KR20220015006A - Vibration generating device - Google Patents

Abstract

A vibration generating device is provided. The vibration generating device according to some embodiments of the present invention includes: a case which forms an internal space; a first coil and a second coil which are disposed to be adjacent to an upper surface and a lower surface of the case, respectively, in a first direction thereof; a permanent magnet which is disposed between the first and second coils to be separated from the first and second coils in the first direction, includes a protruding region extended over the first and second coils in a second direction perpendicular to the first direction, wherein the second direction is the direction of long sides of the first and second coils, and the permanent magnet vibrates in a third direction perpendicular to the first and second directions based on magnetic interaction with the first and second coils; and a plurality of sliding elastic bodies which include a first surface fixed to an upper surface or a lower surface of the protruding region, and a second surface fixed to the case.

Description

Vibration generating device {VIBRATION GENERATING DEVICE}

The present invention relates to a vibration generating device, and more particularly, it includes a permanent magnet (oscillator) having a protruding region extending from a coil (stator), and a sliding elastic body is connected to the protruding region to generate stress applied to the case It relates to a vibration generating device that minimizes.

In general, with the recent development of communication technology, the spread of smartphones, tablets, and game consoles has become common. Due to the miniaturization of these devices, it is easy to carry as well as input/output of voice and data anytime, anywhere, and accordingly, it has become an essential portable product. is hardening

In addition, these days, the vibration function has become essential as a public etiquette, and it vibrates when an impact is applied, such as when inputting data such as a phone number with a touch type, or when shooting a gun or hitting a ball in mobile games such as shooting and sports. It also provides a function that allows gamers to play the game more realistically.

In addition, with the recent trend of increasing the adoption of electronic devices in automobiles and the adoption of touch panel-type screens, the adoption of vibration generators is expanding to deliver lane departure warning signals to automobiles or to deliver haptic sensations in touch devices. In this case, a motor that generates vibration is usually employed, but as the vibration function is used in such a variety of cases, the frequency of use of the vibration generator has increased. demand is increasing.

1 is a view for explaining a conventional rotary vibration generator. A conventional rotary vibration generator is largely composed of a stator, which is a fixed member, and a rotor, which is a rotating member. Since such a rotor drives the winding coil 30, the weight 12, etc. to one side, the center of gravity is eccentric than the center of rotation, and vibration is accompanied during rotation. This brush-type vibration generator changes the direction of current by the sliding contact of the brush 7a. There was a disadvantage in that the response was slow due to the inertia at the time of overheating and stopping.

As a solution to this problem, linear vibration generators without electrical contacts accompanied by wear and tear appear.

2A and 2B are diagrams for explaining a conventional linear vibration generator. In the conventional linear vibration generator, a spring 220 is disposed inside a case 212 , and a magnetic field by a yoke 241 , a permanent magnet 242 , and a flat yoke 243 coupled to the spring 220 . ) occurs. A coil 230 is disposed in the generated magnetic field, and one end of the coil 230 is fixed to the inner upper surface of the base 211 . In such a vibration generator, the direction of the magnetic field and the direction of the current flowing along the coil 230 are perpendicular to each other. The oscillators 241 , 242 , 243 made of magnetic field forming parts supported by the spring 220 are moved in the direction, that is, either downward or upward in FIG. 2A . If the direction of the current applied to the coil 230 is continuously changed, the vibrator continuously generates vertical vibrations. Unlike a rotary vibration generator, such a linear vibration generator has no sliding contact, so durability can be improved.

In addition, such a linear vibration generator can have a structure capable of obtaining vibration in a desired frequency band by generating maximum displacement using resonance, breaking away from the conventional method for obtaining vibration in a brush-type vibration motor. . Here, the resonance frequency (fn) is affected by the mass (m) of the vibrator and the spring constant (k) as shown in Equation 1 below.

However, in the conventional vibration generator shown in FIGS. 2A and 2B , since the vibrator has a structure in which the vibrator moves up and down, free space for up and down vibration is required, and the case 212 and the base 211 which are the stators constituting the outer periphery. A gap is required not to collide with the surface, and in this case, there is a limit to manufacturing thin and thin.

3 is a view for explaining a conventional horizontal direction linear vibration generator. Referring to FIG. 3 , as a countermeasure to the above problem, a permanent magnet 410 , a yoke 420 , and a weight 430 are used to form a vibrator, and a coil 3200 is attached to the base 1000 and a substrate 3100 attached to the base 1000 . ) to form a lower stator, the side of the case 2000 serving as a side and upper stator and the vibrator are connected with a spring 6000, and when a current is applied to the coil 3200 of the stator, the vibrator connected to the spring A structure that vibrates horizontally left and right is presented.

The conventional horizontal vibration generator shown in FIG. 3 makes the external shape rectangular and vibrates in the right-angled direction of the thickness, that is, in the horizontal left-right direction, and is made thinner than the linear vibration generator in the thickness direction described above with reference to FIGS. 2A and 2B. However, there is a problem that needs to be solved in contrast to the vertical vibration structure.

That is, the vertical vibration generator of FIG. 2A or the horizontal vibration motors of FIG. 3 typically use a permanent magnet through which magnetic flux flows in the thickness direction of the vibration generator. The area of the permanent magnet increases relatively significantly. Accordingly, when the upper case or the lower base is designed with a non-magnetic material, the leakage magnetic flux of the permanent magnet to the upper or lower portion increases, which may adversely affect nearby electronic devices.

In addition, if the yoke 420, the lower base 1000, and/or the case 2000 of FIG. 3 is designed with a magnetic material to reduce the leakage magnetic flux, the suction force between the permanent magnet 410 and the magnetic material increases as the area to face is increased. In particular, in the case of the vertical asymmetric structure as shown in FIG. 3 , a force that the vibrator is pulled toward one of the upper and lower sides of the stator is greatly generated, and in severe cases, a touch noise is generated.

In addition, even if it is designed so that a touch does not occur by adding an extra space, the vertical stress on the spring 6000 increases, thereby increasing the repetitive fatigue load, and eventually shortening the fracture life of the spring. In fact, despite the advantage of making it thinner than the vertical vibration type linear vibration generator, the magnetic leakage problem cannot be solved because a large number of non-magnetic stator parts are employed due to the structure with a large attraction force between the permanent magnet and the magnetic stator. It also causes deterioration of (GPS) characteristics, so it is not often used in electronic devices such as high-end mobile phones that are sensitive to leakage magnetism.

The technical problem to be solved by the present invention is to provide a vibration generating device capable of being manufactured in a thin shape by generating horizontal vibration.

In addition, the technical problem to be solved by the present invention is to provide a vibration generating device for suppressing the generation of touch noise by symmetrically arranging the coil on the axis of the permanent magnet.

In addition, the technical problem to be solved by the present invention is to provide a vibration generating device that minimizes vertical stress by arranging a sliding elastic body in a protruding region of a permanent magnet that is formed to extend beyond a coil.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the description below.

Vibration generating device according to some embodiments of the present invention for achieving the above technical problem, a case forming an inner space, a first coil and a second coil disposed adjacent to the upper surface and the lower surface in a first direction of the case, respectively , disposed between the first and second coils and spaced apart from the first and second coils in the first direction, the first and second coils in a second direction perpendicular to the first direction and in the direction of long sides of the first and second coils The upper surface or lower surface of the permanent magnet and the protruding area including a protruding area extending from the second coil and vibrating in a third direction perpendicular to the first and second directions based on magnetic interaction with the first and second coils It may include a plurality of sliding elastic bodies including a first surface fixed to the case and a second surface fixed to the case.

According to some embodiments, the case includes first and second cases, wherein the first case includes an upper surface portion in a first direction and first and second side portions facing each other in a third direction, and the second case may include a lower surface portion in the first direction, and third and fourth side portions facing each other in the second direction, and the lower surface portion may include a region protruding from the interior space and connected to the outside.

According to some embodiments, a substrate connected to the first and second coils and supplying current supplied from the outside to the first and second coils may be further included.

According to some embodiments, the substrate includes a U-shaped region including a first region in contact with the upper surface of the first coil, a second region in contact with the lower surface of the second coil, and a third region connecting the first region and the second region. may be of the form.

Vibration generating device according to some embodiments of the present invention for achieving the above technical problem, a case forming an internal space, a coil disposed adjacent to a lower surface of the case in a first direction, and spaced apart from the coil in the first direction a third direction perpendicular to the first direction and extending beyond the coil in a second direction that is a direction of a long side of the coil, the third direction being perpendicular to the first and second directions based on a magnetic interaction with the coil A permanent magnet vibrating in the direction is fixed to the opposite side of the side opposite to the coil of the permanent magnet, and the yoke formed shorter in the second direction than the permanent magnet and the first surface fixed to the upper surface or the lower surface of the protruding area and the case fixed to the case It may include a plurality of sliding elastic body including the second surface.

According to some embodiments, the yoke may be disposed to be spaced apart from the case in the first direction.

According to some embodiments, the case includes first and second cases, wherein the first case includes an upper surface portion in a first direction and first and second side portions facing each other in a third direction, and the second case may include a lower surface portion in the first direction, and third and fourth side portions facing each other in the second direction, and the lower surface portion may include a region protruding from the interior space and connected to the outside.

According to some embodiments, a substrate connected to the coil and supplying a current supplied from the outside to the coil may further include.

According to some embodiments, the substrate may be configured in a planar shape in contact with the lower surface of the coil.

The details of other embodiments are included in the detailed description and drawings.

1 is a view for explaining a conventional rotary vibration generator.
2A and 2B are diagrams for explaining a conventional linear vibration generator.
3 is a view for explaining a conventional horizontal direction linear vibration generator.
4A and 4B are perspective views for explaining a vibration generating device according to some embodiments of the present invention.
5 is an exploded perspective view for explaining a vibration generating device according to some embodiments of the present invention.
6 is a cross-sectional view taken along line AB of FIG. 4A.
7A to 7C are diagrams for explaining a vibration operation of a vibration generating device according to some embodiments of the present invention.
8 is an exploded perspective view for explaining a vibration generating device according to some embodiments of the present invention.
9 is a cross-sectional view taken along line AB of FIG. 4A.

Hereinafter, a vibration generating device according to some embodiments of the present invention will be described with reference to FIGS. 4A to 9 .

4A and 4B are perspective views illustrating a vibration generating device according to some embodiments of the present invention, and FIG. 5 is an exploded perspective view illustrating a vibration generating device according to some embodiments of the present invention.

4A, 4B and 5 , the vibration generating device 10 according to some embodiments of the present invention includes a case 100 , a substrate 200 , two coils 310 and 320 , and a permanent magnet 400 . ) and a sliding elastic body 600 may be included.

The case 100 may include a first case 110 and a second case 130 . The first case 110 and the second case 130 may be combined to form an internal space. According to some embodiments, the case 100 may be made of a magnetic material. Accordingly, the efficiency of the vibration generating device 10 is increased, and deterioration of the characteristics of the external electronic component caused by the leakage magnetic component can be prevented.

The substrate 200 may be disposed adjacent to the upper surface, the lower surface, and one side of the case 100 . The substrate 200 may supply current supplied from the outside to the first coil 310 and the second coil 320 . According to some embodiments, the substrate 200 has a first region in contact with an upper surface of the first coil 310 in the first direction D1 and a lower surface of the second coil 320 in the first direction D1 . It may include a second region in contact with and a third region connecting the first region and the second region. According to some embodiments, the first area (top surface) of the substrate 200 is attached to the first case 110 , the second area (lower surface) is attached to the second case 130 , and the third area (side surface) of the substrate 200 . ) may be disposed at a predetermined distance from the case 100 .

The first coil 310 and the second coil 320 may be respectively disposed adjacent to the first case 110 and the second case 130 to be implemented as a stator of the vibration generating device 10 . Specifically, the first coil 310 is fixed to the first case 110 by being in contact with the upper surface of the substrate 200 , and the second coil 320 is in contact with the lower surface of the substrate 200 by contacting the second case 130 . ) is fixed to The first coil 310 and the second coil 320 may receive an external current through the substrate 200 and generate an ambient magnetic field based thereon.

The permanent magnet 400 may be disposed between the first coil 310 and the second coil 320 and spaced apart from each of the first coil 310 and the second coil 320 . According to some embodiments, the permanent magnet 400 may be implemented as a vibrator vibrating in the third direction D3 based on a magnetic interaction with the first coil 310 and the second coil 320 . The vibration operation of the permanent magnet 400 will be described later.

The sliding elastic body 600 may be fixedly attached to both upper and lower surfaces of the permanent magnet 400 in the second direction D2 . Specifically, it may be implemented with four sliding elastic bodies 600 fixed to both upper and lower sides of the permanent magnet 400 . In addition, one surface of each sliding elastic body 600 may be fixedly attached to the case 100 . As shown, the sliding elastic body 600 fixed to the upper surface of the permanent magnet 400 is fixed to the first case 110, and the sliding elastic body 600 fixed to the lower surface of the permanent magnet 400 is the second case ( 130) can be fixed. According to some embodiments, the sliding elastic body 600 may be implemented with all kinds of materials that can elastically support the vibrator.

6 is a cross-sectional view taken along line A-B of FIG. 4A.

Referring to FIG. 6 , the vibration generating device 10 according to some embodiments of the present disclosure includes a protruding region 450 extending in the second direction D2 rather than the first coil 310 and the second coil 320 . It may include a permanent magnet 400 including. Specifically, the second coil 320 , the permanent magnet 400 and the first coil 310 are sequentially spaced apart from each other in the first direction D1 in the inside of the case 100 , and the permanent magnet 400 . A plurality of sliding elastic bodies 600 may be attached to the protrusion region 450 . As shown, the sliding elastic body 600 may be implemented with four components attached to the upper and lower surfaces of each of the two protruding regions 450 .

According to some embodiments, based on the magnetic interaction of the first coil 310 and the second coil 320 and the permanent magnet 400 receiving current through the substrate 200 in the third direction D3 The permanent magnet 400 vibrates. At this time, the permanent magnet 400 may maintain a center position in the first direction D1 by the sliding elastic body 600 attached to both sides of the upper and lower surfaces of the permanent magnet 400 and connected to the case 100 . In addition, it is possible to prevent vibration of the permanent magnet 400 in the first direction D1 due to the sliding elastic body 600 , thereby preventing abrasion of the coils 310 and 320 , the case 100 , and the like.

7A to 7C are diagrams for explaining the vibration operation of the vibration generating device according to some embodiments of the present invention. 7A to 7C are plan views illustrating only the first coil 310 and the permanent magnet 400 as viewed from the upper surface in the first direction D1, and the upper surface of the permanent magnet 400 in the third direction D3 is N Although the pole and the lower surface are illustrated as being magnetized to the S pole, the present invention is not limited thereto and may be magnetized in a polarity opposite to the illustrated polarity.

Referring to FIG. 7A , since the upper portion of the permanent magnet 400 in the third direction D3 is in a state of being magnetized to the N pole, a magnetic field is formed in the exit direction, that is, in the upper direction in the first direction D1, the permanent magnet Since the lower portion of 400 in the third direction D3 is magnetized to the S pole, a magnetic field is formed in the entering direction, that is, in the lower direction of the first direction D1.

The vibration of the vibrator (permanent magnet 400 ) will be described below based on the X and Y regions, and each of the X and Y regions means a specific portion of the first coil 310 .

7A and 7B, a clockwise current is applied to the first coil 310 through the substrate 200. In this case, in the X region and Y region of the first coil 310, Fleming's left hand rule Accordingly, a Lorentz force is generated in the downward direction of the drawing. That is, in the X region, the current flows to the right of the second direction D2 and the magnetic field is formed in the first direction D1, so a Lorentz force is generated downward in the third direction D3, and in the Y region Since a current flows to the left of the second direction D2 and a magnetic field is formed in a direction entering the first direction D1 , a Lorentz force is generated in a downward direction in the third direction D3 as in the X region.

The Lorentz force is a force generated in a conductor through which a current flows, that is, the first coil 310 , and since the first coil 310 is fixed to the substrate 200 and the case 100 , the lower side of the first coil 310 is The permanent magnet 400 moves upward in the third direction D3 by the reaction of the Lorentz force generated in the direction.

At this time, the vibration generating device 10 according to some embodiments of the present invention includes a sliding elastic body 600 attached to the permanent magnet 400, and thus the vibrator (permanent magnet 400) in the third direction ( It is possible to prevent the permanent magnet 400 from vibrating in the first direction D1 when it vibrates in the direction D3).

7A and 7C , a counterclockwise current is applied to the first coil 310 through the substrate 200 , and in this case, Fleming's left hand rule in the X region and Y region of the first coil 310 . A Lorentz force is generated in the upward direction of the drawing. That is, in the X region, the current flows to the left of the second direction D2 and the magnetic field is formed in the first direction D1, so a Lorentz force is generated upward in the third direction D3, and in the Y region Since a current flows to the right of the second direction D2 and a magnetic field is formed in a direction entering the first direction D1 , a Lorentz force is generated in an upward direction in the third direction D3 like the X region.

As described above, the Lorentz force is a force generated in the first coil 310 , and since the first coil 310 is fixed to the substrate 200 and the case 100 , it moves upward of the first coil 310 . The permanent magnet 400 moves downward in the third direction D3 by the reaction of the Lorentz force generated.

8 is an exploded perspective view for explaining a vibration generating device according to some embodiments of the present invention, and FIG. 9 is a cross-sectional view taken along line A-B of FIG. 4A. Hereinafter, in the description of the vibration generating device 20 according to some embodiments of the present invention with reference to FIGS. 8 and 9 , descriptions overlapping those described above with reference to FIGS. 4A to 7C will be omitted and the differences will be mainly focused on differences. Explain.

8 and 9 , the vibration generating device 20 according to some embodiments of the present invention includes a case 100 , a substrate 250 , a third coil 330 , a permanent magnet 400 , and a yoke 500 . ) and a sliding elastic body 600 may be included.

That is, one coil 330 may constitute a stator, and the permanent magnet 400 and the yoke 500 may constitute a vibrator. The yoke 500 is implemented as a magnetic material, and may be implemented as a passage for magnetic flux generated by the permanent magnet 400 . In FIG. 9 , the yoke 500 and the sliding elastic body 600 are shown to be connected to each other, but the present invention is not limited thereto, and the yoke 500 has a shorter length in the second direction D2 and slides with the yoke 500 . The elastic body 600 may be disposed to be spaced apart.

According to some embodiments, the substrate 250 may be implemented in a planar shape. That is, when implemented with one coil 330 , the substrate 250 supplying current to the third coil 330 may be implemented adjacent to only the third coil 330 , in this case, simplifying the process and reducing costs. effect can be obtained.

The vibration operation of the vibration generating device 20 may be implemented similarly to the vibration operation of the vibration generating device 10 described above with reference to FIGS. 7A to 7C . That is, a Lorentz force is generated in the third coil 330 based on the magnetic interaction between the permanent magnet 400 and the third coil 330, and accordingly, the permanent magnet 400, which is a vibrator, moves in the third direction D3. ) can vibrate.

Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments, but may be manufactured in various different forms, and those of ordinary skill in the art to which the present invention pertains. It will be understood by those skilled in the art that the present invention may be embodied in other specific forms without changing the technical spirit or essential features of the present invention. Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

10, 20: vibration generating device 100: case
200, 250: substrate 310, 320, 330: coil
400: permanent magnet 450: protruding area
500: yoke 600: sliding elastic body

Claims (9)

a case defining an interior space;
a first coil and a second coil respectively disposed adjacent to an upper surface and a lower surface of the case in a first direction;
The first and second coils are spaced apart from each other in the first direction between the first and second coils, and in a second direction perpendicular to the first direction and in a direction of long sides of the first and second coils. A permanent magnet including a protruding region extending from the first and second coils, wherein the permanent magnet vibrates in a third direction perpendicular to the first and second directions based on a magnetic interaction with the first and second coils. ; and
and a plurality of sliding elastic bodies including a first surface fixed to an upper surface or a lower surface of the protruding region and a second surface fixed to the case. According to claim 1,
The case includes a first and a second case,
The first case includes an upper surface portion in the first direction, and first and second side portions facing each other in the third direction,
The second case includes a lower surface portion in the first direction, and third and fourth side portions facing each other in the second direction,
The lower surface portion protrudes from the inner space and the vibration generating device including a region connected to the outside. 3. The method according to claim 1 and 2,
and a substrate connected to the first and second coils and configured to supply an external current to the first and second coils. 4. The method of claim 3,
The substrate has a U-shape including a first region in contact with an upper surface of the first coil, a second region in contact with a lower surface of the second coil, and a third region connecting the first region and the second region. Vibration generating device constituted. a case defining an interior space;
a coil disposed adjacent to a lower surface of the case in a first direction;
and a protrusion region disposed to be spaced apart from the coil in the first direction and extending beyond the coil in a second direction perpendicular to the first direction and being a long side of the coil, wherein magnetic interaction with the coil is included. a permanent magnet vibrating in a third direction perpendicular to the first and second directions;
a yoke fixed to the side opposite to the side opposite to the coil of the permanent magnet and formed shorter in the second direction than the permanent magnet; and
and a plurality of sliding elastic bodies including a first surface fixed to an upper surface or a lower surface of the protruding region and a second surface fixed to the case. 6. The method of claim 5,
The yoke is a vibration generating device disposed to be spaced apart from the case in the first direction. 7. The method according to claim 5 and 6,
The case includes a first and a second case,
The first case includes an upper surface portion in the first direction, and first and second side portions facing each other in the third direction,
The second case includes a lower surface portion in the first direction, and third and fourth side portions facing each other in the second direction,
The lower surface portion protrudes from the inner space and the vibration generating device including a region connected to the outside. 6. The method of claim 5,
The vibration generating device further comprising a substrate connected to the coil and supplying a current supplied from the outside to the coil. 9. The method of claim 8,
The substrate is a vibration generating device configured in a planar shape in contact with the lower surface of the coil.

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