Ferrite cores and stylus pens including the same

Abstract

To provide a ferrite core optimized for a housing having a specific shape and a stylus pen including the same.SOLUTION: A ferrite core according to an embodiment of the present invention, which is mounted inside a stylus pen, as a ferrite core having a through hole formed along a longitudinal direction of the stylus pen, includes a first cross-sectional shape in a first perpendicular direction perpendicular to the longitudinal direction, and a second cross-sectional shape in a second perpendicular direction perpendicular to the longitudinal direction and the first perpendicular direction. The first cross-sectional shape is different from the second cross-sectional shape, and the ferrite core includes a curved surface portion disposed at one end of the ferrite core, and the curved surface portion includes at least two curved surfaces curved toward a through hole side direction from one side surface of the one end of the ferrite core to a portion adjacent to the through hole of the ferrite core.SELECTED DRAWING: Figure 49

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 for a stylus pen that can improve the magnitude of a pen signal received at a receiver side, 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 to drag or click. Users use a stylus pen for precise touch input.

[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] Active stylus pens have the advantage of being superior in basic performance compared to passive stylus pens and being able to provide additional functions (pressure, hovering, buttons), but they have the disadvantage of being expensive and requiring a power source to charge the battery, so they are not widely used except by some advanced users.

[0005] Passive stylus pens have the advantages of being cheaper than active stylus pens and not requiring batteries, but they have the disadvantage of being less capable of precise touch recognition than active stylus pens. However, recently, two technologies have been proposed to realize passive stylus pens that can achieve precise touch recognition: the inductive resonance method, Electro Magnetic Resonance (EMR), and the capacitive resonance method.

[0006] The EMR method has superior quality in writing / drawing, which is the core function of a stylus pen, but has the disadvantage of being thick and costly because a separate EMR sensor panel and EMR driver IC must be added in addition to the capacitance touch panel.

[0007] The capacitive resonance method uses a general capacitance touch sensor and touch controller IC, and supports pen touch by improving the performance of the IC without any additional costs.

[0008] In the EMR or capacitive resonance method, in order for a touch sensor to accurately identify a touch by a stylus pen, the amplitude of the resonance signal must be large, and therefore the frequency of the drive signal transmitted to the stylus pen must be approximately the same as the resonance frequency of the resonant circuit built into the stylus pen. However, with conventional EMR or capacitive resonance methods, even if the resonance frequency and the drive signal frequency match, there is a problem of significant signal attenuation making signal transmission difficult. As a result, despite many years of attempts by many touch controller IC vendors, a sufficient output signal has not been achieved, and no vendor has yet succeeded in mass production.

[0009] Therefore, in order to manufacture an EMR or capacitive resonant stylus pen that can generate the maximum output signal, how to design the internal resonant circuit and the pen structure is a very important factor.

[0010] FIGS. 1(a) to 1(c) are diagrams for explaining one requirement of a conventional stylus pen.

[0011] The appearance design of conventional stylus pens, including the stylus pens 10a and 10b shown in FIGS. 1(a) to 1(c), must meet certain requirements in consideration of the user's environment.

[0012] One of the requirements is that the conventional stylus pens 10a and 10b must be capable of drawing when tilted at a predetermined angle (for example, 60°) with respect to a predetermined contact surface 31.

[0013] In particular, with some conventional stylus pens 10a, 10b, when a certain force F is applied after contacting the surface of the display panel 300, the pen tip is pushed and a part of it enters the housing 19. However, even when the pen tip is pushed and tilted at a certain angle (e.g., 60°) in this manner, some stylus pens 10a, 10b should be able to draw without any problems.

[0014] That is, when the conventional stylus pens 10a and 10b are tilted relative to the contact surface 31, the external mechanisms (eg, housing 19) of the stylus pens 10a and 10b must not prevent the stylus pens 10a and 10b from tilting at a predetermined angle (eg, 60°).

[0015] FIG. 2 is a diagram showing a simplified internal structure of a conventional stylus pen.

[0016] The conventional stylus pens 10c and 10d shown in Fig. 2 are composed of a pen tip 11, inductor sections 13 and 13', a capacitor section 15, and a housing 19. In addition to these, there are also other additional components.

[0017] The inductor sections 13, 13' are composed of ferrite cores 131, 131' and a coil 133. The pen tip 11 has a structure in which a part of it is inserted into the through-hole of the ferrite cores 131, 131'.

[0018] The inductor units 13, 13' and the capacitor unit 15 are electrically connected to each other to form an LC resonator unit, which can resonate with a drive signal provided from a transmitter located outside the stylus pens 10c, 10d and is configured to emit a predetermined signal (hereinafter referred to as a pen signal) through resonance.

[0019] The shape of the ferrite core 131' of the inductor unit 13' of the stylus pen 10d shown on the right side of Figure 2 is different from the ferrite core 131 of the inductor unit 13 of the stylus pen 10c shown on the left side. Specifically, the ferrite core 131' of the stylus pen 10d shown on the right side has a shape in which the width becomes narrower as it goes downward (hereinafter referred to as a tapered shape). This tapered shape allows the ferrite core 131' to be positioned closer to the lower end side (or pen tip side) within the housing 19 by a predetermined length H.

[0020] In the conventional stylus pens 10c and 10d shown in Fig. 2, the magnitude of the pen signal received at a receiver located outside the stylus pens 10c and 10d may vary depending on the position of the inductor units 13 and 13' within the housing 19. If possible, it is preferable to determine the position of the inductor units 13 and 13' so that the magnitude of the pen signal is increased.

[0021] 2, the ferrite core 131' of the stylus pen 10d shown on the right side is positioned closer to the end of the pen than the ferrite core 131 of the stylus pen 10c shown on the left side, so the magnitude of the pen signal received by the receiver is relatively larger. However, the tapered shape of the ferrite core 131' of the stylus pen 10d shown on the right side has limitations in maximizing the magnitude of the pen signal received by the receiver.

[0022] Furthermore, it is also important to maximize the magnitude of the pen signal received at the receiver side, while at the same time stably storing the inductor sections 13, 13' inside the housing 19. Summary of the Invention [Problem to be solved by the invention]

[0023] SUMMARY OF THE INVENTION An object of the present invention is to provide a ferrite core that is optimized for a housing having a specific shape, and a stylus pen including the same.

[0024] Another object of the present invention is to provide a ferrite core capable of increasing the magnitude of a pen signal received by a receiver, and a stylus pen including the ferrite core.

[0025] Another object of the present invention is to provide a ferrite core and a stylus pen including the same, which can clearly distinguish between the hover state and the contact state of the stylus pen.

[0026] Another object of the present invention is to provide a ferrite core capable of synchronizing a magnetic body with the movement of a core body, and a stylus pen including the ferrite core.

[0027] Another object of the present invention is to provide a ferrite core capable of electrically connecting electrical elements without using wires inside, and a stylus pen including the same.

[0028] Another object of the present invention is to provide a ferrite core that can reduce the size of a stylus pen, and a stylus pen including the ferrite core.

[0029] Another object of the present invention is to provide a ferrite core that allows an inductor portion to be stably housed inside a housing, and a stylus pen including the ferrite core.

[0030] Another object of the present invention is to provide a ferrite core that allows drawing even when tilted at a predetermined angle, and a stylus pen that includes the ferrite core. [Means for solving the problem]

[0031] A ferrite core according to an embodiment of the present invention is a ferrite core that is mounted inside a stylus pen and has a through hole formed along the longitudinal direction of the stylus pen, wherein the ferrite core has a first cross-sectional shape in a first vertical direction perpendicular to the longitudinal direction and a second cross-sectional shape in a second vertical direction perpendicular to the longitudinal direction and the first vertical direction, the first cross-sectional shape being different from the second cross-sectional shape, and the ferrite core includes a curved portion disposed at one end of the ferrite core, and the curved portion includes at least two curved surfaces curved toward 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.

[0032] A stylus pen according to an embodiment of the present invention includes a housing, a core body having one end disposed outside the housing and the other end disposed inside the housing and configured to move along a longitudinal direction in response to an external force acting on the one end, an inductor unit disposed inside the housing and including a ferrite core having a through hole through which the core body passes and a coil wound on an outer surface of the ferrite core, a fixing bracket fixedly disposed inside the housing and coupled to the other end of the ferrite core, and a fixing bracket disposed inside the fixing bracket and surrounding the other end of the core body, and a movable bracket configured to move in conjunction with the core body and synchronize with the movement of the core body, wherein the ferrite core has a first cross-sectional shape in a first vertical direction perpendicular to the longitudinal direction and a second cross-sectional shape in a second vertical direction perpendicular to the longitudinal direction and the first vertical direction, the first cross-sectional shape being different from the second cross-sectional shape, and the ferrite core includes a curved portion disposed at one end of the ferrite core, the curved portion including at least two curved surfaces curved toward the through hole from one side of the one end of the ferrite core to a portion adjacent to the through hole of the ferrite core. [Effects of the Invention]

[0033] The ferrite core according to the embodiment of the present invention and the stylus pen including the same can be optimized for a housing having a specific shape.

[0034] Another advantage is that the magnitude of the pen signal received at the receiver can be improved.

[0035] Another advantage is that the hover state and the contact state of the stylus pen can be clearly distinguished.

[0036] Another advantage is that the magnetic body can be synchronized with the movement of the core body.

[0037] Another advantage is that electrical elements can be electrically connected without using internal wires.

[0038] Another advantage is that the stylus pen can be made smaller.

[0039] Another advantage is that the inductor section can be stably accommodated inside the housing.

[0040] Another advantage is that drawing is possible even when the device is tilted at a certain angle. [Brief explanation of the drawings]

[0041] FIGS. 1(a) to 1(c) are diagrams for explaining one requirement of a conventional stylus pen.

[0042] FIG. 2 is a diagram showing a simplified internal structure of a conventional stylus pen.

[0043] FIG. 3 is a perspective view of a stylus pen 100 according to one embodiment of the present invention.

[0044] FIG. 4 is a cross-sectional view of part A of the stylus pen 100 shown in FIG.

[0045] FIG. 5 is a detailed cross-sectional view of the inductor section 120 shown in FIG.

[0046] 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.

[0047] 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.

[0048] 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.

[0049] FIG. 9 is a cross-sectional view of a portion of the stylus pen 100 shown in FIG.

[0050] FIG. 10(a) is a perspective view for explaining the structure of the inner case 110 and the buffer member 115 shown in FIG. 9, and FIG. 10(b) is a perspective view of only the inner case 110. FIG.

[0051] FIG. 11 is a perspective view of the device shown in FIG. 10(a) with the inner case 110 removed.

[0052] 12(a) and 12(b) are perspective views of the first fixing member 130 shown in FIGS. 9 and 11, viewed from various sides.

[0053] 13(a) and 13(b) are perspective views of the moving member 170 shown in FIGS. 9 and 11, viewed from various sides.

[0054] 14(a) and 14(b) are perspective views of the second fixing member 190 shown in FIGS. 9 and 11, viewed from various sides.

[0055] FIG. 15 is a perspective view of the partial configuration shown in FIGS. 9 and 11, seen from one side.

[0056] 16(a) and 16(b) are perspective views of only a portion of the configuration shown in FIGS. 9 and 11. FIG.

[0057] 17(a) to 17(c) are diagrams for explaining the operation of the stylus pen 100 shown in FIGS. 9 to 16. FIG.

[0058] FIG. 18(a) is a diagram showing an example of the change in the LC value of the resonant circuit unit due to the operations of FIG. 17(a) to (c).

[0059] FIG. 18(b) is a graph showing frequency characteristics in each of the operating states of FIG. 17(a) to (c).

[0060] 19(a) to 19(c) are diagrams for explaining problems that occur due to assembly deviation of the core body 102 when assembling the stylus pen 100 shown in FIGS. 9 to 17. FIG.

[0061] FIG. 20 is a graph showing the change in resonance frequency due to the pressure applied to the core body 102 for each of (a) to (c) of FIG.

[0062] 21(a) to 21(c) are diagrams for explaining problems that occur due to assembly deviations of the connection terminals 165a and 165b when assembling the stylus pen 100 shown in FIGS. 9 to 17. FIG.

[0063] FIG. 22 is a cross-sectional view of a portion of a stylus pen according to a modified embodiment of the stylus pen 100 shown in FIG.

[0064] 23(a) and 23(b) are views for explaining the first elastic member 180' shown in FIG.

[0065] 24(a) to 24(c) are diagrams for explaining the operation of the stylus pen shown in FIGS. 22 and 23. In FIG.

[0066] 25(a) and 25(b) are diagrams showing an example in which assembly deviation occurs in the core body 102. In FIG.

[0067] FIG. 26 is a graph showing the change in resonance frequency due to the pressure applied to the core body 102 for each of (a) and (b) of FIG.

[0068] FIG. 27 is a perspective view of a modified example of the ferrite core 121 shown in FIGS.

[0069] 28(a) is an enlarged front view of a portion of the ferrite core 121' shown in FIG. 27, and FIG. 28(b) is a cross-sectional view taken along line A-A' in FIG. 28(a).

[0070] FIG. 29 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.

[0071] FIG. 30 is a cross-sectional view showing only the ferrite core 121'' and the coil portion 123 shown in FIG.

[0072] FIG. 31 is a perspective view of the ferrite core 121'' shown in FIGS.

[0073] 32(a) is an enlarged front view of a portion of the ferrite core 121'' shown in FIG. 31, and FIG. 32(b) is a cross-sectional view taken along line BB' in FIG. 31(a).

[0074] FIG. 33 is a perspective view of a stylus pen 1000 according to another embodiment of the present invention.

[0075] FIG. 34 is a cross-sectional view of a portion of the stylus pen 1000 shown in FIG.

[0076] FIG. 35 is a perspective view of the stylus pen 1000 shown in FIG. 33 with the housing 1010 removed.

[0077] FIG. 36 is a perspective view of only the fixed bracket 1600 shown in FIG.

[0078] FIG. 37 is a perspective view of the fixing bracket 1600 shown in FIG. 36, seen from another direction.

[0079] FIG. 38 is a partial perspective view of FIG. 35 seen from another direction.

[0080] FIG. 39 is a perspective view of the inductor section 1200 and the fixing bracket 1600 shown in FIG. 35 removed.

[0081] FIG. 40 is a perspective view of FIG. 39 seen from another direction.

[0082] FIG. 41 is a cross-sectional view of FIG.

[0083] FIG. 42 is a perspective view of only the elastic member 1800 shown in FIG.

[0084] FIG. 43 is a perspective view of the board bracket 1900 and board 2100 shown in FIG.

[0085] FIG. 44 is a diagram illustrating the movement of the moving bracket 1300 in accordance with the movement of the core body 1020 shown in FIGS. 35 to 43, and the electrical contact and release between the fixed bracket 1600 and the moving bracket 1300.

[0086] Figure 45 is a diagram of (A) and (B) in Figure 44, respectively.

[0087] FIG. 46 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.

[0088] FIG. 47 is a perspective view of the stylus pen 1000 according to another embodiment of the present invention shown in FIG. 33, viewed from the side of the core body 1020. In FIG.

[0089] FIG. 48A is a partial cross-sectional view of the stylus pen 1000 shown in FIG. 47 taken along line A-A'.

[0090] FIG. 48B is a partial cross-sectional view of the stylus pen 1000 shown in FIG. 47 taken along line BB'.

[0091] FIG. 49 shows side views A and B and a cross-sectional view of the ferrite core 1210 shown in FIGS.

[0092] FIG. 50 is a diagram for explaining a modification of the ferrite core 1210 shown in FIG.

[0093] FIG. 51 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

[0094] 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.

[0095] FIG. 3 is a perspective view of a stylus pen 100 according to one embodiment of the present invention.

[0096] Referring to FIG. 3, a stylus pen 100 according to an embodiment of the present invention includes a housing 101 and a core body 102.

[0097] 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.

[0098] The housing 101 may be made of a non-conductive synthetic resin material.

[0099] 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.

[0100] 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, it may be a mechanical or contact button for a cancel operation.

[0101] 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.

[0102] 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.

[0103] The internal structure of the housing 101 will be described below with reference to FIGS.

[0104] 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.

[0105] 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.

[0106] 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.

[0107] 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.

[0108] 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 block external electrical or magnetic influences.

[0109] 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 .

[0110] 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.

[0111] The inductor unit 120 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 120 and the capacitance (C) value of the capacitor unit (not shown). The resonant frequency may be varied depending on the change in the inductance (L) value of the inductor unit 120 and the capacitance (C) value of the capacitor unit (not shown).

[0112] The inductor portion 120 includes a ferrite core 121 and a coil portion 123 wound around the outer surface of the ferrite core 121 .

[0113] The coil portion 123 may be wound around the ferrite core 121 in at least one layer.

[0114] The ferrite core 121 may have an overall cylindrical or polygonal cylindrical shape, and may have a through-hole 121h formed therethrough along the longitudinal direction of the ferrite core 121.

[0115] The ferrite core 121 has a through-hole 121h inside, 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 longitudinal direction via the through-hole 121h.

[0116] 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.

[0117] The ferrite core 121 may include an upper end portion 121a and a lower end portion 121b disposed below the upper end portion 121a. Here, the upper end portion 121a and the lower end portion 121b may be integrally formed.

[0118] The upper end 121a has a cylindrical, elliptical, or polygonal cylindrical shape. The diameter or width of the cylinder or polygonal cylinder may be constant as shown in the drawings. Alternatively, the diameter or width of the cylinder, elliptical, or polygonal cylinder may not be constant, and may be different from the diameter or width of a portion that has a different diameter or width.

[0119] 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.

[0120] 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.

[0121] The bottom end 121b has a tapered shape that narrows from top to bottom, but 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.

[0122] 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.

[0123] 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.

[0124] 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 further 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 with reference to FIG. 7.

[0125] 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).

[0126] 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, there is a limit to the thickness T2 due to the structure of the buffer member 115' and other manufacturing process considerations.

[0127] 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 positioned at the lowest end within the housing 101, it becomes as shown in Figure 7(a).

[0128] Referring to (c) of FIG. 7, the ferrite core 121 is arranged at the same position as the ferrite core 131' in (a) of FIG. 7. However, since the ferrite core 121 has the curved surface portion 121c, correspondingly, the buffer member 115'' has a structural difference from the buffer member 115' shown in (a) of FIG. 7. Specifically, the inner surface of the buffer member 115'' has a convex curved surface corresponding to the curved surface portion 121c of the ferrite core 121.

[0129] The thickness between the outer surface of the buffer member 115'' and the inner surface formed by the curved 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 portion of the inner surface of the buffer member 115'' has a thickness between T2 and T1 (>T2).

[0130] In (c) of FIG. 7, at least a part (upper and lower ends) of the buffer member 115'' satisfies the minimum thickness of T2, and the thickness of the middle portion of the buffer member 115'' has a thickness T1 greater than the minimum thickness of T2. Thus, since the thickness T1 of the middle portion of the buffer member 115'' is thicker than T2, there is an advantage that it is easier to manufacture the buffer member 115'' than the conventional buffer member 115' in (a) of FIG. 7 when manufacturing the buffer member 115''.

[0131] Referring to (b) of FIG. 7, the inner surface of the buffer member 115 is formed by a curved surface due to 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 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 the outer surface of the buffer member 115.

[0132] In Figure 7(b), although the minimum thickness T2 cannot be met at the top and bottom of the buffer member 115, the minimum thickness T2 is met at the middle of the buffer member 115, so it may be possible to manufacture the buffer member 115. The buffer member 115 manufactured in this manner has a thinner minimum thickness than the buffer members 115' and 115'' shown in Figures 7(a) and 7(c), so the volume of the buffer member 115 can be further reduced. Therefore, the buffer member 115 can be disposed further downward from inside the tapered portion 101t of the housing 101, and therefore the ferrite core 121 can be disposed further downward by a predetermined height S than in Figures 7(a) and 7(c).

[0133] 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.

[0134] Referring to the table shown in FIG. 8, it can be seen that as the predetermined height S increases, the magnitude of the pen signal received at the receiver increases.

[0135] 4 to 7, the stylus pen 100 according to an embodiment of the present invention has a tapered portion of the ferrite core 121 of the inductor unit 120 that has a different shape from the conventional ferrite core 131', which allows the thickness of the buffer member 115 to be further reduced and the ferrite core 121 to be positioned closer to the end of the core body 102 inside the housing 101. Therefore, a receiver that receives a pen signal emitted from the stylus pen 100 according to an embodiment of the present invention can obtain a larger pen signal, thereby improving the stylus pen detection sensitivity at the receiver.

[0136] 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.

[0137] Hereinafter, a detailed internal structure of the stylus pen 100 according to an embodiment of the present invention to which the ferrite core 121 and the buffer member 115 shown in FIGS. 4 to 7 are applied will be described with reference to the drawings.

[0138] 9 is a cross-sectional view of a portion of the stylus pen 100 according to an embodiment of the present invention shown in FIG. 3, FIG. 10(a) is a perspective view for explaining the structure of the inner case 110 and the buffer member 115 shown in FIG. 9, FIG. 10(b) is a perspective view of only the inner case 110, FIG. 11 is a perspective view of the case where the inner case 110 shown in FIG. 10(a) is removed, and FIGS. 12(a) and 12(b) are perspective views of the first fixing member 13 shown in FIGS. 9 and 11. 11, (a) and (b) of FIG. 13 are perspective views of the movable member 170 shown in FIGS. 9 and 11, viewed from various sides; (a) and (b) of FIG. 14 are perspective views of the second fixed member 190 shown in FIGS. 9 and 11, viewed from various sides; FIG. 15 is a perspective view of a portion of the configuration shown in FIGS. 9 and 11, viewed from one side; and (a) and (b) of FIG. 16 are perspective views of only a portion of the configuration shown in FIGS. 9 and 11.

[0139] Referring to FIG. 9, the stylus pen 100 includes at least two of an inner case 110, a buffer member 115, an inductor portion 120, a capacitor portion (not shown), a first fixed member 130, a magnetic body 140, a cover member 150, a ring terminal 161, contact terminals 165a, 165b, a movable member 170, a first elastic member 180, a second elastic member 185, an elastic body 155, a second fixed member 190, and a substrate 210.

[0140] The inner case 110 is made of a non-conductive material and is disposed inside the housing 101. Specifically, the inner case 110 may be disposed inside the first housing 101a of the housing 101. The inner case 110 may have a shape that surrounds the inductor unit 120, the first fixing member 130, the ferrite chip 140, the cover member 150, the ring terminal 161, the contact terminals 165a and 165b, the moving member 170, the first elastic member 180, the second elastic member 185, the elastic body 155, and the second fixing member 190. The inner case 110 may serve to protect various components disposed inside from physical and / or electrical shocks.

[0141] 9 and 10(a) and (b), the inner case 110 may have a first opening 111 in which the first protrusion 131 of the first fixing member 130 and the first protrusion 192 of the second fixing member 190 are disposed. The first opening 111 may have a base groove 111b formed to extend in the longitudinal direction of the stylus pen 100, and a plurality of extension grooves 111e connected to the base groove 111b and extending in a direction perpendicular to the longitudinal direction of the base groove 111b. The plurality of extension grooves 111e may be formed at positions corresponding to the plurality of first protrusions 131 and 192. For example, the first opening 111 may have an "E" shape.

[0142] The inner case 110 can be rotated counterclockwise or clockwise around the core 102 as a rotation axis to position the multiple first protrusions 131, 192 from the multiple extension grooves 111e to the base groove 111b, or from the base groove 111b to the multiple extension grooves 111e. In particular, by positioning the multiple first protrusions 131, 192 from the base groove 111b to the multiple extension grooves 111e, the first fixing member 130 and the second fixing member 190 can be fixed in position inside the inner case 110. Meanwhile, because the moving member 170 is not directly coupled to the inner case 110, it can move between the first fixing member 130 and the second fixing member 190 in conjunction with the linear reciprocating motion of the core 102 caused by an external force.

[0143] The inner case 110 may have a second opening 113 in which the extension coils 125a and 125b are disposed and which exposes the connection terminals 165a and 165b. The second opening 113 provides a space for disposing the extension coils 125a and 125b and can protect the extension coils 125a and 125b from external impact. In addition, the attachment positions of the connection terminals 165a and 165b can be easily confirmed through the second opening 113.

[0144] The buffer member 115 may be disposed between the inductor 120 and the housing 101, and between the core 102 and the inner case 110. The buffer member 115 has a through-hole through which the core 102 passes. The buffer member 115 can guide the position of the core 102, stably fix the inductor section 120, and shield the inductor section 120 from external electrical or magnetic influences. The buffer member 115 may be configured separately from the inner case 110, but is not limited thereto, and the buffer member 115 may be configured integrally with the inner case 110.

[0145] 9 and 11, buffer member 115, inductor section 120, first fixed member 130, moving member 170, and second fixed member 190 may be arranged in this order from one end of core body 102 along the longitudinal direction of stylus pen 100 (hereinafter referred to as the "longitudinal direction"). That is, along the longitudinal direction, inductor section 120 may be arranged on buffer member 115, first fixed member 130 may be arranged on inductor section 120, moving member 170 may be arranged on first fixed member 130, and second fixed member 190 may be arranged on moving member 170.

[0146] The inductor unit 120 includes a ferrite core 121 and a coil unit 123 wound around the ferrite core 121. The ferrite core 121 has a through-hole therein through which the core 102 passes. The core 102 can move linearly back and forth along the longitudinal direction via the through-hole. The coil unit 123 may be wound around the ferrite core 121 in at least one layer. Extension coils 125a and 125b may be connected to both ends of the coil unit 123, respectively. The extension coils 125a and 125b extend along the longitudinal direction and may be connected to coil electrodes 213a and 213b arranged on the substrate 210, respectively.

[0147] The inductor unit 120 is fixedly installed inside the housing 101. The inductor unit 120 may be fixed between the first fixing member 130 and the buffer member 115 in the longitudinal direction. The inductor unit 120 may be fixed by the inner case 110 in a direction perpendicular to the longitudinal direction (hereinafter referred to as the "vertical direction").

[0148] The inductor part 120 may be fixed to one side of the first fixing member 130. Here, a portion of the inductor part 120 may be disposed in the second cavity 133b of the first fixing member 130.

[0149] The inductor unit 120 may be electrically connected to a capacitor unit (not shown) mounted on the substrate 210 to form a resonant circuit. A resonant frequency may be set depending on the inductance (L) value of the inductor unit 120 and the capacitance (C) value of the capacitor unit (not shown). The resonant frequency may be variable because the inductance (L) value of the inductor unit 120 changes depending on the movement of the magnetic material 140.

[0150] The capacitor unit (not shown) is disposed on the substrate 210 and has a predetermined capacitance (C) value. The capacitor unit (not shown) may include two or more capacitors. At least one of the two or more capacitors may be configured as a basic capacitor in a circuit in a state where it is always electrically connected to the inductor unit 120.

[0151] The capacitor unit (not shown) includes a jumping capacitor 215. The jumping capacitor 215 may be mounted on the substrate 210 and configured to be electrically connected to the connection terminals 165a and 165b. For example, the jumping capacitor 215 may be electrically connected to connection pads 211a and 211b disposed on the substrate 210 via conductive patterns 212a and 212b. The jumping capacitor 215 may be electrically connected to or separated from the base capacitor according to the movement of the core 102. When no external force is applied to the core 102, the ring terminal 161 is in contact with the connection terminals 165a and 165b, and the jumping capacitor 215 is electrically connected to the base capacitor. On the other hand, if an external force is applied to the core body 102 and the movable member 170, which is linked to the core body 102, moves toward the first elastic member 180, the ring terminal 161 separates from the connecting terminals 165a and 165b, and at this time, the jumping capacitor 215 can be electrically separated from the basic capacitor.

[0152] 9, 11, 12(a) and 12(b), the first fixing member 130 is disposed inside the inner case 110. The first fixing member 130 has an overall cylindrical shape. The first fixing member 130 has a first cavity 133a and a second cavity 133b. The magnetic body 140 shown in FIG. 9 is disposed in the first cavity 133a, and one end of the ferrite core 121 of the inductor unit 120 shown in FIG. 9 is disposed in the second cavity 133b. A partition wall 132 is disposed between the first cavity 133a and the second cavity 133b, and the partition wall 132 has a through-hole 132h through which the core 102 passes.

[0153] The inductor part 120 is disposed on one side of the first fixing member 130, and the second fixing member 190 is disposed at a predetermined distance from the other side of the first fixing member 130.

[0154] The first fixing member 130 may have a large number of first protrusions 131 arranged on its outer surface, as described above.

[0155] A plurality of first grooves 135 may be formed on the outer surface of the first fixing member 130, in which the plurality of extension portions 171 of the moving member 170 are respectively disposed. Also, a second groove 137 may be formed on the outer surface of the first fixing member 130 along the longitudinal direction, maintaining a constant distance from the extension coils 125a and 125b shown in FIG.

[0156] 9, 11, and 13(a) and (b), the moving member 170 is disposed between the first fixed member 130 and the second fixed member 190. The moving member 170 can move linearly back and forth between the first fixed member 130 and the second fixed member 190 in conjunction with the movement of the core body 102 in the longitudinal direction.

[0157] The movable member 170 is disposed inside the inner case 110. The movable member 170 has an overall cylindrical shape. The movable member 170 has a first cavity 173a and a second cavity 173b. A portion of the first elastic member 180 shown in FIG. 9 is disposed in the first cavity 173a, and a portion of the cover part 150 shown in FIG. 9 is disposed in the second cavity 173b. A partition wall 172 is disposed between the first cavity 173a and the second cavity 173b, and the partition wall 172 is disposed between the cover part 150 and the first elastic member 180.

[0158] A plurality of extensions 171 are arranged on the outer surface of the movable member 170 to be placed in the plurality of first grooves 135 of the first fixed member 130. The plurality of extensions 171 have a shape extending along the longitudinal direction and can move along the first grooves 135 of the first fixed member 130.

[0159] A plurality of second grooves 175 may be formed on the outer surface of the movable member 170, in which the second extensions 193 of the second fixed members 190 shown in Fig. 14 are respectively disposed. As the movable member 170 linearly reciprocates in the longitudinal direction, the second grooves 175 are also moved together, so that the positions of the second extensions 193 of the second fixed members 190 disposed in the second grooves 175 may change.

[0160] The second groove 175 of the movable member 170 may have a shape corresponding to the second extension portion 193 of the second fixed member 190. The second groove 175 may have a shape that prevents the second extension portion 193 of the second fixed member 190 from completely disengaging from the second groove 175 when the movable member 170 moves away from the second fixed member 190. To this end, the second groove 175 may have a shape in which the width of the second groove 175 narrows as it goes toward the second fixed member 190, and the second extension portion 193 of the second fixed member 190 may have a shape that protrudes in the width direction of the second groove 175.

[0161] A first groove 177 may be formed on the outer surface of the moving member 170. The first groove 177 is formed long along the longitudinal direction, and as shown in FIG. 16(b), the connection terminals 165a and 165b may be disposed in the first groove 177. The first groove 177 may fix and guide the positions of the connection terminals 165a and 165b. In addition, the first extension 192 of the second fixing member 190 may be disposed in the first groove 177 together with the connection terminals 165a and 165b.

[0162] The movable member 170 is disposed between the first fixed member 130 and the second fixed member 190, and the extension 171 of the movable member 170 is disposed in the first groove 135 of the first fixed member 130, and the first and second extensions 193, 199 of the second fixed member 190 are disposed in the first and second grooves 175, 177 of the movable member 170, which has the advantage that the movable member 170 does not come off even when it is moved frequently.

[0163] The moving member 170 includes a surface 179 in which the first cavity 173a is disposed, and the ring terminal 161 shown in FIGS. 9 and 15 may be disposed on the surface 179. The shape of the surface 179 may correspond to the shape of the ring terminal 161. The ring terminal 161 disposed on the surface 179 may be guided by inner surfaces of one or more extensions 171 disposed around the periphery.

[0164] 9, 11, and 14, the second fixing member 190 is fixedly disposed inside the housing 101. At least a portion of the second fixing member 190 is fixedly disposed inside the inner case 110.

[0165] The second fixing member 190 includes a cylindrical base portion 191. One surface 191a of the base portion 191 has a cavity 195 in which a part of the first elastic member 180 shown in Fig. 9 is disposed. The second elastic member 185 shown in Fig. 9 is disposed on the one surface 191a of the base portion 191.

[0166] The second fixing member 190 includes a first extension 199 and a second extension 193 extending from one surface 191a of the base 191 toward the movable member 170. A plurality of the first extensions 199 and the second extensions 193 may be arranged on the one surface 191a of the base 191. Specifically, two first extensions 199 may be arranged to face each other, and two second extensions 193 may be arranged to face each other. The plurality of first and second extensions 191, 199 may guide the outer surface of the second elastic member 185 shown in FIG. 9 from all sides. Therefore, the position of the second elastic member 185 may be fixed by the plurality of first and second extensions 191, 199.

[0167] The inner surface of the first extension portion 199 guides the outer surface of the second elastic member 185, and the outer surface of the first extension portion 199 can support a portion of the connection terminals 165a and 165b shown in Figures 9 and 11.

[0168] The second extension 193 may have a predetermined shape that prevents it from being disengaged from the second groove 175 after being coupled to the second groove 175 of the moving member 170. For example, the second extension 193 may have a shape in which at least a portion thereof protrudes, and it cannot be disengaged from the second groove 175.

[0169] The second fixing member 190 may have a groove 194 formed on the outer surface of the base portion 191. A bottom surface of the groove 194 may be connected to the outer surface of the first extension portion 199 without any step. Parts of the connection terminals 165a and 165b shown in FIGS. 9 and 11 may be disposed in the groove 194.

[0170] The second fixing member 190 may include a mounting portion 196 extending in the longitudinal direction from another surface (not shown) of the base portion 191. The mounting portion 196 may have a cavity 197 in which the substrate 210 shown in FIGS. 9 and 11 is disposed.

[0171] 9 and 11 to be connected to a substrate 210 disposed in a cavity 197. The other ends of the connection terminals 165a and 165b may be disposed in the openings 198 and connected to connection pads 211a and 211b of the substrate 210.

[0172] 9, 11, 15, and 16(a) and (b), the core body 102 is formed to extend a predetermined length along the longitudinal direction, and one end may have a pointed shape, where the one end is exposed to the outside of the housing 101.

[0173] The core body 102 includes a step portion 102T disposed in a portion of the middle portion between one end and the other end. The thicknesses of one end and the other end of the middle portion may be different from each other, based on the step portion 102T. A first thickness D1 of one end of the middle portion, based on the step portion 102T, may be formed thicker than a second thickness D2 of the other end of the middle portion. Due to the configuration of the step portion 102T, when the core body 102 moves in the longitudinal direction due to an external force, the magnetic body 140 can move along with it. That is, when the core body 102 moves, the step portion 102T presses one side of the magnetic body 140, causing the magnetic body 140 to move in the longitudinal direction. As the magnetic body 140 moves in the longitudinal direction, the separation distance between the inductor portion 120 and the magnetic body 140 changes. The change in the separation distance changes the inductance (L) value of the inductor portion 120, and the change in the inductance value changes the resonant frequency of the stylus pen 100. A stylus pen sensing device that interacts with the stylus pen 100 senses the change in the resonance frequency, and can detect the writing pressure (pressure) applied to the core body 102 .

[0174] The magnetic body 140 is disposed inside the first cavity 133a of the first fixing member 130 shown in Fig. 12 and has a cylindrical shape. The magnetic body 140 has a through-hole through which a portion of the core body 102 passes. The diameter of the through-hole may be equal to or larger than the second thickness D2 and smaller than the first thickness D1.

[0175] The magnetic body 140 may be a ferrite chip.

[0176] The magnetic body 140 can move linearly back and forth along the longitudinal direction in conjunction with the core body 102. When the magnetic body 140 moves in conjunction with the core body 102, the inductance (L) value of the inductor section 120 can change.

[0177] A cover portion 161 is disposed at the other end of the core body 102. The cover portion 161 may have a shape that covers the other end of the core body 102. For example, the cover portion 161 may have a cylindrical shape with different thicknesses at the top and bottom.

[0178] An elastic body 155 may be disposed between the cover portion 161 and the magnetic body 140. The elastic body 155 may be a spring. One end of the elastic body 155 may be sandwiched between a part of the cover portion 161, and the other end of the elastic body 155 may be disposed so as to abut against the magnetic body 140.

[0179] The elastic body 155 may be for correcting deviations in the magnetic body 140. For example, if the length (or height) of the magnetic body 140 is 0.1 mm smaller than the specification, the elastic body 155 will bring the magnetic body 140 into close contact with the partition wall 132 of the first fixing member 130.

[0180] The ring terminal 161 has a hollow circular shape and electrically connects the two connection terminals 165a and 165b. The shape of the ring terminal 161 is not limited to a circular shape, but may be a polygonal shape.

[0181] The ring terminal 161 is disposed on one surface of the moving member 170 and moves in conjunction with the moving member 170. That is, the ring terminal 161 moves together with the moving member 170 as the moving member 170 makes a linear reciprocating motion in the longitudinal direction.

[0182] The connection terminals 165a and 165b include one side that contacts or separates from the ring terminal 161 and the other side that is connected to the substrate 210. The one side may contact or separate from the ring terminal 161 according to the movement of the ring terminal 161 linked with the moving member 170. The other side is directly connected to the connection pads 211a and 211b of the substrate 210 shown in FIG. 9 by soldering or the like.

[0183] Each of the connection terminals 165a and 165b includes a base portion disposed between the one side portion and the other portion. The base portion may have a shape extending in the longitudinal direction. The base portion may be disposed in the first groove 177 of the movable member 170 shown in FIG. 13 and in the groove 194 of the second fixed member 190 shown in FIG. 14, and may be guided by the first extension portion 199 of the second fixed member 190.

[0184] The first elastic member 180 is disposed within the second fixing member 190. The first elastic member 180 may have a cylindrical shape that is elongated in the longitudinal direction. The first elastic member 180 may be made of a rubber material.

[0185] The first elastic member 180 may have one end disposed in the cavity 195 of the second fixed member 190 shown in FIG. 14, and the other end disposed in the first cavity 173a of the moving member 170 shown in FIG.

[0186] The second elastic member 185 is disposed within the second fixing member 190. The second elastic member 185 may have a flat cylindrical shape. The second elastic member 185 may be made of a rubber material. The second elastic member 185 may be made of a rubber material that is relatively harder than the first elastic member 180. Therefore, the second elastic member 185 may be made of a hard rubber material, and the first elastic member 180 may be made of a soft rubber material.

[0187] Meanwhile, the second elastic member 185 may be a spring configured to react to a relatively heavier force than the first elastic member 180. The second elastic member 185 is configured to have a thinner thickness in the longitudinal direction than the first elastic member 180 and a wider diameter in the vertical direction than the first elastic member 180.

[0188] The second elastic member 185 is disposed so as to surround the middle portion of the first elastic member 180. Therefore, the second elastic member 185 has a through-hole through which the first elastic member 180 passes.

[0189] 16(b), the second elastic member 185 may have a groove 185g that is sandwiched between a portion of the first extension portion 199 of the second fixing member 190. Through this, the second elastic member 185 can be stably fixed to the second fixing member 190.

[0190] Hereinafter, the operation of the stylus pen 100 according to the embodiment shown in FIGS. 9 to 16 will be described with reference to FIG.

[0191] Figure 17 (a) to (c) are diagrams for explaining the operation of the stylus pen 100 shown in Figures 9 to 16. Specifically, Figure 17 (a) is a diagram showing a hover state H of the stylus pen 100, Figure 17 (b) is a diagram showing a contact state C of the stylus pen 100, and Figure 17 (c) is a diagram showing a writing pressure P state of the stylus pen 100.

[0192] 17(a), in the hover state H, no external force acts on the core body 102, and therefore no change occurs in the internal configuration. In particular, the ring terminal 161 and the connection terminals 165a and 165b remain in contact with each other.

[0193] Referring to FIG. 17(b), in contact state C, a predetermined pressure is applied to one end of the core 102. The applied pressure causes the core 102 to move toward the inside of the housing 101. As the core 102 moves, the cover 150 pushes the moving member 170 toward the first elastic member 180, and the ring terminal 161 moves away from the connecting terminals 165a and 165b. Therefore, the jumping capacitor 215 shown in FIG. 9 is electrically disconnected from the base capacitor, and the total capacitance of the capacitor unit (not shown) decreases. Here, because the magnetic body 140 does not move, the inductance value of the inductor unit 120 remains unchanged. As the total capacitance value of the capacitor unit (not shown) decreases, the resonant frequency changes.

[0194] Referring to FIG. 17(c), in the writing pressure state P, a pressure greater than that in the contact state C is applied to one end of the core 102. The greater pressure causes the core 102 to move further inwardly of the housing 101, causing the magnetic body 140 to be pressed by the stepped portion 102T of the core 102. As the magnetic body 140 is pressed, the elastic body 155 disposed between the cover 150 and the magnetic body 140 is compressed, and the first elastic member 180 and the second elastic member 185 are compressed by the movement of the moving member 170. As the magnetic body 140 moves away from the inductor 120, the inductance (L) value of the inductor 120 gradually decreases. The capacitance of the capacitor (not shown) remains the same as in the contact state C. As the inductance value of the inductor 120 decreases, the resonant frequency changes.

[0195] Figure 18(a) shows an example of the change in the LC value of the resonant circuit unit due to the operations of Figure 17(a) to (c), where the Th section shows the hover state of Figure 17(a), the Tc point shows the contact state of Figure 17(b), and the Tp section shows the pen pressure state of Figure 17(c). Figure 18(b) is a graph showing the frequency characteristics in each of the operation states of Figure 17(a) to (c).

[0196] Referring to (a) of FIG. 18, the LC value of the resonant circuit unit, which is composed of a capacitor unit (not shown) and an inductor unit 120, maintains a constant value until (Th) before the core 102 of the stylus pen 100 contacts the touch surface, and then rapidly decreases immediately (Tc) after the core 102 contacts the touch surface. Furthermore, in a section (Tp) where writing pressure is applied to the stylus pen 100 after the stylus pen 100 contacts the touch surface, the LC value of the resonant circuit unit further decreases with the writing pressure. That is, in this section (Tp), the LC value of the resonant circuit unit may gradually decrease as the writing pressure applied to the stylus pen 100 increases. Referring to (a) of FIG. 18, the LC value of the resonant circuit unit indicates a hover state > a contact state > a writing pressure state. Furthermore, immediately after the core 102 contacts the touch surface, the LC value may change more significantly as the writing pressure gradually increases.

[0197] If the inductance value of the inductor unit 120 and the capacitance value of the capacitor unit (not shown) are changed, the resonant frequency and Q value of the resonant circuit unit can be changed. The resonant frequency of the resonant circuit unit increases as the inductance of the resonant circuit unit decreases, and the Q value decreases as the inductance decreases. Therefore, as shown in (b) of FIG. 18, the frequency characteristics of the resonant signal Vpen output from the resonant circuit unit may be such that the resonant frequency increases (hover state < contact state < writing pressure state) and the Q value decreases (hover state > contact state > writing pressure state) as the movement distance of the core 102 increases, i.e., as the writing pressure increases.

[0198] If the resonant frequency of the resonant circuit unit is changed, the phase of the electromagnetic signal output from the stylus pen 100 is changed. This phase change is used to calculate a change in the LC value of the resonant circuit unit in a stylus pen sensing device that interacts with the stylus pen 100, and based on this, it is possible to detect whether the stylus pen 100 is in contact with the stylus pen sensing device and the writing pressure.

[0199] As described above, the stylus pen 100 according to the embodiment shown in Figures 9 to 16 can detect writing pressure using a stylus pen sensing device by varying at least one or both of the inductance and capacitance values ​​of the resonant circuit unit, and also has the advantage of being able to sense writing pressure precisely.

[0200] Meanwhile, in the stylus pen according to the embodiment shown in Figures 9 to 16, assembly deviations may occur during the assembly process. The assembly deviations may cause certain problems, which will be described in detail below with reference to Figures 19 to 21.

[0201] 19(a) to 19(c) are diagrams for explaining problems that occur due to assembly deviation of the core body 102 when assembling the stylus pen 100 shown in FIGS. 9 to 17. FIG.

[0202] Specifically, Figure 19(a) shows a case where the core body 102 is installed as designed without any assembly deviation, while Figure 19(b) and Figure 19(c) show a case where the core body 102 cannot be installed in the designed position due to an assembly deviation that occurs during the assembly process.

[0203] In (a) of FIG. 19, the step portion 102T of the core body 102 is positioned in the through hole 132h formed in the partition wall 132 of the first fixing member 130. The position of the step portion 102T is properly assembled without deviation. On the other hand, in (b) and (c) of FIG. 19, the step portion 102T is positioned in a position other than the through hole 132h of the partition wall 132 due to an assembly deviation. Specifically, in (b) of FIG. 19, the step portion 102T is positioned in the second cavity 133b (see (b) of FIG. 12) of the first fixing member 130 in which the inductor portion 120 is disposed, and in (c) of FIG. 19, the step portion 102T is positioned in the first cavity 133a (see (a) of FIG. 12) of the first fixing member 130 in which the magnetic body 140 is disposed.

[0204] 19(b), where an assembly deviation occurs, even if pressure is applied to the core 102 immediately after the contact state of FIG. 17(b), the distance between the inductor unit 120 and the magnetic body 140 is constant, so the inductance value of the inductor unit 120 does not change significantly. On the other hand, in the case of FIG. 19(c), the magnetic body 140 moves due to the core 102 between the hover state of FIG. 17(a) and the contact state of FIG. 17(b), so the inductance value of the inductor unit 120 may change.

[0205] Changes in the resonant frequency due to pressure applied to the core body 102 for each of (a) to (c) of FIG. 19 will be described with reference to FIG.

[0206] In the graph of Figure 20, the line (1) without assembly deviation corresponds to (a) in Figure 19, the line (2) with assembly deviation corresponds to (c) in Figure 19, and the line (3) with assembly deviation corresponds to (b) in Figure 19.

[0207] Referring to FIG. 20, in the case of (3) a line, even if the pressure increases immediately after the core 102 is in a contact state, there is no change in the resonant frequency. A stylus pen sensing device that interacts with the stylus pen 100 cannot sense the writing pressure acting on the core 102. In the case of (2) a line, the resonant frequency changes even when the core 102 is in a hover state, so the stylus pen sensing device can recognize the core 102 in a contact state when it is not in a hover state. As such, due to the assembly deviations of (b) and (c) in FIG. 19, the stylus pen device may have difficulty accurately sensing the stylus pen 100.

[0208] 21(a) to 21(c) are diagrams for explaining problems that occur due to assembly deviations of the connection terminals 165a and 165b when assembling the stylus pen 100 shown in FIGS. 9 to 17. FIG.

[0209] Specifically, Figure 21(a) shows a case where the connection terminals 165a and 165b are installed as designed without any assembly deviation, while Figure 21(b) and Figure 21(c) show a case where the connection terminals 165a and 165b cannot be installed in the designed position due to an assembly deviation that occurs during the assembly process.

[0210] In FIG. 21(a), one end 165a1 of the connection terminal 165a is positioned in contact with the ring terminal 161, and the other end 165a2 is positioned in contact with the connection pad 211a of the substrate 210. This position of the connection terminal 165a is the result of proper assembly without deviation. In contrast, in FIGS. 21(b) and 21(c), the connection terminal 165a is positioned in a different position than the pre-designed position due to assembly deviation. Specifically, in FIG. 21(b), the connection terminal 165a is offset a predetermined distance toward the substrate 210, and one end 165a1 presses the ring terminal 161 with considerable force. In FIG. 21(c), the connection terminal 165a is offset a predetermined distance toward the first fixing member 130, and one end 165a1 is spaced a predetermined distance from the ring terminal 161.

[0211] In the case of Fig. 21(b) where an assembly deviation occurs, the connection terminal 165a and the ring terminal 161 are assembled in a state where they are pressed against each other, which increases the pressure required to recognize the contact state of Fig. 17(b). On the other hand, in the case of Fig. 21(c), the ring terminal 161 and the connection terminal 165a are separated from each other in the hover state of Fig. 17(a), so even if pressure is applied to the core 102, the stylus pen sensing device cannot sense the contact state of Fig. 17(b).

[0212] The following Figures 22 to 26 will explain a stylus pen according to another embodiment in which the performance is not significantly affected even if the assembly deviation described with reference to Figures 19 to 21 occurs, and the internal structure is reduced, thereby reducing manufacturing costs.

[0213] The stylus pen shown in Figure 22 differs from the stylus pen 100 shown in Figures 9 to 17 in that 1) the first elastic member 180' is made of a spring that is not made of rubber, and 2) the ring terminal 161, connection terminals 165a and 165b, jumping capacitor 215, and the components for electrically connecting these components are omitted from the stylus pen 100 shown in Figures 9 to 17. The remaining components are the same as those of the stylus pen 100 shown in Figures 9 to 17, so a detailed description will be given below of the components that differ from those described above.

[0214] 22, the first elastic member 180' is configured as a spring. The first elastic member 180' begins to compress at a low pressure (for example, around 10 gf) and can be configured to compress quickly even with a small increase in pressure due to its weak compression strength.

[0215] Figures 23(a) and (b) are views for explaining the first elastic member 180' shown in Figure 22. Figure 23(a) shows a state in which no force is applied to the first elastic member 180', and Figure 23(b) shows that the first elastic member 180' is disposed between the moving member 170 and the second fixed member 190 shown in Figure 22.

[0216] As shown in Figure 23 (b), the first elastic member 180' may be sandwiched between the movable member 170 and the second fixed member 190 and placed in a partially compressed (or incompletely compressed) state. The first elastic member 180' will not be compressed unless a force (or repulsive force) greater than the force applied by the movable member 170 and the second fixed member 190 is applied. Here, the force (or repulsive force) may be, for example, around 10 gf. On the other hand, the second elastic member 190 will be compressed if a force greater than the force applied by the movable member 170 is applied.

[0217] The following Equation 1 shows the force (or repulsive force, F) of the partially compressed first elastic member 180'. Equation 1

[0218] In <Equation 1> on TIFF0007756959000001.tif18142, G is the transverse elastic modulus of the spring, Na is the number of effective turns of the spring, D is the diameter of the spring, d is the diameter of the wire, and x is the length of the compressed spring (in the negative direction).

[0219] Meanwhile, the first elastic member 180′ may be disposed in an uncompressed state between the movable member 170 and the second fixed member 190. Therefore, the stylus pen according to other embodiments of the present invention is not limited to the first elastic member 180′ being disposed between the movable member 170 and the second fixed member 190 in a partially compressed state.

[0220] The first elastic member 180 ′ may be configured to react with a relatively greater weight than the elastic body 155 .

[0221] Hereinafter, the operation of the stylus pen according to the other embodiment shown in FIGS. 22 and 23 will be described with reference to FIG.

[0222] Figure 24 (a) to (c) are diagrams for explaining the operation of the stylus pen shown in Figures 22 and 23. Specifically, Figure 24 (a) is a diagram showing the hover state H of the stylus pen, Figure 24 (b) is a diagram showing the contact state C of the stylus pen, and Figure 24 (c) is a diagram showing the writing pressure state P of the stylus pen.

[0223] Referring to (a) of FIG. 24, in the hover state H, no external force acts on the core body 102, and therefore there is no change in the internal configuration.

[0224] Referring to FIG. 24(b), in contact state C, a predetermined pressure is applied to one end of the core 102. The applied pressure causes the core 102 to move toward the inside of the housing 101. As the core 102 moves, the cover 150 pushes the moving member 170 toward the first elastic member 180′, and the moving member 170 is pushed toward the second elastic member 185. In this state, the first elastic member 180′ is compressed as much as the moving member 170 is pushed. Then, as the core 102 moves, the step portion 102T of the core 102 pushes the magnetic body 140 toward the first elastic member 180′. As the magnetic body 140 is pushed, the distance between the inductor unit 120 and the magnetic body 140 changes. This change in distance changes the inductance value of the inductor unit 120, ultimately changing the resonant frequency.

[0225] Referring to (c) of FIG. 24, in the writing pressure state P, a pressure greater than that in the contact state C is applied to one end of the core 102. The greater pressure causes the core 102 to move further inward in the housing 101, thereby moving the magnetic body 140 further away from the inductor unit 120. As the magnetic body 140 is pressed, the elastic body 155 disposed between the cover unit 150 and the magnetic body 140 is compressed. As the moving member 170 moves, the first elastic member 180' is further compressed, and the second elastic member 185 is also compressed. As the magnetic body 140 moves further away from the inductor unit 120, the inductance (L) value of the inductor unit 120 gradually decreases. As the inductance value of the inductor unit 120 decreases, the resonant frequency changes.

[0226] (a) and (b) of Figure 25 are diagrams showing examples of assembly deviations occurring in the core body 102, and Figure 26 is a graph showing the change in resonant frequency depending on the pressure applied to the core body 102 for (a) and (b) of Figure 25, respectively.

[0227] (a) of Figure 25 is a diagram showing that due to an assembly deviation during the assembly process, the step portion 102T of the core body 102 is offset toward the magnetic body 140 and positioned almost attached to one side of the magnetic body 140, and (b) of Figure 25 is a diagram showing that due to an assembly deviation, the step portion 102T of the core body 102 is offset toward the inductor portion 120.

[0228] In the graph of FIG. 26, line (1) corresponds to FIG. 22, which represents the case where no assembly deviation occurs, line (2) corresponds to (a) in FIG. 25, and line (3) corresponds to (b) in FIG. 25.

[0229] 26, the stylus pen according to another embodiment of the present invention including the first elastic member 180′ has less change in performance compared to a case where there is no assembly deviation even if there is some assembly deviation in the core 102. Therefore, it has an advantage over the stylus pen 100 shown in FIG.

[0230] 22 to 24 does not use parts such as jumping capacitor 215, ring terminal 161, and connection terminals 165a and 165b in stylus pen 100 shown in Figures 9 to 16, which has the advantage of simplifying the internal structure and reducing manufacturing costs. Furthermore, groove 194 of second fixed member 190 shown in Figure 14 and part of first groove 177 of moving member 170 shown in Figure 13 are unnecessary in order to accommodate connection terminals 165a and 165b.

[0231] Meanwhile, although not shown in a separate drawing, a stylus pen according to another embodiment of the present invention may have the first elastic member 180 in the stylus pen 100 shown in FIG. 9 replaced with the first elastic member 180' shown in FIGS. 22 and 23.

[0232] Meanwhile, although not shown in a separate drawing, the ferrite core 121 and the buffer member 115 shown in FIG. 4 can be applied as is not only to the stylus pens mentioned in FIGS. 9 to 26 but also to other conventional stylus pens.

[0233] Figure 27 is a perspective view of a modified example of the ferrite core 121 shown in Figures 4 and 5, (a) of Figure 28 is an enlarged front view of a portion of the ferrite core 121' shown in Figure 27, and (b) of Figure 28 is a cross-sectional view taken along line A-A' in (a) of Figure 28.

[0234] 27 and 28, 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 allows the ferrite core 121' to be stably disposed inside the housing.

[0235] 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.

[0236] 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 27 and 28 may be arranged on only a portion of the outer surface of the lower end portion 121b'.

[0237] 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'.

[0238] The ferrite core 121′ shown in Figures 27 and 28 may 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′.

[0239] Figure 29 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 30 is a cross-sectional view showing only the ferrite core 121'' and the coil portion 123 shown in Figure 29, Figure 31 is an oblique view of the ferrite core 121'' shown in Figures 29 and 30, (a) of Figure 32 is an enlarged front view of a portion of the ferrite core 121'' shown in Figure 31, and (b) of Figure 32 is a cross-sectional view along B-B' in (a) of Figure 31.

[0240] 29 to 31, a ferrite core 121'' according to another modification includes an upper end 121a'' and a lower end 121b''.

[0241] The lower end 121b'' has a tapered shape, and the outer surface of the lower end 121b'' includes at least one step 121c''.

[0242] 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.

[0243] 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 curved inward or outward.

[0244] 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.

[0245] 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''.

[0246] The ferrite core 121'' shown in FIGS. 29 to 32 includes the step portion 121c'', and therefore can have substantially the same or similar effects as the ferrite core 121 shown in FIGS.

[0247] The ferrite core 121'' shown in FIGS. 29 to 32 may also be alternatively 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 part of the lower end 121b'' of the ferrite core 121''.

[0248] Figure 33 is an oblique view of a stylus pen 1000 according to another embodiment of the present invention, Figure 34 is a cross-sectional view of a portion of the stylus pen 1000 shown in Figure 33, and Figure 35 is an oblique view of the stylus pen 1000 shown in Figure 33 without the housing 1010.

[0249] 33 to 35, 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.

[0250] The housing 1010 may be made of a non-conductive synthetic resin material.

[0251] 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 function operation.

[0252] 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.

[0253] The core 1020 may be made of a non-conductive material.

[0254] 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 longitudinal direction 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 not covered by the outer shell portion 1025 and is exposed to the outside. The outer shell portion 1025 is made of a material that is relatively harder than the material of the base portion 1021, and reinforces and protects the base portion 1021.

[0255] 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.

[0256] 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 thinner toward the end of the one end of the housing 1010.

[0257] The buffer member 1150 has a conical or polygonal pyramid shape, and has a through hole penetrating one end of the ferrite core 1210 and a body portion between one end and the other end of the core body 1020. 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 body 1020. Here, the body portion of the core body 1020 refers to the portion of the core body 1020 that is elongated in one direction and is disposed within the through hole of the ferrite core 1210.

[0258] 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.

[0259] The buffer member 1150 has a shape that covers one end of the ferrite core 1210 .

[0260] 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 60° with respect to the contact surface.

[0261] 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).

[0262] The inductor section 1200 includes a ferrite core 1210 and a coil section 1230 wound around the outer surface of the ferrite core 1210 .

[0263] The ferrite core 1210 may have an overall cylindrical, elliptical, or polygonal cylindrical shape, and may have a through-hole 1210h formed therethrough along the longitudinal direction of the ferrite core 1210.

[0264] The ferrite core 1210 has a through-hole 1210h inside, through which the body of the core 1020 passes. The body of the core 1020 can move linearly back and forth along the longitudinal direction via the through-hole 1210h.

[0265] 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 inwardly curved portion 121c, as shown in FIG.

[0266] 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.

[0267] The coil portion 1230 may be wound in at least one layer around a ferrite core (1230).

[0268] 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 connecting 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.

[0269] 36 is a perspective view of only the fixing bracket 1600 shown in FIG. 25, FIG. 37 is a perspective view of the fixing bracket 1600 shown in FIG. 36 from another direction, and FIG. 38 is a partial perspective view of FIG. 35 from another direction.

[0270] 35 to 38 , 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 connected to the inductor portion 1200, and the other end of the fixing bracket 1600 may be connected to the board bracket 1900.

[0271] 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.

[0272] The first partition 1611 can be in contact with the other end of the ferrite core 1210, and the first partition 1611 has a through-hole 1610 through which the core body 1020 passes.

[0273] The inner wall 1622 may include a number of protrusions 1621 protruding into the insertion groove 1620. The number of protrusions 1621 may contact the outer surface of the other end of the ferrite core 1210 and serve to position the ferrite core 1210.

[0274] 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 may be located on the lower side. The locking portion 1960 of the board bracket 1900 may be coupled to the fixing bracket 1600, so that the fixing bracket 1600 is coupled to the board bracket 1900.

[0275] 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 longitudinal direction 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 longitudinal direction of the stylus pen 1000.

[0276] 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.

[0277] Fixed bracket 1600 is disposed to surround moving bracket 1300, elastic body 1700, and elastic member 1800. Fixed bracket 1600 may have an internal storage space 1640 in which moving bracket 1300, elastic body 1700, and elastic member 1800 are disposed. In storage space 1640 of fixed bracket 1600, moving bracket 1300 can move back and forth linearly.

[0278] 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).

[0279] 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, as another example, 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.

[0280] 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.

[0281] Due 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.

[0282] 39 is a perspective view of FIG. 35 excluding inductor section 1200 and fixing bracket 1600, FIG. 40 is a perspective view of FIG. 39 viewed from another direction, and FIG. 41 is a cross-sectional view of FIG.

[0283] 34 to 39, 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.

[0284] 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 that houses the other end of the core body 1020, the magnetic body 1400, and the protective member 1500.

[0285] 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 may be cylindrical and have a through-hole inside through which the other end of core body 1020 passes, and protective member 1500 may be cylindrical and have a through-hole inside through which the other end of core body 1020 passes.

[0286] 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.

[0287] 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 may be synchronized with the moving bracket 1300.

[0288] 38 , the protective member 1500 may include a protrusion 1510 that protrudes outward from the outer surface. The protrusion 1510 may be sandwiched in an insertion groove 1310 formed in the moving bracket 1300. The protective member 1500 may be stably fixed to the moving bracket 1300 by the protrusion 1510 of the protective member 1500 and the insertion groove 1310 of the moving bracket 1300, and thus the other end of the core body 1020 may be fixed to the moving bracket 1300.

[0289] 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. 35. 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.

[0290] 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. 35 . When the moving bracket 1300 moves in synchronization with the movement of the core body 1020, the third protrusion 1350 can move along the guide hole 1650 of the fixed bracket 1600.

[0291] The moving bracket 1300 may include an extension 1370. The extension 1370 may extend along the longitudinal direction of the stylus pen 1000 on the outer surface of the moving bracket 1300. Alternatively, the extension 1370 may extend along the longitudinal direction 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.

[0292] 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.

[0293] 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. 35, and may be electrically isolated from the electrode pattern 1690 of the fixed bracket 1600 by movement of the core body 1020.

[0294] 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).

[0295] The electrode pattern 1390 may include a base electrode pattern 1391 and first and second extension patterns 1393a and 1393b.

[0296] 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.

[0297] 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 contact the electrode pattern 1690 of the fixing bracket 1600 shown in FIG. 35 or may be released from contact with the electrode pattern 1690 due to movement of the core body 1020.

[0298] 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 an 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.

[0299] 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.

[0300] 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. The connecting wire 1710 may have one end connected to the elastic body 1700 and the other end connected to the terminal portion 2110 of the substrate 2100.

[0301] To protect and guide the connecting wire 1710, the elastic member 1800 and the board bracket 1900 may have a guide groove in which the connecting wire 1710 is disposed.

[0302] 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.

[0303] The elastic member 1800 may be disposed between the moving bracket 1300 and the base bracket 1900 .

[0304] 42 is a perspective view of only the elastic member 1800 shown in FIG. 39, and FIG. 43 is a perspective view of the board bracket 1900 and the board 2100 shown in FIG.

[0305] 36 to 43 , the elastic member 1800 may include an extension 1870. The extension 1870 may extend in a lateral 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.

[0306] 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 longitudinal direction of the stylus pen 1000. The connecting line 1710 of the elastic body 1700 may be disposed in the guide groove 1810.

[0307] 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. The elastic member 1800 may be stably and securely mounted to the board bracket 1900 via this.

[0308] 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 .

[0309] The substrate bracket 1900 may include sides 1940 that guide and support the sides of the substrate 2100 .

[0310] 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 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.

[0311] 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.

[0312] The substrate 2100 is placed on the substrate bracket 1900 .

[0313] 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.

[0314] 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.

[0315] 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.

[0316] FIG. 44 is a diagram illustrating the movement of the moving bracket 1300 due to the movement of the core body 1020 shown in FIGS. 35 to 43, and the electrical contact and disconnection between the fixed bracket 1600 and the moving bracket 1300.

[0317] Figure 44(A) shows the state when no external force is acting on the core body 1020, and Figure 44(B) shows the state when a predetermined external force is acting on the core body 1020 and the moving bracket 1300 moves in one direction.

[0318] 44A, if 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.

[0319] The elastic body 1700 presses the second protrusion 1330b of the movable bracket 1300 toward the core body 1020, 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.

[0320] 44(B), when a predetermined external force acts on the core body 1020 and causes the core body 1020 to move 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, causing the electrode pattern 1390 of the movable bracket 1300 to be 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.

[0321] 44(B), when a predetermined external force acts on 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.

[0322] 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 may be configured to be more dominant than the change in inductance. In the limited space inside the housing of the stylus pen, it is easier to suddenly change the capacitance than to suddenly change the inductance. However, in some cases, the change in inductance may be configured to be more dominant than the change in capacitance. Alternatively, the change in capacitance and the change in inductance may be configured to have almost similar characteristics. In any of the three cases above, the movement of the moving bracket 1300 changes both the capacitance and inductance, 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.

[0323] Figure 45 is a schematic diagram of (A) and (B) of Figure 44, and Figure 46 is a simplified equivalent circuit diagram of a stylus pen according to another embodiment of the present invention, which corresponds to (A) and (B) of Figure 44.

[0324] 45 and 46A and 46B, 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 moving bracket 1300 contact or contacts each other.

[0325] 45A and 46A, 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.

[0326] 45B and 46B, if 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.

[0327] 46(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.

[0328] If the external force applied to the core body 1020 is not strong enough to separate both 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 remains connected in parallel with the basic capacitors C1, C2, and C3.

[0329] 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 1020 is strong enough to completely separate both 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, a reference pressure for distinguishing between hover and contact can be clearly set, 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 and 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 contact with one electrode pattern that is different from the other extension pattern, thereby advantageously allowing a clear distinction between the hover state and the contact state.

[0330] Figure 47 is an oblique view of a stylus pen 1000 according to another embodiment of the present invention shown in Figure 33, viewed from the side of the core body 1020, (A) of Figure 48 is a portion of a cross-sectional view of the stylus pen 1000 shown in Figure 47 taken along line A-A', (B) of Figure 48 is a portion of a cross-sectional view of the stylus pen 1000 shown in Figure 47 taken along line B-B', and Figure 49 is a drawing showing side views A and B and a cross-sectional view of the ferrite core 1210 shown in Figures 47 and 48.

[0331] Referring to Figures 35, 47 to 49, the housing 1010 of the stylus pen 1000 has a rectangular cylindrical shape with rounded corners, and the portion where a portion of the core body 1020 is exposed from the housing 1010 has a shape in which its width becomes narrower as it goes outward.

[0332] The components disposed 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.

[0333] As shown in Figures 48A and 48B, the ferrite core 1210 has a first cross-sectional shape cut in a first vertical direction (direction A-A' in Figure 47) perpendicular to the axial direction x of the ferrite core 1210 (or the longitudinal direction of the stylus pen 1000) that is different from a second cross-sectional shape cut in a second vertical direction (direction B-B' in Figure 47). Specifically, the thickness w1 of the ferrite core 1210 in the first vertical direction is different from the thickness w2 in the second direction. More specifically, the thickness w1 in the first vertical direction is smaller than the thickness w2 in the second 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.

[0334] The ferrite core 1210 has a tubular 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.

[0335] One end of the ferrite core 1210 may include at least two or more curved portions 1210c. As shown in FIGS. 48A and 48B, at least a portion of the curved portion 1210c appears in the second cross-sectional shape and does not appear in the first cross-sectional shape. The curved portion 1210c may be a curved surface that curves toward the through hole 1210h from one side surface of the one end of the ferrite core 1210 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.

[0336] As shown in (1), (2), and (3) of Fig. 49, 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. (3) of Fig. 49 shows that the curved surface portion 1210c has an aspherical shape, (1) of Fig. 49 shows that the curved surface portion 1210c has a spherical shape, and (2) of Fig. 49 shows that the curved surface portion 1210c has a shape intermediate between the aspherical and spherical shapes.

[0337] 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.

[0338] 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.

[0339] 47 to 49 may be applied to the stylus pen shown in Fig. 3 or 22. Furthermore, the ferrite core of the stylus pen shown in Fig. 3 or 22 may be applied to the stylus pen of Fig. 33.

[0340] Figure 50 is a diagram for explaining a modified example of the ferrite core 1210 shown in Figure 49, and Figure 51 is a perspective view of an inductor part 1200' in which a coil 1230' is wound on the outer surface of the ferrite core 1210' shown in Figure 50.

[0341] Referring to FIG. 50, the ferrite core 1210' has a cylindrical shape.

[0342] One end of the ferrite core 1210′ may include a curved portion 1210c′. The curved portion 1210c′ may be a curved surface that curves toward 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.

[0343] 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.

[0344] As shown in (1), (2), and (3) of Fig. 50, the curved portion 1210c' has a constant inner diameter and an outer diameter that decreases in the axial direction x of the ferrite core 1210'. Here, the inner diameter defines the through hole 1210h. Alternatively, as shown in (1), (2), and (3) of Fig. 50, the thickness between the outer diameter and the inner diameter of the curved portion 1210c' gradually decreases in the axial direction x of the ferrite core 1210'.

[0345] 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 end (where (3) is located), a middle end (where (2) is located), and a lower end (where (1) is located), the rate at which the outer diameter or the thickness decreases from the upper end to the middle end may be relatively greater than the rate at which the outer diameter or the thickness decreases from the middle end to the lower end. In other words, the rate at which the outer diameter or the thickness decreases from the upper end to the middle end may be relatively steep, and the rate at which the outer diameter or the thickness decreases from the middle end to the lower end may be relatively gradual.

[0346] Referring to FIG. 51, a coil 1230' may be wound around the outer surface (or peripheral surface) of a ferrite core 1210'.

[0347] 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. 47. 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.

[0348] 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.

[0349] 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. A ferrite core is attached to the inside of a stylus pen and has a through hole formed along the longitudinal direction of the stylus pen, the ferrite core has a first cross-sectional shape in a first perpendicular direction perpendicular to the longitudinal direction and a second cross-sectional shape in a second perpendicular direction perpendicular to the longitudinal 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 toward the through hole side from one side surface of one end of the ferrite core to a portion of the ferrite core adjacent to the through hole. Ferrite core.

2. 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 1 , wherein at least a portion of the curved surface portion appears only in the second cross-sectional shape.

3. The ferrite core according to claim 1 , wherein the curved surface portion is configured so that its shape changes from an aspherical shape to a spherical shape as it goes from the other end of the ferrite core toward the one end.

4. 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 longitudinal direction; The ferrite core according to claim 1 , wherein the flat portion at one end of the ferrite core is configured so that the width of the flat portion gradually narrows toward the one end of the ferrite core.

5. 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 longitudinal 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 has a first cross-sectional shape in a first perpendicular direction perpendicular to the longitudinal direction and a second cross-sectional shape in a second perpendicular direction perpendicular to the longitudinal 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 that curve toward the through hole side from one side surface of one end of the ferrite core to a portion of the ferrite core adjacent to the through hole.

6. The stylus pen according to claim 5 , further comprising a magnetic body disposed inside the moving bracket, surrounding the other end of the core body, and interlocking with the moving bracket.

7. The stylus pen according to claim 6 , further comprising a protective member disposed inside the moving bracket, surrounding the other end of the core body together with the magnetic body, and pressing the core body between the core body and the moving bracket.

8. a base bracket fixedly disposed within the housing and coupled to the other end of the fixed bracket; The stylus pen according to claim 5 , 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.

9. 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 an empty space therein, 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 an empty space of the elastic body.

9. The stylus pen according to claim 8.

10. 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 comes into contact with or moves away from the pair of electrode patterns as the core body moves, 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 9 , wherein a pair of electrode patterns of the fixing bracket are respectively connected to second and third terminals of the substrate.

11. 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 10 , wherein the second and third terminals are connected in parallel to the other end of the capacitor.

12. 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 according to claim 10 , wherein the electrode pattern of the moving bracket is plated into a groove formed in the outer surface of the moving bracket.

13. The stylus pen according to claim 8 , wherein the resonant frequency of the resonant circuit is changed by movement of the moving bracket synchronized with movement of the core.

14. The stylus pen of claim 13 , wherein, at a point in time 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.

15. 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 5 , wherein at least a part of the curved surface portion appears only in the second cross-sectional shape.

16. The stylus pen according to claim 5 , wherein the curved surface of the ferrite core is changed from an aspherical shape to a spherical shape at the other end of the ferrite core toward the one end.

17. 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 longitudinal direction; The stylus pen according to claim 5 , wherein the flat portion at one end of the ferrite core is configured so that the width of the flat portion gradually narrows toward the one end of the ferrite core.

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