Rotating apparatus and mouse

Abstract

To provide a rotating apparatus that provides a new operational feeling.SOLUTION: A rotating apparatus (30) comprises a housing (36), a rotatable rotating member (35) accommodated inside the housing, a magnetorheological fluid (40) disposed in a first gap (33) and a second gap (34), and a rotating shaft (42) supported by the housing at the center thereof and rotating integrally with the rotating member. The iron powder concentration in the magnetorheological fluid is 20 to 30 vol%.SELECTED DRAWING: Figure 3

Description

[Technical field]

[0001] The present invention relates to a rotating device and a mouse. [Background technology]

[0002] Conventionally, there are known techniques for achieving both free spin and a clicking sensation when rotating a mouse wheel. For example, Patent Document 1 discloses a technique for achieving both free spin and a clicking sensation by controlling the current flowing through a coil using a permanent magnet. Patent Document 2 discloses a technique for achieving both free spin and a clicking sensation by using a mechanism that uses two lever arms and a lever extending between the two lever arms so as to be rotatable around a rotation axis. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] US Patent Application Publication No. 2022 / 0093303 [Patent Document 2] US Patent Application Publication No. 2023 / 0124218 Summary of the Invention [Problem to be solved by the invention]

[0004] In recent years, with the development of e-sports, gaming mice specialized for game operations have been actively developed. Such gaming mice are required to have high levels of accuracy and operability. However, the technologies described in Patent Documents 1 and 2 only provide a constant clicking sensation to users, and are unable to meet the diverse needs of users.

[0005] An object of one aspect of the present invention is to provide a rotation device and a mouse that provide a new operational sensation. [Means for solving the problem]

[0006] In order to solve the above problems, a rotating device according to one embodiment of the present invention is a rotating device comprising: a housing having a first surface and a second surface opposing the first surface; a rotatable rotating member housed inside the housing and having a first opposing surface opposing the first surface across a first gap and a second opposing surface opposing the second surface across a second gap; a magnetorheological fluid present in the first gap and the second gap; and a rotating shaft supported by the housing at a center of the housing and rotating integrally with the rotating member, wherein the iron powder concentration in the magnetorheological fluid is 20 to 30 vol%.

[0007] According to the above configuration, by setting the iron powder concentration of the magnetorheological fluid to 20 to 30 vol%, it is possible to significantly reduce the non-excitation torque while maintaining the maximum excitation torque, and it is possible to realize free spin while varying the magnitude and cycle of the clicking sensation felt by the user, thereby providing the user with a new operational sensation.

[0008] The magnetorheological fluid was heated at 25° C. and a shear rate of 100 s -1 The viscosity at this time may be 0.3 Pa·s or less.

[0009] According to the above configuration, sufficient free spin can be achieved by setting the viscosity at high speed rotation to 0.3 Pa·s or less.

[0010] The size of the rotating member may be Φ13 mm or less.

[0011] According to the above configuration, the rotating device can be made into a size suitable for a small rotating input device such as a mouse wheel. In addition, in a rotating input device of such a size, an appropriate clicking feeling and free spin operation feeling can be realized. Furthermore, making the rotating member smaller also contributes to making the mouse lighter.

[0012] The size of the rotating shaft may be Φ1.4 mm or less.

[0013] According to the above configuration, by making the rotating shaft thinner, the contact area between the rotating shaft and the bearing is reduced, and the moment due to the contact resistance is also reduced. Therefore, the torque during high-speed rotation can be reduced, and free spin can be achieved. In addition, making the rotating shaft thinner also contributes to making the mouse lighter.

[0014] The device may further include an X-ring that seals the rotating shaft between the first surface and the first opposing surface.

[0015] According to the above configuration, by using an X-ring that has less resistance than an O-ring as a sealing member that prevents leakage of the magnetorheological fluid, the torque during high speed rotation can be reduced, and free spin can be achieved.

[0016] The rotating member may be constructed from stainless steel.

[0017] According to the above-mentioned configuration, by forming the rotating member from stainless steel, the inertia can be made larger than when it is formed from resin, and the free spin time can be made longer.

[0018] In order to solve the above problems, a mouse according to one embodiment of the present invention includes a housing having a first surface and a second surface opposite the first surface, a rotatable rotating member housed inside the housing and having a first opposing surface opposite the first surface across a first gap and a second opposing surface opposite the second surface across a second gap, a magnetorheological fluid present in the first gap and the second gap, a rotating device having a rotating shaft supported by the housing at the center of the housing and rotating integrally with the rotating member, and a mouse wheel through which the rotating shaft is inserted, wherein the iron powder concentration of the magnetorheological fluid is 20 to 30 vol%.

[0019] According to the above configuration, by setting the iron powder concentration of the magnetorheological fluid to 20 to 30 vol%, it is possible to significantly reduce the non-excitation torque while maintaining the maximum excitation torque, and it is possible to realize free spin while varying the magnitude and cycle of the clicking sensation felt by the user, thereby providing the user with a new operational sensation.

[0020] The mouse wheel may be constructed from stainless steel.

[0021] According to the above-mentioned configuration, the inertia can be made larger than that of a mouse wheel made of resin, and the free spin time can be made longer. Effect of the Invention

[0022] According to one aspect of the present invention, it is possible to provide a new operational sensation. [Brief description of the drawings]

[0023] [Figure 1] 1 is a schematic see-through perspective view showing an example of the internal structure of a mouse 1 to which a rotation device 30 of the present invention is applied. [Diagram 2] FIG. 2 is a top view of the rotation device 30 according to the embodiment of the present invention. [Diagram 3] 3 is a cross-sectional view taken along line AA in FIG. 2. [Figure 4] 13 is a graph showing the relationship between the iron powder concentration in the magnetorheological fluid 40 and the free spin time of the mouse wheel 20. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, an embodiment according to one aspect of the present invention (hereinafter also referred to as "the present embodiment") will be described with reference to the drawings. The drawings used in the following description are schematic and do not necessarily reflect the actual product. For the convenience of illustration and ease of understanding, the scale and aspect ratios may be changed from the actual product and may be shown exaggerated. The same or corresponding parts in the drawings are given the same reference numerals and their description will not be repeated.

[0025] §1 Examples of application Fig. 1 is a schematic perspective view showing an example of the internal structure of a mouse 1 to which a rotation device 30 of the present invention is applied. As shown in Fig. 1, the mouse 1 includes a housing 10, a mouse wheel 20 that receives a rotation operation by a user, and a rotation device 30 that rotates in conjunction with the rotation of the mouse wheel 20. The mouse wheel 20 is housed within the housing 10 except for the portion that the user touches for operation.

[0026] The mouse 1 will be described as a gaming mouse specialized for gaming operations, but is not limited to this and may be a mouse used with a general-purpose personal computer.

[0027] The inside of the rotating device 30 is filled with a magnetorheological fluid, which will be described later. The rotating device 30 can generate a torque according to the rotation of the mouse wheel 20 due to the viscosity of the magnetorheological fluid. This makes it possible to vary the magnitude and period of the clicking sensation felt by the user. In this embodiment, the "click sensation" refers to the so-called step sensation felt by the user with his / her fingertips when the user rotates the mouse wheel 20.

[0028] In this embodiment, the iron powder concentration in the magnetorheological fluid is set to 20 to 30 vol %, which allows the size and cycle of the clicking sensation felt by the user to be variable while also realizing free spins, providing the user with a new operational sensation.

[0029] §2 Configuration Example (Configuration example of the rotation device 30) Fig. 2 is a top view of the rotation device 30 according to this embodiment. Fig. 3 is a cross-sectional view taken along line AA in Fig. 2. An example of the configuration of the rotation device 30 will be described with reference to Figs.

[0030] As shown in Fig. 3, the rotation device 30 includes a rotating shaft 42 as a movable shaft rotatable around an axis 41, and a housing 36 that houses the rotating shaft 42 with a part of the rotating shaft 42 inserted therethrough. In Fig. 3, the up-down direction is defined along the axis 41, but this up-down direction is defined for the sake of convenience of explanation and does not limit the up-down direction in the usage state or usage posture of the rotation device 30.

[0031] The rotating shaft 42 is inserted into a shaft hole formed in the center of the housing 36 and is rotatably supported via a bearing 43. The material of the rotating shaft 42 is not particularly limited, but may be, for example, a non-magnetic material. A rotating member 35 that rotates integrally with the rotating shaft 42 is fixed to the lower side of the rotating shaft 42. The size of the rotating shaft 42 is not particularly limited, but may be, for example, Φ1.4 mm or less.

[0032] The first yoke 38 and the second yoke 39 function as yokes that form a magnetic circuit around the coil 45, and also function as a casing, i.e., a housing 36, of the rotating device 30. The first yoke 38 and the second yoke 39 are each made of a magnetic material. Within the first yoke 38 and the second yoke 39, a space that houses the coil 45, a space that houses the bearing 43 and the rotating shaft 42, a space that houses the rotating member 35 so as to be able to rotate freely, and a space filled with the magnetorheological fluid 40 are formed. The first yoke 38, the second yoke 39, and the rotating member 35 transmit torque to each other via the magnetorheological fluid 40.

[0033] The first yoke 38 is provided above the rotating member 35. The rotating shaft 42 is inserted into a shaft hole formed in the first yoke 38. In the present embodiment, as an example, the first yoke 38 is formed in a substantially circular ring shape centered on the axis 41.

[0034] The second yoke 39 is provided so that the rotating member 35 is interposed between the second yoke 39 and the first yoke .

[0035] The rotating member 35 is a disk-shaped disk having a predetermined thickness in the vertical direction. However, the shape of the rotating member 35 is not limited thereto, and may be a cylindrical shape with one side closed and the other side open. When the rotating member 35 is configured to be cylindrical, the vertical direction of the closed side and the open side does not matter. That is, the closed side may be on the upper side and the open side on the lower side, or the closed side may be on the lower side and the open side on the upper side. The material of the rotating member 35 is not particularly limited, and may be, for example, a magnetic material. Examples of the magnetic material include ferromagnetic materials such as iron, nickel, cobalt, and alloys thereof. The material of the rotating member 35 may be stainless steel, such as SUS304. The size of the rotating member 35 is not particularly limited, and may be, for example, Φ13mm or less.

[0036] The housing 36 has a first surface 31a and a second surface 31b opposite to the first surface 31a. In terms of the up-down direction in Fig. 3, the first surface 31a can be said to be the upper surface of the housing 36 (see also Fig. 2). The second surface 31b can be said to be the lower surface or bottom surface of the housing 36.

[0037] The rotating member 35 is housed inside a housing 36, and has a first opposing surface 32a opposing the first surface 31a via a first gap 33, and a second opposing surface 32b opposing the second surface 31b via a second gap 34. The first gap 33 and the second gap 34 are spaces filled with a magnetorheological fluid 40.

[0038] An X-ring 46 is provided between the first surface 31a and the first gap 33. The X-ring 46 functions as a sealing member that seals the gap between the first surface 31a and the first gap 33 so as to prevent the magnetorheological fluid 40 from leaking upward. In this embodiment, the X-ring 46, which has less resistance than an O-ring, is used.

[0039] The space filled with the magnetorheological fluid 40 and the space housing the coil 45 are sealed by a sealing member 44 so that the magnetorheological fluid 40 does not leak to the coil 45 side. The sealing member 44 is not particularly limited, but is, for example, a rubber packing.

[0040] (Magnetorheological Fluid 40) Here, the magnetorheological fluid 40 will be described. The magnetorheological fluid 40 is also called MR fluid (MR: Magneto Rheological), and is a liquid in which magnetic particles are dispersed in a base oil, which is a dispersion medium. These magnetic particles are mainly made of magnetic materials such as iron, nickel, and cobalt, and have a size on the nano-order or micro-order. The base oil is not particularly limited, but one example is hydrophobic silicone oil.

[0041] The magnetorheological fluid 40 has the property of flowing like a normal liquid, but a distinctive property is that the viscosity of the liquid changes in response to an external magnetic field.

[0042] When no magnetic field is generated by the coil 45, the magnetic particles are dispersed in the liquid. When a magnetic field is generated by applying a current to the coil 45, a magnetic force is applied to the magnetorheological fluid 40, and the magnetic particles dispersed in the liquid gather along the magnetic field lines and connect to each other to form clusters. This increases the viscosity of the liquid. The degree of cluster formation can be controlled by the magnetic field, so it is possible to adjust the viscosity by controlling the magnetic field.

[0043] When a force is applied to rotate the rotating shaft 42 in a state in which clusters have been formed, a shear stress acts on the linked magnetic particles, and a resistance force, i.e., a torque, is generated by these magnetic particles.

[0044] The property of the magnetorheological fluid 40, whose viscosity changes according to magnetic force, is utilized in various fields. For example, since the hardness of the damper can be changed instantly by adjusting an external magnetic field, the magnetorheological fluid 40 can be used as a controllable damper to improve the vibration damping performance of a vehicle suspension system.

[0045] With a mouse 1 having a rotating device 30 filled with such a magnetorheological fluid 40, the click feeling can be changed to a cycle of 5 degrees, which is smaller than that of a conventional mouse, or even smaller, to 1 degree, whereas with a conventional mouse the click feeling is fixed at a predetermined cycle (for example, 15 degrees). Furthermore, it is also possible to change the magnitude of the click feeling. Users can customize the click feeling to suit their own preferences and playing style.

[0046] In this way, the magnetorheological fluid 40 can provide the user with a wide variety of clicking sensations. On the other hand, when the magnetorheological fluid 40 is used, it may be difficult to achieve a free spin of the mouse wheel 20. This point will be explained below. In the following, the "free spin of the mouse wheel 20" may be simply referred to as "free spin".

[0047] Conventionally, there is known a technique for switching between "Mode 1," which gives a clicking sensation, and "Mode 2," which does not give a clicking sensation, depending on how the mouse wheel is moved. More specifically, there is known a technique in which, while a clicking sensation is obtained by slowly rotating the mouse wheel, if the mouse wheel is rotated vigorously, the mode automatically switches from Mode 1 to Mode 2, enabling high-speed scrolling with free spins.

[0048] Such conventional mice do not use magnetorheological fluid 40. Here, the relationship between the rotation speed and torque of the mouse wheel 20 when magnetorheological fluid 40 is used will be explained. The faster the rotation speed of the mouse wheel 20, the greater the torque. Since the free spin time is inversely proportional to the torque, an increase in torque acts as a braking factor against the rotation of the mouse wheel 20.

[0049] Here is an example of a specific experimental result. The torque was 0.34 gcm when the mouse wheel 20 rotated at a low speed (e.g., 1 rad / s), while the torque was as high as 11 gcm when the mouse wheel 20 rotated at a high speed (e.g., 100 rad / s). Such a high torque acts as a brake on the rotation of the mouse wheel 20, making it difficult to achieve a free spin.

[0050] In addition, in a conventional mouse that does not use magnetorheological fluid 40, the torque is often constant (for example, 1 gcm or less) regardless of the rotation speed of the mouse wheel.

[0051] The inventors conducted extensive research to reduce the torque generated when the mouse wheel 20 is rotated at high speed. The inventors discovered that the torque generated when the mouse wheel 20 is rotated at high speed can be reduced by setting the iron powder concentration in the magnetorheological fluid 40 to 20 to 30 vol %, and thus completed the present invention.

[0052] (Properties of magnetorheological fluid 40) Here, we will explain the characteristics of the magnetorheological fluid 40. The magnetorheological fluid 40 has the properties of a Newtonian fluid. A "Newtonian fluid" refers to a fluid in which the shear stress of the fluid is proportional to the shear rate.

[0053] The properties of the magnetorheological fluid 40 are expressed by Equation 1.

[0054]

number

[0055] (Relationship between iron powder concentration in magnetorheological fluid 40 and free spin time of mouse wheel 20) FIG. 4 is a graph showing the relationship between the iron powder concentration in magnetorheological fluid 40 and the free spin time of mouse wheel 20. In FIG. 4, the horizontal axis indicates the iron powder concentration in magnetorheological fluid 40, and the vertical axis indicates the free spin time of mouse wheel 20. The inventors measured the free spin time of mouse wheel 20 when the iron powder concentration in magnetorheological fluid 40 was set to 28 vol% and 40 vol%. The measurements were performed in two patterns: actual measurement and simulation. The measurement results are shown in FIG. 4.

[0056] 4, in actual measurements, when the iron powder concentration in the magnetorheological fluid 40 was 28 vol%, the free spin time of the mouse wheel 20 was approximately 0.60 s. On the other hand, when the iron powder concentration in the magnetorheological fluid 40 was 40 vol%, the free spin time of the mouse wheel 20 was approximately 0.42 s.

[0057] Furthermore, in the simulation results, when the iron powder concentration in the magnetorheological fluid 40 was 28 vol%, the free spin time of the mouse wheel 20 was approximately 0.85 s. On the other hand, when the iron powder concentration in the magnetorheological fluid 40 was 40 vol%, the free spin time of the mouse wheel 20 was approximately 0.42 s.

[0058] Thus, both the actual measurement results and the simulation results show that the free spin time of the mouse wheel 20 is longer when the iron powder concentration in the magnetorheological fluid 40 is 28 vol% compared to 40 vol%. In other words, by increasing the iron powder concentration in the magnetorheological fluid 40 to 28 vol%, the torque during high-speed rotation is reduced from 11 gcm to 3.4 gcm, and a longer free spin is achieved.

[0059] Although details are omitted, even when the iron powder concentration in the magnetorheological fluid 40 is set to 20 to 30 vol %, longer free spins are realized compared to when the concentration is 40 vol %.

[0060] When the iron powder concentration in the magnetorheological fluid 40 is high (e.g., 40 vol%), the interaction between the iron powder particles increases the shear stress when demagnetized, and the demagnetized torque corresponding to the shear stress when demagnetized also increases. In contrast, the shear stress when demagnetized decreases by lowering the iron powder concentration. If the iron powder concentration is 20 to 30 vol%, the shear stress when demagnetized is significantly reduced compared to when the iron powder concentration is 40 vol%.

[0061] Regarding the clicking sensation, if the dynamic range of the magnetorheological fluid 40 is 50 times or more, the user will feel a clicking sensation, but if it is about 10 times, the user will not feel a clicking sensation. In order to maintain the maximum excitation torque required to make the dynamic range of the magnetorheological fluid 40 50 times or more, it is preferable that the maximum shear stress is 25 kPa or more. If the iron powder concentration of the magnetorheological fluid 40 is 20 to 30 vol%, the maximum shear stress will be 25 kPa or more.

[0062] In this way, if the iron powder concentration of the magnetorheological fluid 40 is 20 to 30 vol%, it is possible to significantly reduce the de-excitation torque while maintaining the maximum excitation torque at which the user feels a clicking sensation, and it is possible to realize free spins while varying the magnitude and period of the clicking sensation felt by the user.

[0063] (Action and effect) As described above, the rotation device 30 and the mouse 1 according to this embodiment provide the following advantages.

[0064] The rotating device 30 comprises a housing 36 having a first surface 31a and a second surface 31b opposite to the first surface 31a, a rotatable rotating member 35 housed inside the housing 36 and having a first opposing surface 32a opposite to the first surface 31a via a first gap 33 and a second opposing surface 32b opposite to the second surface 31b via a second gap 34, a magnetorheological fluid 40 interposed between the first gap 33 and the second gap 34, and a rotating shaft 42 supported by the housing 36 at the center of the housing 36 and rotating integrally with the rotating member 35.

[0065] The iron powder concentration in the magnetorheological fluid 40 is 20 to 30 vol %.

[0066] According to the above configuration, by setting the iron powder concentration of the magnetorheological fluid 40 to 20-30 vol%, it is possible to significantly reduce the non-excitation torque while maintaining the maximum excitation torque, and it is possible to realize free spin while varying the magnitude and cycle of the clicking sensation felt by the user, thereby providing the user with a new operational sensation.

[0067] Users can customize the feel of the controls to suit their preferences and playing style, allowing them to perform more comfortable and accurate operations. In e-sports tournaments, games can be played for long periods of time. A mouse1 that provides a comfortable feel can reduce fatigue in the hands and fingers even when used for long periods of time. In addition, when fine operations are required, the click feeling allows for precise operations, while in situations where long distance scrolling at high speed is required, high speed scrolling with free spins is possible.

[0068] The iron powder concentration in the magnetorheological fluid 40 is preferably 20 to 28 vol %.

[0069] In addition, as a method for reducing the torque when the mouse wheel 20 is rotated at high speed, a shear rate of 100 s at 25° C. -1 The viscosity of the magnetorheological fluid 40 at this time may be set to 0.3 Pa·s or less.

[0070] According to the above configuration, sufficient free spin can be achieved by setting the viscosity at high speed rotation to 0.3 Pa·s or less.

[0071] In addition, when the viscosity of the magnetorheological fluid 40 at 25° C. is set to 0.3 Pa·s or less, it is a prerequisite that the iron powder concentration in the magnetorheological fluid 40 is set to 20 to 30 vol %.

[0072] Moreover, the size of the rotating member 35 may be set to Φ13 mm or less.

[0073] According to the above configuration, the rotation device 30 can be made into a size suitable for a small rotation input device such as the mouse wheel 20. Furthermore, in a rotation input device of such a size, an appropriate clicking feeling and free spin operation feeling can be realized. Furthermore, making the rotation member 35 smaller contributes to making the mouse 1 lighter.

[0074] When the size of the rotating member 35 is set to Φ13 mm or less, it is a prerequisite that the iron powder concentration of the magnetorheological fluid 40 is set to 20 to 30 vol %, but it is optional to set the viscosity of the magnetorheological fluid 40 at 25°C to 0.3 Pa s or less.

[0075] In addition, as a method for reducing the torque when the mouse wheel 20 is rotated at high speed, the size of the rotation shaft 42 may be set to Φ1.4 mm or less.

[0076] According to the above configuration, by thinning the rotating shaft 42, the contact area between the rotating shaft 42 and the bearing 43 is reduced, and the moment due to the contact resistance is also reduced. This makes it possible to reduce the torque during high-speed rotation, and achieve free spin. Furthermore, thinning the rotating shaft 42 also contributes to making the mouse 1 lighter.

[0077] When setting the size of the rotating shaft 42 to Φ1.4 mm or less, it is a prerequisite that the iron powder concentration of the magnetorheological fluid 40 is 20 to 30 vol %, but the viscosity of the magnetorheological fluid 40 at 25° C. can be set to 0.3 Pa s or less and the size of the rotating member 35 can be set to Φ13 mm or less, and any combination of these can be used.

[0078] In addition, as a method for reducing the torque when the mouse wheel 20 is rotated at high speed, the rotation device 30 may further include an X-ring 46 that seals the rotation shaft 42 between the first surface 31a and the first opposing surface 32a.

[0079] According to the above configuration, by using the X-ring 46, which has less resistance than an O-ring, as a sealing member for preventing leakage of the magnetorheological fluid 40, the torque during high speed rotation can be further reduced, and free spin can be achieved.

[0080] When providing the X-ring 46, it is a prerequisite that the iron powder concentration in the magnetorheological fluid 40 is 20 to 30 vol %, but the viscosity of the magnetorheological fluid 40 at 25°C should be 0.3 Pa s or less, the size of the rotating member 35 should be Φ13 mm or less, and the size of the rotating shaft 42 should be Φ1.4 mm or less, and these and any combinations may be used.

[0081] The rotating member 35 may also be made of stainless steel.

[0082] According to the above configuration, by making the rotating member 35 out of stainless steel, the inertia can be increased compared to when it is made out of resin, and the free spin time can be extended. The inertia can be calculated by the difference in specific gravity, which is 7.93 for stainless steel and 1.05 for resin, resulting in a difference of about 7.6 times.

[0083] When the rotating member 35 is made of stainless steel, it is a prerequisite that the iron powder concentration of the magnetorheological fluid 40 is 20 to 30 vol %, but the viscosity of the magnetorheological fluid 40 at 25°C is 0.3 Pa s or less, the size of the rotating member 35 is Φ13 mm or less, the size of the rotating shaft 42 is Φ1.4 mm or less, and an X-ring 46 is provided, and these and any combinations are optional.

[0084] The mouse wheel 20 may also be constructed from stainless steel.

[0085] According to the above-mentioned configuration, the inertia can be made larger than that of a mouse wheel made of resin, and the free spin time can be made longer.

[0086] The present invention is not limited to the above-described embodiment, and various modifications are possible within the scope of the claims.

[0087] 〔summary〕 The present invention can also be expressed as follows.

[0088] A rotating device according to a first aspect of the present invention includes a housing having a first surface and a second surface opposite to the first surface, a rotatable rotating member housed inside the housing and having a first opposing surface opposite to the first surface across a first gap and a second opposing surface opposite to the second surface across a second gap, a magnetorheological fluid present in the first gap and the second gap, and a rotating shaft supported by the housing at a center of the housing and rotating integrally with the rotating member, wherein the iron powder concentration in the magnetorheological fluid is 20 to 30 vol%.

[0089] A rotating device according to a second aspect of the present invention is the above-mentioned first aspect, wherein the magnetorheological fluid is heated at 25° C. at a shear rate of 100 s -1 The viscosity at this time may be 0.3 Pa·s or less.

[0090] A rotation device according to a third aspect of the present invention may be configured in such a manner that, in the first or second aspect, the size of the rotation member is Φ13 mm or less.

[0091] A rotating device according to a fourth aspect of the present invention may be configured in any one of the first to third aspects, wherein the size of the rotating shaft is Φ1.4 mm or less.

[0092] The rotation device according to a fifth aspect of the present invention may be any one of the first to fourth aspects, further comprising an X ring that seals the rotation shaft between the first surface and the first opposing surface.

[0093] A rotating device according to a sixth aspect of the present invention is any one of the first to fifth aspects, wherein the rotating member is made of stainless steel.

[0094] A mouse according to a seventh aspect of the present invention comprises a housing having a first surface and a second surface opposite the first surface, a rotatable rotating member housed inside the housing and having a first opposing surface opposite the first surface across a first gap and a second opposing surface opposite the second surface across a second gap, a magnetorheological fluid interposed between the first gap and the second gap, a rotating device having a rotating shaft supported by the housing at the center of the housing and rotating integrally with the rotating member, and a mouse wheel through which the rotating shaft is inserted, wherein the iron powder concentration of the magnetorheological fluid is 20 to 30 vol%.

[0095] A mouse according to an eighth aspect of the present invention is the mouse according to the seventh aspect above, wherein the mouse wheel is made of stainless steel. [Explanation of symbols]

[0096] 1 Mouse 20 Mouse Wheel 30 Rotating device 31a First Side 31b Second Face 32a first opposing surface 32b Second opposing surface 33 The First Gap 34 The Second Gap 35 Rotating parts 36 Case 40 Magnetorheological Fluid 42 Rotation axis

Claims

1. a housing having a first surface and a second surface opposite to the first surface; a rotatable rotating member that is accommodated inside the housing and has a first opposing surface that faces the first surface across a first gap and a second opposing surface that faces the second surface across a second gap; a magnetorheological fluid present in the first gap and the second gap; A rotating device including a rotating shaft supported by the housing at a center thereof and rotating integrally with the rotating member, The iron powder concentration of the magnetorheological fluid is 20 to 30 vol%. Rotating device.

2. The magnetorheological fluid is heated at 25° C. and a shear rate of 100 s －１ The viscosity is 0.3 Pa s or less. The rotating device according to claim 1 .

3. The size of the rotating member is Φ13 mm or less. A rotating device according to claim 1 or 2.

4. The size of the rotating shaft is Φ1.4 mm or less. A rotating device according to claim 1 or 2.

5. Further comprising an X-ring that seals the rotating shaft between the first surface and the first opposing surface. A rotating device according to claim 1 or 2.

6. The rotating member is made of stainless steel. A rotating device according to claim 1 or 2.

7. a housing having a first surface and a second surface opposite to the first surface; a rotatable rotating member that is accommodated inside the housing and has a first opposing surface that faces the first surface across a first gap and a second opposing surface that faces the second surface across a second gap; a magnetorheological fluid present in the first gap and the second gap; a rotating device having a rotating shaft supported by the housing at the center thereof and rotating integrally with the rotating member; a mouse wheel through which the rotation shaft is inserted; The iron powder concentration of the magnetorheological fluid is 20 to 30 vol%. mouse.

8. The mouse wheel is made of stainless steel. The mouse of claim 7.

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