WO2016208455A1 - 入力装置及び入力装置の制御方法 - Google Patents
入力装置及び入力装置の制御方法 Download PDFInfo
- Publication number
- WO2016208455A1 WO2016208455A1 PCT/JP2016/067656 JP2016067656W WO2016208455A1 WO 2016208455 A1 WO2016208455 A1 WO 2016208455A1 JP 2016067656 W JP2016067656 W JP 2016067656W WO 2016208455 A1 WO2016208455 A1 WO 2016208455A1
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- WIPO (PCT)
- Prior art keywords
- magnetic field
- input device
- fixed
- yoke
- magnetorheological fluid
- Prior art date
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
- H01H36/008—Change of magnetic field wherein the magnet and switch are fixed, e.g. by shielding or relative movements of armature
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G1/00—Controlling members, e.g. knobs or handles; Assemblies or arrangements thereof; Indicating position of controlling members
- G05G1/08—Controlling members for hand actuation by rotary movement, e.g. hand wheels
- G05G1/10—Details, e.g. of discs, knobs, wheels or handles
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05G—CONTROL DEVICES OR SYSTEMS INSOFAR AS CHARACTERISED BY MECHANICAL FEATURES ONLY
- G05G5/00—Means for preventing, limiting or returning the movements of parts of a control mechanism, e.g. locking controlling member
- G05G5/03—Means for enhancing the operator's awareness of arrival of the controlling member at a command or datum position; Providing feel, e.g. means for creating a counterforce
Definitions
- the present invention relates to an input device and a control method of the input device.
- the input device of Patent Document 1 produces an operation feeling by using a motor to generate a torque in the direction opposite to the operation direction.
- the input device of Patent Document 2 produces an operation feeling by changing the friction between solids by the attraction of solid magnetic materials.
- Patent document 1 JP 2003-050639 JP-A-2015-008593
- Patent Document 1 using a motor as in Patent Document 1 has a disadvantage that the device becomes large.
- the use of frictional force as in Patent Document 2 has a disadvantage that contact noise is generated when the solids are brought into contact from a non-contact state.
- the present invention has been made in view of the above circumstances, and an object thereof is to provide an input device and a control method of the input device which produce a small and quiet operation feeling.
- the present invention exists in at least a part of the gap between the first member and the second member, which move relatively in response to the input operation, and the first member and the second member, and responds to the magnetic field. It is an input device provided with a magnetorheological fluid whose viscosity changes and a magnetic field generation unit that generates a magnetic field acting on the magnetorheological fluid.
- the magnetic field generator generates a magnetic field having a component perpendicular to the relative movement direction of the first member and the second member.
- the resistance can be controlled in the relative moving direction of the first member and the second member.
- the second member is rotated relative to the first member, and the first member is rotated in a direction along the central axis of rotation of the first member and the second member.
- the magnetorheological fluid is present in at least a portion of the gap formed between the second member and the second member.
- the resistance can be controlled at a portion where the first member and the second member face in the direction along the central axis.
- the second member is rotated relative to the first member, and the second member is rotated in a direction perpendicular to the central axis of rotation of the first member and the second member.
- the magnetorheological fluid is present in at least a part of the gap formed between the one member and the second member.
- the resistance can be controlled at a portion where the first member and the second member face in the direction orthogonal to the central axis.
- the input device of the present invention further includes a control unit that controls the magnetic field generation unit to change the magnetic field
- one of the first member and the second member includes a cam portion having a predetermined shape.
- the other of the first member and the second member includes an abutment member and an elastic member resiliently urging the abutment member toward the cam portion, the abutment moving according to a predetermined shape
- the control unit controls the magnetic field generation unit to change the magnetic field so as to suppress the vibration of the member.
- the input device comprises a detection unit for detecting at least one of relative position, velocity and acceleration of the first member and the second member, and relative control by controlling the magnetic field generation unit.
- a control unit that changes the magnetic field according to at least one of position, velocity, and acceleration.
- the present invention is a control method of an input device including a first member and a second member that move relative to each other in response to an input operation, wherein a clearance between the first member and the second member It is a control method of an input device which changes the viscosity of the magnetorheological fluid by causing a magnetic field to act on the magnetorheological fluid existing at least in part.
- the operation feeling can be generated small and quietly.
- FIG. 1st embodiment of the present invention It is a sectional view of an input device concerning a 1st embodiment of the present invention. It is a disassembled perspective view of the input device shown in FIG. It is an expanded sectional view of the input device shown in FIG. It is a schematic diagram of the magnetorheological fluid in the state where the magnetic field is not applied. It is a schematic diagram of the magnetorheological fluid in the state to which the magnetic field is applied. It is a graph which shows the relationship of the electric current and torque which are sent through the magnetic field generation part shown in FIG. It is a block diagram of the control system of the input device shown in FIG. It is a flowchart which shows the control method of the input device shown in FIG. It is sectional drawing of the input device which concerns on 2nd Embodiment. It is the elements on larger scale of the input device concerning a 3rd embodiment.
- FIG. 1 is a cross-sectional view of the input device 100 cut along a plane along the central axis 101 of rotation and viewed in the direction orthogonal to the central axis 101.
- FIG. 2 is an exploded perspective view of the input device 100.
- FIG. 3 is a partial enlarged view of a region 102 of the input device 100 of FIG.
- the vertical direction is defined along the central axis 101, but the direction in actual use is not limited.
- the radial direction refers to a direction away from the central axis 101 in the direction orthogonal to the central axis 101.
- the input device 100 includes a first member 200 and a second member 300 which are rotationally moved in both directions relative to the central axis 101, and further, a spherical member 410 and an annular bearing 420. And The input device 100 further comprises a magnetorheological fluid 500, as shown in FIG.
- the first member 200 includes a first fixed yoke 210, a second fixed yoke 220, a magnetic field generator 230, an annular member 240, an upper case 250, and a lower case 260.
- the first fixed yoke 210 is substantially cylindrical and has a cylindrical fixed inner surface 211 centered on the central axis 101.
- the fixed inner surface 211 penetrates the first fixed yoke 210 in the direction of the central axis 101.
- the fixed inner surface 211 has a substantially circular cross section along a plane orthogonal to the central axis 101.
- the fixed inner surface 211 varies in diameter depending on the position in the vertical direction.
- the first member 200 has an annular cavity 212.
- the annular cavity 212 is a concentric circle whose inner and outer circumferences have a center on the central axis 101 in a cross section orthogonal to the central axis 101.
- the annular cavity 212 is closed at the top, the radially outer side, and the radially inner side, but opens downward.
- a magnetic field generator 230 as shown in FIG. 2 is disposed in the annular cavity 212.
- the magnetic field generator 230 has a shape close to the shape of the annular cavity 212, and the magnetic field generator 230 is a coil including a conducting wire wound around the central axis 101.
- An alternating current is supplied to the magnetic field generation unit 230 through a path not shown. When an alternating current is supplied to the magnetic field generator 230, a magnetic field is generated.
- the first fixed yoke 210 has a fixed lower surface 213. Most of the fixed lower surface 213 is substantially parallel to a plane orthogonal to the vertical direction.
- the second fixed yoke 220 disposed below the first fixed yoke 210 is substantially cylindrical.
- the second fixed yoke 220 has a fixed upper surface 221.
- Most of the fixed upper surface 221 is substantially parallel to a plane orthogonal to the vertical direction.
- the fixed upper surface 221 is provided with an annular groove 222 surrounding the central axis 101. The groove 222 opens upward.
- a first bearing 223 is provided as shown in FIG. The first bearing 223 rotatably receives the spherical member 410 on the upper side.
- the fixed lower surface 213 of the first fixed yoke 210 and the fixed upper surface 221 of the second fixed yoke 220 are substantially parallel, and a gap is formed between the fixed lower surface 213 and the fixed upper surface 221. It is done.
- the annular member 240 is substantially cylindrical, and seals the space between the first fixed yoke 210 and the second fixed yoke 220 from the radially outer side as shown in FIG.
- the upper case 250 covers the upper side and the radially outer side of the first fixed yoke 210, the second fixed yoke 220, and the annular member 240.
- the upper case 250 and the first fixed yoke 210 are fixed by a plurality of screws 270.
- Upper case 250 has a substantially cylindrical through hole 251 in a region including central axis 101.
- the through hole 251 penetrates the upper case 250 in the vertical direction.
- the space surrounded by the fixed inner surface 211 and the space in the through hole 251 communicate in the vertical direction.
- the lower case 260 covers the first fixed yoke 210, the second fixed yoke 220, and the annular member 240 from below.
- the lower case 260, the upper case 250 and the second fixed yoke 220 are fixed by a plurality of screws 270.
- the second member 300 includes a shaft portion 310 and a rotating yoke 320.
- the shaft portion 310 is elongated along the central axis 101, and has a shape in which a plurality of cylinders having different radial diameters are integrally connected in the vertical direction.
- the shaft portion 310 has a portion existing in a space surrounded by the fixed inner surface 211 of the first fixed yoke 210 and the through hole 251 of the upper case 250, and a portion protruding above the upper case 250.
- the shaft portion 310 has a flat surface 311 along the central axis 101 at a part of the outer peripheral surface in the radial direction near the upper end above the upper case 250. In the vicinity of the flat surface 311, a member necessary for the input operation, that is, a member necessary for rotating the shaft portion 310 is appropriately mounted.
- annular bearing 420 is provided between the fixed inner surface 211 of the first fixed yoke 210 and the shaft portion 310.
- the annular bearing 420 realizes smooth rotation of the first fixed yoke 210 and the shaft portion 310.
- the lower end of the shaft portion 310 is provided with a second bearing 312 facing downward.
- the second bearing 312 rotatably receives the spherical member 410 disposed below.
- the radially outer rotational outer surface 313 of the shaft portion 310 is close to the fixed inner surface 211 of the first fixed yoke 210.
- the distance between the outer surface 313 of rotation and the inner surface 211 is substantially constant when viewed in a plane perpendicular to the central axis 101.
- the rotating yoke 320 is a disk-shaped member having a rotating upper surface 321 and a rotating lower surface 322 substantially parallel to a plane orthogonal to the vertical direction.
- the upper rotation surface 321 faces upward, and the lower rotation surface 322 faces downward.
- the rotating yoke 320 is disposed in the space between the first fixed yoke 210 and the second fixed yoke 220.
- a gap is present between the rotation lower surface 322 and the fixed upper surface 221 of the second fixed yoke 220.
- a through hole 323 penetrating the rotation yoke 320 vertically is provided in the vicinity of the central axis 101.
- the lower end of the shaft portion 310 is disposed in the through hole 323 of the rotation yoke 320, and the rotation yoke 320 and the shaft portion 310 are fixed by a plurality of screws 330 shown in FIG. Therefore, the shaft portion 310 and the rotating yoke 320 rotate integrally.
- At least one of the first fixed yoke 210, the second fixed yoke 220, and the rotating yoke 320 be formed of a magnetic material.
- the magnetic field generated from the magnetic field generation unit 230 becomes strong, so power can be saved.
- the magnetorheological fluid 500 exists in a gap radially interposed between the outer surface 313 of the shaft 310 and the fixed surface 211 of the first fixed yoke 210.
- the magnetorheological fluid 500 is present in a gap vertically sandwiched between the upper surface 321 of the rotating yoke 320 and the lower surface 213 of the first fixed yoke 210.
- the magnetorheological fluid 500 is also present in a gap vertically sandwiched between the lower surface 322 of the rotating yoke 320 and the upper surface 221 of the second fixed yoke 220. It is not necessary for all the gaps to be filled with the magnetorheological fluid 500.
- the magnetorheological fluid 500 may be present on only one of the upper surface 321 and the lower surface 322.
- the magnetorheological fluid 500 spreads in contact with the rotary yoke 320 and the fixed yokes 210 and 220 in a thin film shape.
- the magnetorheological fluid 500 is a substance whose viscosity changes when a magnetic field is applied.
- the viscosity of the magnetorheological fluid 500 of this embodiment increases as the strength of the magnetic field increases in a certain range.
- the magnetorheological fluid 500 includes a number of particles 510.
- the particles 510 are, for example, ferrite particles.
- the diameter of the particle 510 is, for example, on the order of micrometers, and may be 100 nanometers.
- the particles 510 are desirably substances that are not easily precipitated by gravity.
- the magnetorheological fluid 500 preferably includes a coupling material 520 that prevents the precipitation of the particles 510.
- a first state in which no current flows in the magnetic field generation unit 230 shown in FIG. 1 will be considered.
- the first state since no magnetic field is generated from the magnetic field generation unit 230, no magnetic field is applied to the magnetorheological fluid 500 shown in FIG.
- FIG. 4A when no magnetic field is applied to the magnetorheological fluid 500, the particles 510 are randomly dispersed. Therefore, the first member 200 and the second member 300 relatively rotate without receiving a large resistance. That is, the operator who operates the shaft portion 310 by hand does not feel much resistance.
- the magnetic field is applied to the magnetorheological fluid 500 shown in FIG.
- FIG. 4B when a magnetic field is applied to the magnetorheological fluid 500, the particles 510 are linearly connected along the direction of the magnetic field indicated by the arrow. A large force is required to shear the coupled particles 510.
- the resistance to movement along the direction orthogonal to the magnetic field is large, the magnetic field is generated such that the component in the direction orthogonal to the relative movement direction of the first member 200 and the second member 300 is large. It is preferable to The magnetorheological fluid 500 exhibits a certain degree of resistance even to movement in a direction inclined to the magnetic field.
- a magnetic field having a component along the central axis 101 is generated in the gap between the rotating yoke 320 and the first fixed yoke 210 and the second fixed yoke 220 shown in FIG.
- the particles 510 of the magnetorheological fluid 500 are connected in the vertical direction or in a direction inclined with respect to the vertical direction, the first member 200 and the second member 300 are relatively difficult to rotate. Become. That is, as a result of the resistance occurring in the direction opposite to the relative movement of the first member 200 and the second member 300, the operator who manually operates the shaft portion 310 feels the resistance.
- the use of the rotating yoke 320 radially outward from the shaft portion 310 in the form of a disk allows the magnetorheological fluid 500 to be applied over a large area as compared with the case of the shaft portion 310 alone. As the area of the magnetorheological fluid 500 is larger, the control range of the resistance is wider.
- the magnetic field is also applied to the magnetorheological fluid 500 present in the gap between the shaft portion 310 and the first fixed yoke 210.
- the larger the radial component of the magnetic field the stronger the resistance between the shaft portion 310 and the first fixed yoke 210.
- the radial component of the magnetic field perpendicular to the central axis 101 is small, a certain degree of resistance can still be felt. If the magnetorheological fluid 500 is arranged around the shaft portion 310 without arranging the magnetorheological fluid 500 above and below the rotating yoke 320, the resistance can be controlled in a smaller area.
- FIG. 5 is a graph of an experimental example, and shows the relationship between the current supplied to the magnetic field generation unit 230 and the torque received by the shaft unit 310.
- the torque corresponds to the resistance.
- FIG. 5 when the current flowing through the magnetic field generation unit 230 is intensified, the magnetic field is increased, so that the resistance between the first member 200 and the second member 300 is increased.
- the current flowing to the magnetic field generation unit 230 is weakened, the magnetic field is reduced, so the resistance between the first member 200 and the second member 300 is reduced.
- FIG. 6 is a block diagram of a control system of the input device 100. As shown in FIG.
- the input device 100 further includes a detection unit 610 and a control unit 620.
- the detection unit 610 detects the relative position between the first member 200 and the second member 300 by mechanical, electromagnetic, optical or other methods.
- the detection unit 610 is, for example, a rotary encoder.
- Control unit 620 controls the strength of the magnetic field generated by magnetic field generation unit 230 in accordance with the position detected by detection unit 610.
- the control unit 620 controls the strength of the magnetic field applied to the magnetorheological fluid 500 by controlling the current supplied to the magnetic field generation unit 230.
- the control unit 620 includes, for example, a central processing unit and a storage unit, and executes control by executing a program stored in the storage unit by the central processing unit.
- the control unit 620 strengthens the magnetic field when, for example, the relative angle between the first member 200 and the second member 300 is within a predetermined range, and weakens the magnetic field when outside the predetermined range. .
- the relationship between the position detected by the detection unit 610 and the strength of the magnetic field may be calculated by calculation, may be specified in advance by a table, or may be specified by another method.
- the detection unit 610 may detect a relative velocity between the first member 200 and the second member 300, or may detect a relative acceleration. The other measured value indicating the relative relationship between the member 200 and the second member 300 may be detected. Controller 620 may change the magnetic field in response to velocity, acceleration, other measurements or other inputs.
- FIG. 7 is a flowchart of a control method by the control unit 620.
- the control unit 620 obtains the measurement value detected by the detection unit 610.
- the measurement value is the relative position of the first member 200 and the second member 300.
- the control unit 620 controls the magnetic field generated by the magnetic field generation unit 230 based on the relationship between the measurement value stored in advance and the current supplied to the magnetic field generation unit 230. Steps 710 and 720 are repeated as necessary.
- the magnetorheological fluid 500 is used to control the resistance to relative rotation between the first member 200 and the second member 300. Compared to using a solid friction force as in the prior art, the operation feeling can be produced quietly.
- various manipulation feels can be created by changing the magnetic field based on the position, velocity, acceleration or other measurement values.
- a plurality of magnetic field generation units 230 may exist, or may generate a magnetic field in a different direction at a position different from that of the present embodiment.
- a direct current may be sufficient. With direct current, it is possible to give the operator a constant vibration according to the magnitude of the current, and it is possible to change the magnitude of the vibration linearly by changing the magnitude of the current.
- the magnitude of the generated magnetic field can be given regular strength and weakness depending on the waveform, and vibration having regular strength and weakness can be given to the operator as an operation feeling. Therefore, when it is desired to generate vibration with regular strength as the operation feeling, it is necessary to perform control such that the magnitude of the current is repeatedly increased and decreased in direct current, but in the case of alternating current, Vibrations with regular strength can be easily generated without such control.
- FIG. 8 shows an input device 800 according to the second embodiment.
- FIG. 8 shows a cross section when the input device 800 is cut at a plane passing through the central axis 801.
- the radial direction refers to a direction away from the central axis 801 in the direction orthogonal to the central axis 801.
- the input device 800 includes a first member 810 and a second member 820 that rotate and move in both directions relative to the central axis 801, and further includes an annular bearing 830 and a magnetorheological fluid 860.
- the first member 810 includes a first fixed yoke 811, a second fixed yoke 812, a third fixed yoke 813, a magnetic field generator 814, an annular member 815, a lid 816, and an end bearing 817.
- the first fixed yoke 811 is provided with an annular notch 840 centered on the central axis 801 at the lower outside.
- a magnetic field generator 814 is disposed in the notch 840.
- the magnetic field generator 814 includes a coil including a conductive wire wound around the notch 840 so as to turn around the central axis 801. An alternating current is supplied to the magnetic field generation unit 814 through a path not shown.
- a portion of the upper part of the first fixed yoke 811 is covered with a disc-like lid 816.
- the second fixed yoke 812 is provided below the first fixed yoke 811.
- the first fixed yoke 811 and the second fixed yoke 812 integrally form a substantially cylindrical outer shape, and confine the magnetic field generating portion 814 inside.
- the second fixed yoke 812 has a fixed lower surface 841. Most of the fixed lower surface 841 is substantially parallel to a plane orthogonal to the central axis 801.
- the first fixed yoke 811, the second fixed yoke 812 and the lid 816 are provided with a fixed inner surface 842 defining a through hole along the central axis 801.
- the cross section orthogonal to the central axis 801 of the fixed inner surface 842 is generally circular at any position in the vertical direction, and the diameter is not constant depending on the position in the vertical direction.
- the first fixed yoke 811 and the second fixed yoke 812 are fixed by a plurality of screws 843.
- the third fixed yoke 813 has a fixed top surface 844. Most of the fixed upper surface 844 is substantially parallel to a plane orthogonal to the central axis 801. That is, most of the fixed lower surface 841 of the second fixed yoke 812 and the fixed upper surface 844 of the third fixed yoke 813 are substantially parallel. Between the fixed lower surface 841 and the fixed upper surface 844, a gap having a substantially constant interval in the vertical direction exists.
- a through hole 845 is provided at the center of the third fixed yoke 813. The space in the through hole 845 is in vertical communication with the space defined by the fixed inner surface 842. End bearings 817 are inserted into the through holes 845 from below using a screw structure.
- the annular member 815 is substantially cylindrical and seals the space between the second fixed yoke 812 and the third fixed yoke 813 from the radially outer side.
- the screw structure provided radially inward of the annular member 815 engages with the screw structure provided radially outward of the second fixed yoke 812 and the third fixed yoke 813 to obtain a second fixed yoke. 812 and the third fixed yoke 813 are fixed.
- the second member 820 includes a shaft portion 821 and a rotating yoke 822.
- the shaft portion 821 is elongated along the central axis 801. When viewed in a cross section orthogonal to the central axis 801, most of the shaft portion 821 at any of the upper and lower positions is a circle with various diameters centered on the central axis 801.
- the shaft portion 821 has a portion present in the first member 810 and a portion protruding upward from the first member 810. In the vicinity of the upper end of the shaft portion 821, a member necessary for the input operation, that is, a member necessary for rotating the shaft portion 821 is appropriately mounted.
- annular bearing 830 is provided between the first fixed yoke 811 and the shaft portion 821.
- the annular bearing 830 realizes smooth rotation of the first fixed yoke 811 and the shaft portion 821.
- the lower end of the shaft portion 821 is provided with a hemispherical portion 851 projecting downward.
- the upper surface of the end bearing 817 has a structure for rotatably receiving the hemispherical portion 851 of the shaft portion 821.
- the shaft portion 821 rotates smoothly while bringing the hemispherical portion 851 into contact with the end bearing 817.
- the rotating yoke 822 is a disk-shaped member having a rotating upper surface 853 and a rotating lower surface 854.
- the rotation upper surface 853 and the rotation lower surface 854 are substantially parallel to a plane orthogonal to the vertical direction.
- the upper rotation surface 853 faces upward, and the lower rotation surface 854 faces downward.
- the rotating yoke 822 is disposed in the space between the second fixed yoke 812 and the third fixed yoke 813.
- a gap is present between the rotation upper surface 853 and the fixed lower surface 841 of the second fixed yoke 812, and a gap is present between the lower rotation surface 854 and the fixed upper surface 844 of the third fixed yoke 813.
- the rotating yoke 822 is provided with a raised portion 855 projecting upward near the central axis 801.
- the raised portion 855 is provided with a through hole vertically penetrating the rotating yoke 822.
- the lower end of the shaft portion 821 is passed through the through hole of the rotation yoke 822 and the rotation yoke 822 and the shaft portion 821 are fixed by a plurality of screws. Therefore, the shaft portion 821 and the rotating yoke 822 rotate integrally.
- the radially outer rotational outer surface 852 of the shaft portion 821 and the raised portion 855 is close to the fixed inner surface 842.
- the shaft portion 821 rotates relative to the first fixed yoke 811 and the second fixed yoke 812, the distance between the outer rotation surface 852 and the fixed inner surface 842 can be viewed in a plane perpendicular to the central axis 801. It is kept approximately constant.
- At least one of the first fixed yoke 811, the second fixed yoke 812, the third fixed yoke 813, and the rotating yoke 822 be formed of a magnetic material.
- the magnetic field generated from the magnetic field generation unit 814 becomes strong, so power can be saved.
- a magnetorheological fluid 860 is present in the gap radially interposed between the outer rotating surface 852 and the fixed inner surface 842.
- a magnetorheological fluid 860 is present in a gap vertically sandwiched between the rotation upper surface 853 of the rotation yoke 822 and the fixed lower surface 841 of the second fixed yoke 812.
- the magnetorheological fluid 860 also exists in a gap vertically sandwiched between the lower surface 854 of the rotating yoke 822 and the upper surface 844 of the third fixed yoke 813. It is not necessary for all gaps to be filled with the magnetorheological fluid 860.
- the magnetorheological fluid 860 may be present on only one of the upper surface 853 and the lower surface 854.
- the magnetorheological fluid 860 spreads in the form of a thin film in contact with the rotating yoke 822, the second fixed yoke 812 and the third fixed yoke 813.
- the first member 810 further includes an O-ring 846 arranged to surround the shaft portion 821 from the radially outer side.
- the O-ring 846 covers a gap that is radially sandwiched between the rotating outer surface 852 and the fixed inner surface 842.
- the shaft portion 821 and the O-ring 846 can be relatively rotated while maintaining the seal.
- the O-ring 846 is made of, for example, rubber.
- the input device 800 according to the present embodiment can be controlled in the same manner as the input device 100 according to the first embodiment, and thus the description thereof is omitted.
- the magnetorheological fluid 860 is used in controlling the resistance to relative rotation between the first member 810 and the second member 820, the motor as in the prior art Compared to using a solid friction force as in the prior art, the operation feeling can be produced quietly. According to the input device 800 of this embodiment, since the O-ring 846 is provided, the magnetorheological fluid 860 can be prevented from flowing above the O-ring 846.
- the input device of the present embodiment further includes a cam portion 910, an abutting member 920, and an elastic member 930 shown in FIG. 9 in the input device 100 of the first embodiment shown in FIG.
- the cam portion 910 of FIG. 9 is provided on one of the first member 200 and the second member 300 of FIG.
- the abutment member 920 and the elastic member 930 of FIG. 9 are provided on the other of the first member 200 and the second member 300 of FIG.
- the cam portion 910 is provided with projections and depressions of a predetermined shape.
- the elastic member 930 biases the contact member 920 fixed at one end toward the cam portion 910.
- the elastic member 930 is, for example, a winding spring, a plate spring, a rubber, a gas spring or the like, but is not limited thereto.
- Vibration occurs when the abutment member 920 moves.
- the control unit 620 illustrated in FIG. 6 changes the operation load when the contact member 920 moves so as to suppress the vibration of the contact member 920. This is because the pressure applied to the cam portion 910 by the elastic member 930 changes.
- the magnetic field generation unit 230 is controlled to change the magnetic field so as to suppress the vibration (operation load fluctuation) generated with respect to the operation load fluctuation generated by the cam curve.
- the vibration is detected by the detection unit 610, and the magnetic field generated by the magnetic field generation unit 230 is changed.
- the relationship between the vibration and the magnetic field may be stored in advance, may be calculated by a calculation formula, or may be obtained by another method.
- the position may be detected by the detection unit 610, and the magnetic field may be changed in a predetermined pattern according to the position.
- the magnetic field may be changed so that the unique load generated by the cam curve can be increased or decreased according to the operation.
- a smooth operation feel can be created.
- the present invention is applicable to various input devices that control the resistance between relatively moving members.
- DESCRIPTION OF SYMBOLS 100 ... Input device 101 ... Central axis 102 ... Area 200 ... 1st member 210 ... 1st fixed yoke 211 ... Fixed inner surface 212 ... Annular cavity 213 ... Fixed lower surface 220 ... 2nd fixed yoke 221 ... Fixed upper surface 222 ... Groove 223 first bearing 230 magnetic field generating portion 240 annular member 250 upper case 251 through hole 260 lower case 270 screw 300 second member 310 shaft portion 311 flat surface 312 second bearing 313 ... rotating outer surface 320 ... rotating yoke 321 ... rotating upper surface 322 ... rotating lower surface 323 ... through hole 330 ... screw 410 ...
- spherical member 420 ... annular bearing 500 ... magnetic viscosity fluid 510 ... particle 520 ... coupling material 610 ... detection unit 620 ... control Section 800
- Input device 801 Central shaft 810 First member 811 First fixed yoke 812 Second fixed yoke 8 3 Third fixed yoke 814 Magnetic field generation portion 815 Annular member 816 Lid portion 817 End bearing 820 Second member 821 Shaft portion 822 Rotational yoke 830 Annular bearing 840 Notch 841 fixed Lower surface 842: Fixed inner surface 843: Screw 844: Fixed upper surface 845: Through hole 846: O ring 851: Hemispherical portion 852: Rotation outer surface 853: Rotation upper surface 854: Rotation lower surface 855: Protrusion 860: Magnetorheological fluid 910: Cam portion 920 ... Contact member 930 ... Elastic member
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Abstract
Description
図1から図3において、説明の便宜上、中心軸101に沿って上下方向を規定しているが、実際の使用時における方向を制限するものではない。半径方向とは、中心軸101から、中心軸101に直交する方向に離れる方向を指す。
環状空洞212内には、図2に示すような磁界発生部230が配設されている。磁界発生部230は、環状空洞212の形状に近い形状をもつ、磁界発生部230は、中心軸101の周りを回るように巻き付けられた導線を含むコイルである。磁界発生部230には、図示しない経路で交流電流が供給される。磁界発生部230に交流電流が供給されると、磁界が発生する。
図1に示すように固定上面221には、中心軸101を囲む環状の溝222が設けられている。溝222は、上方に開口している。図3に示す固定上面221の中央には、図1に示すように第1の軸受223が設けられている。第1の軸受223は、上側で球状部材410を回転自在に受容する。
シャフト部310は、上部ケース250より上方の上端付近において、半径方向の外周面の一部に、中心軸101に沿った平面311をもつ。平面311付近に、適宜、入力操作に必要な部材、すなわち、シャフト部310を回転させるのに必要な部材が搭載される。
シャフト部310の下端には、下方を臨む第2の軸受312が設けられている。第2の軸受312は、下方に配設される球状部材410を回転自在に受容する。球状部材410を第1の軸受223と第2の軸受312とで上下方向において挟むことにより、シャフト部310と第2の固定ヨーク220とが相対的に滑らかに回転する。
回転ヨーク320は、第1の固定ヨーク210と第2の固定ヨーク220との間の空間に配設されている。回転上面321と第1の固定ヨーク210の固定下面213との間に、隙間が存在する。
さらに、回転下面322と第2の固定ヨーク220の固定上面221との間に、隙間が存在する。回転ヨーク320が第1の固定ヨーク210及び第2の固定ヨーク220に対して相対的に回転するとき、回転上面321と固定下面213との間の上下方向の距離は、略一定に保たれ、回転下面322と固定上面221との間の上下方向の距離は、略一定に保たれる。
回転ヨーク320の貫通孔323内に、シャフト部310の下端が配設されており、回転ヨーク320とシャフト部310とは、図2に示す複数のネジ330で固定されている。そのため、シャフト部310と回転ヨーク320とが、一体となって回転する。
回転ヨーク320の回転上面321と第1の固定ヨーク210の固定下面213とに上下方向を挟まれた隙間に、磁気粘性流体500が存在する。
さらに、回転ヨーク320の回転下面322と第2の固定ヨーク220の固定上面221とに上下方向を挟まれた隙間にも、磁気粘性流体500が存在する。必ずしも全ての隙間が磁気粘性流体500で埋められていなくてもよい。例えば、磁気粘性流体500は、回転上面321側と回転下面322側とのいずれか一方のみに存在していてもよい。磁気粘性流体500は、薄い膜状に回転ヨーク320と固定ヨーク210,220に接して広がっている。
粒子510は、例えば、フェライト粒子である。粒子510の直径は、例えば、マイクロメートル台であり、100ナノメートルであってもよい。粒子510は、重力で沈殿しにくい物質であることが望ましい。磁気粘性流体500は、粒子510の沈殿を防ぐカップリング材520を含むことが望ましい。
図4Aに示すように、磁気粘性流体500に磁界が印加されていないと、粒子510はランダムに分散している。従って、第1の部材200と第2の部材300とが、大きな抵抗力を受けずに相対的に回転する。すなわち、シャフト部310を手で操作する操作者が、あまり抵抗力を感じない。
図4Bに示すように、磁気粘性流体500に磁界が印加されると、矢印で示す磁界の方向に沿って粒子510が直線状に連結する。連結した粒子510をせん断するには大きな力が必要となる。
特に、磁界に直交する方向に沿った動きに対する抵抗力が大きいので、第1の部材200と第2の部材300との相対的な移動方向に直交する方向の成分が大きくなるように磁界を発生させることが好ましい。磁界に対して傾斜した方向の動きに対しても、磁気粘性流体500はある程度の抵抗力を示す。
すなわち、第1の部材200と第2の部材300との相対的な移動とは反対方向に抵抗力が生じる結果、シャフト部310を手で操作する操作者が抵抗力を感じる。シャフト部310から半径方向外側に円盤状に広がった回転ヨーク320を使用しているので、シャフト部310だけの場合に比べると大面積に磁気粘性流体500を塗布することができる。磁気粘性流体500の面積が広いほど、抵抗力の制御幅が広い。
本実施形態では、磁界の中の、中心軸101に直交する半径方向の成分は小さいが、それでも、ある程度の抵抗力は感じられる。回転ヨーク320の上下に磁気粘性流体500を配置せずに、シャフト部310の周辺に磁気粘性流体500を配置すると、より小さな面積で抵抗力を制御できる。
制御部620は、例えば、中央演算処理装置と記憶装置とを含み、記憶装置に記憶されたプログラムを中央演算処理装置で実行することにより制御を実行する。制御部620は、例えば、第1の部材200と第2の部材300との相対的な角度が所定の範囲内であるときに磁界を強くし、所定の範囲外であるときに磁界を弱くする。
検出部610によって検出される位置と磁界の強さとの関係は、計算によって算出されてもよいし、予め表によって指定されていてもよく、他の方法によって指定されてもよい。
次に、ステップ720において、制御部620は、予め記憶された、測定値と磁界発生部230に流す電流との関係に基づいて、磁界発生部230で発生させる磁界を制御する。必要に応じてステップ710とステップ720とが繰り返される。
また、本実施例では磁界発生部230に交流電流を供給する例で説明したが、直流電流であっても良い。直流電流では、電流の大きさに応じた一定の振動を操作者に与えることができ、電流の大きさを変えることでリニアに振動の強さを変化させることができる。一方、交流電流では、その波形に応じて、発生する磁界の大きさに規則的な強弱をつけることができ、操作者に対して規則的な強弱をもつ振動を操作感触として与えることができる。そのため、操作感触として規則的な強弱をもつ振動を発生させたいとき、直流電流では電流の大きさを大きくしたり小さくしたりを繰り返すような制御を行う必要があるが、交流電流にすればそのような制御をすることなく容易に規則的な強弱をもつ振動を発生させることができる。
半径方向とは、中心軸801から、中心軸801に直交する方向に離れる方向を指す。入力装置800は、中心軸801を中心として相対的に両方向に回転移動する第1の部材810と第2の部材820とを備え、さらに、環状軸受830と磁気粘性流体860とを備える。
磁界発生部814は、中心軸801の周りを回るように切り欠き840に巻き付けられた導線を含むコイルを含む。磁界発生部814には、図示しない経路で交流電流が供給される。第1の固定ヨーク811の上方の一部が、円盤状の蓋部816で覆われている。
第1の固定ヨーク811と第2の固定ヨーク812と蓋部816とには、中心軸801に沿った貫通孔を画定する固定内面842が設けられている。固定内面842の中心軸801に直交する断面は、上下方向のいずれの位置においても概ね円形であり、上下方向の位置に応じて直径が一定ではない。第1の固定ヨーク811と第2の固定ヨーク812とは、複数のネジ843で固定されている。
固定下面841と固定上面844との間には、上下方向の間隔が略一定の隙間が存在する。第3の固定ヨーク813の中央には、貫通孔845が設けられている。貫通孔845内の空間は、固定内面842により画定される空間と上下方向に連通している。貫通孔845には、下方から端部軸受817がネジ構造を使用してはめ込まれている。
回転上面853と第2の固定ヨーク812の固定下面841との間には隙間が存在し、回転下面854と第3の固定ヨーク813の固定上面844との間には隙間が存在する。回転ヨーク822が第2の固定ヨーク812及び第3の固定ヨーク813に対して相対的に回転するとき、回転上面853と固定下面841との間の上下方向の距離は、略一定に保たれ、回転下面854と固定上面844との間の上下方向の距離は、略一定に保たれる。
さらに、回転ヨーク822の回転下面854と第3の固定ヨーク813の固定上面844とに上下方向を挟まれた隙間にも、磁気粘性流体860が存在する。必ずしも全ての隙間が磁気粘性流体860で埋められていなくてもよい。例えば、磁気粘性流体860は、回転上面853側と回転下面854側とのいずれか一方のみに存在していてもよい。磁気粘性流体860は、薄い膜状に回転ヨーク822と第2の固定ヨーク812と第3の固定ヨーク813とに接して広がっている。
Oリング846は、回転外面852と固定内面842とに半径方向に挟まれた隙間をふさいでいる。シャフト部821とOリング846とは密閉を保ったまま相対的に回転可能である。Oリング846は、例えば、ゴム製である。
弾性部材930は、一端に固定された当接部材920をカム部910に向けて付勢する。カム部910が当接部材920及び弾性部材930に対して相対的に移動すると、当接部材920がカム部910の所定の形状に沿って移動する。弾性部材930は、例えば、巻きばね、板バネ、ゴム、ガススプリングなどであるが、これらに限られない。
101…中心軸
102…領域
200…第1の部材
210…第1の固定ヨーク
211…固定内面
212…環状空洞
213…固定下面
220…第2の固定ヨーク
221…固定上面
222…溝
223…第1の軸受
230…磁界発生部
240…環状部材
250…上部ケース
251…貫通孔
260…下部ケース
270…ネジ
300…第2の部材
310…シャフト部
311…平面
312…第2の軸受
313…回転外面
320…回転ヨーク
321…回転上面
322…回転下面
323…貫通孔
330…ネジ
410…球状部材
420…環状軸受
500…磁気粘性流体
510…粒子
520…カップリング材
610…検出部
620…制御部
800…入力装置
801…中心軸
810…第1の部材
811…第1の固定ヨーク
812…第2の固定ヨーク
813…第3の固定ヨーク
814…磁界発生部
815…環状部材
816…蓋部
817…端部軸受
820…第2の部材
821…シャフト部
822…回転ヨーク
830…環状軸受
840…切り欠き
841…固定下面
842…固定内面
843…ネジ
844…固定上面
845…貫通孔
846…Oリング
851…半球部
852…回転外面
853…回転上面
854…回転下面
855…隆起部
860…磁気粘性流体
910…カム部
920…当接部材
930…弾性部材
Claims (7)
- 入力操作に応じて相対的に移動する第1の部材と第2の部材と、
前記第1の部材と前記第2の部材との間の隙間の少なくとも一部に存在し、磁界に応じて粘性が変化する磁気粘性流体と、
前記磁気粘性流体に作用する磁界を発生させる磁界発生部と
を備える入力装置。 - 前記磁界発生部が、前記第1の部材と前記第2の部材との相対的な移動方向に対して垂直な成分をもつ前記磁界を発生させる
請求項1の入力装置。 - 前記第2の部材が、前記第1の部材に対して相対的に回転し、
前記第1の部材と前記第2の部材との回転の中心軸に沿う方向において前記第1の部材と前記第2の部材との間に形成される隙間の少なくとも一部に、前記磁気粘性流体が存在する
請求項1または請求項2の入力装置。 - 前記第2の部材が、前記第1の部材に対して相対的に回転し、
前記第1の部材と前記第2の部材との回転の中心軸に直交する方向において前記第1の部材と前記第2の部材との間に形成される隙間の少なくとも一部に、前記磁気粘性流体が存在する
請求項1または請求項2の入力装置。 - 前記磁界発生部を制御して前記磁界を変化させる制御部をさらに備え、
前記第1の部材と前記第2の部材との一方が、所定の形状を有するカム部を含み、
前記第1の部材と前記第2の部材との他方が、当接部材と前記当接部材を前記カム部に向けて弾性的に付勢する弾性部材とを含み、
前記所定の形状に応じて移動する前記当接部材の振動を抑制するように、前記制御部が前記磁界発生部を制御して前記磁界を変化させる
請求項1から請求項4のいずれかの入力装置。 - 前記第1の部材と前記第2の部材との相対的な位置と速度と加速度との少なくとも1つを検出する検出部と、
前記磁界発生部を制御して前記相対的な位置と速度と加速度との少なくとも1つに応じて前記磁界を変化させる制御部と、
をさらに備える、請求項1から請求項4のいずれかの入力装置。 - 入力操作に応じて相対的に移動する第1の部材と第2の部材とを備える入力装置の制御方法であって、
前記第1の部材と前記第2の部材との間の隙間の少なくとも一部に存在する磁気粘性流体に磁界を作用させて前記磁気粘性流体の粘性を変化させる
入力装置の制御方法。
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US11532447B2 (en) | 2022-12-20 |
US20180090289A1 (en) | 2018-03-29 |
EP3312699A4 (en) | 2018-07-04 |
US10658139B2 (en) | 2020-05-19 |
EP3312699A1 (en) | 2018-04-25 |
KR102154344B1 (ko) | 2020-09-09 |
CN109933125A (zh) | 2019-06-25 |
JP6483885B2 (ja) | 2019-03-13 |
CN107636556B (zh) | 2019-04-05 |
JP6568616B2 (ja) | 2019-08-28 |
JP6585172B2 (ja) | 2019-10-02 |
EP3312699B1 (en) | 2023-06-07 |
CN107636556A (zh) | 2018-01-26 |
US11322324B2 (en) | 2022-05-03 |
JPWO2016208455A1 (ja) | 2018-03-15 |
KR102154346B1 (ko) | 2020-09-09 |
KR20180020243A (ko) | 2018-02-27 |
US20200243288A1 (en) | 2020-07-30 |
KR102084639B1 (ko) | 2020-03-04 |
US20200243289A1 (en) | 2020-07-30 |
JP2018120614A (ja) | 2018-08-02 |
JP2018120615A (ja) | 2018-08-02 |
CN109933125B (zh) | 2021-06-01 |
KR20200024351A (ko) | 2020-03-06 |
KR20200024353A (ko) | 2020-03-06 |
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