Ferrite core and stylus pen including the same

Abstract

This invention relates to a ferrite core and a stylus including the same, and more specifically, to a ferrite core capable of mitigating the magnetization effects caused by an external magnetic material and a stylus including the same. According to an embodiment of the invention, the ferrite core is a ferrite core disposed inside a stylus, the ferrite core comprising 60% to 80% by weight of iron (Fe), 15% to 30% by weight of manganese (Mn), and 3% to 20% by weight of zinc (Zn).

Description

Technical Field

[0001] The present invention relates to a ferrite core and a stylus including the thereof, and more specifically, to a ferrite core capable of improving the magnetization effect caused by an external magnetic material and a stylus including the thereof. Prior Technology

[0002] A stylus is a pen-shaped device that allows users to input data by dragging or clicking on the screen.

[0003] Styluses can be categorized into active styluses and passive styluses based on whether they contain an internal battery and electronic components.

[0004] Compared to active styluses, passive styluses have the advantages of lower price and no need for batteries, but they also have the disadvantage of difficulty in precise touch recognition. However, recently, electromagnetic resonance (EMR) has been used to achieve passive styluses capable of precise touch recognition.

[0005] Figure 1a is a simplified schematic diagram of the inductor section 10 of a conventional EMR stylus and the external magnetic body 20 that affects the inductor section 10. Figure 1b is a schematic diagram illustrating how the resonant frequency of the resonant circuit section of a conventional EMR stylus changes due to the external magnetic body 20 shown in Figure 1a.

[0006] Referring to Figure 1a, the existing EMR stylus has a resonant circuit section (not shown) consisting of a capacitor section (not shown) and an inductor section 10.

[0007] As shown in Figure 1a, the inductor section 10 consists of a ferrite core 11 and a coil 13 wound around the outside of the ferrite core to form a magnetic field. The existing ferrite core 11 is made of nickel-manganese (Ni-Mn) series material.

[0008] The inductor section 10 is magnetized by the surrounding magnetic body 20. Specifically, the characteristics of the ferrite core 11 are changed by the external magnetic body 20, and the inductance of the inductor section 10 changes.

[0009] As shown in Figure 1b, the change in inductance causes the resonant frequency of the resonant circuit to shift, and this change in resonant frequency leads to a decrease in the performance of the input system.

[0010] Korean Patent Publication No. 10-2024-0054830 (hereinafter referred to as Patent Document 1) discloses a foldable electronic device 1. A first magnetic body 61 and a second magnetic body 62 are disposed at the edge portions of a first frame 111 and a second frame 111 inside the foldable electronic device 1. In the folded state of the foldable electronic device 1, the first magnetic body 61 and the second magnetic body 62 overlap each other, and the attraction between them reduces the separation between the first housing 11 and the second housing 12. When the inductor section 10 shown in FIG. 1a is located near the first magnetic body 61 and the second magnetic body 62, the ferrite core of the inductor section 10 is magnetized, thereby causing a change in the resonant frequency.

[0011] On the other hand, everyday items and the environment also contain magnetic objects such as laptops, scissors, smartwatches, and tweezers, which can magnetize the inductor of a stylus.

[0012] Existing technical documents

[0013] Patent documents

[0014] (Patent Document 1) KR 10-2024-0054830 A1. Summary of the Invention

[0015] Technical problems to be solved:

[0016] The technical problem to be solved by the present invention is to provide a ferrite core that can improve the magnetization effect caused by an external magnetic body and a stylus including the same.

[0017] Technical solution:

[0018] According to an embodiment of the present invention, the ferrite core is a ferrite core disposed inside a stylus, the ferrite core comprising 60% to 80% by weight of iron (Fe), 15% to 30% by weight of manganese (Mn), and 3% to 20% by weight of zinc (Zn).

[0019] A stylus according to an embodiment of the present invention includes: a housing; a core configured such that one end is disposed outside the housing and the remainder is disposed inside the housing, and is movable along its length by an external force acting on the one end; an inductor portion disposed inside the housing, including a ferrite core having a through hole through the core and a coil wound around the outside of the ferrite core; a fixed bracket fixedly disposed inside the housing and coupled to the other end of the ferrite core; and a movable bracket disposed inside the fixed bracket, configured to surround the other end of the core and linked with the core and synchronized with the movement of the core, wherein the ferrite core comprises 60% to 80% by weight of iron (Fe), 15% to 30% by weight of manganese (Mn), and 3% to 20% by weight of zinc (Zn).

[0020] The effects of the invention:

[0021] When using a ferrite core according to an embodiment of the present invention and a stylus including the same, it has the advantage of being able to reduce the magnetization effect caused by an external magnetic material. Furthermore, the variation of the resonant frequency of the resonant circuit can be minimized, thereby preventing the performance degradation of the input system. Simple Explanation of the Diagram

[0022] Figure 1a is a simplified schematic diagram of the inductor section 10 of a conventional EMR stylus and the external magnetic body 20 that affects the inductor section 10. Figure 1b is a schematic diagram illustrating how the resonant frequency of the resonant circuit section of a conventional EMR stylus varies with the external magnet 20 shown in Figure 1a. Figure 2 is a coordinate diagram showing the changes in resonant frequency due to magnetization of an EMR stylus pen with a ferrite core according to an embodiment of the present invention (hereinafter referred to as the embodiment stylus pen) and an EMR stylus pen with a conventional ferrite core (hereinafter referred to as the conventional stylus pen). Figure 3 is a perspective view of a stylus 100 according to an embodiment of the present invention. Figure 4 is a cross-sectional view of part A of the stylus 100 shown in Figure 3. Figure 5 is a detailed cross-sectional view of the inductor section 120 shown in Figure 4. Figures 6(a) to (b) are schematic diagrams illustrating the internal structure and effects of the stylus according to an embodiment of the present invention, as shown in Figures 4 to 5. Figures 7(a) to (c) are schematic diagrams illustrating in more detail the internal structure and effects of the stylus according to an embodiment of the present invention shown in Figures 4 and 5. Figure 8 is a schematic diagram illustrating the magnitude increase of the pen signal at a predetermined height S according to Figures 7(a) to (c). Figure 9 is a perspective view of a modified example of the ferrite core 121 shown in Figures 4 and 5. Figure 10(a) is an enlarged front view of a portion of the ferrite core 121' shown in Figure 9, and Figure 10(b) is a cross-sectional view along A-A' of Figure 10(a). Figure 11 is a cross-sectional view of a stylus using another variation of the ferrite core 121 shown in Figure 4. Figure 12 is a cross-sectional view showing only the ferrite core 121'' and coil section 123 shown in Figure 11. Figure 13 is a perspective view of the ferrite core 121'' shown in Figures 11 and 12. Figure 14(a) is an enlarged front view of a portion of the ferrite core 121'' shown in Figure 13, and Figure 14(b) is a cross-sectional view along B-B' of Figure 14(a). Figure 15 is a perspective view of a stylus 1000 according to another embodiment of the present invention. Figure 16 is a cross-sectional view of a portion of the stylus 1000 shown in Figure 15. Figure 17 is a perspective view of the housing 1010 of the stylus 1000 shown in Figure 15 after removing it. Figure 18 is a perspective view of the fixed bracket 1600 shown in Figure 17 only. Figure 19 is a perspective view of the fixed bracket 1600 shown in Figure 18 from another direction. Figure 20 is a portion of the three-dimensional view of Figure 17 viewed from another direction. Figure 21 is a perspective view of the inductor section 1200 and the mounting bracket 1600 shown in Figure 17, excluding them. Figure 22 is a three-dimensional view of Figure 21 viewed from another direction. Figure 23 is a cross-sectional view of Figure 21. Figure 24 is a perspective view of the elastic component 1800 shown only in Figure 21. Figure 25 is a perspective view of the substrate support 1900 and substrate 2100 shown in Figure 21. Figure 26 is a schematic diagram illustrating the movement of the movable support 1300 and the electrical contact and release between the fixed support 1600 and the movable support 1300, as shown in Figures 17 to 25, of the core 1020. Figure 27 is a diagram illustrating (A) and (B) of Figure 26 respectively. Figure 28 simplifies the stylus according to another embodiment of the present invention, with equivalent circuit diagrams constructed for (A) and (B) of Figure 26 respectively. Figure 29 is a perspective view of the stylus 1000 shown in Figure 15 according to another embodiment of the present invention, viewed from the side of the core 1020. Figure 30(A) is a portion of a cross-sectional view of the stylus 1000 shown in Figure 29 cut along line A-A'. Figure 30(B) is a portion of a cross-sectional view of the stylus 1000 shown in Figure 29 cut along line B-B'. Figure 31 is a schematic diagram showing a side view (A), (B) and a cross-sectional view of the ferrite core 1210 shown in Figures 29 and 30. Figure 32 is a schematic diagram illustrating a modified example of the ferrite core 1210 shown in Figure 31. Figure 33 is a perspective view of the inductor section 1200' with the coil 1230' wound around the ferrite core 1210' shown in Figure 32. Implementation

[0023] The detailed description of the invention described below refers to the accompanying drawings, which illustrate specific embodiments in which the invention may be practiced. These embodiments are described in detail to enable those skilled in the art to practice them. It should be understood that the various embodiments of the invention differ from one another but are not mutually exclusive. For example, specific shapes, structures, and characteristics described herein may be implemented in other embodiments without departing from the spirit and scope of one embodiment of the invention. Furthermore, it should be understood that the position or arrangement of individual elements in the various disclosed embodiments may be changed without departing from the spirit and scope of the invention. Therefore, the detailed description below is not intended to be limiting, and the scope of the invention, if properly described, is limited only to all scopes equivalent to those claimed in the claims and the appended claims. Similar reference numerals in the figures denote the same or similar functions in several respects.

[0024] According to one embodiment of the present invention, the ferrite core is configured to improve the magnetization effect caused by an external magnetic material.

[0025] Specifically, the ferrite core according to one embodiment of the present invention can have various shapes. For example, it can have a cylindrical shape as shown in FIG1. ​​Additionally, it can have the shape of the ferrite core inside a stylus according to various embodiments described later. The shape of the ferrite core according to one embodiment of the present invention is not limited to a specific shape.

[0026] According to one embodiment of the present invention, the ferrite core comprises iron (Fe), manganese (Mn) and zinc (Zn).

[0027] The ferrite core comprises 60% to 80% by weight of iron (Fe), 15% to 30% by weight of manganese (Mn), and 3% to 20% by weight of zinc (Zn). Preferably, the ferrite core may consist of 70% by weight of iron (Fe), 18% by weight of manganese (Mn), and 12% by weight of zinc (Zn).

[0028] The ferrite core can be formed from iron (Fe), manganese (Mn) and zinc (Zn) having the above-mentioned composition range at a firing temperature of 800°C to 1800°C.

[0029] Figure 2 is a coordinate diagram showing the changes in resonant frequency due to magnetization of an EMR stylus pen with a ferrite core according to an embodiment of the present invention (hereinafter referred to as the embodiment stylus pen) and an EMR stylus pen with a conventional ferrite core (hereinafter referred to as the conventional stylus pen).

[0030] The coordinate diagram in Figure 2 was performed under the same conditions as the styluses in the embodiments and existing styluses, except for the ferrite core. The styluses of the three embodiments and three existing styluses were forcibly magnetized using the external magnetic body 20 shown in Figure 1a. In the coordinate diagram of Figure 2, the horizontal axis is time (seconds) and the vertical axis is the resonant frequency (Hz).

[0031] Referring to Figure 2, for the styluses of the three embodiments, it can be confirmed that despite forced magnetization, the change in resonant frequency is relatively small and remains almost constant regardless of time. In contrast, for the three existing styluses, it can be confirmed that the resonant frequency of each existing stylus differs at each time, and the magnetization trends are also different.

[0032] The above results confirm that one or more of the material, composition ratio, and firing temperature of the ferrite core according to the embodiments of the present invention improve the magnetization effect and hardly causes a change in the resonant frequency caused by magnetization.

[0033] The following description, with reference to the accompanying drawings, illustrates a stylus comprising a ferrite core according to the embodiments of the present invention described above.

[0034] Figure 3 is a perspective view of a stylus 100 including a ferrite core according to an embodiment of the present invention.

[0035] Referring to Figure 3, a stylus 100 including a ferrite core according to an embodiment of the present invention includes a housing 101, a core 102, and a ferrite core (not shown) disposed inside the housing 101.

[0036] The housing 101 forms the shape of the stylus 100. The housing 101 has a predetermined space inside and has an elongated shape in one direction. The housing 101 can be formed by combining two or more parts together, or it can be formed as a single piece.

[0037] The housing 101 may be made of a non-conductive synthetic resin material.

[0038] The housing 101 may include a first housing 101a and a second housing 101b. The first housing 101a and the second housing 101b may be combined with each other to form the shape of the stylus 100. Various components are built inside the first housing 101a and the second housing 101b.

[0039] A button portion 109 may be disposed on the housing 101. The button portion 109 may be disposed on the outer side of the middle of the second housing 101b. The button portion 109 may be for performing a specific operation of the stylus 100. For example, it may be a mechanical or contact button for canceling an operation.

[0040] The core 102 includes one end disposed outside the housing 101, and the remaining portion other than said one end disposed inside the housing 101. Here, the one end of the core 102 may also be named the pen tip.

[0041] A portion of one end of the core 102 can be moved into the housing 101 by an external force. As the external force increases, the volume of the portion of the core 102 inside the housing 101 can increase. When the applied external force decreases, the portion of one end of the core 102 re-enters the housing 101 through mechanical operation of components inside the housing 101. When the external force disappears, the portion of one end of the core 102 returns to its initial state.

[0042] The internal structure of the housing 101 will be described below with reference to Figures 4 and 5.

[0043] Figure 4 is a cross-sectional view of part A of the stylus 100 shown in Figure 3, and Figure 5 is a detailed cross-sectional view of the inductor section 120 shown in Figure 4.

[0044] Referring to Figures 4 and 5, a stylus 100 according to one embodiment of the present invention includes a buffer member 115, an inductor portion 120, and a capacitor portion (not shown) disposed inside a housing 101.

[0045] A buffer member 115 is disposed inside the housing 101, and between one end of the ferrite core 121 and the inner surface of the housing 101. The buffer member 115 may be disposed inside the tapered portion 101t of the housing 101. Here, the tapered portion 101t of the housing 101 is the portion of the two ends of the housing 101 adjacent to one end of the core 102, and has a shape in which its width or diameter decreases as it approaches one end of the housing 101.

[0046] The buffer member 115 has a conical or pyramidal shape and a through hole that extends through one end of the ferrite core 121 and the body 102a of the core 102. The inner surface of the through hole can have a shape corresponding to the outer surface of one end of the ferrite core 121 and the outer surface of the body 102a of the core 102. Here, the body 102a of the core 102 refers to the portion of the core 102 that is elongated in one direction and disposed within the through hole of the ferrite core 121.

[0047] The buffer component 115 can be made of an elastic material such as rubber to act as a buffer between the ferrite core 121 and the housing 101. This buffer component 115 can protect the housing 101 or the ferrite core 121, or it can block the impact of mechanical shocks from the outside.

[0048] The buffer member 115 has a shape that surrounds one end of the ferrite core 121 or the lower section 121b of the ferrite core 121.

[0049] The virtual tangent L1, which contacts both the tapered portion 101t of the housing 101 and a portion (or pen tip) disposed outside the housing 101 in the core 102, forms a predetermined angle θ with the central axis Y of the core 102. Preferably, the predetermined angle θ is within 30°. When the predetermined angle θ is within 30°, the stylus according to one embodiment of the present invention can draw even when tilted at 60° to the contact surface.

[0050] The inductor section 120 can be combined with the capacitor section (not shown) to form an LC resonant section. The resonant frequency can be set by the inductance (L) value of the inductor section 120 and the capacitance (C) value of the capacitor section (not shown). The resonant frequency can vary according to the change in the inductance (L) value of the inductor section 120 or the capacitance (C) value of the capacitor section (not shown).

[0051] The inductor section 120 includes a ferrite core 121 and a coil section 123 wound around the ferrite core 121.

[0052] The coil portion 123 may be wound with at least one layer on the ferrite core 121.

[0053] The ferrite core 121 can have a cylindrical or polygonal shape as a whole, and can have a through hole 121h that extends through the interior along the length of the ferrite core 121.

[0054] Ferrite core 121 contains iron (Fe), manganese (Mn) and zinc (Zn).

[0055] The ferrite core 121 comprises 60% to 80% by weight of iron (Fe), 15% to 30% by weight of manganese (Mn), and 3% to 20% by weight of zinc (Zn). Preferably, the ferrite core 121 may be composed of 70% by weight of iron (Fe), 18% by weight of manganese (Mn), and 12% by weight of zinc (Zn).

[0056] The ferrite core 121 can be formed from iron (Fe), manganese (Fe) and zinc (Zn) having the above composition range at a firing temperature of 800°C to 1800°C.

[0057] By adjusting one or more of the material, composition ratio, and firing temperature of the ferrite core 121, as shown in Figure 2, the magnetization effect can be improved even when magnetized by an external magnetic material, thus achieving the advantage that the resonant frequency of the LC resonant section remains almost unchanged.

[0058] The ferrite core 121 has a through hole 121h through which the main body 102a of the core 102 passes. Through the through hole 121h, the main body 102a of the core 102 can reciprocate linearly along its length.

[0059] One end of the ferrite core 121 may have a tapered shape in which the diameter or width decreases towards the end. Here, the outer side of the tapered end may include at least one inwardly curved surface 121c.

[0060] The ferrite core 121 may include an upper section 121a and a lower section 121b disposed below the upper section 121a. Here, the upper section 121a and the lower section 121b may be integrally formed.

[0061] The upper section 121a has the shape of a cylinder, an elliptical cylinder, or a polygonal prism. Here, the diameter or width of the cylinder or the polygonal prism can be constant as shown in the figure. Alternatively, the diameter or width of the cylinder, the elliptical cylinder, or the polygonal prism can be non-constant, with one part having a different diameter or width than other parts.

[0062] The upper section 121a has a portion of a through hole 121h through which the main body 102a of the core 102 is formed. The coil section 123 is disposed on the outside of the upper section 121a.

[0063] The lower section 121b is the remaining part of the body 102a through which the core 102 is formed.

[0064] The lower segment 121b has a tapered shape that tapers in width from top to bottom, and at least a portion of the outer side of the lower segment 121b has a curved surface 121c that curves inward toward the lower segment 121b. At least one curved surface 121c may be present. The technical effects of a stylus according to an embodiment of the present invention, including a ferrite core 121 having such a curved surface 121c, will be described below with reference to the accompanying drawings.

[0065] Figures 6(a) to (b) are schematic diagrams illustrating the internal structure and effects of the stylus according to an embodiment of the present invention shown in Figures 4 and 5. Specifically, Figure 6(b) is a cross-sectional view of the stylus according to an embodiment of the present invention shown in Figures 4 and 5, and Figure 6(a) is a cross-sectional view replacing the ferrite core 121 in Figure 6(b) with the ferrite core 131' shown on the right side of Figure 2.

[0066] Referring to Figures 6(a) to (b), the stylus shown in Figure 6(b) according to an embodiment of the present invention can be configured with the ferrite core 121 positioned a predetermined length S lower than the ferrite core 131' shown in Figure 6(a).

[0067] With this configuration, when using the stylus according to an embodiment of the present invention, the inductor portion 120 including the ferrite core 121 can be positioned closer to the receiver side (not shown) located below the core 102 of the stylus. Therefore, it has the advantage of increasing the magnitude of the pen signal sensed at the receiver side. This is possible because the thickness of the buffer member 115 (between the inner and outer surfaces) can be reduced by shaping the ferrite core 121 of the stylus according to an embodiment of the present invention. Hereinafter, a detailed description will be provided with reference to FIG7.

[0068] Figures 7(a) to (c) are schematic diagrams illustrating in more detail the internal structure and effects of the stylus according to an embodiment of the present invention shown in Figures 4 and 5. Specifically, Figure 7(a) is the same as Figure 6(a), Figure 7(b) is the same as Figure 6(b), and Figure 7(c) shows the case where the ferrite core 121 is arranged in the same position as the ferrite core 131' in Figure 7(a).

[0069] Referring to Figure 7(a), the buffer member 115' has a certain thickness T2 between its inner and outer surfaces. The more the thickness T2 is minimized, the more the ferrite core 131' can be positioned downwards within the tapered portion 101t of the housing 101. However, due to the structure of the buffer member 115' or other manufacturing process reasons, the thickness T2 is limited.

[0070] Here, if we assume that the thickness T2 is the minimum thickness that the buffer component 115' can have due to the structure of the buffer component 115' or other manufacturing process reasons, then the case in which the existing ferrite core 131' is arranged in the lowest section within the housing 101 is as shown in Figure 7(a).

[0071] Referring to (c) of FIG. 7, the ferrite core 121 is disposed at the same position as the ferrite core 131' in (a) of FIG. 7. However, since the ferrite core 121 has a curved surface portion 121c, accordingly, there are structural differences between the buffer member 115'' and the buffer member 115' shown in (a) of FIG. 7. Specifically, the inner surface of the buffer member 115'' has a curved surface that protrudes outward corresponding to the curved surface portion 121c of the ferrite core 121.

[0072] The thickness between the outer surface and the inner surface formed by the curved surface of the buffer member 115'' varies according to the position. Specifically, the upper and lower portions of the inner surface of the buffer member 115'' have a minimum thickness T2 from the outer surface, and the middle portion of the inner surface of the buffer member 115'' has a thickness between T2 and T1 (>T2).

[0073] In (c) of FIG. 7, at least a part (upper and lower portions) of the buffer member 115'' satisfies the minimum thickness T2, and the thickness of the middle portion of the buffer member 115'' has a thickness T1 greater than the minimum thickness T2. As described above, since the thickness T1 of the middle portion of the buffer member 115'' is thicker than T2, in terms of manufacturing the buffer member 115'', it has the advantage of being easier to manufacture than the existing buffer member 115' in (a) of FIG. 7.

[0074] Referring to (b) of FIG. 7, the inner surface of the buffer member 115 forms a curved surface due to the curved surface portion 121c of the ferrite core 121. The upper and lower portions of the inner surface of the buffer member as the buffer member 115 has a thickness T3 (<T2), and the middle portion of the inner surface of the buffer member 115 has a thickness between T3 and T2 with respect to the outer surface of the buffer member 115.

[0075] In (b) of FIG. 7, although the upper and lower portions of the buffer member 11115 do not satisfy the minimum thickness T2, the middle portion of the buffer member satisfies the minimum thickness T2, so the buffer member 115 can be manufactured. Since the buffer member 115 manufactured in this way has a thinner minimum thickness compared to the buffer members 115' and 115'' shown in (a) and (c) of FIG. 7, the volume of the buffer member 115 can be further reduced. Therefore, the buffer member 115 can be disposed more downward inside the conical portion 101t of the housing 101, and thus the ferrite core 121 can be disposed more downward by a predetermined height S compared to (a) or (c) of FIG. 7.

[0076] FIG. 8 is a schematic diagram for explaining the amount of increase in the size of the pen signal according to the predetermined height S shown in (a) to (c) of FIG. 7.

[0077] Referring to the table shown in Figure 8, it can be confirmed that as the predetermined height S increases, the magnitude of the pen signal received by the receiver increases.

[0078] As described above, the stylus 100 according to an embodiment of the present invention shown in Figures 4 to 7 has a different shape for the tapered portion of the ferrite core 121 in the inductor section 120 compared to the conventional ferrite core 131'. Therefore, the thickness of the buffer member 115 can be further reduced, allowing the ferrite core 121 to be positioned closer to the end of the core 102 inside the housing 101. Consequently, the receiver side receiving the pen signal emitted from the stylus 100 according to an embodiment of the present invention can obtain a larger pen signal, thereby improving the sensing sensitivity of the stylus at the receiver side.

[0079] On the other hand, the receiver mentioned several times above refers to a module or device that receives pen signals emitted from a stylus 100 according to an embodiment of the present invention. The receiver can be a general digitizer or a display panel. The display panel can have at least one annular pattern of a conductive material. The annular pattern can be coupled to a touch sensor or coupled to the display panel independently of the touch sensor.

[0080] Figure 9 is a perspective view of a modified example of the ferrite core 121 shown in Figures 4 and 5. Figure 10(a) is an enlarged front view of a portion of the ferrite core 121' shown in Figure 9. Figure 10(b) is a cross-sectional view along A-A' of Figure 10(a).

[0081] Referring to Figures 9 and 10, the ferrite core 121' has a cylindrical shape. At least a portion of the outer surface of the ferrite core 121' may be provided with a planar portion 121d. Another portion of the outer surface of the ferrite core 121' may also be provided with a planar portion corresponding to the planar portion 121d. Through the planar portion 121d, the ferrite core 121' can be stably disposed inside the housing.

[0082] The ferrite core 121' has a cylindrical upper section 121a' and a lower section 121b', and the lower section 121b' may have at least two curved surfaces 121c'. The curved surfaces 121c' may be portions that curve from the outside of the lower section 121b' to the portion adjacent to the through hole 121h of the ferrite core 121'. These curved surfaces 121c' may be respectively provided on opposite sides of the lower section 121b' with reference to the through hole 121h.

[0083] The curved surface 121c of the ferrite core 121 shown in Figures 4 and 5 can be disposed on the entire outside of the lower section 121b', but the curved surface 121c' of the ferrite core 121' shown in Figures 9 and 10 can be disposed on a portion of the outside of the lower section 121b'.

[0084] The planar portion 121d can be respectively provided in the upper section 121a' and the lower section 121b', and they can be connected to each other to be continuously provided. Here, the planar portion 121d provided in the lower section 121b' can be provided between two curved surfaces 121c' that are provided opposite to each other on the outside of the lower section 121b'.

[0085] The ferrite core 121' shown in Figures 9 and 10 can be alternatively applied to the stylus shown in Figures 9 to 26. In this case, the buffer member (not shown) can have a shape that covers a portion of the lower section 121b' of the ferrite core 121'.

[0086] Figure 11 is a cross-sectional view of a stylus using another variation of the ferrite core 121 shown in Figure 4. Figure 12 is a cross-sectional view showing only the ferrite core 121'' and coil portion 123 shown in Figure 11. Figure 13 is a perspective view of the ferrite core 121'' shown in Figures 11 and 12. Figure 14(a) is an enlarged front view of a portion of the ferrite core 121'' shown in Figure 13. Figure 14(b) is a cross-sectional view along B-B' of Figure 14(a).

[0087] Referring to Figures 11 to 13, the ferrite core 121'' according to another variation includes an upper section 121a'' and a lower section 121b''.

[0088] The lower segment 121b'' has a tapered shape, and the outer side of the lower segment 121b'' includes at least one step portion 121c''.

[0089] The step difference 121c'' can be set outside the entire lower step 121b'', or it can be set in one (or more) parts of the outside, as shown in Figures 13 and 14.

[0090] The step portion 121c'' may include a first surface 121c1, a second surface 121c2 connected to the first surface 121c1, and a third surface 121c3 connected to the second surface 121c2. The first surface 121c1 may be a surface perpendicular to the through-hole 121h, and the third surface 121c3 may be a surface parallel to the through-hole 121h. The second surface 121c2 may connect the first surface 121c1 and the third surface 121c3. Although not shown in a separate figure, the second surface 121c2 may also be a curved surface that curves inward or outward.

[0091] The ferrite core 121'' has a cylindrical shape. At least a portion of the outer surface of the ferrite core 121'' may have a planar portion 121d. Another portion of the outer surface of the ferrite core 121'' may also have a planar portion corresponding to the planar portion 121d. Through the planar portion 121d, the ferrite core 121'' can be stably disposed inside the housing.

[0092] The planar portion 121d can be respectively provided in the upper section 121a'' and the lower section 121b'', and they can be connected to each other to be continuously provided. Here, the planar portion 121d provided in the lower section 121b'' can be provided between two step portions 121c'' which are provided opposite to each other on the outside of the lower section 121b''.

[0093] Since the ferrite core 121'' shown in Figures 11 to 14 includes a step portion 121c'', it can have almost the same or similar effects as the ferrite core 121 shown in Figures 4 to 5.

[0094] The ferrite core 121'' shown in Figures 11 to 14 can also be used alternatively with the stylus shown in Figures 9 to 26. In this case, the buffer member (not shown) can have a shape that covers a portion of the lower section 121b'' of the ferrite core 121''.

[0095] The following description, with reference to the accompanying drawings, details the structure of the stylus to which the ferrite cores 121, 121', 121'' can be applied according to the various embodiments shown in Figures 4 to 14.

[0096] FIG15 is a perspective view of a stylus 1000 according to another embodiment of the present invention, FIG16 is a cross-sectional view of a portion of the stylus 1000 shown in FIG15, and FIG17 is a perspective view of the stylus 1000 shown in FIG15 with the housing 1010 removed.

[0097] Referring to Figures 15 to 17, the housing 1010 forms the shape of the stylus 1000. The interior of the housing 1010 has a predetermined space and is elongated in one direction. The housing 1010 can be formed by combining two or more parts together, or it can be formed as a single piece.

[0098] The housing 1010 may be made of a non-conductive synthetic resin material.

[0099] A button portion 1090 may be configured on the housing 1010. The button portion 1090 may be for performing specific operations of the stylus 1000. For example, it may be a button for canceling an operation or performing a special function operation.

[0100] The core 1020 includes one end disposed outside the housing 1010, and the remaining portion other than said end is disposed inside the housing 1010. Here, the one end of the core 102 can also be named pen tip.

[0101] The core 1020 can be made of a non-conductive material.

[0102] The core 1020 may include a base 1021 and an outer contour 1025. The base 1021 has a shape that extends elongated along the length of the stylus 1000. The outer contour 1025 surrounds the side of the base 1021. One end of the base 1021 is exposed to the outside and is not covered by the outer contour 1025. The outer contour 1025 is made of a material that is relatively harder than the material of the base 1021 to reinforce and protect the base 1021.

[0103] A portion of one end of the core 1020 can move into the housing 1010 under the influence of an external force. As the external force increases, the volume of the portion of the core 1020 inside the housing 1010 increases. When the applied external force decreases, the portion of one end of the core 1020 re-emerges outside the housing 1010. When the external force disappears, the portion of one end of the core 1020 returns to its initial state.

[0104] The buffer member 1150 is disposed inside the housing 1010, and is disposed between one end of the ferrite core 1210 and the inner surface of the housing 1010. The buffer member 1150 may be disposed inside the tapered portion 1010t of the housing 1010. Here, the tapered portion 1010t of the housing 1010 is the portion of the two ends of the housing 1010 adjacent to one end of the core 1020, and has a shape in which its width or diameter becomes thinner towards the end of one end of the housing 1010.

[0105] The buffer member 1150 has a conical or pyramidal shape and a through hole extending through the main body portion between one end of the ferrite core 1210 and one end and the other end of the core 1020. The inner surface of the through hole can have a shape corresponding to the outer surface of one end of the ferrite core 1210 and the outer surface of the main body portion of the core 1020. Here, the main body portion of the core 1020 refers to the portion of the core 1020, which is elongated in one direction, disposed within the through hole of the ferrite core 1210.

[0106] The buffer component 1150 may be made of an elastic material such as rubber to act as a buffer between the ferrite core 1210 and the housing 1010. This buffer component 1150 can block external electrical or magnetic influences.

[0107] The buffer component 1150 has a shape that surrounds one end of the ferrite core 1210.

[0108] The virtual tangent that comes into common contact between the tapered portion 1010t of the housing 1010 and a portion (or pen tip) disposed outside the housing 1010 in the core 1020 can form a predetermined angle as shown in FIG4. Here, preferably, the predetermined angle is within 30°. When the predetermined angle is within 30°, the stylus according to another embodiment of the present invention has the advantage that it can draw even when tilted at 60° to the contact surface.

[0109] The inductor section 1200 can form an LC resonant section with the capacitor section (not shown). The resonant frequency can be set by the inductance (L) value of the inductor section 1200 and the capacitance (C) value of the capacitor section (not shown). The resonant frequency can vary according to the change in the inductance (L) value of the inductor section 1200 and / or the capacitance (C) value of the capacitor section (not shown).

[0110] The inductor section 1200 includes a ferrite core 1210 and a coil section 1230 wound around the outside of the ferrite core 1210.

[0111] The ferrite core 1210 can have the shape of a cylinder, elliptical cylinder or polygonal prism, and can have a through hole 1210h that runs through the interior along the length of the ferrite core 1210.

[0112] The ferrite core 1210 can be used in place of the ferrite cores 121, 121', 121'' of the various embodiments shown in Figures 4 to 14.

[0113] Ferrite core 1210 contains iron (Fe), manganese (Mn) and zinc (Zn).

[0114] The ferrite core 1210 comprises 60% to 80% by weight of iron (Fe), 15% to 30% by weight of manganese (Mn), and 3% to 20% by weight of zinc (Zn). Preferably, the ferrite core 1210 may be composed of 70% by weight of iron (Fe), 18% by weight of manganese (Mn), and 12% by weight of zinc (Zn).

[0115] The ferrite core 1210 can be formed from iron (Fe), manganese (Mn) and zinc (Zn) having the above-mentioned composition range at a firing temperature of 800°C to 1800°C.

[0116] By adjusting one or more of the material, composition ratio, and firing temperature of the ferrite core 1210, as shown in Figure 2, the magnetization effect can be improved even when magnetized by an external magnetic material, thus achieving the advantage that the resonant frequency of the LC resonant section remains almost unchanged.

[0117] The ferrite core 1210 has a through hole 1210h through which the main body of the core 1020 passes. Through the through hole 1210h, the main body of the core 1020 can reciprocate linearly along its length.

[0118] One end of the ferrite core 1210 may have a tapered shape in which the diameter or width decreases towards the end. Here, the outer side of the tapered end may include at least one inwardly curved surface 121c as shown in FIG5.

[0119] As shown in Figure 5, the ferrite core 1210 may include an upper section 121a and a lower section 121b disposed below the upper section 121a. Here, the upper section 121a and the lower section 121b may be integrally formed.

[0120] The coil section 1230 may be wound with at least one layer on the ferrite core 1230.

[0121] The coil portion 1230 is electrically connected to the substrate 2100. The coil portion 1230 may include a first connecting portion 1231 and a second connecting portion 1232 for connection to the substrate 2100. The first connecting portion 1231 is disposed on the fixing bracket 1600, and its end is electrically connected to a first terminal portion 2131 of the substrate 2100. The second connecting portion 1232 is disposed on the fixing bracket 1600, and its end is electrically connected to a second terminal portion 2132 of the substrate 2100. Here, the fixing bracket 1600 may have grooves for respectively arranging the first connecting portion 1231 and the second connecting portion 1232. These grooves may be formed on the outside of the fixing bracket 1600 along the length direction of the stylus 1000. This has the advantage of allowing the first connecting portion 1231 and the second connecting portion 1232 of the coil portion 1230 to be guided through the grooves, and protecting the first connecting portion 1231 and the second connecting portion 1232 from external impacts.

[0122] Figure 18 is a perspective view of the fixed bracket 1600 shown in Figure 17 only. Figure 19 is a perspective view of the fixed bracket 1600 shown in Figure 18 from another direction. Figure 20 is a portion of the perspective view of Figure 17 from another direction.

[0123] Referring to Figures 17 to 20, the mounting bracket 1600 is fixedly disposed inside the housing 1010. The mounting bracket 1600 can be disposed inside the housing 1010 between the inductor section 1200 and the substrate support 1900. One end of the mounting bracket 1600 is coupled to the inductor section 1200, and the other end of the mounting bracket 1600 can be coupled to the substrate support 1900.

[0124] One end of the mounting bracket 1600 may include an insertion slot 1620 into which the other end of the ferrite core 1210 of the power inductor section 1200 is inserted. The insertion slot 1620 may be formed by a first partition wall 1611 and an inner side wall 1622 of the mounting bracket 1600.

[0125] The first partition wall 1611 can contact the other end of the ferrite core 1210, and the first partition wall 1611 has a through hole 1610 through which the core 1020 passes.

[0126] The inner wall 1622 may include a plurality of protrusions 1621 extending into the insertion slot 1620. The plurality of protrusions 1621 contact the outside of the other end of the ferrite core 1210, thereby serving to position the ferrite core 1210.

[0127] The other end of the fixing bracket 1600 may include mounting holes 1660 and 1665 into which the mounting portions 1960 and 1965 of the substrate bracket 1900 are inserted. At least one mounting hole 1660 or 1665 may be provided, as shown in the figure, with one on the upper side and one on the lower side of the fixing bracket 1600. The fixing bracket 1600 can be attached to the substrate bracket 1900 by connecting the mounting portion 1960 of the substrate bracket 1900 to the mounting hole 1660.

[0128] The other end of the mounting bracket 1600 may include a guide protrusion 1667. The guide protrusion 1667 may extend along the length direction of the mounting bracket 1600. The guide protrusion 1667 may engage with the guide portion 1967 of the substrate bracket 1900. By engaging the guide protrusion 1667 with the guide portion 1967 of the substrate bracket 1900, the mounting bracket 1600 can be configured along the length direction of the stylus 1000.

[0129] The other end of the fixing bracket 1600 may include a second partition wall 1680. The second partition wall 1680, together with the substrate bracket 1900, fixes the position of the elastic member 1800. That is, the elastic member 1800 can be fixedly disposed between the second partition wall 1680 and the substrate bracket 1900.

[0130] The fixed bracket 1600 is configured to surround the movable bracket 1300, the elastic body 1700, and the elastic component 1800. The fixed bracket 1600 may have an internal storage space 1640 for housing the movable bracket 1300, the elastic body 1700, and the elastic component 1800. Within the storage space 1640 of the fixed bracket 1600, the movable bracket 1300 can perform linear reciprocating motion.

[0131] The mounting bracket 1600 may include two or more electrode patterns 1690. At least two electrode patterns 1690 may be disposed on the outer surface of the mounting bracket 1600. For example, the electrode patterns 1690 may be disposed on the outer surfaces of both sides of the mounting bracket 1600. The electrode patterns 1690 may be plated onto the outer surface of the non-conductive mounting bracket 1600. For example, the electrode patterns 1690 may be formed on the outer surface of the non-conductive mounting bracket 1600 by laser direct structuring (LDS) and laser manufacturing antenna (LMA).

[0132] A groove (or cavity) corresponding to the shape of the electrode pattern 1690 may be formed on the outer surface of the fixing bracket 1600. The electrode pattern 1690 may be plated inside the groove (or cavity). Although not shown in a separate figure, as another embodiment, a protrusion corresponding to the shape of the electrode pattern 1690 may be formed on the outer surface of the fixing bracket 1600, and the electrode pattern 1690 may be plated on the protrusion.

[0133] The electrode pattern 1690 can be set around the guide hole 1630 of the fixing bracket 1600, and can have a concave-convex shape or a " The electrode pattern 1690 is in the shape of a "". One end of the electrode pattern 1690 can be in contact with or spaced apart from the electrode pattern 1390 of the movable bracket 1300 by a predetermined interval, and the other end of the electrode pattern 1690 can be electrically connected to the terminal portions 2191 and 2192 of the substrate 2100.

[0134] As the movable support 1300 moves in sync with the movement of the core 1020, the electrode pattern 1690 can either contact the electrode pattern 1390 of the movable support 1300 or be positioned at a predetermined distance from the electrode pattern 1390 of the movable support 1300. This will be explained in further detail with reference to other figures.

[0135] Figure 21 is a perspective view of Figure 21 after removing the inductor section 1200 and the mounting bracket 1600 shown in Figure 17. Figure 22 is a perspective view of Figure 21 from another direction. Figure 23 is a cross-sectional view of Figure 21.

[0136] Referring to Figures 16 to 21, the movable support 1300 moves synchronously with the core 1020. When one end of the core 1020 is subjected to an external force, the core 1020 moves toward the inside of the housing 1010, and the movable support 1300 moves together with the core 1020.

[0137] The movable bracket 1300 is configured to house the other end of the core 1020, the magnetic body 1400, and the protective component 1500. The movable bracket 1300 may have a housing portion for housing the other end of the core 1020, the magnetic body 1400, and the protective component 1500.

[0138] Inside the storage section, the magnetic body 1400 and the protective member 1500 are configured to surround the other end of the core 1020. For this purpose, the magnetic body 1400 is cylindrical and may have a through portion extending through the other end of the core 1020 inside, and the protective member 1500 is cylindrical and may have a through portion extending through the other end of the core 1020 inside.

[0139] The magnetic body 1400 contains a magnetic material and moves synchronously with the core 1020. The movement of the magnetic body 1400 changes the distance between it and the inductor section 1200, which is fixedly disposed inside the housing 1010. Due to this change in distance, the inductance of the inductor section 1200 changes.

[0140] The protective component 1500 comprises an elastic material and can be clamped between the other end of the core 1020 and the movable support 1300. The other end of the core 1020 can be protected by the protective component 1500. Since the protective component 1500 is clamped between the other end of the core 1020 and the movable support 1300, the movable support 1300 can move synchronously with the core 1020.

[0141] As shown in FIG23, the protective member 1500 may include a protrusion 1510 protruding outward from the outside. The protrusion 1510 can be inserted into an insertion groove 1310 formed on the movable bracket 1300. Through the protrusion 1510 of the protective member 1500 and the insertion groove 1310 of the movable bracket 1300, the protective member 1500 can be stably fixed on the movable bracket 1300, so that the other end of the core 1020 can be fixed on the movable bracket 1300.

[0142] The movable bracket 1300 may include a first protrusion 1330a and a second protrusion 1330b. The first protrusion 1330a and the second protrusion 1330b may protrude from the outer surface of the movable bracket 1300 in an outward direction or in a direction perpendicular to the length of the stylus 1000. The first protrusion 1330a and the second protrusion 1330b may be disposed in the guide hole 1630 of the fixed bracket 1600 shown in FIG. 17. When the movable bracket 1300 moves synchronously with the movement of the core 1020, the first protrusion 1330a and the second protrusion 1330b may move along the guide hole 1630 of the fixed bracket 1600.

[0143] The movable bracket 1300 may include a third protrusion 1350. The third protrusion 1350 may protrude from the outer surface of the movable bracket 1300 in an outward direction or in a direction perpendicular to the length direction of the stylus 1000. The third protrusion 1350 may be disposed in the guide hole 1650 of the fixed bracket 1600 shown in FIG. 17. When the movable bracket 1300 moves synchronously with the movement of the core 1020, the third protrusion 1350 may move along the guide hole 1650 of the fixed bracket 1600.

[0144] The movable support 1300 may include an extension 1370. The extension 1370 may extend from the outside of the movable support 1300 along the length of the stylus 1000. Alternatively, the extension 1370 may extend from the outside of the movable support 1300 along the length of the core 1020. The extension 1370 may have a structure and shape that can be disposed within the elastomer 1700. An extension 1870 of the elastic member 1800 may be disposed at the end of the extension 1370.

[0145] The movable support 1300 may include an electrode pattern 1390. The electrode pattern 1390 may be disposed on the outside of the extension 1370 and on the first protrusion 1330a and the second protrusion 1330b formed on the outside of the movable support 1300.

[0146] Electrode pattern 1390 can contact and be electrically connected to the elastic body 1700 surrounding the extension 1370 of the movable support 1300. Electrode pattern 1390 can contact and be electrically connected to the electrode pattern 1690 of the fixed support 1600 shown in FIG. 17, and can be electrically disconnected from the electrode pattern 1690 of the fixed support 1600 by the movement of the core 1020.

[0147] The electrode pattern 1390 may be plated on the outside of the non-conductive movable bracket 1300. For example, the electrode pattern 1390 may be formed on the outside of the non-conductive movable bracket 1300 by laser direct structuring (LDS) and laser manufacturing antenna (LMA).

[0148] The electrode pattern 1390 may include a base electrode pattern 1391 and a first extension pattern 1393a and a second extension pattern 1393b.

[0149] The base electrode pattern 1391 is disposed on the outside of the movable support 1300 and can be configured to surround the extension 1370 of the movable support 1300. The base electrode pattern 1391 is in contact with one end of the elastomer 1700.

[0150] The first extended pattern 1393a and the second extended pattern 1393b extend from both sides of the first electrode pattern 1391, respectively. The first extended pattern 1393a can be disposed on the first protrusion 1330a, and the second extended pattern 1393b can be disposed on the second protrusion 1330b. The first extended pattern 1393a and the second extended pattern 1393b can contact the electrode pattern 1690 of the fixed bracket 1600 shown in FIG. 17, or the contact can be released by the movement of the core 1020.

[0151] The elastomer 1700 is made of a conductive material and may have a spring shape. The elastomer 1700 can be disposed between the movable support 1300 and the elastic component 1800. Here, the elastomer 1700 is not in a fully compressed state, but rather in a partially compressed state, and can be sandwiched between the movable support 1300 and the elastic component 1800. When the external force applied to the movable support 1300, which is synchronized with the movement of the core 1020, is less than the elastic force pushing the partially compressed elastomer 1700 outward, the elastomer 1700 is not compressed; when the external force is greater than the elastic force, the elastomer 1700 begins to be compressed.

[0152] An extension 1370 of the movable support 1300 and an extension 1870 of the elastic member 1800 can be simultaneously disposed inside the elastomer 1700. This allows the internal space of the elastomer 1700 to be utilized, thus having the advantage of reducing the internal volume of the stylus 1000.

[0153] One end of the elastomer 1700 is electrically connected to the electrode pattern 1390 of the movable support 1300, and the other end is electrically connected to the terminal portion 2110 of the substrate 2100. The elastomer 1700 may include a connecting line 1710 connecting the elastomer 1700 and the terminal portion 2110 of the substrate 2100. One end of the connecting line 1710 is connected to the elastomer 1700, and the other end can be connected to the terminal portion 2110 of the substrate 2100. To protect and guide the connecting line 1710, the elastic member 1800 and the substrate support 1900 may have guide grooves for the connecting line 1710 to be configured.

[0154] The elastic component 1800 is made of a non-conductive material and has a predetermined elasticity. For example, the elastic component 1800 can be rubber.

[0155] The elastic component 1800 can be disposed between the movable support 1300 and the substrate support 1900.

[0156] Figure 24 is a perspective view of the elastic member 1800 shown in Figure 21 only, and Figure 25 is a perspective view of the substrate support 1900 and substrate 2100 shown in Figure 21.

[0157] Referring to Figures 18 to 25, the elastic member 1800 may include an extension 1870. The extension 1870 may extend from the outer side of the elastic member 1800 toward the movable support 1300. The extension 1870 may be disposed inside the elastic body 1700.

[0158] The elastic member 1800 may include a guide groove 1810. The guide groove 1810 may be formed on the outside of the elastic member 1800 along the length direction of the stylus 1000. The connecting line 1710 of the elastomer 1700 may be disposed in the guide groove 1810.

[0159] The elastic member 1800 may include a mounting groove 1850. The mounting groove 1850 is formed on the outside of the elastic member 1800. The mounting groove 1850 may be provided on the side opposite to the extension 1870. The mounting portion 1910 of the substrate support 1900 can be inserted into the mounting groove 1850. Inside the mounting groove 1850, a hook groove 1851 with a shape corresponding to the protrusion 1915 of the mounting portion 1910 of the substrate support 1900 may be formed. Thus, the elastic member 1800 can be stably fixed and disposed on the substrate support 1900.

[0160] The substrate support 1900 supports the substrate 2100 inside the housing 1010 and is combined with the elastic member 1800 to support the elastic member 1800.

[0161] The substrate support 1900 may include a side portion 1940 that guides and supports the substrate 2100.

[0162] The substrate support 1900 may include a mounting portion 1910 for engaging with the elastic member 1800. The mounting portion 1910 protrudes from the substrate support 1900 toward the movable support 1300. The mounting portion 1910 may include protrusions 1915 protruding from the outside. The protrusions 1915 may protrude in a direction perpendicular to the protrusion direction of the mounting portion 1910.

[0163] The substrate support 1900 may include a guide groove 1920. The guide groove 1920 guides and protects the connecting wires 1710 of the elastomer 1700.

[0164] The substrate 2100 is disposed on the substrate support 1900.

[0165] The substrate 2100 may include a plurality of terminal portions 2110, 2131, 2132, 2191, and 2192. Among the plurality of terminal portions 2110, 2131, and 2132, terminal portion 2110 is electrically connected to the elastomer 1700, and the first terminal portion 2131 and the second terminal portion 2132 are electrically connected to the coil portion 1230 of the inductor portion 1200. The third terminal portion 2191 and the fourth terminal portion 2192 are electrically connected to electrode patterns 1690 respectively disposed on both sides of the outer side of the fixing bracket 1600.

[0166] The substrate 2100 includes a capacitor section (not shown). One or more capacitors constituting the capacitor section (not shown) can be disposed on the substrate 2100.

[0167] The substrate 2100 may include a circuit pattern that electrically connects one or more capacitors of the capacitor section (not shown) to a plurality of terminal sections 2110, 2131, 2132.

[0168] Figure 26 is a schematic diagram illustrating the movement of the movable support 1300 and the electrical contact and release between the fixed support 1600 and the movable support 1300, as shown in Figures 17 to 25, of the core 1020.

[0169] Figure 26(A) shows the core 1020 when it is not subjected to any external force, and Figure 26(B) shows the core 1020 subjected to a predetermined external force, with the moving bracket 1300 moving in one direction.

[0170] First, referring to Figure 26(A), when no external force is applied to the core 1020, the electrode pattern 1390 of the movable bracket 1300 is in contact with the electrode pattern 1690 of the fixed bracket 1600. That is, the electrode pattern 1390 of the movable bracket 1300 and the electrode pattern 1690 of the fixed bracket 1600 are electrically connected to each other.

[0171] Since the elastomer 1700 pushes the second protrusion 1330b of the movable bracket 1300 toward the core 1020, the electrode pattern 1390 disposed outside the second protrusion 1330b can remain in contact with the electrode pattern 1690 of the fixed bracket 1600.

[0172] Next, referring to Figure 26(B), when a predetermined external force is applied to the core 1020 and the core 1020 moves in one direction, the movable bracket 1300 moves in conjunction with the core 1020 in the same direction. As the movable bracket 1300 moves in the same direction, the second protrusion 1330b also moves in the same direction. Due to the movement of the second protrusion 1330b, the contact between the electrode pattern 1390 of the movable bracket 1300 and the electrode pattern 1690 of the fixed bracket 1600 is released. Similarly, the first protrusion 1330a, located on the opposite side of the second protrusion 1330b, also moves, causing the electrode pattern 1390 of the movable bracket 1300 to release contact from the electrode pattern 1690 of the fixed bracket 1600. Furthermore, the elastomer 1700 is compressed by the movement of the movable bracket 1300.

[0173] As shown in Figure 26(B), when a predetermined external force is applied to the core 1020 and the core 1020 moves in one direction, the contact between the electrode pattern 1390 of the moving bracket 1300 and the electrode pattern 1690 of the fixed bracket 1600 is released. Due to the release of this contact, the capacitance of the capacitor portion (not shown) provided on the substrate 2100 changes. This change in capacitance alters the frequency of the pen signal emitted from the stylus 1000. The receiving side receiving the pen signal can determine that the stylus 1000 has made contact with the screen by sensing the changed frequency.

[0174] As the movable support 1300 moves, the magnetic body 1400 disposed inside the movable support 1300 also moves. With the movement of the magnetic body 1400, the distance between the inductor section 1200 and the magnetic body 1400 increases. Due to the change in distance between the inductor section 1200 and the magnetic body 1400, the inductance of the inductor section (not shown) changes. This change in inductance occurs simultaneously with the change in capacitance described earlier. Here, the change in capacitance can be configured to be more dominant than the change in inductance. It is easier to drastically change capacitance than to drastically change inductance within the limited space inside the stylus housing. Conversely, the change in inductance can also be configured to be more dominant than the change in capacitance, depending on the situation. Alternatively, the changes in capacitance and inductance can be configured to be almost similar. Regardless of which of these three cases, the movement of the movable support 1300 causes both capacitance and inductance to change, resulting in a change in the resonant frequency of the resonant circuit formed by the inductor section 1200 and the capacitor section. By sensing the change in this resonant frequency on the receiving side of the pen signal, it can be determined that the stylus 1000 is in contact with the screen.

[0175] Figure 27 is a diagram illustrating (A) and (B) of Figure 26 respectively. Figure 28 simplifies the stylus according to another embodiment of the present invention, and constructs (A) and (B) of Figure 26 respectively using equivalent circuit diagrams.

[0176] Referring to Figures 27 and 28(A) and (B), a plurality of capacitors C1, C2, C3, and Cs are disposed on substrate 2100. The plurality of capacitors C1, C2, C3, and Cs may constitute a capacitor section (not shown). At least one of the capacitors C1, C2, C3, and Cs is connected in parallel to each other to maintain a constant capacitance value. An auxiliary capacitor Cs is connected in parallel with the basic capacitor according to the contact or de-contact between the electrode pattern 1690 of the fixed bracket 1600 and the electrode pattern 1390 of the movable bracket 1300 shown in Figure 26, or it may not be connected to the basic capacitor.

[0177] First, as shown in Figures 27(A) and 28(A), with no external force acting on the core 1020, the electrode patterns 1690 of the fixed support 1600 and 1390 of the movable support 1300 are in contact with each other, so the auxiliary capacitor Cs is connected in parallel with the basic capacitors C1, C2, and C3. Therefore, the capacitance of the capacitor section (not shown) is the sum of the capacitance values ​​of the basic capacitors C1, C2, and C3 and the capacitance of the auxiliary capacitor Cs.

[0178] Next, as shown in Figures 27(B) and 28(B), when a predetermined external force is applied to the core 1020, the electrode pattern 1390 of the movable support 1300, synchronized with the movement of the core 1020, releases contact between the electrode pattern 1690 of the fixed support 1600 and the electrode pattern 1690 of the movable support 1300. Therefore, the auxiliary capacitor Cs cannot be electrically connected to the basic capacitors C1, C2, and C3, and the capacitance of the capacitor section (not shown) changes to the capacitance values ​​of the basic capacitors C1, C2, and C3.

[0179] In particular, referring to Figure 28(B), it can be confirmed that the electrode pattern 1390 of the movable bracket 1300 and the electrode pattern 1690 of the fixed bracket 1600 are in contact at two points. As shown in Figures 21 and 22, this can be understood from the fact that the fixed bracket 1600 has two electrode patterns 1690, and the first extended pattern 1393a and the second extended pattern 1393b are arranged on the first protrusion 1330a and the second protrusion 1330b of the movable bracket 1300.

[0180] When the external force applied to the core 1020 is insufficient to separate the first extension pattern 1393a and the second extension pattern 1393b from the two electrode patterns 1690 of the fixed bracket 1600, that is, when the first extension pattern 1393a is separated from one electrode pattern 1690 of the fixed bracket 1600, but the second extension pattern 1393b is not separated from the other electrode pattern 1690 of the fixed bracket 1600, the auxiliary capacitor Cs remains connected in parallel with the basic capacitors C1, C2, and C3.

[0181] Conversely, the auxiliary capacitor Cs is only disconnected from the basic capacitors C1, C2, and C3 when the external force applied to the core 1020 is sufficient to completely separate both the first extension pattern 1393a and the second extension pattern 1393b from the two electrode patterns 1690 of the fixed bracket 1600. Therefore, when using the stylus 1000 according to another embodiment of the present invention, a reference pressure distinguishing between hover and contact can be clearly set, thus providing the advantage of a clear distinction between hover and contact. In particular, even if either the first extension pattern 1393a or the second extension pattern 1393b does not contact either of the two electrode patterns 1690 of the fixed bracket 1600 due to manufacturing process problems or user negligence, the other extension pattern and the other electrode pattern in the stylus 1000 according to another embodiment of the present invention can still remain in contact, thus providing the advantage of a clear distinction between hover and contact states.

[0182] Figure 29 is a perspective view of the stylus 1000 according to another embodiment of the present invention shown in Figure 15, viewed from the side of the core 1020. Figure 30(A) is a portion of a cross-sectional view of the stylus 1000 shown in Figure 29 cut along line A-A'. Figure 30(B) is a portion of a cross-sectional view of the stylus 1000 shown in Figure 29 cut along line B-B'. Figure 31 is a schematic diagram showing the side view (A), (B) and cross-sectional view of the ferrite core 1210 shown in Figures 29 to 30.

[0183] Referring to Figures 17, 29 to 31, the housing 1010 of the stylus 1000 has a rectangular cylindrical shape with rounded corners, and the portion of the housing 1020 that exposes a part of the core 1010 has a shape in which the width gradually narrows in the outward direction.

[0184] Based on the shape of the housing 1010, the components disposed inside also correspond to the shape of the housing 1010. Among the internal components, the ferrite core 1210 of the inductor section 1200 also has an optimized structure corresponding to the shape of the housing 1010.

[0185] As shown in Figures 30(A) and (B), the ferrite core 1210 has a first cross-sectional shape cut along a first vertical direction (A-A' direction in Figure 29) perpendicular to the axial direction x of the ferrite core 1210 (or the length direction of the stylus 1000) and a second cross-sectional shape cut along a second vertical direction (B-B' direction in Figure 29). Specifically, the thickness w1 of the ferrite core 1210 in the first vertical direction is different from the thickness w2 in the second vertical direction. More specifically, the thickness w1 in the first vertical direction is less than the thickness w2 in the second vertical direction. Here, the thickness w1 in the first vertical direction can be defined as the shortest distance from the through hole 1210h of the ferrite core 1210 to the outside of the ferrite core 1210 in the first cross-sectional shape, and the thickness w2 in the second vertical direction is the shortest distance from the through hole 1210h of the ferrite core 1210 to the outside of the ferrite core 1210 in the second cross-sectional shape. In addition, unlike the figure, the thickness w1 in the first vertical direction can be the overall thickness of the ferrite core 1210 in the first cross-sectional shape, and the thickness w2 in the second vertical direction can be the overall thickness of the ferrite core 1210 in the second cross-sectional shape.

[0186] The ferrite core 1210 has a cylindrical or cylindrical shape. At least a portion of the outer surface of the ferrite core 1210 may have a planar portion 1210d. Another portion of the outer surface of the ferrite core 1210 may also have a planar portion corresponding to the planar portion 1210d. Through the planar portion 1210d, the ferrite core 1210 can be stably disposed inside the housing 1010. The planar portion 1210d is formed to extend from one end of the ferrite core 1210 to the other end along the axial direction x of the ferrite core 1210.

[0187] One end of the ferrite core 1210 may include at least two curved surfaces 1210c. As shown in Figures 30(A) and (B), at least a portion of the curved surface 1210c may appear in the second cross-sectional shape but not in the first cross-sectional shape. The curved surface 1210c may be a curved surface that bends along the lateral direction of the through hole 1210h from one side of one end of the ferrite core 1210 to the portion adjacent to the through hole 1210h of the ferrite core 1210. Such curved surfaces 1210c may be respectively provided on opposite sides of one end of the ferrite core 1210 with reference to the through hole 1210h.

[0188] As shown in Figures ①②③ of Figure 31, along the axial direction x of the ferrite core 1210, the curved surface 1210c changes from an aspherical shape to a spherical shape. Figure ③ of Figure 31 shows the curved surface 1210c as an aspherical shape, while Figure ① of Figure 31 shows the curved surface 1210c as a spherical shape. Furthermore, Figure ② of Figure 31 shows that the curved surface 1210c is an intermediate shape between an aspherical shape and a spherical shape.

[0189] At one end of the ferrite core 1210, the planar portion 1210d has a shape in which the width gradually narrows along the axial direction x of the ferrite core 1210. Here, the width of the planar portion 1210d can decrease non-linearly.

[0190] When using the ferrite core 1210 described above, as shown in Figures 6 to 8, the inductor portion 1200 including the ferrite core 1210 can be disposed inside the stylus 1000 closer to the tip of the core 1020. Therefore, the inductor portion 1200 can be positioned relatively closer to the receiver side (not shown), thus having the advantage of increasing the magnitude of the pen signal received at the receiver side.

[0191] Figure 32 is a schematic diagram illustrating a modified example of the ferrite core 1210 shown in Figure 31, and Figure 33 is a perspective view of the inductor section 1200' with a coil 1230' wound around the outside of the ferrite core 1210' shown in Figure 32.

[0192] Referring to Figure 32, the ferrite core 1210' has a cylindrical shape.

[0193] One end of the ferrite core 1210' may include a curved surface 1210c'. The curved surface 1210c' may be a curved surface that bends along the direction of the through hole 1210h from one end of the ferrite core 1210' to the portion adjacent to the through hole 1210h of the ferrite core 1210'.

[0194] The ferrite core 1210' has a through hole 1210h extending along the axial direction x. The through hole 1210h can have a constant diameter from one end to the other.

[0195] As shown in Figures 1, 2, and 3 of Figure 32, along the axial direction x of the ferrite core 1210', the outer diameter of the curved section 1210c' decreases while the inner diameter remains constant. Here, the inner diameter is defined as the through hole 1210h. Furthermore, as shown in Figures 1, 2, and 3 of Figure 32, along the axial direction x of the ferrite core 1210', the thickness between the outer and inner diameters of the curved section 1210c' gradually decreases.

[0196] The rate of decrease of the outer diameter or the thickness (between the outer diameter and the inner diameter) along the axial direction x of the ferrite core 1210' can be non-linear. More specifically, when one end of the ferrite core 1210' is divided into an upper section (the part containing ③), a middle section (the part containing ②), and a lower section (the part containing ①), the rate of decrease of the outer diameter or the thickness from the upper section to the middle section can be relatively greater than the rate of decrease of the outer diameter or the thickness from the middle section to the lower section. In other words, there can be a relatively rapid rate of decrease from the upper section to the middle section, and a relatively slow rate of decrease from the middle section to the lower section.

[0197] Referring to Figure 33, coil 1230' can be wound around the outside (or outer circumference) of ferrite core 1210'.

[0198] The inductor section 1200', which includes the ferrite core 1210' and the coil 1230', can be disposed in a cylindrical housing (not shown) instead of inside the housing 1000 shown in FIG. 29. Although not shown in a separate figure, the ferrite core of the inductor section can have a shape corresponding to the internal shape of the housing.

[0199] The features, structures, and effects described in the above embodiments are included in one embodiment of the present invention, but are not necessarily limited to one embodiment. Furthermore, the features, structures, and effects exemplified in each embodiment can be implemented by combining or modifying other embodiments by those skilled in the art to which the embodiments pertain. Therefore, it should be interpreted that the content related to such combinations and modifications is included within the scope of the present invention.

[0200] Furthermore, the above description focuses on embodiments, but these are merely examples and not intended to limit the invention. Those skilled in the art can make various modifications and applications not illustrated above without departing from the essential characteristics of these embodiments. For example, the constituent elements specifically shown in the embodiments can be modified. Moreover, these modifications and applications should be interpreted as being included within the scope of the invention as defined in the appended claims.

[0201] 10: Inductor Section 11: Ferrite core 13: Coil 20: External magnetic body 100: Stylus 101: Shell 101a: First shell 101b: Second shell 101t: Conical part 102: Core 102a: Main Body 109: Button section 115, 115', 115'': Buffer components 120: Inductor Section 121, 121', 121'': Ferrite core 121a, 121a', 121a'': Upper section 121b, 121b', 121b'': Lower section 121c, 121c': Curved face 121c'': step difference part 121c1: First page 121c2: Second page 121c3: Third side 121d: Planar part 121h: Through hole 123: Coil section 131': Ferrite core 1000: Stylus 1010: Shell 1010t: Conical part 1020: Core 1021: Base 1025:Outer outline 1090: Button section 1150: Buffer component 1200, 1200': Inductor Section 1210, 1210': Ferrite core 1210c, 1210c': Curved surface 1210d: Planar part 1210h: Through hole 1230: Coil section 1230': Coil 1231: First connecting part 1232: Second connecting part 1300: Mobile Stand 1310: Insertion slot 1330a: First protrusion 1330b: Second protrusion 1350: Third protrusion 1370: Extension 1390: Electrode Pattern 1391: Base electrode pattern 1393a: First extended pattern 1393b: Second extended pattern 1400: Magnetic body 1500: Protective components 1510: Protrusion 1600: Fixed bracket 1610: Through hole 1611: First partition wall 1620: Insertion slot 1621: Protrusion 1622: Inner wall 1630: Guide hole 1640: Storage Space 1650: Guide hole 1660, 1665: Hanging holes 1667: Guiding protrusion 1680: Second partition wall 1690: Electrode Pattern 1700: Elastomer 1710: Connecting cable 1800: Elastic component 1810: Guide groove 1850: Mounting slot 1851: Hanging slot 1870: Extension 1900: Substrate support 1910: Installation Department 1915: Protrusion 1920: Guide groove 1940: Side 1960, 1965: Connecting section 1967: Guiding Department 2100:Substrate 2110, 2131, 2132, 2191, 2192: Terminal section C1, C2, C3, Cs: Capacitors L1: Tangent S: Pre-determined length S: Preset Height T1: Thickness T2: Thickness w1, w2: Thickness x: Axis direction Y: Central axis θ: Predetermined angle

Claims

1. A ferrite core disposed inside a stylus, comprising 60% to 80% by weight of iron (Fe), 15% to 30% by weight of manganese (Mn), and 3% to 20% by weight of zinc (Zn).

2. The ferrite core as claimed in claim 1, which is manufactured at a firing temperature of 800°C to 1800°C.

3. The ferrite core as claimed in claim 1, having a through hole formed along the length direction of the stylus, the ferrite core having a first cross-sectional shape in a first vertical direction perpendicular to the length direction and a second cross-sectional shape in a second vertical direction perpendicular to both the length direction and the first vertical direction, the first cross-sectional shape being different from the second cross-sectional shape, the ferrite core including a curved portion disposed at one end of the ferrite core, the curved portion including at least two curved surfaces that bend along the lateral direction of the through hole from one side of one end of the ferrite core to a portion adjacent to the through hole of the ferrite core.

4. The ferrite core as claimed in claim 3, wherein, The thickness of the ferrite core in the first vertical direction in the first cross-sectional shape is less than the thickness of the ferrite core in the second vertical direction in the second cross-sectional shape, and at least a portion of the curved surface appears only in the second cross-sectional shape.

5. The ferrite core as claimed in claim 3, wherein, The curved surface is configured to change from an aspherical shape to a spherical shape along the direction from one end of the ferrite core to the other end.

6. The ferrite core as claimed in claim 3, wherein, It includes a portion disposed outside the ferrite core and a planar portion formed between the two ends of the ferrite core along the length direction. At one end of the ferrite core, the planar portion is configured such that its width gradually narrows as it moves toward one end of the ferrite core.

7. A stylus, comprising: case; A core is configured such that one end is disposed outside the housing and the remainder is disposed inside the housing, and moves along its length by an external force acting on the one end; an inductor section is disposed inside the housing and includes a ferrite core having a through hole through the core and a coil wound around the outside of the ferrite core; a fixed bracket is fixedly disposed inside the housing and coupled to the other end of the ferrite core; and a movable bracket is disposed inside the fixed bracket, configured to surround the other end of the core, and linked with the core and synchronized with the movement of the core, wherein the ferrite core contains 60% to 80% by weight of iron (Fe), 15% to 30% by weight of manganese (Mn), and 3% to 20% by weight of zinc (Zn).

8. The stylus as described in claim 7, wherein, The ferrite core has a first cross-sectional shape in a first vertical direction perpendicular to the length direction and a second cross-sectional shape in a second vertical direction perpendicular to both the length direction and the first vertical direction. The first cross-sectional shape is different from the second cross-sectional shape. The ferrite core includes a curved surface disposed at one end of the ferrite core. The curved surface includes at least two curved surfaces that bend along the lateral direction of the through hole from one side of one end of the ferrite core to a portion adjacent to the through hole of the ferrite core.

9. The stylus as described in claim 8, wherein, It also includes: a magnetic body disposed inside the movable bracket, surrounding the other end of the core, and moving in conjunction with the movable bracket.

10. The stylus as described in claim 9, wherein, It also includes: a protective component disposed inside the movable bracket, which, together with the magnet, surrounds the other end of the core and presses the core between the core and the movable bracket.

11. The stylus as described in claim 7, wherein, include: A substrate support is fixed and disposed inside the housing, and is coupled to the other end of the fixed support; The substrate has a capacitor section that forms a resonant circuit with the inductor section and is disposed on the substrate support.

12. The stylus as described in claim 11, wherein, include: An elastic member is disposed inside the fixed bracket and on the substrate bracket; An elastomer is disposed inside the fixed bracket and between the movable bracket and the elastic component. The elastomer has an empty space inside. At least a portion of the movable bracket and at least a portion of the elastic component are in contact with each other and are disposed in the empty space of the elastomer.

13. The stylus as described in claim 12, wherein, The fixed bracket includes a pair of electrode patterns disposed opposite to each other on the outside. The movable bracket includes electrode patterns that contact or separate from the pair of electrode patterns as the core moves. The elastomer is made of a conductive material, one end of which is connected to the electrode patterns of the movable bracket, and the other end of which is connected to a first terminal of the substrate. The pair of electrode patterns of the fixed bracket are respectively connected to a second terminal and a third terminal of the substrate.

14. The stylus as described in claim 13, wherein, The capacitor section includes at least one capacitor and an auxiliary capacitor connected in parallel with one end of the capacitor. The first terminal is connected in series with the auxiliary capacitor, and the second and third terminals are connected in parallel with the other end of the capacitor.

15. The stylus as described in claim 13, wherein, A pair of electrode patterns of the fixed bracket are plated in a groove formed on the outside of the fixed bracket, and the electrode pattern of the movable bracket is plated in a groove formed on the outside of the movable bracket.

16. The stylus as described in claim 11, wherein, As the movable support moves in sync with the movement of the core, the resonant frequency of the resonant circuit changes.

17. The stylus as described in claim 16, wherein, At the point in time when the stylus is in a suspended state and a contact state, the capacitance of the capacitor changes more dominantly than the inductance of the inductor.

18. The stylus as described in claim 7, wherein, The thickness of the ferrite core in the first vertical direction in the first cross-sectional shape is less than the thickness of the ferrite core in the second vertical direction in the second cross-sectional shape.

19. The stylus as described in claim 7, wherein, The curved surface of the ferrite core is configured to change from an aspherical shape to a spherical shape along the direction from one end of the ferrite core to the other end.

20. The stylus as described in claim 7, wherein, It includes a portion disposed outside the ferrite core and a planar portion formed between the two ends of the ferrite core along the length direction. At one end of the ferrite core, the planar portion is configured such that its width gradually narrows as it moves toward one end of the ferrite core.

Images