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JP-7856162-B2 - vibration device

JP7856162B2JP 7856162 B2JP7856162 B2JP 7856162B2JP-7856162-B2

Inventors

  • 田中 佑果
  • 石井 友基
  • 矢後 滋久

Assignees

  • 株式会社村田製作所

Dates

Publication Date
20260511
Application Date
20230606
Priority Date
20220928

Claims (13)

  1. A vibrating body and A piezoelectric element located at one end of the vibrating body in the first direction, A transparent body located at the other end of the vibrating body in the first direction, A pressing portion that clamps the light-transmitting body in the first direction together with the other end of the vibrating body, A first member is located between the light-transmitting body and the pressing portion and is connected to the light-transmitting body and the pressing portion, The system comprises a second member located between the light-transmitting body and the vibrating body, and connected to the light-transmitting body and the vibrating body, A vibrating device in which the thickness of the first member is equal to or greater than 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 adhesive properties.
  4. The vibration device according to claim 1 or 2, wherein the first member includes a material having a waterproof function.
  5. It comprises an external vibrator and a stopper part. The aforementioned external vibrator is The first connecting portion is provided with the aforementioned pressing portion and connected to the light-transmitting body via the aforementioned pressing portion, A second connecting portion extending away from the light-transmitting body in a direction intersecting the first direction from the first connecting portion, The second connecting portion has a fixing portion connected to the end opposite to the end connected to the first connecting portion, at both ends in the direction intersecting the first direction. The stopper portion is connected to the fixing portion in a manner that allows the second connecting portion to make contact. The vibration device according to claim 1 or 2, wherein a first gap is provided between the stopper portion and the second connecting portion in the first direction.
  6. The stopper portion has an inclined surface facing the second connecting portion in the first direction, The vibration device according to claim 5 , wherein the inclined surface is inclined in a direction away from the second connection portion in the first direction as it approaches the first connection portion in a direction intersecting the first direction.
  7. The fixing portion is configured to surround the vibrating body around the optical axis of the light-transmitting body, The vibration device according to claim 5 , wherein the stopper portion has an annular shape extending in the circumferential direction with respect to the optical axis.
  8. The fixing portion is configured to surround the vibrating body around the optical axis of the light-transmitting body, The vibration device according to claim 5 , wherein the stopper portion includes a plurality of members positioned at intervals along the circumferential direction with respect to the optical axis.
  9. The vibration device according to claim 5 , wherein the fixing portion and the stopper portion are integrally configured.
  10. The fixing portion has a first opposing surface that faces the second connecting portion at a distance from it in the first direction, The vibration device according to claim 5 , wherein the stopper portion is connected to the first opposing surface.
  11. The fixing portion has a second opposing surface that is spaced apart from the vibrating body in a direction intersecting the first direction, The vibration device according to claim 5 , wherein the stopper portion is connected to the second opposing surface.
  12. The stopper portion has a first layer and a second layer stacked in the first direction, The vibration device according to claim 5 , wherein the first layer is located closer to the second connection than the second layer and is configured to have a lower modulus of elasticity than the second layer.
  13. The lens module is located inside the vibrating body and has a second gap between it and the light-transmitting body, The vibration device according to claim 5 , wherein the first gap has a size greater than or equal to the maximum amplitude of the light-transmitting material and less than the second gap.

Description

This disclosure relates to a vibration device. Patent Document 1 discloses a droplet removal device comprising an optical element with a dome portion, an excitation member that generates bending vibrations in the dome portion, a vibration control device that controls the excitation member, and a droplet-proof seal that suppresses the ingress of droplets into the interior. Japanese Patent Publication No. 2017-170303 A perspective view showing a vibrator according to one embodiment of the present disclosure.A cross-sectional view along line II-II in Figure 1.A partially enlarged view of Figure 2 to illustrate the first component.A partially enlarged view of Figure 2 to illustrate the second component.A graph showing the relationship between the thickness of the first and second members and the maximum displacement of the lens top.A graph showing the relationship between the thickness of the first and second components and the maximum thermal stress applied to the lens.A contour map showing the thermal stress on the lens.A graph showing the relationship between the Young's modulus of the first and second members and the maximum displacement of the lens top.A graph showing the relationship between the Young's modulus of the first and second components and the maximum thermal stress applied to the lens.A cross-sectional view showing a first modified example of the vibration device in Figure 1.A cross-sectional view showing a second modified example of the vibration device in Figure 1.A cross-sectional view showing a third modified example of the vibration device in Figure 1.A cross-sectional view showing a fourth modified example of the vibration device in Figure 1.A cross-sectional view showing a fifth modified example of the vibration device in Figure 1.A cross-sectional view showing a sixth modified example of the vibration device in Figure 1.A cross-sectional view showing a seventh modified example of the vibration device in Figure 1.A cross-sectional view along the line XVII-XVII in Figure 13.A cross-sectional view showing an eighth modified example of the vibration device in Figure 1. Various aspects of this disclosure will be described below. A vibration device according to a first aspect of this disclosure is A vibrating body and A piezoelectric element located at one end of the vibrating body in the first direction, A transparent body located at the other end of the vibrating body in the first direction, A pressing portion that clamps the light-transmitting body in the first direction together with the other end of the vibrating body, A first member is located between the light-transmitting body and the pressing portion and is connected to the light-transmitting body and the pressing portion, The system comprises 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 equal to or greater than the thickness of the second member. According to the first embodiment of the vibrating device, the first and second members act as buffer layers that dampen thermal stress caused by the difference in the coefficients of linear expansion of each member of the translucent body, vibrating body, and pressing part. Therefore, the reliability of the joint between the translucent body and the vibrating body, as well as the reliability of the joint between the translucent body and the pressing part, can be improved. A second aspect of the present disclosure is a vibration device in the first aspect, The Young's modulus of the first member is less than or equal to the Young's modulus of the second member. According to the second embodiment of the vibrating device, the reliability of the joint between the light-transmitting body and the vibrating body, as well as the reliability of the joint between the light-transmitting body and the pressing part, can be more reliably improved. A third aspect of the present disclosure is a vibration device in which, in the first or second aspect, The second member includes a material having adhesive properties. According to the third embodiment of the vibration device, vibration damping of the vibration device can be suppressed more reliably. A fourth aspect of the present disclosure is a vibration device in any of the first to third aspects, The first member includes a material having a waterproofing function. According to the fourth embodiment of the vibrating device, the ingress of liquid droplets into the interior of the vibrating device can be more reliably suppressed. A fifth aspect of the present disclosure is a vibrating device. A vibrating body and A piezoelectric element located at one end of the vibrating body in the first direction, A transparent body located at the other end of the vibrating body in the first direction, A pressing portion that clamps the light-transmitting body in the first direction together with the other end of the vibrating