A dual-core combined electromagnetic induction touch pen
Through the dual-core combined electromagnetic induction stylus, the inductance value in the LC resonant circuit is changed, and the problems of high prices of capacitor value-changing products and poor experience of inductance-changing products in the existing technology are solved, achieving a high-quality writing experience.
Patent Information
- Application Number
- CN202421497830.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-27
- Publication Date
- 2025-04-04
- Estimated Expiration
- 2034-06-27
AI Technical Summary
The existing electromagnetic induction touch stylus have high price or poor experience in realizing pressure induction, especially the high price of products with variable capacitance, while the inductance change product with poor experience and high labor costs.
The double-core combined electromagnetic induction stylus is adopted to change the inductance value in the LC resonant circuit through the combined dual-core linkage, thereby changing the resonant frequency, and improving the sensitivity of the writing pressure of the pen tip.
It achieves a high-quality writing experience without increasing purchase cost, and the pressure sensing stroke is controlled within 0.25mm, achieving the ideal pressure sensing sensitivity requirements.
Smart Images
Figure CN222719862U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of touch-control stylus pens, in particular to a double-core combined electromagnetic induction touch-control pen. Background Art
[0002] Among consumer electronic products, many existing products are equipped with electromagnetic induction (EMR) touch stylus (electromagnetic pen for short). In order to solve the problem of original handwriting input, existing products have introduced pressure sensing (i.e. pressure sensing, which is a way to digitally restore the thickness of font handwriting by writing force). In the scheme of implementing pressure sensing, one is to change the capacitance value of the resonant circuit in the product, and the other is to change the inductance in the resonant circuit to achieve pressure sensing. Among them, the usual method of changing the capacitance value mode is: the pen tip uses a magnetic core coil with a through hole to apply the force generated by writing to the capacitor element made of special material at the bottom of the magnetic core. The element changes the capacitance value through pressure changes, and cooperates with the LC resonant circuit composed of the inductor coil on the magnetic core. When the capacitance value changes, the oscillation frequency of the LC circuit is changed, thereby realizing the change of the pressure sense of the original handwriting. Since the main element of the pressure change in this scheme is the change in the capacitance of the pressure-variable capacitor, and the pressure action stroke is short (generally 0.3mm), the writing experience of the pen tip is good. However, due to the high difficulty of the production technology of the pressure-variable capacitor, the entry threshold of this technology is also high. It is difficult for domestic capacitor manufacturers to enter, resulting in a high unit price of this type of electromagnetic pen products. Another common method of changing the inductance mode is: the pen tip acts on the magnetic core, the magnetic core is covered with a plastic frame with a coil, and the bottom of the magnetic core is equipped with elastic silicone. When the pen tip is writing, the writing pressure is transmitted through the pen tip on the magnetic core, the magnetic core moves in the coil, the inductance of the coil changes, and the oscillation frequency of the LC resonant circuit is changed, thereby realizing the change of the pressure sense of the original handwriting. This method seems simple. When the handwriting and pressure sense change value appear in the electromagnetic pen, the frequency initial value needs to change from 2-3K, resulting in a longer pressure sense stroke (most domestic manufacturers now achieve 0.6mm-0.8mm), so the writing experience is poor. In mass production, the coil is wound on the plastic frame, resulting in large production errors in the inductance parameters and high labor costs.
[0003] In view of the above problems, the utility model proposes a dual-core combined electromagnetic induction touch pen. Summary of the invention
[0004] The purpose of the utility model is to provide a dual-core combined electromagnetic induction touch pen, which changes the inductance value in the LC resonant circuit through the combined dual magnetic core linkage, and changes the resonant frequency in the LC resonant circuit by changing the inductance value, so as to achieve the purpose of improving the writing pressure sensing sensitivity of the pen tip, thereby solving the problems in the prior art that the products with changing capacitance value are too expensive, the products with changing inductance value have poor user experience and high labor costs.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a dual-core combined electromagnetic induction touch pen, comprising a pen tip, a transmission mechanism is sleeved on the rear end of the pen tip, and an induction core and a conductive elastic member are sleeved on the transmission mechanism in sequence; it also includes a coil core with a through hole and a first bracket, the coil core is sleeved in the first bracket, and the transmission mechanism passes through the coil core and is sleeved in the first bracket; it also includes a PCBA and an FPCA circuit switch, the PCBA is electrically connected to the coil core and the FPCA circuit switch respectively, and the conductive elastic member is connected to the FPCA circuit switch when the pen tip is working.
[0006] Furthermore, the transmission mechanism includes a push rod sleeved on the rear end of the pen tip, the induction core sleeved on the end of the push rod close to the pen tip, the conductive elastic member sleeved on the tail end of the push rod, an adjustment fastener is provided between the induction core and the conductive elastic member, and a second elastic member is provided between the adjustment fastener and the conductive elastic member.
[0007] Preferably, the adjusting fastener comprises a nut, and the surface of the push rod is provided with a thread matching the nut.
[0008] Preferably, the end face distance between the induction core and the coil core is adjusted to 0.25 mm by the adjusting fastener.
[0009] Preferably, a magnetic core mounting seat is provided in the first bracket, and an end of the first bracket away from the magnetic core mounting seat is provided with an inner hole thread.
[0010] Furthermore, it also includes a second bracket, which has a threaded port matching the inner hole thread, and the rear end of the threaded port is provided with an FPCA mounting seat and a PCBA mounting seat in sequence.
[0011] Preferably, the gap between the conductive elastic member 9 and the FPCA circuit switch is adjusted to 0.05 mm by adjusting the connection position between the inner hole thread and the threaded port.
[0012] Furthermore, it also includes a third bracket sleeved outside the second bracket.
[0013] Preferably, the conductive elastic member is pressure-elastic silicone.
[0014] Preferably, the second elastic member is a spring.
[0015] Compared with the prior art, the beneficial effects of the utility model are as follows:
[0016] The utility model can control the pressure sensing stroke within 0.25mm to complete pressure sensing by adjusting the fasteners, FPCA circuit switches and electronic circuits, thereby achieving a relatively ideal pressure sensing sensitivity requirement and improving writing restoration, so that consumers can obtain a high-quality writing experience without increasing the purchase cost. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model;
[0018] Figure 2 It is a structural exploded diagram of the utility model;
[0019] Figure 3 It is an exploded view of the transmission mechanism of the present utility model.
[0020] In the figure: 1. pen tip; 2. magnetic core; 3. coil; 4. FPCA circuit switch; 5. PCBA; 6. inductive magnetic core; 7. push rod; 71. thread; 8. nut; 9. second elastic member; 10. conductive elastic member; 11. first bracket; 111. magnetic core mounting seat; 12. second bracket; 121. threaded port; 122. FPCA mounting seat; 123. PCBA mounting seat; 13. third bracket. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model. Example
[0022] like Figure 1-3 As shown, a dual-core combined electromagnetic induction touch pen of the present embodiment comprises a pen tip 1, a transmission mechanism is sleeved at the rear end of the pen tip 1, an induction core 6 and a conductive elastic member 10 are sleeved on the transmission mechanism in sequence, and the conductive elastic member is preferably a pressure-elastic silicone; the transmission mechanism comprises a push rod 7 sleeved at the rear end of the pen tip, the induction core is sleeved at one end of the push rod 7 close to the pen tip 1, the conductive elastic member 10 is sleeved at the tail end of the push rod 7, an adjusting fastener is provided between the induction core 6 and the conductive elastic member, the adjusting fastener comprises a nut 8, a thread 71 matching the nut 8 is provided on the surface of the push rod 7, a second elastic member 9 is provided between the nut 8 and the conductive elastic member 10, and the second elastic member 9 is preferably a spring.
[0023] The utility model also includes a magnetic core 2 with a through hole and a coil 3 wound on the magnetic core 2, wherein the magnetic core 2 and the coil 3 form a coil magnetic core, and the coil 3 is provided with a welding point A and a welding point B; it also includes a first bracket 11, wherein a magnetic core mounting seat 111 is provided inside the first bracket, and an end of the first bracket away from the magnetic core mounting seat 111 is provided with an inner hole thread; one end of the coil magnetic core is sleeved with the induction magnetic core 6, and the other end is sleeved in the magnetic core mounting seat 111; the push rod 7 is provided with an end of the induction magnetic core 6 that is clamped with the pen tip 1, and the other end passes through the through hole of the magnetic core 2 and is sleeved in the magnetic core mounting seat 111.
[0024] The utility model also includes PCBA5 and FPCA circuit switch 4, wherein the PCBA5 is electrically connected to the coil core and the FPCA circuit switch 4 respectively, the FPCA circuit switch 4 is provided with welding points C and welding points D, and the PCBA5 is provided with contacts A1 and B1 connected to the coil core, and contacts C1 and D1 connected to the FPCA circuit switch 4.
[0025] The utility model also includes a second bracket 12 and a third bracket 13, the second bracket has a threaded port 121 that matches the inner hole thread of the first bracket 11, and the rear end of the threaded port is provided with an FPCA mounting seat 122 and a PCBA mounting seat 123 in sequence, and the second bracket 12 is threadedly connected to the first bracket through the threaded port 121; the third bracket 13 is sleeved on the outside of the second bracket, and the end face of the third bracket 13 that is sleeved with the threaded port 121 is connected to the first bracket 11.
[0026] Preferably, by adjusting the connection position of the nut 8 and the thread 71, the end face spacing between the induction core 6 and the coil core can be adjusted to 0.25 mm, and by adjusting the connection position of the inner hole thread of the first bracket 11 and the threaded port 121, the gap between the conductive elastic member 9 and the FPCA circuit switch can be adjusted to 0.05 mm. Under the action of the second elastic member 9, the conductive elastic member 10 is connected to the FPCA circuit switch when the pen tip is working (that is, when the push rod 7 moves toward the direction of the FPCA circuit switch).
[0027] Preferably, the push rod 7, the first bracket 11, and the second bracket 12 are made of plastic material, and the third bracket 13 is made of stainless steel.
[0028] The assembly process of the utility model is as follows:
[0029] 1. Use a winding machine to wind an induction coil 3 of a certain specification onto a magnetic core 2 having a through hole to form a coil magnetic core, and assemble the coil magnetic core onto a magnetic core mounting seat 111 in a first bracket 11.
[0030] 2. Sleeve the induction core 6 with a through hole on the push rod 7, install the push rod 7 assembled with the induction core 6 into the assembly of the coil core and the first bracket 11, and twist the nut 8 onto the thread 71 of the push rod 7. Use a special clamp to adjust the end surface distance between the induction core 6 and the coil core on the push rod 7 to 0.25mm; sleeve the second elastic member 9 into the push rod 7, and install the conductive elastic member 10 into the tail end of the push rod 7. The conductive elastic member 10 is a conductive pressure-elastic silicone with dual characteristics of elasticity and conductivity.
[0031] 3. Screw the first bracket 11 assembly assembled in the above steps onto the port thread 121 of the second bracket 12 through the inner hole thread of the first bracket 11, install the FPCA circuit switch 4 into the FPCA mounting seat 122, and adjust the inner hole thread of the first bracket 11 so that the gap between the conductive elastic member 10 and the FPCA circuit switch 4 is 0.05 mm.
[0032] 4. Install PCBA5 into the PCBA mounting seat 123 of the second bracket 12, weld the welding points A and B of the coil 3 to A1 and B1 on PCBA5 respectively, and weld the welding points C and D of the FPCA circuit switch 4 to points C1 and D1 on PCBA5.
[0033] 5. The third bracket 13 is sleeved on the outside of the second bracket 12, and the front end of the third bracket 13 is connected to the rear end of the first bracket 11, and the electromagnetic induction stylus pen can be assembled into a complete one.
[0034] The working principle of the utility model is as follows:
[0035] When writing, when the pen tip 1 touches the display screen, the pen tip 1 drives the inductive core 6 to approach the coil core through the push rod 7, and the conductive elastic member 10 at the tail end of the push rod 7 contacts the FPCA circuit switch 4, connecting the electronic component in the circuit - the capacitor, and cooperating with the inductor coil to complete the LC frequency oscillation; when the pen tip force increases, the inductive core 6 continues to move backward, the inductance value of the coil core increases, the oscillation frequency changes, and the pressure sensing conversion is completed.
[0036] The utility model is aimed at electromagnetic induction stylus pens. The pressure sensing stroke requirement of such products is 0.2mm-0.3mm for the best writing feel. The design of this case adds adjustment fasteners, FPCA circuit switches and electronic circuits to the structure, so that the pressure sensing sensitivity requirement can be achieved at a stroke of 0.25mm.
[0037] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.
[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A dual-core combined electromagnetic induction touch pen, including a pen tip, characterized in that: The rear end of the pen tip is sleeved with a transmission mechanism, and the transmission mechanism is sleeved with an induction core and a conductive elastic member in sequence; it also includes a coil core with a through hole and a first bracket, the coil core is sleeved in the first bracket, and the transmission mechanism passes through the coil core and is sleeved in the first bracket; it also includes PCBA and FPCA circuit switches, the PCBA is electrically connected to the coil core and the FPCA circuit switch respectively, and the conductive elastic member is connected to the FPCA circuit switch when the pen tip is working; the transmission mechanism includes a push rod sleeved at the rear end of the pen tip, the induction core is sleeved at one end of the push rod close to the pen tip, the conductive elastic member is sleeved at the tail end of the push rod, an adjustment fastener is provided between the induction core and the conductive elastic member, and a second elastic member is provided between the adjustment fastener and the conductive elastic member.
2. The dual-core combined electromagnetic induction touch pen according to claim 1, characterized in that: The adjusting fastener comprises a nut, and a thread matching the nut is provided on the surface of the push rod.
3. The dual-core combined electromagnetic induction touch pen according to claim 1, characterized in that: The end face distance between the induction core and the coil core is adjusted to 0.25 mm by the adjusting fastener.
4. The dual-core combined electromagnetic induction touch pen according to claim 1, characterized in that: A magnetic core mounting seat is arranged inside the first bracket, and an end of the first bracket away from the magnetic core mounting seat is provided with an inner hole thread.
5. The dual-core combined electromagnetic induction touch pen according to claim 4, characterized in that: It also includes a second bracket, which has a threaded port matching the inner hole thread, and the rear end of the threaded port is provided with an FPCA mounting seat and a PCBA mounting seat in sequence.
6. The dual-core combined electromagnetic induction touch pen according to claim 5, characterized in that: The gap between the conductive elastic member and the FPCA circuit switch is adjusted to 0.05 mm by adjusting the connection position of the inner hole thread and the threaded port.
7. The dual-core combined electromagnetic induction touch pen according to claim 5, characterized in that: It also includes a third bracket which is sleeved outside the second bracket.
8. A dual-core combined electromagnetic induction touch pen according to any one of claims 1 to 7, characterized in that: The conductive elastic member is a pressure elastic silicone.
9. A dual-core combined electromagnetic induction touch pen according to any one of claims 1 to 7, characterized in that: The second elastic member is a spring.