CN213601192U - Vibration device - Google Patents

Abstract

The utility model provides a make vibrating device of durability improvement. The vibration device includes: a rectangular flat plate-like vibrating portion; a frame-shaped member surrounding the vibrating portion; a support portion connecting the vibration portion and the frame-shaped member; and a diaphragm that is stretched over the vibrating portion and the frame-shaped member in a state where tension is applied, and vibrates in a planar direction, and corners of the vibrating portion are chamfered.

Description

Vibration device

Technical Field

The utility model relates to a vibrating device for generating vibration.

Background

In recent years, a tactile sensation presenting apparatus has been proposed which causes a user to feel a press operation by transmitting vibration when the user performs the press operation in an input device such as a touch panel.

For example, patent document 1 proposes a tactile indication device that provides tactile feedback to a user using a diaphragm. The diaphragm is deformed in the plane direction by applying a voltage. The vibration portion connected to the diaphragm vibrates in the planar direction by the expansion and contraction of the diaphragm.

Patent document 1: international publication No. 2019/013164

The tactile sensation presentation device may vibrate the vibration portion more largely than in a normal use state due to, for example, an impact caused by dropping. When a large vibration occurs in the vibrating portion, the vibrating portion collides with a member around the vibrating portion. When the vibrating portion collides with a surrounding member, damage such as a dent or a cut may occur to the member surrounding the vibrating portion. When damage occurs to the members around the vibrating portion, the durability of the tactile sensation presentation device is reduced. Therefore, a vibration device having excellent durability without damaging the members around the vibration portion even when the vibration portion vibrates largely is desired.

SUMMERY OF THE UTILITY MODEL

Therefore, an object of the present invention is to provide a vibration device with improved durability.

The utility model discloses a vibrating device's characterized in that possesses: a rectangular flat plate-like vibrating portion; a frame-shaped member surrounding the vibrating portion; a support portion connecting the vibration portion and the frame-shaped member; and a diaphragm that is stretched over the vibrating portion and the frame-shaped member in a state where tension is applied, and vibrates in a planar direction, and corners of the vibrating portion are chamfered.

In this structure, the corners of the vibrating portion are chamfered. The distance between the vibrating portion and the frame-like member is increased by the amount of chamfering. Therefore, when the vibrating portion vibrates, the vibrating portion can be prevented from colliding with the frame-like member. Even when the vibrating portion collides with the frame-like member, the frame-like member is less likely to be damaged at the corner of the vibrating portion than when the frame-like member is not chamfered. Therefore, the vibration device can improve durability.

According to the utility model discloses, can make the durability improve.

Drawings

Fig. 1 (a) is a perspective view of the vibration device 100, and fig. 1 (B) is a cross-sectional view taken along line I-I shown in fig. 1 (a).

Fig. 2 (a) is a perspective view of the vibration unit 10, and fig. 2 (B) is an exploded perspective view of the vibration unit 10.

Fig. 3 (a) is a plan view of the vibration unit 10 in a state where the vibration membrane 12 is not yet deformed, and fig. 3 (B) is a plan view of the vibration unit 10 in a state where the vibration membrane 12 is deformed.

Fig. 4 (a) is a partially enlarged plan view of a region II in fig. 3 (a), and fig. 4 (B) is a partially enlarged plan view of a region III in fig. 3 (a).

Fig. 5 (a) is an enlarged plan view of the periphery of the corner portion 31 in the case where the vibrating portion 14 is largely deformed, and fig. 5 (B) is an enlarged plan view of the periphery of the corner portion 71 in the case where the vibrating portion 74 is largely deformed in the reference example.

Fig. 6 is a graph showing the results of the drop test.

Description of the reference numerals

2 … shell; 10 … vibration unit; 11 … connecting member; 12 … a diaphragm; 14 … a vibrating part; 15 … a support portion; 16 … a frame-like member; 17 … drive circuit; 18 … a first major face; 19 … second major face; 21 … a first opening; 22 … second opening; 31 … corner; 42 … a cushioning material; 43 … a support plate; 44 … double-sided tape; 100 … vibration device; r … radius of curvature (radius of curvature of a curved surface formed at a corner of the vibrating portion); w … width (width of the support portion).

Detailed Description

Fig. 1 (a) is a perspective view of the vibration device 100, and fig. 1 (B) is a cross-sectional view taken along line I-I shown in fig. 1 (a). Fig. 2 (a) is a perspective view of the vibration unit 10, and fig. 2 (B) is an exploded perspective view of the vibration unit 10. Fig. 3 (a) is a plan view of the vibration unit 10 in a state where the vibration membrane 12 is not yet deformed, and fig. 3 (B) is a plan view of the vibration unit 10 in a state where the vibration membrane 12 is deformed. In fig. 1 (a), the other components that pass through the support plate 43 and overlap the support plate 43 are shown by broken lines. Fig. 1 (B) shows a state where the vibration device 100 is provided in the casing 2. Fig. 3 (a) and 3 (B) are broken lines which pass through the diaphragm 12. In each of the drawings other than fig. 1 (B), circuits and wirings are omitted.

As shown in fig. 1 (a) and 1 (B), the vibration device 100 of the present embodiment includes a vibration unit 10, a drive circuit 17, a buffer 42, a support plate 43, and a double-sided tape 44. The vibration unit 10, which will be described in detail later, is connected to the driving circuit 17 by the vibration unit 10.

The vibration device 100 is provided in a housing 2 of an electronic apparatus or the like. The vibration unit 10 is connected to the support plate 43 via a double-sided adhesive tape 44. The support plate 43 is connected to the housing 2 via the cushioning material 42. The cushion material 42 is formed of a material that is more easily deformed when an external force is applied than the case 2 and the vibration unit 10. Therefore, the cushioning material 42 suppresses the binding of the vibration unit 10 to the housing 2.

As shown in fig. 1 (B), 2 (a), 2 (B), and 3 (a), the vibration unit 10 includes a connection member 11, a diaphragm 12, a vibration portion 14, a support portion 15, and a frame member 16. The vibrating portion 14, the supporting portion 15, and the frame-like member 16 are flat plates having a rectangular shape as a whole. The vibrating portion 14, the supporting portion 15, and the frame-like member 16 have a first main surface 18 and a second main surface 19, respectively.

In fig. 1 (a), 1 (B), 2 (a), 2 (B), and 3 (a), the width direction of the vibration unit 10 is defined as the X-axis direction, the length direction is defined as the Y-axis direction, and the thickness direction is defined as the Z-axis direction. Further, the XY plane direction corresponds to the "plane direction" in the present invention.

The frame member 16 has a rectangular shape in plan view. The frame-like member 16 has two first openings 21 and two second openings 22. The first openings 21 are disposed on both ends in the Y-axis direction, which is the longitudinal direction of the frame-shaped member 16. The second openings 22 are disposed on both ends in the X-axis direction, which is the short-side direction of the frame member 16. The first opening 21 is substantially rectangular and is long in the X-axis direction. The second opening 22 is a substantially rectangular opening that is long in the Y-axis direction. Further, both ends of the second opening 22 in the Y-axis direction are further extended in a rectangular shape toward the central axis of the frame member 16 (I-I line in fig. 1 a). The frame-like member 16 is connected to the support plate 43 via a double-sided tape 44 on the second main surface 19 side.

The vibrating portion 14 is rectangular in plan view and is disposed inside the frame-like member 16. The area of the vibrating portion 14 is smaller than the area of the portion surrounded by the frame-like member 16.

The support portion 15 connects the vibrating portion 14 and the frame member 16. The support portion 15 supports the vibrating portion 14 to the frame member 16. In this example, the support portion 15 has a rectangular shape elongated in the X-axis direction, and supports the vibrating portion 14 at both ends of the vibrating portion 14 in the Y-axis direction. The length of the support portion 15 in the X axis direction is longer than the length in the Y axis direction.

The frame-like member 16, the vibrating portion 14, and the supporting portion 15 are formed of the same member (for example, acrylic resin, PET, polycarbonate, epoxy glass, FRP, metal, glass, or the like). Examples of the metal include SUS (stainless steel material), and if necessary, the metal may be coated with a resin such as polyimide to be insulated.

The frame member 16, the vibrating portion 14, and the supporting portion 15 are formed by punching one rectangular plate member along the shapes of the first opening 21 and the second opening 22. The frame-shaped member 16, the vibrating portion 14, and the supporting portion 15 may be different members, but they can be easily manufactured by forming them from the same member. Alternatively, the frame-shaped member 16, the vibrating portion 14, and the supporting portion 15 are formed of the same member, and thus it is not necessary to use another member (a member having creep deterioration) such as rubber for supporting the vibrating portion 14. Therefore, the frame-shaped member 16 can stably hold the vibrating portion 14 for a long period of time.

The diaphragm 12 is connected to the frame member 16 and the vibrating portion 14 via the connecting member 11. The diaphragm 12 is connected to the vibrating portion 14 and the first main surface 18 side of the frame member 16. A first end of the diaphragm 12 in the longitudinal direction is connected to a first end of the frame member 16 in the Y-axis direction. The second end of the diaphragm 12 is connected to the second end of the vibrating portion 14 in the Y-axis direction. The connecting member 11 is, for example, an insulating double-sided tape. The diaphragm 12 is connected to the frame member 16 via the connecting member 11 by thermal welding, for example.

The connecting member 11 has a rectangular shape elongated in the short side direction of the frame-like member 16 in plan view. The connection member 11 has a certain thickness, and connects the diaphragm 12 and the vibrating portion 14 at a position separated by a certain degree so that the diaphragm 12 does not contact the vibrating portion 14. Thus, the electrodes, not shown, provided on both main surfaces of the diaphragm 12 do not contact the vibrating portion 14, and therefore the electrodes are not scratched even when the vibrating portion 14 vibrates due to the expansion and contraction of the diaphragm 12.

The diaphragm 12 is an example of a diaphragm that vibrates by deforming in the planar direction when a voltage is applied. The diaphragm 12 has a rectangular shape elongated in the longitudinal direction of the frame-like member 16 in plan view. The diaphragm 12 is made of polyvinylidene fluoride (PVDF), for example. The diaphragm 12 may be formed of a chiral polymer. Examples of the chiral polymer include levorotatory polylactic acid (PLLA) and dextrorotatory polylactic acid (PDLA).

In the case where PVDF is used as the vibration film 12, since PVDF has water resistance, the electronic device provided with the vibration member in this example can vibrate in the same manner in any humidity environment.

In addition, when PLLA is used for the diaphragm 12, PLLA is a highly permeable material, and therefore if the electrode and the vibrating portion attached to PLLA are transparent materials, the internal state of the device can be visually recognized, and manufacturing is easy. PLLA has no pyroelectricity, and therefore can vibrate similarly in any temperature environment. When the diaphragm 12 is formed of PLLA, the outer peripheries are cut so as to be at substantially 45 ° with respect to the extending direction, and can expand and contract in the Y-axis direction.

The drive circuit 17 applies a voltage to the diaphragm 12 to expand and contract the diaphragm 12. When a voltage is applied, the diaphragm 12 is deformed in the plane direction. Specifically, when a voltage is applied, the diaphragm 12 expands and contracts in the Y-axis direction. For example, as shown in fig. 3 (B), when a voltage is applied, the diaphragm 12 contracts in the Y-axis direction. The diaphragm 12 expands and contracts in the Y-axis direction, and the vibrating portion 14 vibrates in the Y-axis direction. The vibration of the vibrating portion 14 is transmitted to the support plate 43 via the double-sided adhesive tape 44. Thereby, the vibration generated in the vibration unit 14 is transmitted to the user in contact with the support plate 43.

The deformation of the vibration unit 10 when the vibration unit 14 vibrates will be described in detail while comparing fig. 3 (a) and 3 (B). When the vibrating portion 14 has not vibrated yet, the vibrating portion 14 is located at a position separated from the frame member 16 by a predetermined distance as shown in fig. 3 (a). On the other hand, when the diaphragm 12 contracts, the support portion 15 and the vibrating portion 14 are elongated in the Y-axis direction. Therefore, the positions of the support portion 15 and the vibrating portion 14 move in the Y-axis direction. At this time, the frame-like member 16 does not move in the Y-axis direction. Therefore, as shown in fig. 3 (B), the vibrating portion 14 approaches the left support portion 15 shown in fig. 3 (B). Thus, the vibrating portion 14 vibrates, and the distance between the vibrating portion 14 and the frame-like member 16 changes.

The vibrating portion 14 may vibrate in the XY plane direction, and the method of vibrating the vibrating portion 14 is not limited to the above example. For example, a motor or the like may be used to vibrate the vibration unit 14.

Fig. 4 (a) is a partially enlarged plan view of a region II in fig. 3 (a). Fig. 4 (B) is a partially enlarged plan view of a region III in fig. 3 (a). As shown in fig. 4 (a), the corner 31 of the vibrating portion 14 is chamfered. The chamfering of the corner portion 31 may be performed simultaneously with, for example, punching the frame member 16, the vibrating portion 14, and the support portion 15. Alternatively, the frame member 16, the vibrating portion 14, and the support portion 15 may be punched out, and then the corner portion 31 may be cut out.

The vibrating portion 14 may vibrate largely as compared with a case of performing normal vibration. For example, when the user drops the vibration device 100 in the Y-axis direction shown in fig. 3 (B), the vibration unit 14 vibrates in the Y-axis direction more largely than the vibration in the state shown in fig. 3 (B).

Fig. 5 (a) is an enlarged plan view of the periphery of the corner portion 31 in the case where the vibrating portion 14 generates large vibration, and fig. 5 (B) is an enlarged plan view of the periphery of the corner portion 71 in the case where the vibrating portion 74 generates large vibration in the reference example.

When the vibration portion 14 generates large vibration, the vibration portion 14 and the support portion 15 approach each other as shown in fig. 5 (a). The distance between the corner 31 of the vibrating portion 14 and the support portion 15 is increased by the amount of chamfering. Therefore, the corner 31 of the vibrating portion 14 is less likely to collide with the support portion 15. The vibrating portion 14 is less likely to collide with the support portion 15, and thus damage to the support portion 15 can be prevented. Therefore, the vibration device 100 does not damage the support portion 15 and has excellent durability.

In contrast, as shown in fig. 5 (B), the vibration portion 74 in the reference example is not chamfered. In this case, when the vibration portion 74 generates large vibration, the vibration portion 74 collides with the support portion 15. This may cause damage such as a dent or a cut to the support portion 15, which may reduce the durability of the vibration device.

The corner 31 of the vibrating portion 14 need not be formed as a curved surface. For example, chamfering may be performed such that a part of the vibrating portion 14 is cut so that the corner 31 of the vibrating portion 14 is formed at 45 degrees with respect to the X-axis direction. In this case, since the distance between the corner 31 of the vibrating portion 14 and the support portion 15 is also increased, the vibrating portion 14 can be prevented from damaging the support portion 15. However, in the case where the corner 31 of the vibrating portion 14 is a curved surface, the supporting portion 15 is less likely to be damaged even if the vibrating portion 14 comes into contact with the supporting portion 15, as compared with the case where the corner 31 of the vibrating portion 14 is angular.

When the corner 31 of the vibrating portion 14 is a curved surface, the radius of curvature R of the curved surface is preferably 1.0mm or more. This can sufficiently secure the distance between the corner 31 of the vibrating portion 14 and the support portion 15. Therefore, even when the vibrating portion 14 vibrates largely, the distance from the corner portion 31 of the vibrating portion 14 to the support portion 15 is sufficiently secured, and therefore, collision with the support portion 15 can be prevented.

[ falling test ]

Next, a drop test using the vibration device 100 of examples 1 to 5 will be described. The components of the vibration device 100 are formed under the following conditions.

Metallic holder (corresponding to case 2)

Thickness of the epoxy glass plate (corresponding to the support plate 43) in the Z-axis direction was 1.2mm

Thickness of the cushion (corresponding to the cushion material 42) in the Z-axis direction was 3.0mm

Width of double-sided tape in Y-axis direction of 3.0mm

The vibration unit 10 was formed in different shapes for each of the examples under the following conditions. As shown in fig. 4 (B), the width W of the support portion 15 is the width of the linear portion of the support portion 15 in the Y-axis direction.

Example 1: the width W of the support part 15 is 0.7mm, and the curvature radius R of the corner part 31 is 5.0mm

Example 2: the width W of the support part 15 is 0.8mm, and the curvature radius R of the corner part 31 is 1.0mm

Example 3: the width W of the support part 15 is 0.8mm, and the curvature radius R of the corner part 31 is 3.0mm

Example 4: the width W of the support part 15 is 0.8mm, and the curvature radius R of the corner part 31 is 5.0mm

Example 5: the width W of the support part 15 is 0.9mm, and the curvature radius R of the corner part 31 is 5.0mm

The dropping test was performed under the following conditions.

Drop height 90cm

Concrete flooring material

Y-axis direction of the vibration device 100 in a falling state

Number of drops 3 times

The total weight of each sample (the total weight of the vibration device 100 and the metal holder) 52g

The samples of each example were subjected to a drop test. The present inventors performed appearance, dimensional evaluation, and characteristic evaluation before and after the drop test. The appearance was confirmed by visual observation. For the dimensional evaluation, the size of the gap between the support portion 15 and the frame-like member 16 as indicated by L in fig. 3 (a) was measured. For the characteristic evaluation, the resonance frequency and acceleration of the vibrating portion 14 are measured. The results of the size evaluation and the characteristic evaluation were obtained by calculating the average of five samples. The results of the drop test are shown below.

Fig. 6 is a graph showing the results of the drop test. As shown in fig. 6, in any of examples 1 to 5, no deformation of the sample before and after the test was observed. For example, the periphery of the contact between the support portion 15 and the frame member 16 is not deformed. In example 2 having the most severe structure, in particular, no trace of collision between the vibrating portion 14 and the support portion 15 was observed.

As shown in fig. 6, in the dimensional evaluation, in all of examples 1 to 5, it was confirmed that the dimension of the gap between the support portion 15 and the frame-like member 16 (support portion gap) was hardly changed before and after the test. In all of examples 1 to 5, it was confirmed that the resonance frequency and acceleration of the vibrating portion 14 hardly changed before and after the test.

Thus, in all examples, it was confirmed that there was almost no change before and after the test. Therefore, the vibrating portion 14 does not damage the frame-like member 16 as long as the curvature radius R is 1.0mm or more. Further, the support portion 15 and the like are not deformed. Therefore, it was confirmed that the vibration device 100 was excellent in durability.

Finally, all points of the description of the present embodiment should be considered as examples, and not as limitations of the present invention. The scope of the present invention is not limited to the above-described embodiments, but is defined by the claims. The scope of the present invention is intended to include meanings equivalent to the claims and all modifications within the scope.

Claims (3)

1. A vibration device is characterized in that a vibration motor is arranged in a vibration chamber,

the vibration device is provided with:

a rectangular flat plate-like vibrating portion;

a frame-shaped member surrounding the vibrating portion;

a support portion connecting the vibration portion and the frame-shaped member; and

a diaphragm that is provided so as to be stretched over the vibrating section and the frame-shaped member in a state where tension is applied, and that vibrates in a planar direction,

the corners of the vibrating portion are chamfered.

2. Vibrating device according to claim 1,

the corner of the vibrating portion is formed as a curved surface.

3. Vibrating device according to claim 2,

the curvature radius of the curved surface is more than 1.0 mm.

Images