Stylus based on universal ballpoint pen refill

Abstract

The application discloses a touch pen based on a general ballpoint pen refill, which comprises a ballpoint pen refill, a pen body, a pen head, a pen tip cap, a control mainboard, a main support, a grounding pipe, an inclination signal pipe, a pen tip signal contact pipe, a pen tip signal contact cylinder, a grounding cap and a contact spring clamp; the pen tip signal contact pipe is connected with the control mainboard; the pen tip signal contact cylinder is detachably connected with the pen tip signal contact pipe; the front end of the ballpoint pen refill is inserted into the pen tip signal contact cylinder; the grounding cap is sleeved on the pen tip signal contact cylinder; the contact spring clamp is arranged between the grounding cap and the pen tip signal contact cylinder; the front end of the contact spring clamp is provided with a clamping part for clamping the metal pen tip at the front end of the ballpoint pen refill; the tail end of the grounding cap is in abutment with the grounding pipe; the grounding cap and the grounding pipe are made of metal pipes; and the surfaces of the grounding cap and the grounding pipe are provided with insulating coating layers. The metal pen tip of the ballpoint pen refill is used as an electrode to realize the functions of the electronic pen and the ballpoint pen, and the structure is simple and convenient for assembly and production.

Description

Technical Field

[0001] This invention relates to the field of electronic pen technology, and more particularly to a stylus based on a universal ballpoint pen refill. Background Technology

[0002] With the emergence of electronic products with touchscreens such as tablets, electronic touchpads have become a common writing tool. However, there are still scenarios where both traditional ballpoint pens and electronic pens are needed, and carrying two pens adds inconvenience. Therefore, some technical solutions combining ballpoint pens and electronic pens have emerged in this field. For example, patent application number 202211090691X, entitled "Electronic Pen Based on Metal Ballpoint Pen Refill," discloses a technical solution for an electronic pen using a metal ballpoint pen refill. However, the metal ballpoint pen refill used in this solution is not commonly used, and once the ink in the refill runs out, it is not easy for users to find a replacement. Therefore, there is an urgent need for an electronic pen technical solution using a universal ballpoint pen refill. Summary of the Invention

[0003] The technical problem to be solved by the embodiments of the present invention is to provide a stylus based on a universal ballpoint pen refill, so that the functions of an electronic pen and a ballpoint pen can be realized by using a universal ballpoint pen refill.

[0004] To address the aforementioned technical problems, this invention proposes a stylus based on a universal ballpoint pen refill, comprising a ballpoint pen refill, pen body, pen tip, pen tip cap, control motherboard, main support, grounding tube, and tilting signal tube. It also includes a pen tip signal contact tube, a pen tip signal contact cylinder, a grounding cap, and a contact spring clip. The pen tip signal contact tube is connected to the control motherboard, and the pen tip signal contact cylinder is detachably connected to the pen tip signal contact tube. The front end of the ballpoint pen refill is inserted into the pen tip signal contact cylinder, and the grounding cap is fitted onto the pen tip signal contact cylinder. The contact spring clip is positioned between the grounding cap and the pen tip signal contact cylinder. The front end of the contact spring clip has a clamping part for holding the metal pen tip of the ballpoint pen refill. The rear end of the grounding cap is in contact with the grounding tube. Both the grounding cap and the grounding tube are made of metal tubing, and both surfaces of the grounding cap and the grounding tube are coated with an insulating layer.

[0005] Furthermore, it also includes an isolation ring made of insulating material, which is placed between the grounding cap and the pen tip signal contact tube to prevent the distance between the grounding cap and the pen tip signal contact tube from being too close.

[0006] Furthermore, there is a threaded connection between the pen tip signal contact cylinder and the pen tip signal contact tube.

[0007] Furthermore, it also includes a rotating block, with a pen refill sleeve inside the pen body, and the rotating block located at the rear end of the pen refill sleeve inside the pen body; the end of the ballpoint pen refill passes through the pen refill sleeve; a rotating shaft is provided on one side of the front end of the rotating block, and the rotating block is wound around inside the pen body through the rotating shaft; a moving plate is provided on the rear end of the rotating block; a displacement sensor for detecting the displacement of the moving plate is provided on the control main board; a pressure contact is protruding on the rear end face of the pen refill sleeve or the front end face of the rotating block.

[0008] Furthermore, a preload spring is installed at the front end of the pen refill sleeve to apply backward pressure to the pen refill sleeve, and a return spring is correspondingly installed at the rear end of the rotating block.

[0009] Furthermore, the inner wall of the pen refill sleeve is provided with protrusions to increase the friction between the pen refill and the outer wall of the ballpoint pen refill.

[0010] Furthermore, the inner side of the pen tip has an inward buckle, and the outer side of the pen tip cap has a corresponding outward buckle.

[0011] Furthermore, it also includes an overload spring seat, a pen refill sleeve is provided inside the pen body, the overload spring seat is located inside the pen body at the rear end of the pen refill sleeve; the end of the ballpoint pen refill passes through the pen refill sleeve; an overload spring is provided between the overload spring seat and the pen refill sleeve, and a pressure sensor corresponding to the overload spring seat is provided on the control main board.

[0012] The beneficial effects of this invention are as follows: This invention uses a phase-conducting pen tip signal contact tube, pen tip signal contact cylinder, and contact spring clip, which facilitates the replacement and disassembly of the ballpoint pen refill. At the same time, it also uses the metal pen tip of the ballpoint pen refill as an electrode to lead the signal to the control motherboard. This invention also uses a displacement sensor to detect the pressure change of the pen tip to realize the electronic pen function. The structure is simple and easy to assemble and produce. Attached Figure Description

[0013] Figure 1 This is a three-dimensional structural diagram of a stylus based on a universal ballpoint pen refill, according to an embodiment of the present invention.

[0014] Figure 2 This is a cross-sectional view along the central axis of a stylus based on a universal ballpoint pen refill according to an embodiment of the present invention.

[0015] Figure 3 yes Figure 2 Enlarged view of point A in the middle.

[0016] Figure 4 yes Figure 2 Enlarged view of point B in the middle.

[0017] Figure 5 This is a three-dimensional structural diagram of the pen tip cap according to an embodiment of the present invention.

[0018] Figure 6 This is a three-dimensional structural diagram of the contact spring clip according to an embodiment of the present invention.

[0019] Figure 7 This is a three-dimensional structural diagram of the pen tip signal contact cylinder and grounding cap according to an embodiment of the present invention.

[0020] Figure 8 This is a cross-sectional view along the central axis of a stylus based on a universal ballpoint pen refill in the form of a ballpoint pen, according to an embodiment of the present invention.

[0021] Figure 9 This is an internal structural diagram of the tail of a stylus based on a universal ballpoint pen refill, according to an embodiment of the present invention.

[0022] Figure 10 This is a three-dimensional structural diagram of the rotating block according to an embodiment of the present invention.

[0023] Figure 11 This is a schematic diagram of the finished product structure of the pen refill sleeve according to an embodiment of the present invention.

[0024] Figure 12 This is an internal structure diagram of the front end of a stylus based on a universal ballpoint pen refill, according to an embodiment of the present invention.

[0025] Figure 13 This is a three-dimensional structural diagram of the pen tip signal contact cylinder and the isolation ring according to an embodiment of the present invention.

[0026] Figure 14 This is a cross-sectional view along the central axis of a stylus based on a universal ballpoint pen refill, according to another embodiment of the present invention.

[0027] Figure 15 This is a perspective view of the overload spring seat according to an embodiment of the present invention.

[0028] Explanation of icon numbers

[0029] 1. Ballpoint pen refill, 2. Pen body, 3. Pen tip, 4. Pen tip cap, 5. Control board, 6. Main bracket, 7. Grounding tube, 8. Tilt signal tube, 9. Pen tip signal contact tube, 10. Pen tip signal contact cylinder, 11. Grounding cap, 12. Contact spring clip, 13. Clamping part, 14. Isolation ring, 15. Pen refill sleeve, 16. Rotating block, 17. Rotating shaft, 18. Moving plate, 19. Displacement sensor, 20. Pressure contact, 21. Preload spring, 22. Reset spring, 23. Overload spring seat, 24. Overload spring, 25. Pressure sensor. Implementation

[0030] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] In this embodiment of the invention, directional indicators (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationship and movement of each component in a specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0032] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features.

[0033] Please refer to Figures 1 to 13 The stylus based on a universal ballpoint pen refill in this embodiment of the invention includes a ballpoint pen refill, pen body, pen tip, pen tip cap, control motherboard, main bracket, grounding tube, tilting signal tube, pen tip signal contact tube, pen tip signal contact cylinder, grounding cap, and contact spring clip.

[0034] The control board consists of a mainboard FPC, circuitry on the FPC, and insulating reinforcing strips. The grounding tube is located around the outer ring of the pen tip signal contact tube, and is insulated from it. The tilt signal tube (TX2 signal tube) is located around the outer ring of the grounding tube, and is insulated from it. The grounding tube, tilt signal tube, and pen tip signal contact tube are soldered onto the control board.

[0035] The pen tip signal contact tube is connected to the control main board, and the pen tip signal contact cylinder is detachably connected to the pen tip signal contact tube. The pen tip signal contact tube is tubular. The tip of the ballpoint pen refill is inserted into the pen tip signal contact cylinder. A grounding cap is fitted onto the pen tip signal contact cylinder. A contact spring clip is installed between the grounding cap and the pen tip signal contact cylinder. The front end of the contact spring clip has a clamping part for holding the metal pen tip at the tip of the ballpoint pen refill. The clamping part is U-shaped or oblong. When the metal pen tip passes through, the narrower sides clamp the metal pen tip at the tip of the ballpoint pen refill, thus conducting electricity. The pen tip signal contact tube, pen tip signal contact cylinder, and contact spring clip are electrically connected, transmitting the metal pen tip signal to the control main board.

[0036] After installation, the grounding cap's tail end contacts the grounding pipe, establishing electrical continuity (the surfaces at the contact point are not insulated). Both the grounding cap and grounding pipe are made of metal tubing, and both have an insulating coating. The grounding cap and grounding pipe act as shielding around the pen tip signal contact tube and the outer ring of the pen tip signal contact cylinder. The insulating coating prevents short circuits between the metal pen tip signal, the ground signal, and the tilt signal.

[0037] As one implementation method, the stylus based on a common ballpoint pen refill also includes an insulating ring. The insulating ring is made of insulating material and is positioned between the grounding cap and the pen tip signal contact cylinder to prevent the distance between the grounding cap and the pen tip signal contact cylinder from being too close, which would affect the shielding effect. In a specific implementation, the insulating ring, grounding cap, and pen tip signal contact cylinder are glued together to form a module.

[0038] As one implementation method, the pen tip signal contact cylinder and the pen tip signal contact tube are connected by a thread, which facilitates disassembly and assembly.

[0039] As one implementation, the stylus based on a common ballpoint pen refill also includes a rotating block. A pen refill sleeve is located inside the pen body, and the rotating block is positioned at the rear end of the pen refill sleeve. The end of the ballpoint pen refill passes through the pen refill sleeve. A rotating shaft (with both ends mounted on a main support) is located on one side of the front end of the rotating block, which is wound around the pen body. A moving plate is located on the rear end of the rotating block. A displacement sensor for detecting the displacement of the moving plate is located on the main control board. A pressure contact is protruding from the rear end face of the pen refill sleeve or the front end face of the rotating block. The pressure contact is located in the middle. When the ballpoint pen refill writes, it moves the pen refill sleeve backward, which in turn causes the rotating block to rotate around the rotating shaft. This displacement is amplified through the lever principle and detected by the displacement sensor. The displacement sensor can be a light sensor (comprising a light source emitting and receiving parts). When the moving plate passes through, the light received flux of the light sensor changes, resulting in a signal change. Capturing this change allows the change in writing pressure at the pen tip to be detected. In practical implementation, the displacement sensor can also be a coil, and the moving plate can be made of a metal rod. A tiny displacement of the pen tip, amplified by the lever, produces a larger displacement, causing the metal rod to have a larger displacement within the coil under the alternating current, thus causing a large change in the electrical signal of the coil. Alternatively, the displacement sensor can be a Hall switch, and the moving plate can be made of a magnetic column. A tiny displacement of the pen tip, amplified by the lever, produces a larger displacement, causing the magnetic column to have a larger displacement and move closer to the Hall switch, thus causing a large change in the output electrical signal of the Hall switch.

[0040] In one embodiment, a preload spring is installed at the front end of the pen refill sleeve to apply rearward pressure to the pen refill sleeve, and a return spring is correspondingly installed at the rear end of the rotating block. The return spring resets the rotating block, and the force exerted by the return spring on the rotating block causes the rotating block to rotate in the direction of the preload spring.

[0041] In one embodiment, the inner wall of the pen refill sleeve is provided with protrusions to increase the friction between the pen refill and the outer wall of the ballpoint pen refill.

[0042] In one implementation, the pen tip has an inner buckle on the inner side of the front end and a corresponding outer buckle on the outer side of the end of the pen tip cap. When the pen tip cap is attached to the metal tip of the ballpoint pen refill, the inner and outer buckles interlock, and the stylus based on the universal ballpoint pen refill can be used as an electronic pen; removing the pen tip cap allows it to be used for writing on paper.

[0043] The working principle of this invention is as follows: The ballpoint pen refill and the refill sleeve are tightly fitted. The force required for inserting (removing) the ballpoint pen refill is set to F1, which represents the maximum static friction between them. When the ballpoint pen refill is inserted, due to the large insertion force between the refill and the refill sleeve, the refill is blocked and cannot be inserted. This causes the refill to push the refill sleeve, which in turn pushes the rotating block to rotate, compressing the return spring. When the refill sleeve moves a distance D, the return spring is compressed by D*L1 / L2. At this point, the return spring's counterforce on the rotating block is F2, and the counterforce of the rotating block on the refill sleeve is F2*L1 / L2. When F1 < F2*L1 / L2, the ballpoint pen refill will smoothly insert into the refill sleeve until it is blocked by the control board (the reinforcing plate of the control board). Releasing the ballpoint pen refill at this point causes the return spring to rebound, pushing the refill sleeve (along with the ballpoint pen refill) back to its original position until it is balanced with the pre-compression spring.

[0044] The process of disassembling and assembling the ballpoint pen refill of this invention is as follows:

[0045] a. When preparing to insert the ballpoint pen refill, the pressure of the preload spring on the pen refill sleeve and the pressure of the return spring on the rotating block bring the lever system into a balanced state.

[0046] b. After inserting the ballpoint pen refill, the rotating block cannot rotate because it is blocked by the inner wall of the pen body. Therefore, the ballpoint pen refill is pushed in forcefully to overcome the frictional resistance between the two and pass through the pen refill sleeve, where it is blocked by the reinforcing insulating sheet of the control board.

[0047] c. Release the ballpoint pen refill. The return spring rebounds and balances the lever system with the preload spring. During this process, there is no relative movement between the ballpoint pen refill and the refill sleeve. The ballpoint pen refill maintains a gap with the reinforcing insulating sheet of the control board. The size of this gap is the distance the rotating block (and the refill sleeve) moves along the pen's axis during rotation.

[0048] d. Screw in the pen tip signal contact tube and insert the pen tip cap.

[0049] e. During writing, as the writing pressure increases, the pen tip cap compresses the ballpoint pen refill (linking to the refill sleeve) and retracts, causing the rotating block to rotate. If the amplification ratio of the lever mechanism is L1 / L2=12, then for every 0.1mm retraction of the pen tip, the moving plate will produce a 1.2mm displacement, which will be detected by the displacement sensor. Furthermore, the magnitude of the pen tip pressure will be linearly related to both the pen tip displacement and the moving plate displacement; that is, the displacement of the moving plate is proportional to the magnitude of the pen tip pressure. Thus, a displacement sensor can be used to detect changes in pen tip pressure.

[0050] Please refer to Figures 14-15 As one implementation method, the stylus based on a common ballpoint pen refill also includes an overload spring seat, a pen refill sleeve inside the pen body, and an overload spring seat located inside the pen body at the rear end of the pen refill sleeve; the end of the ballpoint pen refill passes through the pen refill sleeve; an overload spring is provided between the overload spring seat and the pen refill sleeve, and a pressure sensor corresponding to the overload spring seat is provided on the control board.

[0051] This invention employs a pressure sensor to collect changes in the writing pressure of the pen tip. The overload spring is pre-compressed within the overload spring seat by the pen refill sleeve; this pre-compression is F. 过 This forms a component, which is compressed by a preload spring to ensure that the overload spring seat is always in close contact with the pressure sensor. This preload is F. 预 There is a large static frictional resistance F between the ballpoint pen refill and the refill sleeve. 摩 Set F 摩 Greater than F 过 F 过 Greater than 10*F 预 .

[0052] When the ballpoint pen refill is inserted, the overload spring is compressed until the refill is inserted and blocked by the reinforcing insulation plate of the control board. Releasing the refill releases the overload spring, and the refill maintains a gap with the reinforcing insulation plate of the control board.

[0053] When writing, the writing pressure is less than the overload spring preload F. 过 When the writing pressure is greater than the preload F of the overload spring, the overload spring will not activate, and the pen tip pressure will be transmitted to the pressure sensor; when the writing pressure is greater than the preload F of the overload spring... 过 When the writing pressure continues to increase, the overload spring will be compressed. As the writing pressure continues to increase, the ballpoint pen refill will be blocked by the reinforcing insulating sheet of the control motherboard, so that the excessive pressure will not be transmitted to the pressure sensor, thus protecting the pressure sensor.

[0054] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A touch pen based on a universal ballpoint refill, comprising a ballpoint refill, a pen body, a pen tip, a pen tip cap, a control mainboard, a main support, a grounding tube, and an inclination signal tube, characterized in that, The touch pen also comprises a pen tip signal contact tube, a pen tip signal contact cylinder, a grounding cap, and a contact spring clamp. The pen tip signal contact tube is connected with the control mainboard. The pen tip signal contact cylinder is detachably connected with the pen tip signal contact tube. The front end of the ballpoint pen refill is inserted into the pen tip signal contact cylinder. The grounding cap is sleeved on the pen tip signal contact cylinder. The contact spring clamp is arranged between the grounding cap and the pen tip signal contact cylinder. The front end of the contact spring clamp is provided with a clamping portion for clamping the metal pen tip at the front end of the ballpoint pen refill. The tail end of the grounding cap is in abutment with the grounding tube. The grounding cap and the grounding tube are made of metal tubes. Insulating coating layers are arranged on the surfaces of the grounding cap and the grounding tube. The clamping portion is in the shape of U or a long circle. When the metal pen tip passes through, the two narrow sides of the clamping portion clamp the metal pen tip at the front end of the ballpoint pen refill, thereby conducting electricity. The pen tip signal contact tube, the pen tip signal contact cylinder, and the contact spring clamp are in electrical connection, thereby transmitting the signal of the metal pen tip to the control mainboard. The touch pen also comprises a rotating block. The pen body is provided with a refill sleeve. The rotating block is arranged in the pen body at a position corresponding to the rear end of the refill sleeve. The ballpoint pen refill passes through the refill sleeve. The front end of the rotating block is provided with a rotating shaft which is arranged in the pen body. The rear end of the rotating block is provided with a moving piece. The control mainboard is provided with a displacement sensor for detecting the displacement of the moving piece. The rear end surface of the refill sleeve or the front end surface of the rotating block is provided with a pressure contact point.

2. The universal ballpoint refill-based stylus of claim 1, wherein, The touch pen also comprises an isolation ring. The isolation ring is made of insulating material. The isolation ring is arranged between the grounding cap and the pen tip signal contact cylinder, thereby preventing the distance between the grounding cap and the pen tip signal contact cylinder from being too close.

3. The universal ballpoint refill-based stylus of claim 1, wherein, The pen tip signal contact cylinder and the pen tip signal contact tube are in threaded connection.

4. The universal ballpoint refill-based stylus of claim 1, wherein, The front end of the refill sleeve is provided with a pre-compression spring for applying backward pressure to the refill sleeve. The rear end of the rotating block is provided with a return spring.

5. The universal ballpoint refill-based stylus of claim 1, wherein, The inner wall of the refill sleeve is provided with protrusions for increasing the friction between the inner wall of the refill sleeve and the outer wall of the ballpoint pen refill.

6. The universal ballpoint refill-based stylus of claim 1, wherein, The inner side of the front end of the pen head is provided with an inner buckle. The outer side of the tail end of the pen tip cap is provided with a corresponding outer buckle.

7. The universal ballpoint refill-based stylus of claim 1, wherein, The touch pen also comprises an overload spring seat. The pen body is provided with a refill sleeve. The overload spring seat is arranged in the pen body at a position corresponding to the rear end of the refill sleeve. The ballpoint pen refill passes through the refill sleeve. An overload spring is arranged between the overload spring seat and the refill sleeve. The control mainboard is provided with a pressure sensor corresponding to the overload spring seat.

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