Capacitive stylus pressure protection mechanism

Abstract

The utility model discloses a kind of capacitive stylus pressure sensing protection mechanism, including pen shell, pen nib, module front support, main support, pen nib support, the main support is installed in the inside of pen shell, module front support is installed in one end of main support, and one end of module front support forms mounting groove, the one end of main support towards mounting groove opening forms pressure surface, pressure sensor is installed on pressure surface, pen nib support is set in mounting groove, and the inside of pen nib support is provided with silica gel pad and the pressure stick for transmitting pressure, pen nib is set in the head of pen shell. The utility model is simple in structure, in less than certain pressure range, the pressure that the pen nib is applied to outside accurately is transmitted to pressure sensor, when the pressure that the pen nib is applied to outside is greater than certain set value, pressure sensor will be protected, to avoid damage.

Description

Technical Field

[0001] This utility model relates to the field of capacitive pen technology, specifically to a capacitive pen pressure-sensitive protection mechanism. Background Technology

[0002] With the widespread use of touch-screen electronic devices, capacitive pens, as tools for precise input and creation, are facing increasingly higher performance requirements. Among these, pressure sensing is a key indicator of capacitive pen performance. It can detect the amount of pressure applied to the pen tip when the user writes or draws, thereby simulating changes in line thickness, color intensity, and other aspects to simulate the experience of a real pen stroke.

[0003] To achieve subtle pressure sensitivity, capacitive pens typically employ sophisticated pressure-sensing components (such as strain gauges and MEMS sensors). These components are inherently fragile and have a limited pressure threshold. When a user unintentionally applies excessive pressure while writing or drawing, or when the pen tip is accidentally dropped or impacted, the resulting impact force can easily exceed the sensor's maximum range, leading to decreased sensitivity, signal distortion, or even permanent damage. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a capacitive pen pressure-sensitive protection mechanism that can protect the pressure sensor, thereby solving the problems mentioned in the background art.

[0005] This utility model is achieved through the following technical solution: a capacitive pen pressure-sensitive protection mechanism, including a pen shell, a pen tip, a module front bracket, a main bracket, and a pen tip bracket. The main bracket is installed inside the pen shell, the module front bracket is installed at one end of the main bracket, and one end of the module front bracket forms an installation groove. The end of the main bracket facing the opening of the installation groove forms a pressure-bearing surface, and a pressure sensor is installed on the pressure-bearing surface. The pen tip bracket (7) is set in the installation groove, and a silicone pad and a pressure rod for transmitting pressure are set inside the pen tip bracket. The pen tip is set at the head of the pen shell, and one end of the pen tip passes through the module front bracket and is installed on the pen tip bracket.

[0006] As a preferred technical solution, one end of the pen tip support protrudes to form a connecting part, and one end of the pen tip is installed in the connecting part. A pre-compression spring is sleeved on the outside of the connecting part. The two ends of the pre-compression spring are fixedly connected to the front support of the module and the pen tip support (7) respectively. The pre-compression spring is fixedly connected to the main board inside the pen shell through a wire. The end of the front support of the module away from the main support is recessed to form an annular groove. An electrode is installed in the annular groove, and the electrode is welded to the main board through a long bent leg.

[0007] As a preferred technical solution, multiple inner buckles are formed by protruding inward on the outer wall of the pen tip holder, and a snap-fit ​​groove is formed by recessing on the outer wall of the pressure bar. The inner buckle is inserted into the snap-fit ​​groove and snap-fitted and fixed with the pressure bar.

[0008] As a preferred technical solution, the pen tip holder (7) is made of conductive plastic material.

[0009] As a preferred technical solution, the pressure bar is made of a high-hardness insulating material.

[0010] As a preferred technical solution, an overload protection gap is formed between the pen tip holder (7) and the pressure-bearing surface of the main holder.

[0011] As a preferred technical solution, the annular groove and the electrode are arranged in a conical structure, and the electrode is a TX02 electrode.

[0012] The beneficial effects of this utility model are: the utility model has a simple structure, and within a certain pressure range, it accurately transmits the pressure applied to the pen tip to the pressure sensor. When the pressure applied to the pen tip exceeds a certain set value, the pressure sensor will be protected to prevent damage. In addition, it keeps the pen tip sufficiently stable, without tilting or shaking. At the same time, the pen tip support and the pressure bar are connected by an internal snap-fit, reducing one intermediate component. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the structure of this utility model after the pen shell is removed; Figure 3 This is a schematic diagram of the pen tip holder of this utility model; Figure 4 This is a partially enlarged view of the present invention.

[0015] The components include: 1. Pen shell; 2. Pen tip; 3. Main support; 4. Module front support; 5. Electrode; 6. Preload spring; 7. Pen tip support; 8. Connecting part; 9. Silicone pad; 10. Pressure rod; 11. Pressure sensor; 12. Inner buckle. Detailed Implementation

[0016] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0017] All features disclosed in this specification, or all steps in all disclosed methods or processes, may be combined in any way, except for mutually exclusive features and / or steps.

[0018] Any feature disclosed in this specification (including any appended claims, abstract, and drawings) may be replaced by other equivalent or similar features for a similar purpose, unless specifically stated otherwise. That is, unless specifically stated otherwise, each feature is merely one example of a series of equivalent or similar features.

[0019] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, a capacitive pen pressure-sensitive protection mechanism of this utility model includes a pen shell 1, a pen tip 2, a module front bracket 4, a main bracket 3, and a pen tip bracket 7. The main bracket 3 is installed inside the pen shell 1, the module front bracket 4 is installed at one end of the main bracket 3, and one end of the module front bracket 4 forms a mounting groove. The end of the main bracket 3 facing the opening of the mounting groove forms a pressure-bearing surface, and a pressure sensor 11 is installed on the pressure-bearing surface. The pen tip bracket 7 is set in the mounting groove, and a silicone pad 9 and a pressure rod 10 for transmitting pressure are set inside the pen tip bracket 7. The pen tip 2 is set at the head of the pen shell 1, and one end of the pen tip 2 passes through the module front bracket 4 and is installed on the pen tip bracket 7.

[0020] In this embodiment, one end of the pen tip support 7 protrudes to form a connecting part 8, one end of the pen tip 2 is installed in the connecting part 8, and a preload spring 6 is sleeved on the outside of the connecting part 8. The two ends of the preload spring 6 are fixedly connected to the module front support 4 and the pen tip support 7 respectively. The preload spring 6 is fixedly connected to the main board inside the pen shell 1 through a wire. The end of the module front support 4 away from the main support 3 is recessed to form an annular groove. An electrode 5 is installed in the annular groove. The electrode 5 is welded to the main board through a long bent leg. The preload spring plays a "dual role" here: it is both a mechanical component and an electrical component. Role 1: Mechanical Functions (Preload and Reset) Provides pre-compression: The spring is pre-compressed to provide a forward force to the nib holder, which ensures that the nib remains stably in its initial position when not in use, eliminating any wobble.

[0021] Provides restoring force: When the pen tip is pressed down while writing, the spring is further compressed; when the pen is lifted, the spring's restoring force can immediately push the pen tip support and pen tip back to their original positions, ensuring smooth writing.

[0022] Role Two: Electrical Function (Conductive Path) Forming a conductive bridge: This is the key reason for its connection to the motherboard. The preload spring is usually made of conductive materials such as gold-plated or stainless steel.

[0023] Signal transmission path: It acts as a flexible conductor, transmitting the electrical signals generated by the motherboard to the pen tip holder made of conductive plastic.

[0024] Ultimately, the signal travels through the conductive pen tip holder and eventually reaches the pen tip itself. In this way, the pen tip becomes an electrode that transmits the signal.

[0025] In this embodiment, multiple inner buckles 12 are formed by protruding inward on the outer wall of the pen tip holder 7, and a snap-fit ​​groove is formed by recessing on the outer wall of the pressure rod 10. The inner buckle is inserted into the snap-fit ​​groove and snap-fitted and fixed to the pressure rod 10.

[0026] In this embodiment, the pen tip holder 7 is made of conductive plastic material, which enables the pen tip holder to conduct electricity.

[0027] In this embodiment, the pressure rod 10 is made of a high-hardness insulating material, which avoids conductivity and increases safety.

[0028] In this embodiment, an overload protection gap is formed between the pressure-bearing surfaces of the pen tip holder 7 and the main holder 3.

[0029] In this embodiment, the annular groove and electrode 5 are arranged in a conical structure, and electrode 5 is a TX02 electrode.

[0030] A preset pressure is generated by using a compressed silicone pad. If the pen tip pressure is less than this pressure value, the pressure can be accurately transmitted to the pressure sensor. If the pen tip pressure is greater than this pressure value, the pen tip holder will generate a movement and fit into the pressure-bearing surface of the main holder, thereby protecting the sensor from overload.

[0031] When the pressure applied to the pen tip continues to increase and exceeds the safety threshold designed by the system, the displacement of the pen tip support will cause the preset overload protection gap to disappear, and one end of the pen tip support will directly come into contact with the bearing surface of the main support.

[0032] Instantaneous force path switching: The vast majority, or even all, of the impact force will be transmitted through this new path: "pen tip → pen tip support → main support (load-bearing surface)".

[0033] Once this rigid bypass is formed, the enormous force is borne and dispersed by the robust pen tip holder and main support, completely preventing these destructive loads from continuing to act on the pressure sensor behind, thus achieving ultimate and reliable overload protection.

[0034] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any changes or substitutions conceived without inventive effort should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope defined in the claims.

Claims

1. A capacitive pen pressure-sensitive protection mechanism, characterized in that: The pen includes a pen shell (1), a pen tip (2), a module front bracket (4), a main bracket (3), and a pen tip bracket (7). The main bracket (3) is installed inside the pen shell (1). The module front bracket (4) is installed at one end of the main bracket (3), and one end of the module front bracket (4) forms a mounting groove. The end of the main bracket (3) facing the opening of the mounting groove forms a pressure bearing surface. A pressure sensor (11) is installed on the pressure bearing surface. The pen tip bracket (7) is set in the mounting groove, and a silicone pad (9) and a pressure rod (10) for transmitting pressure are set inside the pen tip bracket (7). The pen tip (2) is set at the head of the pen shell (1), and one end of the pen tip (2) passes through the module front bracket (4) and is installed on the pen tip bracket (7).

2. The capacitive pen pressure-sensitive protection mechanism according to claim 1, characterized in that: One end of the pen tip support (7) protrudes to form a connecting part (8), and one end of the pen tip (2) is installed in the connecting part (8). A preload spring (6) is sleeved on the outside of the connecting part (8). The two ends of the preload spring (6) are fixedly connected to the front support of the module (4) and the pen tip support (7) respectively. The preload spring (6) is fixedly connected to the main board inside the pen shell (1) through a wire. The end of the front support of the module (4) away from the main support (3) is recessed to form an annular groove. An electrode (5) is installed in the annular groove. The electrode (5) is welded to the main board through a long bent leg.

3. The capacitive pen pressure-sensitive protection mechanism according to claim 1, characterized in that: Multiple inner buckles (12) are formed by protruding inward on the outer wall of the pen tip holder (7), and a snap-fit ​​groove is formed by recessing on the outer wall of the pressure bar (10). The inner buckle is inserted into the snap-fit ​​groove and snap-fitted and fixed with the pressure bar (10).

4. The capacitive pen pressure-sensitive protection mechanism according to claim 1, characterized in that: The pen tip holder (7) is made of conductive plastic material.

5. The capacitive pen pressure-sensitive protection mechanism according to claim 1, characterized in that: The pressure bar (10) is made of a high-hardness insulating material.

6. The capacitive pen pressure-sensitive protection mechanism according to claim 1, characterized in that: An overload protection gap is formed between the pressure-bearing surfaces of the pen tip holder (7) and the main support (3).

7. The capacitive pen pressure-sensitive protection mechanism according to claim 1, characterized in that: The annular groove and the electrode (5) are arranged in a conical structure, and the electrode (5) is a TX02 electrode.

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