a material of the housing comprises polycarbonate or an acrylonitrile-butadiene-styrene copolymer.
16. A stylus, comprising a stylus barrel and the stylus tip assembly according to any one of claims 12 to 15, wherein the stylus tip assembly is connected to the stylus barrel through the housing.
17. A method for forming a composite material, wherein the method comprises: obtaining a fiber tow; performing impregnation processing on the fiber tow, to obtain a fiber tow coated with thermoplastic resin on a surface; and curing the thermoplastic resin coated on the surface of the fiber tow, to obtain the composite material.
18. The method according to claim 17, wherein the fiber tow is a conductive fiber tow obtained through conductive processing.
19. The method according to claim 18, wherein the conductive processing comprises: cleaning the fiber tow by using an alkaline solution; soaking a cleaned fiber tow in a metal salt solution, to attach metal ions to the surface of the fiber tow; and reducing the metal ions attached to the surface of the fiber tow, so that the fiber tow is conductive.
20. The forming method according to claim 17, wherein the fiber tow is a fiber tow obtained after grinding processing.

Description

This application claims priority to Chinese Patent Application No. 202311289201.3, filed with the China National Intellectual Property Administration on September 27, 2023 and entitled "COMPOSITE MATERIAL, STYLUS TIP, STYLUS TIP ASSEMBLY, STYLUS, AND FORMING METHOD", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of touch technologies, and in particular, to a composite material, a stylus tip, a stylus tip assembly, a stylus, and a forming method. BACKGROUND With the popularization of electronic devices with a touch function, such as a mobile phone, a computer, and a graphics tablet, in people's life and work, a stylus has gradually become one of mainstream human-computer interaction manners. A user can implement a touch operation on a touch device through tapping or sliding on a touchscreen of the touch device by using a stylus tip of a stylus. Currently, styluses on the market are mainly classified into electromagnetic styluses and capacitive styluses. For a capacitive stylus, a stylus tip of the stylus transmits an electrical signal. When the capacitive stylus approaches a touchscreen, an electric field on the touchscreen is interfered with, and capacitance inside the touchscreen also changes. By measuring this capacitance change, the system may determine a position of the capacitive stylus on the touchscreen, to implement a touch operation. The capacitive stylus is favored because of low costs and good compatibility. However, due to a limitation of a material of a stylus tip currently, when a user uses a capacitive stylus to perform an operation such as writing, it is difficult for the user to feel a realistic texture similar to that of writing on paper, and writing experience needs to be improved. SUMMARY To resolve the foregoing technical problem, this application provides a composite material, a stylus tip, a stylus tip assembly, a stylus, and a forming method. The following describes this application from a plurality of aspects, and mutual reference may be made to implementations and beneficial effects of the following plurality of aspects. A first aspect of this application provides a composite material, where the composite material includes at least a mixture of fiber and thermoplastic resin, the fiber and the thermoplastic resin are bonded to each other to jointly form a first porous structure, a second porous structure is formed inside the fiber, and the first porous structure and the second porous structure have resilience. Based on this implementation of this application, when the composite material is in contact with and slides relative to another object (for example, a touchscreen described in the following embodiment), the first porous structure and the second porous structure are subject to stress. With a change of a magnitude of the stress, the first porous structure and the second porous structure compress and rebound, and air in the first porous structure and the second porous structure is accordingly compressed and released, causing large vibration, so that particles inside the first porous structure and the second porous structure collide and move against each other, and a distinct rustling sound and a distinct gritty sensation are generated, thereby effectively improving writing experience. In a possible implementation of the first aspect, the fiber is conductive fiber obtained through conductive processing, and/or the thermoplastic resin is conductive thermoplastic resin obtained through conductive processing. In this way, the composite material can be conductive. In a possible implementation of the first aspect, the composite material further includes a mixture of a conductive filler, fiber, and thermoplastic resin. In this way, conductivity of the composite material is further improved. In a possible implementation of the first aspect, the conductive filler includes carbon, metal powder, or metal fiber. In a possible implementation of the first aspect, conductivity of the composite material ranges from 0.001 S/m to 1 S/m. In a possible implementation of the first aspect, the fiber includes polyester fiber, polyester fiber, acrylic fiber, nylon fiber, carbon fiber, aramid fiber, or glass fiber. In a possible implementation of the first aspect, the thermoplastic resin includes polyurethane resin, polycarbonate resin, polyoxymethylene resin, or thermoplastic polyamide elastomer resin. In a possible implementation of the first aspect, a weight of the fiber accounts for 40% to 70% of a total weight of the composite material, and a weight of the thermoplastic resin accounts for 20% to 50% of the total weight of the composite material. In a possible implementation of the first aspect, a weight of the fiber accounts for 10% to 30% of a total weight of the composite material, a weight of the thermoplastic resin accounts for 60% to 90% of the total weight of the composite material, and a weight of the conductive filler account