Vibration device

Abstract

The vibrating device includes: a vibrating body; a piezoelectric element located at one end of the vibrating body in the first direction; a translucent body located at the other end of the vibrating body in the first direction; a pressing part that sandwiches the translucent body in the first direction together with the other end of the vibrating body; a first member located between the light-transmitting body and the pressing part and connected to the light-transmitting body and the pressing part; and a second member located between the light-transmitting body and the vibrating body and connected to the light-transmitting body and the vibrating body. The thickness of the first member is greater than or equal to the thickness of the second member.

Description

Technical Field

[0001] The present disclosure relates to vibration devices. Background Art

[0002] Patent Document 1 discloses a liquid droplet removal device including: an optical element including a dome portion; an excitation member that causes the dome portion to generate bending vibrations; a vibration control device that controls the excitation member; and a drip-proof seal that suppresses penetration of liquid droplets into the interior.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2017-170303 Summary of the invention

[0006] Problem that the invention aims to solve

[0007] The liquid droplet removing device described in Patent Document 1 still has room for improvement in terms of suppressing the penetration of liquid droplets into the interior and reducing the stress applied to the light-transmitting body.

[0008] An object of the present disclosure is to provide a vibration device that can suppress penetration of liquid droplets into the interior and reduce stress applied to a light-transmitting body.

[0009] Solutions for solving problems

[0010] A vibration device according to one embodiment of the present disclosure includes:

[0011] vibrating body;

[0012] a piezoelectric element located at one end of the vibrating body in the first direction;

[0013] a light-transmitting body located at the other end of the vibrating body in the first direction;

[0014] A pressing portion, which, together with the other end of the vibrating body, sandwiches the light-transmitting body in the first direction;

[0015] a first member located between the light-transmitting body and the pressing portion and connected to the light-transmitting body and the pressing portion; and

[0016] a second member, which is located between the light-transmitting body and the vibrating body and is connected to the light-transmitting body and the vibrating body,

[0017] The thickness of the first member is greater than or equal to the thickness of the second member.

[0018] A vibration device according to one embodiment of the present disclosure includes:

[0019] vibrating body;

[0020] a piezoelectric element located at one end of the vibrating body in the first direction;

[0021] a light-transmitting body located at the other end of the vibrating body in the first direction;

[0022] A pressing portion, which, together with the other end of the vibrating body, sandwiches the light-transmitting body in the first direction;

[0023] a first member located between the light-transmitting body and the pressing portion and connected to the light-transmitting body and the pressing portion; and

[0024] a second member, which is located between the light-transmitting body and the vibrating body and is connected to the light-transmitting body and the vibrating body,

[0025] The Young's modulus of the first member is less than or equal to the Young's modulus of the second member.

[0026] Effects of the Invention

[0027] According to the vibration device of the above aspect, it is possible to suppress the penetration of liquid droplets into the interior and reduce the stress applied to the light-transmitting body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a perspective view showing a vibration device according to one embodiment of the present disclosure.

[0029] Figure 2 It is along Figure 1 Cross-sectional view along line II-II.

[0030] Figure 3 It is used to explain the first component Figure 2 A partial enlarged view of .

[0031] Figure 4 It is used to explain the second component Figure 2 A partial enlarged view of .

[0032] Figure 5 This is a graph showing the relationship between the thickness of the first member and the second member and the maximum displacement of the lens top.

[0033] Figure 6 This is a graph showing the relationship between the thickness of the first member and the second member and the maximum thermal stress applied to the lens.

[0034] Figure 7 It is a contour diagram showing the thermal stress applied to the lens.

[0035] Figure 8 This is a graph showing the relationship between the Young's modulus of the first member and the second member and the maximum displacement of the lens top.

[0036] Fig. 9 This is a graph showing the relationship between the Young's modulus of the first member and the second member and the maximum thermal stress applied to the lens.

[0037] Fig.10 Yes means Figure 1 A cross-sectional view of a first variant of the vibration device.

[0038] Fig.11 Yes means Figure 1 A cross-sectional view of a second variant of the vibration device.

[0039] Fig.12 Yes means Figure 1 A cross-sectional view of a third variant of the vibration device.

[0040] Fig.13 Yes means Figure 1 A cross-sectional view of a fourth variant of the vibration device.

[0041] Fig.14 Yes means Figure 1 A cross-sectional view of a fifth variant of the vibration device.

[0042] Fig.15 Yes means Figure 1 A cross-sectional view of a sixth variant of the vibration device.

[0043] Fig.16 Yes means Figure 1 A cross-sectional view of the 7th variant of the vibration device.

[0044] Fig.17 It is along Fig.13 A cross-sectional view taken along line XVII-XVII.

[0045] Fig.18 Yes means Figure 1 A cross-sectional view of an 8th variant of the vibration device. DETAILED DESCRIPTION

[0046] Various aspects of the present disclosure are described.

[0047] The vibration device of the first aspect of the present disclosure includes:

[0048] vibrating body;

[0049] a piezoelectric element located at one end of the vibrating body in the first direction;

[0050] a light-transmitting body located at the other end of the vibrating body in the first direction;

[0051] A pressing portion, which, together with the other end of the vibrating body, sandwiches the light-transmitting body in the first direction;

[0052] a first member located between the light-transmitting body and the pressing portion and connected to the light-transmitting body and the pressing portion; and

[0053] a second member, which is located between the light-transmitting body and the vibrating body and is connected to the light-transmitting body and the vibrating body,

[0054] The thickness of the first member is greater than or equal to the thickness of the second member.

[0055] According to the vibration device of the first embodiment, the first member and the second member function as a buffer layer for attenuating the thermal stress generated by the difference in linear expansion coefficients of the light-transmitting body, the vibration body, and the pressing portion. Therefore, the bonding reliability between the light-transmitting body and the vibration body and the bonding reliability between the light-transmitting body and the pressing portion can be improved.

[0056] The vibration device according to the second aspect of the present disclosure is the vibration device according to the first aspect.

[0057] The Young's modulus of the first member is less than or equal to the Young's modulus of the second member.

[0058] According to the vibration device of the second aspect, it is possible to more reliably improve the bonding reliability between the light-transmitting body and the vibration body and the bonding reliability between the light-transmitting body and the pressing portion.

[0059] The vibration device according to the third aspect of the present disclosure is the vibration device according to the first aspect or the second aspect.

[0060] The second member includes a material having an adhesive function.

[0061] According to the vibration device of the third aspect, it is possible to more reliably suppress the vibration attenuation of the vibration device.

[0062] A vibration device according to a fourth aspect of the present disclosure is the vibration device according to any one of the first to third aspects,

[0063] The first member includes a material having a waterproof function.

[0064] According to the vibration device of the fourth aspect, it is possible to more reliably suppress the penetration of droplets into the interior of the vibration device.

[0065] The vibration device of the fifth aspect of the present disclosure includes:

[0066] vibrating body;

[0067] a piezoelectric element located at one end of the vibrating body in the first direction;

[0068] a light-transmitting body located at the other end of the vibrating body in the first direction;

[0069] A pressing portion, which, together with the other end of the vibrating body, sandwiches the light-transmitting body in the first direction;

[0070] a first member located between the light-transmitting body and the pressing portion and connected to the light-transmitting body and the pressing portion; and

[0071] a second member, which is located between the light-transmitting body and the vibrating body and is connected to the light-transmitting body and the vibrating body,

[0072] The Young's modulus of the first member is less than or equal to the Young's modulus of the second member.

[0073] According to the vibration device of the fifth embodiment, the first member and the second member function as a buffer layer for attenuating the thermal stress generated by the difference in linear expansion coefficients of the light-transmitting body, the vibration body, and the pressing portion. Therefore, the bonding reliability between the light-transmitting body and the vibration body and the bonding reliability between the light-transmitting body and the pressing portion can be improved.

[0074] The vibration device according to the sixth aspect of the present disclosure is the vibration device according to the fifth aspect,

[0075] The thickness of the first member is greater than or equal to the thickness of the second member.

[0076] According to the vibration device of the sixth aspect, it is possible to more reliably improve the bonding reliability between the light-transmitting body and the vibration body and the bonding reliability between the light-transmitting body and the pressing portion.

[0077] The vibration device according to the seventh aspect of the present disclosure is the vibration device according to the fifth aspect or the sixth aspect.

[0078] The second member includes a material having an adhesive function.

[0079] According to the vibration device of the seventh aspect, it is possible to more reliably suppress the vibration attenuation of the vibration device.

[0080] The vibration device according to an eighth aspect of the present disclosure is the vibration device according to any one of the fifth to seventh aspects,

[0081] The first member includes a material having a waterproof function.

[0082] According to the vibration device of the eighth aspect, it is possible to more reliably suppress the penetration of droplets into the interior of the vibration device.

[0083] A vibration device according to a ninth aspect of the present disclosure is the vibration device according to any one of the first to eighth aspects,

[0084] The vibration device includes an external vibration body and a stopper.

[0085] The external vibrating body has:

[0086] a first connecting portion, which is provided with the pressing portion and is connected to the light-transmitting body via the pressing portion;

[0087] a second connection portion extending from the first connection portion in a direction intersecting the first direction toward a direction away from the light-transmitting body; and

[0088] a fixing portion connected to an end portion of the second connecting portion, which is opposite to the end portion connected to the first connecting portion, of both ends of the second connecting portion in a direction intersecting the first direction,

[0089] The stopper is connected to the fixing portion in a state where the second connecting portion can contact the fixing portion.

[0090] A first gap is provided between the stopper portion and the second connection portion in the first direction.

[0091] According to the vibration device of the ninth aspect, for example, when an external force is applied to the light-transmitting body toward the inside of the vibration device, the second connection portion contacts the stopper, thereby preventing the light-transmitting body from colliding with a member located inside the vibration device. In addition, for example, when a stress is applied to the second connection portion, the second connection portion contacts the stopper, thereby preventing the second connection portion from being excessively deformed.

[0092] The vibration device according to the tenth aspect of the present disclosure is the vibration device according to the ninth aspect,

[0093] The stopper portion has an inclined surface facing the second connecting portion in the first direction,

[0094] The inclined surface is inclined in a direction away from the second connecting portion in the first direction as it approaches the first connecting portion in a direction intersecting the first direction.

[0095] According to the vibration device of the tenth aspect, it is possible to more reliably prevent the light-transmitting body from colliding with a member located inside the vibration device, and it is possible to more reliably prevent the second connection portion from being excessively deformed.

[0096] The vibration device according to the 11th aspect of the present disclosure is the vibration device according to the 9th aspect or the 10th aspect,

[0097] The fixing portion is configured to surround the vibrating body around the optical axis of the light-transmitting body.

[0098] The stopper has a circular ring shape extending in a circumferential direction relative to the optical axis.

[0099] According to the vibration device of the eleventh aspect, it is possible to more reliably prevent the light-transmitting body from colliding with a member located inside the vibration device, and it is possible to more reliably prevent the second connection portion from being excessively deformed.

[0100] The vibration device according to the twelfth aspect of the present disclosure is the vibration device according to the ninth aspect or the tenth aspect,

[0101] The fixing portion is configured to surround the vibrating body around the optical axis of the light-transmitting body.

[0102] The stopper includes a plurality of members located at intervals in a circumferential direction relative to the optical axis.

[0103] According to the vibration device of the twelfth aspect, it is possible to more reliably prevent the light-transmitting body from colliding with a member located inside the vibration device, and it is possible to more reliably prevent the second connection portion from being excessively deformed.

[0104] A vibration device according to a thirteenth aspect of the present disclosure is the vibration device according to any one of the ninth to twelfth aspects,

[0105] The fixing portion and the stopper portion are integrally formed.

[0106] According to the vibration device of the thirteenth aspect, it is not necessary to connect the stopper portion to the fixing portion, and thus it is possible to reduce the manufacturing cost of the vibration device.

[0107] A vibration device according to a fourteenth aspect of the present disclosure is the vibration device according to any one of the ninth to thirteenth aspects,

[0108] The fixing portion has a first opposing surface that is opposed to the second connecting portion at a distance in the first direction.

[0109] The stopper is connected to the first opposing surface.

[0110] According to the vibration device of the fourteenth aspect, it is possible to more reliably prevent the light-transmitting body from colliding with a member located inside the vibration device, and it is possible to more reliably prevent the second connection portion from being excessively deformed.

[0111] A vibration device according to a fifteenth aspect of the present disclosure is the vibration device according to any one of the ninth to thirteenth aspects,

[0112] The fixing portion has a second opposing surface that opposes the vibrating body with a gap in a direction intersecting the first direction.

[0113] The stopper is connected to the second opposing surface.

[0114] According to the vibration device of the fifteenth aspect, the size of the first gap can be adjusted according to the structure of the vibration device, the material of each member constituting the vibration device, and the like.

[0115] A vibration device according to a sixteenth aspect of the present disclosure is the vibration device according to any one of the ninth to fifteenth aspects,

[0116] The stopper portion includes a first layer and a second layer stacked in the first direction,

[0117] The first layer is located closer to the second connection portion than the second layer, and is configured to have an elastic modulus smaller than an elastic modulus of the second layer.

[0118] According to the vibration device of the 16th scheme, the deformation speed of the second connection part in contact with the stopper becomes slow, which can more reliably prevent excessive deformation of the second connection part. In addition, it is possible to prevent the second connection part from being damaged when the second connection part contacts the stopper.

[0119] A vibration device according to a seventeenth aspect of the present disclosure is the vibration device according to any one of the ninth to sixteenth aspects,

[0120] The first gap has a size that is larger than the maximum amplitude of the light-transmitting body and smaller than the second gap.

[0121] According to the vibration device of the seventeenth aspect, it is possible to more reliably prevent the light-transmitting body from colliding with a member located inside the vibration device, and it is possible to more reliably prevent the second connection portion from being excessively deformed.

[0122] The following description is provided with reference to the accompanying drawings to explain the embodiments of the present disclosure. The following description does not limit the present disclosure, but is essentially only an example and can be appropriately changed without departing from the scope of the present disclosure. The accompanying drawings are schematic diagrams, and the ratios of various dimensions may not be consistent with reality.

[0123] like Figure 1 to Figure 4 As shown, the vibration device 1 according to one embodiment of the present disclosure includes a lens 5 (an example of a light-transmitting body), an internal vibrator (an example of a vibrator) 7 , a piezoelectric element 9 , a pressing portion 31 b , a first member 40 , and a second member 50 .

[0124] As an example, the lens 5 is made of glass. Figure 1 As shown in FIG. 1 , the upper surface of the lens 5 is convex and coated with a waterproof coating and an anti-reflection film (AR coating). A protrusion 501 extending radially outward is provided at the radial outer end of the lens 5. The upper surface 502 (refer to FIG. 1 ) of the protrusion 501 is Figure 3 ) is bent along a curved surface 317 of a pressing portion 31b described later.

[0125] As an example, the internal vibrator 7 has a cylindrical body, amplifies the vibration from the piezoelectric element 9, and vibrates the lens 5. Figure 2 As shown, the internal vibrator 7 is composed of a first portion 71 in contact with the lens 5, a second portion 72 on which the piezoelectric element 9 is mounted, and a third portion 73 having a substantially S-shaped cross-sectional shape connecting the first portion 71 and the second portion 72. The first portion 71 has a cylindrical shape formed by extending the shape in the axial direction of the cylindrical body (for example, the first direction Z). The first portion 71 extends in the radial direction of the cylindrical body and is connected to the external vibrator 3. The second portion 72 is a portion that vibrates together with the vibration of the piezoelectric element 9, and has a larger plate thickness than the first portion 71 and the third portion 73. As a result, it is easy to more efficiently transmit the vibration of the piezoelectric element 9 to the lens 5. The third portion 73 is a portion that supports the first portion 71 and transmits the vibration of the second portion 72 to the first portion 71. The third portion 73 constitutes one end of the internal vibrator 7 in the first direction Z, and the first portion 71 constitutes the other end of the internal vibrator 7 in the first direction Z.

[0126] The first portion 71, the second portion 72, and the third portion 73 may be formed integrally or separately. Figure 2 As shown, the maximum outer dimension of the third portion 73 (= maximum dimension in the X direction) is larger than that of the first portion 71, and the maximum outer dimension of the second portion 72 is larger than that of the third portion 73. Thus, the vibration of the piezoelectric element 9 can be efficiently transmitted to the lens 5.

[0127] The piezoelectric element 9 includes a piezoelectric body and electrodes. The piezoelectric body includes, for example, barium titanate (BaTiO 3 ), lead zirconate titanate (PZT: PbTiO 3 ·PbZrO 3 ), lead titanate (PbTiO 3 ), lead metaniobate (PbNb 2 O 6 ), bismuth titanate (Bi 4 Ti 3 O 12 )、(K,Na)NbO 3 Piezoelectric ceramics or LiTaO 3 、LiNbO 3 The electrode may be a Ni electrode, for example. The electrode may be an electrode made of a metal thin film such as Ag or Au formed by sputtering. Alternatively, the electrode may be formed by plating or evaporation other than sputtering.

[0128] In the present embodiment, the piezoelectric element 9 is connected to the second portion 72 of the internal vibrating body 7 by an adhesive and is formed into a ring shape when viewed along the first direction Z. However, the present invention is not limited thereto and any shape is acceptable as long as it can vibrate the internal vibrating body 7 .

[0129] The pressing portion 31b constitutes a part of the external vibrating body 3. Figure 1 As shown, the external vibrator 3 includes a first connection portion 31 and a second connection portion 33 in addition to the fixing portion 35. The pressing portion 31b is configured to be able to sandwich the protrusion 501 of the lens 5 together with the first portion 71 of the internal vibrator 7. In the present embodiment, the first connection portion 31 is located radially outside the first portion 71 of the internal vibrator 7 and the lens 5, and extends from the second connection portion 33 along the first direction Z toward the outside of the vibration device 1. The pressing portion 31b protrudes toward the lens 5 from the end of the first connection portion 31 farther from the second connection portion 33 in the first direction Z. A curved surface 317 (see FIG. 2 ) protruding toward the lens 5 is provided at the top end of the pressing portion 31b (i.e., the end opposite to the lens 5). Figure 3 ). That is, the pressing portion 31b is provided on the first connecting portion 31. The first connecting portion 31 is connected to the lens 5 via the pressing portion 31b.

[0130] The second connection portion 33 extends from the first connection portion 31 in a direction intersecting the first direction Z (for example, the X direction) in a direction away from the lens 5. In the present embodiment, the second connection portion 33 extends in a ring shape in a direction perpendicular to the optical axis direction of the lens 5 (for example, the first direction Z) (in other words, in a radial direction relative to the optical axis direction). The thickness of the second connection portion 33 is smaller than the thickness of the fixing portion 35, for example, a thickness of not less than 0.2 mm and not more than 1.0 mm. In addition, the thickness of the second connection portion 33 is, for example, not less than 0.2 times and not more than 1.5 times the thickness of the third portion 73 of the internal vibrator 7. The second connection portion 33 has such a thin wall thickness, and therefore has a function as a leaf spring. In the present embodiment, the second connection portion 33 is configured to be elastically deformable along the first direction Z in a manner that absorbs vibrations generated in the lens 5.

[0131] The fixing portion 35 is connected to an end portion 332 of the second connecting portion 33 on the opposite side of the end portion 331 connected to the first connecting portion 31, of both ends in the direction intersecting the first direction Z. The fixing portion 35 is connected to, for example, a housing (not shown) for storing an imaging element and a lens module 15 (see Fig.13) and other components, have nodes that suppress vibrations to less than one percent of the displacement of the lens 5, and are configured so that vibrations are not transmitted to these components. The larger the volume of the fixing portion 35, the more the vibration of the fixing portion 35 can be suppressed. In the present embodiment, the fixing portion 35 has a quadrilateral shape. If the shape is a quadrilateral, the volume of the fixing portion 35 can be increased without increasing the size of the vibration device 1. For example, the volume of a cube of 25 mm × 25 mm is larger than that of a cylinder with a diameter of 25 mm.

[0132] In the vibration device 1 , an elastic body such as rubber or an adhesive layer is provided in a portion 100 surrounded by the lens 5 , the first connection portion 31 of the external vibration body 3 , and the first portion 71 of the internal vibration body 7 . This reduces the load on the lens 5 .

[0133] like Figure 3 As shown in FIG. 1 , the first member 40 is located between the lens 5 and the pressing portion 31 b and is connected to the lens 5 and the pressing portion 31 b. Figure 4 As shown, the second member 50 is located between the lens 5 and the internal vibrator 7 and connected to the lens 5 and the internal vibrator 7. The first member 40 and the second member 50 are made of any material such as resin or metal and are configured to satisfy at least one of the following two conditions.

[0134] The thickness tA of the first member 40 is equal to or greater than the thickness tB of the second member 50 (tA ≥ tB).

[0135] The Young's modulus yA of the first member 40 is less than or equal to the Young's modulus yB of the second member 50 (yA≤yB).

[0136] The thickness tA of the first member 40 is defined at the smallest thickness portion of the first member 40. The thickness tB of the second member 50 is substantially uniform due to the flatness of the bonding surface between the lens 5 and the internal vibrator 7 and can therefore be defined at any portion of the second member 50.

[0137] For example, when the first member 40 and the second member 50 are made of a liquid adhesive, the thickness tA and tB of the first member 40 and the second member 50 can be controlled by the viscosity of the adhesive, the amount of pressure applied when the adhesive is cured, the diameter of the spacer added to the adhesive, etc. The thickness tA and tB of the first member 40 and the second member 50 can be confirmed by observing the cross section of the vibration device 1 using a microscope, for example.

[0138] In the design to maximize the vibration of the lens 5, the key point is to amplify the fine breathing vibration of the piezoelectric element 9 by using the internal vibrator 7 and the pressing part 31b, so that the vibration is transmitted to the lens 5. The first member 40 and the second member 50 mainly have two functions of "transmission of vibration" and "strengthening the reliability of bonding between different materials". In "transmission of vibration", the Young's modulus of the first member 40 and the second member 50 is small, so it is advantageous for the first member 40 and the second member 50 to be thin. In "strengthening the reliability of bonding between different materials", considering the role of the buffer layer that attenuates the thermal stress generated by the difference in linear expansion coefficients of the components of the lens 5, the internal vibrator 7 and the pressing part 31b, it is advantageous for the first member 40 and the second member 50 to have a relatively large thickness. However, it is known that the vibration characteristics and the thickness sensitivity of the thermal stress are different depending on the location of the first member 40 and the second member 50. That is, if the relationship of thickness sensitivity becomes clear, by controlling the thickness of the first member 40 and the second member 50 for each portion, it is possible to select a relationship that is advantageous for both “transmission of vibration” and “enhancement of bonding reliability between dissimilar materials”.

[0139] Figure 5 This is a graph showing the relationship between the thicknesses tA and tB of the first member 40 and the second member 50 and the maximum displacement of the top of the lens 5 obtained using FEM (finite element method). The physical constants used in the FEM calculation results are shown in Table 1 below.

[0140] [Table 1]

[0141]

[0142] The displacement of the top of the lens 5 is set to a relative value when 0.001 mm = 100 together with tA and tB. When the thickness of one of the first member 40 and the second member 50 is changed, the thickness of the other of the first member 40 and the second member 50 is fixed to 0.005 mm. As a result, it can be seen that the sensitivity of the displacement of the top of the lens 5 to the thickness of the first member 40 and the second member 50 is greater than the sensitivity to the second member 50 (tB), and as the thickness of the second member 50 increases, the displacement of the top of the lens 5 is attenuated. The reason is as follows. As the tiny displacement generated by the piezoelectric element 9 is amplified in the process of passing through the piezoelectric element 9, the internal vibrator 7, the second member 50 and the lens 5, the stress applied to the second member 50 increases, and it is easy to deform. The epoxy resin used as the material of the first member 40 and the second member 50 is a material with a relatively small Young's modulus, so there is an effect of attenuating vibration by deformation. That is, the attenuation of the displacement of the top of the lens 5 is small by increasing the thickness tA of the first component 40 which has a smaller deformation and a smaller contribution to the vibration transmission of the lens 5, but the attenuation of the displacement of the top of the lens 5 is large by increasing the thickness tB of the second component 50 which has a larger deformation.

[0143] On the other hand, in terms of strengthening the reliability of the bonding between dissimilar materials, the thicknesses tA and tB of the first component 40 and the second component 50 play different roles. Special attention is paid to the stress caused by the thermal stress applied by the thermal load rather than the vibration action. At the bonding part of dissimilar materials, the greater the difference in the linear expansion coefficients of the components, the greater the thermal stress applied, which may cause the peeling of the first component 40 and the second component 50, the damage of the components, etc. For example, as shown in Table 1 above, the linear expansion coefficient of the lens 5 (glass) is 0.6×10 -5 (1 / deg), the linear expansion coefficient of the pressing portion 31b (stainless steel) is 1.03×10 -5 If a combination with a linear expansion coefficient that is further different is selected, the thermal stress applied to each member of the lens 5, the internal vibrator 7, and the pressing portion 31b increases.

[0144] Figure 6It is a graph showing the relationship between the thickness tA, tB of the first component 40 and the second component 50 obtained using FEM and the maximum thermal stress applied to the lens 5. The physical constants used in the FEM calculation results are shown in the above Table 1. The thermal stress is set to a relative value when 0.001mm=100 together with tA and tB. When the thickness of one of the first component 40 and the second component 50 is changed, the thickness of the other of the first component 40 and the second component 50 is fixed to 0.005mm. As a result, it can be seen that the sensitivity of the thermal stress to the thickness tA, tB of the first component 40 and the second component 50 is larger with respect to the first component 40 (tA), and the thermal stress is greatly attenuated as the first component 40 becomes thicker. On the other hand, there is almost no change in the thermal stress generated by the thickening of the second component 50 (tB). The reason is that the location where the larger thermal stress is applied is near the pressing portion 31b (refer to Figure 7 ).

[0145] From the above, it can be seen that from the viewpoints of “transmission of vibration” and “enhancement of bonding reliability between different materials”, the effective relationship between tA and tB is “tA ≥ tB”. This relationship holds true regardless of the shape of the lens 5.

[0146] Figure 8 : This is a graph showing the relationship between the Young's modulus yA and yB of the first member 40 and the second member 50 obtained using FEM and the maximum displacement of the top of the lens 5. The physical constants used in the FEM calculation results are shown in the above Table 1. The maximum displacement of the top of the lens 5 is set as a relative value when yA and yB are 3GPa=100. When the Young's modulus of one of the first member 40 and the second member 50 is changed, the Young's modulus of the other of the first member 40 and the second member 50 is fixed to 3GPa. As a result, it can be seen that the sensitivity of the displacement of the top of the lens 5 to the Young's modulus yA and yB of the first member 40 and the second member 50 is greater than that of the second member 50 (yB), and the displacement of the top of the lens 5 increases as the Young's modulus increases. On the other hand, the first member 40 (yA) has almost no sensitivity to the displacement of the top of the lens 5 relative to the change of the Young's modulus.

[0147] Fig. 9It is a graph showing the relationship between the Young's modulus yA and yB of the first component 40 and the second component 50 obtained using FEM and the maximum thermal stress applied to the lens 5. The physical constants used in the FEM calculation results are shown in the above Table 1. The thermal stress is set to a relative value when yA and yB are 3GPa=100. When the Young's modulus of one of the first component 40 and the second component 50 is changed, the Young's modulus of the other of the first component 40 and the second component 50 is fixed to 3GPa. As a result, it can be seen that the sensitivity of thermal stress to Young's modulus is greater than that of the first component 40 (yA), and as the Young's modulus decreases, the thermal stress is greatly attenuated. On the other hand, the second component 50 (yB) has almost no sensitivity to thermal stress to Young's modulus.

[0148] From the above, it can be seen that from the perspective of "transmission of vibration" and "enhancement of bonding reliability between dissimilar materials", the effective relationship between yA and yB is "yA≤yB". This relationship holds regardless of the type of material used for the first member 40 and the second member 50. That is, the first member 40 and the second member 50 may be made of the same material or different materials.

[0149] The vibration device 1 disclosed in the present invention includes: an internal vibrating body 7; a piezoelectric element 9, which is located at one end of the internal vibrating body 7 in the first direction; a lens 5, which is located at the other end of the internal vibrating body 7 in the first direction; a pressing portion 31b, which, together with the other end of the internal vibrating body 7, sandwiches the lens 5 in the first direction; and a first member 40 and a second member 50. The first member 40 is located between the lens 5 and the pressing portion 31b, and is connected to the lens 5 and the pressing portion 31b. The second member 50 is located between the lens 5 and the internal vibrating body 7, and is connected to the lens 5 and the internal vibrating body 7. The first member 40 and the second member 50 are configured to satisfy at least one of the following conditions. With such a structure, the bonding reliability between the lens 5 and the internal vibrating body 7 and the bonding reliability between the lens 5 and the pressing portion 31b can be improved.

[0150] The thickness tA of the first member 40 is equal to or greater than the thickness tB of the second member 50 (tA ≥ tB).

[0151] The Young's modulus yA of the first member 40 is less than or equal to the Young's modulus yB of the second member 50 (yA≤yB).

[0152] The vibration device 1 can also be configured as follows.

[0153] The first member 40 may include a waterproof material. This can more reliably suppress the penetration of droplets into the vibrating device 1. The waterproof material includes, for example, a material that satisfies IPX9K of the IP test based on the vehicle-mounted automobile component standard ISO20653.

[0154] Alternatively, the second member 50 may include a material having an adhesive function. This ensures the vibration characteristics of the vibration device 1 and more reliably suppresses the vibration attenuation of the vibration device 1. The material having an adhesive function includes, for example, an adhesive having a tensile strength between the lens 5 and the internal vibrator 7 that is greater than the shear stress value or Z vertical stress value applied when the vibration device 1 is driven.

[0155] The shapes of the lens 5 and the pressing portion 31b are not limited to the above-described embodiment. Fig.10 As shown in FIG. 1 , a straight-extending inclined surface 318 is provided at the top of the pressing portion 31b, and an inclined surface 503 opposite to the inclined surface 318 is provided on the upper surface of the protrusion 501 of the lens 5. Alternatively, Fig.11 As shown, a flat upper surface 504 is provided on the lens 5, and a pressing surface 319 facing the upper surface 504 of the lens 5 is provided at the top end of the pressing portion 31b.

[0156] The pressing portion is not limited to the case where the pressing portion 31b constitutes a part of the vibrating body (in the above embodiment, the external vibrating body 3). Fig.12 As shown, it is composed of a member (also called a pressing member) 60 independent of the vibrating body. Fig.12 In the vibration device 1, the pressing member 60 includes, for example, a cylindrical side wall 62 and a pressing portion 61 protruding inwardly (for example, in the X direction and in a direction close to the lens 5) in a radial direction (hereinafter referred to as a radial direction) of the side wall 62 relative to the optical axis. The vibrating body 120 includes, for example, a cylindrical main body 121 and a supporting portion 122 protruding inwardly from the main body 121 in a radial direction.

[0157] It can also be, Figure 13 to Figure 16 As shown, the vibration device 1 includes a stopper 80. The stopper 80 is connected to the fixing portion 35 in a state where the second connecting portion 33 can contact. A first gap 91 is provided between the stopper 80 and the second connecting portion 33 in the first direction Z. The stopper 80 can be formed of any material including metal and resin.

[0158] exist Fig.13 In the vibration device 1 shown in FIG. 1 , the fixing portion 35 has a first opposing surface 351 that is opposed to the second connecting portion 33 with a gap in the first direction Z. The stopper portion 80 is connected to the first opposing surface 351 of the fixing portion 35 . Fig.13 In the vibration device 1 shown, the stopper portion 80 is a member independent of the fixing portion 35 , and is fixed to the fixing portion 35 by adhesive or the like.

[0159] The second connecting portion 33 is composed of a first leaf spring portion 3301, a second leaf spring portion 3302, and a connecting portion 3303. The first leaf spring portion 3301 extends radially outward from an end portion 331 connected to the first connecting portion 31. The fixing portion 35 is located between the first leaf spring portion 3301 and the first opposing surface 351. The second leaf spring portion 3302 extends from an end portion farther from the first connecting portion 31 of both ends in the radial direction of the first leaf spring portion 3301 toward the fixing portion 35 along the first direction Z. A third gap 93 is provided between the fixing portion 35 and the second leaf spring portion 3302. The third gap 93 may not be provided. The connecting portion 3303 extends radially outward from an end portion closer to the fixing portion 35 of both ends in the first direction Z of the second leaf spring portion 3302 along the first opposing surface 351. The radially outer end portion of the connecting portion 3303 constitutes an end portion 332. The second connection portion 33 is connected to the fixing portion 35 via the coupling portion 3303 .

[0160] For example, when an external force is applied to the lens 5 toward the inside of the vibration device 1, the second connection portion 33 moves toward the inside of the vibration device 1 via the first connection portion 31 connected to the lens 5, and contacts the stopper 80. Since the second connection portion 33 contacts the stopper 80, the movement of the second connection portion 33 toward the inside of the vibration device 1 is restricted, and as a result, the movement of the lens 5 toward the inside of the vibration device 1 is restricted. That is, by providing the stopper 80, it is possible to prevent the lens 5 from colliding with a member (for example, the lens module 15) located inside the vibration device 1. In addition, for example, when a stress is applied to the second connection portion 33, the second connection portion 33 contacts the stopper 80, and thus it is possible to prevent the second connection portion 33 from being excessively deformed.

[0161] exist Fig.13 In the vibration device 1 shown, the stopper portion 80 is connected to the first relative surface 351 of the fixing portion 35, thereby more reliably preventing the lens 5 from colliding with components located inside the vibration device 1 (for example, the lens module 15), and more reliably preventing excessive deformation of the second connecting portion 33.

[0162] The first gap 91 has a size that is larger than the maximum amplitude of the lens 5 and smaller than the second gap 92, for example. With this configuration, it is possible to more reliably prevent the lens 5 from colliding with a member (for example, the lens module 15) located inside the vibration device 1, and it is possible to more reliably prevent excessive deformation of the second connection portion 33. The second gap 92 is, for example, the smallest gap among the gaps between the lens 5 and the lens module 15 in the first direction Z.

[0163] exist Fig.14In the vibration device 1 shown, the fixing portion 35 and the stopper 80 are integrally formed. By integrally forming the fixing portion 35 and the stopper 80, it is not necessary to connect the stopper 80 to the fixing portion 35, so that the manufacturing cost of the vibration device 1 can be reduced.

[0164] exist Fig.14 In the vibration device 1 shown, the stopper 80 has an inclined surface 81 that is opposite to the second connection portion 33 in the first direction Z. The inclined surface 81 is inclined in the direction away from the second connection portion 33 in the first direction Z as it approaches the first connection portion 31 in a direction intersecting the first direction Z (for example, the X direction). By providing the inclined surface 81, the area in which the stopper 80 and the first leaf spring portion 3301 of the second connection portion 33 can be contacted can be increased compared to the vibration device 1 in which the stopper 80 does not have the inclined surface 81. As a result, the collision of the lens 5 with the components (for example, the lens module 15) located inside the vibration device 1 can be more reliably prevented, and excessive deformation of the second connection portion 33 can be more reliably prevented.

[0165] exist Fig.15 In the vibration device 1 shown in the figure, the fixing portion 35 has a second opposing surface 352 which is opposed to the internal vibration body 7 with a gap in a direction (for example, X direction) intersecting the first direction Z. The stopper portion 80 is connected to the second opposing surface 352 of the fixing portion 35. Fig.15 In the vibration device 1 shown, the stopper 80 is a member independent of the fixing portion 35 and is fixed to the fixing portion 35 by adhesive or the like. By providing the stopper 80 on the second opposing surface 352, the size of the first gap 91 can be adjusted according to the structure of the vibration device 1 and the material of each member constituting the vibration device 1.

[0166] exist Fig.16 In the vibration device 1 shown, the stopper 80 has a first layer 801 and a second layer 802 stacked in the first direction Z. The first layer 801 is located closer to the second connection portion 33 than the second layer 802. That is, a first gap 91 is formed between the first layer 801 and the first leaf spring portion 3301. The first layer 801 is configured to have an elastic modulus smaller than that of the second layer 802. By configuring in this way, the deformation speed of the second connection portion 33 in contact with the stopper 80 becomes slow, and excessive deformation of the second connection portion 33 can be more reliably prevented. In addition, damage to the second connection portion 33 when the second connection portion 33 contacts the stopper 80 can be prevented.

[0167] For example, Fig.17 As shown in FIG. 1 , the stopper 80 can be configured to have a circular ring shape extending in the circumferential direction relative to the optical axis L of the lens 5. In this case, the fixing portion 35 is configured to surround the internal vibrator 7 around the optical axis L. The stopper 80 is not limited to the case of having a circular ring shape, and can also be, for example, Fig.18 As shown, the structure includes a plurality of components 82 arranged at intervals along the circumferential direction relative to the optical axis L. Alternatively, all of the plurality of components 82 or a portion of the plurality of components 82 may have substantially the same shape and size. Alternatively, all of the plurality of components 82 may have shapes and sizes different from each other. By configuring in this way, it is possible to more reliably prevent the lens 5 from colliding with a component (e.g., the lens module 15) located inside the vibration device 1, and it is possible to more reliably prevent excessive deformation of the second connection portion 33.

[0168] The present disclosure can appropriately combine any of the various embodiments and modifications described above. The combination of the embodiments and / or modifications also includes a combination of the structures included in the embodiments and / or the structures included in the examples.

[0169] The present disclosure is fully described with reference to the accompanying drawings and through the aforementioned embodiments and / or variations, but the aforementioned embodiments and / or variations do not cover all the contents of the present disclosure. As long as the technicians in the technical field of the present disclosure, more modifications and variations can be made. It should be understood that such variations and modifications are included in the present disclosure as long as they do not depart from the scope of the present disclosure.

[0170] Description of Reference Numerals

[0171] 1. Vibration device; 3. External vibrator; 5. Lens; 7. Internal vibrator; 9. Piezoelectric element; 15. Lens module; 31. First connection portion; 31b. Pressing portion; 33. Second connection portion; 3301. First leaf spring portion; 3302. Second leaf spring portion; 3303. Connecting portion; 331, 332. End portion; 35. Fixing portion; 351. First opposing surface; 352. Second opposing surface; 40. First member; 50. Second member; 51. Pressing portion; 60. Pressing member; 61. Pressing portion; 6 2. Side wall; 71. First part; 72. Second part; 73. Third part; 80. Stopper; 81. Inclined surface; 82. Multiple components; 801. First layer; 802. Second layer; 91. First gap; 92. Second gap; 93. Third gap; 100. Part; 120. Vibrating body; 121. Main body; 122. Supporting part; 317. Curved surface; 318. Inclined surface; 319. Pressing surface; 501. Protrusion; 502. Upper surface; 503. Inclined surface; 504. Upper surface.

Claims

1. A vibration device, wherein: The vibration device comprises: vibrating body; a piezoelectric element located at one end of the vibrating body in the first direction; a light-transmitting body located at the other end of the vibrating body in the first direction; A pressing portion, which, together with the other end of the vibrating body, sandwiches the light-transmitting body in the first direction; a first member located between the light-transmitting body and the pressing portion and connected to the light-transmitting body and the pressing portion; and a second member, which is located between the light-transmitting body and the vibrating body and is connected to the light-transmitting body and the vibrating body, The thickness of the first member is greater than or equal to the thickness of the second member.

2. The vibration device according to claim 1, wherein The Young's modulus of the first member is less than or equal to the Young's modulus of the second member.

3. The vibration device according to claim 1 or 2, wherein: The second member includes a material having an adhesive function.

4. The vibration device according to any one of claims 1 to 3, wherein: The first member includes a material having a waterproof function.

5. A vibration device, wherein: The vibration device comprises: vibrating body; a piezoelectric element located at one end of the vibrating body in the first direction; a light-transmitting body located at the other end of the vibrating body in the first direction; A pressing portion, which, together with the other end of the vibrating body, sandwiches the light-transmitting body in the first direction; a first member located between the light-transmitting body and the pressing portion and connected to the light-transmitting body and the pressing portion; and a second member, which is located between the light-transmitting body and the vibrating body and is connected to the light-transmitting body and the vibrating body, The Young's modulus of the first member is less than or equal to the Young's modulus of the second member.

6. The vibration device according to claim 5, wherein: The thickness of the first member is greater than or equal to the thickness of the second member.

7. The vibration device according to claim 5 or 6, wherein: The second member includes a material having an adhesive function.

8. The vibration device according to any one of claims 5 to 7, wherein: The first member includes a material having a waterproof function.

9. The vibration device according to any one of claims 1 to 8, wherein: The vibration device includes an external vibration body and a stopper. The external vibrating body has: a first connecting portion, which is provided with the pressing portion and is connected to the light-transmitting body via the pressing portion; a second connection portion extending from the first connection portion in a direction intersecting the first direction toward a direction away from the light-transmitting body; and a fixing portion connected to an end portion of the second connecting portion, which is opposite to the end portion connected to the first connecting portion, of both ends of the second connecting portion in a direction intersecting the first direction, The stopper is connected to the fixing portion in a state where the second connecting portion can contact the fixing portion. A first gap is provided between the stopper portion and the second connection portion in the first direction.

10. The vibration device according to claim 9, wherein: The stopper portion has an inclined surface facing the second connecting portion in the first direction, The inclined surface is inclined in a direction away from the second connecting portion in the first direction as it approaches the first connecting portion in a direction intersecting the first direction.

11. The vibration device according to claim 9 or 10, wherein: The fixing portion is configured to surround the vibrating body around the optical axis of the light-transmitting body. The stopper has a circular ring shape extending in a circumferential direction relative to the optical axis.

12. The vibration device according to claim 9 or 10, wherein: The fixing portion is configured to surround the vibrating body around the optical axis of the light-transmitting body. The stopper includes a plurality of members located at intervals in a circumferential direction relative to the optical axis.

13. The vibration device according to any one of claims 9 to 12, wherein: The fixing portion and the stopper portion are integrally formed.

14. The vibration device according to any one of claims 9 to 13, wherein: The fixing portion has a first opposing surface that is opposed to the second connecting portion at a distance in the first direction. The stopper is connected to the first opposing surface.

15. The vibration device according to any one of claims 9 to 13, wherein: The fixing portion has a second opposing surface that opposes the vibrating body with a gap in a direction intersecting the first direction. The stopper is connected to the second opposing surface.

16. The vibration device according to any one of claims 9 to 15, wherein: The stopper portion includes a first layer and a second layer stacked in the first direction, The first layer is located closer to the second connection portion than the second layer, and is configured to have an elastic modulus smaller than an elastic modulus of the second layer.

17. The vibration device according to any one of claims 9 to 16, wherein: The vibration device includes a lens module, the lens module is located inside the vibration body and a second gap is provided between the lens module and the light-transmitting body. The first gap has a size that is larger than the maximum amplitude of the light-transmitting body and smaller than the second gap.

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