Ferrite core and stylus pen including the same

Abstract

BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a ferrite core and a stylus pen including the same, and more particularly, to a ferrite core capable of improving a magnetization effect due to an external magnetic body and a stylus pen including the same.SOLUTION: A ferrite core according to an embodiment of the present invention is a ferrite core mounted inside a stylus pen, and the ferrite core includes 60 to 80 wt% of iron (Fe), 15 to 30 wt% of manganese (Mn), and 3 to 20 wt% of zinc (Zn).SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a ferrite core and a stylus pen including the same, and more particularly to a ferrite core capable of improving the magnetization effect of an external magnetic body and a stylus pen including the same. [Background technology]

[0002] A stylus pen is a pen-shaped device that can input data by lightly touching the screen when dragging or clicking.

[0003] Stylus pens can be classified into active stylus pens and passive stylus pens depending on whether they contain a battery and electronic components.

[0004] Passive stylus pens have the advantages of being cheaper and not requiring batteries compared to active stylus pens, but have the disadvantage of being less able to detect precise touches compared to active stylus pens. However, recently, the EMR (Electro Magnetic Resonance) method has been used to realize passive stylus pens that can detect precise touches.

[0005] FIG. 1 is a simplified diagram showing an inductor section 10 of a conventional EMR type stylus pen and an external magnetic body 20 that affects the inductor section 10, and FIG. 2 is a diagram for explaining how the external magnetic body 20 shown in FIG. 1 changes the resonant frequency of the resonant circuit section of the conventional EMR type stylus pen.

[0006] Referring to FIG. 1, a conventional EMR stylus pen has a resonant circuit unit (not shown) that is composed of a capacitor unit (not shown) and an inductor unit 10 .

[0007] As shown in Fig. 1, the inductor unit 10 is composed of a ferrite core 11 and a coil 13 wound around the outer surface of the ferrite core to generate a magnetic field. The conventional material for the ferrite core 11 is a nickel-manganese (Ni-Mn) series.

[0008] The inductor unit 10 is magnetized by the magnetic body 20 located around it. Specifically, the characteristics of the ferrite core 11 change due to the external magnetic body 20, and the inductance of the inductor unit 10 changes.

[0009] The change in inductance shifts the resonant frequency of the resonant circuit unit as shown in FIG. 2, and this change in resonant frequency leads to a degradation 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. First and second magnetic bodies 61 and 62 are disposed at the ends of a first frame 111 and a second frame 111 inside the foldable electronic device 1. When the foldable electronic device 1 is folded, the first magnetic body 61 and the second magnetic body 62 overlap each other, and the attractive force between them reduces the phenomenon of the gap between the first housing 11 and the second housing 12 widening. When the inductor unit 10 shown in FIG. 1 is positioned near the first and second magnetic bodies 61 and 62, the ferrite core of the inductor unit 10 is magnetized, causing a change in the resonant frequency.

[0011] Meanwhile, there are a number of magnetic objects in everyday life and environments, such as laptops, scissors, smart watches, and tweezers, and these magnetic objects can also magnetize the inductor part of the stylus pen. [Prior art documents] [Patent documents]

[0012] [Patent Document 1] Korean Patent Publication No. 10-2024-0054830 Summary of the Invention [Problem to be solved by the invention]

[0013] SUMMARY OF THE INVENTION An object of the present invention is to provide a ferrite core capable of improving the magnetization effect of an external magnetic body, and a stylus pen including the same. [Means for solving the problem]

[0014] The ferrite core according to an embodiment of the present invention is a ferrite core that is installed inside a stylus pen, and contains 60 to 80 (weight %) iron (Fe), 15 to 30 (weight %) manganese (Mn), and 3 to 20 (weight %) zinc (Zn).

[0015] A stylus pen according to an embodiment of the present invention includes a housing, a core having one end disposed outside the housing and the other end disposed inside the housing and configured to move longitudinally in response to an external force acting on the one end, an inductor section disposed inside the housing and including a ferrite core having a through hole through which the core passes and a coil wound on the outer surface of the ferrite core, a fixed bracket fixedly disposed inside the housing and connected to the other end of the ferrite core, and a movable bracket disposed inside the fixed bracket, surrounding the other end of the core and configured to move in conjunction with the core and be synchronized with the movement of the core, wherein the ferrite core contains 60 to 80 (by weight) iron (Fe), 15 to 30 (by weight) manganese (Mn), and 3 to 20 (by weight) zinc (Zn). [Effects of the Invention]

[0016] The ferrite core and the stylus pen including the ferrite core according to the embodiment of the present invention have the advantage of being able to improve the influence of magnetization caused by an external magnetic material, and further, it is possible to minimize the change in the resonant frequency of the resonant circuit unit, thereby preventing degradation of the input system performance. [Brief explanation of the drawings]

[0017] [Figure 1a] FIG. 1a is a diagram simply illustrating an inductor part 10 of a conventional EMR type stylus pen and an external magnetic body 20 that affects the inductor part 10. As shown in FIG.

[0018] [Figure 1b] FIG. 1b is a diagram illustrating how the resonance frequency of the resonance circuit of the conventional EMR type stylus pen changes due to the external magnetic body 20 shown in FIG.

[0019] [Figure 2] FIG. 2 is a graph showing the change in resonant frequency due to the influence of magnetization in an EMR-type stylus pen having a ferrite core according to one embodiment of the present invention (hereinafter referred to as an embodiment stylus pen) and a conventional EMR-type stylus pen having a general ferrite core (hereinafter referred to as a conventional stylus pen).

[0020] [Figure 3] FIG. 3 is a perspective view of a stylus pen 100 according to an embodiment of the present invention.

[0021] [Figure 4] FIG. 4 is a cross-sectional view of part A of the stylus pen 100 shown in FIG.

[0022] [Figure 5] FIG. 5 is a detailed cross-sectional view of the inductor section 120 shown in FIG.

[0023] [Figure 6] 6(a) and 6(b) are diagrams illustrating the internal configuration of the stylus pen according to an embodiment of the present invention shown in FIGS. 4 and 5 and the effects thereof.

[0024] [Figure 7] 7A to 7C are diagrams for explaining in more detail the internal structure and effects of the stylus pen according to an embodiment of the present invention shown in FIGS. 4 and 5. FIG.

[0025] [Figure 8] FIG. 8 is a diagram illustrating the increase in the magnitude of the pen signal according to the predetermined height S shown in (a) to (c) of FIG.

[0026] [Figure 9] FIG. 9 is a perspective view of a modified example of the ferrite core 121 shown in FIGS.

[0027] [Figure 10] 10(a) is an enlarged front view of a portion of the ferrite core 121' shown in FIG. 9, and FIG. 10(b) is a cross-sectional view taken along line A-A' in FIG. 10(a).

[0028] [Figure 11] FIG. 11 is a cross-sectional view of a stylus pen to which another modified example of the ferrite core 121 shown in FIG. 4 is applied.

[0029] [Figure 12] FIG. 12 is a cross-sectional view showing only the ferrite core 121'' and the coil portion 123 shown in FIG.

[0030] [Figure 13] FIG. 13 is a perspective view of the ferrite core 121'' shown in FIGS.

[0031] [Figure 14] 14(a) is an enlarged front view of a portion of the ferrite core 121'' shown in FIG. 13, and FIG. 14(b) is a cross-sectional view taken along line BB' in FIG. 13(a).

[0032] [Figure 15] FIG. 15 is a perspective view of a stylus pen 1000 according to another embodiment of the present invention.

[0033] [Figure 16] FIG. 16 is a cross-sectional view of a portion of the stylus pen 1000 shown in FIG.

[0034] [Figure 17] FIG. 17 is a perspective view of the stylus pen 1000 shown in FIG. 15 with the housing 1010 removed.

[0035] [Figure 18] FIG. 18 is a perspective view of only the fixed bracket 1600 shown in FIG.

[0036] [Figure 19] FIG. 19 is a perspective view of the fixing bracket 1600 shown in FIG. 18, seen from another direction.

[0037] [Figure 20] FIG. 20 is a partial perspective view of FIG. 17 seen from another direction.

[0038] [Figure 21] FIG. 21 is a perspective view of the inductor section 1200 and the fixing bracket 1600 shown in FIG. 17 removed.

[0039] [Figure 22] FIG. 22 is a perspective view of FIG. 21 seen from another direction.

[0040] [Figure 23] FIG. 23 is a cross-sectional view of FIG.

[0041] [Figure 24] FIG. 24 is a perspective view of only the elastic member 1800 shown in FIG.

[0042] [Figure 25]FIG. 25 is a perspective view of the board bracket 1900 and board 2100 shown in FIG.

[0043] [Figure 26] FIG. 26 is a diagram illustrating the movement of the moving bracket 1300 due to the movement of the core body 1020 shown in FIGS. 17 to 25, and the electrical contact and disconnection between the fixed bracket 1600 and the moving bracket 1300.

[0044] [Figure 27] FIG. 27 is a diagram of (A) and (B) of FIG. 26, respectively.

[0045] [Figure 28] FIG. 28 shows a simplified stylus pen according to another embodiment of the present invention, configured as an equivalent circuit diagram for each of (A) and (B) of FIG.

[0046] [Figure 29] FIG. 29 is a perspective view of the stylus pen 1000 according to another embodiment of the present invention shown in FIG. 15, viewed from the side of the core body 1020. In FIG.

[0047] [Figure 30] FIG. 30A is a partial cross-sectional view of the stylus pen 1000 shown in FIG. 29 taken along line A-A'.

[0048] FIG. 30B is a partial cross-sectional view of the stylus pen 1000 shown in FIG. 29 taken along line BB'.

[0049] [Figure 31] FIG. 31 shows side views A and B and a cross-sectional view of the ferrite core 1210 shown in FIGS.

[0050] [Figure 32] FIG. 32 is a diagram for explaining a modification of the ferrite core 1210 shown in FIG.

[0051] [Figure 33] FIG. 33 is a perspective view of an inductor section 1200' in which a coil 1230' is wound on the outer surface of the ferrite core 1210' shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0052] The following detailed description of the present invention refers to the accompanying drawings, which show, by way of example, specific embodiments in which the invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the invention. It should be understood that various embodiments of the present invention, although different from one another, are not necessarily mutually exclusive. For example, specific shapes, structures, and characteristics described herein in connection with one embodiment may be embodied in other embodiments without departing from the spirit and scope of the invention. It should also be understood that the location or arrangement of individual components within each disclosed embodiment may be modified without departing from the spirit and scope of the invention. Therefore, the following detailed description is not intended to be taken in a limiting sense, and the scope of the present invention is limited only by the appended claims, along with the full scope of equivalents to which such claims, if properly interpreted, are entitled. In the drawings, like reference numerals indicate the same or similar functionality throughout the various aspects.

[0053] A ferrite core according to an embodiment of the present invention is configured to be able to improve the magnetization effect of an external magnetic body.

[0054] Specifically, the ferrite core according to an embodiment of the present invention may have various shapes. For example, it may have a cylindrical shape as shown in Fig. 1. In addition, it may have the shape of a ferrite core inside a stylus pen according to various embodiments described below. The shape of the ferrite core according to an embodiment of the present invention is not limited to a specific shape.

[0055] The ferrite core according to one embodiment of the present invention includes iron (Fe), manganese (Mn), and zinc (Zn).

[0056] 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). Preferably, the ferrite core is composed of 70% by weight of iron (Fe), 18% by weight of manganese (Mn), and 12% by weight of zinc (Zn).

[0057] The ferrite core may be formed of iron (Fe), manganese (Mn), and zinc (Zn) having the composition ranges mentioned above at a firing temperature of 800 to 1800°C.

[0058] FIG. 2 is a graph showing the change in resonant frequency due to the influence of magnetization in an EMR-type stylus pen having a ferrite core according to one embodiment of the present invention (hereinafter referred to as an embodiment stylus pen) and a conventional EMR-type stylus pen having a general ferrite core (hereinafter referred to as a conventional stylus pen).

[0059] The graph of Figure 2 shows the results of forcibly magnetizing three stylus pens of the embodiment and three stylus pens of the conventional embodiment under the same conditions except for the ferrite core, using the external magnetic body 20 shown in Figure 1. In the graph of Figure 3, the horizontal axis represents time (Time [sec]) and the vertical axis represents resonance frequency (Resonance Frequency [Hz]).

[0060] 2, it can be seen that, in the case of the three stylus pens of the present invention, the change in the resonant frequency is relatively small and remains almost constant regardless of time, despite the forced magnetization. In contrast, in the case of the three conventional stylus pens, it can be seen that the resonant frequency varies over time for each conventional stylus pen, and the magnetization tendency is also different.

[0061] From the above results, it can be seen that the magnetization effect is improved by one or more of the material, manufacturing cost, and firing temperature of the ferrite core according to the embodiment of the present invention, and the change in the resonant frequency due to magnetization hardly occurs.

[0062] Hereinafter, a stylus pen including a ferrite core according to the above-described embodiment of the present invention will be described with reference to the accompanying drawings.

[0063] FIG. 3 is a perspective view of a stylus pen 100 including a ferrite core according to one embodiment of the present invention.

[0064] Referring to FIG. 3, a stylus pen 100 including a ferrite core according to an embodiment of the present invention includes a housing 101, a core body 102, and a ferrite core (not shown) disposed inside the housing 101.

[0065] The housing 101 forms the exterior of the stylus pen 100. The housing 101 has a predetermined space formed inside and is elongated in one direction. The housing 101 may be formed by combining two or more parts together, or may be formed as a single, integrated part.

[0066] The housing 101 may be made of a non-conductive synthetic resin material.

[0067] 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 exterior of the stylus pen 100. Various components are housed inside the first housing 101a and the second housing 101b.

[0068] A button unit 109 may be arranged on the housing 101. The button unit 109 may be arranged on the outer surface of the middle of the second housing 101b. The button unit 109 may be for performing a specific operation of the stylus pen 100. For example, the button unit 109 may be a mechanical or contact button for a cancel operation.

[0069] The core 102 includes one end portion disposed outside the housing 101, and the remaining portion excluding the one end portion is disposed inside the housing 101. Here, the one end portion of the core 102 may also be called a pen tip.

[0070] An external force can move a portion of one end of the core body 102 into the housing 101. As the external force increases, the volume of the portion of the one end of the core body 102 that enters the housing 101 can increase. When the applied external force decreases, the portion of the one end of the core body 102 moves out of the housing 101 again due to the mechanical action of the components inside the housing 101. When the external force is removed, the portion of the one end of the core body 102 returns to its original state.

[0071] The internal structure of the housing 101 will now be described with reference to FIGS.

[0072] 4 is a cross-sectional view of part A of the stylus pen 100 shown in FIG. 3, and FIG. 5 is a detailed cross-sectional view of the inductor section 120 shown in FIG.

[0073] 4 and 5, a stylus pen 100 according to an embodiment of the present invention includes a buffer member 115, an inductor unit 120, and a capacitor unit (not shown) disposed inside a housing 101.

[0074] The buffer member 115 is disposed inside the housing 101, and is disposed 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 a portion adjacent to one end of the core body 102 among both ends of the housing 101, and has a shape in which the width and diameter decrease toward the end of the one end of the housing 101.

[0075] The buffer member 115 has a conical or polygonal pyramid shape and has a through hole through which one end of the ferrite core 121 and the body 102a of the core 102 pass. The inner surface defining the through hole may 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 is disposed within the through hole of the ferrite core 121.

[0076] The buffer member 115 may be made of an elastic material such as rubber to act as a buffer between the ferrite core 121 and the housing 101. The buffer member 115 can protect the housing 101, the ferrite core 121, etc., and can block the influence of external mechanical shocks.

[0077] The buffer member 115 has a shape that covers one end of the ferrite core 121 or the lower end 121 b of the ferrite core 121 .

[0078] An imaginary tangent line L1, which is commonly tangent to the tapered portion 101t of the housing 101 and a portion of the core 102 (or the pen tip) disposed outside the housing 101, forms a predetermined angle θ with the central axis Y of the core 102. Here, the predetermined angle θ is preferably within 30°. If the predetermined angle θ is within 30°, drawing is possible even when the stylus pen according to an embodiment of the present invention is tilted at an angle of 60° with respect to the contact surface.

[0079] The inductor unit 120 can form an LC resonator together with a capacitor unit (not shown). The resonant frequency can be set by the inductance L value of the inductor unit 120 and the capacitance C value of the capacitor unit (not shown). The resonant frequency can be varied by changing the inductance L value of the inductor unit 120 and the capacitance C value of the capacitor unit (not shown).

[0080] The inductor portion 120 includes a ferrite core 121 and a coil portion 123 wound around the outer surface of the ferrite core 121 .

[0081] The coil portion 123 may be wound around the ferrite core 121 in at least one layer.

[0082] The ferrite core 121 may have an overall cylindrical or polygonal cylindrical shape, and may have a through-hole 121h formed therethrough along the length of the ferrite core 121.

[0083] The ferrite core 121 contains iron (Fe), manganese (Mn), and zinc (Zn).

[0084] The ferrite core 121 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). Preferably, the ferrite core 121 contains 70% by weight of iron (Fe), 18% by weight of manganese (Mn), and 12% by weight of zinc (Zn).

[0085] The ferrite core 121 may be formed of iron (Fe), manganese (Mn), and zinc (Zn) having the above-mentioned composition range at a firing temperature of 800 to 1800°C.

[0086] Depending on one or more of the material, manufacturing cost, and firing temperature of the ferrite core 121, as mentioned in Figure 2, there is an advantage that the magnetization effect is improved and the resonant frequency of the LC resonant part remains almost unchanged despite magnetization by an external magnetic body.

[0087] The ferrite core 121 has a through-hole 121h therein through which the body 102a of the core 102 passes. The body 102a of the core 102 can move linearly back and forth along the length direction via the through-hole 121h.

[0088] One end of the ferrite core 121 may have a tapered shape in which the diameter or width decreases toward the end. Here, the outer surface of the tapered end may include at least one curved portion 121c that is curved inward.

[0089] The ferrite core 121 may include an upper end 121a and a lower end 121b disposed below the upper end 121a. Here, the upper end 121a and the lower end 121b may be integrally formed.

[0090] The upper end 121a has a cylindrical, multi-cylinder, or polygonal tube shape. The diameter or width of the cylinder or polygonal tube may be constant as shown in the drawings. Alternatively, the diameter or width of the cylinder, multi-cylinder, or polygonal tube may not be constant, and may be different from the diameter or width of a portion.

[0091] The upper end portion 121a has a part of a through-hole 121h formed therein, through which the body 102a of the core member 102 passes. A coil portion 123 is disposed on the outer surface of the upper end portion 121a.

[0092] The lower end portion 121b has the remainder of a through-hole 121h formed therein, through which the body 102a of the core member 102 passes.

[0093] The bottom end 121b has a tapered shape that narrows from top to bottom, and at least a portion of the outer surface of the bottom end 121b has a curved portion 121c that curves inward of the bottom end 121b. The number of curved portions 121c may be at least one. The technical effects of a stylus pen according to an embodiment of the present invention, including a ferrite core 121 having such a curved portion 121c, will be described below with reference to the drawings.

[0094] Figures 6(a) and 6(b) are diagrams illustrating the internal configuration and effects of the stylus pen 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 pen according to an embodiment of the present invention shown in Figures 4 and 5, and Figure 6(a) is a cross-sectional view of the stylus pen when the ferrite core 121 of Figure 6(b) is replaced with the ferrite core 131' shown on the right side of Figure 2.

[0095] Referring to Figures 6(a) and 6(b), the stylus pen according to one embodiment of the present invention shown in Figure 6(b) can position the ferrite core 121 further below the ferrite core 131' shown in Figure 6(a) by a predetermined length S.

[0096] According to this configuration, when the stylus pen according to an embodiment of the present invention is used, the inductor unit 120 including the ferrite core 121 can be brought closer to the receiver (not shown) disposed below the core 102 of the stylus pen. Therefore, there is an advantage in that the magnitude of the pen signal sensed by the receiver is increased. This is possible because the thickness (between the inner surface and the outer surface) of the buffer member 115 can be reduced due to the shape of the ferrite core 121 of the stylus pen according to an embodiment of the present invention. This will be described in detail below with reference to FIG. 7.

[0097] Figures 7(a) to 7(c) are diagrams for explaining in more detail the internal configuration and effects of the stylus pen 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) is a diagram in which the ferrite core 121 is disposed in the same position as the ferrite core 131' in Figure 7(a).

[0098] 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 lower the ferrite core 131' can be positioned as far as possible within the tapered portion 101t of the housing 101. However, the thickness T2 is limited by the structure of the buffer member 115' and other manufacturing process considerations.

[0099] Here, assuming that the thickness T2 is the minimum thickness that the buffer member 115' can have due to the structure of the buffer member 115' or other manufacturing process reasons, when the conventional ferrite core 131' is placed at the lowest end within the housing 101, it will be as shown in Figure 7(a).

[0100] 7(c), the ferrite core 121 is disposed in the same position as the ferrite core 131' in FIG. 7(a). However, the ferrite core 121 has a curved surface 121c, and accordingly, the buffer member 115'' has a structural difference from the buffer member 115' shown in FIG. 7(a). Specifically, the inner surface of the buffer member 115'' has an outwardly convex curved surface corresponding to the curved surface 121c of the ferrite core 121.

[0101] The thickness between the outer surface of the buffer member 115'' and the curved inner surface varies depending on the position. Specifically, the upper and lower ends of the inner surface of the buffer member 115'' have a minimum thickness of T2 from the outer surface, and the middle part of the inner surface of the buffer member 115'' has a thickness between T2 and T1 (>T2).

[0102] In Figure 7(c), at least a portion (top and bottom) of the buffer member 115'' satisfies the minimum thickness of T2, and the thickness of the middle portion of the buffer member 115'' is T1, which is greater than the minimum thickness of T2. As such, since the thickness T1 of the middle portion of the buffer member 115'' is greater than T2, the buffer member 115'' has the advantage of being easier to manufacture than the conventional buffer member 115' of Figure 7(a).

[0103] Referring to (b) of FIG. 7, the inner surface of the buffer member 115 is formed as a curved surface by the curved surface portion 121c of the ferrite core 121. The upper and lower ends of the inner surface of the buffer member 115 have a thickness of T3 (<T2) with respect to the outer surface of the buffer member 115, 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.

[0104] In (b) of FIG. 7, although the minimum thickness of T2 cannot be satisfied at the upper and lower ends of the buffer member 115, the minimum thickness of T2 can be satisfied at the middle portion of the buffer member 115, so that the buffer member 115 can be manufactured. The buffer member 115 manufactured in this way has a smaller minimum thickness than the buffer members 115' and 115'' shown in (a) and (c) of FIG. 7, so that the volume of the buffer member 115 can be further reduced. Therefore, the buffer member 115 can be further disposed downward inside the tapered portion 101t of the housing 101, and thereby, the ferrite core 121 can be further disposed downward by a predetermined height S compared to (a) and (c) of FIG. 7.

[0105] FIG. 8 is a drawing for explaining the increase amount of the pen signal magnitude according to the predetermined height S shown in (a) to (c) of FIG. 7.

[0106] Referring to the table shown in FIG. 8, it can be confirmed that as the predetermined height S increases, the magnitude of the pen signal received on the receiver side increases.

[0107] As described above, the stylus pen 100 according to an embodiment of the present invention shown in FIGS. 4 to 7 has a configuration in which the shape of the tapered portion of the ferrite core 121 of the inductor portion 120 is different from that of the conventional ferrite core 131', so that the thickness of the buffer member can be further reduced, and the ferrite core 121 can be disposed closer to the end of the core body 102 inside the housing 101. Therefore, on the receiver side that receives the pen signal emitted from the stylus pen 100 according to an embodiment of the present invention, a larger pen signal can be obtained, and the sensing sensitivity of the stylus pen on the receiver side can be improved.

[0108] Meanwhile, the receiver mentioned above refers to a module or device that receives a pen signal emitted from the stylus pen 100 according to an embodiment of the present invention. The receiver may be a general digitizer or a display panel. The display panel may have at least one loop pattern made of a conductive material. The loop pattern may be coupled to a touch sensor or may be coupled to the display panel separately from the touch sensor.

[0109] FIG. 9 is a perspective view of a modified example of the ferrite core 121 shown in FIGS. 4 and 5. FIG. 10(a) is an enlarged front view of a portion of the ferrite core 121′ shown in FIG. 9, and FIG. 10(b) is a cross-sectional view taken along line A-A′ in FIG. 10(a).

[0110] 9 and 10, the ferrite core 121' has a cylindrical shape. A flat surface 121d may be disposed on at least a portion of the outer surface of the ferrite core 121'. A flat surface corresponding to the flat surface 121d may also be disposed on another portion of the outer surface of the ferrite core 121'. The flat surface 121d may allow the ferrite core 121' to be stably disposed inside the housing.

[0111] The ferrite core 121' has a cylindrical upper end 121a' and a lower end 121b', and the lower end 121b' may have at least two curved portions 121c'. The curved portions 121c' may be curved from the outer surface of the lower end 121b' to a portion adjacent to the through-hole 121h of the ferrite core 121'. The curved portions 121c' may be disposed on both sides of the lower end 121b' facing each other with respect to the through-hole 121h.

[0112] The curved surface portion 121c of the ferrite core 121 shown in Figures 4 and 5 may be arranged on the entire outer surface of the lower end portion 121b', but the curved surface portion 121c' of the ferrite core 121' in Figures 9 and 10 may be arranged on only a portion of the outer surface of the lower end portion 121b'.

[0113] The flat portion 121d may be disposed on each of the upper end portion 121a' and the lower end portion 121b', and may be connected to each other and disposed continuously. Here, the flat portion 121d disposed on the lower end portion 121b' may be disposed between two curved portions 121c' disposed facing each other on the outer surface of the lower end portion 121b'.

[0114] The ferrite core 121′ shown in Figures 9 and 10 can be alternatively applied to the stylus pens shown in Figures 9 to 26. In this case, the buffer member (not shown) may have a shape that can cover a portion of the lower end 121b′ of the ferrite core 121′.

[0115] Figure 11 is a cross-sectional view of a stylus pen to which another modified example of the ferrite core 121 shown in Figure 4 is applied, Figure 12 is a cross-sectional view showing only the ferrite core 121'' and the coil portion 123 shown in Figure 11, Figure 13 is an oblique view of the ferrite core 121'' shown in Figures 11 and 12, (a) of Figure 14 is an enlarged front view of a portion of the ferrite core 121'' shown in Figure 13, and (b) of Figure 14 is a cross-sectional view along B-B' in (a) of Figure 13.

[0116] 11 to 13, a ferrite core 121'' according to another modification includes an upper end 121a'' and a lower end 121b''.

[0117] The lower end 121b'' has a tapered shape, and the outer surface of the lower end 121b'' includes at least one step 121c''.

[0118] The step portion 121c'' may be disposed over the entire outer surface of the lower end portion 121b'', or may be disposed over a portion of the outer surface as shown in FIGS.

[0119] 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 penetration direction of the through hole 121h, and the third surface 121c3 may be a surface parallel to the penetration direction of the through hole 121h. The second surface 121c2 may connect the first surface 121c1 and the third surface 121c3. Here, although not shown in a separate drawing, the second surface 121c2 may be a curved surface that curves inward or outward.

[0120] The ferrite core 121'' has a cylindrical shape. A flat surface 121d may be arranged on at least a portion of the outer surface of the ferrite core 121''. A flat surface corresponding to the flat surface 121d may also be arranged on another portion of the outer surface of the ferrite core 121''. The flat surface 121d may allow the ferrite core 121'' to be stably arranged inside the housing.

[0121] The flat portion 121d may be disposed on each of the upper end portion 121a'' and the lower end portion 121b'', and these may be connected to each other and disposed continuously. Here, the flat portion 121d disposed on the lower end portion 121b'' may be disposed between two stepped portions 121c'' disposed facing each other on the outer surface of the lower end portion 121b''.

[0122] The ferrite core 121'' shown in FIGS. 11 to 14 includes the step portion 121c'' and can therefore have substantially the same or similar effects as the ferrite core 121 shown in FIGS.

[0123] The ferrite core 121'' shown in FIGS. 11 to 14 can also be applied to the stylus pens shown in FIGS. 9 to 26. In this case, the buffer member (not shown) may have a shape that can cover a portion of the lower end 121b'' of the ferrite core 121''.

[0124] Hereinafter, detailed structures of stylus pens to which the ferrite cores 121, 121', and 121'' according to various embodiments shown in FIGS. 4 to 14 can be applied will be described with reference to the accompanying drawings.

[0125] Figure 15 is an oblique view of a stylus pen 1000 according to another embodiment of the present invention, Figure 16 is a cross-sectional view of a portion of the stylus pen 1000 shown in Figure 15, and Figure 17 is an oblique view of the stylus pen 1000 shown in Figure 15 without the housing 1010.

[0126] 15 to 17, a housing 1010 forms the exterior of the stylus pen 1000. The housing 1010 has a predetermined space formed therein and is elongated in one direction. The housing 1010 may be formed by combining two or more parts together, or may be formed as a single, integrated part.

[0127] The housing 1010 may be made of a non-conductive synthetic resin material.

[0128] A button unit 1090 may be disposed on the housing 1010. The button unit 1090 may be for performing a specific operation of the stylus pen 1000. For example, the button unit 1090 may be a button for a cancel operation or a special skill operation.

[0129] The core 1020 includes one end disposed outside the housing 1010, and the remaining portion excluding the one end is disposed inside the housing 1010. Here, the one end of the core 1020 may also be called a pen tip.

[0130] The core 1020 may be made of a non-conductive material.

[0131] The core body 1020 may include a base portion 1021 and an outer shell portion 1025. The base portion 1021 has an elongated shape extending along the length of the stylus pen 1000. The outer shell portion 1025 surrounds the side of the base portion 1021. One side end of the base portion 1021 is exposed to the outside without being covered by the outer shell portion 1025. The outer shell portion 1025 is made of a material that is relatively stronger than the material of the base portion 1021, and reinforces and protects the base portion 1021.

[0132] An external force can move a portion of one end of the core body 1020 into the housing 1010. As the external force increases, the volume of the portion of the one end of the core body 1020 that enters the housing 1010 can increase. When the applied external force decreases, the portion of the one end of the core body 1020 moves out of the housing 1010 again. When the external force is removed, the portion of the one end of the core body 1020 returns to its original state.

[0133] 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 a portion adjacent to one end of the core body 1020 among both ends of the housing 1010, and has a shape in which the width and diameter become narrower toward the end of the one end of the housing 1010.

[0134] The buffer member 1150 has a conical or polygonal pyramid shape and has a through hole through which one end of the ferrite core 1210 and a body portion between one end and the other end of the core 1020 pass. The inner surface defining the through hole may have a shape corresponding to the outer surface of one end of the ferrite core 1210 and the outer surface of the body portion of the core 1020. Here, the body portion of the core 1020 refers to the portion of the core 1020 that is elongated in one direction and is disposed within the through hole of the ferrite core 1210.

[0135] The buffer member 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. The buffer member 1150 can block external electrical or magnetic influences.

[0136] The buffer member 1150 has a shape that covers one end of the ferrite core 1210 .

[0137] An imaginary tangent line that is commonly tangent to the tapered portion 1010t of the housing 1010 and the portion of the core 1020 (or the pen tip) disposed outside the housing 101 may form a predetermined angle as shown in Fig. 4. Here, the predetermined angle is preferably within 30°. If the predetermined angle is within 30°, there is an advantage that the stylus pen according to another embodiment of the present invention can be used for drawing while tilted at an angle of 60° with respect to the contact surface.

[0138] The inductor unit 1200 may form an LC resonator together with a capacitor unit (not shown). A resonant frequency may be set depending on the inductance L value of the inductor unit 1200 and the capacitance C value of the capacitor unit (not shown). The resonant frequency may be varied by changing the inductance L value of the inductor unit 1200 and / or the capacitance C value of the capacitor unit (not shown).

[0139] The inductor section 1200 includes a ferrite core 1210 and a coil section 1230 wound around the outer surface of the ferrite core 1210 .

[0140] The ferrite core 1210 may have an overall cylindrical, polycylindrical, or polygonal cylindrical shape, and may have a through-hole 1210h formed therethrough along the length of the ferrite core 1210. The ferrite core 1210 may be substituted for the ferrite cores 121, 121', and 121'' according to various embodiments shown in FIGS. 4 to 14.

[0141] The ferrite core 1210 includes iron (Fe), manganese (Mn), and zinc (Zn).

[0142] The ferrite core 1210 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). Preferably, the ferrite core 121 contains 70% by weight of iron (Fe), 18% by weight of manganese (Mn), and 12% by weight of zinc (Zn).

[0143] The ferrite core 1210 may be formed of iron (Fe), manganese (Mn), and zinc (Zn) having the composition ranges mentioned above at a firing temperature of 800 to 1800°C.

[0144] Depending on one or more of the material, manufacturing cost, and firing temperature of the ferrite core 1210, as mentioned in FIG. 2, there is an advantage that the magnetization effect is improved and the resonant frequency of the LC resonant part remains almost unchanged despite magnetization by an external magnetic material.

[0145] The ferrite core 1210 has a through-hole 1210h therein through which the body of the core 1020 passes. The body of the core 1020 can move linearly back and forth along the length direction via the through-hole 1210h.

[0146] One end of the ferrite core 1210 may have a tapered shape in which the diameter or width decreases toward the end. Here, the outer surface of the tapered end may include at least one curved portion 121c that is curved inward, as shown in FIG.

[0147] 5, the ferrite core 1210 may include an upper end 121a and a lower end 121b disposed below the upper end 121a. Here, the upper end 121a and the lower end 121b may be integrally formed.

[0148] The coil portion 1230 may be wound around the ferrite core 1210 in at least one layer.

[0149] The coil unit 1230 is electrically connected to the substrate 2100. The coil unit 1230 may include a first connecting unit 1231 and a second connecting unit 1232 for connection to the substrate 2100. The first connecting unit 1231 is disposed on the fixing bracket 1600, and an end thereof is electrically connected to a first terminal unit 2131 of the substrate 2100. The second connecting unit 1232 is disposed on the fixing bracket 1600, and an end thereof is electrically connected to a second terminal unit 2132 of the substrate 2100. Here, the fixing bracket 1600 may have grooves in which the first connecting unit 1231 and the second connecting unit 1232 are disposed. The grooves may be formed on the outer surface of the fixing bracket 1600 along the longitudinal direction of the stylus pen 1000. The grooves can guide the first connecting portion 1231 and the second connecting portion 1232 of the coil portion 1230, and have the advantage of protecting the first connecting portion 1231 and the second connecting portion 1232 from external impact.

[0150] 18 is a perspective view of only the fixing bracket 1600 shown in FIG. 17, FIG. 19 is a perspective view of the fixing bracket 1600 shown in FIG. 18 from another direction, and FIG. 20 is a partial perspective view of FIG. 17 from another direction.

[0151] 17 to 20 , the fixing bracket 1600 is fixedly disposed inside the housing 1010. The fixing bracket 1600 may be disposed between the inductor portion 1200 and the board bracket 1900 inside the housing 1010. One end of the fixing bracket 1600 may be coupled to the inductor portion 1200, and the other end of the fixing bracket 1600 may be coupled to the board bracket 1900.

[0152] One end of the fixing bracket 1600 may include an insertion groove 1620 into which the other end of the ferrite core 1210 of the inductor unit 1200 is inserted. The insertion groove 1620 may be defined by a first partition wall 1611 and an inner wall 1622 of the fixing bracket 1600.

[0153] The first partition wall 1611 can be in contact with the other end of the ferrite core 1210, and the first partition wall 1611 has a through-hole 1610 through which the core body 1020 passes.

[0154] The inner wall 1622 may include a number of protrusions 1621 protruding into the insertion groove 1620. The protrusions 1621 may contact the outer surface of the other end of the ferrite core 1210 to determine the position of the ferrite core 1210.

[0155] The other end of the fixing bracket 1600 may include locking holes 1660, 1665 into which the locking portions 1960, 1965 of the board bracket 1900 are inserted. There may be at least one locking hole 1660, 1665, and as shown in the drawings, one may be located on the upper side of the fixing bracket 1600 and one on the lower side. The locking portion 1960 of the board bracket 1900 is coupled to the locking hole 1660, so that the fixing bracket 1600 can be coupled to the board bracket 1900.

[0156] The other end of the fixing bracket 1600 may include a guide protrusion 1667. The guide protrusion 1667 may be formed to extend along the length of the fixing bracket 1600. The guide protrusion 1667 may be coupled to a guide portion 1967 of the base bracket 1900. By coupling the guide protrusion 1667 to the guide portion 1967 of the base bracket 1900, the fixing bracket 1600 can be positioned along the length of the stylus pen 1000.

[0157] The other end of the fixing bracket 1600 may include a second partition wall 1680. The second partition wall 1680 fixes the position of the elastic member 1800 together with the board bracket 1900. That is, the elastic member 1800 may be fixedly attached between the second partition wall 1680 and the board bracket 1900.

[0158] The fixed bracket 1600 is disposed to surround the moving bracket 1300, the elastic body 1700, and the elastic member 1800. The fixed bracket 1600 may have an internal storage space 1640 in which the moving bracket 1300, the elastic body 1700, and the elastic member 1800 are disposed. The storage space 1640 of the fixed bracket 1600 allows the moving bracket 1300 to move back and forth linearly.

[0159] The fixing bracket 1600 may include two or more electrode patterns 1690. At least two of the electrode patterns 1690 may be arranged on the outer surface of the fixing bracket 1600. For example, the electrode patterns 1690 may be arranged on each of the outer surfaces of both sides of the fixing bracket 1600. The electrode patterns 1690 may be plated on the outer surface of the fixing bracket 1600 made of a non-conductive material. For example, the electrode patterns 1690 may be formed on the outer surface of the non-conductive fixing bracket 1600 using laser direct structuring (LDS) and laser manufacturing antenna (LMA).

[0160] Grooves (or cavities) 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 in the grooves (or cavities). Although not shown in a separate drawing, in another embodiment, protrusions 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 protrusions.

[0161] The electrode pattern 1690 may be disposed around the guide hole 1630 of the fixed bracket 1600 and may have a concave-convex or V-shaped configuration. One end of the electrode pattern 1690 may be in contact with or spaced apart from the electrode pattern 1390 of the movable bracket 1300, and the other end of the electrode pattern 1690 may be electrically connected to terminal portions 2191 and 2192 of the substrate 2100.

[0162] According to the movement of the moving bracket 1300 synchronized with the movement of the core body 1020, the electrode pattern 1690 may contact the electrode pattern 1390 of the moving bracket 1300 or may be spaced a predetermined distance apart from the electrode pattern 1390 of the moving bracket 1300. This will be described later with reference to a separate drawing.

[0163] 21 is a perspective view of FIG. 17 excluding inductor section 1200 and fixing bracket 1600, FIG. 22 is a perspective view of FIG. 21 viewed from another direction, and FIG. 23 is a cross-sectional view of FIG.

[0164] 16 to 21, the moving bracket 1300 moves synchronously with the core body 1020. When one end of the core body 1020 receives an external force from the outside, the core body 1020 moves toward the inside of the housing 1010, and the moving bracket 1300 moves together with the core body 1020.

[0165] The moving bracket 1300 is configured to house the other end of the core body 1020, the magnetic body 1400, and the protective member 1500. The moving bracket 1300 may have a housing portion for housing the other end of the core body 1020, the magnetic body 1400, and the protective member 1500.

[0166] Inside the storage section, magnetic body 1400 and protective member 1500 are arranged to surround the other end of core body 1020. For this reason, magnetic body 1400 can be cylindrical and have a through-hole inside through which the other end of core body 1020 passes, and protective member 1500 can be cylindrical and have a through-hole inside through which the other end of core body 1020 passes.

[0167] The magnetic body 1400 includes a magnetic substance and moves together with the core body 1020 in synchronization with the movement of the core body 1020. The movement of the magnetic body 1400 changes the distance between the magnetic body 1400 and the inductor unit 1200 fixedly disposed inside the housing 1010. The change in distance changes the inductance of the inductor unit 1200.

[0168] The protective member 1500 includes an elastic material and may be disposed sandwiched between the other end of the core body 1020 and the moving bracket 1300. The other end of the core body 1020 may be protected by the protective member 1500, and since the protective member 1500 is sandwiched between the other end of the core body 1020 and the moving bracket 1300, the movement of the core body 1020 can be synchronized with the moving bracket 1300.

[0169] 20, the protection member 1500 may include a protrusion 1510 protruding outward from the outer surface. The protrusion 1510 may be sandwiched in an insertion groove 1310 formed in the movable bracket 1300. The protection member 1500 may be stably fixed to the movable bracket 1300 by the protrusion 1510 of the protection member 1500 and the insertion groove 1310 of the movable bracket 1300, and thus the other end of the core body 1020 may be fixed to the movable bracket 1300.

[0170] The moving bracket 1300 may include a first protrusion 1330a and a second protrusion 1330b. The first protrusion 1330a and the second protrusion 1330b may protrude outward from the outer surface of the moving bracket 1300 or in a direction perpendicular to the longitudinal direction of the stylus pen 1000. The first protrusion 1330a and the second protrusion 1330b may be disposed in a guide hole 1630 of the fixed bracket 1600 shown in FIG. 17. When the moving bracket 1300 moves in synchronization with the movement of the core body 1020, the first protrusion 1330a and the second protrusion 1330b can move along the guide hole 1630 of the fixed bracket 1600.

[0171] The moving bracket 1300 may include a third protrusion 1350. The third protrusion 1350 may protrude outward from the outer surface of the moving bracket 1300 or in a direction perpendicular to the longitudinal direction of the stylus pen 1000. The third protrusion 1350 may be disposed in a guide hole 1650 of the fixed bracket 1600 shown in FIG. 17. When the moving bracket 1300 moves in synchronization with the movement of the core body 1020, the third protrusion 1350 may move along the guide hole 1650 of the fixed bracket 1600.

[0172] The moving bracket 1300 may include an extension 1370. The extension 1370 may extend along the length of the stylus pen 1000 on the outer surface of the moving bracket 1300. Alternatively, the extension 1370 may extend along the length of the core body 1020 on the outer surface of the moving bracket 1300. The extension 1370 may have a structure and shape that allows it to be disposed inside the elastic body 1700. An extension 1870 of the elastic member 1800 may be disposed on the end of the extension 1370.

[0173] The moving bracket 1300 may include an electrode pattern 1390. The electrode pattern 1390 may be disposed on the outer surface of the moving bracket 1300 on which the extension portion 1370 is formed and on the first and second protrusions 1330a and 1330b.

[0174] The electrode pattern 1390 may be in contact with and electrically connected to the elastic body 1700 surrounding the extension 1370 of the moving bracket 1300. The electrode pattern 1390 may be in contact with and electrically connected to the electrode pattern 1690 of the fixed bracket 1600 shown in FIG. 17, and may be electrically isolated from the electrode pattern 1690 of the fixed bracket 1600 by movement of the core body 1020.

[0175] The electrode pattern 1390 may be plated on the outer surface of the non-conductive moving bracket 1300. For example, the electrode pattern 1390 may be formed on the outer surface of the non-conductive moving bracket 1300 using laser direct structuring (LDS) and laser manufacturing antenna (LMA).

[0176] The electrode pattern 1390 may include a base electrode pattern 1391 and first and second extension patterns 1393a and 1393b.

[0177] The base electrode pattern 1391 may be disposed on the outer surface of the moving bracket 1300 and may be disposed so as to surround the extension portion 1370 of the moving bracket 1300. The base electrode pattern 1391 contacts one end of the elastic body 1700.

[0178] The first and second extension patterns 1393a and 1393b may extend from both sides of the first electrode pattern 1391, with the first extension pattern 1393a being disposed on the first protrusion 1330a and the second extension pattern 1393b being disposed on the second protrusion 1330b. The first and second extension patterns 1393a and 1393b may come into contact with the electrode pattern 1690 of the fixing bracket 1600 shown in FIG. 17 or may be released from contact with the electrode pattern 1690 due to movement of the core body 1020.

[0179] The elastic body 1700 may be made of a conductive material and have a spring shape. The elastic body 1700 may be disposed between the moving bracket 1300 and the elastic member 1800. Here, the elastic body 1700 may be sandwiched between the moving bracket 1300 and the elastic member 1800 in a partially compressed state rather than a fully compressed state. If the external force applied to the moving bracket 1300 synchronized with the movement of the core body 1020 is smaller than the elastic force pushing outward from the partially compressed elastic body 1700, the elastic body 1700 will not be compressed, but if the external force is greater than the elastic force, the elastic body 1700 will begin to be compressed.

[0180] The extension 1370 of the moving bracket 1300 and the extension 1870 of the elastic member 1800 may be disposed together inside the elastic body 1700. This allows the internal space of the elastic body 1700 to be utilized, which has the advantage of reducing the internal volume of the stylus pen 1000.

[0181] One end of the elastic body 1700 is electrically connected to the electrode pattern 1390 of the moving bracket 1300, and the other end is electrically connected to the terminal portion 2110 of the substrate 2100. The elastic body 1700 may include a connecting wire 1710 connecting the elastic body 1700 and the terminal portion 2110 of the substrate 2100. One end of the connecting wire 1710 may be connected to the elastic body 1700, and the other end may be connected to the terminal portion 2110 of the substrate 2100. In order to protect and guide the connecting wire 1710, the elastic member 1800 and the substrate bracket 1900 may have a guide groove in which the connecting wire 1710 is disposed.

[0182] The elastic member 1800 is made of a non-conductive material and has a predetermined elasticity. For example, the elastic member 1800 may be rubber.

[0183] The elastic member 1800 may be disposed between the moving bracket 1300 and the base bracket 1900 .

[0184] 24 is a perspective view of only the elastic member 1800 shown in FIG. 21, and FIG. 25 is a perspective view of the board bracket 1900 and the board 2100 shown in FIG.

[0185] 18 to 25, the elastic member 1800 may include an extension 1870. The extension 1870 may extend in the direction of the moving bracket 1300 on the outer surface of the elastic member 1800. The extension 1870 may be disposed inside the elastic body 1700.

[0186] The elastic member 1800 may include a guide groove 1810. The guide groove 1810 may be formed on the outer surface of the elastic member 1800 along the length direction of the stylus pen 1000. The connecting line 1710 of the elastic body 1700 may be disposed in the guide groove 1810.

[0187] The elastic member 1800 may include a mounting groove 1850. The mounting groove 1850 may be formed on an outer surface of the elastic member 1800. The mounting groove 1850 may be disposed on a side opposite the extension portion 1870. The mounting portion 1910 of the board bracket 1900 may be inserted into the mounting groove 1850. A locking groove 1851 having a shape corresponding to the protrusion 1915 of the mounting portion 1910 of the board bracket 1900 may be formed inside the mounting groove 1850. This allows the elastic member 1800 to be stably and securely mounted to the board bracket 1900.

[0188] The board bracket 1900 supports the board 2100 inside the housing 1010 and is coupled to the elastic member 1800 to support the elastic member 1800 .

[0189] The substrate bracket 1900 may include sides 1940 that guide and support the sides of the substrate 2100 .

[0190] The board bracket 1900 may include mounting portions 1910 for coupling with the elastic member 1800. The mounting portions 1910 protrude from the board bracket 1900 in a direction toward the moving bracket 1300. The mounting portions 1910 may include protrusions 1915 protruding from the outer surface. The protrusions 1915 may protrude in a direction perpendicular to the direction in which the mounting portions 1910 protrude.

[0191] The board bracket 1900 may include a guide groove 1920. The guide groove 1920 can guide and protect the connecting wire 1710 of the elastic body 1700.

[0192] The substrate 2100 is placed on the substrate bracket 1900 .

[0193] The substrate 2100 may include a number of terminal portions 2110, 2131, 2132, 2191, and 2192. Of the number of terminal portions 2110, 2131, and 2132, the terminal portion 2110 is electrically connected to the elastic body 1700, and the first and second terminal portions 2131 and 2132 are electrically connected to the coil portion 1230 of the inductor portion 1200. The third and fourth terminal portions 2191 and 2192 are electrically connected to electrode patterns 1690 disposed on both sides of the outer surface of the fixing bracket 1600.

[0194] The substrate 2100 includes a capacitor unit (not shown). One or more capacitors constituting the capacitor unit (not shown) may be disposed on the substrate 2100.

[0195] The substrate 2100 may include a circuit pattern that electrically connects one or more capacitors in a capacitor unit (not shown) to a number of terminal units 2110, 2131, and 2132.

[0196] FIG. 26 is a diagram illustrating the movement of the moving bracket 1300 in accordance with the movement of the core body 1020 shown in FIGS. 17 to 25, and the electrical contact and release between the fixed bracket 1600 and the moving bracket 1300.

[0197] (a) of Figure 26 shows the state when no external force is applied to the core body 1020, and (b) of Figure 26 shows the state when a predetermined external force is applied to the core body 1020 and the moving bracket 1300 moves in one direction.

[0198] 26(a), when no external force is applied to the core body 1020, the electrode pattern 1390 of the movable bracket 1300 contacts 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.

[0199] The second protrusion 1330b of the movable bracket 1300 is pushed toward the core body 1020 by the elastic body 1700, so that the electrode pattern 1390 arranged on the outer surface of the second protrusion 1330b can be maintained in contact with the electrode pattern 1690 of the fixed bracket 1600.

[0200] 26(b), when a predetermined external force is applied to the core body 1020 and the core body 1020 moves in one direction, the movable bracket 1300 moves in that direction in conjunction with the core body 1020. As the movable bracket 1300 moves in that direction, the second protrusion 1330b also moves in that direction. As the second protrusion 1330b moves, the electrode pattern 1390 of the movable bracket 1300 is released from contact with the electrode pattern 1690 of the fixed bracket 1600. Similarly, the first protrusion 1330a located on the opposite side of the second protrusion 1330b also moves, and the electrode pattern 1390 of the movable bracket 1300 is released from contact with the electrode pattern 1690 of the fixed bracket 1600. Then, the movement of the movable bracket 1300 compresses the elastic body 1700.

[0201] 26(b), when a predetermined external force is applied to the core body 1020 and the core body 1020 moves in one direction, the contact between the electrode pattern 1390 of the movable bracket 1300 and the electrode pattern 1690 of the fixed bracket 1600 is released. This release of contact changes the capacitance of a capacitor unit (not shown) mounted on the substrate 2100. This change in capacitance changes the frequency of the pen signal emitted from the stylus pen 1000. A receiving side that receives the pen signal can detect the changed frequency and determine that the stylus pen 1000 has contacted the screen.

[0202] As the movable bracket 1300 moves, the magnetic body 1400 disposed inside the movable bracket 1300 also moves. The movement of the magnetic body 1400 increases the distance between the inductor unit 1200 and the magnetic body 1400. The change in the distance between the inductor unit 1200 and the magnetic body 1400 changes the inductance of the inductor unit (not shown). The change in inductance occurs together with the change in capacitance described above. Here, the change in capacitance can be configured to be more dominant than the change in inductance. It is easier to suddenly change capacitance than suddenly change in inductance in the limited space inside the housing of a stylus pen. However, in some cases, the change in inductance can be configured to be more dominant than the change in capacitance. Alternatively, the change in capacitance and the change in inductance can be configured to have similar characteristics. In any of the three cases above, both the capacitance and inductance change as the moving bracket 1300 moves, and the change in capacitance and inductance causes a change in the resonant frequency of the resonant circuit formed by the inductor unit 1200 and the capacitor unit. This change in the resonant frequency can be detected by the receiving side that receives the pen signal, and it can be determined that the stylus pen 1000 has contacted the screen.

[0203] FIG. 27 is a schematic diagram of each of (a) and (b) in FIG. 26, and FIG. 28 is a simplified equivalent circuit diagram of each of (a) and (b) in FIG. 26 of a stylus pen according to another embodiment of the present invention.

[0204] 27 and 28(a) and 28(b), a plurality of capacitors C1, C2, C3, and Cs are disposed on a substrate 2100. The plurality of capacitors C1, C2, C3, and Cs may constitute a capacitor unit (not shown). At least one of the plurality of capacitors C1, C2, C3, and Cs is connected in parallel to each other to maintain a constant capacitance value, and an auxiliary capacitor Cs is connected in parallel to the basic capacitor or is not connected to the basic capacitor depending on whether or not the electrode pattern 1690 of the fixed bracket 1600 and the electrode pattern 1390 of the movable bracket 1300 contact or contacts each other.

[0205] 27(a) and 28(a), when no external force is applied to the core 1020, the electrode pattern 1690 of the fixed bracket 1600 and the electrode pattern 1390 of the movable bracket 1300 are in contact with each other, so that the auxiliary capacitor Cs is connected in parallel with the basic capacitors C1, C2, and C3. Therefore, the capacitance of the capacitor unit (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.

[0206] 27(b) and 28(b), when a predetermined external force is applied to the core body 1020, the movement of the movable bracket 1300 synchronized with the movement of the core body 1020 causes the electrode pattern 1390 of the movable bracket 1300 to be released from contact with the electrode pattern 1690 of the fixed bracket 1600. Therefore, the auxiliary capacitor Cs cannot be electrically connected to the basic capacitors C1, C2, and C3, and the capacitance of the capacitor unit (not shown) is changed to the capacitance value of the basic capacitors C1, C2, and C3.

[0207] 28(b), it can be seen 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 locations. This can be understood from the fact that the fixed bracket 1600 has two electrode patterns 1690 and the first and second extension patterns 1393a and 1393b are disposed on the first and second protrusions 1330a and 1330b of the movable bracket 1300, as shown in FIGS.

[0208] If the external force applied to the core body 1020 is not strong enough to separate all of the first and second extension patterns 1393a, 1393b from the two electrode patterns 1690 of the fixing bracket 1600, i.e., if the first extension pattern 1393a separates from one electrode pattern 1690 of the fixing bracket 1600 but the second extension pattern 1393b does not separate from the other remaining electrode pattern 1690 of the fixing bracket 1600, the auxiliary capacitor Cs will still maintain a parallel connection with the basic capacitors C1, C2, and C3.

[0209] On the other hand, the auxiliary capacitor Cs is electrically disconnected from the basic capacitors C1, C2, and C3 only when the external force applied to the core body 1020 reaches a level that completely separates all of the first and second extension patterns 1393a and 1393b from the two electrode patterns 1690 of the fixing bracket 1600. Therefore, when using the stylus pen 1000 according to another embodiment of the present invention, it is possible to clearly set a reference pressure that distinguishes between hover and contact, which is advantageous in that the distinction between hover and contact can be clearly established. In particular, even if one of the first and second extension patterns 1393a, 1393b does not contact one of the two electrode patterns 1690 of the fixing bracket 1600 due to a problem in the manufacturing process or carelessness on the part of the user during the manufacture of the stylus pen, the stylus pen 1000 according to another embodiment of the present invention can still maintain a contact state with one electrode pattern different from the other extension pattern, thereby providing the advantage of clearly distinguishing between the hover state and the contact state.

[0210] Figure 29 is an oblique view of a stylus pen 1000 according to another embodiment of the present invention shown in Figure 15, viewed from the side of the core body 1020, (a) of Figure 30 is a portion of a cross-sectional view of the stylus pen 1000 shown in Figure 29 taken along line A-A', (b) of Figure 30 is a portion of a cross-sectional view of the stylus pen 1000 shown in Figure 29 taken along line B-B', and Figure 31 is a drawing showing side views A and B and a cross-sectional view of the ferrite core 1210 shown in Figures 29 and 30.

[0211] Referring to Figures 17, 29 to 31, the housing 1010 of the stylus pen 1000 has a rectangular shape with rounded corners, and the portion of the housing 1010 where a portion of the core body 1020 is exposed has a shape in which its width becomes narrower as it goes outward.

[0212] The components arranged inside the housing 1010 also correspond to the shape of the housing 1010. Among the internal components, the ferrite core 1210 of the inductor unit 1200 also has an optimized structure corresponding to the shape of the housing 1010.

[0213] As shown in Figures 30(a) and 30(b), the ferrite core 1210 has a first cross-sectional shape cut in a first vertical direction (direction A-A' in Figure 29) perpendicular to the axial direction (x, or the length direction of the stylus pen 1000) of the ferrite core 1210, which is different from a second cross-sectional shape cut in a second vertical direction (direction B-B' 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 smaller than the thickness w2 in the second vertical direction. Here, the thickness w1 in the first vertical direction may be defined as the shortest distance from the through hole 1210h of the ferrite core 1210 to the outer surface of the ferrite core 1210 in the first cross-sectional shape, and the thickness w2 in the second vertical direction may be defined as the shortest distance from the through hole 1210h of the ferrite core 1210 to the outer surface of the ferrite core 1210 in the second cross-sectional shape. Alternatively, different from what is shown in the drawings, the thickness w1 in the first vertical direction may be the entire thickness of the ferrite core 1210 in the first cross-sectional shape, and the thickness w2 in the second vertical direction may be the entire thickness of the ferrite core 1210 in the second cross-sectional shape.

[0214] The ferrite core 1210 has a tube or cylindrical shape. A flat surface 1210d may be arranged on at least a portion of the outer surface of the ferrite core 1210. A flat surface corresponding to the flat surface 1210d may also be arranged on another portion of the outer surface of the ferrite core 1210. The flat surface 1210d allows the ferrite core 1210 to be stably arranged inside the housing 1010. The flat surface 1210d is formed to extend from one end to the other end of the ferrite core 1210 along the axial direction x of the ferrite core 1210.

[0215] One end of the ferrite core 1210 may include at least two curved portions 1210c. At least a portion of the curved portions 1210c may appear in the second cross-sectional shape but not in the first cross-sectional shape, as shown in (a) and (b) of Figures 30A and 30B. The curved portions 1210c may be curved from one side surface of one end of the ferrite core 1210 toward the through hole 1210h to a portion of the ferrite core 1210 adjacent to the through hole 1210h. Such curved portions 1210c may be arranged on both sides of the through hole 1210h that face each other at one end of the ferrite core 1210.

[0216] As shown by circled numbers 1, 2, and 3 in Fig. 31, the curved surface portion 1210c changes from an aspherical shape to a spherical shape as it moves in the axial direction x of the ferrite core 1210. The circled number 3 in Fig. 31 indicates that the curved surface portion 1210c has an aspherical shape, and the circled number 1 in Fig. 31 indicates that the curved surface portion 1210c has a spherical shape. And the circled number 2 in Fig. 31 indicates that the curved surface portion 1210c has an intermediate shape between the aspherical and spherical shapes.

[0217] At one end of the ferrite core 1210, the flat portion 1210d has a shape in which its width gradually narrows toward the axial direction x of the ferrite core 1210. Here, the width of the flat portion 1210d may decrease nonlinearly.

[0218] 6 to 8, the use of the ferrite core 1210 allows the inductor unit 1200 including the ferrite core 1210 to be positioned closer to the tip of the core 1020 inside the stylus pen 1000. Therefore, the inductor unit 1200 can be positioned closer to the receiver (not shown), which has the advantage of increasing the magnitude of the pen signal received by the receiver.

[0219] FIG. 32 is a diagram illustrating a modified example of the ferrite core 1210 shown in FIG. 31, and FIG. 33 is a perspective view of an inductor section 1200′ in which a coil 1230′ is wound on the outer surface of the ferrite core 1210′ shown in FIG. 32.

[0220] Referring to FIG. 32, the ferrite core 1210' has a cylindrical shape.

[0221] One end of the ferrite core 1210′ may include a curved portion 1210c′. The curved portion 1210c′ may be a curved surface that curves in the direction of the through-hole 1210h from one end of the ferrite core 1210′ to a portion of the ferrite core 1210′ adjacent to the through-hole 1210h.

[0222] The ferrite core 1210' has a through hole 1210h that penetrates along the axial direction x. The through hole 1210h may have a constant diameter from one end to the other end.

[0223] As shown by circled numbers 1, 2, and 3 in Fig. 32, the curved portion 1210c' has a constant inner diameter and an outer diameter that decreases toward the axial direction x of the ferrite core 1210'. Here, the inner diameter defines the through hole 1210h. Alternatively, as shown by circled numbers 1, 2, and 3 in Fig. 32, the thickness between the outer diameter and the inner diameter of the curved portion 1210c' gradually decreases toward the axial direction x of the ferrite core 1210'.

[0224] The rate at which the outer diameter or the thickness (between the outer diameter and the inner diameter) decreases along the axial direction x of the ferrite core 1210' may be nonlinear. More specifically, when one end of the ferrite core 1210' is divided into an upper section (the portion marked with a circled number 3), a middle section (the portion marked with a circled number 2), and a lower section (the portion marked with a circled number 1), the rate at which the outer diameter or the thickness decreases from the upper section to the middle section may be relatively greater than the rate at which the outer diameter or the thickness decreases from the middle section to the lower section. In other words, the rate at which the outer diameter or the thickness decreases from the upper section to the middle section may be relatively steep, and the rate at which the outer diameter or the thickness decreases from the middle section to the lower section may be relatively gradual.

[0225] Referring to FIG. 33, a coil 1230' can be wound around the outer surface (or peripheral surface) of a ferrite core 1210'.

[0226] The inductor unit 1200' including the ferrite core 1210' and the coil 1230' may be disposed inside a cylindrical housing (not shown) other than the housing 1000 shown in Fig. 29. Although not shown in a separate drawing, the ferrite core of the inductor unit may have a shape corresponding to the internal shape of the housing.

[0227] The features, structures, effects, etc. described in the above embodiments are included in one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects, etc. exemplified in each embodiment can be combined or modified in other embodiments by a person skilled in the art to which the embodiment belongs. Therefore, content related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

[0228] Furthermore, although the above description has focused on the embodiments, these are merely examples and do not limit the present invention. Those skilled in the art will recognize that various modifications and applications other than those illustrated above are possible within the scope of the essential characteristics of the present invention. For example, each component specifically illustrated in the embodiments can be modified and implemented. Differences related to such modifications and applications should be construed as being included within the scope of the present invention as defined in the appended claims.

Claims

1. In the ferrite core installed inside the stylus pen, The ferrite core contains 60 to 80 (wt%) iron (Fe), 15 to 30 (wt%) manganese (Mn), and 3 to 20 (wt%) zinc (Zn).

2. The ferrite core according to claim 1 , wherein the ferrite core is manufactured at a firing temperature of 800 to 1800° C.

3. the ferrite core has a through hole formed along the length of the stylus pen; the ferrite core has a first cross-sectional shape in a first perpendicular direction perpendicular to the length direction, and a second cross-sectional shape in a second perpendicular direction perpendicular to the length direction and the first perpendicular direction, the first cross-sectional shape is different from the second cross-sectional shape; the ferrite core includes a curved surface portion disposed at one end of the ferrite core, The curved surface portion includes at least two curved surfaces curved in a direction toward the through hole from one side surface of one end of the ferrite core to a portion of the ferrite core adjacent to the through hole. The ferrite core according to claim 1 .

4. a thickness of the ferrite core in the first vertical direction in the first cross-sectional shape is smaller than a thickness of the ferrite core in the second vertical direction in the second cross-sectional shape; The ferrite core according to claim 3 , wherein at least a part of the curved surface portion appears only in the second cross-sectional shape.

5. The ferrite core according to claim 3 , wherein the curved surface portion is configured so that the shape of the curved surface portion changes from an aspherical shape to a spherical shape as it goes toward the one end portion at the other end portion of the ferrite core.

6. a flat portion disposed on a portion of an outer surface of the ferrite core and formed between both ends of the ferrite core along the length direction; 4. The ferrite core according to claim 3, wherein the width of the flat portion at one end of the ferrite core is gradually narrowed toward one end of the ferrite core.

7. Housing and a core body having one end disposed outside the housing and the remainder disposed inside the housing, the core body being configured to move along a length direction in response to an external force acting on the one end; an inductor portion disposed inside the housing and including a ferrite core having a through hole through which the core passes and a coil wound on an outer surface of the ferrite core; a fixing bracket fixedly disposed within the housing and coupled to the other end of the ferrite core; a moving bracket disposed within the fixed bracket, surrounding the other end of the core body, and configured to move in conjunction with the core body to synchronize with the movement of the core body; The ferrite core contains 60 to 80 (wt%) iron (Fe), 15 to 30 (wt%) manganese (Mn), and 3 to 20 (wt%) zinc (Zn). Stylus pen.

8. the ferrite core has a first cross-sectional shape in a first perpendicular direction perpendicular to the length direction, and a second cross-sectional shape in a second perpendicular direction perpendicular to the length direction and the first perpendicular direction, the first cross-sectional shape is different from the second cross-sectional shape; the ferrite core includes a curved surface portion disposed at one end of the ferrite core, The stylus pen according to claim 7 , wherein the curved surface portion includes at least two curved surfaces that are curved in a direction toward the through-hole from one side surface of one end of the ferrite core to a portion of the ferrite core adjacent to the through-hole.

9. The stylus pen according to claim 8 , further comprising a magnetic body disposed inside the moving bracket, surrounding the other end of the core body, and interlocking with the moving bracket.

10. The stylus pen according to claim 9 , further comprising a protective member disposed inside the moving bracket, surrounding the other end of the core body together with the magnetic body, and biasing the core body between the core body and the moving bracket.

11. a base bracket fixedly disposed within the housing and coupled to the other end of the fixed bracket; The stylus pen according to claim 7 , further comprising: a substrate on which a capacitor portion that forms a resonant circuit with the inductor portion is disposed, the substrate being attached to the substrate bracket.

12. an elastic member disposed inside the fixed bracket and attached to the base bracket; an elastic body disposed inside the fixed bracket and between the moving bracket and the elastic member, The elastic body has a hollow interior, At least a portion of the moving bracket and at least a portion of the elastic member are in contact with each other and are disposed in the hollow of the elastic body. The stylus pen according to claim 11.

13. the fixing bracket includes a pair of electrode patterns arranged on an outer surface thereof so as to face each other; the moving bracket includes an electrode pattern that contacts or moves away from the pair of electrode patterns according to the movement of the core body; The elastic body is made of a conductive material, One end of the elastic body is connected to the electrode pattern of the moving bracket, the other end of the elastic body is connected to a first terminal of the substrate; The stylus pen according to claim 12 , wherein a pair of electrode patterns of the fixing bracket are respectively connected to second and third terminals of the substrate.

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

15. The pair of electrode patterns of the fixing bracket are plated in grooves formed on the outer surface of the fixing bracket, The stylus pen of claim 13 , wherein the electrode pattern of the moving bracket is plated into grooves formed in the outer surface of the moving bracket.

16. The stylus pen of claim 11 , wherein movement of the moving bracket synchronized with movement of the core changes the resonant frequency of the resonant circuit.

17. The stylus pen of claim 16 , wherein, when the hover state and the touch state of the stylus pen are distinguished, the capacitance of the capacitor unit changes more predominantly than the inductance of the inductor unit.

18. a thickness of the ferrite core in the first vertical direction in the first cross-sectional shape is smaller than a thickness of the ferrite core in the second vertical direction in the second cross-sectional shape; The stylus pen according to claim 8 , wherein at least a part of the curved surface portion appears only in the second cross-sectional shape.

19. The stylus pen according to claim 7 , wherein the curved surface of the ferrite core is configured to change from an aspherical shape to a spherical shape at the other end of the ferrite core toward the one end.

20. a flat portion disposed on a portion of an outer surface of the ferrite core and formed between both ends of the ferrite core along the length direction; The stylus pen according to claim 7 , wherein the width of the flat portion at one end of the ferrite core is gradually narrowed toward one end of the ferrite core.

Images