CN111290641A

CN111290641A - Mouse roller device

Info

Publication number: CN111290641A
Application number: CN201811494068.4A
Authority: CN
Inventors: 施佑谚
Original assignee: Primax Electronics Ltd
Current assignee: Primax Electronics Ltd
Priority date: 2018-12-07
Filing date: 2018-12-07
Publication date: 2020-06-16
Anticipated expiration: 2038-12-07
Also published as: CN111290641B

Abstract

The invention provides a mouse roller device which comprises a roller, a sensing unit, an electromagnet and a control unit. The roller comprises a ring-shaped magnet and a rotating shaft extending along a first direction. The roller drives the ring magnet to rotate along the rotating shaft in response to the external force. The sensing unit is adjacent to the roller and used for sensing the magnetic pole of the ring-shaped magnet. The roller is positioned between the electromagnet and the sensing unit, and the electromagnet and the annular magnet of the roller generate magnetic force. The control unit is electrically connected with the sensing unit and the electromagnet. The control unit controls the electromagnet and the annular magnet of the roller to generate magnetic force according to the magnetic poles of the annular magnet sensed by the sensing unit.

Description

Mouse roller device

Technical Field

The present disclosure relates to roller devices, and particularly to a roller device for an input device.

Background

In the current information era, electronic devices such as computers have been popularized, and each household almost has more than one computer, and the importance of the mouse for connecting the computer and the user is undoubted, so the number of inventions related to improvement or new functions of the mouse device is increasing year by year.

The mouse is used for controlling a cursor on a computer screen and operating the computer accordingly. Since 1968, the first mouse made in the united states, whether for paperwork, electronic games, industrial graphics, design graphics or media production, has become an indispensable part of computer equipment. The early mouse uses the trackball as the detection of the mouse displacement, and with the progress of science and technology and in order to improve the working efficiency thereof, the mouse slowly evolves to the form of displacement detection using the optical or laser module so far. In addition, in order to improve the functionality and convenience of the mouse, the mouse has also evolved from the earliest wired single-key mouse to the current wireless multi-key roller mouse. In order to meet different industrial requirements or personal preferences, home appliance manufacturers have also begun to manufacture various types of mice to meet the operating requirements of different users, and how to improve the comfort and sensitivity of the mouse buttons, such as left and right buttons, middle button pressing or operation, has become more and more important.

Besides the left and right buttons, the mouse wheel is the most commonly used button for computer users, such as browsing web pages or moving cursors by rotating the wheel, or outputting middle button signals or switching between different function modes by pressing the wheel. In order to improve the convenience and comfort of roller operation, in the prior art, there is proposed a roller module of an input device in taiwan patent publication No. I448928, in which one to two different tooth-shaped surfaces are disposed in a groove or a hollow groove of a roller, and a swing arm is used to touch one of the tooth-shaped surfaces to generate different step feelings when the roller rotates; or, for example, taiwan patent publication No. M498914, proposes a jog wheel structure of a mouse, in which a tooth portion and a resisting rod are disposed in a wheel device, and the resisting rod is elastically supported by a torsion spring to abut on the tooth portion, and a user can operate a button member linked with the resisting rod to switch the wheel between a fast jog mode or a normal jog mode.

However, most of the shuttle shuttles in the aforementioned technologies are designed by using an inertia principle and matching with a mechanism, the rolling effect is limited, only several preset roller modes are provided for users to switch, and consumers cannot adjust the roller modes according to their needs or preferences, so that consumers may spend more time to find a mouse suitable for their own use, and the use of an inappropriate mouse device may reduce the working efficiency. Therefore, how to improve the above problems is the focus of attention of those skilled in the art.

Disclosure of Invention

One objective of the present invention is to provide a mouse roller device, which senses the magnetic pole of a ring-shaped magnet in a roller through a sensing unit, controls an electromagnet to generate a magnetic pole in the same direction or opposite direction as the ring-shaped magnet according to the magnetic pole of the ring-shaped magnet, so as to enhance or weaken the rolling effect of the roller, thereby achieving the technical effect of adjusting the rotation speed of the roller.

Other objects and advantages of the present invention will be further understood from the technical features disclosed in the present invention.

In order to achieve one or a part of or all of the above or other objects, the present invention provides a mouse wheel device, which includes a wheel, a sensing unit, an electromagnet and a control unit. The roller comprises a ring-shaped magnet and a rotating shaft extending along a first direction. The roller drives the ring magnet to rotate along the rotating shaft in response to the external force. The sensing unit is adjacent to the roller and used for sensing the magnetic pole of the ring-shaped magnet. The roller is located between the electromagnet and the sensing unit, and the electromagnet is used for providing magnetic force to the annular magnet of the roller. The control unit is electrically connected with the sensing unit and the electromagnet. The control unit controls the electromagnet to provide magnetic force to the annular magnet of the roller according to the magnetic poles of the annular magnet sensed by the sensing unit.

The mouse roller device of the embodiment senses the magnetic pole of the annular magnet in the roller shell through the sensing unit, so that the control unit controls the electromagnet to generate the magnetic pole which is in the same direction or opposite to the magnetic pole of the annular magnet according to the magnetic pole of the annular magnet sensed by the sensing unit.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

FIG. 1 is a schematic structural diagram of a mouse wheel device in an operating state according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of the mouse wheel device shown in FIG. 1 in another use state;

FIG. 3 is a schematic structural diagram of a mouse wheel device in a use state according to another embodiment of the present invention;

FIG. 4 is a schematic structural diagram of the mouse wheel device shown in FIG. 3 at different time points;

FIG. 5 is a schematic structural diagram of the mouse wheel device shown in FIG. 3 in another use state;

FIG. 6 is a schematic structural diagram of the mouse wheel device shown in FIG. 5 at different time points;

FIG. 7 is a schematic structural diagram of the mouse wheel device shown in FIG. 3 in another use state;

FIG. 8 is a schematic structural diagram of the mouse wheel device shown in FIG. 7 at different time points;

FIG. 9 is a schematic structural diagram of a mouse wheel device according to another embodiment of the present invention.

Description of reference numerals:

1. 1a, 1 b: mouse roller device

11. 11 a: roller wheel

12: sensing unit

13: electromagnet

14: control unit

15: pulse width modulation unit

110: shell body

111. 111 a: ring-shaped magnet

112: rotating shaft

D1: a first direction

D2: second direction

D3: third direction

P1: the first part

P2: the second part

S1: direction of rotation

Detailed Description

Referring to fig. 1 and 2, fig. 1 is a schematic structural diagram of a mouse wheel device in a use state according to an embodiment of the present invention. FIG. 2 is a schematic structural diagram of the mouse wheel device shown in FIG. 1 in another use state. As shown in fig. 1 and 2, the mouse wheel device 1 of the present embodiment includes a wheel 11, a sensing unit 12, an electromagnet 13, and a control unit 14. The wheel 11 includes a ring magnet 111 and a rotating shaft 112 extending along a first direction D1, and more specifically, the wheel 11 further includes a housing 110, the ring magnet 111 and the rotating shaft 112 are disposed in the housing 110, and a portion of the rotating shaft 112 is exposed outside the housing 110 and connected to other components (not shown) inside the mouse, the housing 110 of the wheel 11 drives the ring magnet 111 to rotate along the rotating shaft 112 in response to an external force, in this embodiment, the wheel 11 rotates in a clockwise direction S1, in other embodiments, the wheel 11 can also rotate in a counterclockwise direction, and the ring magnet 111 is a permanent magnet, but the invention is not limited thereto. The sensing unit 12 is adjacent to the roller 11, and the sensing unit 12 is used for sensing the magnetic poles of the ring-shaped magnet 111 located in the housing 110 of the roller 11, in the embodiment, the sensing unit 12 is, for example, a hall sensor, and the sensing unit 12 is located below the roller 11, and when the roller 11 rotates in response to an external force, the sensing unit 12 senses the magnetic poles passing through the upper portion of the ring-shaped magnet 111, but the invention is not limited to the configuration position of the sensing unit 12. The roller 11 is disposed between the electromagnet 13 and the sensing unit 12, and the electromagnet 13 is configured to generate a magnetic force with the ring-shaped magnet 111 disposed in the roller 11. The control unit 14 is electrically connected to the sensing unit 12 and the electromagnet 13, and the control unit 14 controls the electromagnet 13 and the ring magnet 111 of the roller 11 to generate a magnetic force according to the magnetic poles of the ring magnet 111 sensed by the sensing unit 12.

The detailed structure and operation of the mouse wheel device 1 according to the embodiment of the present invention will be further described below.

As shown in fig. 1, in the present embodiment, the magnetic pole of the ring magnet 111 located in the housing 110 of the roller 11 is, for example, an N pole. In a use state, a user intends to enhance the rolling effect of the wheel 11 and send an instruction to the mouse wheel device 1, at this time, the control unit 14 sends a control signal to the electromagnet 13 according to the sensing of the sensing unit 12 that the magnetic pole of the ring-shaped magnet 111 is N-pole, and controls the electromagnet 13 to generate a magnetic pole in the same direction as the magnetic pole of the ring-shaped magnet 111, that is, the electromagnet 13 generates a magnetic pole of N-pole, and according to the principle that like poles repel each other, a magnetic force facing the second direction D2 is generated between the electromagnet 13 and the ring-shaped magnet 111, that is, a magnetic repulsion force is generated between the electromagnet 13 and the ring-shaped magnet 111. The second direction D2 (the direction of the magnetic force) and the first direction D1 (the extending direction of the rotating shaft 112) are not parallel to each other, in the embodiment, the second direction D2 and the first direction D1 are, for example, perpendicular to each other, but the invention is not limited thereto, and when the second direction D2 and the first direction D1 are perpendicular to each other, the magnetic force generated between the electromagnet 13 and the ring-shaped magnet 111 can smoothly act on the roller 11, so as to accelerate the roller 11, and further, since the magnetic force generated between the electromagnet 13 and the ring-shaped magnet 111 is a magnetic repulsion force, the second direction D2 (the direction of the magnetic force) and the rotating direction S1 of the roller 11 are the same, so that the ring-shaped magnet 111 is accelerated by the magnetic repulsion force, and the rotating speed of the roller 11 is increased.

As shown in fig. 2, in another use state, when the user intends to weaken the rolling effect of the wheel 11 and issues an instruction to the mouse wheel device 1, the control unit 14 sends a control signal to the electromagnet 13 according to the sensing of the sensing unit 12 that the magnetic pole of the ring-shaped magnet 111 is N-pole, and then controls the electromagnet 13 to generate a magnetic pole opposite to the magnetic pole of the ring-shaped magnet 111, that is, a magnetic pole of S-pole is generated by the electromagnet 13, and according to the principle that opposite poles attract each other, a magnetic force facing the third direction D3 is generated between the electromagnet 13 and the ring-shaped magnet 111, that is, a magnetic attraction force is generated between the electromagnet 13 and the ring-shaped magnet 111. The third direction D3 (the direction of the magnetic force) and the first direction D1 (the extending direction of the rotating shaft 112) are not parallel to each other, and in this embodiment, the third direction D3 and the first direction D1 are, for example, perpendicular to each other, but the invention is not limited thereto, and when the third direction D3 and the first direction D1 are perpendicular to each other, the magnetic force generated between the electromagnet 13 and the ring-shaped magnet 111 can smoothly act on the roller 11, so as to decelerate the roller 11, and further, since the magnetic force generated between the electromagnet 13 and the ring-shaped magnet 111 is a magnetic attraction force, the third direction D3 (the direction of the magnetic force) and the rotating direction S1 of the roller 11 are opposite to each other, so that the ring-shaped magnet 111 is pulled by the magnetic attraction force to decelerate, and at the same time, the rotating speed of the roller 11 is reduced.

As can be seen from the above, the mouse wheel device 1 of the present embodiment senses the magnetic pole of the ring-shaped magnet 111 located in the housing 110 of the wheel 11 through the sensing unit 12, so that the control unit 14 controls the electromagnet 13 to generate a magnetic pole in the same direction or opposite direction as the magnetic pole of the ring-shaped magnet 111 according to the magnetic pole of the ring-shaped magnet 111 sensed by the sensing unit 12, and in such a design, a user can adjust the rotation effect of the wheel 11 according to the actual requirement, that is, increase the rotation speed of the wheel 11 or decrease the rotation speed of the wheel 11, thereby improving the flexibility and hand feeling of the user when operating the wheel device.

Referring to fig. 3 to 8, fig. 3 is a schematic structural diagram of a mouse wheel device in a use state according to another embodiment of the present invention. FIG. 4 is a schematic structural diagram of the mouse wheel device shown in FIG. 3 at different time points. FIG. 5 is a schematic structural diagram of the mouse wheel device shown in FIG. 3 in another use state. FIG. 6 is a schematic structural diagram of the mouse wheel device shown in FIG. 5 at different time points. FIG. 7 is a schematic structural diagram of the mouse wheel device shown in FIG. 3 in another use state. FIG. 8 is a schematic structural diagram of the mouse wheel device shown in FIG. 7 at different time points. As shown in fig. 3 to 8, the mouse wheel device 1a of the present embodiment is similar to the mouse wheel device 1 shown in fig. 1 and 2, except that the ring-shaped magnet 111a of the wheel 11a of the present embodiment includes a first portion P1 and a second portion P2, and the magnetic poles of the first portion P1 and the second portion P2 of the ring-shaped magnet 111a are different from each other, in the present embodiment, the magnetic pole of the first portion P1 is, for example, an N pole, and the magnetic pole of the second portion is, for example, an S pole.

As shown in fig. 3 and 4, in a use state of the mouse wheel device 1a of the present embodiment, a user intends to enhance the rolling effect of the wheel 11a and issues an instruction to the mouse wheel device 1a, as shown in fig. 3, the control unit 14 sends a control signal to the electromagnet 13 according to the fact that the sensing unit 12 senses that the first part P1 of the ring-shaped magnet 111a is N-pole at a first time point, and controls the electromagnet 13 to generate a magnetic pole in the same direction as the first part P1 of the ring-shaped magnet 111a, that is, the electromagnet 13 generates a magnetic pole of N-pole, according to the principle that the same pole is repelled, a magnetic force facing the second direction D2 is generated between the electromagnet 13 and the first part P1 of the ring-shaped magnet 111a, that is, a magnetic repulsion force is generated between the electromagnet 13 and the first part P1 of the ring-shaped magnet 111 a. As shown in fig. 4, when the roller 11a continuously rotates to make the second portion P2 located within the sensing range of the sensing unit 12 for being sensed, the control unit 14 sends a control signal to the electromagnet 13 and controls the electromagnet 13 to generate a magnetic pole having the same direction as the magnetic pole of the second portion P2 of the ring magnet 111a, i.e., a magnetic pole of S-pole, when the sensing unit 12 senses that the magnetic pole of the second portion P2 of the ring magnet 111a is S-pole at the second time point, according to the principle that the same poles repel each other, a magnetic force heading to the second direction D2 is generated between the electromagnet 13 and the second portion P2 of the ring magnet 111a, i.e., a magnetic repulsion force is generated between the electromagnet 13 and the second portion P2 of the ring magnet 111 a. The second direction D2 (the direction of the magnetic force) and the first direction D1 (the extending direction of the rotating shaft 112) are not parallel to each other, in the embodiment, the second direction D2 and the first direction D1 are perpendicular to each other, for example, but the invention is not limited thereto, in the case where the second direction D2 and the first direction D1 are perpendicular to each other, the magnetic force generated between the electromagnet 13 and the first portion P1 and the second portion P2 of the ring-shaped magnet 111a can be smoothly applied to the roller 11a, thereby accelerating the roller 11a, and further, since the magnetic force generated between the electromagnet 13 and the first and second portions P1 and P2 of the ring type magnet 111a is a magnetic repulsive force, therefore, the second direction D2 (the direction of the magnetic force) and the rotating direction S1 of the roller 11a are identical to each other, so that the first portion P1 and the second portion P2 of the ring magnet 111a are accelerated by the repulsive magnetic force, and the rotation speed of the roller 11a is increased.

As shown in fig. 5 and 6, in another using state of the mouse wheel device 1a of the present embodiment, when the user intends to weaken the rolling effect of the wheel 11a and issues a command to the mouse wheel device 1a, as shown in fig. 5, the control unit 14 sends a control signal to the electromagnet 13 according to the fact that the sensing unit 12 senses that the magnetic pole of the first portion P1 of the ring-shaped magnet 111a is N-pole at the first time point, and controls the electromagnet 13 to generate a magnetic pole opposite to the magnetic pole of the first portion P1 of the ring-shaped magnet 111a, that is, the electromagnet 13 generates a magnetic pole of S-pole, according to the principle that the opposite poles attract each other, a magnetic force facing the third direction D3 is generated between the electromagnet 13 and the ring-shaped magnet 111a, that is, a magnetic attraction force is generated between the electromagnet 13 and the first portion P1 of. As shown in fig. 6, when the roller 11a continuously rotates to make the second portion P2 located within the sensing range of the sensing unit 12 for being sensed, the control unit 14 sends a control signal to the electromagnet 13 and controls the electromagnet 13 to generate a magnetic pole opposite to the magnetic pole of the second portion P2 of the ring magnet 111a, i.e. a magnetic pole of N pole, according to the sensing unit 12 sensing that the magnetic pole of the second portion P2 of the ring magnet 111a is S pole at the second time point, according to the principle that opposite poles attract each other, a magnetic force heading to the third direction D3 is generated between the electromagnet 13 and the second portion P2 of the ring magnet 111a, i.e. a magnetic attraction force is generated between the electromagnet 13 and the second portion P2 of the ring magnet 111 a. The third direction D3 (the direction of the magnetic force) and the first direction D1 (the extending direction of the rotating shaft 112) are not parallel to each other, in the embodiment, the third direction D3 and the first direction D1 are perpendicular to each other, for example, but the invention is not limited thereto, in the case where the third direction D3 and the first direction D1 are perpendicular to each other, the magnetic force generated between the electromagnet 13 and the first portion P1 and the second portion P2 of the ring-shaped magnet 111a can be smoothly applied to the roller 11a, thereby decelerating the roller 11a, and further, since the magnetic force generated between the electromagnet 13 and the first and second portions P1 and P2 of the ring magnet 111a is a magnetic attraction force, therefore, the third direction D3 (the direction of the magnetic force) and the rotating direction S1 of the roller 11a are opposite to each other, the ring magnet 111a is pulled by the magnetic attraction to be decelerated, and the rotation speed of the roller 11a is reduced.

As shown in fig. 7 and 8, in another use state of the mouse wheel device 1a of the present embodiment, as shown in fig. 7, the control unit 14 sends a control signal to the electromagnet 13 according to the sensing of the sensing unit 12 that the magnetic pole of the first portion P1 of the ring-shaped magnet 111a is N-polar at the first time point, and controls the electromagnet 13 to generate a magnetic pole in the same direction as the magnetic pole of the ring-shaped magnet 111a, that is, to generate a magnetic pole of N-polar for the electromagnet 13, and according to the principle that the same poles repel each other, a magnetic force facing the second direction D2 is generated between the electromagnet 13 and the first portion P1 of the ring-shaped magnet 111a, that is, a magnetic repulsion force is generated between the electromagnet 13 and the first portion P1 of the ring-shaped. As shown in fig. 8, when the roller 11a continuously rotates to make the second portion P2 located within the sensing range of the sensing unit 12 for being sensed, and the control unit 14 senses that the second portion P2 of the ring magnet 111a is S-pole at the second time point according to the sensing unit 12, the control unit 14 sends a control signal to the electromagnet 13 and controls the electromagnet 13 to generate a magnetic pole opposite to the magnetic pole of the ring magnet 111a, that is, to generate N-pole magnetic pole of the electromagnet 13, and according to the principle that opposite poles attract each other, a magnetic force is generated between the electromagnet 13 and the second portion P2 of the ring magnet 111a in the third direction D3, that is, a magnetic attraction force is generated between the electromagnet 13 and the second portion P2 of the ring magnet 111 a. In this embodiment, since the magnetic force generated between the electromagnet 13 and the first portion P1 of the ring-shaped magnet 111a is a magnetic repulsive force, and the magnetic force generated between the electromagnet 13 and the second portion P2 of the ring-shaped magnet 111a is a magnetic attractive force, the rolling effect of accelerating and decelerating the roller 11a can be achieved in the same use state, thereby adjusting the rotation speed of the roller 11a to a desired rotation speed between a high rotation speed and a low rotation speed. It should be noted that, in the case that the magnetic pole of the first portion P1 of the ring magnet 111a is N-pole, the control unit 14 may control the electromagnet 13 to generate a magnetic pole opposite to the magnetic pole of the first portion P1 of the ring magnet 111a, i.e., to generate S-pole for the electromagnet 13, and in the case that the magnetic pole of the second portion P2 of the ring magnet 111a is S-pole, the control unit 14 may control the electromagnet 13 to generate a magnetic pole opposite to the magnetic pole of the second portion P2 of the ring magnet 111a, i.e., to generate S-pole for the electromagnet 13.

Please refer to fig. 9, which is a schematic structural diagram of a mouse wheel device according to another embodiment of the present invention. As shown in fig. 9, the mouse wheel device 1b of the present embodiment is similar to the mouse wheel device 1 shown in fig. 1 and 2, and the difference is that the mouse wheel device 1b of the present embodiment further includes a pulse width modulation unit 15. The pulse width modulation unit 15 of the present embodiment is electrically connected between the control unit 14 and the electromagnet 13. The control unit 14 sends a control signal to the pulse width modulation unit 15 according to the magnetic pole of the ring magnet 111 sensed by the sensing unit 12, and the pulse width modulation unit 15 sends a pulse width modulation signal to the electromagnet according to the control signal generated by the control unit 14, so as to adjust the strength of the magnetic force provided by the electromagnet, that is, the pulse width modulation unit 15 can send pulse width modulation signals corresponding to various different magnetic strengths according to an instruction sent by a user to increase or decrease the strength of the magnetic force generated by the electromagnet 13, thereby further regulating and controlling the rotation speed of the roller 11 in the use state shown in fig. 1 to 8.

In summary, the mouse wheel device of the present embodiment senses the magnetic pole of the ring-shaped magnet located in the wheel housing through the sensing unit, so that the control unit controls the electromagnet to generate a magnetic pole in the same direction or opposite direction as the magnetic pole of the ring-shaped magnet according to the magnetic pole of the ring-shaped magnet sensed by the sensing unit.

While the invention has been described with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Furthermore, it is not necessary for any embodiment or claim of the invention to achieve all of the objects or advantages or features disclosed herein. In addition, the abstract section and the title are provided for assisting the search of patent documents and are not intended to limit the claims of the present invention. Furthermore, the terms "first," "second," and the like in the description or in the claims are used only for naming elements (elements) or distinguishing different embodiments or ranges, and are not used for limiting the upper limit or the lower limit on the number of elements.

Claims

1. A mouse wheel device, comprising:

the roller comprises a ring-shaped magnet and a rotating shaft extending along a first direction, and the roller drives the ring-shaped magnet to rotate along the rotating shaft in response to external force;

a sensing unit adjacent to the roller for sensing the magnetic pole of the ring-shaped magnet;

the roller is positioned between the electromagnet and the sensing unit, and the electromagnet is used for generating a magnetic force with the annular magnet of the roller; and

and the control unit is electrically connected with the sensing unit and the electromagnet and controls the magnetic force generated between the electromagnet and the annular magnet of the roller according to the magnetic poles of the annular magnet sensed by the sensing unit.

2. The mouse wheel device of claim 1, wherein the control unit controls the electromagnet to generate a magnetic pole in a same direction according to the magnetic pole of the ring-shaped magnet sensed by the sensing unit, such that the magnetic force is generated between the electromagnet and the ring-shaped magnet in a second direction, the second direction is not parallel to the first direction, and the second direction is the same as the rotation direction of the wheel.

3. The mouse wheel device of claim 1, wherein the control unit controls the electromagnet to generate a reverse magnetic pole according to the magnetic pole of the ring-shaped magnet sensed by the sensing unit, such that the magnetic force is generated between the electromagnet and the ring-shaped magnet in a third direction, the third direction is not parallel to the first direction, and the third direction is opposite to the rotation direction of the wheel.

4. The mouse wheel device of claim 1, wherein the ring-shaped magnet includes a first portion and a second portion, the magnetic poles of the first part and the second part are different, the control unit controls the electromagnet to generate a first homopolar magnetic pole according to the magnetic pole of the first part of the ring-shaped magnet sensed by the sensing unit at a first time point, so that the magnetic force facing a second direction is generated between the electromagnet and the first portion of the ring-shaped magnet, the control unit controls the electromagnet to generate a second equidirectional magnetic pole according to the magnetic pole of the second part of the ring-shaped magnet sensed by the sensing unit at a second time point, so that the magnetic force facing the second direction is generated between the electromagnet and the second portion of the ring-shaped magnet, the second direction is not parallel to the first direction, and the second direction is the same as the rotation direction of the roller.

5. The mouse wheel device of claim 1, wherein the ring-shaped magnet includes a first portion and a second portion, the magnetic poles of the first part and the second part are different, the control unit controls the electromagnet to generate a first reverse magnetic pole according to the magnetic pole of the first part of the ring-shaped magnet sensed by the sensing unit at a first time point, so that the magnetic force facing a third direction is generated between the electromagnet and the first portion of the ring-shaped magnet, the control unit senses the magnetic pole of the second part of the ring magnet at a second time point according to the sensing unit, further controlling the electromagnet to generate a second opposite magnetic pole, so that the magnetic force facing the third direction is generated between the electromagnet and the second portion of the ring-shaped magnet, the third direction is not parallel to the first direction, and the third direction is opposite to the rotation direction of the roller.

6. The mouse wheel device of claim 1, wherein the ring magnet includes a first portion and a second portion, the first portion and the second portion have different magnetic poles, the control unit controls the electromagnet to generate a magnetic pole in a same direction according to the magnetic pole of the first portion of the ring magnet sensed by the sensing unit at a first time point, such that the magnetic force facing a second direction is generated between the electromagnet and the first portion of the ring magnet, the second direction is not parallel to the first direction, and the second direction is the same as the rotation direction of the wheel, the control unit controls the electromagnet to generate a magnetic pole in a reverse direction according to the magnetic pole of the second portion of the ring magnet sensed by the sensing unit at a second time point, such that the magnetic force facing a third direction is generated between the electromagnet and the second portion of the ring magnet, the third direction is not parallel to the first direction, the third direction is opposite to the rotation direction of the roller, and the third direction is opposite to the second direction.

7. The mouse wheel device of claim 1, further comprising a pulse width modulation unit electrically connected to the control unit and the electromagnet, wherein the control unit sends a control signal to the pulse width modulation unit according to the magnetic pole of the ring-shaped magnet sensed by the sensing unit, and the pulse width modulation unit sends a pulse width modulation signal to the electromagnet according to the control signal, thereby adjusting the intensity of the magnetic force provided by the electromagnet.

8. The mouse wheel device of claim 1, wherein the ring-shaped magnet of the wheel is a permanent magnet.

9. The mouse wheel device of claim 1, wherein the sensing unit is a hall sensor.