Ferrite core and stylus pen 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 capable of improving 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 a screen to drag or click. A user uses 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 have a battery and electronic components inside.

[0004] Active stylus pens have the advantage of being superior in basic performance compared to passive stylus pens and providing additional functions (pressure, hovering, buttons), but they have the disadvantage that the pen itself is expensive and requires a power source to be charged, so there are only a few high-end users.

[0005] Passive stylus pens have the advantages of being cheaper and not requiring batteries compared to active stylus pens, but have the disadvantage of being more difficult to recognize precise touches than active stylus pens. Recently, however, in order to realize passive stylus pens capable of precise touch recognition, technologies based on the inductive resonance method, EMR (Electro Magnetic Resonance) and capacitive resonance, have been proposed.

[0006] The EMR method has the advantage of the quality of writing / drawing, which is the core function of a stylus pen, but it has the disadvantage of being thick and expensive 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 the touch sensor to more accurately identify the touch by the 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 almost the same as the resonance frequency of the resonance circuit built into the stylus pen. However, in the conventional EMR or capacitive resonance method, even if the resonance frequency and the frequency of the drive signal match, there is a problem that the attenuation of the signal transmission is very large, making it difficult to transmit the signal. As a result, despite many years of attempts by many touch controller IC vendors, there is still a lack of sufficient output signals, and no vendor has yet succeeded in mass production.

[0009] Therefore, in order to manufacture an EMR type or capacitive resonant stylus pen capable of generating a maximum output signal, how the internal resonant circuit and the structure of the pen are designed 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 a conventional stylus pen, 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 inclined at a predetermined angle (eg, 60°) 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 inside the housing 19. However, even when the pen tip is pushed in this manner and tilted at a certain angle (e.g., 60°), some stylus pens 10a, 10b should be able to draw without any problems.

[0014] In other words, when the conventional stylus pens 10a and 10b are tilted with respect to the contact surface 31, the external mechanisms (eg, the 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, an inductor section 13 and 13', a capacitor section 15, and a housing 19. In addition to these, there are other additional configurations.

[0017] The inductor parts 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 section 13, 13' and the capacitor section 15 are electrically connected to each other to form an LC resonator section, which can resonate with a drive signal provided from a transmitter side 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 Fig. 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 toward the bottom end (hereinafter, referred to as a taper shape). Through the taper shape, the ferrite core 131' can be arranged closer to the bottom end side (or the pen tip side) in 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 change depending on the position of the inductor units 13 and 13' in 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 disposed 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 a limit in maximizing the magnitude of the pen signal received by the receiver.

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

[0023] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide a ferrite core 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 improving the magnitude of a pen signal received at a receiver and a stylus pen including the same.

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

[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 capable of miniaturizing 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 enables drawing even when tilted at a predetermined angle, and a stylus pen including 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, the ferrite core having 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, the ferrite core including 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 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, the core body being configured to move along a longitudinal direction in response to an external force acting on the one end, an inductor unit including a ferrite core disposed inside the housing and 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, the inductor unit including a coil wound on an outer surface of the ferrite core, the fixing bracket being fixedly disposed inside the housing and coupled to the other end of the ferrite core, and the fixing bracket being fixedly disposed inside the fixing bracket and surrounding the other end of the core body. and a movable bracket configured to work in conjunction with the core body and be synchronized 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 side from one side of the one end of the ferrite core to a portion adjacent to the through hole of the ferrite core. Effect 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] Also, there is an advantage that the magnitude of the pen signal received at the receiver side 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 description 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 portion A of the stylus pen 100 shown in FIG.

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

[0046] 6(a) and 6(b) are diagrams illustrating an 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] 7(a) to 7(c) are diagrams for explaining in more detail the internal configuration of the stylus pen according to the embodiment of the present invention shown in FIGS. 4 and 5 and the effects thereof.

[0048] FIG. 8 is a diagram for explaining the amount of increase in the magnitude of the pen signal according to a 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 structures 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 case shown in FIG. 10(a) with the inner case 110 removed.

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

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

[0054] 14(a) and (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 FIG. 9 and 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 an assembly deviation of the core body 102 when assembling the stylus pen 100 shown in FIGS.

[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.

[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 (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 FIG. 22 to FIG.

[0066] 25(a) and (b) are views showing an example in which an assembly deviation occurs in the core body 102. 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] FIG. 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] FIG. 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 part of a 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 for explaining the movement of the moving bracket 1300 accompanying the movement of the core body 1020 shown in FIGS. 35 to 43, and electrical contact and release between the fixed bracket 1600 and the moving bracket 1300. As shown in FIG.

[0086] FIG. 45 is a schematic diagram of (A) and (B) of FIG. 44.

[0087] FIG. 46 shows a simplified stylus pen according to another embodiment of the present invention, configured in the form of 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 the other embodiment of the present invention shown in FIG. 33, viewed from the side of the core body 1020. 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 B-B'.

[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 portion 1200' in which a coil 1230' is wound on the outer surface of the ferrite core 1210' shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[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 present invention may be practiced. These embodiments are described in sufficient detail to enable those skilled in the art to practice the present invention. It should be understood that the various embodiments of the present invention are different from one another, but are not necessarily mutually exclusive. For example, a specific shape, structure, and characteristic described herein may be embodied in other embodiments without departing from the spirit and scope of the present invention. It should also be understood that the location or arrangement of individual components within each disclosed embodiment may be changed without departing from the spirit and scope of the present 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, together with the full scope of equivalents that such claims, if properly interpreted, are to be given. In the drawings, like reference numerals refer to the same or similar features 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 therein 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 integral 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 disposed on the housing 101. The button unit 109 may be disposed on the outer surface in the middle of the second housing 101b. The button unit 109 may be for performing a specific operation of the stylus pen 100. For example, the button unit 109 may be a mechanical or contact button for a cancel operation.

[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] Due to an external force from the outside, a portion of one end of the core body 102 may move into the housing 101. As the external force increases, the volume of the portion of the one end of the core body 102 entering the housing 101 may increase. When the applied external force decreases, the portion of the one end of the core body 102 will come out of the housing 101 again due to the mechanical action of the parts 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 now be described with reference to FIGS.

[0104] FIG. 4 is a cross-sectional view of portion 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 disposed inside a housing 101, an inductor unit 120, and a capacitor unit (not shown).

[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 penetrate. 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 a 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 can block electrical or magnetic influences from the outside.

[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 L1, which is commonly tangent to the tapered portion 101t of the housing 101 and a portion of the core body 102 (or the pen tip) disposed outside the housing 101, forms a predetermined angle θ with the central axis Y of the core body 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 constitute an LC resonator together with a capacitor unit (not shown). A resonant frequency may be set according to an inductance (L) value of the inductor unit 120 and a capacitance (C) value of the capacitor unit (not shown). The resonant frequency may be varied according to a change in the inductance (L) value of the inductor unit 120 or a 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 tubular shape, and may have a through hole 121h formed therein along the longitudinal direction of the ferrite core 121.

[0115] The ferrite core 121 has a through-hole 121h therein through which the body 102a of the core 102 passes. The body 102a of the core 102 can linearly reciprocate 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 surface portion 121c 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. Here, 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 having 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 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 lower end 121b has a tapered shape that narrows from top to bottom, but at least a portion of the outer surface of the lower end 121b has a curved surface portion 121c that curves inwardly of the lower end 121b. The number of curved surface 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 surface portion 121c will be described below with reference to the drawings.

[0122] Figures 6(a) and 6(b) are diagrams for explaining the internal configuration and effects of the stylus pen according to an embodiment of the present invention shown in Figures 4 and 5. In particular, 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 side (not shown) arranged under the core body 102 of the stylus pen. Therefore, there is an advantage that the magnitude of the pen signal sensed by the receiver side 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. Hereinafter, a detailed description will be given with reference to FIG. 7.

[0125] Figures 7(a) to (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 to 5. In particular, 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 the inner surface and the outer surface. The more the thickness T2 is minimized, the lower the ferrite core 131' can be disposed as far as possible within the tapered portion 101t of the housing 101. However, the thickness T2 is limited due to the structure of the buffer member 115' and other manufacturing process reasons.

[0127] Here, if we assume 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 will be as shown in Figure 7(a).

[0128] Referring to Fig. 7(c), although the ferrite core 121 is arranged at the same position as the ferrite core 131' in Fig. 7(a), 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 Fig. 7(a). 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 on the outside.

[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 end and the lower end 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 Fig. 7(c), at least a part (the upper end and the lower end) 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 Fig. 7(a) when manufacturing the buffer member 115''.

[0131] Referring to Fig. 7(b), 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 end and the lower end of the inner surface of the buffer member 115 have a thickness of T3 (<T2) from 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 from the outer surface of the buffer member 115.

[0132] In Fig. 7(b), the minimum thickness T2 cannot be met at the top and bottom of the buffer member 115, but the minimum thickness T2 is met at the middle part of the buffer member 115, so that the buffer member 115 may be manufactured. The buffer member 115 manufactured in this manner has a smaller minimum thickness than the buffer members 115' and 115'' shown in Figs. 7(a) and 7(c), so that 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 thus the ferrite core 121 can be disposed further downward by a predetermined height S from Figs. 7(a) and 7(c).

[0133] FIG. 8 is a diagram for explaining the amount of increase in the magnitude of the pen signal according to a 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 shape of the tapered portion of the ferrite core 121 of the inductor unit 120 is different from that of the conventional ferrite core 131', so that the thickness of the buffer member 115 can be further reduced and the ferrite core 121 can be disposed closer to the end of the core body 102 inside the housing 101. Therefore, a larger pen signal can be obtained from a receiver side receiving a pen signal emitted from the stylus pen 100 according to an embodiment of the present invention, and thus the detection sensitivity of the stylus pen at the receiver side can be improved.

[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 views of the first fixing member 13 shown in FIGS. 9 and 11. 13A and 13B are perspective views of the movable member 170 shown in FIGS. 9 and 11 from various sides, FIGS. 14A and 14B are perspective views of the second fixed member 190 shown in FIGS. 9 and 11 from various sides, FIG. 15 is a perspective view of a portion of the configuration shown in FIGS. 9 and 11 from one side, and FIGS. 16A and 16B 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 surrounding 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 play a role in protecting various components disposed therein 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 number 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 multiple extension grooves 111e may be formed at positions corresponding to the multiple first protrusions 131, 192. As an example, the first opening 111 may have an "E" shape.

[0142] The inner case 110 can be rotated counterclockwise or clockwise around the core body 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, since 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 body 102 caused by an external force.

[0143] The inner case 110 may have a second opening 113 in which the extension coils 125a, 125b are disposed and through which the connection terminals 165a, 165b are exposed. The second opening 113 provides a space for disposing the extension coils 125a, 125b and can protect the extension coils 125a, 125b from external impact. In addition, the attachment positions of the connection terminals 165a, 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 body 102 and the inner case 110. The buffer member 115 has a through hole through which the core body 102 passes. Such a buffer member 115 can guide the position of the core body 102, stably fix the inductor section 120, and block the inductor section 120 from external electrical or magnetic influences. Such a 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 through which the core body 102 passes. The core body 102 can perform linear reciprocating motion 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 may extend along the longitudinal direction and be connected to coil electrodes 213a and 213b arranged on the substrate 210, respectively.

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

[0148] The inductor section 120 may be fixed to one side of the first fixing member 130. Here, a portion of the inductor section 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 unit. A resonant frequency may be set according to an inductance (L) value of the inductor unit 120 and a capacitance (C) value of the capacitor unit (not shown). Since the inductance (L) value of the inductor unit 120 changes according to the movement of the magnetic body 140, the resonant frequency may be variable.

[0150] The capacitor unit (not shown) is disposed on the substrate 210. It has a preset 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 as a circuit to be electrically connected to the connection terminals 165a and 165b. For example, the jumping capacitor 215 may be electrically connected to the connection pads 211a and 211b disposed on the substrate 210 via the conductive patterns 212a and 212b. The jumping capacitor 215 may be electrically connected to or separated from the basic capacitor according to the movement of the core body 102. When no external force is applied to the core body 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 basic capacitor. On the other hand, when an external force is applied to the core body 102 and the movable member 170 linked to the core body 102 moves toward the first elastic member 180, the ring terminal 161 separates from the connection terminals 165a, 165b. 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 body 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.

[0155] A number of first grooves 135 in which the extensions 171 of the movable member 170 are respectively disposed may be formed on the outer surface of the first fixing member 130. Also, a second groove 137 may be formed on the outer surface of the first fixing member 130 along the longitudinal direction to maintain 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 perform linear reciprocating motion 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 moving member 170 is disposed inside the inner case 110. The moving member 170 has an overall cylindrical shape. The moving member 170 has a first cavity 173a and a second cavity 173b. A part of the first elastic member 180 shown in FIG. 9 is disposed in the first cavity 173a, and a part 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 number of extensions 171 are disposed on the outer surface of the movable member 170 to be disposed in the number of first grooves 135 of the first fixed member 130. The number 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 number 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 member 190 shown in Fig. 14 are respectively disposed. The second grooves 175 are also moved together by the linear reciprocating motion of the movable member 170 along the longitudinal direction, so that the position of the second extensions 193 of the second fixed member 190 disposed in the second grooves 175 may change.

[0160] The second groove 175 of the moving member 170 may have a shape corresponding to the second extension portion 193 of the second fixing member 190. The second groove 175 may have a shape that prevents the second extension portion 193 of the second fixing member 190 from completely detaching from the second groove 175 when the moving member 170 moves away from the second fixing member 190. For this reason, the second groove 175 may have a shape in which the width of the second groove 175 becomes narrower toward the second fixing member 190, and the second extension portion 193 of the second fixing 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 an outer surface of the moving member 170. The first groove 177 is formed long along the longitudinal direction, and the connection terminals 165a and 165b may be disposed in the first groove 177 as shown in Fig. 16(b). The first groove 177 may fix and guide the positions of the connection terminals 165a and 165b. In addition, a first extension portion 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 portion 171 of the movable member 170 is disposed in the first groove 135 of the first fixed member 130, and the first and second extension portions 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 will 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 Figures 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 portion 199 and a second extension portion 193 extending from one surface 191a of the base portion 191 toward the movable member 170. A plurality of the first extension portions 199 and the second extension portions 193 may be arranged on the one surface 191a of the base portion 191. Specifically, two first extension portions 199 may be arranged to face each other, and two second extension portions 193 may be arranged to face each other. The plurality of first and second extension portions 191, 199 may guide the outer surface of the second elastic member 185 shown in FIG. 9 from all four sides. Therefore, the position of the second elastic member 185 may be fixed by the plurality of first and second extension portions 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 FIGS.

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

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

[0170] The second fixing member 190 may include a mounting portion 196 extending along 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, 16(a) and 16(b), the core body 102 is formed to extend a predetermined length along the longitudinal direction, and one end portion may have a pointed shape. Here, the one end portion is exposed to the outside of the housing 101.

[0173] The core body 102 includes a step portion 102T disposed in a part of the middle portion between one end and the other end. The thickness of one end and the other end of the middle portion may be different from each other with respect to the step portion 102T. The first thickness D1 of one end of the middle portion with respect to the step portion 102T may be formed thicker than the second thickness D2 of the other end of the middle portion. With such a 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 be moved together with the core body 102. That is, when the core body 102 moves, the step portion 102T can push one surface of the magnetic body 140 to move the magnetic body 140 in the longitudinal direction. As the magnetic body 140 moves along the longitudinal direction, the separation distance between the inductor portion 120 and the magnetic body 140 changes. The change in the distance changes the inductance (L) value of the inductor portion 120, and the change in the inductance value changes the resonance 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 detects the writing pressure applied to the core 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 part of the core body 102 passes. The diameter of the through hole may be the same as 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 perform linear reciprocating motion 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 brings the magnetic body 140 into close contact with the partition wall 132 of the first fixing member 130.

[0180] The ring terminal 161 is circular with an empty interior and electrically connects the two connection terminals 165a and 165b. The shape of the ring terminal 161 is not limited to a circle, but may be a polygon.

[0181] The ring terminal 161 is disposed on one surface of the moving member 170 and moves in conjunction with the moving member 170. In other words, 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 is separated from the ring terminal 161, and the other side that is connected to the substrate 210. The one side may contact or be separated 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] The connection terminals 165a and 165b each include 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 a first groove 177 of the moving member 170 shown in FIG. 13 and in a groove 194 of the second fixing member 190 shown in FIG. 14, and may be guided by a first extension portion 199 of the second fixing 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 smaller thickness in the longitudinal direction than the first elastic member 180 and a larger 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 by 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] (a) to (c) of Fig. 17 are diagrams for explaining the operation of the stylus pen 100 shown in Fig. 9 to Fig. 16. Specifically, (a) of Fig. 17 is a diagram showing a hover state H of the stylus pen 100, (b) of Fig. 17 is a diagram showing a contact state C of the stylus pen 100, and (c) of Fig. 17 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 maintain a state of contact with each other.

[0193] Referring to FIG. 17(b), in the contact state C, a certain pressure is applied to one end of the core 102. The applied pressure causes the core 102 to move inwardly 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 separates from the connecting terminals 165a and 165b. As a result, the jumping capacitor 215 shown in FIG. 9 is electrically disconnected from the basic capacitor, and the total capacitance of the capacitor unit (not shown) decreases. Here, since the magnetic body 140 does not move, the inductance value of the inductor unit 120 remains unchanged. Since 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 body 102. The greater pressure causes the core body 102 to move further toward the inside of the housing 101, and the magnetic body 140 is pushed by the step portion 102T of the core body 102. The magnetic body 140 is pushed, and the elastic body 155 disposed between the cover portion 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. Here, since the magnetic body 140 moves away from the inductor unit 120, the inductance (L) value of the inductor unit 120 gradually decreases. Here, the capacitance of the capacitor unit (not shown) is maintained the same as in the contact state C. Since the inductance value of the inductor unit 120 decreases, the resonant frequency changes.

[0195] Fig. 18(a) shows an example of the change in the LC value of the resonant circuit unit due to the operations of Fig. 17(a) to (c), where the Th section shows the hover state of Fig. 17(a), the Tc point shows the contact state of Fig. 17(b), and the Tp section shows the writing pressure state of Fig. 17(c). Fig. 18(b) is a graph showing the frequency characteristics in each of the operation states of Fig. 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 decreases rapidly immediately (Tc) after the core 102 contacts the touch surface. In addition, in a section (Tp) in which 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>contact state>writing pressure state. In addition, immediately after the core 102 contacts the touch surface, the amount of change in the LC value may be greater than in a state in which the writing pressure gradually increases thereafter.

[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 may 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 increase in resonant frequency (hover state<contact state<pressure state) and decrease in Q value (hover state>contact state>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 change in phase 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, the contact and writing pressure of the stylus pen 100 with the stylus pen sensing device can be detected.

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

[0200] Meanwhile, in the stylus pen according to the embodiment shown in Figures 9 to 16, an assembly deviation may occur during the assembly process. The assembly deviation 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 an assembly deviation of the core body 102 when assembling the stylus pen 100 shown in FIGS.

[0202] Specifically, Figure 19(a) shows a case where the core body 102 is installed as designed without any assembly deviation, and 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 located in a 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 disposed 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 disposed 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 disposed 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] In the case of Fig. 19(b) where an assembly deviation occurs, even if pressure is continuously 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 immediately. 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 resonance 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 FIG. 20, the (1) line showing no assembly deviation corresponds to FIG. 19(a), the (2) line showing assembly deviation corresponds to FIG. 19(c), and the (3) line showing assembly deviation corresponds to FIG. 19(b).

[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. In this way, due to the assembly deviations of (b) and (c) in FIG. 19, it may be difficult for the stylus pen sensing device to accurately sense 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.

[0209] Specifically, FIG. 21(a) shows a case where connection terminals 165a, 165b are installed as designed without any assembly deviation, and FIG. 21(b) and FIG. 21(c) show a case where connection terminals 165a, 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. The position of the connection terminal 165a is properly assembled without deviation. On the other hand, in FIG. 21(b) and (c), the connection terminal 165a is disposed in a position other than the previously designed position due to an assembly deviation of the connection terminal 165a. Specifically, in FIG. 21(b), the connection terminal 165a is offset a predetermined distance toward the substrate 210, and the one end 165a1 presses the ring terminal 161 with a considerable force. In FIG. 21(c), the connection terminal 165a is offset a predetermined distance toward the first fixing member 130, and the 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 of being pressed against each other, so there is a problem that the pressure required to recognize the contact state of Fig. 17(b) increases. Meanwhile, in the case of Fig. 21(c), the ring terminal 161 and the connection terminal 165a are separated from each other from the hover state of Fig. 17(a), so even if pressure is applied to the core body 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 configuration is reduced to reduce manufacturing costs.

[0213] The stylus pen shown in Fig. 22 is different from the stylus pen 100 shown in Fig. 9 to Fig. 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, the connection terminals 165a and 165b, the jumping capacitor 215, and the configuration for electrically connecting them are omitted from the stylus pen 100 shown in Fig. 9 to Fig. 17. The remaining configurations other than these are the same as those of the stylus pen 100 shown in Fig. 9 to Fig. 17, so a detailed description will be given below with respect to the configurations that are different, instead of the above description.

[0214] 22, the first elastic member 180' is configured as a spring. The first elastic member 180' can be arranged to start compressing at a low pressure (for example, around 10 gf) and be compressed quickly even if the pressure increases slightly because the compressive strength is weak.

[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 Fig. 23(b), the first elastic member 180' may be sandwiched between the moving member 170 and the second fixed member 190 and placed in a partially compressed (or incompletely compressed) state. The first elastic member 180' is not compressed unless a force (or repulsive force) greater than the force compressed by the moving 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 is compressed if a force greater than the force compressed by the moving member 170 is applied through the moving member 170.

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

[0218] In <Formula 1> on TIFF2025013305000002.tif18142, G is the transverse elastic modulus of the spring, Na is the effective number of 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 spring compressed (in the negative direction).

[0219] Meanwhile, the first elastic member 180' may be disposed in an uncompressed state between the moving member 170 and the second fixed member 190. Therefore, the stylus pen according to another embodiment of the present invention is not limited to the first elastic member 180' disposed between the moving 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 to 23. Specifically, Figure 24 (a) is a diagram showing a hover state H of the stylus pen, Figure 24 (b) is a diagram showing a contact state C of the stylus pen, and Figure 24 (c) is a diagram showing a 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 the contact state C, a predetermined pressure acts on one end of the core body 102. The applied pressure causes the core body 102 to move inward of the housing 101. As the core body 102 moves, the cover part 150 pushes the moving member 170 toward the first elastic member 180', and the moving member 170 is pushed to 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 body 102 moves, the step part 102T of the core body 102 pushes the magnetic body 140 toward the first elastic member 180'. The magnetic body 140 is pushed, and the distance between the inductor part 120 and the magnetic body 140 changes. This change in distance changes the inductance value of the inductor part 120, and finally changes the resonant frequency.

[0225] 24(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 body 102. The greater pressure causes the core body 102 to move further toward the inside of the housing 101, and thus the magnetic body 140 moves further away from the inductor unit 120. The magnetic body 140 is pressed, and the elastic body 155 disposed between the cover unit 150 and the magnetic body 140 is compressed, and the first elastic member 180' is further compressed by the movement of the moving member 170, and the second elastic member 185 is also compressed. Here, 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] Figures 25 (a) and (b) are drawings showing an example of assembly deviation occurring in the core body 102, and Figure 26 is a graph showing the change in resonant frequency due to pressure applied to the core body 102 for each of Figures 25 (a) and (b).

[0227] (a) of Figure 25 is a diagram showing that due to 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 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 assuming that no assembly deviation occurs, line (2) corresponds to FIG. 25(a), and line (3) corresponds to FIG. 25(b).

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

[0230] 22 to 24 does not use the jumping capacitor 215, the ring terminal 161, and the connection terminals 165a and 165b of the stylus pen 100 shown in Fig. 9 to 16, and therefore has the advantage of being able to simplify the internal structure and reduce the manufacturing cost. Furthermore, in order to arrange the connection terminals 165a and 165b, the groove 194 of the second fixed member 190 shown in Fig. 14 and a part of the first groove 177 of the moving member 170 shown in Fig. 13 are not necessary.

[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 not only to the stylus pens mentioned in FIGS. 9 to 26 but also to other conventional stylus pens.

[0233] Figure 27 is an oblique 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 along A-A' in (a) of Figure 28.

[0234] 27 to 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'. Such 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 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 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 to 28 may be alternatively applied to the stylus pen shown in Figures 9 to 26. In this case, a buffer member (not shown) may have a shape capable of covering a part 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' of (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 portion 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 between 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 may 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 alternatively be applied to the stylus pen shown in Figs. 9 to 26. In this case, a buffer member (not shown) may have a shape capable of covering a part of the lower end portion 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, integral 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 constructed from a non-conductive material.

[0254] The core body 1020 may include a base part 1021 and an outer shell part 1025. The base part 1021 has an elongated shape extending along the longitudinal direction of the stylus pen 1000. The outer shell part 1025 surrounds the side of the base part 1021. One side end of the base part 1021 is not covered by the outer shell part 1025 and is exposed to the outside. The outer shell part 1025 is made of a material that is relatively harder than the material of the base part 1021, and reinforces and protects the base part 1021.

[0255] Due to an external force from the outside, a portion of one end of the core body 1020 may move 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 may increase. If the applied external force decreases, the portion of the one end of the core body 1020 will again move out of the housing 1010. If the external force is removed, the portion of the one end of the core body 1020 will return 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. An inner surface defining the through hole may have a shape corresponding to an outer surface of one end of the ferrite core 1210 and an outer surface of the body portion of the core body 1020. Here, the body portion of the core body 1020 refers to a portion of the core body 1020 having an elongated shape in one direction that 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 electrical or magnetic influences from the outside.

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

[0260] An imaginary tangent line commonly contacting the tapered portion 1010t of the housing 1010 and a portion of the core body 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 in a state inclined at 60° to the contact surface.

[0261] The inductor unit 1200 may constitute an LC resonator together with a capacitor unit (not shown). A resonant frequency may be set according to an inductance (L) value of the inductor unit 1200 and a capacitance (C) value of the capacitor unit (not shown). The resonant frequency may be varied according to a change in the inductance (L) value of the inductor unit 1200 and / or a 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-portion 1210h formed therein along the longitudinal direction of the ferrite core 1210.

[0264] The ferrite core 1210 has a through-hole 1210h therein through which the body of the core 1020 passes. The body of the core 1020 can linearly reciprocate 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 curved surface portion 121c curved inward, 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 portion 1231 and a second connecting portion 1232 for connecting to the substrate 2100. The first connecting portion 1231 is disposed on the fixing bracket 1600, and an end of the first connecting portion 1231 is electrically connected to a first terminal portion 2131 of the substrate 2100. The second connecting portion 1232 is disposed on the fixing bracket 1600, and an end of the second connecting portion 1232 is electrically connected to a second terminal portion 2132 of the substrate 2100. Here, the fixing bracket 1600 may have grooves in which the first connecting portion 1231 and the second connecting portion 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 groove can guide the first connecting part 1231 and the second connecting part 1232 of the coil part 1230, and has an advantage that the first connecting part 1231 and the second connecting part 1232 can be protected from external impact.

[0269] FIG. 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 portion of a 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 section 1200 and the board bracket 1900 inside the housing 1010. One end of the fixing bracket 1600 may be connected to the inductor section 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 an outer surface of the other end of the ferrite core 1210 to 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 disposed on the upper side of the fixing bracket 1600 and one may be disposed on the lower side. The locking portion 1960 of the board bracket 1900 may be coupled to the locking hole 1660, thereby coupling the fixing bracket 1600 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 board bracket 1900. By coupling the guide protrusion 1667 to the guide portion 1967 of the board 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 1680. The second partition 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 1680 and the board bracket 1900.

[0277] The fixed bracket 1600 is disposed to surround the moving bracket 1300, the elastic body 1700, and the elastic member 1800. The fixed bracket 1600 may have an internal storage space 1640 in which the moving bracket 1300, the elastic body 1700, and the elastic member 1800 are disposed. In the storage space 1640 of the fixed bracket 1600, the moving bracket 1300 can perform linear reciprocating motion.

[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 both outer surfaces 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 by laser direct structuring (LDS) and laser manufacturing antenna (LMA).

[0279] A groove (or cavity) corresponding to the shape of the electrode pattern 1690 may be formed on the outer surface of the fixing bracket 1600. The electrode pattern 1690 may be plated in the groove (or cavity). Although not shown in a separate drawing, as another embodiment, a protrusion corresponding to the shape of the electrode pattern 1690 may be formed on the outer surface of the fixing bracket 1600, and the electrode pattern 1690 may be plated on the protrusion.

[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 the electrode pattern 1390 of the moving bracket 1300 or may be disposed at a predetermined distance therefrom, 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 disposed at a predetermined distance 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 showing the structure shown in FIG. 35 without inductor section 1200 and fixing bracket 1600, FIG. 40 is a perspective view showing FIG. 39 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 for housing the other end of the core body 1020, the magnetic body 1400, and the protective member 1500.

[0285] Inside the storage section, the magnetic body 1400 and the protective member 1500 are arranged to surround the other end of the core body 1020. For this reason, the magnetic body 1400 may be tubular and have a through-hole therein through which the other end of the core body 1020 penetrates, and the protective member 1500 may be tubular and have a through-hole therein through which the other end of the core body 1020 penetrates.

[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 to the inductor section 1200 fixedly disposed inside the housing 1010. The change in distance changes the inductance of the inductor section 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 protruding 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 from the outer surface of the moving bracket 1300 in an outward direction 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 may 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 may be disposed inside the elastic body 1700. An extension 1870 of the elastic member 1800 may be disposed on an end of the extension 1370.

[0292] The moving bracket 1300 may include an electrode pattern 1390. The electrode pattern 1390 may be disposed on an 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 portion 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 separated from the electrode pattern 1690 of the fixed bracket 1600 by the 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 by 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 an outer surface of the moving bracket 1300 and may be disposed 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 extend from both sides of the first electrode pattern 1391, respectively, and the first extension pattern 1393a may be disposed on the first protrusion 1330a, and the second extension pattern 1393b may be 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 the contact due to the 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, not in 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 is not compressed, and if the external force is larger than the elastic force, the elastic body 1700 begins 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 has the advantage that the internal space of the elastic body 1700 can be utilized and the internal volume of the stylus pen 1000 can be reduced.

[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] In order 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 certain 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 along the longitudinal direction of the stylus pen 1000 on the outer surface of the elastic member 1800. 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 to 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 fixed and mounted to the board bracket 1900 through 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 a mounting portion 1910 for coupling with the elastic member 1800. The mounting portion 1910 protrudes from the board bracket 1900 in a side direction of 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 protruding direction of the mounting portions 1910.

[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 units 2110, 2131, 2132, 2191, and 2192. Of the number of terminal units 2110, 2131, and 2132, the terminal unit 2110 is electrically connected to the elastic body 1700, and the first and second terminal units 2131 and 2132 are electrically connected to the coil unit 1230 of the inductor unit 1200. The third and fourth terminal units 2191 and 2192 are electrically connected to electrode patterns 1690 disposed on both sides of the outer surface of the fixing bracket 1600, respectively.

[0314] The substrate 2100 includes a capacitor unit (not shown). One or a plurality of 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 for explaining the movement of the moving bracket 1300 according to the movement of the core body 1020 shown in FIGS. 35 to 43, and electrical contact and release between the fixed bracket 1600 and the moving bracket 1300. As shown in FIG.

[0317] FIG. 44(A) shows the state when no external force is acting on the core body 1020, and FIG. 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] Next, referring to FIG. 44B, when a predetermined external force acts on the core body 1020 and the core body 1020 moves in one direction, the movable bracket 1300 moves in the one direction in conjunction with the core body 1020. The movement of the movable bracket 1300 in the one direction also causes the second protrusion 1330b to move in the one direction. The movement of the second protrusion 1330b 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. Similarly, the first protrusion 1330a located on the opposite side of the second protrusion 1330b also moves, and the electrode pattern 1390 of the movable bracket 1300 is released from contact with the electrode pattern 1690 of the fixed bracket 1600. The movement of the movable bracket 1300 causes the elastic body 1700 to be compressed.

[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 moving 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. The 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 moving bracket 1300 moves, the magnetic body 1400 disposed inside the moving bracket 1300 also moves. As the magnetic body 1400 moves, the distance between the inductor unit 1200 and the magnetic body 1400 increases. The inductance of the inductor unit (not shown) changes due to the change in the distance between the inductor unit 1200 and the magnetic body 1400. The change in inductance occurs together with the change in capacitance described above. Here, the change in capacitance may be configured to be more predominantly changed by the change in inductance. In a limited space inside the housing of the stylus pen, it is easier to suddenly change the capacitance than to suddenly change the inductance. On the other hand, in some cases, the change in inductance may be configured to be more predominantly changed than the change in capacitance. Alternatively, the change in capacitance and the change in inductance may be configured to have almost the same characteristics. In any of the previous three cases, both the capacitance and inductance change due to the movement of the moving bracket 1300, 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. The change in the resonant frequency is sensed by the receiving side that receives the pen signal, and it can be determined that the stylus pen 1000 has contacted the screen.

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

[0324] 45 and 46 (A) and (B), a number of capacitors C1, C2, C3, and Cs are disposed on a substrate 2100. The number of capacitors C1, C2, C3, and Cs may constitute a capacitor unit (not shown). At least one of the number of capacitors C1, C2, C3, and Cs is connected in parallel to each other to maintain a constant capacitance value, and the auxiliary capacitor Cs is connected in parallel to the base capacitor or is not connected to the base capacitor depending on the contact or release between the electrode pattern 1690 of the fixed bracket 1600 and the electrode pattern 1390 of the moving bracket 1300 shown in FIG.

[0325] 45(A) and 46(A), 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 when no external force is applied to the core body 1020, 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, when a predetermined external force is applied to the core body 1020, the electrode pattern 1390 of the moving bracket 1300 is released from contact with the electrode pattern 1690 of the fixed bracket 1600 due to the movement of the moving bracket 1300 synchronized with the movement of the core body 1020. 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] In particular, referring to Fig. 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 contact each other at two portions. 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, 1393b are disposed on the first and second protrusions 1330a, 1330b of the movable bracket 1300, as shown in Figs. 39 and 40.

[0328] If the external force applied to the core body 1020 is not sufficient 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 has separated from one electrode pattern 1690 of the fixing bracket 1600 but the second extension pattern 1393b has not separated from the remaining other 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 completely separates 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 a hover and a contact can be clearly set, which is advantageous in that the distinction between the hover and the contact can be clearly made. 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 a user's carelessness during the manufacture of the stylus pen, the stylus pen 1000 according to another embodiment of the present invention can maintain a contact state with one electrode pattern different from the other extension pattern, which is advantageous in that the hover state and the contact state can be clearly distinguished.

[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 taken along A-A' of the stylus pen 1000 shown in Figure 47, (B) of Figure 48 is a portion of a cross-sectional view taken along B-B' of the stylus pen 1000 shown in Figure 47, 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] 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 narrows as it goes outward.

[0332] The components disposed inside the housing 1010 also correspond to the shape of the housing 1010 according to the outer 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 outer shape of the housing 1010.

[0333] As shown in Fig. 48A and 48B, the ferrite core 1210 has a first cross-sectional shape cut in a first vertical direction (direction A-A' in Fig. 47) perpendicular to the axial direction x (or the longitudinal direction of the stylus pen 1000) of the ferrite core 1210, which is different from a second cross-sectional shape cut in a second vertical direction (direction B-B' in Fig. 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 tube or cylindrical shape. A flat surface 1210d may be disposed 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 disposed on another portion of the outer surface of the ferrite core 1210. The flat surface 1210d allows the ferrite core 1210 to be stably disposed 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. At least a part of the curved portion 1210c appears in the second cross-sectional shape and does not appear in the first cross-sectional shape, as shown in (A) and (B) of FIG. 48. The curved portion 1210c may be a curved surface that curves toward the through hole 1210h side from one side surface of one end of the ferrite core 1210 to a portion adjacent to the through hole 1210h of the ferrite core 1210. Such curved portions 1210c may be disposed on both sides facing each other at one end of the ferrite core 1210 based on the through hole 1210h.

[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 is aspherical, (1) of Fig. 49 shows that the curved surface portion 1210c is spherical, and (2) of Fig. 49 shows that the curved surface portion 1210c is an intermediate shape between the aspherical shape and the spherical shape.

[0337] At one end of the ferrite core 1210, the flat portion 1210d has a shape in which its width gradually narrows in 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 above-described 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 a receiver side (not shown), which is advantageous in that the magnitude of the pen signal received by the receiver side is increased.

[0339] On the other hand, the ferrite core 1210 shown in Figures 47 to 49 may be applied to the stylus pen shown in Figure 3 or Figure 22. Furthermore, the ferrite core of the stylus pen shown in Figure 3 or Figure 22 may be applied to the stylus pen of Figure 33.

[0340] FIG. 50 is a diagram for explaining a modified example of the ferrite core 1210 shown in FIG. 49, and FIG. 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 FIG. 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 in the direction of the through hole 1210h from one end of the ferrite core 1210' to a portion of the ferrite core 1210' adjacent to the through hole 1210h.

[0343] The ferrite core 1210' has a through hole 1210h penetrating 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 curved portion 1210c' has a gradually decreasing thickness between the outer diameter and the inner diameter 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 gentle.

[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] In the above, the features, structures, effects, etc. described in the 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 having ordinary knowledge in the field to which the embodiment belongs. Therefore, the contents related to such combinations and modifications should be interpreted as being included in the scope of the present invention.

[0349] In addition, although the above description focuses on the embodiment, this is merely an example and does not limit the present invention. A person having ordinary knowledge in the field to which the present invention belongs will understand that various modifications and applications not exemplified above are possible within the scope of the essential characteristics of the present embodiment. For example, each component specifically illustrated in the embodiment can be modified and implemented. The differences related to such modifications and applications should be interpreted as being included in the scope of the present invention defined in the appended claims.

Claims

1. A ferrite core is attached to 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 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 adjacent to the through hole of the ferrite core. 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 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 the curved surface portion changes from an aspherical shape to a spherical shape as it goes from the other end portion of the ferrite core toward the one end portion.

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 such 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 remaining end 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 section including a ferrite core disposed inside the housing and 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 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 adjacent to the through hole of the ferrite core.

6. The stylus pen according to claim 5 , further comprising a magnetic body disposed inside the movable bracket, surrounding the other end of the core body, and interlocking with the movable 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 fixing 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 fixing bracket and attached to the board bracket; an elastic body disposed inside the fixed bracket and between the movable 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 disposed in an empty space of the elastic body. The stylus pen according to claim 8.

10. The fixing bracket includes a pair of electrode patterns disposed on an outer surface thereof so as to face each other, the movable bracket includes an electrode pattern that comes into contact with the pair of electrode patterns 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 into grooves formed on the outer surface of the fixing bracket, The stylus pen of claim 10 , wherein the electrode pattern of the moving bracket is plated into grooves formed in an outer surface of the moving bracket.

13. The stylus pen of claim 8 , wherein movement of the moving bracket synchronized with movement of the core changes the resonant frequency of the resonant circuit.

14. The stylus pen of claim 13 , wherein when the hover state and the touch state of the stylus pen are distinguished, the capacitance of the capacitor unit changes more predominantly than the inductance of the inductor unit.

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 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 toward the one end at the other end of the ferrite core.

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 such that the width of the flat portion gradually narrows toward the one end of the ferrite core.

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