Magnetorheological fluid-based haptic dial using corrugated structure, and control method therefor

Abstract

According to a magnetorheological fluid-based haptic dial using a corrugated structure and a control method therefor of the present invention, a magnetorheological fluid can be used together with a corrugated structure so as to maximize the area of the magnetorheological fluid activated by a magnetic field within the dial, thereby enabling the haptic dial to provide a greater rotational resistance than conventional ones.

Description

Magnetorheological fluid-based haptic dial using a rough structure and its control method

[0001] The present invention relates to a magnetorheological fluid-based haptic dial using a rough structure and a method for controlling the same, and more particularly, to a magnetorheological fluid-based haptic dial using a rough structure that maximizes the area of ​​a magnetorheological fluid activated by a magnetic field within the dial by using the magnetorheological fluid and a rough structure, thereby providing greater rotational resistance than a conventional haptic dial, and a method for controlling the same.

[0002] The content described in this section merely provides background information for one embodiment of the present invention and does not constitute prior art.

[0003]

[0004] In general, an actuator is a mechanical device used to move or control a system. It generally refers to a driving device that utilizes electricity, hydraulics, compressed air, or other sources of power. These actuators operate on energy sources in the form of voltage (current), magnetic fields, hydraulic pressure, or pneumatic pressure, converting this energy into some type of motion.

[0005]

[0006] Recently, many actuators have been developed to provide tactile feedback on the user's body. Most actuators currently under development utilize vibration motors, hydraulic or pneumatic pumps, or other devices (see Patent Application Nos. 10-2001-0057470 and 10-2007-0132361). Specifically, actuators utilize methods such as installing multiple vibration motors in clothing or injecting air into pneumatic bladders to apply pressure to the skin. However, these conventional actuators are bulky and heavy, limiting their usability and space, and limiting their application to specialized and limited fields. In particular, miniaturized and lightweight actuators are required to provide tactile feedback on objects such as fingers. This necessitates the development of a single module that is low-power, compact, and slim, making it applicable to a variety of environments.

[0007]

[0008] Meanwhile, magnetorheological fluids (MR fluids) are liquid magnets that are normally liquid but change viscosity and solidify when exposed to a magnetic field. These characteristics are utilized in various power or control devices. Korean Patent No. 10-1341089 (Rotary actuator using MR fluid) is disclosed as a prior art document. This prior art document comprises a solenoid, a rotating part that freely rotates around a shaft, a housing configured to be cylindrical and meshed with the rotating part, and MR fluids (MR fluids) that are injected into the housing and form magnetic chains along the magnetic flux lines when a magnetic field is generated. Conventional rotary actuators according to this prior art document have a problem in that they provide haptic feedback of rotational resistance in a rotational manner based only on MR fluids, which limits the user's ability to receive haptic feedback of strong rotational resistance.

[0009]

[0010] The background technology described above is technical information that the inventor possessed for the purpose of deriving the present invention or acquired in the process of deriving the present invention, and cannot necessarily be said to be publicly known technology disclosed to the general public prior to the application for the present invention.

[0011] The present invention has been proposed to solve the above-mentioned problems of the existing proposed methods, and the purpose of the present invention is to provide a magnetorheological fluid-based haptic dial using a concave-convex structure, and a control method thereof, including a housing having a cylindrical shape with an upper opening and forming a protruding structure on the inside, a solenoid coil inserted and arranged on the inner periphery of the housing and forming a magnetic field according to an applied voltage, a shaft having a protruding-convex structure formed on the lower part corresponding to the protruding-convex structure of the housing and inserted and arranged corresponding to the protruding-convex structure of the housing to rotate, a magnetorheological fluid positioned between the housing and the protruding-convex structure of the shaft, in which magnetic particles form a magnetic chain by the magnetic field formed by the solenoid coil, a cover having a rotational axis provided on the upper side of the shaft and coupled to the upper end of the housing, and a bearing coupled to the rotational axis of the shaft penetrating the cover and seated and coupled through the upper end of the cover, thereby maximizing the area of ​​the magnetorheological fluid activated by the magnetic field within the dial by utilizing the magnetorheological fluid and the protruding structure, thereby providing a greater rotational resistance than that of existing haptic dials.

[0012]

[0013] In addition, the present invention provides a magnetorheological fluid-based haptic dial using a concavo-convex structure and a control method thereof, which maximizes the area of ​​the magnetorheological fluid activated by the magnetic field within the dial by using the magnetorheological fluid and the concavo-convex structure to provide a rotational resistance greater than that of a conventional haptic dial, thereby allowing the user to feel a greater rotational resistance of the haptic dial, and thereby enables the miniaturization of the haptic dial while still being able to exert a greater force, thereby enabling further improved miniaturization of the product.

[0014]

[0015] However, the technical problems to be solved by the present invention are not limited to the technical problems described above, and other technical problems may exist.

[0016] A magnetorheological fluid-based haptic dial using a rough structure according to the features of the present invention to achieve the above-mentioned purpose is as follows.

[0017] As a magnetorheological fluid-based haptic dial utilizing a rough structure,

[0018] A housing having a cylindrical shape with an upper opening and a recessed structure formed on the inside;

[0019] A solenoid coil inserted into the inner periphery of the housing and forming a magnetic field according to the applied voltage;

[0020] A shaft having a protruding structure corresponding to the protruding structure of the housing formed at the bottom and inserted and rotated corresponding to the protruding structure of the housing;

[0021] A magnetorheological fluid positioned between the housing and the protruding structure of the shaft, wherein magnetic particles form a magnetic chain by a magnetic field formed by the solenoid coil;

[0022] A cover having a rotating shaft provided on the upper side of the shaft and connected to the upper end of the housing; and

[0023] Its structural feature is that it includes a bearing that is connected to the rotation axis of the shaft that penetrates the cover and is seated and combined through the upper part of the cover.

[0024]

[0025] Preferably, the housing comprises:

[0026] A coil mounting portion formed on the inner periphery of the housing so that the solenoid coil that forms a magnetic field according to the applied voltage can be inserted and placed; and

[0027] It can be configured to include a shaft mounting portion having a protruding structure formed inside the coil mounting portion into which the shaft is inserted.

[0028]

[0029] More preferably, the solenoid coil,

[0030] It can be configured as a ring-shaped structure inserted into the coil mounting portion, which is the inner outer surface of the housing, and surrounding the periphery of the assembled protruding structure between the housing and the shaft.

[0031]

[0032] More preferably, the shaft,

[0033] It is composed of a shaft body integrally formed at the lower portion of the above-mentioned rotating shaft, and a protruding structure corresponding to the protruding structure formed at the shaft mounting portion of the above-mentioned housing can be formed at the lower portion of the shaft body.

[0034]

[0035] Even more preferably, the shaft,

[0036] A recessed structure corresponding to the recessed structure formed in the shaft mounting portion of the housing is formed at the lower portion of the shaft body, and the recessed structure may be configured in any one of a screw-shaped triangle shape, a semicircular shape, and a trapezoidal shape.

[0037]

[0038] According to one embodiment of the present invention, a method for controlling a magnetorheological fluid-based haptic dial using a rough structure to achieve the above-described purpose is provided.

[0039] A method for controlling a magnetorheological fluid-based haptic dial using a rough structure,

[0040] (1) A haptic dial based on a magnetorheological fluid using a concave-convex structure, comprising a housing having a cylindrical shape with an upper opening and forming a concave-convex structure on the inside, a solenoid coil inserted and arranged on the inner periphery of the housing and forming a magnetic field according to an applied voltage, a shaft having a concave-convex structure formed on the lower portion corresponding to the concave-convex structure of the housing and inserted and arranged corresponding to the concave-convex structure of the housing to rotate, a magnetorheological fluid located between the housing and the concave-convex structure of the shaft and having magnetic particles forming a magnetic chain by the magnetic field formed by the solenoid coil, a cover having a rotational axis provided on the upper side of the shaft and coupled to the upper end of the housing, and a bearing coupled to the rotational axis of the shaft penetrating the cover and seated and coupled through the upper end of the cover, wherein the step of generating a magnetic field according to an applied voltage by the solenoid coil is provided;

[0041] (2) A step in which magnetic particles in the fluid form a magnetic chain by the magnetic field as the magnetic field generated by the solenoid coil of step (1) is applied to the magnetorheological fluid; and

[0042] (3) It is characterized in that it includes a step of providing a user with rotational resistance as the shaft rotates in a state where the viscosity of the magnetorheological fluid is increased by a magnetic chain formed by the magnetorheological fluid of the above step (2).

[0043]

[0044] Preferably, the housing comprises:

[0045] A coil mounting portion formed on the inner periphery of the housing so that the solenoid coil that forms a magnetic field according to the applied voltage can be inserted and placed; and

[0046] It can be configured to include a shaft mounting portion having a protruding structure formed inside the coil mounting portion into which the shaft is inserted.

[0047]

[0048] More preferably, the solenoid coil,

[0049] It can be configured as a ring-shaped structure inserted into the coil mounting portion, which is the inner outer surface of the housing, and surrounding the periphery of the assembled protruding structure between the housing and the shaft.

[0050]

[0051] More preferably, the shaft,

[0052] It is composed of a shaft body integrally formed at the lower portion of the above-mentioned rotating shaft, and a protruding structure corresponding to the protruding structure formed at the shaft mounting portion of the above-mentioned housing can be formed at the lower portion of the shaft body.

[0053]

[0054] Even more preferably, the shaft,

[0055] A recessed structure corresponding to the recessed structure formed in the shaft mounting portion of the housing is formed at the lower portion of the shaft body, and the recessed structure may be configured in any one of a screw-shaped triangle shape, a semicircular shape, and a trapezoidal shape.

[0056] According to the magnetorheological fluid-based haptic dial using a protruding structure proposed in the present invention and its control method, the haptic dial comprises a housing having a cylindrical shape with an upper opening and forming a protruding structure on the inside, a solenoid coil inserted and arranged on the inner periphery of the housing and forming a magnetic field according to an applied voltage, a shaft having a protruding structure corresponding to the protruding structure of the housing formed on the lower part and inserted and arranged corresponding to the protruding structure of the housing to rotate, a magnetorheological fluid positioned between the housing and the protruding structure of the shaft and having magnetic particles forming a magnetic chain by the magnetic field formed by the solenoid coil, a cover having a rotational axis provided on the upper side of the shaft and coupled to the upper end of the housing, and a bearing coupled to the rotational axis of the shaft penetrating the cover and seated and coupled through the upper end of the cover, thereby maximizing the area of ​​the magnetorheological fluid activated by the magnetic field within the dial using the magnetorheological fluid and the protruding structure, thereby providing a greater rotational resistance than that of a conventional haptic dial.

[0057]

[0058] In addition, according to the magnetorheological fluid-based haptic dial using the uneven structure of the present invention and the control method thereof, the magnetorheological fluid and the uneven structure are used to maximize the area of ​​the magnetorheological fluid activated by the magnetic field within the dial, thereby providing a greater rotational resistance than the existing haptic dial, so that the user can feel the rotational resistance of the haptic dial to a greater extent, and thus the haptic dial can be made smaller while still being able to exert greater force, and further improved product miniaturization can be achieved.

[0059]

[0060] In addition, the various advantageous advantages and effects of the present invention are not limited to the above-described contents, and will be more easily understood in the process of explaining specific embodiments of the present invention.

[0061] FIG. 1 is a drawing illustrating the configuration of a magnetorheological fluid-based haptic dial using a rough structure according to one embodiment of the present invention as a functional block.

[0062] FIG. 2 is a drawing illustrating the configuration of a housing of a magnetorheological fluid-based haptic dial using a rough structure according to an embodiment of the present invention as a functional block.

[0063] FIG. 3 is a drawing illustrating the configuration of a shaft of a magnetorheological fluid-based haptic dial using a rough structure according to an embodiment of the present invention as a functional block.

[0064] FIG. 4 is a diagram illustrating the configuration of a magnetorheological fluid of a haptic dial based on a magnetorheological fluid using a rough structure according to an embodiment of the present invention as a functional block.

[0065] FIG. 5 is a drawing showing the arrangement configuration of a shaft, magnetorheological fluid, and housing of a magnetorheological fluid-based haptic dial using a rough structure according to one embodiment of the present invention.

[0066] FIG. 6 is a schematic exploded perspective view of a haptic dial based on a magnetorheological fluid using a rough structure according to an embodiment of the present invention.

[0067] FIG. 7 is a drawing illustrating an assembled perspective view configuration of a magnetorheological fluid-based haptic dial using a rough structure according to one embodiment of the present invention.

[0068] FIG. 8 is a diagram illustrating a cross-sectional configuration of a magnetorheological fluid-based haptic dial using a rough structure according to one embodiment of the present invention.

[0069] FIG. 9 is a drawing illustrating the configuration of the initial state of the magnetorheological fluid between the housing and the shaft of a magnetorheological fluid-based haptic dial using a rough structure according to one embodiment of the present invention.

[0070] FIG. 10 is a diagram illustrating a configuration of a magnetic field application state of a magnetorheological fluid between a housing and a shaft of a magnetorheological fluid-based haptic dial using a rough structure according to one embodiment of the present invention.

[0071] FIG. 11 is a diagram illustrating an exploded perspective view of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to one embodiment of the present invention, to which a semicircular protruding structure is applied.

[0072] FIG. 12 is a diagram illustrating a cross-sectional configuration of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to one embodiment of the present invention, to which a semicircular protruding structure is applied.

[0073] FIG. 13 is a diagram illustrating an exploded perspective view of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to one embodiment of the present invention, to which a trapezoidal protruding structure is applied.

[0074] FIG. 14 is a diagram illustrating a cross-sectional configuration of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to one embodiment of the present invention, to which a trapezoidal protruding structure is applied.

[0075] FIG. 15 is a diagram illustrating a flow chart of a method for controlling a magnetorheological fluid-based haptic dial using a rough structure according to an embodiment of the present invention.

[0076] <Explanation of symbols>

[0077] 100: Magnetorheological fluid-based haptic dial according to one embodiment of the present invention

[0078] 110: Housing

[0079] 111: Coil mounting part

[0080] 112: Shaft mounting part

[0081] 120: Solenoid coil

[0082] 130: Shaft

[0083] 131: Rotation axis

[0084] 132: Shaft body

[0085] 140: Magnetorheological fluid

[0086] 141: Magnetic particles

[0087] 150: Cover

[0088] 160: Bearing

[0089] S110: In a magnetorheological fluid-based haptic dial using a rough structure, a step of generating a magnetic field according to an applied voltage to a solenoid coil

[0090] S120: A step in which magnetic particles in a magnetorheological fluid form a magnetic chain by a magnetic field generated by a solenoid coil as the magnetic field is applied.

[0091] S130: A step for providing the user with rotational resistance as the shaft rotates in a state where the viscosity of the magnetorheological fluid is increased by a magnetic chain formed by the magnetorheological fluid.

[0092] Below, with reference to the attached drawings, embodiments of the present invention are described in detail so that those skilled in the art can easily implement them. However, the present invention may be implemented in various different forms and is not limited to the embodiments described herein. In the drawings, irrelevant parts have been omitted for clarity of description, and similar reference numerals have been used throughout the specification to indicate similar elements.

[0093]

[0094] Throughout the specification, when a part is said to be "connected" to another part, this includes not only the case where it is "directly connected" but also the case where it is "indirectly connected" with another element in between. Furthermore, when a part is said to "include" a component, this should be understood to mean that, unless specifically stated to the contrary, it may include other components rather than excluding them, and does not preclude the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0095]

[0096] The following examples are provided as detailed explanations to aid understanding of the present invention and do not limit the scope of the invention. Therefore, inventions with the same functions and scope as the present invention are also within the scope of the present invention.

[0097]

[0098] In addition, each configuration, process, procedure or method included in each embodiment of the present invention may be shared within a scope that is not technically inconsistent with each other.

[0099]

[0100] FIG. 1 is a diagram illustrating the configuration of a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention as a functional block, FIG. 2 is a diagram illustrating the configuration of a housing of a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention as a functional block, FIG. 3 is a diagram illustrating the configuration of a shaft of a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention as a functional block, FIG. 4 is a diagram illustrating the configuration of a magnetorheological fluid of a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention as a functional block, and FIG. 5 is a diagram illustrating the arrangement configuration of a shaft, a magnetorheological fluid, and a housing of a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention. As illustrated in FIGS. 1 to 5, a magnetorheological fluid-based haptic dial (100) using a protruding structure according to an embodiment of the present invention comprises: a housing (110) having a cylindrical shape with an upper opening and forming a protruding structure on the inside; a solenoid coil (120) inserted and arranged on the inner periphery of the housing (110) and forming a magnetic field according to an applied voltage; a shaft (130) having a protruding structure corresponding to the protruding structure of the housing (110) formed on the lower portion and inserted and arranged corresponding to the protruding structure of the housing (110) and rotating; a magnetorheological fluid (140) positioned between the protruding structure of the housing (110) and the shaft (130) and having magnetic particles (141) forming a magnetic chain by the magnetic field formed by the solenoid coil (120); a cover (150) through which a rotational axis (131) provided on the upper side of the shaft (130) penetrates and is coupled to the upper end of the housing (110); and It can be configured to include a bearing (160) that is connected to the rotation axis (131) of the shaft (130) that penetrates the cover (150) and is seated and combined through the upper part of the cover (150).Hereinafter, with reference to the attached drawings, a detailed description will be given of a specific configuration of a magnetorheological fluid-based haptic dial using a rough structure according to an embodiment of the present invention.

[0101]

[0102] FIG. 6 is a schematic exploded perspective view of a haptic dial based on a magnetorheological fluid using a protruding structure according to an embodiment of the present invention, FIG. 7 is a view showing an assembled perspective view of a haptic dial based on a magnetorheological fluid using a protruding structure according to an embodiment of the present invention, FIG. 8 is a cross-sectional view of a haptic dial based on a magnetorheological fluid using a protruding structure according to an embodiment of the present invention, FIG. 9 is a view showing an initial state of a magnetorheological fluid between a housing and a shaft of a haptic dial based on a magnetorheological fluid using a protruding structure according to an embodiment of the present invention, and FIG. 10 is a view showing a state of a magnetic field application of a magnetorheological fluid between a housing and a shaft of a haptic dial based on a magnetorheological fluid using a protruding structure according to an embodiment of the present invention.

[0103]

[0104] FIG. 11 is a diagram showing an exploded perspective view configuration of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, to which a semicircular protruding structure is applied, FIG. 12 is a diagram showing a cross-sectional view configuration of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, to which a semicircular protruding structure is applied, FIG. 13 is a diagram showing an exploded perspective view configuration of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, to which a trapezoidal protruding structure is applied, and FIG. 14 is a diagram showing a cross-sectional view configuration of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, to which a trapezoidal protruding structure is applied.

[0105]

[0106] The housing (110) is formed in a cylindrical shape with an upper opening and is configured to form a protruding structure on the inside. As illustrated in FIGS. 2, 6, 11, and 13, the housing (110) may include a coil mounting portion (111) formed on the inner periphery of the housing (110) so that a solenoid coil (120) that forms a magnetic field according to an applied voltage can be inserted and placed, and a shaft mounting portion (112) having a protruding structure formed on the inside of the coil mounting portion (111) so that a shaft (130) can be inserted and placed. Here, the housing (110) may be configured in a structure in which the coil mounting portion (111) and the shaft mounting portion (112) are divided into an outer and an inner compartment.

[0107]

[0108] In addition, the shaft mounting portion (112) formed on the inner surface of the housing (110) may have a triangular screw-like structure formed as shown in FIG. 8, or a semicircular structure formed as shown in FIG. 12, or a trapezoidal structure formed as shown in FIG. 14. That is, the triangular structure of the housing (110) may be understood to be configured as any one of a triangular screw-like shape, a semicircular shape, and a trapezoidal shape.

[0109]

[0110] The solenoid coil (120) is inserted and placed on the inner periphery of the housing (110) and is configured to form a magnetic field according to the applied voltage. This solenoid coil (120) has a ring-shaped structure inserted and placed on the coil mounting portion (111) which is the inner periphery of the housing (110), and can be configured in a form that surrounds the periphery of the assembled protruding structure between the housing (110) and the shaft (130). Here, the solenoid coil (120) serves to apply a magnetic field to the magnetorheological fluid (140) so that the user can feel haptic feedback through strong rotational resistance when the shaft (130) rotates.

[0111]

[0112] The shaft (130) is configured to have a protruding structure corresponding to the protruding structure of the housing (110) formed at the lower portion thereof, and is inserted and positioned to correspond to the protruding structure of the housing (110) and rotate. This shaft (130) is configured with a shaft body (132) integrally formed at the lower portion of a rotational shaft (131), and a protruding structure corresponding to the protruding structure formed at the shaft mounting portion (112) of the housing (110) may be formed at the lower portion of the shaft body (132). Here, the shaft (130) forms a protruding structure corresponding to the protruding structure formed at the shaft mounting portion (112) of the housing (110) at the lower portion of the shaft body (132), and the protruding structure may be configured in any one of a triangular shape, a semicircular shape, and a trapezoidal shape in the form of a screw thread.

[0113]

[0114] In addition, the shaft (130) is composed of a rotation axis (131) that can be held and rotated by a user and a shaft body (132), and can be assembled with the shaft mounting portion (112) of the housing (110) with a magnetorheological fluid (140) therebetween through a protruding structure formed at the lower portion of the shaft body (132). This shaft (130) functions so that when a user holds the rotation axis (131) and rotates it, in the initial state where no magnetic field is formed in the solenoid coil (120), the magnetorheological fluid (140) acts like a lubricant so that the user can easily rotate it, and when a magnetic field is generated in the solenoid coil (120) and a magnetic field is applied to the magnetorheological fluid (140), the magnetic particles (141) in the magnetorheological fluid (140) form a magnetic chain due to the magnetic field, increasing the viscosity of the magnetorheological fluid (140), so that the user who rotates the rotation axis (131) of the shaft (130) can feel a strong rotational resistance. At this time, the area of ​​the magnetorheological fluid (140) activated by the magnetic field is maximized due to the uneven structure, so that a greater rotational resistance can be felt than before.

[0115]

[0116] The magnetorheological fluid (140) is positioned between the housing (110) and the protruding structure of the shaft (130), and is configured such that the magnetic particles (141) form a magnetic chain by the magnetic field formed by the solenoid coil (120). This magnetorheological fluid (140) can be injected and filled into the assembly gap between the shaft mounting portion (112) of the housing (110) and the protruding structure formed at the bottom of the shaft (130). Here, the magnetorheological fluid (140) can be composed of silicone oil and fine magnetic particles (141), and in the initial state when no magnetic field is applied, the magnetic particles (141) float freely in the oil and exist as a viscous liquid, and when a magnetic field is applied, the magnetic particles (141) are arranged along the magnetic flux lines to form a magnetic chain, thereby changing to a state in which the viscosity increases. That is, the magnetorheological fluid (140) has a characteristic in which the viscosity increases when a magnetic field is applied.

[0117]

[0118] The cover (150) is configured such that the rotation axis (131) provided on the upper side of the shaft (130) passes through it and is coupled to the upper end of the housing (110). This cover (150) is a structure that is fastened to the upper end of the housing (110) and can function to prevent leakage of the magnetorheological fluid (140). Here, the cover (150) can be coupled to a bearing (160) that will be described later.

[0119]

[0120] In addition, the cover (150) may be configured in a plate shape having a hole through which the rotation axis (131) of the shaft (130) passes, and a bearing coupling groove (not shown) formed on the upper surface in which a bearing (160) is fixedly coupled may be formed.

[0121]

[0122] The bearing (160) is configured to be connected to the rotation axis (131) of the shaft (130) that penetrates the cover (150) and is seated and coupled through the upper part of the cover (150). This bearing (160) can be seated and coupled in a bearing coupling groove formed on the upper surface of the cover (150).

[0123]

[0124] In this way, a housing (110) having a cylindrical shape with an upper opening and forming a protruding structure on the inside, and a solenoid coil (120) inserted and placed on the inner outer surface of the housing (110) and forming a magnetic field according to the applied voltage. A magnetorheological fluid-based haptic dial (100) using a concave-convex structure, which includes a shaft (130) that is inserted and rotates in correspondence to the concave-convex structure of the housing (110), a magnetorheological fluid (140) positioned between the concave-convex structure of the housing (110) and the housing (110) and in which magnetic particles (141) form a magnetic chain by a magnetic field formed by a solenoid coil (120), a cover (150) that is coupled to the upper end of the housing (110) through which the rotational axis (131) provided on the upper side of the shaft (130) passes, and a bearing (160) that is engaged with the rotational axis (131) of the shaft (130) that passes through the cover (150) and is seated and coupled through the upper end of the cover (150), is formed by using the magnetorheological fluid (140) and the concave-convex structure to activate the magnetorheological fluid (140) that is activated by a magnetic field in the dial. It can function to provide a rotational resistance greater than that of the existing haptic dial by maximizing the area. That is, the magnetorheological fluid-based haptic dial (100) using a protruding structure can function to feel a rotational resistance greater than that of the existing one by maximizing the area of ​​the magnetorheological fluid (140) where the magnetic field is activated due to the protruding structure when a magnetic field is applied by using the protruding structure formed on the shaft (130) and the housing (110) and the structure of the magnetorheological fluid (140) located between the protruding structure of the shaft (130) and the housing (110).

[0125]

[0126] FIG. 6 shows a schematic exploded perspective view of a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, FIG. 7 shows an assembled perspective view of a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, FIG. 8 shows a cross-sectional view of a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, FIG. 9 shows an initial state of a magnetorheological fluid between a housing and a shaft of a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, and FIG. 10 shows a magnetic field application state of a magnetorheological fluid between a housing and a shaft of a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention. As illustrated in FIGS. 6 to 10, the magnetorheological fluid-based haptic dial (100) using a protruding structure according to an embodiment of the present invention has a triangular structure in the shape of a screw thread, and when voltage is applied to the solenoid coil (120), a magnetic field is formed and the magnetorheological fluid (140) is activated, and accordingly, the area of ​​the magnetorheological fluid (140) activated by the magnetic field at the lower end of the shaft (130) and the protruding structure of the shaft mounting portion (112) of the housing (110) is maximized, thereby forming a greater rotational resistance.

[0127]

[0128] FIG. 11 is an exploded perspective view of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, wherein a semicircular protruding structure is applied, FIG. 12 is a cross-sectional view of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, wherein a semicircular protruding structure is applied, FIG. 13 is an exploded perspective view of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, wherein a trapezoidal protruding structure is applied, and FIG. 14 is a cross-sectional view of a haptic dial using a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention, wherein a trapezoidal protruding structure is applied. As shown in FIGS. 11 to 14, the haptic dial (100) to which a semicircular protrusion structure and a trapezoidal protrusion structure are applied can be understood to exhibit the same or similar operational effect as the haptic dial (100) shown in FIGS. 6 to 10, with only a difference in the shape of the protrusion structure.

[0129]

[0130] FIG. 15 is a diagram illustrating a flowchart of a method for controlling a haptic dial based on a magnetorheological fluid using a protruding structure according to an embodiment of the present invention. As illustrated in FIG. 15, the method for controlling a haptic dial based on a magnetorheological fluid using a protruding structure according to an embodiment of the present invention can be implemented by including a step (S110) of generating a magnetic field according to a voltage applied to a solenoid coil in a magnetorheological fluid-based haptic dial using a protruding structure, a step (S120) of forming a magnetic chain by a magnetic field of magnetic particles in the fluid as the magnetorheological fluid is applied with a magnetic field generated by the solenoid coil, and a step (S130) of providing a rotational resistance to a user as a shaft rotates in a state where the viscosity of the magnetorheological fluid is increased by the magnetic chain formed by the magnetorheological fluid.

[0131]

[0132] In step S110, a housing (110) having a cylindrical shape with an upper opening and forming a protruding structure on the inside, a solenoid coil (120) inserted and placed on the inner outer surface of the housing (110) and forming a magnetic field according to an applied voltage, a shaft (130) having a protruding structure corresponding to the protruding structure of the housing (110) formed on the lower side and inserted and placed corresponding to the protruding structure of the housing (110) and rotating, a magnetorheological fluid (140) located between the protruding structure of the housing (110) and the shaft (130) and having magnetic particles (141) forming a magnetic chain by the magnetic field formed in the solenoid coil (120), a cover (150) which is connected to the upper end of the housing (110) by the rotational axis (131) provided on the upper side of the shaft (130), and the rotational axis (131) of the shaft (130) penetrating the cover (150) and being connected to the rotational axis (131) of the shaft (130) penetrating the cover (150) and passing through the upper end of the cover (150). In a magnetorheological fluid-based haptic dial (100) using a protruding structure including a bearing (160) that is fixedly coupled, a solenoid coil (120) generates a magnetic field according to the applied voltage. In step S110, the housing (110) may be configured to include a coil mounting portion (111) formed on the inner periphery of the housing (110) so that a solenoid coil (120) that forms a magnetic field according to the applied voltage can be inserted and placed, as illustrated in FIGS. 2, 6, 11, and 13, respectively, and a shaft mounting portion (112) having a protruding structure formed inside the coil mounting portion (111) so that a shaft (130) is inserted and placed. Here, the housing (110) may be configured to have a structure in which the coil mounting portion (111) and the shaft mounting portion (112) are partitioned into an outer and an inner compartment.

[0133]

[0134] In addition, the shaft mounting portion (112) formed on the inner surface of the housing (110) may have a triangular screw-like structure formed as shown in FIG. 8, or a semicircular structure formed as shown in FIG. 12, or a trapezoidal structure formed as shown in FIG. 14. That is, the triangular structure of the housing (110) may be understood to be configured as any one of a triangular screw-like shape, a semicircular shape, and a trapezoidal shape.

[0135]

[0136] In addition, the solenoid coil (120) in step S110 may be configured as a ring-shaped structure inserted into the coil mounting portion (111), which is the inner outer surface of the housing (110), and may be configured in a form that surrounds the periphery of the assembled protruding structure between the housing (110) and the shaft (130). Here, the solenoid coil (120) serves to apply a magnetic field to the magnetorheological fluid (140) so that the user can feel haptic feedback through strong rotational resistance when the shaft (130) rotates.

[0137]

[0138] In addition, the cover (150) in step S110 can be a structure that is fastened to the upper end of the housing (110) and can function to prevent leakage of the magnetorheological fluid (140). Here, the cover (150) can be combined with a bearing (160) to be described later. In addition, the cover (150) can be configured in a structure in which a plate shape having a through hole through which the rotation axis (131) of the shaft (130) passes is formed, and a bearing coupling groove (not shown) in which the bearing (160) is fixedly coupled is formed on the upper surface.

[0139]

[0140] Additionally, the bearing (160) in step S110 can be seated and coupled in a bearing coupling groove formed on the upper surface of the cover (150).

[0141]

[0142] In step S120, the magnetorheological fluid (140) forms a magnetic chain due to the magnetic field generated by the solenoid coil (120) in step S110, as the magnetic field is applied. The magnetorheological fluid (140) in step S120 may be injected and filled into the assembly gap between the shaft mounting portion (112) of the housing (110) and the protruding structure formed at the bottom of the shaft (130). Here, the magnetorheological fluid (140) may be composed of silicone oil and fine magnetic particles (141), and in the initial state when no magnetic field is applied, the magnetic particles (141) float freely in the oil and exist as a viscous liquid, and when a magnetic field is applied, the magnetic particles (141) are arranged along the magnetic flux lines to form a magnetic chain, thereby changing to a state in which the viscosity increases. That is, the magnetorheological fluid (140) has a characteristic in which the viscosity increases when a magnetic field is applied.

[0143]

[0144] In step S130, the shaft (130) is formed by the magnetorheological fluid (140) of step S120, and provides the user with rotational resistance as the shaft rotates in a state where the viscosity of the magnetorheological fluid (140) is increased. In step S130, the shaft (130) has a protruding structure formed at the lower portion corresponding to the protruding structure of the housing (110), and is configured to be inserted and rotated corresponding to the protruding structure of the housing (110). Here, the shaft (130) is formed by a shaft body (132) integrally formed at the lower portion of the rotation axis (131), and a protruding structure corresponding to the protruding structure formed at the shaft mounting portion (112) of the housing (110) may be formed at the lower portion of the shaft body (132). At this time, the shaft (130) forms a protruding structure corresponding to the protruding structure formed in the shaft mounting portion (112) of the housing (110) at the lower portion of the shaft body (132), and the protruding structure may be configured in any one of a screw-shaped triangle shape, a semicircular shape, and a trapezoidal shape.

[0145]

[0146] In addition, the shaft (130) is composed of a rotation axis (131) that can be held and rotated by a user and a shaft body (132), and can be assembled with the shaft mounting portion (112) of the housing (110) with a magnetorheological fluid (140) therebetween through a protruding structure formed at the lower portion of the shaft body (132). This shaft (130) functions so that when a user holds the rotation axis (131) and rotates it, in the initial state where no magnetic field is formed in the solenoid coil (120), the magnetorheological fluid (140) acts like a lubricant so that the user can easily rotate it, and when a magnetic field is generated in the solenoid coil (120) and a magnetic field is applied to the magnetorheological fluid (140), the magnetic particles (141) in the magnetorheological fluid (140) form a magnetic chain due to the magnetic field, increasing the viscosity of the magnetorheological fluid (140), so that the user who rotates the rotation axis (131) of the shaft (130) can feel a strong rotational resistance. At this time, the area of ​​the magnetorheological fluid (140) activated by the magnetic field is maximized due to the uneven structure, so that a greater rotational resistance can be felt than before.

[0147]

[0148] As described above, a magnetorheological fluid-based haptic dial using a protruding structure according to an embodiment of the present invention and a control method thereof include a housing having a cylindrical shape with an upper opening and forming a protruding structure on the inside, a solenoid coil inserted and arranged on the inner periphery of the housing and forming a magnetic field according to an applied voltage, a shaft having a protruding structure corresponding to the protruding structure of the housing formed on the lower side and inserted and arranged corresponding to the protruding structure of the housing to rotate, a magnetorheological fluid positioned between the housing and the protruding structure of the shaft and having magnetic particles forming a magnetic chain by the magnetic field formed by the solenoid coil, a cover having a rotational axis provided on the upper side of the shaft and coupled to the upper end of the housing, and a bearing coupled to the rotational axis of the shaft penetrating the cover and seated and coupled through the upper end of the cover, thereby maximizing an area of ​​the magnetorheological fluid activated by a magnetic field within the dial by using the magnetorheological fluid and the protruding structure, thereby providing a greater rotational resistance than that of a conventional haptic dial, and in particular, the magnetorheological fluid and the protruding structure By maximizing the area of ​​the magnetorheological fluid activated by the magnetic field within the dial using the structure, the rotational resistance of the haptic dial can be greatly felt by the user, thereby enabling the haptic dial to be miniaturized while still being able to exert great force, and enabling further miniaturization of the product.

[0149]

[0150] The foregoing description of the present invention is for illustrative purposes only, and those skilled in the art will readily appreciate that the present invention can be readily modified into other specific forms without altering the technical spirit or essential characteristics of the present invention. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive. For example, each component described as a single entity may be implemented in a distributed manner, and similarly, components described as distributed may be implemented in a combined manner.

[0151]

[0152] The scope of the present invention is indicated by the claims described below rather than the detailed description above, and all changes or modifications derived from the meaning and scope of the claims and their equivalent concepts should be interpreted as being included in the scope of the present invention.

Claims

1. A magnetorheological fluid-based haptic dial (100) using a rough structure, A housing (110) having a cylindrical shape with an upper opening and forming a protruding structure on the inside; A solenoid coil (120) inserted and placed on the inner outer surface of the housing (110) and forming a magnetic field according to the applied voltage; A shaft (130) having a protruding structure corresponding to the protruding structure of the housing (110) formed at the bottom and inserted and rotated corresponding to the protruding structure of the housing (110); A magnetorheological fluid (140) positioned between the protruding structure of the housing (110) and the shaft (130), in which magnetic particles (141) form a magnetic chain by a magnetic field formed in the solenoid coil (120); A cover (150) that is connected to the upper part of the housing (110) and through which a rotation shaft (131) is provided on the upper side of the shaft (130); and A magnetorheological fluid-based haptic dial using a rough structure, characterized in that it includes a bearing (160) that is connected to a rotation axis (131) of a shaft (130) that penetrates the cover (150) and is seated and coupled through the upper part of the cover (150).

2. In the first paragraph, the housing (110) A coil mounting portion (111) formed on the inner outer surface of the housing (110) so that the solenoid coil (120) that forms a magnetic field according to the applied voltage can be inserted and placed; and A magnetorheological fluid-based haptic dial using a protruding structure, characterized in that it comprises a shaft mounting portion (112) having a protruding structure formed inside the coil mounting portion (111) into which the shaft (130) is inserted and positioned.

3. In the second paragraph, the solenoid coil (120) It is a circular structure inserted into the coil mounting portion (111), which is the inner outer surface of the housing (110), and is configured in a form that surrounds the periphery of the assembled protruding structure between the housing (110) and the shaft (130). The above shaft (130) is It is composed of a shaft body (132) integrally formed at the lower portion of the above-mentioned rotation shaft (131), and a protruding structure corresponding to the protruding structure formed at the shaft mounting portion (112) of the above-mentioned housing (110) is formed at the lower portion of the shaft body (132). A magnetorheological fluid-based haptic dial using a protruding structure, characterized in that a protruding structure corresponding to the protruding structure formed in the shaft mounting portion (112) of the housing (110) is formed at the lower portion of the shaft body (132), and the protruding structure is configured in any one of a screw-shaped triangle shape, a semicircular shape, and a trapezoidal shape.

4. A method for controlling a magnetorheological fluid-based haptic dial (100) using a rough structure, (1) A housing (110) having a cylindrical shape with an upper opening and forming a protruding structure on the inside, a solenoid coil (120) inserted and arranged on the inner outer surface of the housing (110) and forming a magnetic field according to the applied voltage, a shaft (130) having a protruding structure corresponding to the protruding structure of the housing (110) formed on the lower portion and inserted and arranged corresponding to the protruding structure of the housing (110) and rotating, a magnetorheological fluid (140) positioned between the protruding structure of the housing (110) and the shaft (130) and having magnetic particles (141) forming a magnetic chain by the magnetic field formed in the solenoid coil (120), a cover (150) which is connected to the upper end of the housing (110) and the rotational axis (131) of the shaft (130) penetrating the cover (150) and is fastened to the rotational axis (131) of the shaft (130) penetrating the cover (150). In a magnetorheological fluid-based haptic dial (100) using a protruding structure including a bearing (160) that is mounted and coupled through the upper part of a cover (150), a step of generating a magnetic field according to an applied voltage by a solenoid coil (120); (2) A step in which magnetic particles in the fluid form a magnetic chain by the magnetic field as the magnetic field generated by the solenoid coil (120) of the above step (1) is applied to the magnetorheological fluid (140); and (3) A method for controlling a magnetorheological fluid-based haptic dial using a rough structure, characterized in that it includes a step of providing a rotational resistance force to a user as the shaft (130) rotates in a state where the viscosity of the magnetorheological fluid (140) is increased by a magnetic chain formed by the magnetorheological fluid (140) of the above step (2).

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