VIBRATION DEVICE AND IMAGING DEVICE

Abstract

The present disclosure provides a vibrating device and an image-generating device configured to make it difficult for foreign bodies to adhere to a section that could cause a reduction in vibrational power. A vibrating device (10) comprises: an outermost lens (1) (light transmission element) that transmits light of a predetermined wavelength; a vibrating element (3) that is in contact with the outermost lens (1) and causes the outermost lens (1) to vibrate; a piezoelectric element (5) provided on the vibrating element (3); a leaf spring (2a) and a spacer (2b) (extension segment) that extend outwards from a side wall of the vibrating element (3), which is formed as a tubular body; and a cover (7) that covers the vibrating element (3) and at least part of the leaf spring (2a).

Description

Technical field

[0001] The present invention relates to a vibrating device and an image generating device. Background technology

[0002] Nowadays, a vehicle controls a safety system and performs driver assistance functions by using images obtained from an image-generating device. An image-generating device is therefore located at the front or rear of the vehicle. Such a device is typically located on the exterior of the vehicle, and foreign matter, such as raindrops (water droplets), mud, and dust, adheres to a light transmission component (a protective cover or lens) that covers the image-generating device.

[0003] If foreign particles adhere to the light transmission element, they may appear in an image captured by the imaging device, potentially resulting in an unclear image. The unexamined Japanese patent application with publication number 2017-170303 (Patent Document 1) discloses a droplet removal device (vibrating device) incorporated into an imaging device. This droplet removal device vibrates a light transmission element to remove foreign particles adhering to its surface. Reference list patent document

[0004] Patent document 1: Unexamined Japanese patent application with publication number 2017-170303 Brief description of the invention: Technical problem

[0005] In the vibrating device disclosed in patent document 1, a piezoelectric element is attached to a flange of the light transmission component, and the light transmission component is set into vibration. To secure the piezoelectric element to the flange in this vibrating device, the piezoelectric element is enclosed by a leak-proof seal, which is attached to a base frame. This configuration allows vibrations from the leak-proof seal, which is in direct contact with the piezoelectric element, to be transmitted to the base frame. This reduces the vibration power.

[0006] Additionally, in the oscillating device disclosed in patent document 1, foreign bodies such as water and dust can adhere to the drip-proof seal. These foreign bodies adhering to the drip-proof seal can disrupt the oscillation of the piezoelectric element and reduce its oscillation power.

[0007] Accordingly, one objective of the present disclosure is to provide a vibrating device and an image-generating device configured to make it difficult for foreign bodies to adhere to a section that may cause a reduction in vibration power. Solution to the problem

[0008] A vibrating device according to one aspect of the disclosure comprises the following features: a light transmission element that transmits light of a predetermined wavelength, a vibrating element that is in contact with the light transmission element and sets the light transmission element into vibration, a piezoelectric element provided on the vibrating element, an extension segment that extends outwards from a side wall of the vibrating element, the vibrating element being formed as a tubular body, and a cover that covers the vibrating element and at least part of the extension segment.

[0009] An image-generating device according to one aspect of the disclosure comprises the vibrating device described above and an image-generating device. The image-generating device is arranged such that the light transmission element is positioned in a viewing direction of the image-generating device. Advantageous effects of the invention

[0010] According to the present disclosure, a cover is provided to make it more difficult for foreign bodies to adhere to a vibrating element and at least part of an extension segment, thereby preventing a reduction in vibration power. Brief description of the drawings Fig. Figure 1 is a perspective view of an image generating device according to a first embodiment. Fig. Figure 2 is a half-section view of a oscillating device according to the first embodiment. Fig. Figure 3 shows a diagram and a schematic view to illustrate the relationship between the displacement and the distance from a starting point. Fig. Figure 4 is a schematic view to illustrate the displacement that occurs in the oscillating device of the first embodiment. Fig. Figure 5 shows a diagram and a perspective view to illustrate the relationship between the degree of displacement of an outermost lens (light transmission element) and a load. Fig. Figure 6 is a diagram illustrating the relationship between the degree of displacement of the outermost lens (light transmission element) and the Young's modulus of an intermediate element. Fig. Figure 7 is a half-section view of a oscillating device according to a first modified example. Fig. Figure 8 is a half-section view of a oscillating device according to a second modified example. Fig. Figure 9 is a half-section view of a oscillating device according to a third variation example. Fig. Figure 10 is a half-section view of a oscillating device according to a fourth variation example. Fig. Figure 11 is a half-section view of a oscillating device according to a fifth variation example. Fig. Figure 12 is a half-section view of a oscillating device according to a sixth variation example. Fig. Figure 13 is a sectional view illustrating a holding position of a cover. Fig. Figure 14 is a sectional view illustrating another holding position of the cover. Fig. Figure 15 is a half-section view of a oscillating device according to a second embodiment. Fig. Figure 16 is a schematic view to illustrate the displacement that occurs in the oscillating device of the second embodiment. Fig. Figure 17 is a half-section view of a oscillating device according to a modification example of the second embodiment. Fig. Figure 18 is a half-section view of a oscillating device according to a third embodiment. Fig. Figure 19 shows diagrams to illustrate the relationship between the degree of displacement of the outermost lens (light transmission element) and the dimensions of an intermediate element. Fig. Figure 20 is a half-section view of a oscillating device according to a modification example of the third embodiment. Fig. Figure 21 is a half-section view of a oscillating device according to a fourth embodiment. Fig. Figure 22 shows perspective views of a oscillating device according to a fifth embodiment. Description of exemplary implementations

[0011] An image-generating device of the present disclosure is described in detail below with reference to the drawings. Identical or corresponding elements are identified by the same reference numerals in the drawings. The image-generating device described below is used, for example, in a vehicle and can vibrate a light transmission element (for example, an outermost lens) to remove foreign matter adhering to the surface of the light transmission element. The use of the image-generating device is not limited to a vehicle. For example, the image-generating device can be applied to a security camera, a drone, or another machine. First embodiment

[0012] Fig. Figure 1 is a perspective view of an image generating device 100 according to a first embodiment. Fig. Figure 2 is a half-section view of a vibrating device 10 according to the first embodiment. The X, Y, and Z directions in the drawings represent the lateral, depth, and vertical directions of the image-generating device 100, respectively. The dashed line with long lines in Fig. Figure 2 shows a section of the oscillating device 10 that passes through its central axis. The image-generating device 100 comprises the oscillating device 10 and a sensor device 20. The oscillating device 10 comprises an outermost lens 1, a housing 2, an oscillating element 3, a piezoelectric element 5, and a cover 7. The sensor device 20 comprises a holder 8 that supports an image-generating device 6. The image-generating device 100 preferably comprises an inner lens between the outermost lens 1 and the image-generating device 6, although such an inner lens is not shown.

[0013] After the alignment adjustment between the outermost lens 1 and the image-generating device 6 has been performed, the sensor device 20 is interconnected with the oscillating device 10, thereby forming the image-generating device 100. The image-generating device 6 is an image sensor, such as a charge-coupled device (CCD) or a complementary metal-oxide-semiconductor (CMOS) sensor, and is mounted on a circuit board substrate (not shown). The circuit board substrate can accommodate not only a semiconductor device, such as a general-purpose integrated circuit (IC) or an application-specific integrated circuit (ASIC), that controls the image-generating device 6, but also a semiconductor device that generates a signal to drive, for example, the piezoelectric element 5.The circuit board carrier material is attached to the bracket 8 at a position where the alignment adjustment between the image-generating device 6 and the outermost lens 1 or the inner lens (not shown) was performed. The bracket 8 is made, for example, of aluminum (A5052).

[0014] The outermost lens 1 is a light transmission component that transmits light of a predetermined wavelength (for example, a wavelength of visible light or a wavelength receivable by an image-forming device). Examples of the outermost lens 1 are borosilicate crown glass (BK7), quartz glass, crown glass, flint glass, and a convex-concave lens. The oscillating device 10 can use a transparent component, such as a protective cover, instead of the outermost lens 1. The protective cover is made of glass or a resin, such as transparent plastic.

[0015] An end section of the outermost lens 1 is in contact with an end section of a leaf spring 2a extending from the housing 2. The end section of the leaf spring 2a is a spacer 2b. The spacer 2b is in contact with the outermost lens 1 and the oscillating element 3. An adhesive, for example, is located between the spacer 2b and the outermost lens 1 or the oscillating element 3. The housing 2, the leaf spring 2a, and the spacer 2b can be formed as a single piece or as separate components. In the oscillating device 10, the oscillating element 3 is in contact with the outermost layer 1 to set the outermost lens 1 into vibration. The housing 2 and the oscillating element 3 are, for example, made of stainless steel (SUS304, SUS420, or SUS440).

[0016] As in Fig. As shown in Figure 2, the oscillating element 3 is formed as a tubular body and comprises a connecting segment 31 (first section) that is in contact with the outermost lens 1, an oscillating segment 32 (second section) that accommodates the piezoelectric element 5, and a support segment 33 (third section) that couples the connecting segment 31 and the oscillating segment 32. The cross-sectional shape of the support segment 33 is S-shaped. An inner lens, not shown, may be located inside the tubular body of the oscillating element 3.

[0017] The connecting segment 31 is a cylindrical section extending in the axial direction (Z-direction) of the tubular body. An end section of the connecting segment 31 is in contact with the circumferential section of the outermost lens 1, enabling the connecting segment 31 to transmit the vibration of the oscillating element 3 to the outermost lens 1. A recess is formed in the connecting segment 31 to stabilize the outermost lens 1 in the radial direction (X- and Y-directions) of the tubular body.

[0018] The oscillating segment 32 is a section that vibrates together with the piezoelectric element 5. The oscillating segment 32 is thicker than the connecting segment 31 and the support segment 33. In this way, the vibration of the piezoelectric element 5 can be transmitted more efficiently to the outermost lens 1.

[0019] The support segment 33 is a section that carries the connecting segment 31 and also transmits the vibration of the vibrating segment 32 to the connecting segment 31. The connecting segment 31, the vibrating segment 32, and the support segment 33 can be formed as a single piece or as separate components.

[0020] The piezoelectric element 5 is mounted on the surface of the vibrating segment 32 opposite the surface of the vibrating element 3, which is in contact with the outermost lens 1. The piezoelectric element 5 is formed in a hollow circular shape and is set into vibration, for example, by polarization in the thickness direction. The piezoelectric element 5 is made of PZT piezoceramic. Other types of piezoceramic, such as (K,Na)NbO3, can also be used. Alternatively, a piezoelectric single crystal, such as LiTaO3, can also be used.

[0021] The piezoelectric element 5, with a hollow circular shape, is set into vibration in the radial direction. This vibration is converted by the support segment 33 of the oscillating element 3 into a vibration in the Z-direction (up-down direction in the drawing), thereby setting the outermost lens 1 into vibration in the Z-direction.

[0022] When the outermost lens 1 is set into vibration by the oscillating element 3, the spacer 2b, which is in contact with the outermost lens 1 and the oscillating element 3, and the leaf spring 2a, which is coupled to the spacer 2b, are also set into vibration. The leaf spring 2a and the spacer 2b form an extension segment that extends outwards from the side wall of the oscillating element 3. The displacement of the extension segment, which is generated by the vibration of the oscillating element 3, decreases towards the outside. The displacement of the leaf spring 2a and the spacer 2b is explained in more detail below, assuming that the position at which the oscillating element 3 and the spacer 2b are in contact with each other is a starting point. Fig. Figure 3 shows a diagram and a schematic view to illustrate the relationship between the displacement and the distance from the starting point.

[0023] As in Fig. As illustrated in Figure 3(b), the image-generating device 100 is mounted on a machine (for example, a vehicle) such that the optical axis (indicated by the long dashed line) is positioned at approximately 90 degrees with respect to the direction of gravity (downward direction in the drawing). Because of this arrangement, foreign bodies with a high moisture content, such as raindrops, adhering to the outer lens 1 and the leaf spring 2a (extension segment), move downward in the drawing due to gravity G. However, if the outermost lens 1 and the leaf spring 2a are displaced due to the vibration of the oscillating element 3, the foreign bodies W adhering to the leaf spring 2a, which is set into vibration with a degree of displacement that does not cause the foreign bodies W to atomize, move in a direction of greater displacement. This can be explained as follows.The force that deforms the foreign bodies W due to the oscillation of the oscillating element 3 varies depending on the degree of displacement. This shifts the center of gravity of the foreign bodies W, thereby generating the force P, which moves the foreign bodies W in the direction of a greater degree of displacement.

[0024] As in Fig. As shown in Figure 3(a), the degree of displacement of the leaf spring 2a and the spacer 2b decreases as the distance from the starting point increases. Accordingly, the force P, generated in the foreign bodies W due to the vibration in the oscillating element 3, acts towards the starting point, i.e., in the opposite direction to the force of gravity G. The foreign bodies W adhering to the leaf spring 2a therefore remain in a position where the force P and gravity G are balanced. If the foreign bodies W continue to remain attached to the leaf spring 2a, the vibration of the piezoelectric element 5 can be affected by these foreign bodies W, thereby reducing the vibrational power.

[0025] To solve this problem, the vibrating device 10 includes the cover 7, which covers the leaf spring 2a to prevent foreign matter from adhering to it. The cover 7 is designed to have a gap to prevent direct contact with the leaf spring 2a, which is set into vibration by the vibrating element 3, and is held against the outer surface (surface perpendicular to the leaf spring 2a) of the housing 2. The displacement of the cover 7 does not occur due to the vibration of the vibrating element 3, so foreign matter no longer remains on the surface of the cover 7. Consequently, the vibration of the piezoelectric element 5 is not affected by foreign matter adhering to the cover 7, and the vibration power is not reduced.It is sufficient that the cover 7 can cover the oscillating element 3 and at least part of the leaf spring 2a (extension segment) which is displaced by the oscillation of the oscillating element 3.

[0026] Fig. Figure 4 is a schematic view to illustrate the displacement that occurs in the oscillating device 10 of the first embodiment. As shown in Figure 4, the displacement is a schematic representation illustrating the displacement that occurs in the oscillating device 10 of the first embodiment. Fig. As can be seen in Figure 4, the support segment 33 is elastically deformed like a spring, so that the oscillating element 3 displaces the outermost lens 1 by a considerable amount in the Z-direction. Due to the oscillation of the oscillating element 3, the leaf spring 2a, which is in contact with the outermost lens 1, is also elastically deformed. As can also be seen from Figure 4, the support segment 33 is elastically deformed like a spring, so that the oscillating element 3 displaces the outermost lens 1 by a considerable amount in the Z-direction. Fig. As can be seen in Figure 4, the oscillating element 3 has an oscillating node N in the middle of a section of the support segment 33, the cross-sectional shape of which is S-shaped. Due to the oscillation of the oscillating element 3, the displacement of the outermost lens 1 is greatest, while the displacement of the middle (node) of the support segment 33 is small. Fig. Figure 4 shows that the magnitude of the displacement is represented by the hatching density. An area with denser hatching represents a section with a greater displacement. The greatest displacement occurs at the outermost lens 1, while the smallest displacement is observed at the center of the support segment 33 and the housing 2.

[0027] The cover 7 is held in place by the housing 2, which exhibits the smallest displacement. The condition for a section capable of holding the cover 7 is explained in more detail below. It is necessary that the cover 7 be located in a position where the vibration of the outermost lens 1 is not affected by the action of an external force. To determine the position of the cover 7 where the vibration of the outermost lens 1 is not affected, the degree of displacement of the outermost lens 1 was investigated by applying a load to the four corners of the housing 2 of the vibration device 10. Fig. Figure 5 shows a diagram and a perspective view to illustrate the relationship between the degree of displacement of the outermost lens 1 (light transmission element) and the load.

[0028] Fig. Figure 5(a) illustrates a change in the degree of displacement of the outermost lens 1 when a weight of 0 to 800 g was placed at the four corners of the housing 2. Fig. 5(a) The horizontal axis shows the mass (g) of the weight, and the vertical axis shows the rate of change of the displacement when the displacement of the outermost lens 1 with a weight of 0 g is 100%. When weights were placed at the four corners of the housing 2, the displacement of the outermost lens 1 was almost unchanged, regardless of the mass of the weight.

[0029] Fig. Figure 5(b) illustrates the degree of displacement of the vibration device 10, which was determined using a simulation. Fig. In Figure 5(b), the magnitude of the displacement is represented by the hatching density. An area with denser hatching represents a section with a greater displacement. The displacement of the outermost lens 1 is greatest, at approximately 40 µm. The displacement of the housing 2 is smallest, at approximately 0.8 µm. The displacement of the four corners of the housing 2, which contains the weight, is approximately 0.8 µm, which is about 2% of the greatest displacement of the outermost lens 1. Therefore, a section with a displacement of 0.8 µm or less, as shown in Figure 5(b), can be considered a displacement of approximately 0.8 µm or less. Fig. 5(b) is indicated by sparse hatching and satisfies the condition for a section that can hold the cover 7. This means that the cover 7 can be held by a section whose displacement is less than or equal to a predetermined value (for example, 2% with respect to the largest displacement).

[0030] A gap is provided between the cover 7 and the leaf spring 2a or the spacer 2b, the degree of displacement of which, generated by the vibration of the oscillating element 3, is greater than a predetermined value (for example, 2% with respect to the maximum displacement). The oscillating device 10 includes intermediate elements 71 and 72 to prevent the ingress of foreign bodies into this gap. Intermediate element 71 fills the gap between the cover 7 and the spacer 2b, while intermediate element 72 fills the gap between the cover 7 and the leaf spring 2a. Intermediate elements 71 and 72 are therefore in direct contact with the spacer 2b and the leaf spring 2a, respectively.

[0031] Since the intermediate elements 71 and 72 are in direct contact with the spacer 2b and the leaf spring 2a, a material with a low Young's modulus, such as rubber, resin, or foam, which does not interfere with the vibration of the piezoelectric element 5 and does not reduce the vibration power, is used for the intermediate elements 71 and 72. In addition to not reducing the vibration power, the intermediate elements 71 and 72 preferably have additional functions, such as water impermeability and sealing (being able to enclose a space). Fig. Figure 6 is a diagram illustrating the relationship between the degree of displacement of the outermost lens 1 (light transmission element) and the Young's modulus of the intermediate elements 71 and 72. Fig. Figure 6 shows the Young's modulus (GPa) on the horizontal axis and the rate of change of the displacement on the vertical axis when the displacement of the outermost lens 1 without the intermediate elements 71 and 72 is 0%. If the Young's modulus of the intermediate elements 71 and 72 is 1.0 GPa or less, the displacement of the outermost lens 1 remains constant, as shown in Figure 6. Fig. As can be seen in Figure 6, the value is 0%, even when the intermediate elements 71 and 72 fill the space between the cover 7 and the spacer 2b and the space between the cover 7 and the leaf spring 2a. Therefore, if a material with a Young's modulus of 1.0 GPa or less is used for the intermediate elements 71 and 72, the intermediate elements 71 and 72 in the vibration device 10 do not interfere with the vibration of the piezoelectric element 5, nor do they reduce the vibration power. First variation example

[0032] As in Fig. As illustrated in Figure 2, the intermediate components 71 and 72 in the oscillating device 10 fill the space between the cover 7 and the spacer 2b and the space between the cover 7 and the leaf spring 2a. However, an oscillating device can comprise only the cover 7, merely to make it more difficult for foreign objects to adhere to the leaf spring 2a. Fig. Figure 7 is a half-section view of a vibrating device 10a according to a first modified example. One element of the vibrating device 10a, which has the same configuration as the vibrating device 10 in Fig. If the reference number is 2, it is indicated by the same reference numerals and an explanation of it is omitted.

[0033] The oscillating device 10a comprises a cover 7 arranged such that it has a gap to prevent direct contact with the leaf spring 2a and is held against the outer surface of the housing 2. The oscillating device 10a is not provided with an intermediate element between the cover 7 and the leaf spring 2a or the spacer 2b. The cover 7 is arranged to cover the leaf spring 2a and can therefore at least make it more difficult for foreign bodies to adhere to the leaf spring 2a. Second variation example

[0034] The oscillating device 2a has a gap between the cover 7 and the spacer 2b, as shown in Fig. 7 shown. Alternatively, the space between the cover 7 and the spacer 2b can be filled. Fig. Figure 8 is a half-section view of a vibrating device 10b according to a second modified example. One element of the vibrating device 10b, which has the same configuration as the vibrating device 10 in Fig. If the reference number is 2, it is indicated by the same reference numerals and an explanation of it is omitted.

[0035] The vibrating device 10b comprises a cover 7 arranged such that it has a gap to prevent direct contact with the leaf spring 2a and is held against the outer surface of the housing 2. The vibrating device 10b is also provided with an intermediate element 71 that fills a gap between the cover 7 and the spacer 2b. Because of the intermediate element 71, the vibrating device 10b can prevent the ingress of foreign bodies into the gap between the cover 7 and the leaf spring 2a. A material with a Young's modulus of 1.0 GPa or less is preferably used for the intermediate element 71. The intermediate element 71 is in contact with the leaf spring 2a at a surface as shown in Fig. 8 shown, however this configuration is not essential. Third variation example

[0036] The cover 7 of the vibrating device 10 is held on a side surface of the housing 2, as shown in Fig. 2 shown. When the cover 7 is held against a section of the housing 2 whose displacement is less than or equal to a predetermined value (for example, 2% with respect to the largest displacement), it nevertheless does not disturb the vibration of the piezoelectric element 5 nor does it reduce the vibration power. Fig. Figure 9 is a half-section view of a vibrating device 10c according to a third modified example. One element of the vibrating device 10c, which has the same configuration as the vibrating device 10 in Fig. If the reference number is 2, it is indicated by the same reference numerals and an explanation of it is omitted.

[0037] The oscillating device 10c comprises a cover 7a arranged such that it has a gap to prevent direct contact with the leaf spring 2a, and which is held against the upper surface (parallel surface to the leaf spring 2a) of the housing 2. As shown in Fig. As shown in Figure 4, the displacement of the section of the housing 2 that holds the cover 7a is less than or equal to the predetermined value. The cover 7a covers a section of the leaf spring 2a whose displacement is greater than or equal to the predetermined value, thus making it difficult for foreign objects to adhere to this section. The intermediate element 71 can be provided in the space between the cover 7a and the spacer 2b. Fourth variation example

[0038] As in Fig. As illustrated in Figure 2, the intermediate elements 71 and 72 in the oscillating device 10 fill the gap between the cover 7 and the spacer 2b and the gap between the cover 7 and the leaf spring 2a. However, providing a gap between the cover 7 and the leaf spring 2a or the spacer 2b can be omitted. Fig. Figure 10 is a half-section view of a vibrating device 10d according to a fourth variation example. One element of the vibrating device 10d, which has the same configuration as the vibrating device 10 in Fig. If the reference number is 2, it is indicated by the same reference numerals and an explanation of it is omitted.

[0039] The vibration device 10d comprises a cover 7b that is in direct contact with the leaf spring 2a. The cover 7b is in direct contact with a section of the leaf spring 2a whose displacement is greater than the predetermined value. Therefore, a material with a Young's modulus of 1.0 GPa or less is used for the cover 7b. Thus, the vibration device 10d, using the cover 7b, can prevent foreign matter from adhering to the leaf spring 2a, does not interfere with the vibration of the piezoelectric element 5, and does not reduce the vibration power. Fifth variation example

[0040] The cover 7 of the oscillating device 10a is located essentially parallel to the leaf spring 2a, as shown in Fig. 7 shown. However, a cover 7 can be inclined with respect to the leaf spring 2a. Fig. Figure 11 is a half-section view of a vibrating device 10e according to a fifth modification example. One element of the vibrating device 10e, which has the same configuration as the vibrating device 10 in Fig. If the reference number is 2, it is indicated by the same reference numerals and an explanation of it is omitted.

[0041] The oscillating device 10e comprises a cover 7c arranged such that it has a gap to prevent direct contact with the leaf spring 2a and is held against the outer surface of the housing 2. The cover 7c is inclined from the outermost lens 1 towards the section held against the housing 2, and the position of the held section of the cover 7c is lower than the position of the outermost lens 1 in the axial direction (Z-direction) of the tubular body. Inclining the cover 7c in this way allows foreign particles W to flow along the inner surface (the surface facing the leaf spring 2a) of the cover 7c and to flow out of an outlet opening 73, as shown in Fig. 11 illustrated.

[0042] As in Fig. As shown in Figure 11, the vibrating device 10e is preferably mounted on a machine (for example, a vehicle) such that the axial direction (Z-direction) of the tubular body is positioned at approximately 90 degrees with respect to the direction of gravity G (downward direction in the drawing). Only a section of the cover 7c, which is positioned at the bottom when the vibrating device 10e is mounted on a machine, may be inclined. When the vibrating device 10e is configured to have the inclined cover 7c, the connecting segment 31 of the vibrating element 3 is preferably extended in the axial direction of the tubular body (Z-direction), as shown in Figure 11. Fig. 11 shown. A water-repellent or hydrophilic coating material can be applied to the surface of the cover 7c, which faces the leaf spring 2a. Sixth variation example

[0043] In the oscillating device 10e, the cover 7c is inclined with respect to the leaf spring 2a to facilitate the discharge of foreign matter, as shown in Fig. Figure 11 shows that, to facilitate the removal of foreign objects, a guide section can alternatively be provided for a cover, which removes foreign objects. Fig. Figure 12 is a half-section view of a vibrating device 10f according to a sixth variation example. One element of the vibrating device 10f, which has the same configuration as the vibrating device 10 in Fig. If the reference number is 2, it is indicated by the same reference numerals and an explanation of it is omitted.

[0044] The vibrating device 10f comprises a cover 7d arranged such that it has a gap to prevent direct contact with the leaf spring 2a and is held against the outer surface of the housing 2. Irregularities are formed on the surface of the cover 7d facing the leaf spring 2a, and a guide section 74 is provided to discharge foreign matter. The provision of the guide section 74 for the cover 7d allows foreign matter W to flow along the guide section 74 and out of an outlet opening 73 provided for the cover 7d, as shown in Fig. 12 is illustrated.

[0045] As in Fig. As shown in Figure 12, the oscillating device 10f is preferably mounted on a machine (for example, a vehicle) such that the axial direction (Z-direction) of the tubular body is positioned at approximately 90 degrees with respect to the direction of gravity G (downward direction in the drawing). The guide section 74 can only be provided for a section of the cover 7d that is positioned on the lower side when the oscillating device 10f is mounted on a machine. The cover 7d can be inclined, as shown with respect to the cover 7c in Figure 12. Fig. 11 shown. A water-repellent or hydrophilic coating material can be applied to the surface of the cover 7d, which faces the leaf spring 2a. Seventh variation example

[0046] As in Fig. As illustrated in Figure 7, the cover 7 of the vibrating device 10a is arranged such that it has a gap to prevent direct contact with the leaf spring 2a and is held against the outer surface of the housing 2. However, the cover 7 can be held against an element other than the housing 2. Fig. Figure 13 is a sectional view illustrating a holding position of the cover 7.

[0047] As in Fig. As illustrated in Figure 13, the cover 7 is arranged such that it has a gap to prevent direct contact with the leaf spring 2a and is held against a vehicle body 90. The vehicle body 90 is part of a machine in or on which the oscillating device 10a is installed. By being located against the vehicle body 90, the cover 7 can be held against a section to which the vibration of the oscillating device 10a is not transmitted. The cover 7 is held between the housing 2 and the vehicle body 90.

[0048] The cover 7 can also be held only on the vehicle body 90 instead of between the housing 2 and the vehicle body. Fig. Figure 14 is a sectional view illustrating another holding position of the cover 7. As in Fig. As illustrated in Figure 14, a cover 7e is provided which has a gap to prevent direct contact with the leaf spring 2a and is held against a vehicle body 90. The housing 2 and the vehicle body 90 are directly connected to each other. The cover 7e is only held against the vehicle body 90. Second embodiment

[0049] In the oscillating device 10 of the first embodiment, the leaf spring 2a and the spacer 2b form an extension segment that extends outwards from the side wall of the oscillating element 3, as shown in Fig. Figure 2 illustrates this. In a oscillating device of a second embodiment, a section extending directly from an oscillating element is an extension segment. Fig. Figure 15 is a half-section view of a vibrating device 10a according to the second embodiment. One element of the vibrating device 10A, which has the same configuration as the vibrating device 10 in Fig. 2, is indicated by the same reference numerals and an explanation thereof is omitted. Instead of the oscillating device 10, which in Fig. As shown in Figure 1, the vibrating device 10A can be combined with the sensor device 20 to form the image generating device 100.

[0050] As in Fig. As shown in Figure 15, the oscillating element 3 is a tubular body and comprises a connecting segment 31 (first section) which is in contact with the outermost lens 1, an oscillating segment 32 (second section) which accommodates the piezoelectric element 5, and a support segment 33 (third section) which couples the connecting segment 31 and the oscillating segment 32.

[0051] The connecting segment 31 is a cylindrical section that is in contact with the lower surface of the outermost lens 1 and transmits the vibration of the oscillating element 3 to the outermost lens 1. The connecting segment 31 includes a retaining section 31a to hold the outermost lens 1 stably in the radial direction (X and Y directions) of the tubular body. The connecting segment 31 and the retaining section 31a can be formed in one piece or formed separately and then combined together.

[0052] The vibrating segment 32 is a section that vibrates together with the piezoelectric element 5. The vibrating segment 32 is thicker than the connecting segment 31 and the support segment 33. On its side surface, the vibrating segment 32 includes a flange 32a (extension segment) that extends outwards. The flange 32a is supported by a support segment 2c of the housing 2. The flange 32a and the support segment 2c are bonded together, for example, by an adhesive.

[0053] The piezoelectric element 5, with a hollow circular shape, is set into vibration in the radial direction. This vibration is converted by the support segment 33 of the oscillating element 3 into a vibration in the Z-direction (up-down direction in the drawing), thereby setting the outermost lens 1 into vibration in the Z-direction.

[0054] Fig. Figure 16 is a schematic view to illustrate the displacement that occurs in the oscillating device 10A of the second embodiment. As shown in Figure 16, the displacement occurs in the oscillating device 10A of the second embodiment. Fig. As can be seen in Figure 16, the support segment 33 is elastically deformed like a spring, so that the oscillating element 3 displaces the outermost lens 1 by a considerable amount in the Z-direction. As also shown in Figure 16, the support segment 33 is elastically deformed like a spring, causing the oscillating element 3 to displace the outermost lens 1 by a considerable amount in the Z-direction. Fig. As can be seen in Figure 16, the connecting segment 31, the holding section 31a, the oscillating segment 32 and the support segment 33 of the oscillating element 3 are also displaced to a considerable extent. Fig. Figure 16 shows that the magnitude of the displacement is represented by the hatching density. An area with denser hatching represents a section with a greater displacement. The greatest displacement occurs at the outermost lens 1, while the smallest displacement is observed at the housing 2.

[0055] As in Fig. As shown in Figure 15, the vibrating device 10A includes a cover 7f that covers the vibrating element 3 to prevent foreign matter from adhering to it. The cover 7f is arranged to have a gap to prevent direct contact with the vibrating element 3 and is held against the outer surface (surface perpendicular to the flange 32a) of the housing 2. The displacement of the cover 7f does not occur due to the vibration of the vibrating element 3, so foreign matter does not remain on the surface of the cover 7f. Consequently, the vibration of the piezoelectric element 5 is not affected by the foreign matter adhering to the cover 7f, and the vibration power is not reduced.It is sufficient that the cover 7f can cover the vibrating element 3, including at least part of the flange 32a, whose displacement is greater than a predetermined value (for example, 2% with respect to the greatest displacement).

[0056] A gap is provided between the cover 7f and the retaining section 31a, the degree of displacement of which, generated by the vibration of the vibrating element 3, is greater than the predetermined value. The vibrating device 10A includes an intermediate element 71a to prevent the ingress of foreign bodies into this gap. The intermediate element 71a fills the gap between the cover 7f and the retaining section 31a. Accordingly, the intermediate element 71a is in direct contact with the retaining section 31a. Therefore, a material with a low Young's modulus (1 GPa or less, for example), such as rubber, resin, or foam, is used for the intermediate element 71a so that the intermediate element 71a does not interfere with the vibration of the piezoelectric element 5 and does not reduce the vibrational power.In addition to the ability to not reduce the vibration power, the intermediate element 71a preferably has additional functions, such as functions relating to water impermeability and sealing (being able to enclose a space). Variation example

[0057] An intermediate component can be provided between the cover 7f and the vibration element 3. Fig. Figure 17 is a half-section view of a vibrating device 10B according to a modification of the second embodiment. One element of the vibrating device 10B, which has the same configuration as the vibrating device 10A in Fig. If the reference number is 15, it is indicated by the same reference numerals and an explanation of it is omitted.

[0058] In the vibrating device 10B, the cover 7f is provided to cover the vibrating element 3 and thus prevent foreign bodies from adhering to it, as shown in Fig. Figure 17 illustrates this. The cover 7f is arranged to have a gap to prevent direct contact with the vibrating element 3 and is held against the outer surface of the housing 2. The vibrating device 10B comprises intermediate elements 71a and 72a to prevent the ingress of foreign bodies into the gaps. The intermediate element 71a fills the gap between the cover 7f and the retaining section 31a, while the intermediate element 72a fills the gap between the cover 7f and the vibrating element 3. The intermediate elements 21a and 72a are therefore in direct contact with the vibrating element 3. Therefore, a material with a low Young's modulus (1 GPa or less, for example), such as rubber, resin, and foam, is used for the intermediate elements 71a and 72a so that the intermediate elements 71a and 72a do not disturb the vibration of the piezoelectric element 5 and do not reduce the vibration power.In addition to the ability to not reduce the vibration power, the intermediate components 71a and 72a preferably have additional functions, such as functions relating to water impermeability and sealing (being able to enclose a space). Third example

[0059] In the vibrating device 10 according to the first embodiment, the intermediate elements 71 and 72 fill the gap between the cover 7 and the spacer 2b and the gap between the cover 7 and the leaf spring 2a to prevent the ingress of foreign bodies into these gaps. The intermediate element 71 fills the gap between the spacer 2b (side surface of the extension segment) and the cover 7, while the intermediate element 72 fills the gap between the leaf spring 2a (extension segment) and the cover 7. Preferably, a material with a Young's modulus of 1.0 GPa or less is used for the intermediate elements 71 and 72 so that the intermediate elements 71 and 72 do not interfere with the vibration of the piezoelectric element 5 and do not reduce the vibration power of the vibrating element 3.Besides the Young module, the vibration power of the vibrating element 3 can also be influenced by the shape of the intermediate element that is in contact with the cover 7. Therefore, in a third embodiment, the shape of the intermediate element that is in contact with the cover 7 is investigated.

[0060] Fig. Figure 18 is a half-section view of a vibrating device 10 according to the third embodiment. The configuration of the vibrating device 10, which is shown in Fig. The one shown in 18 is the same as that of the oscillating device 10, which is shown in Fig. 2 is shown. An element of the oscillating device 10 in Fig. 18, which is connected to the oscillating device 10 in Fig. 2, which is identical, is indicated by the same reference numerals and an explanation thereof is omitted. Due to the structure of the intermediate element 71, the effect of the intermediate element 71, which is sandwiched between the spacer 2b and the cover 7, on the vibration power of the vibrating element 3 can be greater than that of the intermediate element 72, as shown in Fig. Figure 18 shows the relationship between the degree of displacement of the outermost lens 1 and the shape of the intermediate element 71. Fig. Figure 19 shows diagrams to illustrate the relationship between the degree of displacement of the outermost lens 1 and the dimensions of the intermediate element 71.

[0061] For example, it is assumed that the intermediate element 71 has a thickness t (dimension in the X direction), a width w (dimension in the Z direction) and a contact area S with the cover 7, as shown in Fig. Figure 18 illustrates this. The thickness t corresponds to the length (dimension in the X-direction) of the leaf spring 2a (extension segment) in the extension direction. The contact area S can be determined by multiplying the inner circumference of the cover 7 by the thickness k of the cover 7. Fig. Figure 19(a) shows the rate of change of the displacement of the outermost lens 1 when the thickness t of the intermediate element 71 is varied. In the diagram of Fig. Figure 19(a) shows the horizontal axis as the thickness t (mm) of the intermediate element 71 and the vertical axis as the rate of change of the displacement of the outermost lens 1 when the displacement of the outermost lens 1 of the oscillating device 10 without the cover 7 is 0%. In the diagram of Fig. 19(a) specifies the width w of the intermediate element 71 as a prerequisite of 2 mm. As in Fig. As shown in Figure 19(a), the thickness t of the intermediate member 71 is preferably 0.4 mm or less in order to limit the rate of change of displacement to 10% or less.

[0062] Fig. Figure 19(b) shows the rate of change of the displacement of the outermost lens 1 when the width w of the intermediate element 71 is varied. In the diagram of Fig. Figure 19(b) shows the horizontal axis as the width w (mm) of the intermediate element 71 and the vertical axis as the rate of change of the displacement of the outermost lens 1 when the displacement of the outermost lens 1 of the oscillating device 10 without the cover 7 is 0%. In the diagram of Fig. 19(b) specifies the thickness t of the intermediate element 71 as a prerequisite at 0.4 mm. As in Fig. As shown in Figure 19(b), the rate of change of the displacement hardly changes, even when the width w of the intermediate element 71 is varied to 1 mm and to 2 mm. As has been found, this means that the width w of the intermediate element 71 does not affect the vibration power of the vibrating element 3.

[0063] Fig. Figure 19(c) shows the rate of change of the displacement of the outermost lens 1 when the contact area S of the intermediate element 71 with the cover 7 is varied. In the diagram of Fig. 19(c) shows the horizontal axis as the contact area S (mm²). 2 ) with cover 7 and the vertical axis shows the rate of change of the displacement of the outermost lens 1 when the displacement of the outermost lens 1 of the oscillating device 10 with cover 7 is 0%. In the diagram of Fig. In 19(c), the thickness t of the intermediate member 71 is specified as 0.4 mm and the width w of the intermediate member 71 is specified as 2 mm. As in Fig. As shown in Figure 19(c), the contact area S of the intermediate element 71 with the cover 7 is preferably 60 mm². 2 or less, to limit the rate of change of displacement to 10% or less. For example, for the intermediate members 71 and 72, a foam material consisting mainly of polypropylene (PP) is used, and the Young's modulus of this material can be 1.0 GPa or less, or it can be more than 1.0 GPa.

[0064] If the thickness t of the intermediate element 71 is set to 0.4 mm or less and the contact area S of the intermediate element 71 with the cover 7 is 60 mm 2The intermediate element 71 does not affect the vibration power of the vibrating element 3, regardless of whether its setting is higher or lower. This means that the width w (dimension in the Z direction) of the intermediate element 71 can be increased. It is therefore possible to form a cylindrical vibrating device with the outermost lens 1 protruding in the Z direction. Fig. Figure 20 is a half-section view of a vibrating device 10C according to a modification of the third embodiment. An element of the vibrating device 10C, which corresponds to that of the vibrating device 10 in Fig. If 2 is identical, it is indicated by the same reference numerals and an explanation of the same is omitted.

[0065] The oscillating device 10C is formed in a cylindrical shape and the outermost lens 1 protrudes further in the Z direction than that of the oscillating device 10 in Fig. 2. More specifically, the leaf spring 2a, which extends in the X direction, is folded in the oscillating device 10C near the oscillating element 3, and the connecting segment 31 of the oscillating element 3 and the spacer 2b are connected to each other.

[0066] Because of this configuration, the vibrating device 10C is formed in a cylindrical shape, with the outermost lens 1 projecting in the Z-direction. The cover 7 faces the spacer 2b, with the intermediate element 71 positioned between them. As discussed above, the thickness t of the intermediate element 71 is set to 0.4 mm or less, and the contact area S of the intermediate element 71 with the cover 7 is 60 mm². 2 or less. If the dimension in the Z-direction of the intermediate element 71, which is in contact with the cover 7, is 1.0 mm and the inner circumference of the cover 7 is 55 mm, the contact area is set to 55 mm. 2calculated (1.0 × 55 = 55). Since there is no restriction on the width w (dimension in the Z direction) of the intermediate element 71, the intermediate element 7 can be extended along the spacer 2b. Fourth embodiment

[0067] In the oscillating device 10a according to the seventh modification example of the first embodiment, the cover 7 is provided on the vehicle body 90 and connected to the housing 2. In an oscillating device according to a fourth embodiment, the cover can be formed by a part of the vehicle body. Fig. 21 is a half-section view of a vibrating device 10D according to the fourth embodiment. An element of the vibrating device 10D, which corresponds to that of the vibrating device 10 in Fig. If 2 is identical, it is indicated by the same reference numerals and an explanation of the same is omitted.

[0068] In the oscillating device 10D, as in Fig. As shown in Figure 21, a section of the housing 2, to which the vibration of the oscillating device 10D is not transmitted, is connected to a vehicle body 91, and a part of the vehicle body 91 faces the leaf spring 2a, with the intermediate member 72 positioned between them, and the spacer 2b, with the intermediate member 71 positioned between them. This means that a part of the vehicle body 91 serves as the cover 7, which is in Fig. Figure 2 shows that the vibration device 10D can be configured without a cover. The vibration frequency of the vehicle body 91 is approximately 1 to 100 Hz when the vehicle is running. Even if the vibration of the vehicle body 91 is transmitted to the vibration device 10D via a part of the vehicle body 91 that serves as the cover, the vibration frequency differs considerably from the resonant frequency of the vibration device 10D. Therefore, the vibration of the vehicle body 91 does not affect the vibration power. Fifth embodiment

[0069] In the vibrating device 10 according to the first embodiment, the cover 7 is provided to cover the leaf spring 2a. In a fifth embodiment, a method for attaching the cover to the housing is explained in detail. Fig. Figure 22 shows perspective views of a vibrating device 10F according to the fifth embodiment. An element of the vibrating device 10E, which corresponds to that of the vibrating device 10 in Fig. If 1 is identical, it is indicated by the same reference numerals and an explanation of the same is omitted.

[0070] In the vibrating device 10E, a cover 701 is mounted on the housing 2, as shown in Fig. Figure 22(a) shows that retaining claws 701a are provided at two opposite corners of the cover 701. Stop devices 201 for the housing 2 are provided at the positions corresponding to the retaining claws 701a. The retaining claws 701a and the stop devices 201 fit together, thereby securing the cover 701 to the housing 2. In the swing device 10E, the number and positions of the retaining claws 701a to be provided for the cover 701 are not to be limited to those shown in Figure 22(a). Fig. 22(a) are shown, limited. The number and positions of the stop devices 201 to be provided for the housing 2 are determined by those of the retaining claws 701a to be provided for the cover 701.

[0071] Fig. Figure 22(b) shows a cover 702 provided for press-fit projections 702a instead of retaining claws. The projections 702a are provided at the four opposite corners of the cover 702. Receiving sections for the housing 2 are provided at the positions corresponding to the projections 702a, but these are not shown. The number and positions of the projections 702a to be provided for the cover 702 are not to be confused with those in Figure 22(b). Fig. 22(b) limited. The number and positions of the receiving sections to be provided for the housing 2 are determined by those of the projections 702a provided for the cover 702.

[0072] To mechanically attach the cover to the housing (to the vibrating device), a set of retaining claws 701a and stop devices 201 or press-fit projections 702a can be used as described above, and screws can also be used. Alternatively, an adhesive can be used to attach the cover to the housing. Further examples of variations

[0073] The configurations of the vibration devices according to the exemplary embodiments and modifications described above can be combined with one another in a suitable manner. For example, the cover 7f of the second exemplary embodiment can be attached to the vehicle body 90, as shown in Fig. 13 shown, recorded.

[0074] In the vibration devices of the embodiments described above, the cross-sectional shape of the support segment 33 is an S-shape. However, the cross-sectional shape of the support segment 33 is not limited to an S-shape, provided that the support segment 33 is formed in a shape that does not cause stress concentration on the vibration element. For example, the cross-sectional shape of the support segment 33 can be a shape formed by joining several S-shapes or a curved shape that is half an S-shape.

[0075] The image generation device according to the embodiments described above may include a further element, such as a camera, LiDAR, and radar. Several image generation devices may be arranged side by side.

[0076] The image generation device according to the embodiments described above is not limited to being mounted on a vehicle. The image generation device can be applied to any image generation device comprising an optical instrument and an image generation unit arranged such that a light transmission element is positioned in the line of sight of the image generation unit, and which requires the removal of foreign matter adhering to the light transmission element. Aspects (1) A vibrating device according to the present disclosure, which has the following features: a light transmission component that transmits light of a predetermined wavelength; a vibrating element that is in contact with the light transmission component and sets the light transmission component into vibration; a piezoelectric element provided on the oscillating element; an extension segment extending outwards from a side wall of the oscillating element, the oscillating element being formed like a tubular body; and a cover covering the oscillating element and at least part of the extension segment. In the vibrating device according to the disclosure, which is configured as described above, a cover is provided which makes it difficult for foreign bodies to adhere to a vibrating element and at least to a part of an extension segment, thereby reducing the vibration power. (2) The oscillating device according to (1), wherein a space is provided between the cover and a section of the oscillating element and a section of the extension segment, the degree of displacement of the section of the oscillating element and the section of the extension segment resulting from oscillation of the oscillating element is greater than a predetermined value, and the cover is held at a section whose degree of displacement resulting from oscillation of the oscillating element is less than or equal to the predetermined value. (3) The oscillating device according to (2), which further comprises the following feature: an intermediate element provided in a space between the cover and the vibration element or between the cover and the extension segment, wherein a Young modulus of the intermediate element is 1 GPa or less. (4) The oscillating device according to (2), which further comprises the following feature: an intermediate element provided in a space between the cover and the vibrating element or between the cover and the extension segment, wherein a dimension of the intermediate element in an extension direction of the projecting segment is 0.4 mm or less. (5) The oscillating device according to (2), which further comprises the following feature: an intermediate component provided in a space between the cover and the vibration element or between the cover and the extension segment, wherein a contact area of ​​the intermediate component with the cover is 60 mm 2 or less. (6) The oscillating device according to (2), wherein the cover is inclined in a direction from the light transmission element towards a fixed section of the cover; and a position of the fixed section of the cover is lower than a position of the light transmission element in an axial direction of the tubular body. (7) The vibrating device according to (2) or (6), wherein irregularities are formed on a surface of the cover facing the vibrating element or the extension segment, and a guide section that releases foreign matter is provided for the cover. (8) The oscillating device according to (6) or (7), wherein a water-repellent or hydrophilic coating material is applied to a surface of the cover facing the oscillating element or the extension segment. (9) The vibrating device according to any of (1) to (8), wherein the cover is held on a part of a machine in or on which the vibrating device is installed. (10) The vibrating device according to any of (1) to (8), wherein the cover is part of a machine in or on which the vibrating device is installed. (11) The oscillating device according to any of (1) to (10), wherein the cover is attached to the oscillating device mechanically or by means of an adhesive. (12) The vibration device according to (1), wherein the cover is in contact with at least a section of the vibration element and a section of the extension segment, a degree of displacement of the section of the vibration element and the section of the extension segment resulting from a vibration of the vibration element is greater than a predetermined value and the cover is made of a material having a Young modulus of 1 GPa or less. (13) An image-generating device having the following features: the oscillating device according to one of (1) to (12); and an image generating device arranged such that the light transmission element is positioned in a viewing direction of the image generating device.

[0077] The disclosed embodiments serve only for illustrative purposes and are not intended to be exhaustive or to limit the disclosure to the specific forms disclosed. It is intended that the scope of protection of the disclosure is defined not by the foregoing embodiments, but by the claims that follow. The scope of protection of the disclosure is to be interpreted as broadly as possible to include all such modifications and equivalent structures and functions. Reference symbol list

[0078] 1 outermost lens, 2 housing, 2a leaf spring, 2b spacer, 3 oscillating element, 5 piezoelectric element, 6 image generating device, 8 mount, 10 oscillating device, 20 sensor device, 31 connecting segment, 32 oscillating segment, 33 support segment, 71, 71a, 72, 72a intermediate component, 73 outlet opening, 74 guide section, 90 vehicle body, 100 image generating device QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] JP 2017-170303 [0003, 0004]

Claims

[1] A vibrating device which has the following features: a light transmission component that transmits light of a predetermined wavelength; a vibrating element that is in contact with the light transmission component and sets the light transmission component into vibration; a piezoelectric element provided on the oscillating element; an extension segment extending outwards from a side wall of the oscillating element, the oscillating element being formed like a tubular body; and a cover that covers the oscillating element and at least part of the extension segment. [2] The oscillating device according to claim 1, wherein a space is provided between the cover and a section of the oscillating element and a section of the extension segment, a degree of displacement of the section of the oscillating element and the section of the extension segment resulting from oscillation of the oscillating element is greater than a predetermined value, and the cover is held at a section whose degree of displacement resulting from oscillation of the oscillating element is less than or equal to the predetermined value. [3] The oscillating device according to claim 2, which further comprises the following feature: an intermediate component that is located in a space between the cover and is provided to the vibration element or between the cover and the extension segment, wherein a Young modulus of the intermediate element is 1 GPa or less. [4] The oscillating device according to claim 2, which further comprises the following feature: an intermediate component that is located in a space between the cover and is provided to the vibration element or between the cover and the extension segment, wherein a dimension of the intermediate member in an extension direction of the extension segment is 0.4 mm or less. [5] The oscillating device according to claim 2, which further comprises the following feature: an intermediate component that is located in a space between the cover and is provided to the vibrating element or between the cover and the extension segment, wherein a contact surface of the intermediate member with the cover is 60 mm 2 or less. [6] The oscillating device according to claim 2, wherein the cover is inclined in a direction from the light transmission element towards a fixed section of the cover; and a position of the fixed section of the cover is lower than a position of the light transmission element in an axial direction of the tubular body. [7] The oscillating device according to claim 2 or 6, wherein irregularities are formed on a surface of the cover facing the oscillating element or the extension segment, and a guide section that releases foreign matter is provided for the cover. [8] The oscillating device according to claim 6 or 7, wherein a water-repellent or hydrophilic coating material is applied to a surface of the cover which faces the oscillating element or the extension segment. [9] The oscillating device according to any one of claims 1 to 8, wherein the cover is held on a part of a machine in or on which the oscillating device is installed. [10] The vibrating device according to any one of claims 1 to 8, wherein the cover is part of a machine in or on which the vibrating device is installed. [11] The oscillating device according to any one of claims 1 to 10, wherein the cover is attached to the oscillating device mechanically or by means of an adhesive. [12] The oscillating device according to claim 1, wherein the cover is in contact with at least a section of the oscillating element and a section of the extension segment, a degree of displacement of the section of the oscillating element and the section of the extension segment that occurs due to an oscillation of the oscillating element is greater than a predetermined value and the cover is made of a material with a Young modulus of 1 GPa or less. [13] An image-generating device having the following features: the oscillating device according to any one of claims 1 to 12; and an image generating device arranged such that the light transmission element is positioned in a viewing direction of the image generating device.

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