WO2020003574A1 - Dispositif d'oscillation et dispositif de détection optique - Google Patents

Dispositif d'oscillation et dispositif de détection optique Download PDF

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Publication number
WO2020003574A1
WO2020003574A1 PCT/JP2019/002548 JP2019002548W WO2020003574A1 WO 2020003574 A1 WO2020003574 A1 WO 2020003574A1 JP 2019002548 W JP2019002548 W JP 2019002548W WO 2020003574 A1 WO2020003574 A1 WO 2020003574A1
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WO
WIPO (PCT)
Prior art keywords
vibration
light transmitting
vibrating
transmitting body
vibrating body
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PCT/JP2019/002548
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English (en)
Japanese (ja)
Inventor
藤本　克己
西山　健次
倉谷　康浩
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株式会社村田製作所
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Publication of WO2020003574A1 publication Critical patent/WO2020003574A1/fr

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    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/02—Bodies
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B17/00—Details of cameras or camera bodies; Accessories therefor
    • G03B17/56—Accessories

Definitions

  • the present invention relates to a vibration device and an optical detection device capable of removing water droplets and the like by mechanical vibration.
  • Patent Literature 1 discloses a vibration device having a light-transmitting portion disposed in front of a camera body. In this vibrating device, water droplets adhering to the light transmitting portion are atomized by vibrating the light transmitting portion largely. Patent Literature 1 describes that a water droplet can be moved to a hydrophilic portion side by forming a hydrophilic portion other than a region to be photographed.
  • antinodes of vibration and nodes of vibration are formed in a portion of the translucent portion located in the visual field region of the camera body.
  • the water droplet moves toward the antinode of the vibration, and the water droplet is atomized near the antinode of the vibration.
  • the water droplet located at the node of the vibration is hard to move toward the antinode of the vibration. For this reason, water droplets may remain and the field of view of the camera body may be obstructed.
  • An object of the present invention is to provide a vibration device and an optical detection device that can more reliably secure a detection area of an optical detection element.
  • a vibration device includes a light-transmitting member disposed so as to include at least a part of a detection region of an optical detection element, and a vibration device disposed such that an optical axis of the light-transmitting member is inclined from a vertical direction. And a vibrating element having a vibrating body directly or indirectly connected to the translucent body, wherein the hydrophilic film is provided at least in a portion including the detection region in the translucent body.
  • a control unit electrically connected to the vibrating element, wherein the control unit controls the vibration in a first control mode in which the vibrating element alternately switches between vibration and rest.
  • the optical detection device includes a vibration device configured according to the present invention, and an optical detection element arranged so that the light transmitting body includes a detection region.
  • FIG. 1 is a schematic perspective view of an imaging device having a vibration device according to the first embodiment of the present invention.
  • FIG. 2 is a schematic front sectional view of an imaging device having the vibration device according to the first embodiment of the present invention.
  • FIG. 3 is a schematic perspective view of the piezoelectric vibrator according to the first embodiment of the present invention.
  • FIG. 4 is a schematic diagram for explaining each vibration mode.
  • FIG. 5 is a diagram showing a relationship between the excitation frequency f of the capillary wave and the wavelength ⁇ .
  • FIGS. 6A to 6D show a vibration device according to the first embodiment of the present invention for explaining the behavior of a droplet such as a water droplet when the vibration is controlled by the first control mode.
  • FIG. 3 is a schematic plan view of FIG. FIGS.
  • FIG. 7A to 7C are schematic perspective views illustrating an example of the polarization structure of the piezoelectric body according to the first embodiment.
  • FIG. 8 is a schematic front sectional view of a vibration device according to a second embodiment of the present invention.
  • FIG. 9 is a schematic cross-sectional view illustrating a state of vibration of the vibrating body according to the second embodiment of the present invention in the second control mode.
  • FIG. 10 is a schematic perspective view of a light transmitting body and a case member according to the third embodiment of the present invention.
  • FIG. 11 is a schematic partially cutaway perspective view of the vibration device according to the third embodiment of the present invention.
  • FIG. 12 is a schematic partial cutaway perspective view of a vibrating body according to a first modification of the third embodiment of the present invention.
  • FIG. 13 is a schematic perspective view of a case member according to a second modification of the third embodiment of the present invention.
  • FIG. 14 is a schematic partial cutaway perspective view of a vibrating body according to a second modification of the third embodiment of the present invention.
  • FIG. 15 is a perspective view schematically illustrating a vibrating body according to a third modification of the third embodiment of the present invention.
  • FIG. 1 is a schematic perspective view of an imaging device having the vibration device according to the first embodiment.
  • FIG. 2 is a schematic front sectional view of an imaging device having the vibration device according to the first embodiment.
  • a control unit described later may be omitted.
  • the vibration device 1 is a vibration device that removes water droplets and foreign matter from the field of view of the image sensor by moving water droplets and foreign matter by vibration.
  • the vibration device 1 includes a vibration element 2 including a cylindrical vibration body 3, a light transmitting body 4 provided to cover an opening of the vibration element 2, and an electric And a control unit 12 that is electrically connected.
  • a hydrophilic film 5 is provided on the entire surface of the light transmitting body 4.
  • the entire surface of the light transmitting body 4 refers to the entire outer surface of the vibrating device 1 that transmits light and energy rays.
  • the vibration device 1 is arranged so that the optical axis L of the light transmitting body 4 is inclined from the vertical direction. More specifically, in the present embodiment, the vibration device 1 is arranged such that the optical axis L of the light transmitting body 4 is orthogonal to the vertical direction. When the vibration device 1 is arranged to be inclined at an angle of 45 ° or more with respect to the vertical direction, water droplets and the like can be particularly preferably removed from the light transmitting member 4.
  • the imaging device 10 includes a cylindrical case member 18 that supports the vibration device 1 at one end, and a base member 14 that is fixed to the other end of the case member 18.
  • An image sensor 10A is arranged in an internal space surrounded by the vibration device 1, the case member 18, and the base member 14. Thereby, an imaging device 10 as an optical detection device according to one embodiment of the present invention is configured.
  • the imaging element 10A for example, a CMOS, a CCD, a bolometer, a thermopile, or the like that receives light of any wavelength from the visible region to the far infrared region can be used.
  • the imaging device 10 include a camera, a Radar and a LIDAR device, and the like.
  • the case member 18 is fixed on the base member 14.
  • a plurality of legs 15 are fixed on the base member 14.
  • a board 16 is fixed on the plurality of legs 15.
  • the image sensor 10A is fixed on the substrate 16.
  • the imaging device 10A has an imaging device body 10a and a lens module 10b. The portion on the lens module 10b side of the imaging element 10A is located in the internal space of the vibration device 1, and the remaining portion is located in the internal space of the case member 18. Note that the entire imaging element 10A may be located in the internal space of the vibration device 1.
  • a circuit for driving the image sensor 10A and the control unit 12 are provided on at least one main surface of the substrate 16 or one main surface of the base member 14.
  • an optical detection element other than the imaging element 10A for optically detecting an energy ray may be arranged.
  • the energy ray to be detected may be, for example, an active energy ray such as an electromagnetic wave or an infrared ray.
  • a field of view as a detection region of the imaging element 10 ⁇ / b> A is included in the light transmitting body 4.
  • the light transmitting body 4 only needs to be disposed so as to include at least a part of the field of view of the imaging element 10A.
  • the term "light-transmitting property" in the present specification refers to a light-transmitting property at which an energy ray or light having a wavelength detected by the optical detection element is transmitted.
  • the imaging device 10 shown in FIGS. 1 and 2 is an example, and the configuration of the imaging device 10 is not limited to the above.
  • the imaging device 10 only needs to include the vibration device 1 and the imaging element 10A.
  • the vibration element 2 has a vibration body 3 and a piezoelectric vibrator 7.
  • the vibrating body 3 is substantially cylindrical and has a first open end 3a and a second open end 3b.
  • the direction parallel to the direction connecting the first opening end 3a and the second opening end 3b is defined as the height direction of the vibration device 1, and the direction orthogonal to the height direction is defined as the radial direction.
  • the vibrating body 3 has an extension 3c located on the first opening end 3a side and extending radially inward. The portion of the extension 3c on the light transmitting body 4 side is included in the first opening end 3a.
  • the light transmitting member 4 is connected to a portion of the first opening end 3a located at the extension 3c so as to cover the opening of the vibrating member 3.
  • the vibrating body 3 has a hinge 3d located between the first open end 3a and the second open end 3b.
  • the hinge 3d extends radially outward.
  • the vibration device 1 is supported by the case member 18 at the hinge 3d.
  • the thickness in the radial direction of the vibrating body 3 is a thickness
  • the thickness of the portion located between the hinge 3d and the extension 3c is the thickness of the hinge 3d and the second opening end. 3b.
  • the vibrating body 3 may not have the hinge portion 3d and the extension portion 3c, and the thickness of the vibrating body 3 may be the same in all portions.
  • the vibrating body 3 may have a cylindrical shape.
  • the vibrating body 3 may have a cylindrical shape or a rectangular cylindrical shape.
  • the piezoelectric vibrator 7 is disposed at the second opening end 3 b of the vibrating body 3.
  • the piezoelectric vibrator 7 vibrates the connected body of the light transmitting body 4 and the vibrating body 3.
  • FIG. 3 is a schematic perspective view of the piezoelectric vibrator according to the first embodiment.
  • the piezoelectric vibrator 7 has an annular piezoelectric body 8.
  • the piezoelectric body 8 is made of, for example, an appropriate piezoelectric ceramic such as Pb (Zr, Ti) O 3 or (K, Na) NbO 3 or an appropriate piezoelectric single crystal such as LiTaO 3 or LiNbO 3 .
  • An electrode 9a is provided on one main surface of the piezoelectric body 8, and an electrode 9b is provided on the other main surface.
  • one annular piezoelectric vibrator 7 is disposed on the vibrating body 3.
  • the shape and the number of the piezoelectric vibrators 7 are not limited to the above.
  • a plurality of piezoelectric vibrators may be arranged along a circumferential direction with the center of the vibrating body 3 as a rotation axis.
  • the light transmitting body 4 is directly connected to the vibrating body 3. Note that the light transmitting body 4 may be indirectly connected to the vibrating body 3 via another member.
  • the light transmitting body 4 has a dome shape in the present embodiment.
  • the shape of the light transmitting body 4 is not limited to the above, and may be, for example, a disk shape.
  • the light transmitting body 4 is made of a light transmitting material.
  • As the light-transmitting material for example, a light-transmitting resin, glass, or a light-transmitting ceramic can be used.
  • the hydrophilic film 5 is provided on the entire surface of the light transmitting body 4. Note that the hydrophilic film 5 only needs to be provided at least in a portion including the visual field of the imaging element 10A.
  • the material of the hydrophilic film 5 include TiO 2 for an inorganic type and hydrophilic PVDF for an organic type.
  • the control unit 12 is electrically connected to the vibration element 2. More specifically, the control unit 12 is electrically connected to the piezoelectric vibrator 7.
  • the control unit 12 controls the vibration of the connected body of the light transmitting body 4 and the vibrating body 3 by the piezoelectric vibrator 7.
  • the control unit 12 vibrates the connected body of the light transmitting body 4 and the vibrating body 3 so that the node of the vibration is located at the hinge 3d of the vibrating body 3.
  • the vibration device 1 can be easily supported by the case member 18, and the sealing property of the imaging device 10 can be improved.
  • the support of the case member 18 makes it difficult to hinder the vibration of the vibration device 1.
  • the control unit 12 of the vibration device 1 controls the vibration by the first control mode in which the vibration of the vibration element 2 and the stationary state are alternately switched.
  • the hydrophilic film 5 is provided on the entire surface of the light transmitting body 4 and that the control unit 12 controls the vibration in the first control mode. Thereby, the visual field of the imaging element 10A as a detection area of the optical detection element can be more reliably secured. This will be described below.
  • FIG. 4 is a schematic diagram for explaining each vibration mode.
  • FIG. 4 shows the phase of vibration of each region in the light transmitting body when viewed in plan.
  • the region marked with a + sign and the region marked with a-sign indicate that the phases of vibration are opposite to each other.
  • the vibration mode can be represented by the (m, n) mode.
  • m and n are integers.
  • m is the number of vibration node lines extending in the circumferential direction
  • n is the number of vibration node lines extending in the radial direction.
  • the (0,0) mode is used.
  • the piezoelectric vibrator 7 of the vibration device 1 is configured to be able to excite the (0, 0) mode vibration in the light transmitting body 4.
  • the (0, 0) mode vibration is excited by controlling the voltage and the like applied to the piezoelectric vibrator 7 by the control unit 12.
  • the hydrophilic film 5 is provided on the entire surface of the light transmitting body 4. Therefore, even if the light transmitting member 4 is vibrated, water droplets and the like are hardly atomized. This is considered for the following reasons.
  • the atomization of the droplet by the vibration is due to the fact that the standing wave of the capillary wave is excited, a part of the droplet becomes columnar, and the tip of the columnar portion scatters.
  • the wavelength of the capillary wave is ⁇
  • the excitation frequency is f
  • the surface tension of the droplet is ⁇
  • the density of the droplet is ⁇
  • FIG. 5 is a diagram showing the relationship between the excitation frequency f of the capillary wave and the wavelength ⁇ .
  • the wavelength ⁇ of the capillary wave becomes about 10 ⁇ m, which indicates that the fog is close to a gas.
  • a droplet such as a water droplet spreads on the surface of the hydrophilic film immediately after adhering to the hydrophilic film and becomes a liquid film.
  • the liquid film spreads further, and the liquid film becomes thinner.
  • the frequency at which the vibrating body of the vibrating device for atomizing the droplets is excited is generally about 50 kHz.
  • the wavelength ⁇ of the capillary wave is about 90 ⁇ m when the excitation frequency f is about 50 kHz.
  • the thickness of the liquid film is smaller than the wavelength ⁇ of the capillary wave, the standing wave of the capillary wave is hardly excited. Therefore, the liquid on the hydrophilic film is not easily atomized.
  • FIGS. 6A to 6D are schematic diagrams of the vibration device according to the first embodiment for explaining the behavior of a droplet such as a water droplet when the vibration is controlled by the first control mode. It is a top view.
  • the first control mode is a control mode for alternately switching the vibration and the rest of the vibration element 2.
  • the light transmitting body 4 shown in FIG. 6A is vibrating in the (0,0) mode in which the antinode of vibration is located at the center.
  • the droplets A move toward the center of the light transmitting body 4 where the antinode of vibration is located and gather.
  • the light transmitting body 4 is stopped by the control unit 12. As a result, a force for moving the droplet A toward the center of the light transmitting member 4 is not applied to the droplet A.
  • the droplets A are gathered and integrated near the center of the light transmitting body 4, the gravity applied to the droplets A increases. Therefore, the droplet A hangs down as shown in FIG. Next, as shown in FIG. 6D, the droplet A hangs down below the light transmitting body 4. Even in the case where foreign matter is included together with the droplet A, the foreign matter can hang down together with the integrated droplet A. Thereby, the droplets A and the like can be removed from the light transmitting member 4.
  • the liquid may vibrate as in the case shown in FIG. It gathers in the part located on the belly, and the liquid film becomes thick in this part. Next, as in the case shown in FIGS. 6C and 6D, the liquid hangs down.
  • the hydrophilic film 5 is preferably wider than the field of view. Therefore, the dropping of the droplet A can be performed more reliably.
  • a vibration mode other than the (0, 0) mode is used.
  • a vibration mode such as a (0, 1) mode or a (0, 2) mode may be used.
  • FIGS. 7A to 7C are schematic perspective views illustrating an example of the polarization structure of the piezoelectric body according to the first embodiment.
  • a region with a + sign indicates a region in which the polarization direction is from the lower surface to the upper surface in FIG. 7A of the piezoelectric body.
  • a region with a minus sign indicates that the polarization direction is a direction from the upper surface to the lower surface of the piezoelectric body.
  • FIGS. 7B and 7C The same applies to FIGS. 7B and 7C.
  • FIG. 7A the polarization directions of the regions arranged in the circumferential direction are all the same.
  • the electrodes 9a and 9b of the piezoelectric vibrator 7 shown in FIG. 3 are annular. Therefore, when the piezoelectric body 8 having the polarization structure shown in FIG. 7A is used, (0, 0) mode vibration is excited in the light transmitting body 4.
  • FIG. 7B in the region divided into four in the circumferential direction, the polarization directions of the regions on both sides facing each other via the center are opposite.
  • the piezoelectric body 8 having the polarization structure shown in FIG. 7B is used, the (0, 1) mode vibration is excited in the light transmitting body 4.
  • FIG. 7A the electrodes 9a and 9b of the piezoelectric vibrator 7 shown in FIG. 3 are annular. Therefore, when the piezoelectric body 8 having the polarization structure shown in FIG. 7A is used, (0, 0) mode vibration is excited in the light transmitting body 4.
  • FIG. 7B in the region
  • the electrode 9a and the electrode 9b shown in FIG. 3 may be divided in the circumferential direction, and the divided electrodes may be arranged in the above-described regions of the piezoelectric body 8.
  • the AC voltages having phases opposite to each other are applied to the regions on both sides opposed to each other with the center therebetween.
  • the (0, 1) mode vibration can be excited.
  • the (0, 2) mode vibration can be excited in the light transmitting member 4 by applying an AC voltage having the same phase to both regions facing each other via the center.
  • the antinode of the vibration can be located at a portion not including the optical axis L of the light transmitting body 4. Thereby, even when water droplets and the like are gathered near the antinode of vibration, it is possible to suppress the obstruction of the visual field of the image sensor 10A.
  • the control unit 12 controls the vibration so that the antinode of the vibration is located in a portion located in the region outside the field of view.
  • the field of view of the imaging element 10A is located only near the center of the light transmitting body 4, it is preferable to use the (0, 1) mode or the (0, 2) mode in the first control mode. It is. Thereby, the field of view of the imaging element 10A is hardly hindered.
  • the control unit 12 controls the vibration in the light transmitting body 4 so that a plurality of antinodes of the vibration are positioned in the vertical direction.
  • antinode of the vibration is preferably located outside the central region of the light transmitting body 4.
  • FIG. 8 is a schematic front sectional view of the vibration device according to the second embodiment.
  • the present embodiment is different from the first embodiment in that a connecting member 26 connecting the vibrating body 23 and the light transmitting body 4 is provided. Further, the configuration of the vibrating body 23 and the control mode used are different from those of the first embodiment. Except for the above points, the vibration device of the present embodiment has the same configuration as the vibration device 1 of the first embodiment.
  • the light transmitting member 4 is fixed to the connecting member 26.
  • the connecting member 26 has a tubular portion 26a and a flange portion 26b extending radially outward from one end of the tubular portion 26a.
  • the light transmitting body 4 is fixed to one surface of the flange portion 26b.
  • the other end of the cylindrical portion 26a is fixed to the vibrating body 23.
  • the light transmitting member 4 is indirectly connected to the vibrating member 23 via the connecting member 26.
  • the translucent member 4 may be directly connected to the first flange portion 23d of the vibrating member 23 without using the connecting member 26.
  • the first flange portion 23 d is directly connected to and integrated with the light transmitting body 4, and both are oscillated at different frequencies by the vibration of the vibrating body 3.
  • the vibrating body 23 has an outer surface 23g and an inner surface 23h that connect the first open end 3a and the second open end 3b.
  • the vibrating body 23 is provided with an annular support portion 23c extending radially inward from an inner side surface 23h of the vibrating body 23.
  • the cylindrical portion 26a of the connecting member 26 is fixed to the support portion 23c.
  • the light transmitting body 4 is connected to the vibrating body 23 by the connecting member 26.
  • the support portion 23c need not be annular.
  • the vibrating body 23 is usually cylindrical except for the first flange 23d, but may be provided with a second flange 23e and a third flange 23f.
  • the first flange portion 23d, the second flange portion 23e, and the third flange portion 23f have an annular shape extending radially outward from an outer surface 23g of the vibrating body 23.
  • the vibrating body 23 has a tripod tuning fork shape in a cross section along the radial direction and the height direction of the vibrating body 23 shown in FIG.
  • the outer diameters of the first flange portion 23d, the second flange portion 23e, and the third flange portion 23f are made equal.
  • the outer diameters of the first flange portion 23d, the second flange portion 23e, and the third flange portion 23f do not necessarily have to be equal.
  • the first flange portion 23d is provided along the first opening end 3a, and the second flange portion 23e is provided along the second opening end 3b.
  • the first flange portion 23d may be located closer to the second opening end 3b in the height direction than the first opening end 3a.
  • the second flange 23e may also be located closer to the first opening end 3a than the second opening end 3b.
  • control unit 12 controls the vibration in the second control mode.
  • the second control mode is a mode in which the vibration is controlled such that the amplitude of the vibrating body 23 is larger than the amplitude of the light transmitting body 4.
  • FIG. 9 is a schematic cross-sectional view illustrating a state of vibration of the vibrating body in the second embodiment in the second control mode.
  • the solid line indicates a vibrating state
  • the dashed line indicates the original state.
  • the vibrator 23 has a plurality of resonance frequencies.
  • a resonance frequency of a vibration mode in which the first flange portion 23d and the second flange portion 23e are displaced in opposite phases in the height direction is selected.
  • Antinodes of vibration in the vibrating body 23 are located at outer peripheral edges of the first flange portion 23d and the second flange portion 23e.
  • the outer peripheral edge refers to the outer peripheral edge viewed from the height direction.
  • a portion between the first flange portion 23d and the second flange portion 23e is a node of vibration.
  • the support portion 23c is located between the first flange portion 23d and the second flange portion 23e in the height direction.
  • the support part 23c is located near the node of the vibration.
  • the light transmitting body 4 is connected to the support portion 23c via a connecting member 26. Therefore, in the second control mode, the amplitude of the vibration of the vibrating body 23 is larger than the amplitude of the vibration of the light transmitting body 4.
  • control may be performed such that the light transmitting body 4 does not vibrate and only the vibrating body 23 vibrates. For example, when the support portion 23c is accurately arranged at a node of the vibration, the light transmitting body 4 does not easily vibrate.
  • Water droplets and the like attached to the light transmitting body 4 hang down due to gravity. Water droplets and the like reaching the first flange portion 23d from the light transmitting member 4 via the flange portion 26b of the connecting member 26 are scattered outside the first flange portion 23d by the vibration of the first flange portion 23d. Or atomized. Thereby, water droplets and the like can be more reliably removed from the translucent member 4, and the field of view of the imaging device 10A can be more reliably secured.
  • the light-transmitting member 4 may be made of various light-transmitting materials, but may be made of a resin.
  • the cost can be reduced.
  • the mechanical Q is low, so that it is difficult to vibrate. Therefore, when atomization is performed only in the second control mode without using the first control mode, the light transmitting body 4 may be made of resin, and cost reduction can be realized.
  • the control unit 12 alternately switches between the first control mode and the second control mode.
  • the first control mode allows the water droplets and the like attached to the light transmitting body 4 to drop more reliably, as in the first embodiment. Water drops or the like hanging down from the light transmitting body 4 can be atomized by the second control mode. This makes it difficult for water droplets and the like to remain vertically downward.
  • water droplets and the like can be more reliably and quickly drooped from the light transmitting member 4, and drainage from the light transmitting member 4 is enhanced. be able to.
  • water droplets and the like can be more reliably removed, and the visual field of the image sensor 10A can be removed. Can be more reliably ensured.
  • a water-repellent film is provided on the first flange portion 23d. Thereby, water droplets and the like can be more easily atomized.
  • the resonance frequency of the vibration of the first flange portion 23d and the resonance frequency of the vibration of the second flange portion 23e are made substantially equal.
  • the two resonance frequencies are equal. Therefore, the node of the vibration is located at the center of the vibration body 23 in the height direction.
  • the third flange portion 23f is located at the center between the first flange portion 23d and the second flange portion 23e. Therefore, the third flange portion 23f is located at a node of vibration. Since the third flange portion 23f is supported by the case member 18 shown in FIG. 2, the vibration is hardly hindered.
  • the region of the node of vibration is the height of the vibrating body 23. It may be shifted from the center in the height direction to the first opening end 3a side or the second opening end 3b side. In that case, it is preferable to dispose the third flange portion 23f at a position serving as a node of vibration.
  • the third flange portion 23f does not necessarily have to be arranged exactly at the node of the vibration.
  • the tuning fork-shaped cross-sectional shape formed by the first to third flange portions 23d to 23f is not particularly limited.
  • the cross-section of the tuning fork may be a two-legged, a three-legged, a four-legged, or a five-legged or more.
  • at least the first flange portion 23d and the second flange portion 23e may be provided on the outer surface 23g of the vibrating body 23.
  • the vibrator 23 may have a tuning fork shape of two or more legs in cross section, and may have an outer surface shape obtained by rotating the tuning fork shape of two or more legs with respect to the center axis of the cylindrical body.
  • FIG. 10 is a schematic perspective view of a light transmitting body and a case member according to the third embodiment.
  • FIG. 11 is a perspective view of the vibration device according to the third embodiment, which is schematically cut away.
  • the vibration device of the present embodiment includes a case member 38, and the light transmitting body 34 is directly joined to the case member 38.
  • the case member 38 is a peripheral member joined to the light transmitting body 34.
  • the light transmitting body 34 is a lens of the image sensor.
  • the hydrophilic film 5 is provided on the entire surface of the light transmitting body 34.
  • a circular opening 38a is provided on the surface of the case member 38 to which the translucent member 34 is joined.
  • the opening 38a is provided with a gap from the light transmitting body 34 in a plan view.
  • the vibration element 32 shown in FIG. 11 is arranged so as to seal the opening 38a.
  • the vibration element 32 may be provided at a position that does not overlap the light transmitting body 34 in a plan view.
  • the vibrating body 33 of the vibrating element 32 is indirectly connected to the light transmitting body 34 via a case member 38.
  • the vibration element 32 causes the case member 38 to vibrate.
  • the vibration element 32 has a vibration body 33 and the piezoelectric vibrator 7.
  • the vibrating body 33 has a first vibrating body part 33A, a second vibrating body part 33B, and a third vibrating body part 33C.
  • the second vibrating part 33B is cylindrical and has a first open end 33a and a second open end 33b.
  • the first vibrating body part 33A has a disk shape, and seals the first opening end 33a of the first vibrating body part 33A.
  • the third vibrating body part 33C is annular, and is connected to the second opening end 33b of the second vibrating body part 33B.
  • Each vibrating part may be formed separately and joined, or each vibrating part may be formed integrally.
  • the first vibrator 33A has a first flange 33d extending radially outward from a portion connected to the second vibrator 33B.
  • the thickness of the first flange portion 33d is smaller than the thickness of the first vibrating body portion 33A.
  • the third vibrating body part 33C has a second flange part 33e extending radially outward from a portion connected to the second vibrating body part 33B.
  • the thickness of the second flange 33e is the same as the thickness of the third vibrator 33C.
  • the second flange 33e is longer than the first flange 33d.
  • the piezoelectric vibrator 7 of the vibration element 32 is the same piezoelectric vibrator as in the first embodiment.
  • the piezoelectric vibrator 7 is arranged on a third vibrating body portion 33C of the vibrating body 33.
  • the control unit 12 controls the vibration in the second control mode in addition to the control in the first control mode. That is, control is performed in the first control mode or the second control mode.
  • the control of vibration in the first control mode is the same as in the first and second embodiments.
  • the control unit 12 controls the vibration so that, for example, the antinode of the vibration is located in the first vibrating body 33A of the vibrating body 33.
  • the vibration of the vibration element 32 propagates to the case member 38.
  • water droplets and the like that hang down below the light transmitting body 34 and are located near the outer peripheral edge of the light transmitting body 34 can be moved more reliably to the vibration element 32 side.
  • Water droplets and the like remaining between the light transmitting body 34 and the vibration element 32 can also be moved to the vibration element 32 side, and it is difficult to hinder the dripping of the water droplets and the like from the light transmitting body 34. Therefore, water droplets and the like can be more reliably removed from the light transmitting body 34, and the field of view of the image sensor can be more reliably secured.
  • the configuration of the vibration element and the shape of the opening of the case member are not limited to the above.
  • first to third modified examples of the third embodiment will be described. Also in the first to third modifications, similarly to the third embodiment, the field of view of the image sensor can be more reliably secured.
  • the vibrating body 43 includes a disk-shaped first vibrating body 43A and a cylindrical second vibrating body 43B, and has a third vibrating body. do not do.
  • the first vibrator 43A does not have a flange.
  • the piezoelectric vibrator 7 is arranged in the first vibrator 43A, and is located in an internal space surrounded by the first vibrator 43A and the second vibrator 43B.
  • the vibrating body 53 of the second modification includes a first vibrating body 53A having a rectangular plate shape and a second vibrating body 53B having a rectangular tube shape.
  • the second vibrating body 53B has a first side 53a, a second side 53b, a third side 53c, and a fourth side 53d.
  • the first side face 53a and the third side face 53c face each other and are connected to the long side of the first vibrating body 53A.
  • the second side face 53b and the fourth side face 53d face each other and are connected to the short side of the first vibrating body 53A.
  • the piezoelectric body of the piezoelectric vibrator 57 of the present modification has a rectangular plate shape. Electrodes are provided on both main surfaces of the piezoelectric body, respectively.
  • the vibration element 52 has two piezoelectric vibrators 57. One piezoelectric vibrator 57 is disposed on the first side surface 53a of the second vibrator 53B, and the other piezoelectric vibrator 57 is disposed on the third side surface 53c.
  • the vibrating body 63 of the third modified example includes a first vibrating body part 63A and a second vibrating body part 63B, as in the second modified example.
  • the planar shape of the first vibrating body 63A is a square
  • the second vibrating body 63B is a rectangular tube.
  • the vibration element 62 has four piezoelectric vibrators 57 similar to those of the second modification. Each of the piezoelectric vibrators 57 is provided on the first side surface 63a, the second side surface 63b, the third side surface 63c, and the fourth side surface 63d of the second vibrating body 63B.
  • Vibration Body 23c Support portions 23d to 23f First to third flange portions 23g Outside surface 23h Inner surface 26 Connecting member 26a Cylindrical portion 26b Flange portion 32 Vibrating element 33 Vibrating body 33A to 33C First to third vibrating body portions 33a, 33b: first and second opening end portions 33d, 33e: first and second flange portions 34: light transmitting member 38: case member 38a: opening portion 43: vibration Body 43A, 43B ...
  • first Second vibrating body portion 52 Vibrating element 53 Vibrating bodies 53A and 53B First and second vibrating body portions 53a to 53d First to fourth side surfaces 57

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Studio Devices (AREA)

Abstract

La présente invention vise à produire un dispositif d'oscillation pouvant garantir de manière plus fiable la zone de détection d'un élément de détection optique. L'invention concerne un dispositif d'oscillation 1 qui comprend un corps de transmission de lumière 4 conçu pour comprendre au moins une partie de la zone de détection d'un élément de capture d'image 10A (élément de détection optique) et dans lequel l'axe optique L du corps de transmission de lumière 4 est disposé obliquement par rapport à la direction verticale, ledit dispositif d'oscillation comprenant en outre : une membrane hydrophile 5 disposée sur une partie du corps de transmission de lumière 4 qui comprend au moins la zone de détection ; un élément d'oscillation 2 ayant un corps oscillant 3 relié directement ou indirectement au corps de transmission de lumière 4 ; et un dispositif de commande 12 relié électriquement à l'élément d'oscillation 2. Le dispositif de commande 12 commande l'élément d'oscillation 2 dans un premier mode où l'élément d'oscillation alterne entre oscillation et non-oscillation.
PCT/JP2019/002548 2018-06-28 2019-01-25 Dispositif d'oscillation et dispositif de détection optique WO2020003574A1 (fr)

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JP2018123353 2018-06-28
JP2018-123353 2018-06-28

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WO2020003574A1 true WO2020003574A1 (fr) 2020-01-02

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113767616A (zh) * 2020-03-27 2021-12-07 株式会社村田制作所 振动装置和振动控制方法
WO2023153017A1 (fr) * 2022-02-10 2023-08-17 株式会社村田製作所 Dispositif de vibration et dispositif d'imagerie

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007189802A (ja) * 2006-01-12 2007-07-26 Canon Inc 振動波駆動装置及び振動波駆動機器
JP2009265473A (ja) * 2008-04-28 2009-11-12 Konica Minolta Opto Inc レンズ、撮像レンズ及び撮像装置
JP2013080177A (ja) * 2011-10-05 2013-05-02 Aisin Seiki Co Ltd 水滴除去機能付カメラ
JP2015231216A (ja) * 2014-06-06 2015-12-21 株式会社タムロン 光学ユニット及び車載用撮像装置
JP2017170303A (ja) * 2016-03-22 2017-09-28 オリンパス株式会社 液滴排除装置と、液滴排除装置を有する画像装置及び上記液滴排除装置の制御方法と上記液滴排除装置の制御プログラム
US20170361360A1 (en) * 2016-06-20 2017-12-21 Texas Instruments Incorporated Ultrasonic lens cleaning with travelling wave excitation

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007189802A (ja) * 2006-01-12 2007-07-26 Canon Inc 振動波駆動装置及び振動波駆動機器
JP2009265473A (ja) * 2008-04-28 2009-11-12 Konica Minolta Opto Inc レンズ、撮像レンズ及び撮像装置
JP2013080177A (ja) * 2011-10-05 2013-05-02 Aisin Seiki Co Ltd 水滴除去機能付カメラ
JP2015231216A (ja) * 2014-06-06 2015-12-21 株式会社タムロン 光学ユニット及び車載用撮像装置
JP2017170303A (ja) * 2016-03-22 2017-09-28 オリンパス株式会社 液滴排除装置と、液滴排除装置を有する画像装置及び上記液滴排除装置の制御方法と上記液滴排除装置の制御プログラム
US20170361360A1 (en) * 2016-06-20 2017-12-21 Texas Instruments Incorporated Ultrasonic lens cleaning with travelling wave excitation

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113767616A (zh) * 2020-03-27 2021-12-07 株式会社村田制作所 振动装置和振动控制方法
CN113767616B (zh) * 2020-03-27 2023-04-04 株式会社村田制作所 振动装置和振动控制方法
WO2023153017A1 (fr) * 2022-02-10 2023-08-17 株式会社村田製作所 Dispositif de vibration et dispositif d'imagerie

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